3


8987391  03218123

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

                             ______________________


                                    FORM 8-K

                                 CURRENT REPORT

                     PURSUANT TO SECTION 13 OR 15(D) OF THE
                         SECURITIES EXCHANGE ACT OF 1934

                             ______________________


        Date of Report (Date of earliest event reported):  APRIL 6, 2005


                               THE GSI GROUP, INC.
             (Exact Name of Registrant as Specified in Its Charter)

                                    DELAWARE
                 (State or Other Jurisdiction of Incorporation)


                                      37-0856587
                         333-43089     (I.R.S. Employer
                (Commission File Number)     Identification No.)


             1004 E. ILLINOIS STREET, ASSUMPTION, ILLINOIS          62510
     (Address  of  Principal Executive Offices)                       (Zip Code)

      Registrant's Telephone Number, Including Area Code:    (217) 226-4421


Check  the  appropriate  box  below  if  the  Form  8-K  filing  is  intended to
simultaneously  satisfy the filing obligation of the registrant under any of the
following  provisions:

[  ]  Written  communications  pursuant to Rule 425 under the Securities Act (17
CFR  230.425)

[  ]  Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR
240.14a-12)

[  ]  Pre-commencement  communications  pursuant  to  Rule  14d-2(b)  under  the
Exchange  Act  (17  CFR  240.14d-2(b))

[  ]  Pre-commencement  communications  pursuant  to  Rule  13e-4(c)  under  the
Exchange  Act  (17  CFR  240.13e-4(c))


ITEM  5.01.   CHANGES  IN  CONTROL  OF  REGISTRANT

(B)

The stockholders of The GSI Group, Inc., a Delaware corporation (the "Company"),
have  entered  into  a  Stock Purchase Agreement, dated as of April 6, 2005 (the
"Purchase  Agreement"),  with  GSI  Holdings  Corp.,  a  Delaware  corporation
("Purchaser"),  pursuant  to which the stockholders of the Company (the "Selling
Stockholders")  have  agreed to sell all of the issued and outstanding shares of
voting  and  non-voting common stock of the Company (the "Shares") to Purchaser.
Purchaser  is  an affiliate of Charlesbank Equity Fund V, Limited Partnership, a
Massachusetts  limited  partnership  ("Charlesbank").

In  connection with the consummation of the transaction, it is expected that the
Company  will  refinance or amend its senior credit facility and its 10 % senior
subordinated  notes  due  2007.

The  consummation of the transaction, which is expected to occur in May 2005, is
subject to customary conditions, including the receipt of any required antitrust
approvals  or  clearances.  The  transaction  is also subject to the Company and
Purchaser  receiving  financing.

On  April  12,  2005, the Company issued a press release concerning the proposed
transaction,  a  copy  of  which  is  attached  as  Exhibit  99.1.

ITEM  9.01  FINANCIAL  STATEMENTS  AND  EXHIBITS

(a)     Financial  Statements  of  Business  Acquired

Not  Applicable.

(b)     Pro  Forma  Financial  Information

Not  Applicable.

(c)     Exhibits


Item  No.     Description.
---------     -----------

99.1     Company  press  release  dated  April  12,  2005.



                                   SIGNATURES


     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  hereunto  duly  authorized.


THE  GSI  GROUP,  INC.


                                    By:  /s/  Russell  C.  Mello_____
                                         ----------------------------
                                           Name:  Russell  C.  Mello
Date:  April  12,  2005                    Title:  Chief  Executive  Officer