Acceleron Pharma Inc. 5,405,406 Shares(1) Common Stock ($0.001 par value) Underwriting AgreementUnderwriting Agreement • September 25th, 2017 • Acceleron Pharma Inc • Biological products, (no disgnostic substances) • New York
Acceleron Pharma Inc., a corporation organized under the laws of Delaware (the “Company”), proposes to sell to the several underwriters named in Schedule I hereto (the “Underwriters”), for whom you (the “Representatives”) are acting as representatives, 5,405,406 shares of common stock, $0.001 par value (“Common Stock”), of the Company (said shares to be issued and sold by the Company being hereinafter called the “Underwritten Securities”). The Company also proposes to grant to the Underwriters an option to purchase up to 810,810 additional shares of Common Stock (the “Option Securities”; the Option Securities, together with the Underwritten Securities, being hereinafter called the “Securities”). To the extent there are no additional Underwriters listed on Schedule I other than you, the term Representatives as used herein shall mean you, as Underwriters, and the terms Representatives and Underwriters shall mean either the singular or plural as the context requires. Certain terms used he
