UNITED STATES
                         SECURITIES EXCHANGE COMMISSION
                             Washington, D.C. 20549

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

                                  SCHEDULE 13D
                    Under the Securities Exchange Act of 1934
                               (Amendment No. 1)*

                         QUANTA CAPITAL HOLDINGS LIMITED
                         -------------------------------
                                (Name of Issuer)

                     Common Stock, $0.01 par value per share
                -------------------------------------------------
                         (Title of Class of Securities)

                                    G7313F106
                              --------------------
                                 (CUSIP Number)

                                 Brad Huntington
                       Brevan Howard P&C Partners Limited
                               12 Bermudiana Road
                                    3rd Floor
                                 Hamilton, HMAX
                                     Bermuda
                                  +14412929774
                           ---------------------------
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                December 6, 2007
                         ------------------------------
             (Date of Event which Requires Filing of this Statement)


If the filing Persons has previously filed a statement on Schedule 13G to report
the  acquisition  that is the subject of this  Schedule  13D, and is filing this
statement because of ss.ss.240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the
following box. [ ]

Note:  Schedules  filed in paper format shall include a signed original and five
copies of the  schedule,  including  all exhibits.  See  ss.240.13d-7  for other
parties to whom copies are to be sent.

* The remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for any  subsequent  amendment  containing  information  which  would  alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).





                                  SCHEDULE 13D/A

CUSIP No.: G7313F106                                          Page 2 of 10 Pages


.................................................................................
1.     Names of Reporting Persons.

       I.R.S. Identification Nos. of above persons (entities only).


       BREVAN HOWARD P&C PARTNERS LIMITED
.................................................................................
2.     Check the Appropriate Box if a Member of a Group (See Instructions)

       (a) [  ]
       (b) [  ]
.................................................................................
3.     SEC Use Only
.................................................................................
4.     Source of Funds (See Instructions)

       WC
.................................................................................
5.     Check if Disclosure of Legal  Proceedings  is Required  Pursuant to Items
       2(d) or 2(e)

       [  ]
.................................................................................
6.     Citizenship or Place of Organization

       CAYMAN ISLANDS
.................................................................................
Number of           7.     Sole Voting Power             None
Shares             .............................................................
Beneficially        8.     Shared Voting Power           6,385,045
Owned by Each      .............................................................
Reporting           9.     Sole Dispositive Power        None
Persons With       .............................................................
                    10.    Shared Dispositive Power      6,385,045
.................................................................................
11.    Aggregate Amount Beneficially Owned by Each Reporting Person

       6,385,045
.................................................................................
12.    Check if the Aggregate  Amount in Row (11) Excludes  Certain  Shares (See
       Instructions)

       [  ]
.................................................................................
13.    Percent of Class Represented by Amount in Row (11)

       9.1% based on 70,133,499 shares outstanding as of November 1, 2007.
.................................................................................
14.    Type of Reporting Person:

       PN





                                  SCHEDULE 13D/A

CUSIP No.: G7313F106                                          Page 3 of 10 Pages

.................................................................................
1.     Names of Reporting Persons.

       I.R.S. Identification Nos. of above persons (entities only).


       ARMOUR GROUP HOLDINGS LIMITED
.................................................................................
2.     Check the Appropriate Box if a Member of a Group (See Instructions)

       (a) [  ]
       (b) [  ]
.................................................................................
3.     SEC Use Only
.................................................................................
4.     Source of Funds (See Instructions)

       WC
.................................................................................
5.     Check if Disclosure of Legal  Proceedings  is Required  Pursuant to Items
       2(d) or 2(e)


       [  ]
.................................................................................
6.     Citizenship or Place of Organization

       CAYMAN ISLANDS
.................................................................................
Number of           7.     Sole Voting Power             None
Shares             .............................................................
Beneficially        8.     Shared Voting Power           6,385,045
Owned by Each      .............................................................
Reporting           9.     Sole Dispositive Power        None
Persons With       .............................................................
                    10.    Shared Dispositive Power      6,385,045
.................................................................................
11.    Aggregate Amount Beneficially Owned by Each Reporting Person

       6,385,045
.................................................................................
12.    Check if the Aggregate  Amount in Row (11) Excludes  Certain  Shares (See
       Instructions)

       [  ]
.................................................................................
13.    Percent of Class Represented by Amount in Row (11)

       9.1% based on 70,133,499 shares outstanding as of November 1, 2007.
.................................................................................
14.    Type of Reporting Person:

       OO





                                  SCHEDULE 13D/A

CUSIP No.: G7313F106                                          Page 4 of 10 Pages

.................................................................................
1.     Names of Reporting Persons.

       I.R.S. Identification Nos. of above persons (entities only).


       BREVAN HOWARD P&C MASTER FUND LIMITED
.................................................................................
2.     Check the Appropriate Box if a Member of a Group (See Instructions)

       (a) [  ]
       (b) [  ]
.................................................................................
3.     SEC Use Only
.................................................................................
4.     Source of Funds (See Instructions)

       WC
.................................................................................
5.     Check if Disclosure of Legal  Proceedings  is Required  Pursuant to Items
       2(d) or 2(e)

       [  ]
.................................................................................
6.     Citizenship or Place of Organization

       CAYMAN ISLANDS
.................................................................................
Number of           7.     Sole Voting Power             None
Shares             .............................................................
Beneficially        8.     Shared Voting Power           6,385,045
Owned by Each      .............................................................
Reporting           9.     Sole Dispositive Power        None
Persons With       .............................................................
                    10.    Shared Dispositive Power      6,385,045
.................................................................................
11.    Aggregate Amount Beneficially Owned by Each Reporting Person

       6,385,045
.................................................................................
12.    Check if the Aggregate  Amount in Row (11) Excludes  Certain  Shares (See
       Instructions)

       [  ]
.................................................................................
13.    Percent of Class Represented by Amount in Row (11)

       9.1% based on 70,133,499 shares outstanding as of November 1, 2007.
.................................................................................
14.    Type of Reporting Person:

       OO





                                  SCHEDULE 13D/A

CUSIP No.: G7313F106                                          Page 5 of 10 Pages

.................................................................................
1.     Names of Reporting Persons.

       I.R.S. Identification Nos. of above persons (entities only).


       BRAD HUNTINGTON
.................................................................................
2.     Check the Appropriate Box if a Member of a Group (See Instructions)

       (a) [  ]
       (b) [  ]
.................................................................................
3.     SEC Use Only
.................................................................................
4.     Source of Funds (See Instructions)

       WC
.................................................................................
5.     Check if Disclosure of Legal  Proceedings  is Required  Pursuant to Items
       2(d) or 2(e)

       [  ]
.................................................................................
6.     Citizenship or Place of Organization

       CANADA
.................................................................................
Number of           7.     Sole Voting Power             None
Shares             .............................................................
Beneficially        8.     Shared Voting Power           6,385,045
Owned by Each      .............................................................
Reporting           9.     Sole Dispositive Power        None
Persons With       .............................................................
                    10.    Shared Dispositive Power      6,385,045
.................................................................................
11.    Aggregate Amount Beneficially Owned by Each Reporting Person

       6,385,045
.................................................................................
12.    Check if the Aggregate  Amount in Row (11) Excludes  Certain  Shares (See
       Instructions)

       [  ]
.................................................................................
13.    Percent of Class Represented by Amount in Row (11)

       9.1% based on 70,133,499 shares outstanding as of November 1, 2007.
.................................................................................
14.    Type of Reporting Person:

       IN





                                                              Page 6 of 10 Pages


            Pursuant  to Rule 13d-2  promulgated  under the Act,  this  Schedule
13D/A (this  "Amendment  No. 1") amends the  Schedule  13D filed on November 13,
2007 (the "Original  Schedule 13D" and,  together with this Amendment No. 1, are
collectively  referred to herein as the "Schedule  13D").  This  Amendment No. 1
amends and  supplements  the  Original  Schedule 13D filed on November 13, 2007.
Information  reported in the Original  Schedule 13D remains in effect  except to
the extent that is is amended,  restated, or superseded by information contained
in this Amendment No. 1. This  Amendment No. 1 relates to the common stock,  par
value $0.01 per share, of Quanta Capital Holdings Limited, a Bermuda corporation
(the "Issuer"). Unless the context otherwise requires,  references herein to the
"Common  Stock" are to such common  stock of the Issuer.  This  Schedule  13D is
being  filed by the  Reporting  Persons to report that the number of Shares that
the Reporting  Persons may be deemed to  beneficially  own has increased by more
than one percent of the current outstanding Shares, as disclosed in the Issuer's
quarterly  report on Form 10-Q that was filed on November  9, 2007.  Capitalized
terms used by not defined herein shall have the meaning  ascribed to them in the
Initial Statement.

Item 3.       Source and Amount of Funds or Other Consideration

              Item 3 of  Schedule  13D is hereby  amended  and  restated  in its
entirety as follows:

              The Shares  covered by this  Schedule  13D were  purchased  by the
Reporting   Persons  between   November  9,  2007  and  December  12,  2007  for
approximately  $5,252,220.  The  source  of  funds  for the  purchases  was cash
available for investment held by the Reporting Persons.




                                                              Page 7 of 10 Pages

Item 5.       Interest in Securities of the Issuer

              Item 5 of  Schedule  13D is hereby  amended  and  restated  in its
entirety as follows:

              According to  information  filed by the Issuer with the Securities
and Exchange  Commission,  the number of Shares outstanding was 70,133,499 as of
November 1, 2007.

              (a)  Each of BH P&C  Partners,  Armour,  P&C  Master  Fund and Mr.
Huntington may be deemed the beneficial owner of 6,385,045 Shares (approximately
9.1% of the total number of Shares outstanding).

              (b) (i) BH P&C  Partners  may be  deemed to have  shared  power to
direct the voting  and  disposition  of the  6,385,045  Shares  that they may be
deemed to beneficially own as set forth above.

                  (ii) Mr.  Huntington, Armour and P&C Master Fund may be deemed
to have  shared  power to direct  the voting and  disposition  of the  6,385,045
Shares  that BH P&C  Partners  may be  deemed to  beneficially  own as set forth
above.

              (c) Information concerning  transactions in the Shares effected by
the Reporting Persons since the filing of the Original Schedule 13D is set forth
in Schedule A and is incorporated by reference.  Except for the  transactions by
the Brevan Howard  Reporting  Persons set forth on Schedule A hereto,  since the
filing of the  Original  Schedule 13D there were no  transactions  in the Shares
effected by BH P&C Partners,  Armour, P&C Master Fund, and Mr. Huntington,  nor,
to the best of the knowledge of the by BH P&C Partners, Armour, P&C Master Fund,
and Mr.  Huntington,  any of the BH P&C  Partners,  Armour,  P&C  Master  Funds'
executive  officers  or members.  All of the  transactions  in Shares  listed on
Schedule  A  hereto  were  effected  in the open  market  in  routine  brokerage
transactions.

              (d) Not applicable.

              (e) Not applicable.





                                                              Page 8 of 10 Pages


Item 7.       Material to be filed as Exhibits.

              The Exhibit Index is incorporated herein by reference.





                                                              Page 9 of 10 Pages


                                    SIGNATURE

     After  reasonable  inquiry and to the best of my  knowledge  and belief,  I
certify that the information  set forth in this statement is true,  complete and
correct.

Date: December 12, 2007                 BREVAN HOWARD P&C PARTNERS LIMITED


                                        By:
                                           /s/ Brad Huntington
                                           ------------------------------
                                        Name:  Brad Huntington
                                        Title: Director


Date: December 12, 2007                 ARMOUR GROUP HOLDINGS LIMITED


                                        By:
                                           /s/ Brad Huntington
                                           ------------------------------
                                        Name:  Brad Huntington
                                        Title: Director


Date: December 12, 2007                 BREVAN HOWARD P&C MASTER FUND LIMITED


                                        By:
                                           /s/ Brad Huntington
                                           ------------------------------
                                        Name:  Brad Huntington
                                        Title: Director


Date: December 12, 2007                 BRAD HUNTINGTON


                                        By:
                                           /s/ Brad Huntington
                                           ------------------------------
                                        Name:  Brad Huntington





                                                             Page 10 of 10 Pages


                                     ANNEX A

                    RECENT TRANSACTIONS IN THE SECURITIES OF
                         QUANTA CAPITAL HOLDINGS LIMITED




----------------------------- ----------------------------- ----------------------- ----------------------
Date of Transaction           Nature of Transaction         Number of Shares        Price per Share
----------------------------- ----------------------------- ----------------------- ----------------------
                                                                                   
         11/20/2007                     PURCHASE                           421,000          $2.77
----------------------------- ----------------------------- ----------------------- ----------------------
         11/30/2007                     PURCHASE                            86,000          $2.75
----------------------------- ----------------------------- ----------------------- ----------------------
         12/04/2007                     PURCHASE                            10,000          $2.78
----------------------------- ----------------------------- ----------------------- ----------------------
         12/05/2007                     PURCHASE                         1,300,000          $2.78
----------------------------- ----------------------------- ----------------------- ----------------------
         12/07/2007                     PURCHASE                            75,000          $2.77
----------------------------- ----------------------------- ----------------------- ----------------------