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

                                 SCHEDULE 13D/A
                    Under the Securities Exchange Act of 1934

                                (Amendment No. 6)

                                 GSI Group Inc.
--------------------------------------------------------------------------------
                                (Name of Issuer)

                           Common Stock, no par value
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                         (Title of Class of Securities)

                                    36229U102
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                                 (CUSIP Number)

                               Ellen Porges, Esq.
                         Goldman Sachs Asset Management
                                 200 West Street
                               New York, NY 10282
                                  212-902-1000

--------------------------------------------------------------------------------
(Name, Address and Telephone Number of Person Authorized to Receive Notices and
                                 Communications)

                                  May 14, 2010
                               ------------------
             (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 that 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.

--------------------
* 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
disclosures provided in a prior cover page.

The information required on 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).

                          (Continued on following pages)
                               (Page 1 of 7 Pages)







----------------------------                        ----------------------------
CUSIP No.  36229U102            SCHEDULE 13D/A        Page 2 of 7 Pages
----------------------------                        ----------------------------
------------- -----------------------------------------------------------------
     1        NAME OF REPORTING PERSON

              Goldman Sachs Asset Management
              (Goldman Sachs Asset Management,  L.P.,  together  with  GS
              Investment Strategies, LLC, "Goldman Sachs Asset Management")

------------- -----------------------------------------------------------------
     2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) |_|  (b) |X|
------------- -----------------------------------------------------------------
     3        SEC USE ONLY
------------- -----------------------------------------------------------------
     4        SOURCE OF FUNDS

              AF
------------- -----------------------------------------------------------------
     5        CHECK 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

   SHARES                 0
              ----------- -----------------------------------------------------
BENEFICIALLY  8           SHARED VOTING POWER

   OWNED                  1,534,369
              ----------- -----------------------------------------------------
  BY EACH     9           SOLE DISPOSITIVE POWER

 REPORTING                0
              ----------- -----------------------------------------------------
  PERSON      10          SHARED DISPOSITIVE POWER

                          1,534,369
------------- ----------- -----------------------------------------------------
     11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

              1,534,369
------------- -----------------------------------------------------------------
     12       CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
              SHARES |_|
------------- -----------------------------------------------------------------
     13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11

              3.2% (see Item 4)
------------- -----------------------------------------------------------------
     14       TYPE OF REPORTING PERSON
              IA
------------- -----------------------------------------------------------------






----------------------------                        ----------------------------
CUSIP No.  36229U102            SCHEDULE 13D/A        Page 3 of 7 Pages
----------------------------                        ----------------------------
------------- -----------------------------------------------------------------
     1        NAME OF REPORTING PERSON

              Liberty Harbor I GP, LLC

------------- -----------------------------------------------------------------
     2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) |_|  (b) |X|
------------- -----------------------------------------------------------------
     3        SEC USE ONLY
------------- -----------------------------------------------------------------
     4        SOURCE OF FUNDS

              AF
------------- -----------------------------------------------------------------
     5        CHECK 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

   SHARES                 0
              ----------- -----------------------------------------------------
BENEFICIALLY  8           SHARED VOTING POWER

   OWNED                  1,534,369
              ----------- -----------------------------------------------------
  BY EACH     9           SOLE DISPOSITIVE POWER

 REPORTING                0
              ----------- -----------------------------------------------------
  PERSON      10          SHARED DISPOSITIVE POWER

                          1,534,369
------------- ----------- -----------------------------------------------------
     11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

               1,534,369
------------- -----------------------------------------------------------------
     12       CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
              SHARES |_|
------------- -----------------------------------------------------------------
     13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11

              3.2% (see Item 4)
------------- -----------------------------------------------------------------
     14       TYPE OF REPORTING PERSON
              IA
------------- -----------------------------------------------------------------







----------------------------                        ----------------------------
CUSIP No.  36229U102            SCHEDULE 13D/A        Page 4 of 7 Pages
----------------------------                        ----------------------------
------------- -----------------------------------------------------------------
     1        NAME OF REPORTING PERSON

              Liberty Harbor Master Fund I, L.P.

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

   SHARES                 0
              ----------- -----------------------------------------------------
BENEFICIALLY  8           SHARED VOTING POWER

   OWNED                  1,534,369
              ----------- -----------------------------------------------------
  BY EACH     9           SOLE DISPOSITIVE POWER

 REPORTING                0
              ----------- -----------------------------------------------------
  PERSON      10          SHARED DISPOSITIVE POWER

                          1,534,369
------------- ----------- -----------------------------------------------------
     11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

              1,534,369
------------- -----------------------------------------------------------------
     12       CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
              SHARES |_|
------------- -----------------------------------------------------------------
     13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11

              3.2% (see Item 4)
------------- -----------------------------------------------------------------
     14       TYPE OF REPORTING PERSON
              IA
------------- -----------------------------------------------------------------






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

ITEM 1.       SECURITY AND ISSUER

     This Amendment No. 6 (the "Amendment") amends the statement on Schedule 13D
filed on July 2, 2009 (the  "Original  Schedule  13D", as amended  hereby and by
Amendment  No. 1 filed on November 20, 2009,  Amendment  No. 2 filed on March 3,
2010,  Amendment  No. 3 filed on March 16, 2010,  Amendment No. 4 filed on March
19, 2010 and  Amendment No. 5 filed on May 12, 2010,  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  "Issuer").  Capitalized  terms  used  herein  and  not
otherwise  defined in this Amendment have the meanings set forth in the Schedule
13D. This Amendment amends Items 4, 6 and 7 as set forth below.

ITEM 4.       PURPOSE OF TRANSACTION

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

     On May 14, 2010 Liberty Harbor and the other Consenting Noteholders entered
into the  Restructuring  Plan Support  Agreement  with the Issuer  Parties,  the
Equity  Committee and each of the members of the Equity  Committee  (the "Equity
Holders").  The Restructuring Plan Support Agreement supersedes the Plan Support
Agreement.  Under the  Restructuring  Plan Support Agreement the parties thereto
agreed to support the Fourth Modified Plan of Reorganization  the terms of which
are  substantially  similar  to those  set  forth in the Term  Sheet  previously
disclosed in Amendment No. 5 to the Schedule 13D. Under the  Restructuring  Plan
Support  Agreement  the  Consenting  Noteholders  agreed to vote their claims in
support of the Fourth Modified Plan of Reorganization, subject to the conditions
to termination contained in the Restructuring Plan Support Agreement.

     As previously  disclosed in Amendment No. 5 to the Schedule 13D and as more
fully described in the Fourth Modified Plan of Reorganization,  under the Fourth
Modified Plan of  Reorganization  the Noteholders will receive,  in exchange for
their Notes,  their pro-rata share of (i) between  $90,000,000 and  $110,000,000
principal amount of New Senior Secured Notes,  (ii) the Cash Payment,  (iii) all
cash proceeds from the Rights Offering,  (iv) payment in cash of all accrued but
unpaid  interest due under the Notes  through the date of  effectiveness  of the
Issuer Parties' bankruptcy cases and (v) the Supplemental Equity Exchange.

     As previously  disclosed in Amendment No. 5 to the Schedule 13D and as more
fully described in the Fourth Modified Plan of  Reorganization  and the Backstop
Commitment  Agreement  entered  into on May 14, 2010 by and among the Issuer and
the Consenting Noteholders (the "Backstop Commitment Agreement"), the Consenting
Noteholders agreed to backstop the Rights Offering (the "Backstop  Commitment"),
subject to the  conditions to closing and  termination  contained  therein.  The
Backstop  Commitment  Agreement sets forth, among other things, the terms of the
Backstop  Commitment  which  are  substantially   similar  to  those  previously
disclosed in Amendment No. 5 to the Schedule 13D.






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

     This description of the Fourth Modified Plan of Reorganization is a summary
only and is qualified in its entirety by reference to the Fourth  Modified  Plan
of  Reorganization,  a copy of which was filed as  Exhibit A of Exhibit 10.1 of
the Current Report on Form 8-K filed by the Issuer on May 18, 2010.

     This description of the  Restructuring  Plan Support Agreement and Backstop
Commitment  Agreement  is a summary  only and is  qualified  in its  entirety by
reference to the Restructuring  Plan Support  Agreement and Backstop  Commitment
Agreement,  copies  of  which  are  referenced  as  Exhibits  14 and 15  hereto,
respectively,   (which   incorporate  by  reference   Exhibits  10.1  and  10.2,
respectively,  of the Current  Report on Form 8-K filed by the Issuer on May 18,
2010).



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 May 14, 2010, the Consenting  Noteholders
entered into the  Restructuring  Plan Support Agreement with the Issuer Parties,
the Equity  Committee and the Equity  Holders,  under which the parties  thereto
agreed  to the terms of a  restructuring  of the Notes  pursuant  to the  Fourth
Modified  Plan of  Reorganization,  a copy of which is  referenced as Exhibit 14
hereto (which  incorporates  by reference  Exhibit 10.1 of the Current Report on
Form 8-K filed by the  Issuer on May 18,  2010)  and is  incorporated  herein by
reference.

     As described in Item 4 above,  on May 14, 2010, the Consenting  Noteholders
entered into the Backstop Commitment  Agreement with the Issuer, under which the
Consenting  Noteholders agreed to backstop the Rights Offering,  a copy of which
is referenced as Exhibit 15 hereto (which incorporates by reference Exhibit 10.2
of the  Current  Report on Form 8-K filed by the Issuer on May 18,  2010) and is
incorporated herein by reference.

ITEM 7.       MATERIAL TO BE FILED AS EXHIBITS

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

     14. Restructuring Plan Support Agreement,  dated as of May 14, 2010, by and
among the Consenting  Noteholders,  the Issuer Parties, the Equity Committee and
the Equity  Holders  (incorporated by  reference  to Exhibit 10.1 of the Current
Report on Form 8-K filed by the Issuer on May 18, 2010).

     15. Backstop Commitment  Agreement,  dated as of May 14, 2010, by and among
the Consenting Noteholders and  the Issuer (incorporated by reference to Exhibit
10.2 of the Current Report on Form 8-K filed by the Issuer on May 18, 2010).





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

     Dated: May 18, 2010

            GOLDMAN SACHS ASSET MANAGEMENT, L.P.

            By: /s/ Yvette Kosic
                ---------------------
                Name:  Yvette Kosic
                Title:  Attorney-in-fact


            GS INVESTMENT STRATEGIES, LLC

            By: /s/ Yvette Kosic
                ---------------------
                Name:  Yvette Kosic
                Title:  Attorney-in-fact

            LIBERTY HARBOR I GP, LLC

            By: /s/ Yvette Kosic
                ---------------------
                Name:  Yvette Kosic
                Title:  Attorney-in-fact


            LIBERTY HARBOR MASTER FUND I, L.P.
            By:  LIBERTY HARBOR I GP, LLC, its general partner

            By: /s/ Yvette Kosic
                ---------------------
                Name:  Yvette Kosic
                Title:  Attorney-in-fact