ImmunoGen, Inc. Announces Proposed Public Offering of Common Stock

WALTHAM, Mass.--(BUSINESS WIRE)-- ImmunoGen, Inc. (Nasdaq: IMGN), a biopharmaceutical company that develops targeted anticancer therapeutics, announced today that it intends to offer, subject to market and other conditions, 8,500,000 shares of its common stock in an underwritten public offering. ImmunoGen expects to grant the underwriters a thirty (30) day option to purchase up to 1,275,000 additional shares to cover over-allotments, if any.

J.P. Morgan Securities Inc. is acting as the sole book-runner for the offering.

The securities described above are being offered by ImmunoGen pursuant to a registration statement previously filed and declared effective by the Securities and Exchange Commission. This press release does not constitute an offer to sell or a solicitation of an offer to buy the securities in this offering. The offering may be made only by means of a prospectus, copies of which may be obtained, when available, from J.P. Morgan Securities Inc., Attention: Broadridge Financial Solutions, 1155 Long Island Avenue, Edgewood, New York 11717, or by telephone at 1-866-803-9204.

About ImmunoGen, Inc.

ImmunoGen, Inc. develops targeted anticancer therapeutics using its expertise in cancer biology, monoclonal antibodies and the creation and attachment of potent cell-killing agents. The Company’s Targeted Antibody Payload (TAP) technology uses antibodies to deliver one of ImmunoGen’s potent cell-killing agents specifically to tumor targets. In addition to the Company’s product pipeline, compounds utilizing the TAP technology are in clinical testing through ImmunoGen’s collaborations with Genentech (a wholly owned member of the Roche Group), sanofi-aventis, Biogen Idec and Biotest. The most advanced compound, T-DM1, is in Phase III testing being conducted by Genentech/Roche. Other ImmunoGen collaborative partners include Bayer HealthCare and Amgen.

This press release includes forward-looking statements. For these statements, ImmunoGen claims the protection of the safe harbor for forward-looking statements provided by the Private Securities Litigation Reform Act of 1995. It should be noted that there are risks and uncertainties related to the public offering. A review of these risks can be found in ImmunoGen’s Annual Report on Form 10-K for the fiscal year ended June 30, 2009 and other reports filed with the Securities and Exchange Commission.



CONTACT:

ImmunoGen, Inc.
Carol Hausner, 781-895-0600
Executive Director, Investor Relations
and Corporate Communications
[email protected]

KEYWORDS:   United States  North America  Massachusetts

INDUSTRY KEYWORDS:   Health  Biotechnology  Pharmaceutical  General Health

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