ImmunoGen Inc. (Nasdaq: IMGN) announced that it intends to offer and sell, subject to market and other conditions, $175 million of shares of its common stock in an underwritten public offering. ImmunoGen also intends to grant the underwriters a 30-day option to purchase up to an additional fifteen percent (15%) of the number of shares of common stock offered in the public offering at the public offering price, less underwriting discounts and commissions. All of the shares of common stock to be sold in the offering are to be offered by ImmunoGen. There can be no assurance as to whether or when the offering may be completed, or as to the actual size or terms of the offering.

ImmunoGen intends to use the net proceeds of the offering to fund its operations, including, but not limited to, commercialization activities, clinical trial activities, supply of drug product, business development activities, capital expenditures, and working capital.

Jefferies, Cowen, and Guggenheim Securities are acting as joint book-running managers for the proposed offering. Canaccord Genuity is acting as lead manager for the proposed offering.