<SEC-DOCUMENT>0001564590-15-002540-index.html : 20150413
<SEC-HEADER>0001564590-15-002540.hdr.sgml : 20150413
<ACCEPTANCE-DATETIME>20150413155956
ACCESSION NUMBER:		0001564590-15-002540
CONFORMED SUBMISSION TYPE:	DEF 14A
PUBLIC DOCUMENT COUNT:		11
CONFORMED PERIOD OF REPORT:	20150512
FILED AS OF DATE:		20150413
DATE AS OF CHANGE:		20150413
EFFECTIVENESS DATE:		20150413

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:		DEF 14A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-35083
		FILM NUMBER:		15766762

	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>
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<TYPE>DEF 14A
<SEQUENCE>1
<FILENAME>gsig-def14a20150415.htm
<DESCRIPTION>DEF 14A
<TEXT>
Document 1 - file: gsig-def14a20150415.htm

</DOCUMENT>
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<SEQUENCE>2
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<DESCRIPTION>GRAPHIC
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Document 2 - file: g201504131721024773600.jpg

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<FILENAME>g201504131721025083601.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 3 - file: g201504131721025083601.jpg

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<FILENAME>g201504131721026963602.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 4 - file: g201504131721026963602.jpg

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<TEXT>
Document 5 - file: g201504131721027903603.jpg

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<DESCRIPTION>GRAPHIC
<TEXT>
Document 6 - file: g201504131721098523604.jpg

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Document 7 - file: g201504131721098523605.jpg

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Document 8 - file: g201504131721206493606.jpg

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<TEXT>
Document 9 - file: g201504131721214933607.jpg

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<SEQUENCE>10
<FILENAME>g201504131721220403608.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 10 - file: g201504131721220403608.jpg

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<TEXT>
Document 11 - file: g201504131721229463609.jpg

</DOCUMENT>
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