GSI Lumonics Announces Name Change to GSI Group

BILLERICA, MA, June, 2005 — GSI Lumonics Inc. (Nasdaq: GSIG and TSX: GSI) has announced a company name change from GSI Lumonics Inc. to GSI Group Inc. The company also announced a new trading symbol on the NASDAQ stock exchange: GSIG. GSI Group will be led by the same management team.

The company’s new name reflects an organization composed of diverse yet related high technology businesses, each of which supplies unique value to its customer base. In conjunction with the company name change, GSI Group will place more emphasis on the individual product brands that its various customer groups rely upon: General Scanning™, MicroE Systems®, Westwind®, and General Optics™ precision motion products; JK™, Spectron®, Lumonics®, and eCO2™ lasers; and WaferMark®, WaferRepair™, WaferTrim™, CircuitTrim™, and SVS™ laser systems.

GSI Group Inc. develops and delivers the enabling technology solutions that bring advanced manufacturing applications to life. Our leading brands include precision motion products, lasers, and laser systems, and are used to increase efficiency and productivity in the global medical, semiconductor, electronics, and industrial markets. GSI Group is a global company with manufacturing, sales and support facilities throughout Europe, Asia, and North America. The company’s common shares are listed on Nasdaq (GSIG) and The Toronto Stock Exchange (GSI). For more information on GSI Group, please visit www.gsig.com.