ImmunoGen, Inc. 26,000,000 Shares of Common Stock, par value $.01 per share Underwriting AgreementUnderwriting Agreement • May 5th, 2023 • ImmunoGen, Inc. • Pharmaceutical preparations • New York
ImmunoGen, Inc., a Massachusetts corporation (the “Company”), proposes to issue and sell to the several Underwriters listed in Schedule 1 hereto (the “Underwriters”), for whom you are acting as representatives (the “Representatives”), an aggregate of 26,000,000 shares (the “Firm Shares”) of common stock, par value $.01 per share, of the Company (the “Common Stock”) and, at the option of the Underwriters, up to an additional 3,900,000 shares of Common Stock (the “Option Shares”). The Firm Shares and the Option Shares are herein referred to as the “Shares”. The shares of Common Stock to be outstanding after giving effect to the sale of the Shares are referred to herein as the “Stock”.
