Inquiries related to the Company may be directed to the Investor Relations department at our headquarters. Communications related to stock and transfer requirements, including lost stock certificates and change of name or address, should be directed to the Transfer Agent.

Investor Relations ImmunoGen, Inc. Phone: (781) 895-0600 Fax: (781) 895-0611 Email: info@immunogen.com Transfer Agent and Registrar Mellon Investor Services, LLC Ridgefield Park, NJ Phone: (800) 288-9541 www.melloninvestor.com/isd

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