SECURITIES & EXCHANGE COMMISSION
                             Washington, D.C. 20549
                             ----------------------

                                 SCHEDULE 13D/A*

                                (Amendment No. 1)

                                 GSI GROUP INC.
             ------------------------------------------------------
                                (Name of Issuer)

                                  COMMON STOCK
             ------------------------------------------------------
                         (Title of Class of Securities))

                                    36229U102
             ------------------------------------------------------
                                 (CUSIP NUMBER)

                                   John Oliva
                       Highbridge Capital Management, LLC
                         9 West 57th Street, 27th Floor
                            New York, New York 10019
             ------------------------------------------------------
                  (Name, address and telephone number of person
                authorized to receive notices and communications)

                                November 19, 2009
             ------------------------------------------------------
            (Date of event which requires filing of this statement))

     If the filing person has previously filed a statement on Schedule 13G to
report the acquisition which is the subject of this Schedule 13D, and is filing
this schedule because of Rule 13d-1(e), 13d-1(f) or 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 Rule 13d-7 for other
parties to whom copies are to be sent.

                         (Continued on following pages)

                               (Page 1 of 7 Pages)

-------------------------------------------------------------------------------
     (1)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 purposes 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).





CUSIP No. 36229U102                 13D/A                         Page 1 of 7


-------------------------------------------------------------------------------
     (1) NAME OF REPORTING PERSONS

         Highbridge Capital Management, LLC
-------------------------------------------------------------------------------
     (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                                  (a)  [ ]
                                                                  (b)  [X]
-------------------------------------------------------------------------------
     (3) SEC USE ONLY
-------------------------------------------------------------------------------
     (4) SOURCE OF FUNDS
         OO
-------------------------------------------------------------------------------
     (5) CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
         REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)                       [ ]
-------------------------------------------------------------------------------
     (6) CITIZENSHIP OR PLACE OF ORGANIZATION
               Delaware
-------------------------------------------------------------------------------
NUMBER OF      (7)  SOLE VOTING POWER
                    -0-
SHARES         ----------------------------------------------------------------

BENEFICIALLY   (8)  SHARED VOTING POWER
                    1,325,136 shares of Common Stock
OWNED BY       ----------------------------------------------------------------

EACH           (9)  SOLE DISPOSITIVE POWER
                    -0-
REPORTING      ----------------------------------------------------------------

PERSON WITH    (10) SHARED DISPOSITIVE POWER
                    1,325,136 shares of Common Stock
-------------------------------------------------------------------------------
     (11)    AGGREGATE AMOUNT BENEFICIALLY OWNED
             BY EACH REPORTING PERSON
             1,325,136 shares of Common Stock
-------------------------------------------------------------------------------
     (12)    CHECK BOX IF THE AGGREGATE AMOUNT
             IN ROW (11) EXCLUDES CERTAIN SHARES **                       [ ]
-------------------------------------------------------------------------------
     (13)    PERCENT OF CLASS REPRESENTED
             BY AMOUNT IN ROW (11)
             2.8% (See Item 4)
-------------------------------------------------------------------------------
     (14)    TYPE OF REPORTING PERSON
             OO
-------------------------------------------------------------------------------





CUSIP No. 36229U102                 13D/A                         Page 2 of 7


     (1) NAME OF REPORTING PERSONS

         Highbridge International LLC
-------------------------------------------------------------------------------
     (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                                  (a)  [ ]
                                                                  (b)  [X]
-------------------------------------------------------------------------------
     (3) SEC USE ONLY
-------------------------------------------------------------------------------
     (4) SOURCE OF FUNDS
         WC
-------------------------------------------------------------------------------
     (5) CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
         REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)                       [ ]
-------------------------------------------------------------------------------
     (6) CITIZENSHIP OR PLACE OF ORGANIZATION
         Cayman Islands, British West Indies
-------------------------------------------------------------------------------
NUMBER OF      (7)  SOLE VOTING POWER
                    -0-
SHARES         ----------------------------------------------------------------

BENEFICIALLY   (8)  SHARED VOTING POWER
                    1,325,136 shares of Common Stock
OWNED BY       ----------------------------------------------------------------

EACH           (9)  SOLE DISPOSITIVE POWER
                    -0-
REPORTING      --------------------------------------------------------------

PERSON WITH    (10) SHARED DISPOSITIVE POWER
                    1,325,136 shares of Common Stock
-------------------------------------------------------------------------------
     (11)    AGGREGATE AMOUNT BENEFICIALLY OWNED
             BY EACH REPORTING PERSON
             1,325,136 shares of Common Stock
-------------------------------------------------------------------------------
     (12)    CHECK BOX IF THE AGGREGATE AMOUNT
             IN ROW (11) EXCLUDES CERTAIN SHARES                        [ ]
-------------------------------------------------------------------------------
     (13)    PERCENT OF CLASS REPRESENTED
             BY AMOUNT IN ROW (11)
             2.8% (See Item 4)
-------------------------------------------------------------------------------
     (14)    TYPE OF REPORTING PERSON
             OO
-------------------------------------------------------------------------------





CUSIP No. 36229U102                 13D/A                         Page 3 of 7


     (1) NAME OF REPORTING PERSONS

         Glenn Dubin
-------------------------------------------------------------------------------
     (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                                  (a)  [ ]
                                                                  (b)  [X]
-------------------------------------------------------------------------------
     (3) SEC USE ONLY
-------------------------------------------------------------------------------
     (4) SOURCE OF FUNDS
         OO
-------------------------------------------------------------------------------
     (5) CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
         REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)                       [ ]
-------------------------------------------------------------------------------
     (6) CITIZENSHIP OR PLACE OF ORGANIZATION
         United States
-------------------------------------------------------------------------------
NUMBER OF      (7)  SOLE VOTING POWER
                    -0-
SHARES         ----------------------------------------------------------------

BENEFICIALLY   (8)  SHARED VOTING POWER
                    1,325,136 shares of Common Stock
OWNED BY       ----------------------------------------------------------------

EACH           (9)  SOLE DISPOSITIVE POWER
                    -0-
REPORTING      ----------------------------------------------------------------

PERSON WITH    (10) SHARED DISPOSITIVE POWER
                    1,325,136 shares of Common Stock
-------------------------------------------------------------------------------
     (11)    AGGREGATE AMOUNT BENEFICIALLY OWNED
             BY EACH REPORTING PERSON
             1,325,136 shares of Common Stock
-------------------------------------------------------------------------------
     (12)    CHECK BOX IF THE AGGREGATE AMOUNT
             IN ROW (11) EXCLUDES CERTAIN SHARES                        [ ]
-------------------------------------------------------------------------------
     (13)    PERCENT OF CLASS REPRESENTED
             BY AMOUNT IN ROW (11)
             2.8% (See Item 4)
-------------------------------------------------------------------------------
     (14)    TYPE OF REPORTING PERSON
             IN
-------------------------------------------------------------------------------





CUSIP No. 36229U102                 13D/A                         Page 4 of 7


Item 1.     Security and Issuer.

This  Amendment  No. 1 (the  "Amendment")  amends the  statement on Schedule 13D
filed on July 2, 2009 (the "Original  Schedule  13D", as amended,  the "Schedule
13D") with respect to the common stock,  no par value (the "Common  Stock"),  of
GSI Group Inc., a company  continued and existing under the laws of the Province
of New Brunswick, Canada (the "Company "). Capitalized terms used herein and not
otherwise  defined in this Amendment have the meanings set forth in the Original
Schedule 13D. This Amendment amends Items 4, 6 and 7 as set forth below.

Item 4.     Purpose of the Transaction.

     Item 4 of the  Schedule  13D is  hereby  amended  and  supplemented  by the
addition of the following:

     On November 19, 2009, Highbridge International LLC and certain of the other
Noteholders   (the   "Consenting   Noteholders")   entered   into  a  Noteholder
Restructuring  Plan Support  Agreement (the "Plan Support  Agreement")  with the
Company,  the  Subsidiary  and  certain  of their  subsidiaries  and  affiliates
(together, the "Company Parties"), under which the parties thereto agreed to the
terms  of a  restructuring  of the  Notes  pursuant  to a  chapter  11  plan  of
reorganization,  the terms of which are substantially similar to those set forth
in the Term Sheet.  The commitment to support the  restructuring  is contingent,
among other  things,  upon receipt of a  bankruptcy  court  approved  Disclosure
Statement  (as defined in the Plan  Support  Agreement)  and other  solicitation
materials in support of the Plan.

     Pursuant to the Plan  Support  Agreement,  the  Noteholders  party  thereto
agreed, among other things subject to certain exceptions, (i) to vote all claims
or shares it holds or asserts  against the Company  Parties in favor of the Plan
(as defined in the Plan Support  Agreement),  (ii) not to object to confirmation
of the Plan or object to or otherwise commence any proceeding to oppose or alter
the Plan or support an alternative  plan,  and (iii) not to withdraw,  change or
revoke its vote with respect to the Plan,  except as  otherwise  provided in the
Plan  Support  Agreement,  and (iv) except as  otherwise  permitted  in the Plan
Support Agreement, not to take any other action that would materially prevent or
delay the  consummation  of the  restructuring  contemplated by the Plan Support
Agreement.

     The Plan Support Agreement is subject to termination upon the occurrence of
certain events, including,  without limitation,  (i) at the option of 66 2/3% of
Consenting  Noteholders  (the "Required  Noteholders"),  upon the failure of the
Company Parties to take certain actions by specified  milestone  dates,  (ii) at
the option of the Company Parties or the Required Noteholders, if the bankruptcy
court  grants  relief  that is  materially  inconsistent  with the Plan  Support
Agreement or the Plan or (iii) at the option of the Required  Noteholders,  upon
the  occurrence  of a Material  Adverse  Change (as defined in the Plan  Support
Agreement).

     This  description  of the Plan  Support  Agreement is a summary only and is
qualified in its entirety by reference to the Plan Support Agreement,  a copy of
which is referenced as Exhibit 7 hereto (which incorporates by reference Exhibit
10.1 of the  Current  Report on Form 8-K filed by the  Company on  November  20,
2009) and is incorporated herein by reference.

     As more  fully  described  in the Plan,  under  the Plan the Notes  will be
exchanged for,  among other things,  New Senior Secured Notes (as defined in the
Plan) and common stock of the reorganized Company.  This description of the Plan




CUSIP No. 36229U102                 13D/A                         Page 5 of 7


is a summary  only and is  qualified in its entirety by reference to the Plan, a
copy of which was filed as Exhibit A of Exhibit  10.1 of the  Current  Report on
Form 8-K filed by the Company on November 20, 2009.

     In  addition,  the 10th  paragraph  of Item 4 of the Schedule 13D is hereby
amended to add the following:

The  Reporting  Persons  and  certain  of the other  Noteholders  (the  "Jointly
Represented Noteholders") have jointly retained counsel in connection with their
respective  investments  in the Notes to  negotiate  on  behalf  of the  Jointly
Represented  Noteholders in connection with the restructuring of the Notes. Each
Jointly Represented  Noteholder will make an independent  decision regarding any
proposal to or from the Company relating to its investment in the Notes.

Item 6.     Contracts, Arrangements, Understandings or
            Relationships with Respect to Securities of the Issuer.

Item 6 of the Schedule 13D is hereby amended and supplemented by the addition of
the following:

As described in Item 4 above,  on November 19, 2009, the Consenting  Noteholders
entered into the Plan Support  Agreement with the Company  Parties,  under which
the parties thereto agreed to the terms of a restructuring of the Notes pursuant
to a chapter 11 plan of  reorganization a copy of which is referenced as Exhibit
7 hereto (which  incorporates by reference Exhibit 10.1 of the Current Report on
Form 8-K filed by the Company on November 20, 2009) and is  incorporated  herein
by reference.

Item 7.     Materials to be Filed as Exhibits.

Item 7 of the Schedule 13D is hereby amended and supplemented by the addition of
the following:

7. Noteholder  Restructuring  Plan Support  Agreement,  dated as of November 19,
2009,  by  and  among  the  Consenting   Noteholders  and  the  Company  Parties
(incorporated  by reference  to Exhibit  10.1 to the Current  Report on Form 8-K
filed by the Company on November 20, 2009).





CUSIP No. 36229U102                 13D/A                         Page 6 of 7

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:  November 20, 2009

HIGHBRIDGE INTERNATIONAL LLC                 HIGHBRIDGE CAPITAL MANAGEMENT, LLC

By: Highbridge Capital Management, LLC
    its Trading Manager                      By: /s/ John Oliva
                                             ----------------------------------
                                             Name: John Oliva
                                             Title: Managing Director
By: /s/ John Oliva
--------------------------------
Name: John Oliva
Title: Managing Director




/s/ Glenn Dubin
--------------------------------
GLENN DUBIN