<SEC-DOCUMENT>0001564590-16-015256-index.html : 20160325
<SEC-HEADER>0001564590-16-015256.hdr.sgml : 20160325
<ACCEPTANCE-DATETIME>20160324192101
ACCESSION NUMBER:		0001564590-16-015256
CONFORMED SUBMISSION TYPE:	PRE 14A
PUBLIC DOCUMENT COUNT:		8
CONFORMED PERIOD OF REPORT:	20160510
FILED AS OF DATE:		20160325
DATE AS OF CHANGE:		20160324

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			GSI GROUP INC
		CENTRAL INDEX KEY:			0001076930
		STANDARD INDUSTRIAL CLASSIFICATION:	MISCELLANEOUS ELECTRICAL MACHINERY, EQUIPMENT & SUPPLIES [3690]
		IRS NUMBER:				980110412
		STATE OF INCORPORATION:			A3
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		PRE 14A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-35083
		FILM NUMBER:		161528468

	BUSINESS ADDRESS:	
		STREET 1:		125 MIDDLESEX TURNPIKE
		STREET 2:		.
		CITY:			BEDFORD
		STATE:			MA
		ZIP:			01730
		BUSINESS PHONE:		781-266-5618

	MAIL ADDRESS:	
		STREET 1:		125 MIDDLESEX TURNPIKE
		STREET 2:		.
		CITY:			BEDFORD
		STATE:			MA
		ZIP:			01730

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	GSI LUMONICS INC
		DATE OF NAME CHANGE:	19990401

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	GSI LUMONICS
		DATE OF NAME CHANGE:	19990331

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	LUMONICS INC
		DATE OF NAME CHANGE:	19990115
</SEC-HEADER>
<DOCUMENT>
<TYPE>PRE 14A
<SEQUENCE>1
<FILENAME>gsig-pre14a_20151231.htm
<DESCRIPTION>PRE 14A
<TEXT>
Document 1 - file: gsig-pre14a_20151231.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>2
<FILENAME>gzueaxke40fn000001.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 2 - file: gzueaxke40fn000001.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>gzueaxke40fn000002.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 3 - file: gzueaxke40fn000002.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>gzueaxke40fn000003.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 4 - file: gzueaxke40fn000003.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>5
<FILENAME>gzueaxke40fn000004.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 5 - file: gzueaxke40fn000004.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>6
<FILENAME>gzueaxke40fn000005.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 6 - file: gzueaxke40fn000005.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>7
<FILENAME>gzueaxke40fn000006.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 7 - file: gzueaxke40fn000006.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>8
<FILENAME>gzueaxke40fn000007.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 8 - file: gzueaxke40fn000007.jpg

</DOCUMENT>
</SEC-DOCUMENT>