FORM 6 - K



                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                        Report of Foreign Private Issuer
                    Pursuant to Rule 13a - 16 or 15d - 16 of
                       the Securities Exchange Act of 1934


                               As of March 6, 2006



                                  TENARIS, S.A.
                 (Translation of Registrant's name into English)


                                  TENARIS, S.A.
                           46a, Avenue John F. Kennedy
                                L-1855 Luxembourg
                    (Address of principal executive offices)


     Indicate by check mark whether the registrant files or will file annual
reports under cover Form 20-F or 40-F.

                          Form 20-F x    Form 40-F
                                   ---            ---

     Indicate by check mark whether the registrant by furnishing the information
contained in this Form is also thereby furnishing the information to the
Commission pursuant to Rule 12G3-2(b) under the Securities Exchange Act of 1934.

                          Yes            No x
                             ---           ---


     If "Yes" is marked, indicate below the file number assigned to the
registrant in connection with Rule 12g3-2(b): 82-____.




The  attached  material  is  being  furnished  to the  Securities  and  Exchange
Commission  pursuant to Rule 13a-16 and Form 6-K under the  Securities  Exchange
Act of 1934, as amended.  This report contains Tenaris'  consolidated  condensed
interim financial statements as of September 30, 2005.
























                                  TENARIS S.A.







                                  CONSOLIDATED
                              FINANCIAL STATEMENTS




              For the years ended December 31, 2005, 2004 and 2003














46a, Avenue John F. Kennedy - 2nd Floor.
L - 1855 Luxembourg




Tenaris S.A. Consolidated financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------
CONSOLIDATED INCOME STATEMENTS


                                                                                                
                                                                                  Year ended December 31,
                                                                     --------------------------------------------------
(all amounts in thousands of U.S. dollars, unless           Notes         2005            2004              2003
otherwise stated)

Net sales                                                     1          6,736,197        4,136,063       3,179,652
Cost of sales                                                 2         (3,942,758)      (2,776,936)     (2,207,827)
                                                                     =================================================
Gross profit                                                             2,793,439        1,359,127         971,825
Selling, general and administrative expense                   3           (842,574)        (672,449)       (566,835)
Other operating income                                        5(i)          11,986          152,591           8,859
Other operating expense                                       5(ii)        (14,405)         (25,751)       (125,659)
                                                                     =================================================
Operating income                                                         1,948,446          813,518         288,190
Financial income (expense), net                               6           (109,738)           5,802         (29,420)
                                                                     =================================================
Income before equity in earnings of associated
companies and income tax                                                 1,838,708          819,320         258,770
Equity in earnings of associated companies                    7            117,377          206,037          27,585
                                                                     =================================================
Income before income tax                                                 1,956,085        1,025,357         286,355
Income tax                                                    8           (568,753)        (220,376)        (63,918)
                                                                     =================================================
Income for the year (1)                                                  1,387,332          804,981         222,437
                                                                     =================================================
Income for the year attributable to (1):
Equity holders of the Company                                            1,277,547          784,703         210,308
Minority interest                                                          109,785           20,278          12,129
                                                                     =================================================
                                                                         1,387,332          804,981         222,437
                                                                     =================================================


Earnings per share attributable to equity holders of the
Company (1)
Weighted average number of ordinary shares outstanding
(in thousands)                                                9          1,180,537        1,180,507       1,167,230
Earnings per share (U.S. dollars per share)                   9               1.08             0.66            0.18
Earnings per ADS (U.S. dollars per ADS)                       9              10.82             6.65            1.80


(1)  Prior to  December  31,  2004  minority  interest  was shown in the  income
     statement  before  net  income,  as  required  by  International  Financial
     Reporting  Standards  ("IFRS") in effect.  For years  beginning on or after
     January 1, 2005,  International  Accounting  Standards  ("IAS") 1 (revised)
     requires  that  income  for the year as shown on the income  statement  not
     exclude  minority  interest.  Earnings per share,  however,  continue to be
     calculated  on the basis of net  income  attributable  solely to the equity
     holders of the Company (see Section IV (a)).

The  accompanying  notes are an integral  part of these  consolidated  financial
statements.



                                       -1-



Tenaris S.A. Consolidated financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------

CONSOLIDATED BALANCE SHEETS
(all amounts in thousands of U.S. dollars)


                                                                                                   
                                                                At December 31,              At December 31,
                                                                      2005                       2004
                                                              -----------------------    ------------------------
                                                       Notes
ASSETS
Non-current assets
  Property, plant and equipment, net                    10          2,230,038                2,164,601
  Intangible assets, net                                11            159,099                   49,211
  Investments in associated companies                   12            257,234                   99,451
  Other investments                                     13             25,647                   24,395
  Deferred tax assets                                   21            194,874                  161,173
  Receivables                                           14             65,852  2,932,744       151,365  2,650,196
                                                                  ------------              -----------
Current assets
  Inventories                                           15          1,376,113                1,269,470
  Receivables and prepayments                           16            143,282                  279,450
  Current tax assets                                    17            102,455                   94,996
  Trade receivables                                     18          1,324,171                  936,931
  Other investments                                     19(i)         119,907                  119,666
  Cash and cash equivalents                             19(ii)        707,356  3,773,284       311,579  3,012,092
                                                                  -----------------------   ----------------------
Total assets                                                                   6,706,028                5,662,288
                                                                              ===========              ===========

EQUITY AND LIABILITIES (Section IV. (a))
Capital and reserves attributable to the Company's
equity holders
  Share capital                                                     1,180,537                1,180,537
  Legal reserves                                                      118,054                  118,054
  Share premium                                                       609,733                  609,733
  Other distributable reserve                                               -                       82
  Currency translation adjustments                                    (59,743)                 (30,020)
  Other reserves                                                        2,718                        -
  Retained earnings                                                 1,656,503  3,507,802       617,538  2,495,924
                                                                  ------------             ------------

Minority interest                                                                268,071                  165,271
                                                                              -----------              -----------
Total equity                                                                   3,775,873                2,661,195
                                                                              -----------              -----------

LIABILITIES
Non-current liabilities
  Borrowings                                            20            678,112                  420,751
  Deferred tax liabilities                              21            353,395                  371,975
  Other liabilities                                     22(i)         154,378                  172,442
  Provisions                                            23(ii)         43,964                   31,776
  Trade payables                                                        1,205  1,231,054         4,303  1,001,247
                                                                  ------------             ------------

Current liabilities
  Borrowings                                            20            332,180                  838,591
  Current tax liabilities                                             452,534                  222,735
  Other liabilities                                     22(ii)        138,875                  194,945
  Provisions                                            24(ii)         36,945                   42,636
  Customer advances                                                   113,243                  108,847
  Trade payables                                                      625,324  1,699,101       592,092  1,999,846
                                                                  -----------------------  -----------------------

Total liabilities                                                              2,930,155                3,001,093
                                                                             -----------              -----------

Total equity and liabilities                                                   6,706,028                5,662,288
                                                                             ===========              ===========


Contingencies,  commitments and  restrictions to the distribution of profits are
disclosed  in Note 26.  The  accompanying  notes are an  integral  part of these
consolidated financial statements.



                                       -2-




Tenaris S.A. Consolidated financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------
CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY

(all amounts in thousands of U.S. dollars)


                                                                                              
-----------------------------------------------------------------------------------------------------
                                           Attributable to equity holders of the Company
                              -----------------------------------------------------------------------
                                                                                                             Minority
                                                                                                             Interest
                                                                Other         Currency             Retained   (see
                                Share       Legal    Share   Distributable   translation  Other    Earnings   Section
                               Capital    Reserves  Premium   Reserve (*)    adjustment  Reserves    (*)      IV.(a))     Total
                              ---------------------------------------------------------------------------------------------------

Balance at January 1, 2005    1,180,537   118,054   609,733         82        (30,020)         -    617,538   165,271  2,661,195
Effect of adopting IFRS 3
(see Section IV.)                     -        -          -          -          -              -    110,775         -    110,775

                              ---------------------------------------------------------------------------------------------------
Adjusted balance at
January 1, 2005               1,180,537   118,054   609,733         82        (30,020)         -    728,313   165,271  2,771,970
Currency translation
 differences                          -         -         -          -        (29,723)         -          -     7,180    (22,543)
Increase in equity reserves in
 Ternium (see Note 28)                                                                     2,718                           2,718
Acquisition of minority
 interest                             -         -         -          -              -          -          -       153        153
Dividends paid in cash                -         -         -        (82)             -          -   (349,357)  (14,318)  (363,757)
Income for the year                   -         -         -          -              -          -  1,277,547   109,785  1,387,332

                              ---------------------------------------------------------------------------------------------------
Balance at December 31, 2005  1,180,537   118,054   609,733          -        (59,743)     2,718  1,656,503   268,071  3,775,873
                              ---------------------------------------------------------------------------------------------------


(*) The  Distributable  Reserve and Retained  Earnings  calculated  according to
Luxembourg Law are disclosed in Note 26 (v).

The  accompanying  notes are an integral  part of these  consolidated  financial
statements.



                                       -3-



Tenaris S.A. Consolidated financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------
CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (CONT'D.)

(all amounts in thousands of U.S. dollars)



                                                                                                  
                                -----------------------------------------------------------------------------------------------
                                                  Attributable to equity holders of the Company
                                -----------------------------------------------------------------------   Minority
                                                                  Other         Currency                  Interest
                                  Share     Legal     Share    Distributable   translation   Retained   (see Section
                                 Capital  Reserves   Premium     Reserve       adjustments   Earnings     IV. (a))        Total
                                ---------------------------------------------------------------------------------------------------

Balance at January 1, 2004    1,180,288   118,029   609,269     96,555        (34,194)       (128,667)      119,984    1,961,264

Currency translation
 differences                          -         -         -          -          4,174               -         9,478       13,652
Capital Increase and
 acquisition of
 minority interest                  249        25       464         82              -               -        20,457       21,277
Dividends paid in cash                -         -         -    (96,555)             -         (38,498)       (4,926)    (139,979)
Income for the year                   -         -         -          -              -         784,703        20,278      804,981
                                ---------------------------------------------------------------------------------------------------
Balance at December 31, 2004  1,180,537   118,054   609,733         82        (30,020)        617,538       165,271    2,661,195
                                ---------------------------------------------------------------------------------------------------


                                -----------------------------------------------------------------------------------------------
                                                  Attributable to equity holders of the Company
                                -----------------------------------------------------------------------    Minority
                                                                   Other        Currency                   Interest
                                  Share      Legal      Share   Distributable translation    Retained    (see Section
                                 Capital    Reserves   Premium    Reserve      adjustments   Earnings      IV. (a))       Total
                                ---------------------------------------------------------------------------------------------------

Balance at January 1, 2003    1,160,701   116,070   587,493    206,744        (34,503)       (342,451)      186,783    1,880,837

Currency translation
 differences                          -         -         -          -            309               -        16,738       17,047
Capital Increase, exchange
 transaction and acquisition
 of minority interest            19,587     1,959    21,776      4,813              -           3,476       (81,602)     (29,991)
Dividends paid                        -         -         -   (115,002)             -               -       (14,064)    (129,066)
Income for the year                   -         -         -          -              -         210,308        12,129      222,437
                                ---------------------------------------------------------------------------------------------------
Balance at December 31, 2003  1,180,288   118,029   609,269     96,555        (34,194)       (128,667)      119,984    1,961,264
                                ---------------------------------------------------------------------------------------------------


The  accompanying  notes are an integral  part of these  consolidated  financial
statements.



                                       -4-



Tenaris S.A. Consolidated financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------
CONSOLIDATED CASH FLOW STATEMENTS



                                                                                                   
                                                                                       Year ended December 31,
                                                                                 -----------------------------------
(all amounts in thousands of U.S. dollars)                                            2005        2004      2003
                                                                                 -----------------------------------
Cash flows from operating activities
Income for the year                                                               1,387,332     804,981   222,437
Adjustments for:
 Depreciation and amortization                                           10&11      214,227     208,119   199,799
 Income tax accruals less payments                                       30(ii)     149,487      44,659  (138,570)
 Equity in earnings of associated companies                                7       (117,377)   (206,037)  (27,585)
 Interest accruals less payments, net                                    30(iii)      1,919      16,973    (3,032)
                                                                           26
Power plant impairment                                                  (iv)(d)           -      11,705         -
Changes in provisions                                                     23&24       6,497      11,455       (13)
Result from disposition of investments in associated companies                            -           -    (1,018)
Proceeds from Fintecna arbitration award net of BHP settlement            26(i)      66,594    (126,126)  114,182
Changes in working capital (1)                                            30(i)    (433,939)   (621,187) (107,156)
Other, including currency translation adjustment                                     20,583     (46,254)   16,592
                                                                                 -----------------------------------
Net cash provided by operating activities                                         1,295,323      98,288   275,636
                                                                                 -----------------------------------

Cash flows from investing activities
Capital expenditures                                                      10&11    (284,474)   (183,312) (162,624)
Acquisitions of subsidiaries                                               28(a)    (48,292)    (97,595)  (65,283)
Convertible loan to associated companies                                   28(d)    (40,358)          -   (31,128)
Proceeds from disposal of property, plant and equipment and intangible
 assets                                                                               9,995      12,054     5,965
Proceeds from sales of investments in associated companies                                -           -     1,124
Dividends and distributions received from associated companies              12       59,127      48,598         -
Changes in restricted bank deposits                                                  11,452     (13,500)        -
Investments in short term securities                                               (119,907)          -         -
Reimbursement from trust funds                                                      119,666      20,359         -
Acquisitions of minority interest                                                         -           -      (299)
                                                                                 -----------------------------------
Net cash used in investing activities                                              (292,791)   (213,396) (252,245)
                                                                                 -----------------------------------

Cash flows from financing activities
Dividends paid                                                                     (349,439)   (135,053) (115,002)
Dividends paid to minority interest in subsidiaries                                 (14,318)        (31)  (14,064)
Proceeds from borrowings                                                          1,222,861     632,095   552,446
Repayments of borrowings                                                         (1,463,233)   (326,453) (506,717)
                                                                                 -----------------------------------
Net cash (used in)  provided by financing activities                               (604,129)    170,558   (83,337)
                                                                                 -----------------------------------
Increase (decrease) in cash and cash equivalents                                    398,403      55,450   (59,946)

Movement in cash and cash equivalents
At beginning of the year                                                            293,824     238,030   294,887
Effect of exchange rate changes                                                     (11,636)        344     3,089
Increase in cash and cash equivalents                                               398,403      55,450   (59,946)
                                                                                 -----------------------------------
At December 31,                                                                     680,591     293,824   238,030
                                                                                 -----------------------------------
Non-cash financing activities:
Fair value adjustment of minority interest acquired                                       -           -      (925)
Common stock issued in acquisition of minority interest                                   -         820    51,611
Conversion of debt to equity in subsidiaries                                              -      13,072         -




(1)  In 2004,  includes USD55.1 million  corresponding to the first  installment
     paid in connection with the final settlement of BHP claim

The  accompanying  notes are an integral  part of these  consolidated  financial
statements.



                                       -5-



Tenaris S.A. Consolidated financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------
INDEX TO THE NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS


                                                             
I.    GENERAL INFORMATION                        V.    OTHER NOTES TO THE CONSOLIDATED
                                                       FINANCIAL STATEMENTS

                                                 1     Segment information

II.   ACCOUNTING POLICIES ("AP")                 2     Cost of sales

A     Basis of presentation                      3     Selling, general and administrative expenses

B     Group accounting                           4     Labor costs (included in Cost of sales and
                                                       Selling, general and administrative expenses)

C     Segment information                        5     Other operating items

D     Foreign currency translation               6     Financial income (expenses), net

E     Property, plant and equipment              7     Equity in earnings of associated companies

F     Impairment of non financial assets         8     Income tax

G     Intangible assets                          9     Earnings and dividends per share

H     Other investments                          10    Property, plant and equipment, net

I     Inventories                                11    Intangible assets, net

J     Trade receivables                          12    Investments in associated companies

K     Cash and cash equivalents                  13    Other investments non current

L     Shareholders' Equity                       14    Receivables non current

M     Borrowings                                 15    Inventories

N     Income taxes - Current and Deferred        16    Receivables and prepayments

O     Employee - related liabilities             17    Current tax assets

P     Employees' statutory profit sharing        18    Trade receivables

Q     Provisions and other liabilities           19    Cash and cash equivalents, and Other investments

R     Revenue recognition                        20    Borrowings

S     Cost of sales and sales expenses           21    Deferred income tax

T     Earnings per share                         22    Other liabilities

U     Derivative financial instruments           23    Non-current allowances and provisions

                                                 24    Current allowances and provisions

III.  FINANCIAL RISK MANAGEMENT                  25    Derivative financial instruments

                                                 26    Contingencies, commitments and restrictions on the
                                                       distribution of profits

IV.   IMPACT OF NEW ACCOUNTING                   27    Ordinary shares and share premium
      PRONOUNCEMENTS
                                                 28    Business and other acquisitions

                                                 29    Related party transactions

                                                 30    Cash flow disclosures

                                                 31    Principal subsidiaries


                                       -6-



Tenaris S.A. Consolidated financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------
I. GENERAL INFORMATION

Tenaris S.A. (the "Company" or  "Tenaris"),  a Luxembourg  corporation  (societe
anonyme  holding),  was  incorporated on December 17, 2001, as a holding company
for investments in steel pipe  manufacturing  and distributing  operations.  The
Company holds, either directly or indirectly,  controlling  interests in various
subsidiaries.  A list of the Company's  investment  holdings is included in Note
31.

Tenaris shares are listed on the New York,  Buenos Aires,  Milan and Mexico City
Stock Exchanges.

These consolidated  financial  statements were approved for issue by the Tenaris
Board of Directors on March 1, 2006.


II. ACCOUNTING POLICIES

A    Basis of presentation

The Consolidated  Financial Statements of Tenaris and its subsidiaries have been
prepared  in  accordance  with  International   Financial   Reporting  Standards
("IFRS").  The consolidated  financial  statements are presented in thousands of
U.S. dollars ("$").

At December 31, 2005, 2004 and 2003, the financial statements of Tenaris and its
subsidiaries have been consolidated.

Certain  comparative  amounts  have been  reclassified  to conform to changes in
presentation in the current year.

The  preparation of  consolidated  financial  statements in conformity with IFRS
requires  management to make certain  accounting  estimates and assumptions that
might affect the reported  amounts of assets and  liabilities and the disclosure
of  contingent  assets and  liabilities  at the  balance  sheet  dates,  and the
reported  amounts of revenues and expenses  during the reporting  years.  Actual
results may differ from these estimates.

B    Group accounting

(1)  Subsidiary companies

Subsidiary companies are entities which are controlled by Tenaris as a result of
its  ownership of more than 50% of the voting rights or its ability to otherwise
govern  an  entity's   financial  and  operating   policies.   Subsidiaries  are
consolidated  from the date on which control is exercised by the Company and are
no longer consolidated from the date that the Company ceases to have control.

The Company has applied  IFRS 3 for all  business  combinations  after March 31,
2004.

The purchase  method of  accounting  is used to account for the  acquisition  of
subsidiaries by the Company.  The cost of an acquisition is measured as the fair
value of the assets given, equity instruments issued and liabilities incurred or
assumed at the date of  acquisition,  plus costs  directly  attributable  to the
acquisition.   Identifiable  assets  acquired  and  liabilities  and  contingent
liabilities  assumed in a business  combination are measured  initially at their
fair values at the acquisition  date. The excess of the cost of acquisition over
the fair value of the Company's share of the identifiable net assets acquired is
recorded as goodwill.  If the cost of acquisition is less than the fair value of
the net assets of the subsidiary acquired, the difference is recognized directly
in the income statement.

Material  intercompany  transactions and balances  between Tenaris  subsidiaries
have been  eliminated in  consolidation.  However,  the fact that the functional
currency of some subsidiaries is their respective local currency, generates some
financial  gains  (losses)  arising  from  intercompany  transactions,  that are
included in the consolidated  income statement under Financial income (expense),
net.



See Note 31 for the list of the consolidated subsidiaries.



                                       -7-



Tenaris S.A. Consolidated financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------

(2)  Associated companies

Investments  in  associated  companies are accounted for by the equity method of
accounting and initially recognized at cost.  Associated companies are companies
in which  Tenaris  owns  between 20% and 50% of the voting  rights or over which
Tenaris has significant influence, but does not have control. Unrealized results
on transactions  between Tenaris and its associated  companies are eliminated to
the extent of Tenaris' interest in the associated  companies.  Unrealized losses
are  also  eliminated  but  considered  an  impairment  indicator  of the  asset
transferred. Accounting policies of associated companies have been changed where
necessary to ensure  consistency with the policies  adopted by the Company.  The
Company's  pro-rata  share of earnings in  associated  companies  is recorded in
Equity in earnings of profit of associated  companies.  The  Company's  pro-rata
share of changes in other reserves is recognized in reserves in the Statement of
Changes in Equity.

The Company's  investment  in Ternium S.A.  ("Ternium")  has been  accounted for
under the equity method, as Tenaris has significant  influence as defined in IAS
28,  Investments  in  Associates.  At December 31,  2005,  Tenaris held 15.0% of
Ternium's  common  stock.  The  Company's  investment  in  Ternium is carried at
historical  cost plus  proportional  ownership of  Ternium's  earnings and other
shareholders' equity accounts.  Because the exchange of its holdings in Amazonia
and Ylopa for shares in  Ternium  was  considered  to be a  transaction  between
companies under common control of San Faustin N.V., Tenaris recorded its initial
ownership  interest  in Ternium at $229.7  million,  the  carrying  value of the
investments   exchanged.   This  value  is  $22.6  million  less  than  Tenaris'
proportional  ownership of  Ternium's  shareholders'  equity at the  transaction
date.  As a result of this  treatment,  Tenaris'  investment in Ternium will not
reflect its  proportional  ownership of Ternium's net equity  position.  Ternium
carried  out an  initial  public  offering  of its shares on  February  1, 2006,
listing its shares on the New York Stock Exchange.

See Note 12 for a list of principal associated companies.

C    Segment information

The Company is organized around four major business segments:  Seamless,  Welded
and Other Metallic Products, Energy and Others. A business segment is a group of
assets and  operations  that are subject to risks and returns that are different
from those of other business segments.

The  secondary  reporting  format  is  based  on  geographical   segments.   For
geographical purposes,  Tenaris groups its operations into five segments:  South
America,  Europe,  North  America,  Middle  East  and  Africa,  and Far East and
Oceania.  Allocation  of net sales is based on the  geographic  location  of the
Company's  customers,  while  allocation of assets and capital  expenditures and
associated depreciation and amortization are based on the geographic location of
the assets.

D    Foreign Currency Translation

(1)  Functional currency

IAS 21(revised)  defines the functional  currency as the currency of the primary
economic environment in which an entity operates.

The functional  currency of Tenaris S.A. is the U.S. dollar.  The U.S. dollar is
the currency that best reflects the economic  substance of the underlying events
and circumstances  relevant to the Company's global operations.  Generally,  the
functional currency of Tenaris's  subsidiaries is the respective local currency.
The Company's Argentine operations,  however,  which consist of Siderca S.A.I.C.
("Siderca") and its Argentine  subsidiaries,  have determined  their  functional
currency to be the U.S. dollar, based on the following considerations:

     o    Sales are mainly negotiated,  denominated and settled in U.S. dollars.
          If  priced  in a  currency  other  than the  U.S.  dollar,  the  price
          considers  exposure to fluctuation in the rate of exchange rate versus
          the U.S. dollar;
     o    Prices of critical raw  materials and inputs are priced and settled in
          U.S. dollars;
     o    The exchange rate of the currency of Argentina has long-been  affected
          by recurring and severe economic crises;
     o    Net  financial   assets  and   liabilities  are  mainly  received  and
          maintained in U.S. dollars.



                                       -8-



Tenaris S.A. Consolidated financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------

In  addition to Siderca,  the  Company's  commercial  network  subsidiaries  and
intermediate  holding  subsidiaries also use the U.S. dollar as their functional
currency,  reflecting  the  transaction  environment  and  cash  flow  of  these
operations.

(2)  Translation  of  financial   information  in  currencies   other  than  the
     functional currency

Results of operations for subsidiaries  whose functional  currencies are not the
U.S. dollar are translated into U.S.  dollars at the average  exchange rates for
each  quarter  of the  year.  Balance  sheet  positions  are  translated  at the
end-of-year exchange rates.  Translation differences are recognized in equity as
currency translation adjustments. In the case of a sale or other disposal of any
such subsidiary,  any accumulated  translation difference would be recognized in
income as a gain or loss from the sale.

(3)  Transactions in currencies other than the functional currency

Transactions in currencies other than the functional  currency are accounted for
at the exchange  rates  prevailing  at the date of the  transactions.  Gains and
losses   resulting   from  the  settlement  of  such   transactions,   including
intercompany  transactions,  and from the  translation  of  monetary  assets and
liabilities  denominated in currencies other than the functional  currency,  are
recorded as gains and losses from  foreign  exchange  and  included in Financial
income (expense), net in the income statement.

E    Property, plant and equipment

Property,  plant and equipment  are  recognized  at  historical  acquisition  or
construction cost less accumulated depreciation and impairment losses. Property,
Plant and  Equipment  acquired  through  acquisitions  accounted for as business
combinations  have been valued  initially at the fair market value of the assets
acquired.

Major overhaul and rebuilding  expenditures  are capitalized as property,  plant
and equipment only when the  investment  enhances the condition of assets beyond
its original condition.

Ordinary maintenance  expenses on manufacturing  properties are recorded as cost
of products sold in the year in which they are incurred.

Borrowing  costs that are  attributable  to the  acquisition or  construction of
certain  capital  assets are  capitalized  as part of the cost of the asset,  in
accordance  with IAS 23,  Borrowing  Costs.  Capital assets for which  borrowing
costs may be capitalized are those that require a substantial  period of time to
prepare for their intended use.

Depreciation is calculated using the  straight-line  method to amortize the cost
of each asset to its residual value over its estimated useful life, as follows:

        Buildings and improvements                               30-50 years
        Plant and production equipment                           10-20 years
        Vehicles, furniture and fixtures, and other equipment     4-10 years

The residual  values and useful lives of  significant  plant and  equipment  are
reviewed,  and adjusted if appropriate,  at each year-end date. Any charges from
such reviews are included in Cost of sales in the income statement.

Estimating  useful  lives for  depreciation  is  particularly  difficult  as the
service  lives of  assets  are also  impacted  by  maintenance  and  changes  in
technology,  and the Company's ability to adapt technological  innovation to the
existing asset base. As a result, management considers estimation of asset lived
as a critical  accounting  estimate.  Management's  reestimation of asset useful
lives did not materially affect depreciation expense for 2005.

Gains and losses on disposals are  determined by comparing net proceeds with the
carrying amount of assets. These are included in Other operating income or Other
operating expense in the income statement.



                                       -9-



Tenaris S.A. Consolidated financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------

F    Impairment of non financial assets

Events  and  circumstances  may  potentially  affect the  recoverability  of the
carrying  value of tangible and  intangible  assets,  including  investments  in
associated and other companies. The carrying value of other non financial assets
is  evaluated  whenever  events or changes in  circumstances  indicate  that the
carrying  amounts may not be  recoverable.  An impairment loss is recognized for
the amount by which the assets's carrying amount exceeds its recoverable amount.
The recoverable amount is the higher of an asset's fair value less costs to sell
and value in use.  Assets  other  than  goodwill  that have  been  impaired  are
reviewed for possible reversal of the impairment at each reporting date.

Goodwill  is  tested  for  impairment  on an  annual  basis.  Assessment  of the
recoverability  of the carrying value of goodwill and other non financial assets
require a significant judgment.  The Company evaluates goodwill allocated to the
operating  units for  impairment on an annual basis in  accordance  with IAS 36,
Impairment of Assets (see AP G).

Although management believes its estimates and projections are appropriate based
on currently available information, the actual operating performance of an asset
or group of assets  which has been tested for  impairment  may be  significantly
different  from current  expectations.  In such an event,  the carrying value of
goodwill,  investments  in  associates  and other  non-financial  assets  may be
different from amounts currently recorded and materially affect asset values and
results of operations.

G    Intangible assets

(1)  Goodwill

Goodwill  represents the excess of the  acquisition  cost over the fair value of
the Company's share of net assets acquired as part of business combinations.  In
accordance  with IFRS 3,  beginning  January 1, 2005,  goodwill is considered to
have  an  indefinite  life  and  is not  amortized,  but is  subject  to  annual
impairment  testing.  In the event of impairment,  impairment losses on goodwill
are not reversed.  No impairment losses related to goodwill were recorded by the
Company during the three years covered by these financial  statements.  Goodwill
is included in `Intangible assets, net' on the balance sheet.

Gains and losses on the disposal of a business  include the  carrying  amount of
any  goodwill  related to the  business  being sold.  Goodwill is  allocated  to
cash-generating  units for the purpose of impairment testing.  The allocation is
made to those  cash-generating units or groups of cash-generating units expected
to benefit from the business  combination  which  generated  the goodwill  being
tested.

Negative  goodwill  represents an excess of the fair value of  identifiable  net
assets acquired in a business combination over the cost of the acquisition. IFRS
3 requires  negative  goodwill  to be  recognized  immediately  as a gain in the
income statement.

(2)  Information systems projects

Generally,  costs  associated with developing or maintaining  computer  software
programs are  recognized  as an expense as  incurred.  However,  costs  directly
related  to the  development,  acquisition  and  implementation  of  information
systems are recognized as intangible assets if it is probable they have economic
benefits exceeding beyond one year.

Information  systems  projects  recognized  as assets  are  amortized  using the
straight-line method over their useful lives, not exceeding a period of 3 years.
Amortization  charges  are  classified  as Selling,  general and  administrative
expenses in the income statement.

(3)      Licenses and patents

Expenditures on purchased patents, trademarks,  technology transfer and licenses
are  capitalized  and  amortized  using  the  straight-line  method  over  their
estimated useful lives.



                                       -10-



Tenaris S.A. Consolidated financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------

(4)  Research and development

Research expenditures are recognized as expenses as incurred.  Development costs
are recorded as cost of sales in the income  statement as incurred  because they
do not  fulfill  the  criteria  for  capitalization.  Research  and  development
expenditures  for the years ended 2005,  2004 and 2003 totaled $34.7,  $26.3 and
$21.9 million, respectively.

H    Other Investments

Other investments consist primarily of investments in financial debt instruments
and equity  investments where the Company holds less than 20% of the outstanding
equity and does not exert significant influence.

IAS 39 (revised),  "Financial  Instruments:  Recognition and Measurement"  ("IAS
39"), with effect as of January 1, 2005, requires that financial  investments be
classified  depending  on the  intent  for  the  investment.  IAS  39  (revised)
specifies four  categories:  financial assets held at "fair value through profit
or  loss",   "held-to-maturity   investments",   "loans  and   receivables"  and
"available-for-sale".  Investments that do not fulfill the specific requirements
of  IAS 39 for  financial  assets  at  "fair  value  through  profit  or  loss",
"held-to-maturity   investments"  or  "loans  and  receivables"  categories  are
included  in  the  residual  "available-for-sale"  category.  All  of  Tenaris's
investments are classified as financial  assets "at fair value through profit or
loss".  As  explained  in  section  IV.,  the  Company  applied  the  transition
provisions of IAS 39 and  designated as "financial  assets carried at fair value
through  profit or loss" the  investments  that were  previously  recognized  as
"available-for-sale".

Purchases  and sales of financial  investments  are  recognized  as of the trade
date, which is the date that Tenaris commits to purchase or sell the investment,
and  which is not  significantly  different  from the  actual  settlement  date.
Subsequent  to  their  acquisition,  the  change  in  fair  value  of  financial
investments  designated as held at fair value through  profit or loss is charged
to financial income (expense) in the income statement.

Income from financial  investments is recognized in Financial income  (expense),
net  in the  income  statement.  Interest  receivable  on  investments  in  debt
securities is calculated  using the effective  interest  method.  Dividends from
investments in equity  instruments  are recognized in the income  statement when
the Company's right to receive payments is established.

The fair values of quoted  investments  are based on current bid prices.  If the
market  for a  financial  investment  is not  active or the  securities  are not
listed, the Company estimates fair value by using standard valuation techniques.

I    Inventories

Inventories  are  stated at the  lower of cost  (calculated  principally  on the
first-in-first-out  "FIFO" method) and net realizable value as a whole. The cost
of finished  goods and goods in process is  comprised of raw  materials,  direct
labor, other direct costs and related production  overhead costs. Net realizable
value is  estimated  collectively  for  inventories  as the  sales  price in the
ordinary course of business,  less any costs of completion and selling expenses.
Goods in transit at year end are valued at supplier invoice cost.

For purposes of determining  net realizable  value,  the Company  establishes an
allowance  for  obsolete or  slow-moving  inventory  related to finished  goods,
supplies  and spare parts.  For slow moving or obsolete  finished  products,  an
allowance is established for based on management's analysis of product aging. An
allowance for  slow-moving  inventory of supplies and spare parts is established
based on  management's  analysis  of such items to be used as  intended  and the
consideration of potential obsolescence due to technological changes.

J    Trade receivables

Trade  receivables  are recognized  initially at original  invoice  amount.  The
Company  analyzes its trade  accounts  receivable  on a regular  basis and, when
aware of a specific client's  difficulty or inability to meet its obligations to
Tenaris,  impairs  any  amounts  due by means of a charge  to an  allowance  for
doubtful  accounts   receivable.   Additionally,   this  allowance  is  adjusted
periodically based on the aging of receivables.



                                      -11-



Tenaris S.A. Consolidated financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------

K    Cash and cash equivalents

Cash and cash  equivalents  are  comprised  of cash in banks,  short-term  money
market funds and highly  liquid  short-term  securities  with a maturity of less
than 90 days at date of purchase.  Assets recorded in cash and cash  equivalents
are carried at fair market value, or at historical cost which  approximates fair
market value.

For the  purposes  of the cash  flow  statement,  cash and cash  equivalents  is
comprised of cash,  bank accounts and short-term  highly liquid  investments and
overdrafts.

On the balance  sheet,  bank  overdrafts  are included in  borrowings in current
liabilities.

L    Shareholder' Equity

(1)  Basis of presentation

The consolidated statement of changes in equity includes:
     o    The value of share  capital,  legal  reserve,  share premium and other
          distributable reserve calculated in accordance with Luxembourg Law;
     o    The currency  translation  adjustments,  retained  earnings,  minority
          interest and other reserves calculated in accordance with IFRS;

(2)  Share Capital

Ordinary shares are classified as equity.

(3)  Dividends Paid by Tenaris to Shareholders

Dividends payable are recorded in Tenaris'  financial  statements in the year in
which they are approved by the Company's shareholders, or when interim dividends
are  approved by the Board of Directors  in  accordance  with the by-laws of the
Company.

Dividends  may be paid  by  Tenaris  to the  extent  that  it has  distributable
retained  earnings,  calculated in accordance  with Luxembourg law. As a result,
retained earnings included in the consolidated  financial  statements may not be
wholly distributable. See Note 26 (v).


M    Borrowings

Borrowings are recognized initially for an amount equal to the proceeds received
net of  transaction  costs.  In  subsequent  years,  borrowings  are  stated  at
amortized  cost.  Any difference  between net proceeds and  redemption  value is
recognized as interest  expense within  Financial income (expense) in the income
statement over the expected tenor of the borrowings.

N    Income Taxes - Current and Deferred

Under  present  Luxembourg  law,  the  Company  is not  subject  to income  tax,
withholding  tax on dividends paid to  shareholders or capital gains tax payable
in  Luxembourg  as  long as the  Company  maintains  its  status  as a  "Holding
Billionaire Company".

The  current  income  tax charge is  calculated  on the basis of the tax laws in
effect in the countries  where the Company's  subsidiaries  operate and generate
taxable income. Management periodically evaluates positions taken in tax returns
with respect to situations in which  applicable  tax  regulations  is subject to
interpretation and establishes provisions when appropriate.

Deferred income taxes are calculated  applying the liability method on temporary
differences  arising  between the tax bases of assets and  liabilities and their
carrying  amounts  in  the  financial   statements.   The  principal   temporary
differences  arise  from the effect of  currency  translation  on fixed  assets,
depreciation  on property,  plant and equipment,  valuation of  inventories  and
provisions for pensions. Deferred tax assets are also recognized for net



                                      -12-



Tenaris S.A. Consolidated financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------

operating loss carry-forwards.  Deferred tax assets and liabilities are measured
at the tax rates that are expected to apply in the time period when the asset is
realized or the  liability  is expected to settled,  based on tax laws that have
been enacted or substantially enacted by the balance sheet date.

Deferred  tax assets are  recognized  to the extent it is  probable  that future
taxable income will be available to utilize those recognized deferred tax assets
against such income.

O    Employee-related liabilities

(a)  Employee severance indemnity

Employee  severance  indemnity  costs are assessed  annually using the projected
unit credit method. Employee severance indemnity obligations are measured at the
present  value  of the  estimated  future  cash  outflows,  based  on  actuarial
calculations  provided by  independent  advisors and in accordance  with current
legislation and labor contracts in effect in each respective  country.  The cost
of this obligation is charged to the income  statement over the expected service
lives of employees.

This  provision is primarily  related to the liability  accrued for employees at
Tenaris' Italian and Mexican subsidiaries.

(b)  Defined benefit pension obligations

Certain  officers  of the  Company  are  covered  by  defined  benefit  employee
retirement  plans  designed to provide  post-retirement,  termination  and other
benefits.

Post-retirement  costs are  assessed  using the  projected  unit credit  method.
Post-retirement  obligations  are measured at the present value of the estimated
future cash outflows,  based on actuarial  calculations  provided by independent
advisors.  Actuarial gains and losses are recognized over the average  remaining
service lives of employees.

Benefits  provided under the Company's  main plan are provided in U.S.  dollars,
and are calculated  based on seven-year  salary  averages.  Tenaris  accumulates
assets for the payment of benefits  expected to be disbursed by this plan in the
form of investments that are subject to time  limitations for redemption.  These
investments are neither part of a specific  pension plan nor are they segregated
from the  Company's  other  assets.  As a result,  this plan is considered to be
"unfunded" under IFRS definitions.

Certain other officers and former employees of one specific  Tenaris  subsidiary
are covered by a separate plan defined as "funded" under IFRS definitions.

(c)  Other compensation obligations

Employee  entitlements  to annual  leave and  long-service  leave are accrued as
earned.

Other  length  of  service  based  compensation  to  employees  in the  event of
dismissal or death is charged to income in the year in which it becomes payable.

P    Employee statutory profit sharing

Under Mexican law, the Company's Mexican  subsidiaries are required to pay their
employees an annual benefit calculated on a basis similar to that used for local
income tax purposes.  Employee  statutory profit sharing is calculated using the
liability  method,  and is recorded in Current other liabilities and Non-current
other  liabilities  on the balance sheet.  Because  Mexican  employee  statutory
profit  sharing is determined  on a basis  similar to that used for  determining
local income  taxes,  the Company  accounts for  temporary  differences  arising
between the statutory  calculation and reported expense as determined under IFRS
in a manner similar to the calculation of deferred income tax.



                                      -13-



Tenaris S.A. Consolidated financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------

Q    Provisions and other liabilities

Provisions are accrued to reflect  estimates of expenses  incurred based on best
available  information.  Estimates are based on information  available as of the
date of  preparation  of the  financial  statements.  If  Tenaris  expects to be
reimbursed for an accrued  expense,  as would be the case for an expense or loss
covered under an insurance contract,  and reimbursement is considered  virtually
certain, the expected reimbursement is recognized as a receivable.

Contingencies

Tenaris is subject to various  claims,  lawsuits  and other  legal  proceedings,
including customer claims, in which a third party is seeking payment for alleged
damages,   reimbursement  for  losses  or  indemnity.  The  Company's  potential
liability  with  respect to such claims,  lawsuits  and other legal  proceedings
cannot be estimated with certainty.  Management  periodically reviews the status
of each  significant  matter and assesses  potential  financial  exposure.  If a
potential loss from a claim or proceeding is considered  probable and the amount
can be  reasonably  estimated,  a  liability  is  recorded.  Accruals  for  loss
contingencies  reflect a reasonable  estimate of the losses to be incurred based
on  information  available to  management as of the date of  preparation  of the
financial  statements,  and take into consideration the Company's litigation and
settlement  strategies.  These  estimates  are  primarily  constructed  with the
assistance of legal counsel.  As the scope of liabilities become better defined,
there may be  changes  in the  estimates  of future  costs  which  could  have a
material  adverse effect on its results of operations,  financial  condition and
net worth.

R    Revenue recognition

The  Company's  products  and  services  are sold  based upon  purchase  orders,
contracts or upon other  persuasive  evidence of an arrangement  with customers,
including that the sales price is known or determinable and the arrangement does
not include  right of return or other similar  provisions  or other  significant
post-delivery  obligations.  Sales are  recognized  as revenue upon delivery and
when  collection is reasonably  assured.  Delivery is defined by the transfer of
risk  provision  of sales  contracts  and may include  delivery to a  customer's
storage facility located at one of the Company's subsidiaries.

Other revenues earned by Tenaris are recognized on the following bases:
     o    Interest income: on the effective yield basis.
     o    Dividend  income from  investments in other  companies:  when Tenaris'
          right to collect is established.

S    Cost of sales and sales expenses

Cost of sales and sales expenses are  recognized in the income  statement on the
accrual basis of accounting.

Shipping and handling  costs related to customer  sales are recorded in selling,
general and administrative expense in the income statement.

T    Earnings per share

Earnings per share are  calculated  by dividing the net income  attributable  to
equity  holders of the Company by the daily  weighted  average  number of common
shares outstanding during the year.

U    Derivative financial instruments

Accounting  for  derivative  financial  instruments  and hedging  activities  is
included within the section III, "Financial Risk Management", below.



                                      -14-



Tenaris S.A. Consolidated financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------
III. FINANCIAL RISK MANAGEMENT

The  multinational  nature of Tenaris'  operations  and customer base expose the
Company  to a variety  of risks,  including  the  effects  of changes in foreign
currency exchange rates and interest rates. To manage the volatility  related to
these exposures,  management evaluates exposures on a consolidated basis to take
advantage of logical exposure netting. For a portion of the remaining exposures,
the Company or its subsidiaries may enter into various  derivative  transactions
in  order  to  manage  potential  adverse  impacts  on the  Company's  financial
performance.  Such  derivative  transactions  are  executed in  accordance  with
internal policies in areas such as counterparty exposure and hedging practices.

A. Financial Risk Factors

(i)  Foreign exchange rate risk management

Tenaris  manufactures and sells its products in a number of countries throughout
the world and as a result is exposed to foreign  exchange rate risk. The purpose
of the Company's  foreign  currency hedging program is to reduce the risk caused
by short-term changes in exchange rates.

Tenaris  aims  to  neutralize   the  potential   negative   impact  of  currency
fluctuations  in the  value of other  currencies  with  respect  to the  dollar.
Because a number of subsidiaries have functional  currencies other than the U.S.
dollar,  the  results of hedging  activities  as  reported  IFRS may not reflect
management's assessment of its foreign exchange risk hedging program.

(ii) Interest rate risk management

The Company's  financing  strategy is to manage interest expense using a mixture
of fixed-rate  and  variable-rate  debt. To manage this risk in a cost efficient
manner,  Tenaris  enters into interest rate swaps in which it agrees to exchange
with the counterparty,  at specified intervals, the difference between fixed and
variable  interest  amounts  calculated by reference to an agreed-upon  notional
principal  amount.  Dalmine  and Tamsa have  entered  into  interest  rate swaps
related to long-term debt to partially hedge future interest  payments,  as well
as to convert borrowings from floating to fixed rates.

(iii) Concentration of credit risk

The Company's single largest customer is Petroleos Mexicanos, or Pemex. Sales to
Pemex, as a percentage of our total sales, amounted to approximately 8% in 2005.

The  Company's  credit  policies  related to sales of products  and services are
designed to identify customers with acceptable credit history,  and to allow the
Company  to  require  the use of credit  insurance,  letters of credit and other
instruments designed to minimize credit risk whenever deemed necessary.  Tenaris
maintains allowances for potential credit losses.

Derivative  counterparties  and cash  transactions  are  limited to high  credit
quality financial  institutions.  We have established strict counterparty credit
guidelines and normally enter into  transactions with investment grade financial
institutions.

(iv) Liquidity risk

Management  maintains  sufficient  cash  and  marketable  securities  or  credit
facilities to finance normal  operations.  The Company also has committed credit
facilities that adequately  backup its ability to close out market  positions if
needed.



                                      -15-



Tenaris S.A. Consolidated financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------
B. Fair value estimation

For purposes of estimating  the fair value of financial  assets and  liabilities
with  maturities of less than one year,  the market value was  considered.  Most
borrowings  are  comprised  of  variable  rate  debt or fixed  rate debt that in
general terms are comparable to market rates. As a result, the fair value of the
Company's  borrowings  approximates  its current  amounts  and is not  disclosed
separately.

C. Accounting for Derivative Financial Instruments and Hedging Activities

Derivative  financial  instruments are initially recognized in the balance sheet
at cost and subsequently  remeasured at fair value.  The Company  recognizes the
full  amount  related  to the  change  in fair  value  of  derivative  financial
instruments in "Financial income (expense), net" in the current year.

Tenaris does not hold or issue derivative financial  instruments for speculative
trading purposes.


IV. IMPACT OF NEW ACCOUNTING PRONOUNCEMENTS

Interpretations and amendments to published standards effective in 2005

IASB Project to Improve International Financial Reporting Standards

In December  2003, as a part of the project to improve  International  Financial
Reporting Standards, the IASB released revisions to certain standards including:
IAS 1,  "Presentation of Financial  Statements";  IAS 16,  "Property,  Plant and
Equipment"; IAS 39 (Amendment), "Transition and initial recognition of financial
assets and financial  liabilities";  and, IFRS 3, "Business  Combinations".  The
revised standards apply to annual periods beginning on or after January 1, 2005.
Adoption  of new or  revised  standards  has been  made in  accordance  with the
respective transition provisions.

The main impacts to the Company's consolidated financial statements are:

(a)  Presentation of minority interest

     IAS 1 (revised) requires  disclosure on the face of the income statement of
     an entity's  income or loss for the year and the  allocation of that amount
     between "income or loss  attributable to minority  interest" and "income or
     loss  attributable  to equity  holders of the Company".  Earnings per share
     continue to be calculated on the basis of net income attributable solely to
     the equity holders of the entity.  Also, for periods  beginning on or after
     January  1,  2005,  minority  interest  is  included  within  equity in the
     consolidated balance sheet and is no longer shown as a separate category in
     the  Liabilities  section of the balance sheet.  This change resulted in an
     increase of $165.3 million in the Company's  reported  equity at January 1,
     2005.

(b)  Reestimation of Plant and Equipment Useful Lives

     International  Accounting  Standard No. 16, Property,  Plant and Equipment,
     requires  for  periods  beginning  on or after  January 1,  2005,  that the
     residual  value and the useful life of fixed assets be reviewed at least at
     each  financial  year-end,   and,  if  expectations  differ  from  previous
     estimates,  for the  change  to be  treated  as a change  in an  accounting
     estimate.  The impact of the reestimation of useful lives for the Company's
     plant and equipment for the year ended December 31, 2005 was not material.



                                      -16-


Tenaris S.A. Consolidated financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------
Interpretations and amendments to published standards effective in 2005
(Cont'd.)

(c)  IAS 39 (revised), Financial Instruments: recognition and measurement

     In accordance  with the  transition  provisions  of IAS 39  (revised),  the
     Company designated certain investments in financial instruments  previously
     recognized as "available  for sale" as  "financial  assets  carried at fair
     value  through  profit or  loss".  Accordingly,  the  Company  changed  the
     classification of these financial  investments using the new designation in
     its financial  statements.  Financial  investments  are included in current
     assets unless  management  intends to dispose the  investment  more than 12
     months from the balance sheet date.

(d)  IFRS 3, Business Combinations: Goodwill and Negative Goodwill

     During 2004 International  Financial Reporting Standard (IFRS) 3, "Business
     Combinations" was issued, which was applied by the Company for all business
     combinations that occurred after March 31, 2004.

     As per this standard,  prior to January 1, 2005 goodwill was amortized on a
     straight line basis over its estimated useful life, not to exceed 15 years,
     and  tested  for  impairment  at  each  balance  sheet  date  in the  event
     indicators of impairment  were present.  As required by IFRS 3, the Company
     ceased  amortization of goodwill for periods  beginning on or after January
     1, 2005. In addition,  accumulated amortization as of December 31, 2004 has
     been netted against the cost of the goodwill.  For years ending on or after
     December  31,  2005  goodwill  is  required  to  be  tested   annually  for
     impairment,   as  well  as  when  there  are   indicators  of   impairment.
     Amortization of goodwill  expense  included in the years ended December 31,
     2004 and 2003 amounted to $9.4 million and $8.9 million respectively.

     Upon the  adoption  of IFRS 3,  which  must be  adopted  together  with the
     revised  IAS 38,  Intangible  Assets,  and IAS 36,  Impairment  of  Assets,
     previously  accumulated  negative  goodwill is required to be  derecognized
     through an adjustment to retained  earnings.  The derecognition of negative
     goodwill  in this manner  resulted in an increase of $110.8  million in the
     beginning balance of the Company's equity at January 1, 2005.  Amortization
     of negative goodwill in income amounted to $9.0 million and $8.9 million in
     the years ended December 31, 2004 and 2003, respectively.

Management  assessed  the  relevance  of  other  new  standards,  amendments  or
interpretations and concluded that they are not relevant to the Company.

Standards,  interpretations  and amendments to published  standards that are not
yet effective

Certain new standards, amendments and interpretations to existing standards have
been published that are mandatory for the Company's accounting periods beginning
on or after  January 1, 2006,  or later  periods  but which the  Company has not
early adopted as follows:

IAS  19,  Employee  Benefits:  Actuarial  Gains  and  Losses,  Group  Plans  and
Disclosures (Amendment)

On December 16, 2004,  the  International  Accounting  Standards  Board ("IASB")
issued International  Accounting Standard No. 19, "Employee Benefits:  Actuarial
Gains and Losses,  Group Plans and Disclosures  (Amendment)"  ("IAS 19"). IAS 19
gives  entities  the option of  recognizing  actuarial  gains and losses in full
during  the  period in which they  occur,  outside  of profit  and loss,  in the
statement of  recognized  income and  expense.  Previously,  entities  were only
permitted to recognize  actuarial gains and losses in profit and loss either (1)
in the  period  in which  they  occur or (2)  spread  over the  service  life of
employees.  As the  Company  does not  intend to change  the  accounting  policy
adopted for  recognition of actuarial  gains and losses and does not participate
in any multi  employer  plans,  adoption of this  amendment will only impact the
format and extent of disclosures in the financial statements. Tenaris will apply
this amendment from annual periods beginning January 1, 2006.



                                      -17-



Tenaris S.A. Consolidated  financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------

IAS 21, The Effects of Changes in Foreign  Exchange  Rates - Net  Investment  in
Foreign Operations

In December 2005, the IASB issued an amendment to IAS 21, The Effects of Changes
in Foreign Exchange Rates - Net Investment in Foreign Operations.  The amendment
finalizes proposals that were contained in Draft Technical Correction 1 Proposed
Amendments  to  IAS  21 Net  Investment  in a  Foreign  Operation  published  in
September  2005 and is  applicable  for  annual  periods  beginning  on or after
January 1, 2006.  The  Company's  management  has not yet assessed the impact of
this standard on its financial statements. o

IFRS 7, Financial Instruments:  Disclosure, and a complementary amendment to IAS
1, presentation of financial statements - Capital disclosure

IFRS  7  introduces  new  disclosures   about  financial   instruments  such  as
qualitative and quantitative  information  about exposures to risks arising from
financial instruments.  The Company will apply IFRS 7 and the amendment to IAS 1
for annual periods beginning on January 1, 2007.

Management  assessed  the  relevance  of  other  new  standards,  amendments  or
interpretations  not yet effective  and concluded  that they are not relevant to
the Company.

V. OTHER NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS
(In the  notes  all  amount  are  shown in  thousands  of U.S.  dollars,  unless
otherwise stated)

1    Segment information
Primary reporting format: business segments




                                                         Welded and
                                                           other
                                                          metallic
                                           Seamless       products       Energy       Others      Unallocated      Total
                                          ------------ --------------- ------------ ------------ -------------- ------------
                                                                                                
     Year ended December 31, 2005
     Net sales                              5,123,975         845,089      526,406      240,727              -    6,736,197
     Cost of sales                        (2,720,858)       (556,142)    (513,401)    (152,357)              -  (3,942,758)
                                          ------------ --------------- ------------ ------------ -------------- ------------
     Gross profit                           2,403,117         288,947       13,005       88,370              -    2,793,439

     Segment assets                         4,747,808         525,199      147,019    1,032,206        253,796    6,706,028
     Segment liabilities                    2,410,540         217,183      124,290      178,142              -    2,930,155

     Capital expenditures                     252,974          25,101        1,379        5,020              -      284,474
     Acquisition of property, plant and
     equipment and intangible assets
     due to business combination               67,980               -            .            -              -       67,980
     Depreciation and amortization            182,617          15,545        2,514       13,551              -      214,227

     Year ended December 31, 2004

     Net sales                              3,273,267         348,137      417,870       96,789              -
                                                                                                                  4,136,063
     Cost of sales                        (2,075,164)       (249,471)    (398,462)     (53,839)              -  (2,776,936)
                                          ------------ --------------- ------------ ------------ -------------- ------------
     Gross profit                           1,198,103          98,666       19,408       42,950              -
                                                                                                                  1,359,127

     Segment assets                         4,322,982         510,669      121,846      610,162         96,629
                                                                                                                  5,662,288
     Segment liabilities                    2,430,935         313,600      122,046      134,512              -
                                                                                                                  3,001,093

     Capital expenditures                     149,326          23,276        1,438        9,272              -
                                                                                                                    183,312

     Acquisition of property, plant and
     equipment and intangible assets
     due to business combination               73,846               -            -      117,251              -      191,097
     Depreciation and amortization            185,118          12,665        3,554        6,782              -
                                                                                                                    208,119



                                      -18-



Tenaris S.A. Consolidated  financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------





     Year ended December 31, 2003

     Net sales                              2,388,177         350,745      333,207      107,523              -    3,179,652
     Cost of sales                        (1,531,995)       (274,643)    (316,566)     (84,623)              -  (2,207,827)
                                          ------------ --------------- ------------ ------------ -------------- ------------
                                                                                                
     Gross profit                             856,182          76,102       16,641       22,900              -      971,825

     Segment assets                         3,534,575         408,498      105,629      217,846         43,000    4,309,548
     Segment liabilities                    1,959,274         252,993       91,982       44,035              -    2,348,284

     Capital expenditures                     129,405          24,245        5,380        3,594              -      162,624
     Acquisition of property, plant and
     equipment and intangible assets
     due to business combination               28,535               -            .        2,229              -       30,764
     Depreciation and amortization            180,855          10,896        3,706        4,342              -      199,799



Tenaris' main business segment is seamless pipes.

The  main  transactions   between   segments,   which  were  eliminated  in  the
consolidation, relate to sales of Energy to Seamless units for $107,393 in 2005,
$86,721 in 2004 and $62,755 in 2003. Other  transactions  include sales of scrap
and pipe  protectors  from the Others  segment to  Seamless  units for  $41,163,
$36,765 and $37,647 in 2005, 2004 and 2003, respectively.


                                      -19-



Tenaris S.A. Consolidated  financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------


Secondary reporting format: geographical segments




                                  South America    Europe       North     Middle East    Far East   Unallocated      Total
                                                               America     and Africa  and Oceania
                                  ---------------------------------------------------------------------------------------------
Year ended December 31, 2005
                                                                                                

Net sales                             1,823,735    1,570,207    1,708,126      959,020      675,109            -     6,736,197
Total assets                          2,092,857    1,502,634    2,213,075      289,363      354,303      253,796     6,706,028
Trade receivables                       358,859      265,378      310,153      255,379      134,402            -     1,324,171
Property, plant and equipment,
net                                     740,391      648,892      787,937        3,583       49,235            -     2,230,038
Capital expenditures                    109,180      104,665       64,274        1,498        4,857            -       284,474
Acquisition of property, plant
and equipment and intangible
assets due to business
combination                                   -       67,980            -            -            -            -        67,980
Depreciation and amortization            87,430       71,122       49,038          404        6,233            -       214,227

Year ended December 31, 2004

Net sales                               824,800    1,236,795    1,140,326      524,874      409,268            -     4,136,063
Total assets                          1,773,958    1,808,557    1,596,464      109,266      277,414       96,629     5,662,288
Trade receivables                       143,731      346,628      295,896       81,369       69,307            -       936,931
Property, plant and equipment,
net                                     728,468      635,939      737,507        4,645       58,042            -     2,164,601
Capital expenditures                     83,003       29,694       64,845        2,257        3,513            -       183,312
Acquisition of property, plant
and equipment and intangible
assets due to business
combination                             121,145       69,952            -            -            -            -       191,097
Depreciation and amortization            89,934       68,432       41,986           35        7,732            -       208,119

Year ended December 31, 2003

Net sales                               752,175      958,772      754,262      392,707      321,736            -     3,179,652
Total assets                          1,464,835    1,193,960    1,310,471       90,699      206,583       43,000     4,309,548
Trade receivables                       123,969      286,651      138,899       69,216       34,047            -       652,782
Property, plant and equipment,
net                                     624,542      557,637      716,952        2,376       58,807            -     1,960,314
Capital expenditures                     63,636       47,965       42,988          358        7,677            -       162,624
Acquisition of property, plant
and equipment and intangible
assets due to business
combination                              25,583        2,978        2,203                                      -        30,764
Depreciation and amortization           103,548       58,196       31,908           16        6,131            -       199,799



The South  American  segment  comprises  principally  Argentina,  Venezuela  and
Brazil.  The  European  segment  comprises  principally  Italy,  France,  United
Kingdom,  Germany,  Romania and Norway.  The North  American  segment  comprises
principally Mexico, USA and Canada. The Middle East and Africa segment comprises
principally Egypt, United Arab Emirates,  Saudi Arabia and Nigeria. The Far East
and Oceania segment  comprises  principally  China,  Japan,  Indonesia and South
Korea.


                                      -20-



Tenaris S.A. Consolidated  financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------


2    Cost of sales




                                                                 Year ended December 31,
                                                     -------------------------------------------------
                                                          2005            2004             2003

                                                                                     
        Inventories at the beginning of the year          1,269,470          831,879          680,113

        Plus: Charges of the year
               Raw materials, energy,
               consumables   and other movements          2,960,080        2,269,351        1,515,990
               Services and fees                            324,799          259,025          272,313
               Labor cost                                   420,714          369,681          286,748
               Depreciation of property, plant and
               equipment                                    182,696          174,880          171,896
               Amortization of intangible assets              5,025           12,748            6,763
               Maintenance expenses                          99,171           82,323           54,335
               Provisions for contingencies                     200              994            3,802
               Allowance for obsolescence                    20,303           23,167            6,011
               Taxes                                          3,170            3,088            4,273
               Others                                        33,243           19,270           37,462
                                                     -------------------------------------------------
                                                          4,049,401        3,214,527        2,359,593

        Less: Inventories at the end of the year        (1,376,113)      (1,269,470)        (831,879)
                                                     -------------------------------------------------
                                                          3,942,758        2,776,936        2,207,827
                                                     -------------------------------------------------



3    Selling, general and administrative expense




                                                                  Year ended December 31,
                                                    ----------------------------------------------------
                                                          2005             2004              2003
                                                                                     

        Services and fees                                  122,953           121,269          129,237
        Labor cost                                         214,216           157,114          134,769
        Depreciation of property, plant and
        equipment                                           10,319            10,218            8,477
        Amortization of intangible assets                   16,187            10,273           12,663
        Commissions, freights and other selling
        expenses                                           298,101           250,085          189,353
        Provisions for contingencies                        14,855            12,142            2,005
        Allowances for doubtful accounts                     7,069             7,187            5,704
        Taxes                                               93,782            59,256           45,337
        Others                                              65,092            44,905           39,290
                                                    ----------------------------------------------------
                                                            842,574          672,449           566,835
                                                    ----------------------------------------------------




                                      -21-



Tenaris S.A. Consolidated  financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------


4    Labor  costs   (included  in  Cost  of  sales  and  Selling,   general  and
     administrative expenses)




                                                                            Year ended December 31,
                                                                  ---------------------------------------------
                                                                      2005           2004            2003
                                                                                              

        Wages, salaries and social security costs                       622,523        509,572         410,458
        Employees' severance indemnity (Note 22 (i)(a))                  10,617         12,907           9,988
        Pension benefits - defined benefit plans (Note 22
           (i)(b))                                                        1,790          4,316           1,071
                                                                  ---------------------------------------------
                                                                        634,930        526,795         421,517
                                                                  ---------------------------------------------

At the year-end,  the number of employees was 17,693 in 2005, 16,447 in 2004 and
14,391 in 2003.

5    Other operating items

                                                                            Year ended December 31,
                                                                  ---------------------------------------------
                                                                       2005           2004           2003
(i)     Other operating income

        Reimbursement from insurance companies and other third
        parties                                                            1,966          3,165          1,544
        Net income from other sales                                        5,767         16,063          4,075
        Net income from disposition of investments in
        associated companies                                                   -              -          1,018
        Net rents                                                          2,501          1,362          2,222
        Fintecna arbitration award, net of legal expenses,
        related to BHP proceedings  (Note 26 (i))                          1,752        123,000               -
        Power plant - reimbursement from supplier
        (Note 26 (iv)(d))                                                      -          9,001               -
                                                                  ---------------------------------------------
                                                                          11,986        152,591          8,859
                                                                  ---------------------------------------------

(ii)    Other operating expense

        Provision for BHP proceedings                                          -              -        114,182
        Provisions for legal claims and contingencies                      8,694              -              -
        Loss on disposal of fixed assets and material supplies             2,146              -              -
        Allowance for doubtful receivables                                 1,443          2,104          1,728
        Power plant - impairment and associated charges
        (Note 26 (iv)(d))                                                      -         18,447              -
        Miscellaneous                                                      2,122          5,200          9,749
                                                                  ---------------------------------------------
                                                                          14,405         25,751        125,659
                                                                  ---------------------------------------------

6    Financial income (expense), net

                                                                            Year ended December 31,
                                                                  ---------------------------------------------
                                                                      2005           2004            2003
        Interest expense                                                (53,504)       (46,930)       (33,134)
        Interest income                                                  24,268         14,247         16,426
        Net foreign exchange transaction (losses) / gains  and
        changes in fair value of derivative instruments                 (86,618)        33,127        (16,165)
        Miscellaneous                                                     6,116          5,358          3,453
                                                                  ---------------------------------------------
                                                                       (109,738)         5,802        (29,420)
                                                                  ---------------------------------------------




                                      -22-



Tenaris S.A. Consolidated  financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------


7    Equity in earnings of associated companies




                                                                            Year ended December 31,
                                                                  ---------------------------------------------
                                                                      2005           2004            2003
                                                                                               

         Equity in earnings of associated companies (Note 12)           117,003        122,911          27,585
         Change in the fair value of convertible  debt option
         in Amazonia (Note 28 (d))                                            -         83,126               -
         Other                                                              374              -               -
                                                                  ---------------------------------------------
                                                                        117,377        206,037          27,585
                                                                  ---------------------------------------------

8    Income tax

                                                                            Year ended December 31,
                                                                  ---------------------------------------------
                                                                      2005           2004            2003
         Current tax                                                    637,623        277,219         148,240
         Deferred tax (Note 21)                                        (61,837)       (44,731)        (63,862)
                                                                  ---------------------------------------------
                                                                        575,786        232,488          84,378
         Effect of currency translation on tax base (Note 21)           (7,033)       (12,112)        (20,460)
                                                                  ---------------------------------------------
                                                                        568,753        220,376          63,918
                                                                  ---------------------------------------------


The tax on Tenaris' income before tax differs from the  theoretical  amount that
would arise using the tax rate in each country as follows:

                                                                            Year ended December 31,
                                                                  ---------------------------------------------
                                                                      2005           2004            2003

      Income before income tax                                        1,956,085      1,025,357         286,355
                                                                  ---------------------------------------------

      Tax calculated at the tax rate in each country                    592,153        268,488          99,060
      Non taxable income / Non deductible expenses                     (32,408)       (10,019)        (27,907)
      Changes in the tax rates in Mexico                                      -       (25,886)               -
      Effect of currency translation on tax base (a)                    (7,033)       (12,112)        (20,460)
      Effect of taxable exchange differences                             17,087         10,742          13,367
      Utilization of previously unrecognized tax losses                 (1,046)       (10,837)           (142)
                                                                  ---------------------------------------------
      Tax charge                                                        568,753        220,376          63,918
                                                                  ---------------------------------------------



(a)  Tenaris  applies the  liability  method to  recognize  deferred  income tax
     expense on temporary  differences between the tax bases of assets and their
     carrying  amounts  in the  financial  statements.  By  application  of this
     method,  Tenaris  recognizes gains and losses on deferred income tax due to
     the  effect of the  change in the  value of the  Argentine  peso on the tax
     bases of the fixed  assets of its  Argentine  subsidiaries,  which have the
     U.S.  dollar as their  functional  currency.  These  gains and  losses  are
     required by IFRS even though the devalued tax basis of the relevant  assets
     will result in a reduced  dollar value of  amortization  deductions for tax
     purposes in future periods throughout the useful life of those assets. As a
     result,  the  resulting  deferred  income tax charge  does not  represent a
     separate  obligation  of  Tenaris  that  is due and  payable  in any of the
     relevant periods.


                                      -23-



Tenaris S.A. Consolidated  financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------


9    Earnings and dividends per share


(i)  Earnings per share are  calculated by dividing the net income  attributable
     to equity  holders of the Company by the daily  weighted  average number of
     ordinary shares issued during the year.




                                                               Year ended December 31,
                                                 ----------------------------------------------------
                                                      2005              2004              2003
                                                                                    

     Net income attributable to equity  holders        1,277,547           784,703           210,308
     Weighted average number of ordinary
     shares in issue (thousands)                       1,180,537         1,180,507         1,167,230
     Basic and diluted earnings per share                   1.08              0.66              0.18
     Basic and diluted earnings per ADS                    10.82              6.65              1.80

     Dividends paid                                    (349,439)         (135,053)         (115,002)
     Dividends per share                                   0.296              0.11              0.10
     Dividends per ADS                                     2.960              1.14              0.99




10   Property, plant and equipment, net




                                  Land, building     Plant and      Vehicles,       Work in    Spare parts     Total
                                 and improvements    production   furniture and    progress        and
Year ended December 31, 2005                         equipment       fixtures                   equipment
                                 -------------------------------------------------------------------------------------
                                                                                          
Cost
Values at the beginning of the
year                                    353,416      5,386,286        118,193        84,942       19,263    5,962,100
Translation differences                   5,566      (104,101)          (244)           388        (844)     (99,235)
Additions                                 2,722         10,159          2,494       238,314       10,706      264,395
Disposals / Consumptions                (2,043)        (9,344)        (3,322)             -      (5,119)     (19,828)
Transfers / Reclassifications            24,593        118,426          6,843     (150,097)          231          (4)
Increase due to business
combinations                             23,937         40,755          2,351           168            -       67,211
                                 -------------------------------------------------------------------------------------
Values at the end of the year           408,191      5,442,181        126,315       173,715       24,237    6,174,639
                                 -------------------------------------------------------------------------------------
Depreciation
Accumulated at the beginning of
the year                                128,148      3,568,058         94,577             -        6,716    3,797,499
Translation differences                   1,778       (37,199)          (158)             -        (376)     (35,955)
Depreciation charge                      13,177        170,491          8,649             -          698      193,015
Disposals / Consumptions                  (515)        (7,047)        (2,229)             -        (167)      (9,958)
Transfers / Reclassifications           (6,357)          6,373           (16)             -            -            -
                                 -------------------------------------------------------------------------------------
Accumulated at the end of the           136,231      3,700,676        100,823             -        6,871    3,944,601
year
                                 -------------------------------------------------------------------------------------
At December 31, 2005                    271,960      1,741,505         25,492       173,715       17,366    2,230,038
                                 -------------------------------------------------------------------------------------




                                      -24-



Tenaris S.A. Consolidated  financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------





Year ended December 31, 2004      Land, building     Plant and      Vehicles,       Work in    Spare parts     Total
                                 and improvements    production   furniture and    progress        and
                                                     equipment       fixtures                   equipment
                                 -------------------------------------------------------------------------------------
                                                                                          
Cost
Values at the beginning of the
year                                    303,929      5,031,525        112,371        86,193       12,799    5,546,817
Translation differences                   6,938         87,970          2,520         2,107          643      100,178
Additions                                11,547         10,744          2,509       133,193        5,165      163,158
Disposals / Consumptions                (3,928)       (16,587)        (4,521)       (1,258)        (828)     (27,122)
Transfers / Reclassifications            20,039        111,674          1,824     (135,293)        1,433        (323)
Increase due to business
combinations                             14,891        172,665          3,490             -           51      191,097
                                 -------------------------------------------------------------------------------------
Values at the end of the year           353,416      5,397,991        118,193        84,942       19,263    5,973,805
                                 -------------------------------------------------------------------------------------
Depreciation
Accumulated at the beginning of
the year                                112,693      3,378,536         89,222             -        6,052    3,586,503
Translation differences                   1,836         37,514          1,773             -          135       41,258
Depreciation charge                      14,246        162,726          7,497             -          629      185,098
Disposals / Consumptions                  (603)       (11,083)        (3,567)             -         (17)     (15,270)
Transfers / Reclassifications              (24)            365          (348)             -         (83)         (90)
                                 -------------------------------------------------------------------------------------
Accumulated at the end of the           128,148      3,568,058         94,577             -        6,716    3,797,499
year
                                 -------------------------------------------------------------------------------------
Impairment (Note 26 (iv)(e))                  -       (11,705)              -             -            -     (11,705)
                                 -------------------------------------------------------------------------------------
At December 31, 2004                    225,268      1,818,228         23,616        84,942       12,547    2,164,601
                                 -------------------------------------------------------------------------------------



Property,  plant and equipment includes capitalized interest of $19,686. The net
amount at December 31, 2005 is $2,754.

11   Intangible assets, net




Year ended December 31, 2005                    Information     Licenses   Goodwill (a)   Negative        Total
                                              system projects and patents                 goodwill
                                                                                             (a)
                                              ----------------------------------------------------------------------
                                                                                             
Cost
Values at the beginning of the year                   114,584       11,028      112,664     (133,886)       104,390
Effect of adopting IFRS 3                                   -            -            -       133,886       133,886
Translation differences                               (4,148)      (1,172)            -             -       (5,320)
Additions                                              19,278          801            -             -        20,079
Increase due to business combinations                       -            -          769             -           769
Transfers / Reclassifications                               4            -            -             -             4
Disposals                                               (301)        (372)            -             -         (673)
                                              ----------------------------------------------------------------------
Values at the end of the year                         129,417       10,285      113,433             -       253,135
                                              ----------------------------------------------------------------------
Amortization and impairment
Accumulated at the beginning of the year               68,989        9,301            -      (23,111)        55,179
Effect of adopting IFRS 3                                   -            -            -        23,111        23,111
Translation differences                               (3,852)      (1,066)            -             -       (4,918)
Amortization charge                                    20,231          981            -             -        21,212
Transfers/ Reclassifications                                -            -            -             -             -
Disposals                                               (204)        (344)            -             -         (548)
                                              ----------------------------------------------------------------------
Accumulated at the end of the year                     85,164        8,872            -             -        94,036
                                              ----------------------------------------------------------------------
At December 31, 2005                                   44,253        1,413      113,433             -       159,099
                                              ----------------------------------------------------------------------




                                      -25-



Tenaris S.A. Consolidated  financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------


As disclosed in AP G (1), previously  accumulated  negative goodwill at December
31, 2004 was derecognized with a corresponding  adjustment to Retained earnings.
As a consequence,  the opening balance of the Company's  shareholders' equity at
January 1, 2005 increased of $110.8 million.




Year ended December 31, 2004                    Information     Licenses                  Negative
                                              system projects and patents  Goodwill (a)   goodwill
                                                                                            (a)          Total
                                              ---------------------------------------------------------------------
                                                                                            
Cost
Values at the beginning of the year                    88,802       10,490      142,904    (130,692)       111,504
Translation differences                                 3,850          579          164      (3,194)         1,399
Additions                                              20,022          132            -            -        20,154
Transfers / Reclassifications                           2,657        (173)            -            -         2,484
Disposals                                               (747)            -            -            -         (747)
                                              ---------------------------------------------------------------------
Values at the end of the year                         114,584       11,028      143,068    (133,886)       134,794
                                              ---------------------------------------------------------------------
Amortization
Accumulated at the beginning of the year               42,101        8,561       20,882     (14,077)        57,467
Translation differences                                 2,695          522          172            -         3,389
Amortization charge                                    21,600        1,105        9,350      (9,034)        23,021
Transfers/ Reclassifications                            3,138        (887)            -            -         2,251
Disposals                                               (545)            -            -            -         (545)
                                              ---------------------------------------------------------------------
Accumulated at the end of the year                     68,989        9,301       30,404     (23,111)        85,583
                                              ---------------------------------------------------------------------
At December 31, 2004                                   45,595        1,727      112,664    (110,775)        49,211
                                              ---------------------------------------------------------------------



     (a)  Corresponds to the Seamless segment

Impairment tests for goodwill

Goodwill is allocated to the Company's  cash-generating units ("CGU") identified
according to country of operation and business segment.


11   Intangible assets, net (Cont'd.)

A  geographical  segment-level  summary of the goodwill  allocation is presented
below.

                                  Year ended December 31,
                              ---------------------------------
                                  2005                2004
South America                         93,239            93,239
Europe                                   769                 -
North America                         19,425            19,425
                              ---------------------------------
At the end of the year               113,433           112,664
                              ---------------------------------

The recoverable amount of goodwill allocated to a CGU is determined based on its
value-in-use.  These  calculations use cash flow projections  based on financial
assumptions  approved by management  covering at least a minimum  period of five
years.  Cash flows beyond the minimum period are  extrapolated  using  estimated
growth rates.  No impairment  charge was required as a result of the  impairment
tests performed.

12   Investments in associated companies

                                                                Year ended
                                                                December 31,
                                                           ---------------------
                                                              2005        2004

  At the beginning of year                                    99,451      45,814
  Translation differences                                   (22,869)    (21,094)
  Equity in earnings of associated companies                 117,003     122,911
  Dividends and distributions received                      (59,127)    (48,598)
  Acquisitions                                                     -         418
  Capitalization of convertible loan in Amazonia (see
  note 28 (d))                                               120,058           -
  Increase in equity reserves in Ternium (see note 28 (d))     2,718           -
                                                           ---------------------
  At the end of year                                         257,234      99,451
                                                           ---------------------


                                      -26-



Tenaris S.A. Consolidated  financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------


The principal associated companies are:




                                       Country of         Percentage of ownership and       Value at December 31,
        Company                      incorporation       voting rights at December 31,
                                                       ----------------------------------
                                                           2005              2004             2005          2004
        -------------------------------------------------------------------------------------------------------------
                                                                                              
        Ternium S.A.               Luxembourg                 15.00%                   -        253,796            -
        Consorcio Siderurgia
        Amazonia Ltd.              Cayman Islands                  -              14.49%             -       76,007
        Ylopa Servicos de
        Consultadoria Lda.         Madeira                         -              24.40%              -       20,622
        Condusid C.A.              Venezuela                  20.00%              20.00%          2,860        2,375
        Others                     -                               -                   -            578          447
                                                                                          ---------------------------
                                                                                                257,234       99,451
                                                                                          ---------------------------



Summarized  financial  information  of  each  significant   associated  company,
including the aggregated amounts of assets, liabilities,  revenues and profit or
loss is as follows:




       Company               Assets             Liabilities               Revenues                Profit/Loss
                         2005      2004       2005        2004        2005         2004         2005        2004
                                                                                     

Ternium S.A.           8,659,981         -   5,084,062          -    4,447,680            -      704,406           -
Consorcio
Siderurgia  Amazonia
Ltd. (a)                       -   878,829           -    354,279            -      526,446            -     507,965
Ylopa Servicos de
Consultadoria Lda.
(b)                            -   800,289           -    715,772            -      205,080            -     203,763
Condusid C.A.             33,109    31,445      18,586     19,571       56,911       29,619        3,877     (1,794)

                      -----------------------------------------------------------------------------------------------



(a)  An impairment  provision  recorded in 2003 of $51.9 million was reversed in
     2004 due to improved  economic  conditions and an improvement in the market
     for Sidor's  products,  based on projections of future cash flows estimated
     by Amazonia's management.
(b)  At  December  31,  2004  the  retained   earnings  of  Ylopa   Servicos  de
     Consultadoria Lda. ("Ylopa") totalled $77.1 million.




13   Other investments - non current

                                                                  Year ended December 31,
                                                            ------------------------------------
                                                                  2005              2004
                                                                                   
            Deposits with insurance companies                         12,004             11,315
            Investments in other companies                            12,869             12,702
            Others                                                       774                378
                                                            ------------------------------------
                                                                      25,647             24,395
                                                            ------------------------------------




                                      -27-



Tenaris S.A. Consolidated  financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------


14   Receivables - non current




                                                                  Year ended December 31,
                                                            -------------------------------------
                                                                  2005               2004
                                                                                     

         Government entities                                            5,918              4,064
         Employee advances and loans                                    5,053              5,086
         Tax credits                                                    6,121              8,455
         Trade receivables                                              1,108              1,112
         Receivables from related parties                               3,321              4,750
         Convertible loans (Note 28 (d))                               40,358            121,955
         Receivables on off-take contract                               9,677              7,338
         Miscellaneous                                                  9,746             11,777
                                                            ------------------------------------
                                                                       81,302            164,537
         Allowances for doubtful accounts (Note 23 (i))              (15,450)           (13,172)
                                                            ------------------------------------
                                                                       65,852            151,365
                                                            ------------------------------------

15   Inventories

                                                                 Year ended December 31,
                                                            ------------------------------------
                                                                 2005               2004

         Finished goods                                            479,756            526,623
         Goods in process                                          404,518            256,203
         Raw materials                                             183,900            196,141
         Supplies                                                  241,974            214,604
         Goods in transit                                          151,715            143,021
                                                            ------------------------------------
                                                                 1,461,863          1,336,592
         Allowance for obsolescence (Note 24 (i))                  (85,750)           (67,122)
                                                            ------------------------------------
                                                                 1,376,113          1,269,470
                                                            ------------------------------------


16   Receivables and prepayments

                                                                  Year ended December 31,
                                                            ------------------------------------
                                                                   2005              2004

         Reimbursements and other services receivable               25,044              33,306
         Government entities                                        19,044              15,999
         Employee advances and loans                                 7,922               8,281
         Advances to suppliers                                      49,219              35,397
         Other advances                                              1,624               2,218
         Government tax refunds on exports                          16,410              19,683
         Fintecna arbitration award (Note 26 (i))                        -             126,126
         Receivables from related parties                           13,695              19,004
         Miscellaneous                                              23,411              27,782
                                                            ------------------------------------
                                                                   156,369             287,796
         Allowance for other doubtful accounts (Note 24 (i))       (13,087)             (8,346)
                                                            ------------------------------------
                                                                   143,282             279,450
                                                            ------------------------------------



                                      -28-



Tenaris S.A. Consolidated  financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------


17   Current tax assets




                                                                 Year ended December 31,
                                                            ------------------------------------
                                                                 2005              2004
                                                                               

         V.A.T. credits                                             90,000           82,580
         Prepaid taxes                                              12,455           12,416
                                                            ------------------------------------
                                                                   102,455           94,996
                                                            ------------------------------------

18   Trade receivables

                                                                  Year ended December 31,
                                                            ------------------------------------
                                                                   2005              2004

          Current accounts                                       1,256,882             848,304
          Notes receivables                                         60,972              83,882
          Receivables from related parties                          31,279              28,909
                                                            ------------------------------------
                                                                 1,349,133             961,095
          Allowance for doubtful accounts (Note 24 (i))            (24,962)            (24,164)
                                                            ------------------------------------
                                                                 1,324,171             936,931
                                                            ------------------------------------


19   Cash and cash equivalents, and Other investments

                                                                  Year ended December 31,
                                                            ------------------------------------
                                                                   2005              2004

(i)       Other investments
            Financial assets                                           119,907          119,666
                                                            ------------------------------------

(ii)      Cash and cash equivalents
          Cash and short-term highly liquid investments                707,356          311,573
         Time deposits with related parties                                  -                6
                                                            ------------------------------------
                                                                       707,356          311,579
                                                            ------------------------------------


20   Borrowings

                                                                  Year ended December 31,
                                                            ------------------------------------
                                                                   2005               2004
         Non-current
         Bank borrowings                                             634,280             372,275
         Debentures and other loans                                   38,407              40,845
         Finance lease liabilities                                     5,425               7,631
                                                            ------------------------------------
                                                                     678,112             420,751
                                                            ------------------------------------
         Current
         Bank borrowings                                             238,510             530,949
         Debentures and other loans                                   67,451             300,856
         Bank overdrafts                                              24,717               4,255
         Finance lease liabilities                                     1,502               2,531
                                                            ------------------------------------
                                                                     332,180             838,591
                                                            ------------------------------------
         Total Borrowings                                          1,010,292           1,259,342
                                                            ------------------------------------




                                      -29-



Tenaris S.A. Consolidated  financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------


The maturity of borrowings is as follows:




    At December 31, 2005    1 year     1 - 2     2 - 3     3 - 4     4 - 5    Over 5
                            or less    years     years     Years     years     Years      Total
                           ------------------------------------------------------------------------
                                                                       
    Financial leases          1,502     1,184       970       739        678    1,854       6,927
    Other borrowings        330,678   155,337   207,708   159,343    87,843    62,456   1,003,365
                           ------------------------------------------------------------------------
    Total borrowings        332,180   156,521   208,678   160,082    88,521    64,310   1,010,292
                           ------------------------------------------------------------------------



Significant borrowings include:

o    $300.0 million syndicated loan issued by Tamsa in March, 2005,  maturing in
     March 2010.

o    $125.0 million syndicated loan issued by Siderca in April,  2005,  maturing
     in April, 2008.

o    $144.0 million  syndicated loan granted to Dalmine in June,  2005, of which
     $72.0 million had been disbursed as of December 31, 2005.

The main financial covenants related to these loan agreements are commitment not
to incur in  additional  indebtedness  above agreed limits or pledges of certain
assets,  and  compliance  with certain debt service ratios as calculated on each
subsidiary's financial statements.

Additionally, Tenaris total borrowings include $204.8 million secured by certain
properties of Dalmine and Confab.

As of December 31, 2005,  Tenaris was in  compliance  with all of its  financial
covenants.  Management  believes that current debt covenants allow the Company a
high  degree of  operational  and  financial  flexibility  and do not impair its
ability to obtain additional financing at competitive costs.

The average  interest rates shown below were calculated  using the rates set for
each   instrument  in  its   corresponding   currency  and  weighted  using  the
dollar-equivalent  outstanding  principal amount of said instruments at December
31, 2005 and 2004. These rates reflect the upward trend in the reference rates.

                                               2005              2004
                                         ----------------- ------------------
     Bank borrowings                          5.14%              3.89%
     Debentures and other loans               4.51%              3.48%
     Finance lease liabilities                3.14%              2.99%

Breakdown of long-term borrowings by currency and rate is as follows:




      Non current bank borrowings

         Currency                Interest rates                    Year ended December 31,
      --------------------------------------------------------------------------------------------
                                                                   2005               2004
                                                                               

        USD                     Variable                             545,305            215,730
        EUR                     Variable                              93,621            160,026
        EUR                     Fixed                                 30,709              9,794
        JPY                     Variable                              23,310             48,170
        JPY                     Fixed                                 17,084             27,065
        BRS                     Variable                              23,306             24,099
        MXN                     Variable                                   -             24,406
                                                             -------------------------------------
                                                                     733,335            509,290
      Less: Current portion of medium and long-term loans           (99,055)          (137,015)
                                                             -------------------------------------
      Total non current bank borrowings                              634,280            372,275
                                                             -------------------------------------




                                      -30-



Tenaris S.A. Consolidated financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------
Non current debentures and other loans


           Currency       Interest rates         Year ended December 31,
      -------------------------------------------------------------------
                                                  2005            2004

            EUR             Variable                 -          70,811
            USD             Variable            49,332          45,382
            USD              Fixed                   -           5,449
                                              ---------------------------
                                                49,332         121,642

      Less: Current portion of medium
            and long-term loans                (10,925)        (80,797)
                                              ---------------------------
      Total non current Debentures
            and other loans                     38,407          40,845
                                              ===========================

     The Debentures issued in January 1998 were repaid at maturity, in January,
2005.




     Non current finance lease liabilities

           Currency       Interest rates         Year ended December 31,
      -------------------------------------------------------------------
                                                  2005            2004

            EUR             Variable                29             573
            EUR              Fixed                   -              78
            SGD              Fixed                   -               9
            JPY              Fixed               6,898           9,502
                                              ---------------------------
                                                 6,927          10,162
      Less: Current portion of medium
            and long-term loans                 (1,502)         (2,531)
                                              ---------------------------
      Total non current finance leases           5,425           7,631
                                              ===========================


The carrying amounts of Tenaris' assets pledged as collateral of liabilities are
as follows:

                                                 Year ended December 31,
                                              ---------------------------
                                                   2005          2004

     Property, plant and equipment mortgages     595,627       573,513
                                              ===========================



Breakdown of short-term borrowings by currency and rate is as follows:



     Current bank borrowings


       Currency       Interest rates              Year ended December 31,
      ------------------------------------------------------------------------
                                                    2005               2004

        USD             Variable                  50,597            161,357
        USD             Fixed                     55,946            153,448
        EUR             Variable                  64,810             51,232
        EUR             Fixed                      1,882              3,111
        JPY             Variable                  10,741             11,985
        JPY             Fixed                      5,226              4,995
        BRS             Variable                   5,197              3,450
        ARS             Variable                       -                169
        ARS             Fixed                     44,111            134,004
        VEB             Variable                       -              5,189
        VEB             Fixed                          -              2,009
                                            -----------------------------------
      Total current bank borrowings              238,510            530,949
                                            ===================================



                                      -31-



Tenaris S.A. Consolidated financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------

     Bank overdrafts


                 Currency                           Year ended December 31,
      -------------------------------------------------------------------------
                                                    2005               2004

        USD                                       16,406                326
        EUR                                        3,298                567
        ARS                                        3,193              3,050
        NGN                                            -                195
        RON                                            -                117
        VEB                                        1,820                  -
                                            -----------------------------------
      Total current bank borrowings               24,717              4,255
                                            ===================================


     Current debentures and other loans

        Currency     Interest rates               Year ended December 31,
      -------------------------------------------------------------------------
                                                     2005               2004

        EUR             Variable                   51,333            280,156
        USD             Variable                   16,118              9,177
        USD              Fixed                          -             11,523
                                                  -----------------------------
      Total current debentures and other loans     67,451            300,856
                                                  =============================

Current finance lease liabilities

        Currency     Interest rates               Year ended December 31,
      -------------------------------------------------------------------------
                                                    2005               2004

        EUR           Variable                         -                573
        EUR            Fixed                          29                 78
        SGD            Fixed                           -                  2
        JPY            Fixed                       1,473              1,878
                                                  -----------------------------
      Total current finance leases                 1,502              2,531
                                                  =============================


21   Deferred income tax

Deferred income taxes are calculated in full on temporary  differences under the
liability method using the tax rate of each country.



                                      -32-



Tenaris S.A. Consolidated financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------

The movement on the deferred income tax account is as follows:

                                                    Year ended December 31,
                                               -----------------------------
                                                     2005             2004

      At the beginning of the year                 210,802          287,521
      Translation differences                        8,605             (926)
      Increase due to business
        combinations                                     -              392
      Income statement credit                      (61,837)         (44,731)
      Effect of currency translation
        on tax base                                 (7,033)         (12,112)
      Deferred employees' statutory
        profit sharing charge                        7,984          (19,342)
                                               --------------  -------------
      At the end of the year                       158,521          210,802
                                               ==============  =============

The  evolution  of deferred  tax assets and  liabilities  during the year are as
follows:

     Deferred tax liabilities


                                                                                                       
                                                              Fixed assets     Inventories      Other (a)     Total at 2005
                                                              ---------------------------------------------------------------
At the beginning of the year                                       204,243         63,453       104,279         371,975
Translation differences                                             19,486          2,482           489          22,457
Income statement charge/(credit)                                     3,641        (20,335)      (24,343)        (41,037)
                                                              ---------------------------------------------------------------
At December 31, 2005                                               227,370         45,600        80,425         353,395
                                                              ===============================================================


                                                              Fixed assets     Inventories     Other (a)       Total at 2004
                                                              ---------------------------------------------------------------
At beginning of year                                               232,791         52,637       132,905         418,333
Translation differences                                              6,449             94         2,076           8,619
Increase due to business combinations                                    -              -           392             392
Acquisition of minority interest in subsidiaries                        20            276          (338)            (42)
Income statement (credit)/charge                                   (35,017)        10,446       (30,756)        (55,327)
                                                              ---------------------------------------------------------------
At December 31, 2004                                               204,243         63,453       104,279         371,975
                                                              ===============================================================


(a)  Includes the effect of currency translation on tax base explained in Note 8


     Deferred tax assets


                                                                                                    
                                                              Provisions
                                                                 and
                                                              allowances   Inventories   Tax losses    Other   Total at 2005
                                                              ---------------------------------------------------------------
At beginning of year                                           (62,629)      (41,292)    (15,707)    (41,545)    (161,173)
Translation differences                                        (13,239)         (232)        792      (1,173)     (13,852)
Income statement charge/(credit)                                43,237       (32,690)      2,922     (33,318)     (19,849)
                                                              ---------------------------------------------------------------
At December 31, 2005                                           (32,631)      (74,214)    (11,993)    (76,036)    (194,874)
                                                              ===============================================================



                                                              Provisions
                                                                 and
                                                              allowances   Inventories   Tax losses(a) Other   Total at 2005
                                                              ---------------------------------------------------------------
At beginning of year                                           (75,925)      (28,307)   (  8,287)    (18,293)    (130,812)
Translation differences                                         (7,365)         (316)       (351)     (1,513)      (9,545)
Acquisition of minority interest in subsidiaries                   (49)            -           -          91           42
Income statement charge/(credit)                                20,710       (12,669)     (7,069)    (21,830)     (20,858)
                                                              ---------------------------------------------------------------
At December 31, 2004                                           (62,629)      (41,292)    (15,707)    (41,545)    (161,173)
                                                              ===============================================================


(a)  The tax loss carry-forwards  arising from the BHP settlement is included in
     provisios and allowances.



                                      -33-



Tenaris S.A. Consolidated financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------
Deferred  income  tax  assets and  liabilities  are  offset  when (1) there is a
legally  enforceable  right to setoff  current  tax assets  against  current tax
liabilities  and (2)  the  deferred  income  taxes  relate  to the  same  fiscal
authority. The following amounts, determined after appropriate setoff, are shown
in the consolidated balance sheet:


                                               Year ended December 31,
                                         -----------------------------------
                                                2005              2004

      Deferred tax assets                     (194,874)         (161,173)
      Deferred tax liabilities                 353,395           371,975
                                         -----------------------------------
                                               158,521           210,802
                                         ===================================

     The amounts shown in the balance sheet include the following:

                                                        Year ended December 31,
                                                       -------------------------
                                                             2005        2004

     Deferred tax assets to be recovered after
      more than 12 months                                  (49,662)    (31,869)

     Deferred tax liabilities to be settled
      after more than 12 months                            225,486     246,072



22   Other liabilities

                                                       Year ended December 31,
                                                      ------------------------
  (i)    Other liabilities - Non-current                  2005          2004
         Employee liabilities
         Employees' statutory profit sharing            64,010         68,917
         Employee severance indemnity (a)               62,279         71,759
         Pension benefits (b)                           10,788         11,578
                                                      ------------------------
                                                       137,077        152,254

         Other liabilities
         Taxes payable                                   9,364          8,757
         Miscellaneous                                   7,937         11,431
                                                      ------------------------
                                                        17,301         20,188
                                                      ------------------------
                                                       154,378        172,442
                                                      ========================

(a)  Employees' severance indemnity

The amounts recognized in the balance sheet are as follows:

                                                        Year ended December 31,
                                                        ------------------------
                                                          2005          2004
         Total included in non-current
          Employee liabilities                           62,279         71,759
                                                        ========================

The amounts recognized in the income statement are as follows:

                                                     Year ended December 31,
                                                --------------------------------
                                                 2005        2004         2003

         Current service cost                    7,846      9,999        7,291
         Interest cost                           2,771      2,908        2,697
                                                --------------------------------
         Total included in Labor costs          10,617     12,907        9,988
                                                ================================

The principal actuarial assumptions used were as follows:
                                                       Year ended December 31,
                                                   -----------------------------
                                                    2005      2004       2003

         Discount rate                               5%         4%         5%
         Rate of compensation increase               4%         3%         4%



                                      -34-



Tenaris S.A. Consolidated financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------

(b)  Pension benefits

The amounts recognized in the balance sheet are determined as follows:

                                                    Year ended December 31,
                                                   -----------------------------
                                                       2005            2004

         Present value of unfunded obligations        15,707          16,478
         Unrecognized actuarial losses                (4,919)         (4,900)
                                                   -----------------------------
         Liability in the balance sheet               10,788          11,578
                                                   =============================


The amounts recognized in the income statement are as follows:

                                                        Year ended December 31,
                                                --------------------------------
                                                 2005         2004         2003

         Current service cost                      544         571          381
         Interest cost                             917         875          637
         Net actuarial losses
          recognized in the year                   329       2,870           53
                                                --------------------------------
         Total included in Labor costs           1,790       4,316        1,071
                                                ================================


Movement in the liability recognized in the balance sheet:

                                                        Year ended December 31,
                                                        -----------------------
                                                           2005        2004

         At the beginning of the year                     11,578      8,569
         Transfers and new participants of the plan            -      1,244
         Total expense                                     1,790      4,316
         Translation differences                            (272)       167
         Contributions paid                               (2,308)    (2,718)
                                                         ----------------------
         At the end of year                               10,788     11,578
                                                         =====================


The principal actuarial assumptions used were as follows:

                                                      Year ended December 31,
                                                  ------------------------------
                                                   2005        2004        2003
         Discount rate                               7%          7%          7%
         Rate of compensation increase               2%          2%          2%


                                                        Year ended December 31,
                                                       -------------------------
(ii)     Other liabilities - current                      2005           2004

         Payroll and social security payable            102,052         86,189
         Accounts payable- BHP Settlement
          (Note 26 (i))                                       -         80,517
         Liabilities with related parties                 2,688          1,432
         Miscellaneous                                   34,135         26,807
                                                       -------------------------
                                                        138,875        194,945
                                                       =========================



                                      -35-



Tenaris S.A. Consolidated financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------
23   Non-current allowances and provisions

(i)  Deducted from assets

     Allowance for doubtful accounts- Receivables        Year ended December 31,
                                                         -----------------------
                                                           2005         2004

       Values at the beginning of the year                (13,172)     (21,258)
       Translation differences                                185          154
       Reversals / Additional allowances (*)                  (81)         154
       Used (*)                                            (2,382)       7,778
                                                         -----------------------
     At December 31,                                      (15,450)     (13,172)
                                                         =======================

(*)  Includes effect of allowances on off-take  credits,  which are reflected in
     the Cost of sales.


(ii) Liabilities

     Legal claims and contingencies                      Year ended December 31,
                                                         -----------------------
                                                           2005         2004

       Values at the beginning of the year                31,776        23,333
       Translation differences                               406           800
       Increased due to business combinations                  -         2,355
       Reversals / Additional provisions                  16,015         7,438
       Used                                               (4,233)       (2,150)
                                                         -----------------------
     At December 31,                                      43,964        31,776
                                                         =======================


24   Current allowances and provisions

(i)  Deducted from assets


                                                                                                 
                                                          Allowance for        Allowance for other    Allowance for
                                                       doubtful accounts-      doubtful accounts-       inventory
                                                        Trade receivables      Other receivables      obsolescence
                                                      ----------------------------------------------------------------
         Year ended December 31, 2005
            Values at the beginning of the year             (24,164)               (8,346)               (67,122)
            Translation differences                           1,309                  (174)                 2,941
            Reversals /Additional allowances                 (4,722)               (3,709)               (20,303)
            Increase due to business combinations              (843)                    -                (11,931)
            Used                                              3,458                  (858)                10,665
                                                      ----------------------------------------------------------------
         At December 31, 2005                               (24,962)              (13,087)               (85,750)
                                                      =================================================================

         Year ended December 31, 2004
            Values at the beginning of the year             (24,003)               (5,761)               (47,743)
            Translation differences                            (611)                  (83)                (1,814)
            Reversals /Additional allowances                 (7,402)               (2,043)               (23,167)
            Increase due to business combinations              (835)                 (484)                (6,334)
            Used                                              8,687                    25                 11,936
                                                      ----------------------------------------------------------------
         At December 31, 2004                               (24,164)               (8,346)               (67,122)
                                                      =================================================================





                                      -36-



Tenaris S.A. Consolidated financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------
(ii) Liabilities


                                                                              
                                                              Other claims and
                                               Sales risks      contingencies     Total
                                              ------------------------------------------
      Year ended December 31, 2005
      Values at the beginning of the year          5,509          37,127         42,636
      Translation differences                      (518)         (3,849)        (4,367)
      Reversals / Additional provisions            (493)           8,227          7,734
      Used                                       (1,009)         (8,049)        (9,058)
                                              ------------------------------------------
      At December 31, 2005                         3,489          33,456         36,945
                                              ==========================================
      Year ended December 31, 2004
      Values at the beginning of the year          4,065          35,559         39,624
      Translation differences                        341           2,878          3,219
      Reversals / Additional provisions            6,254           (556)          5,698
      Used                                       (5,151)         (1,673)        (6,824)
      Increase due to business combinations            -             919            919
                                              ------------------------------------------
      At December 31, 2004                         5,509          37,127         42,636
                                              ==========================================


25   Derivative financial instruments

Net fair values of derivative financial instruments

The net fair  values of  derivative  financial  instruments  disclosed  in Other
liabilities and Other  receivables at the balance sheet date, in accordance with
IAS 39, were:


                                                         Year ended December 31,
                                                        ------------------------
                                                            2005         2004
          Contracts with positive fair values:
            Interest rate swap contracts                   3,641          192
            Forward foreign exchange contracts               441       12,163

          Contracts with negative fair values:
            Interest rate swap contracts                    (921)      (3,595)
            Forward foreign exchange contracts            (7,818)      (3,749)
            Commodities contracts                              -         (283)


Derivative financial instruments breakdown is as follows:

Variable interest rate swaps


                                                                 
                                                                           Fair Value
                                                                          December 31,
    Notional amount                                                --------------------------
    (in thousands)                    Swap               Term         2005          2004
  -------------------------------------------------------------------------------------------
  EUR          111,975     Pay fixed/Receive variable    2005            -        (1,493)
  EUR           22,616     Pay fixed/Receive variable    2007         (410)         (853)
  MXN          275,000     Pay fixed/Receive variable    2007            -          (148)
  EUR            1,404     Pay fixed/Receive variable    2009          (82)         (152)
  EUR            6,714     Pay fixed/Receive variable    2010         (429)         (757)
  USD          100,000     Pay fixed/Receive variable    2009        2,228             -
  USD          200,000        Interest rate collar       2010        1,413             -
                                                                   --------------------------
                                                                     2,720        (3,403)
                                                                   ==========================



                                      -37-



Tenaris S.A. Consolidated financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------

Exchange rate derivatives

                                                                   Fair Value
                                                                  December 31,
                                                              ------------------
       Currencies                Contract                      2005        2004
     ---------------------------------------------------------------------------
     USD/EUR         Euro Forward sales                           -        (107)
     USD/EUR         Euro Forward purchases                  (1,502)      1,083
     JPY/USD         Japanese Yen Forward purchases          (3,579)      5,388
     CAD/USD         Canadian Dollar Forward sales                -      (1,108)
     BRL/USD         Brazilian Real Forward sales                 8      (1,885)
     ARS/USD         Argentine Peso Forward purchases        (2,186)      2,154
     GBP/USD         Pound Sterling Forward purchases             -       3,449
     USD/MXN         Mexican Peso Forward sales                   -        (560)
     KWD/USD         Kuwaiti Dinar Forward sales               (118)          -
                                                             -------------------
                                                             (7,377)      8,414
                                                             ===================

Commodities price derivatives

                                                                 Fair Value
                                                                  December
                                                          ----------------------
            Contract                    Terms               2005         2004
          ----------------------------------------------------------------------
          Gas put options             2004-2005                -        (283)
                                                          ----------------------
                                                               -        (283)
                                                          ======================


26   Contingencies, commitments and restrictions on the distribution of profits

Tenaris is  involved in  litigation  arising  from time to time in the  ordinary
course of business.  Based on  management's  assessment  and the advice of legal
counsel,  it  is  not  anticipated  that  the  ultimate  resolution  of  pending
litigation will result in amounts in excess of recorded provisions (Notes 22 and
23) that would be  material  to  Tenaris'  consolidated  financial  position  or
results of operations.

(i)  BHP litigation and arbitration proceeding against Fintecna

On December 30, 2003 Dalmine and a consortium led by BHP Billiton Petroleum Ltd.
("BHP")  settled  their  litigation  concerning  the  failure  of an  underwater
pipeline.  The  pipe  that  was  the  subject  of the  litigation  with  BHP was
manufactured  and sold,  and the tort  alleged by BHP took  place,  prior to the
privatization of Dalmine. According to the terms of the settlement, Dalmine paid
BHP a total of GBP 108.0 million ($207.2 million),  inclusive of expenses.  This
amount,  was payable in three annual  installments,  net of advances  previously
made. The first two  installments  of GBP 30.3 million and GBP 30.4 million were
paid in January and December 2004,  respectively,  and the final  installment of
GBP 30.4  million  plus  interest at Libor plus 1% ($60.6  million)  was paid on
March 29, 2005. No charges against income resulted from this payment, as Tenaris
had previously recorded a provision related to this matter.

Techint Investments Netherlands B.V. ("Tenet") - the Tenaris subsidiary party to
the contract  pursuant to which Dalmine was  privatized - commenced  arbitration
proceedings against Fintecna S.p.A. ("Fintecna"),  an Italian state-owned entity
and   successor   to  ILVA  S.p.A.,   the  former  owner  of  Dalmine,   seeking
indemnification from Fintecna for any amounts paid or payable by Dalmine to BHP.
On  December  28,  2004,  an  arbitral  tribunal  rendered a final  award in the
arbitration proceeding against Fintecna.  Pursuant to this final award, Fintecna
paid Tenaris a total amount of euros 93.8 million ($127.2  million) on March 15,
2005. As a result of these  settlements,  the arbitration  proceedings have been
definitively  concluded and Tenaris has no further oustanding  obligations under
the BHP settlement agreement.

(ii) Tax matters



                                      -38-



Tenaris S.A. Consolidated financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------

Conversion of tax loss carry-forwards

On December 18, 2000,  the  Argentine  tax  authorities  notified  Siderca of an
income tax assessment related to the conversion of tax loss  carry-forwards into
Debt  Consolidation  Bonds  under  Argentine  Law No.  24.073.  The  adjustments
proposed by the tax  authorities  represent an estimated  contingency of ARP64.4
million  (approximately  $21.2  million)  at  December  31,  2005 in  taxes  and
penalties.  Based on the views of Siderca's tax advisors,  Tenaris believes that
the ultimate resolution of the matter will not result in a material  obligation.
Accordingly, no provision was recorded in these financial statements.

Application of inflationary adjustment procedures

On its tax return for the year ended December 31, 2002,  Siat S.A.,  ("Siat",  a
subsidiary of Tenaris domiciled in Argentina),  applied the inflation adjustment
procedure set forth in Title VI of the  Argentine  Income Tax Law to reflect the
impact  of  inflation  on  its  monetary  positions.  The  application  of  such
procedure,  however, had been suspended in March 1992 following the introduction
of the convertibility regime that pegged the Argentine peso to the United States
dollar  at a fixed  exchange  rate of one  peso to one  dollar  and had not been
reinstated after the termination of the convertibility regime.

Siat commenced legal proceedings objecting to the suspension of the inflationary
adjustment  procedure on  constitutional  grounds,  arguing that the  suspension
resulted in  artificial  gains  arising from the impact of inflation on monetary
positions during 2002. In July 29, 2005 Siat paid $4.5 million  corresponding to
the amount of tax due excluding the inflationary correction adjustment,  pending
resolution  of the legal  proceeding.  The  injunction  has been appealed by the
Argentine Tax Authority before the Federal Court of Appeals.

Siderca S.A.I.C. had also initiated similar proceedings against Argentine fiscal
authorities   seeking  relief  through  the  application  of  the   inflationary
adjustment  correction  in the  calculation  of its income tax liability for the
year ended December 31, 2002.  However, on October 29, 2004, Siderca applied for
benefits under the  promotional  regime  established by Argentine Law 25.924 and
committed to dismiss the legal proceedings  described in the previous paragraphs
in the event that Siderca were granted participation.

On February  11,  2005,  Siderca was  granted  the right to  participate  in the
promotional tax regime  established by Argentine Law 25,924 under which it could
potentially earn certain tax benefits.  As a result,  Siderca withdrew its claim
against the Argentine fiscal authorities. On February 21, 2005, Siderca paid ARS
$69.4 million ($23.8  million).  No charges  against  income  resulted from this
payment, as Tenaris had previously recorded a provision related to this matter.

(iii) Other Proceedings

Dalmine  is  currently  subject to twelve  civil  proceedings  for  work-related
injuries arising from the use of asbestos in its manufacturing  processes during
the period  from 1960 to 1980.  On June 1,  2005,  the First  Instance  Court of
Bergamo,  Italy,  found  against  three  former  Dalmine  managers  subject to a
consolidated criminal proceeding for "objective  responsibility" in the injuries
of 21  employees of the company  caused by the use of asbestos in  manufacturing
processes  from 1960 to 1980.  The managers  have  decided to appeal  before the
Court of Appeal of Brescia.

Of the 21 civil parties related to the above consolidated  criminal  proceeding,
20 have been settled.  In addition to the civil and criminal  cases,  another 22
asbestos  related  out-of-court  claims have been forwarded to Dalmine.  Dalmine
estimates  that its potential  liability in  connection  with the claims not yet
settled  or  covered by  insurance  is  approximately  EUR 10.3  million  ($12.4
million).

(iv) Commitments

     (a)  In  connection  with its equity  interest in Complejo  Siderurgico  de
          Guayana C.A. ("Comsigua"),  Tenaris pledged its shares in Comsigua and
          provided  a  proportional  guarantee  of $11.7  million  in support of
          project financing  provided by the International  Finance  Corporation
          ("IFC") in the amount of $156 million. On March 15, 2005 Comsigua



                                      -39-



Tenaris S.A. Consolidated financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------

          prepaid the remaining  balance of approximately  $42.5 million owed to
          the IFC related to the project financing loans. Tenaris has applied to
          the IFC for release  from its  proportional  guarantee  commitment  of
          Comsigua's project loan. This release is pending.

     (b)  In July 2004, Tenaris' subsidiary Matesi Materiales  Siderurgicos S.A.
          ("Matesi")   entered  into  a   twenty-year   agreement   with  C.V.G.
          Electrificacion  del  Caroni,  C.A.  ("Edelca")  for the  purchase  of
          electric power under certain take-or-pay conditions, with an option to
          terminate  the  contract  at any time upon  three  years  notice.  The
          agreement  established a start-up period until June 2005 for which the
          take-or-pay  conditions were not be in force. The outstanding value of
          the contract at December 31, 2005 is approximately $60.1 million.

     (c)  On August 20, 2004 Matesi  entered into a ten-year  off-take  contract
          pursuant to which Matesi is required to sell to Sidor on a take-or-pay
          basis 29.9% of Matesi's HBI  production.  In  addition,  Sidor has the
          right to increase its  proportion  on Matesi's  production by an extra
          19.9% until  reaching  49.8% of  Matesi's  HBI  production.  Under the
          contract,  the sale price is  determined  on a  cost-plus  basis.  The
          contract is renewable for additional  three year periods unless Matesi
          or  Sidor   objects  its  renewal  more  than  a  year  prior  to  its
          termination.

     (d)  Tenaris  entered in a contract  with  Siderar  for the supply of steam
          generated  at the power  generation  facility  owned by Tenaris in San
          Nicolas.  Under this  contract,  Tenaris is  required  to provide  250
          tn/hour of steam,  and Siderar has the  obligation to take or pay this
          volume.  This  outsourcing  contract is due to terminate  in 2018.  In
          October  2004,  Tenaris  detected  technical  problems at its electric
          power generating facility located in San Nicolas, Argentina during the
          routine  maintenance  of the  equipment.  GE Energy,  the  generator's
          manufacturer,  assumed  the  cost  of the  repairs  of the  generator,
          estimated at $9.0 million.  Tenaris  recognized a receivable  with the
          manufacturer  for the cost of the  repairs.  The Company  impaired the
          value of these assets under  Property,  Plant and  Equipment for $11.7
          million.  The reparation of the  generating  facility was completed by
          September 2005.

     (e)  Under a lease agreement  entered into in 2000 between Gade Srl (Italy)
          and Dalmine  relating to a building  located in Sabbio  Bergamasco and
          used by  Dalmine's  former  subsidiary,  Tad  Commerciale,  Dalmine is
          obligated to bid in the auction for the  purchase of a building  owned
          by Gade for a minimum amount of EUR 8.3 million ($10.0 million). As of
          the present, a date for the auction has not been announced.

     (f)  In August 2001,  Dalmine Energie S.p.A.  ("Dalmine  Energie")  entered
          into a ten-year  contract ending October 1, 2011 with Eni S.p.A. Gas &
          Power  Division  ("Eni") for the  purchase of natural gas with certain
          take-or-pay conditions.  The outstanding value of these commitments at
          December 31, 2005 amounts to  approximately  EUR 816.3 million ($963.0
          million).

     (g)  Under the Gas Release Program enacted by Eni, in August 2004,  Dalmine
          Energie  increased  its  supply of  natural  gas for the  period  from
          October 1, 2004 to  September  30,  2008.  The gas  purchase  and sale
          agreements  entered  into  with  Eni  contain  customary   take-or-pay
          conditions.  The  additional gas supply  mentioned  above is valued at
          approximately  EUR 266.3  million  ($313.3  million),  based on prices
          prevailing as of December 2005.  Dalmine Energie has also obtained the
          necessary  capacity  on  the  interconnection  infrastructure  at  the
          Italian  border to  transport  the natural gas to Italy for the supply
          period.

     (h)  Dalmine  Energie has entered into  arrangements  and expects to obtain
          additional gas transportation capacity on the Trans Austria Gasleitung
          GmbH ("TAG")  pipeline,  which is presently under  construction.  This
          capacity will allow Dalmine  Energie to import an incremental  1,176.5
          million  cubic  meters  of  natural  gas  per  year.   The  additional
          transportation capacity, which is subject to "ship or pay" provisions,
          will  be  available  on a firm  basis  on the TAG  pipeline  beginning
          October 2008 and through September 2028.

          The  expected  annual  value  of  this  "ship  or pay"  commitment  is
          approximately  EUR  5.0  million  per  year.   Tenaris  provided  bank
          guarantees  in the  amount of EUR 15.1  million  in support of Dalmine
          Energie.   The  value  of  the  bank  guarantees   correspond  to  the
          termination   penalties  that  would  be  due  TAG  in  the  event  of
          termination or non-utilization of the transportation capacity.

(v)  Restrictions on the distribution of profits and payment of dividends



                                      -40-



Tenaris S.A. Consolidated financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------
As of December 31, 2005,  shareholders'  equity as defined under  Luxembourg law
and regulations consisted of:

  (all amounts in thousands of U.S. dollars)
    Share capital                                                  1,180,537
    Legal reserve                                                    118,054
    Share premium                                                    609,733
    Retained earnings  including net income for the
     year ended December 31, 2005                                  1,171,738
                                                                 ------------
    Total shareholders equity according to Luxembourg law          3,080,062
                                                                 ============

At  least  5% of the net  income  per  year as  calculated  in  accordance  with
Luxembourg  law and  regulations  must be  allocated  to the creation of a legal
reserve  equivalent  to 10% of share  capital.  As of December  31,  2005,  this
reserve is fully  allocated and  additional  allocations  to the reserve are not
required under Luxembourg law. Dividends may not be paid from this reserve.

Tenaris  may pay  dividends  to the extent  that it has  distributable  retained
earnings and distributable  reserve calculated in accordance with Luxembourg law
and regulations.

At December 31, 2005, the distributable reserve, including retained earnings and
profit for the financial year, of Tenaris under Luxembourg law totalled $1,171.7
million, as detailed below.

(all amounts in thousands of U.S. dollars)

    Distributable reserve at December 31, 2004
     under Luxembourg law                                              536,541
    Dividends and distributions received                               449,270
    Other income and expenses for the year
     ended December 31, 2005                                           535,366
    Dividends paid                                                    (349,439)
                                                                    ------------
    Distributable reserve at December 31, 2005
     under Luxembourg law                                            1,171,738
                                                                    ============


27   Ordinary shares and share premium

                                            Number of Ordinary shares
                                      ------------------------------------
                                              2005                 2004

         At January 1                   1,180,536,830       1,180,287,664
         Net issue of shares                        -           249,166
                                      ------------------------------------
         At December 31                 1,180,536,830       1,180,536,830
                                      ------------------------------------

The total of issued and outstanding ordinary shares as of December 31, 2005 is
1,180,536,830 with a par value of $1.00 per share with one vote each.

28   Business combinations and other acquisitions

(a)  As described in AP B, management has applied IFRS 3 to the business
     combinations detailed below.

On May 4, 2005,  the Company  completed the  acquisition of 97% of the equity in
S.C. Donasid S.A., a Romanian steel producer, for approximately $47.9 million in
cash and assumed  liabilities.  The shares of Siprofer A.G. and Donasid  Service
S.r.l. were also acquired as part of this transaction.



                                      -41-



Tenaris S.A. Consolidated financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------

On July 26, 2004 Tenaris acquired all of the shares of Tubman International Ltd.
("Tubman"),  a company  incorporated  under the laws of  Gibraltar,  which owned
84.86%  of the  shares  of S. C.  Silcotub  S.A.  ("Silcotub")  and  controlling
interests in two minor  subsidiaries,  and all of the shares of  Intermetal  Com
S.r.l.  ("Intermetal") for a total consideration of $42.0 million. Silcotub, the
minor  subsidiaries and Intermetal are incorporated in Romania.  The acquisition
of these companies did not generate goodwill.

On July 9, 2004 Tenaris and Sidor,  through their jointly owned company  Matesi,
acquired the industrial facilities for the production of pre-reduced HBI located
in Ciudad Guayana,  Venezuela,  from Posven, a Venezuelan company.  The price of
the acquisition was $120.0 million.  The acquisition did not generate  goodwill.
As of December  31,  2005  Tenaris  held 50.2% of Matesi,  while Sidor owned the
remaining 49.8%.

Subsequently,  Tenaris reached agreement with the Romanian  privatization agency
("AVAS")  to  settle  litigation  commenced  by the  latter  against  Tubman  in
connection   with  its  alleged   breach  of  certain   obligations   under  the
privatization  agreement under which Tubman purchased control of S.C.  Laminorul
S.A.  ("Laminorul").  Pursuant  to the  agreement,  signed on  November  1, 2004
Tenaris  transferred  9,931,375  shares  of  Laminorul  (representing  69.99% of
Laminorul's  capital  stock) to the  Romanian  government,  retaining  2,334,145
shares (16.45% of Laminorul's capital stock).

The businesses  acquired in 2004  contributed  revenues of $93.2 million and net
income  of  $6.1  million  to  Tenaris.  Businesses  acquired  in  2005  did not
materially contribute to the Company's revenue and income.

The assets and liabilities arising from the acquisitions are as a follows:

                                                    Year ended December 31,
                                                      2005           2004
                                                   --------------------------
  (all amounts in thousands of U.S. dollars)

  Other assets and liabilities (net)                 (41,755)     (25,060)
  Property, plant and equipment                       67,211      191,097
  Goodwill                                               769            -
                                                   --------------------------
  Net assets acquired                                 26,225      166,037
  Minority Interest                                     (527)      (8,034)
                                                   --------------------------
  Total non-current liabilities (*)                        -      (60,408)
                                                   --------------------------
  Total liabilities assumed                                -      (60,408)
                                                   --------------------------
  Sub-total                                           25,698       97,595
                                                   --------------------------
  Cash-acquired                                            -        5,177
  Common stock issued in acquisition of
    minority interest                                                 820
                                                   --------------------------
  Purchase consideration                              25,698      103,592
  Liabilities paid as part of purchase
   agreement                                          22,594            -
                                                   --------------------------
  Total disbursement                                  48,292      103,592
                                                   ==========================

     Net cash  consideration  (total  disbursement less cash acquired and common
     stock issued in acquisition of minority  interest) amounted to $ 48,292 and
     $ 97,595 at December 31, 2005 and 2004 respectively.

     (*)  At December 31, 2004 includes Matesi's  liability with Sidor (minority
          shareholder of Matesi).


(b)  Incorporations:  On  January  23,  2004  Tenaris  Investments  Limited  was
     incorporated  in Ireland to assist the financial  activities of the Company
     and its other  subsidiaries;  on that date,  Tenaris  underwrote all of the
     common  shares of the new company and increased  the  subsidiary's  capital
     stock to $50.0 million.

(c)  Asset Purchases:  On February 2, 2004 Tenaris completed the purchase of the
     land and  manufacturing  facilities  that  were  previously  leased  by its
     Canadian operating  subsidiary.  The assets were acquired from Algoma Steel
     Inc. for the price of approximately $9.6 million, plus transaction costs.



                                      -42-



Tenaris S.A. Consolidated financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------

(d)  Capitalization of Convertible Debt of Consorcio Siderurgia  Amazonia,  Ltd.
     ("Amazonia")  and Exchange of  Interests in Amazonia and Ylopa  Servicos de
     Consultadoria Lda. ("Ylopa") for shares of Ternium S.A. ("Ternium")

     On February 3, 2005,  Ylopa exercised its option to convert the convertible
     debt  it  held  in  Amazonia  into  common  stock.  In  connection  of this
     conversion,  Tenaris  recognized  a gain of $83.1  million  in  2004.  As a
     result, Tenaris' ownership stake in Amazonia increased from 14.5% to 21.2%,
     and its indirect ownership in Sidor C.A.  ("Sidor")  increased from 8.7% to
     12.6%.

     On September 9, 2005,  the Company  exchanged  its interest in Amazonia and
     its interest in Ylopa,  for  209,460,856  shares in Ternium,  a new company
     formed  by  San  Faustin  N.V.  (a  Netherlands  Antilles  corporation  and
     controlling  shareholder  of Tenaris)  to  consolidate  its Latin  American
     holdings in flat and long steel producers Siderar S.A.I.C.,  Sidor C.A. and
     Hylsamex, S.A de C.V. . As a result of the exchange,  which was carried out
     based  on  fair  values  as  determined  by an  internationally  recognized
     investment  bank engaged for this  purpose,  Tenaris  obtained an ownership
     interest of approximately 17.9% in Ternium.

     Subsequently, on October 27, 2005, Usinas Siderurgicas de Minas Gerais S.A.
     ("Usiminas")  reached  agreement  with Ternium to exchange its interests in
     Amazonia,  Ylopa and Siderar  S.A.I.C.,  plus additional  consideration  of
     approximately  $114.1 million provided as a convertible loan, for an equity
     stake in Ternium.  As a result of this  transaction,  at December 31, 2005,
     Tenaris'  ownership  stake in Ternium  was  reduced  to 15.0% of  Ternium's
     outstanding common stock. As this was an equity transaction in Ternium, the
     effect of $2.7 million at Tenaris's  percentage of ownership was recognized
     in other reserves in equity.

     In addition,  as of December 31, 2005,  Tenaris had also extended two loans
     totaling  approximately  $40.4 million to Ternium,  consisting of principal
     amount of $39.7  million plus accrued  interest.  The  principal  amount of
     these  loans at the date issue  corresponded  to the amount of excess  cash
     distributions  received from Amazonia  during the second and third quarters
     of  2005.  The  loans  were  convertible  into  shares  of  Ternium  at the
     discretion  of Tenaris upon the  occurrence  of: 1) maturity of the loan in
     July and August  2011;  2) an event of  default as defined in certain  loan
     agreements  between  Ternium  and its  banks.  Conversion  of the  loan was
     mandatory upon an initial public offering ("IPO") of shares by Ternium.

     On February 1, 2006,  Ternium  completed  its  initial  public  offering of
     shares,  issuing an additional 248,447,200 shares (equivalent to 24,844,720
     ADS) at a price of $2.00 per share, or $20.00 per ADS.  Tenaris received an
     additional  20,252,338 shares upon the mandatory conversion of its loans to
     Ternium.  In  addition  to the shares  issued to  Tenaris,  Ternium  issued
     additional  shares to other  shareholders  corresponding to their mandatory
     convertible  loans.  As a result of the IPO and the conversion of loans, as
     of February  1, 2006,  Tenaris'  ownership  stake in Ternium  common  stock
     amounted to 11.59%.

     Because the  exchange of its  holdings in Amazonia  and Ylopa for shares in
     Ternium,  were considered to be transactions between companies under common
     control,  Tenaris has initially  recorded its ownership interest in Ternium
     at the carrying  value of the  investments  exchanged.  At the  transaction
     date,  the carrying  value of Amazonia and Ylopa was $229.7  million  while
     Tenaris'  proportional  ownership in the equity of Ternium at September 30,
     2005 amounted to $252.3  million.  The difference of $22.6 million  between
     the  carrying  value  of  Amazonia  and  Ylopa  and  Tenaris'  proportional
     ownership in the equity of Ternium will be maintained  in the future.  As a
     result  of  this  accounting  treatment,  Tenaris'  reported  value  of its
     investment  in Ternium  will not  reflect  its  proportional  ownership  of
     Ternium's net equity position.

     Until September 30, 2005, Tenaris  recognized its proportional  earnings in
     Amazonia and Ylopa, which amounted to $26.5 million.  For the quarter ended
     December 31, 2005,  Tenaris  recognized  earnings  from its  investment  in
     Ternium  in the  amount  of $21.8  million.  Going  forward,  Tenaris  will
     continue to recognize its share of Ternium's  earnings to the extent of its
     proportional ownership.

(e)  Acindar:  On May 18, 2005, Siat S.A., a subsidiary of Tenaris,  and Acindar
     Industria  Argentina de Aceros S.A.  ("Acindar")  signed a letter of intent
     pursuant to which Siat confirmed its intention to acquire  Acindar's welded
     pipe assets and facilities located in Villa Constitucion, province of Santa
     Fe, Argentina, for $28.0 million. On January 31, 2006 Siat completed this



                                      -43-



Tenaris S.A. Consolidated financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------
     acquisition. The facilities acquired have an annual capacity of 80,000 tons
     of welded pipes whose small diameter range largely complements the range of
     welded  pipes that  Tenaris  produces in  Argentina.  Of the $28.0  million
     purchase  price,  approximately  $4.0 million are pending of  completion of
     certain actions by Acindar.

(f)  Capital  Investment:  On  September  16, 2004  Tenaris'  Board of Directors
     approved an  investment  to construct a gas-fired  120 MW combined heat and
     power plant in Dalmine,  Italy with an estimated cost of approximately  EUR
     109 million  (approximately  $131 million).  This investment is expected to
     improve the competitiveness of Tenaris' Italian seamless pipe operations by
     reducing energy costs and securing a reliable source of power.

29   Related party transactions

The  Company  is  controlled  by  San  Faustin  N.V.,  a  Netherlands   Antilles
corporation,  which  owns  60.4% of the  Company's  outstanding  shares,  either
directly or through its wholly-owned  subsidiary I.I.I.  Industrial  Investments
Inc., a Cayman  Islands  corporation.  The  Company's  directors  and  executive
officers  as a group own 0.2% of the  Company's  outstanding  shares,  while the
remaining  39.4% is publicly  traded.  The  ultimate  controlling  entity of the
Company is Rocca & Partners S.A., a British Virgin Islands corporation.

The following transactions were carried out with related parties:

   At December 31, 2005
                                           Associated (1)      Other      Total
   (i) Transactions

   (a) Sales of goods and services
      Sales of goods                             104,054     75,948     180,002
      Sales of services                            7,499      7,830      15,329
                                          --------------------------------------
                                                 111,553     83,778     195,331
                                          --------------------------------------
   (b) Purchases of goods and services
      Purchases of goods                          67,814     33,949     101,763
      Purchases of services                       15,773     63,220      78,993
                                          --------------------------------------
                                                  83,587     97,169     180,756
                                          --------------------------------------
   At December 31, 2004
                                           Associated (2)      Other      Total
   (i) Transactions
   (a) Sales of goods and services
      Sales of goods                              26,088     46,844      72,932
      Sales of services                           15,365      9,618      24,983
                                          --------------------------------------
                                                  41,453     56,462      97,915
                                          --------------------------------------
   (b) Purchases of goods and services
      Purchases of goods                          30,648     32,484      63,132
      Purchases of services                        7,526     51,305      58,831
                                          --------------------------------------
                                                  38,174     83,789     121,963
                                          --------------------------------------



                                      -44-



Tenaris S.A. Consolidated financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------

   At December 31, 2003
                                           Associated (2)      Other      Total
   (i) Transactions
   (a) Sales of goods and services
      Sales of goods                               5,206     52,659      57,865
      Sales of services                            2,895      8,916      11,811
                                          --------------------------------------
                                                   8,101     61,575      69,676
                                          --------------------------------------
   (b) Purchases of goods and services
      Purchases of goods                          26,679     44,305      70,984
      Purchases of services                          459     64,334      64,793
                                          --------------------------------------
                                                  27,138    108,639     135,777
                                          --------------------------------------
   (c) Acquisitions of subsidiaries                    -       (304)       (304)
                                          --------------------------------------

   At December 31, 2005
                                           Associated (3)      Other      Total
   (ii) Year-end balances
      (a) Arising from sales/purchases of
           goods/services
         Receivables from related parties         30,988     15,228      46,216
         Payables to related parties (1)         (21,034)    (8,413)    (29,447)
                                          --------------------------------------
                                                   9,954      6,815      16,769
                                          --------------------------------------
       (b) Other balances                         42,437          -      42,437
                                          --------------------------------------
       (c) Financial debt
          Borrowings and overdrafts (4)          (54,801)         -     (54,801)
                                          --------------------------------------


   At December 31, 2004
                                           Associated (2)      Other      Total
   (ii) Year-end balances

      (a) Arising from sales/purchases of
           goods/services
         Receivables from related parties         25,593     27,070      52,663
         Payables to related parties (1)          (4,914)   (12,487)    (17,401)
                                          --------------------------------------
                                                  20,679     14,583      35,262
                                          --------------------------------------
      (b) Cash and cash equivalents
         Time deposits                                 -          6           6
                                          --------------------------------------
       (c) Other balances
          Trust Fund                                   -    119,666     119,666
          Convertible debt instruments -
           Ylopa                                 121,955          -     121,955
                                          --------------------------------------
                                                 121,955    119,666     241,621
                                          --------------------------------------
       (d) Financial debt
          Borrowings and overdrafts (5)          (51,457)    (5,449)    (56,906)
                                          --------------------------------------



                                      -45-




   At December 31, 2003
                                           Associated (2)      Other      Total
   (ii) Year-end balances
      (a) Arising from sales/purchases of
           goods/services
         Receivables from related parties          6,253     35,863      42,116
         Payables to related parties             (18,968)   (18,251)    (37,219)
                                          --------------------------------------
                                                 (12,715)    17,612       4,897
                                          --------------------------------------
      (b) Cash and cash equivalents
         Time deposits                                 -        420         420
                                          --------------------------------------
      (c) Other balances
          Trust Fund                                   -    118,087     118,087
          Convertible debt instruments -
           Ylopa                                  33,508          -      33,508
                                          --------------------------------------
                                                  33,508    118,087     151,595
                                          --------------------------------------
       (d) Financial debt
          Borrowings and overdrafts                    -     (5,716)     (5,716)
          Borrowings from trust fund                   -     (1,789)     (1,789)
                                          --------------------------------------
                                                       -     (7,505)     (7,505)
                                          --------------------------------------

(1)  Up to September 30, 2005 includes: Condusid, Ylopa, Amazonia and Sidor.
     From October 1, 2005 includes: Condusid and Ternium.
(2)  Includes: Condusid, Ylopa, Amazonia and Sidor
(3)  Includes: Condusid and Ternium.
(4)  Convertible loan from Sidor to Matesi.
(5)  Includes convertible loan from Sidor to Matesi of $51.5 million at December
     31, 2004.

(iii) Officers and directors' compensation

The aggregate compensation of the directors and executive officers earned during
2005 and 2004 amounts to $14.3 million and $9.8 million respectively.

30   Cash flow disclosures




                                                                   Year ended December 31,
                                                     -----------------------------------------------------
                                                           2005             2004              2003
(i)      Changes in working capital
                                                                                     

         Inventories                                       (101,143)        (411,045)        (151,766)
         Receivables and prepayments                          1,513          (82,845)          10,900
         Trade receivables                                 (387,240)        (271,225)           4,142
         Other liabilities                                   34,526          (37,443)          39,585
         Customer advances                                  (14,156)          72,678           17,636
         Trade payables                                      32,561          108,693          (27,653)
                                                     -----------------------------------------------------
                                                           (433,939)        (621,187)        (107,156)
                                                     -----------------------------------------------------




                                      -46-



Tenaris S.A. Consolidated  financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------


(ii)     Income tax accruals less payments




                                                                                     
         Tax accrued                                         568,753          220,376            63,918
         Taxes paid                                         (419,266)        (175,717)         (202,488)
                                                     -----------------------------------------------------
                                                             149,487           44,659          (138,570)
                                                     -----------------------------------------------------

(iii)    Interest accruals less payments, net

         Interest accrued                                     29,236           32,683            16,708
         Interest paid net                                   (27,317)         (15,710)          (19,740)
                                                     -----------------------------------------------------
                                                               1,919           16,973            (3,032)
                                                     -----------------------------------------------------

(iv)    Cash and cash equivalents

        Cash and bank deposits                               707,356          311,579           247,834
        Bank overdrafts                                      (24,717)          (4,255)           (9,804)
        Restricted bank deposits                              (2,048)         (13,500)                -
                                                     -----------------------------------------------------
                                                             680,591          293,824           238,030
                                                     -----------------------------------------------------




                                      -47-



Tenaris S.A. Consolidated  financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------


31   Principal subsidiaries

The  following is a list of Tenaris's  subsidiaries  and its direct and indirect
percentage of ownership of each company at December 31, 2005, 2004 and 2003.




---------------------------------------------------------------------------------------------------------------------------
                 Company                      Country of               Main activity             Percentage of ownership
                                             Organization                                            at December 31,
---------------------------------------------------------------------------------------------------------------------------
                                                                                                  2005     2004     2003
---------------------------------------------------------------------------------------------------------------------------
                                                                                                     
Algoma Tubes Inc.                          Canada            Manufacturing of seamless steel      100%     100%     100%
                                                             pipes
---------------------------------------------------------------------------------------------------------------------------
Confab Industrial S.A. and subsidiaries    Brazil            Manufacturing of welded steel        39%      39%      39%
(c)                                                          pipes and capital goods
---------------------------------------------------------------------------------------------------------------------------
Dalmine Energie S.p.A. (h)                 Italy             Trading of energy                    100%     100%     100%
---------------------------------------------------------------------------------------------------------------------------
Dalmine Holding B.V. and subsidiaries      Netherlands       Holding company                      99%      99%      99%
---------------------------------------------------------------------------------------------------------------------------
Dalmine S.p.A.                             Italy             Manufacturing of seamless steel      99%      99%      99%
                                                             pipes
---------------------------------------------------------------------------------------------------------------------------
Tenaris Fittings S.A. de C.V. (previously  Mexico            Manufacturing of welded fittings     100%     100%     100%
Empresas Riga S.A. de C.V.)                                  for seamless steel pipes
---------------------------------------------------------------------------------------------------------------------------
Energy Network S.R.L. (b)                  Romania           Trading of energy                    100%      -        -
---------------------------------------------------------------------------------------------------------------------------
Exiros S.A.                                Uruguay           Procurement services for             100%     100%     100%
                                                             industrial companies
---------------------------------------------------------------------------------------------------------------------------
Information Systems and Technologies N.V.  Netherlands       Software development and             75%      75%      75%
                                                             maintenance
---------------------------------------------------------------------------------------------------------------------------
Information Systems and Technologies S.A.  Argentina         Software development and             100%     100%     100%
(d)                                                          maintenance
---------------------------------------------------------------------------------------------------------------------------
Inmobiliaria Tamsa S.A. de C.V.            Mexico            Leasing of real estate               100%     100%     100%
---------------------------------------------------------------------------------------------------------------------------
Insirger S.A. and subsidiaries (g)         Argentina         Electric power generation             -       100%     100%
---------------------------------------------------------------------------------------------------------------------------
Intermetal Com SRL (a)                     Romania           Marketing of Scrap and other raw     100%     100%      -
                                                             materials
---------------------------------------------------------------------------------------------------------------------------
Inversiones Berna S.A.  (b)                Chile             Financial company                    100%      -        -
---------------------------------------------------------------------------------------------------------------------------
Inversiones Lucerna S.A.  (b)              Chile             Financial company                    82%       -        -
---------------------------------------------------------------------------------------------------------------------------
Invertub S.A. and subsidiaries (g)         Argentina         Holding Company                       -       100%     100%
---------------------------------------------------------------------------------------------------------------------------
Lomond Holdings B.V. and subsidiaries      Netherlands       Procurement services for             100%     100%     100%
                                                             industrial companies
---------------------------------------------------------------------------------------------------------------------------
Matesi, Materiales Siderurgicos S.A.  (a)  Venezuela         Production of hot briquetted iron    50%      50%       -
                                                             (HBI)
---------------------------------------------------------------------------------------------------------------------------
Metalcentro S.A.                           Argentina         Manufacturing of pipe-end            100%     100%     100%
                                                             protectors and lateral impact
                                                             tubes
---------------------------------------------------------------------------------------------------------------------------
Metalmecanica S.A.                         Argentina         Manufacturing of steel products      100%     100%     100%
                                                             for oil extraction
---------------------------------------------------------------------------------------------------------------------------
NKK Tubes K.K.                             Japan             Manufacturing of seamless steel      51%      51%      51%
                                                             pipes
---------------------------------------------------------------------------------------------------------------------------
Operadora Electrica S.A. (e)               Argentina         Electric power generation            100%     100%     100%
---------------------------------------------------------------------------------------------------------------------------




                                      -48-



Tenaris S.A. Consolidated  financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------

31       Principal subsidiaries (Cont'd.)




--------------------------------------------------------------------------------------------------------------------------
                 Company                       Country of              Main activity          Percentage of ownership at
                                              Organization                                           December 31,
--------------------------------------------------------------------------------------------------------------------------
                                                                                                2005      2004     2003
--------------------------------------------------------------------------------------------------------------------------
                                                                                                     
Quality Tubes (UK) Ltd. (h)                United Kingdom      Marketing of steel products      100%      100%     100%
--------------------------------------------------------------------------------------------------------------------------
S.C. Donasid and subsidiary (b)            Romania             Manufacturing of steel            99%       -        -
                                                               products
--------------------------------------------------------------------------------------------------------------------------
S.C. Silcotub S.A. and subsidiaries (a)    Romania             Manufacturing of seamless         85%      85%       -
                                                               steel pipes
--------------------------------------------------------------------------------------------------------------------------
Scrapservice S.A.                          Argentina           Processing of scrap               75%      75%      75%
--------------------------------------------------------------------------------------------------------------------------
Servicios Generales TenarisTamsa S.A. de   Mexico              Handling and maintenance of      100%      100%     100%
C.V. (f)                                                       steel pipes
--------------------------------------------------------------------------------------------------------------------------
Siat S.A.                                  Argentina           Manufacturing of welded steel     82%      82%      82%
                                                               pipes
--------------------------------------------------------------------------------------------------------------------------
Siderca International A.p.S.               Denmark             Holding company                  100%      100%     100%
--------------------------------------------------------------------------------------------------------------------------
Siderca S.A.I.C.                           Argentina           Manufacturing of seamless        100%      100%     100%
                                                               steel pipes
--------------------------------------------------------------------------------------------------------------------------
Siderestiba S.A.                           Argentina           Logistics                         99%      99%      99%
--------------------------------------------------------------------------------------------------------------------------
Sidtam Limited                             B.V.I.              Holding company                  100%      100%     100%
--------------------------------------------------------------------------------------------------------------------------
Siprofer A.G. (b)                          Switzerland         Holding company                  100%       -        -
--------------------------------------------------------------------------------------------------------------------------
SO.PAR.FI Dalmine Holding S.A.             Luxembourg          Holding company                   99%      99%      99%
--------------------------------------------------------------------------------------------------------------------------
Sociedad Industrial Puntana S.A.           Argentina           Manufacturing of steel           100%      100%     100%
                                                               products
--------------------------------------------------------------------------------------------------------------------------
Socominter S.A.                            Venezuela           Marketing of steel products      100%      100%     100%
--------------------------------------------------------------------------------------------------------------------------
Socominter Ltda.                           Chile               Marketing of steel products      100%      100%     100%
--------------------------------------------------------------------------------------------------------------------------
Talta - Trading e Marketing Lda. (a)       Madeira             Holding Company                  100%      100%      -
--------------------------------------------------------------------------------------------------------------------------
Tamdel LLC and subsidiaries (f)            Mexico              Holding company                  100%      100%     100%
--------------------------------------------------------------------------------------------------------------------------
Tamser S.A. de C.V. (f)                    Mexico              Marketing of scrap               100%      100%     100%
--------------------------------------------------------------------------------------------------------------------------
Tamsider LLC                               USA                 Holding company                  100%      100%     100%
--------------------------------------------------------------------------------------------------------------------------
Tamsider S.A. de C.V. and subsidiaries (g) Mexico              Promotion and organization of      -       100%     100%
                                                               steel-related companies and
                                                               marketing of steel products
--------------------------------------------------------------------------------------------------------------------------
Tamtrade S.A.de C.V. (g)                   Mexico              Marketing of steel products        -       100%     100%
--------------------------------------------------------------------------------------------------------------------------
Techint Investment Netherlands B.V.        Netherlands         Holding company                  100%      100%     100%
--------------------------------------------------------------------------------------------------------------------------
Tenaris Autopartes S.A. de C.V.            Mexico              Manufacturing of supplies for    100%      100%     100%
                                                               the automotive industry
--------------------------------------------------------------------------------------------------------------------------




                                      -49-



Tenaris S.A. Consolidated  financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------





--------------------------------------------------------------------------------------------------------------------------
                                                                                                     
Tenaris Confab Hastes de Bombeio  S.A. (a) Brazil              Manufacturing of steel            70%      70%       -
                                                               products for oil extraction
--------------------------------------------------------------------------------------------------------------------------
Tenaris Connections A.G. and subsidiaries   Liechtenstein      Ownership and licensing of       100%     100%     99%
                                                               steel technology
--------------------------------------------------------------------------------------------------------------------------
Tenaris Financial Services S.A.             Uruguay            Financial Services               100%     100%    100%
--------------------------------------------------------------------------------------------------------------------------
Tenaris Global Services B.V.                Netherlands        Sales agent of steel products    100%     100%    100%
--------------------------------------------------------------------------------------------------------------------------
Tenaris Global Services (B.V.I.) Ltd.       B.V.I.             Holding company                  100%     100%    100%
--------------------------------------------------------------------------------------------------------------------------
Tenaris Global Services (Canada) Inc.       Canada             Marketing of steel products      100%     100%    100%
--------------------------------------------------------------------------------------------------------------------------
Tenaris Global Services de Bolivia S.R.L.   Bolivia            Marketing of steel products      100%     100%    100%
(previously Socominter de Bolivia S.R.L.)
--------------------------------------------------------------------------------------------------------------------------
Tenaris Global Services  Ecuador S.A.       Ecuador            Marketing of steel products      100%     100%    100%
--------------------------------------------------------------------------------------------------------------------------
Tenaris Global Services  (Egypt) Ltd. (b)   Egypt              Marketing of steel products      100%      -        -
--------------------------------------------------------------------------------------------------------------------------
Tenaris Global Services Far East Pte.       Singapore          Marketing of steel products      100%     100%    100%
Ltd.
--------------------------------------------------------------------------------------------------------------------------
Tenaris Global Services (Japan) K.K.        Japan              Marketing of steel products      100%     100%    100%
(previously DST Japan K.K.)
--------------------------------------------------------------------------------------------------------------------------
Tenaris Global Services (Kazakhstan ) LLP   Kazakhstan         Marketing of steel products      100%     100%      -
(a)
--------------------------------------------------------------------------------------------------------------------------
Tenaris Global Services Korea               Korea              Marketing of steel products      100%     100%    100%
--------------------------------------------------------------------------------------------------------------------------
Tenaris Global Services LLC                 U.S.A.             Sales agent of steel products    100%     100%    100%
--------------------------------------------------------------------------------------------------------------------------
Tenaris Global Services Nigeria Ltd.        Nigeria            Marketing of steel products      100%     100%    100%
(Previously Tubular DST Nigeria Ltd.)
--------------------------------------------------------------------------------------------------------------------------
Tenaris Global Services Norway AS           Norway             Marketing of steel products      100%     100%    100%
--------------------------------------------------------------------------------------------------------------------------
Tenaris Global Services (Panama) S.A.       Panama             Marketing of steel products      100%     100%    100%
--------------------------------------------------------------------------------------------------------------------------
Tenaris Global Services S.A.                Uruguay            Holding company and marketing    100%     100%    100%
                                                               of steel products
--------------------------------------------------------------------------------------------------------------------------
Tenaris Global Services (UK) Ltd.           United Kingdom     Marketing of steel products      100%     100%    100%
--------------------------------------------------------------------------------------------------------------------------
Tenaris Global Services (U.S.A.)            U.S.A.             Marketing of steel products      100%     100%    100%
Corporation
--------------------------------------------------------------------------------------------------------------------------
Tenaris Investments Ltd. (a)                Ireland            Holding company                  100%     100%      -
--------------------------------------------------------------------------------------------------------------------------
Tenaris Qingdao Steel Pipes Ltd. (b)        China              Manufacturing of steel pipes     100%      -        -
                                                               and connections
--------------------------------------------------------------------------------------------------------------------------
Tenaris West Africa Ltd.                    United Kingdom     Finishing of steel pipes         100%     100%    100%
--------------------------------------------------------------------------------------------------------------------------
Texas Pipe Threaders Co.                    U.S.A.             Finishing and marketing of       100%     100%    100%
                                                               steel pipes
--------------------------------------------------------------------------------------------------------------------------




                                      -50-



Tenaris S.A. Consolidated  financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------





--------------------------------------------------------------------------------------------------------------------------
                                                                                                      
                 Company                       Country of             Main activity           Percentage of ownership
                                               Organization                                        at December 31,
--------------------------------------------------------------------------------------------------------------------------
                                                                                                2005     2004    2003
--------------------------------------------------------------------------------------------------------------------------
Tubman Holdings (Gibraltar) LLP (a)         Gibraltar          Holding company                  100%     100%      -
--------------------------------------------------------------------------------------------------------------------------
Tubman International Ltd. (a)               Gibraltar          Holding company                  100%     100%      -
--------------------------------------------------------------------------------------------------------------------------
Tubos de Acero de Mexico S.A.               Mexico             Manufacturing of seamless        100%     100%    100%
                                                               steel pipes
--------------------------------------------------------------------------------------------------------------------------
Tubos de Acero de Venezuela S.A.            Venezuela          Manufacturing of seamless        70%      70%      70%
                                                               steel pipes
--------------------------------------------------------------------------------------------------------------------------




(a)  Incorporated or acquired during 2004
(b)  Incorporated or acquired during 2005
(c)  Tenaris holds 99% of the voting shares of Confab  Industrial  S.A. and has,
     directly  or  indirectly,  the  majority  of  voting  rights  in all of its
     subsidiaries.
(d)  Included in December 2003 in "Information Systems and technologies N.V. and
     subsidiaries" and in December 2004 in "Invertub S.A. and subsidiaries"
(e)  Included in December 2004 in "Insirger S.A. and subsidiaries"
(f)  Included in December 2004 in "Tamsider S.A. de C.V. and subsidiaries"
(g)  Merged during 2005
(h)  Included  in  December   2003  and  2004  in  "Dalmine   Holding  B.V.  and
     subsidiaries"




                                               Carlos Condorelli
                                            Chief Financial Officer


                                      -51-



Tenaris S.A. Consolidated  financial statements for the years ended December 31,
2005, 2004 and 2003
--------------------------------------------------------------------------------


Report of Independent Registered Public Accounting Firm


To the Board of Directors and Shareholders of
Tenaris S.A.


In our opinion,  the  accompanying  consolidated  balance sheets and the related
consolidated  statements  of  income,  of cash  flows and of  changes  in equity
present fairly, in all material respects, the financial position of Tenaris S.A.
and its  subsidiaries  at December  31, 2005 and 2004,  and the results of their
operations  and their cash flows for each of the three years in the period ended
December  31,  2005  in  conformity  with  International   Financial   Reporting
Standards.  These financial  statements are the  responsibility of the Company's
management.  Our  responsibility  is to express  an  opinion on these  financial
statements  based on our audits.  We conducted our audits of these statements in
accordance with the standards of the Public Company  Accounting  Oversight Board
(United States).  Those standards  require that we plan and perform the audit to
obtain reasonable  assurance about whether the financial  statements are free of
material  misstatement.  An audit includes examining,  on a test basis, evidence
supporting the amounts and  disclosures in the financial  statements,  assessing
the accounting principles used and significant estimates made by management, and
evaluating the overall  financial  statement  presentation.  We believe that our
audits provide a reasonable basis for our opinion.


Buenos Aires, March 1, 2006

PRICE WATERHOUSE & CO. S.R.L.

by                              (Partner)
-----------------------------------------
          Daniel A. Lopez Lado


                                      -52-























                                    SIGNATURE




Pursuant  to the  requirements  of the  Securities  Exchange  Act of  1934,  the
Registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned, thereunto duly authorized.



Date: March 6, 2006




                                  Tenaris, S.A.




By: /s/ Cecilia Bilesio
-----------------------
Cecilia Bilesio
Corporate Secretary