Form of Common Share Certificate



 Exhibit 4.2 

 
 



 
 5072080 
 GSI Group Inc. 
 Number 

00100014ZQ 
 Shares 11111 
 INCORPORATED UNDER THE BUSINESS
CORPORATIONS ACT (NEW BRUNSWICK) 
 THIS CERTIFIES THAT 

SPECIMEN CERTS 
 CUSIP 36191C205 
 ISIN CA36191C2058 

IS THE REGISTERED HOLDER OF 
 * * * 1 * * * 
 SEE REVERSE FOR CERTAIN DEFINITIONS

 FULLY PAID AND NON-ASSESSABLE COMMON SHARES WITHOUT PAR VALUE IN THE CAPITAL OF 

GSI Group Inc. 
 transferable on the books of the Corporation only upon surrender of this certificate properly endorsed. 
 This certificate is not valid unless countersigned by the Transfer Agent and Registrar of the Corporation. 
 IN WITNESS WHEREOF the Corporation has caused this certificate to be signed on its behalf by the facsimile signatures of its duly authorized officers. 

Principal Financial Officer 
 Vice President 
 COUNTERSIGNED AND REGISTERED

 COMPUTERSHARE TRUST COMPANY, N.A. 
 (GOLDEN) 
 TRANSFER AGENT AND REGISTRAR OR

 Vice President 
 By Authorized Officer 
 Dated: Mar 14, 2012

 COUNTERSIGNED AND REGISTERED 
 COMPUTERSHARE INVESTOR SERVICES INC. 
 (TORONTO)

 TRANSFER AGENT AND REGISTRAR 
 By Authorized Officer 
 The shares represented by
this certificate are transferable at the offices of Computershare Investor Services Inc. in Toronto, ON and Computershare Trust Company, N.A. in Golden, CO 
 SECURITY INSTRUCTIONS ON REVERSE 
 VOIR LES
INSTRUCTIONS DE SECURITE AU VERSO 
 CSAE_00164874_LSIQ.TOR.PULLS/000001/000001/i 

C8888889133 | T 
 Printed by DATA BUSINESS FORMS 







  
 



 
 The following abbreviations shall be construed as though the words set forth below
opposite each abbreviation were written out in full where such abbreviation appears: 
 TEN COM-as tenants in
common 
 TEN ENT - as tenants by the entireties 

JT TEN -as joint tenants with rights of survivorship and not as tenants in common 

(Name) CUST (Name) UNIF - (Name) as Custodian for (Name) under the 

GIFT MIN ACT (State) (State) Uniform Gifts to Minors Act 

Additional abbreviations may also be used though not in the above list. 

For value received the undersigned hereby sells, assigns and transfers unto 

Insert name and address of transferee 
 shares 
 represented by this certificate and does
hereby irrevocably constitute and appoint 
 the attorney 

of the undersigned to transfer the said shares on the books of the Corporation with full power of substitution in the
premises. 
 DATED: 
 Signature of Shareholder 
 Signature of Guarantor

 Signature Guarantee: 
 The signature on this assignment must correspond with the name as written upon the face of the certificate(s), in every particular, without alteration or enlargement, or any change
whatsoever and must be guaranteed by a major Canadian Schedule I chartered bank or a member of an acceptable Medallion Signature Guarantee Program (STAMP, SEMP, MSP). The Guarantor must affix a stamp bearing the actual words “Signature
Guaranteed”, 
 In the USA, signature guarantees must be done by members of a “Medallion Signature
Guarantee Program” only. 
 Signature guarantees are not accepted from Treasury Branches, Credit Unions or
Caisses Populaires unless they are members of the Stamp Medallion Program. 
 SECURITY INSTRUCTIONS-INSTRUCTIONS
DE SÉCURITÉ 
 THIS IS WATERMARKED PAPER, DO NOT ACCEPT WITHOUT NOTING 

WATERMARK. HOLD TO LIGHT TO VERIFY WATERMARK. 
 PAPIER FILIGRANÉ, NE PAS ACCEPTER SANS VÉRIFIER LA PRÉSENCE 
 DU FILIGRANE. POUR CE FAIRE, PLACER À LA LUMIÉRE. 
 EN_CORP_V2_01