SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

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

                                 SCHEDULE 13G/A
                                 (Rule 13d-102)


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

    INFORMATION TO BE INCLUDED IN STATEMENTS PURSUANT TO RULES 13d-1(b), (c)
        AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO 13d-2 UNDER THE
                        SECURITIES EXCHANGE ACT OF 1934

                                (Amendment No. 1)

                           O2Micro International Ltd.
                                (Name of Issuer)

                                  Common Stock
                         (Title of Class of Securities)

                                    67107W100
                                 (CUSIP Number)

                                December 31, 2009
             (Date of Event Which Requires Filing of this Statement)

        Check the appropriate box to designate the rule pursuant to which this
Schedule is filed:

        [ ] Rule 13d-1(b)

        [X] Rule 13d-1(c)

        [ ] Rule 13d-1(d)

-----------

        * 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 13G/A

CUSIP No. 67107W100                                                PAGE 2 OF 11


--------------------------------------------------------------------------------
(1)     NAME OF REPORTING PERSON
        S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                                    Polar Securities Inc.
--------------------------------------------------------------------------------
(2)     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                                   (a) [X]
                                                                   (b) [ ]
--------------------------------------------------------------------------------
(3)     SEC USE ONLY
--------------------------------------------------------------------------------
(4)     CITIZENSHIP OR PLACE OF ORGANIZATION
                                     Canada
--------------------------------------------------------------------------------

NUMBER OF      (5)    SOLE VOTING POWER
                                   -0-
SHARES                ----------------------------------------------------------

BENEFICIALLY   (6)    SHARED VOTING POWER
                                  654,823
OWNED BY              ----------------------------------------------------------

EACH           (7)    SOLE DISPOSITIVE POWER
                                   -0-
REPORTING             ----------------------------------------------------------

PERSON WITH    (8)    SHARED DISPOSITIVE POWER
                                  654,823
--------------------------------------------------------------------------------
        (9)    AGGREGATE AMOUNT BENEFICIALLY OWNED
               BY EACH REPORTING PERSON
                                  654,823
--------------------------------------------------------------------------------
        (10)  CHECK BOX IF THE AGGREGATE AMOUNT
              IN ROW (9) EXCLUDES CERTAIN SHARES                       [ ]
--------------------------------------------------------------------------------
        (11)  PERCENT OF CLASS REPRESENTED
              BY AMOUNT IN ROW (9)
                                     1.8%
--------------------------------------------------------------------------------
        (12)  TYPE OF REPORTING PERSON
                                      IA
--------------------------------------------------------------------------------





Schedule 13G/A

CUSIP No. 67107W100                                                PAGE 3 OF 11


--------------------------------------------------------------------------------
(1)     NAME OF REPORTING PERSON
        S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                                    Altairis Offshore
--------------------------------------------------------------------------------
(2)     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                                   (a) [X]
                                                                   (b) [ ]
--------------------------------------------------------------------------------
(3)     SEC USE ONLY
--------------------------------------------------------------------------------
(4)     CITIZENSHIP OR PLACE OF ORGANIZATION
                                     Cayman Islands
--------------------------------------------------------------------------------

NUMBER OF      (5)    SOLE VOTING POWER
                                   -0-
SHARES                ----------------------------------------------------------

BENEFICIALLY   (6)    SHARED VOTING POWER
                                  138,415
OWNED BY              ----------------------------------------------------------

EACH           (7)    SOLE DISPOSITIVE POWER
                                   -0-
REPORTING             ----------------------------------------------------------

PERSON WITH    (8)    SHARED DISPOSITIVE POWER
                                  138,415
--------------------------------------------------------------------------------
        (9)    AGGREGATE AMOUNT BENEFICIALLY OWNED
               BY EACH REPORTING PERSON
                                  138,415
--------------------------------------------------------------------------------
        (10)  CHECK BOX IF THE AGGREGATE AMOUNT
              IN ROW (9) EXCLUDES CERTAIN SHARES                       [ ]
--------------------------------------------------------------------------------
        (11)  PERCENT OF CLASS REPRESENTED
              BY AMOUNT IN ROW (9)
                                     .4%
--------------------------------------------------------------------------------
        (12)  TYPE OF REPORTING PERSON
                                      CO
--------------------------------------------------------------------------------





Schedule 13G/A

CUSIP No. 67107W100                                                PAGE 4 OF 11


--------------------------------------------------------------------------------
(1)     NAME OF REPORTING PERSON
        S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                                    Altairis Offshore Levered
--------------------------------------------------------------------------------
(2)     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                                   (a) [X]
                                                                   (b) [ ]
--------------------------------------------------------------------------------
(3)     SEC USE ONLY
--------------------------------------------------------------------------------
(4)     CITIZENSHIP OR PLACE OF ORGANIZATION
                                     Cayman Islands
--------------------------------------------------------------------------------

NUMBER OF      (5)    SOLE VOTING POWER
                                   -0-
SHARES                ----------------------------------------------------------

BENEFICIALLY   (6)    SHARED VOTING POWER
                                  516,408
OWNED BY              ----------------------------------------------------------

EACH           (7)    SOLE DISPOSITIVE POWER
                                   -0-
REPORTING             ----------------------------------------------------------

PERSON WITH    (8)    SHARED DISPOSITIVE POWER
                                  516,408
--------------------------------------------------------------------------------
        (9)    AGGREGATE AMOUNT BENEFICIALLY OWNED
               BY EACH REPORTING PERSON
                                  516,408
--------------------------------------------------------------------------------
        (10)  CHECK BOX IF THE AGGREGATE AMOUNT
              IN ROW (9) EXCLUDES CERTAIN SHARES                       [ ]
--------------------------------------------------------------------------------
        (11)  PERCENT OF CLASS REPRESENTED
              BY AMOUNT IN ROW (9)
                                     1.4%
--------------------------------------------------------------------------------
        (12)  TYPE OF REPORTING PERSON
                                      CO
--------------------------------------------------------------------------------





Schedule 13G/A

CUSIP No. 67107W100                                                PAGE 5 OF 11

ITEM 1(a).     NAME OF ISSUER:

               O2Micro International Ltd (the "Company")

ITEM 1(b).     ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:

               Grand Pavillion Commercial Centre
               West Bay Road
               PO Box 32331
               SMB George Town, Grand Cayman

ITEMS 2(a), 2(b) and 2(c).   NAME OF PERSON FILING, ADDRESS OF PRINCIPAL
BUSINESS OFFICE AND CITIZENSHIP:

     This statement is filed by the entities and persons listed below, all of
whom together are referred to herein as the "Reporting Persons":

         (i)   Altairis Offshore, a Cayman Islands exempted company, with
               respect to the Shares (defined in item 2(d) below)
               reported in this Schedule 13G/A directly owned by it.

         (ii)  Altairis Offshore Levered, a Cayman Islands exempted
               company, with respect to the Shares reported in this
               Schedule 13G/A directly owned by it.

         (iii) Polar Securities Inc. ("Polar Securities"), a company
               incorporated under the laws on Ontario, Canada, with
               respect to the Shares reported in this Schedule 13G/A
               directly owned by Altairis Offshore and Altairis Offshore
               Levered.

The citizenship of each of the Reporting Persons is set forth above.

The address of the principal business office of each of the Reporting Persons is
372 Bay Street, 21st floor, Toronto, Ontario M5H 2W9, Canada.

ITEM 2(d).  TITLE OF CLASS OF SECURITIES:  common stock (the "Shares")

ITEM 2(e).  CUSIP NUMBER:  67107W100






Schedule 13G/A

CUSIP No. 67107W100                                                PAGE 6 OF 11


ITEM 3. IF THIS STATEMENT IS FILED PURSUANT TO 13d-1(b) OR 13d-2(b) OR (c),
CHECK WHETHER THE PERSON FILING IS A:

          (a) [ ] Broker or dealer registered under Section 15 of the Act;

          (b) [ ] Bank as defined in Section 3(a)(6) of the Act;

          (c) [ ] Insurance Company as defined in Section 3(a)(19) of the Act;

          (d) [ ] Investment Company registered under Section 8 of the
                  Investment Company Act of 1940;

          (e) [ ] Investment Adviser registered under Section 203 of the
                  Investment Advisers Act of 1940: see Rule 13d-1(b)(1)(ii)(E);

          (f) [ ] Employee Benefit Plan, Pension Fund which is subject to
                  the provisions of the Employee Retirement Income Security
                  Act of 1974 or Endowment Fund; see Rule 13d-1(b)(1)(ii)(F);

          (g) [ ] Parent Holding Company, in accordance with Rule
                  13d-1(b)(ii)(G);

          (h) [ ] Savings Associations as defined in Section 3(b) of the
                  Federal Deposit Insurance Act;

          (i) [ ] Church Plan that is excluded from the definition of an
                  investment company under Section 3(c)(14) of the Investment
                  Company Act of 1940;

          (j) [ ] Group, in accordance with Rule 13d-1(b)(1)(ii)(J).

    IF THIS STATEMENT IS FILED PURSUANT TO Rule 13d-1(c), CHECK THIS
BOX. [x]







Schedule 13G/A

CUSIP No. 67107W100                                                PAGE 7 OF 11

ITEM 4.   OWNERSHIP.

      Polar Securities Inc. serves as the investment manager to Altairis
Offshore and Altairis Offshore Levered and has voting and dispositive authority
over the Shares reported in this Schedule 13G/A.

      Each of the Reporting Persons hereby disclaims any beneficial ownership of
any such Shares.

      A. Polar Securities

         (a) Amount beneficially owned: 654,823

         (b) Percent of class: 1.8% (all percentages herein are based on
             37,020,000 Shares believed to be outstanding and reported to be
             outstanding by Bloomberg as of February 4, 2010).

         (c) Number of shares as to which such person has:

             (i)   sole power to vote or to direct the vote: 0 Shares.

             (ii)  shared power to vote or to direct the vote: 654,823 Shares.

             (iii) sole power to dispose or to direct the disposition of: 0
                   Shares.

             (iv)  shared power to dispose or to direct the disposition of:
                   654,823 Shares








Schedule 13G/A

CUSIP No. 67107W100                                                PAGE 8 OF 11


      B. Altairis Offshore

         (a) Amount beneficially owned: 138,415

         (b) Percent of class: .4%

         (c) Number of shares as to which such person has:

             (i)   sole power to vote or to direct the vote: 0 Shares.

             (ii)  shared power to vote or to direct the vote: 138,415 Shares.

             (iii) sole power to dispose or to direct the disposition of: 0
                   Shares.

             (iv)  shared power to dispose or to direct the disposition of:
                   138,415 Shares

      C. Altairis Offshore Levered

         (a) Amount beneficially owned: 516,408

         (b) Percent of class: 1.4%

         (c) Number of shares as to which such person has:

             (i)   sole power to vote or to direct the vote: 0 Shares.

             (ii)  shared power to vote or to direct the vote: 516,408 Shares.

             (iii) sole power to dispose or to direct the disposition of: 0
                   Shares.

             (iv)  shared power to dispose or to direct the disposition of:
                   516,408 Shares






Schedule 13G/A

CUSIP No. 67107W100                                                PAGE 9 OF 11


ITEM 5.  OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS.

         If this statement is being filed to report the fact that as of the date
hereof the reporting person has ceased to be the beneficial owner of more than
five percent of the class of securities, check the following |X|.

ITEM 6.  OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON.

         Not applicable.

ITEM 7.  IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED THE
         SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY.

         Not applicable.

ITEM 8.  IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP

         See Item 4.

ITEM 9.  NOTICE OF DISSOLUTION OF GROUP

         Not applicable.

ITEM 10. CERTIFICATION (if filing pursuant to Rule 13d-1(c))

         Each of the Reporting Persons hereby makes the following certification:

By signing below each Reporting Person certifies that, to the best of its
knowledge and belief, the securities referred to above were not acquired and are
not held for the purpose of or with the effect of changing or influencing the
control of the issuer of the securities and were not acquired and not held in
connection with or as a participant in any transaction having that purpose or
effect.





Schedule 13G/A

CUSIP No. 67107W100                                                PAGE 10 OF 11


                                   SIGNATURES

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


DATED:  February 16, 2010               Polar Securities Inc.
                                        /s/ Paul Sabourin

                                        -----------------------------------
                                        Paul Sabourin
                                        Chief Investment Officer

                                        Altairis Offshore
                                        By:  Polar Securities Inc.
                                        /s/ Paul Sabourin

                                        -----------------------------------
                                        Paul Sabourin
                                        Chief Investment Officer

                                        Altairis Offshore Levered
                                        By:  Polar Securities Inc.
                                        /s/ Paul Sabourin

                                        -----------------------------------
                                        Paul Sabourin
                                        Chief Investment Officer






Schedule 13G/A

CUSIP No. 67107W100                                                PAGE 11 OF 11


                                    EXHIBIT 1
                           JOINT ACQUISITION STATEMENT

                            PURSUANT TO RULE 13d-1(k)

         The undersigned acknowledge and agree that the foregoing statement on
Schedule 13G/A, is filed on behalf of each of the undersigned and that all
subsequent amendments to this statement on Schedule 13G/A, shall be filed on
behalf of each of the undersigned without the necessity of filing additional
joint acquisition statements. The undersigned acknowledge that each shall be
responsible for the timely filing of such amendments, and for the completeness
and accuracy of the information concerning him or it contained therein, but
shall not be responsible for the completeness and accuracy of the information
concerning the others, except to the extent that he or it knows or has reason to
believe that such information is inaccurate.


DATED:  February 16, 2010               Polar Securities Inc.
                                        /s/ Paul Sabourin

                                        -----------------------------------
                                        Paul Sabourin
                                        Chief Investment Officer

                                        Altairis Offshore
                                        By:  Polar Securities Inc.
                                        /s/ Paul Sabourin

                                        -----------------------------------
                                        Paul Sabourin
                                        Chief Investment Officer

                                        Altairis Offshore Levered
                                        By:  Polar Securities Inc.
                                        /s/ Paul Sabourin

                                        -----------------------------------
                                        Paul Sabourin
                                        Chief Investment Officer