SIENNA BIOPHARMACEUTICALS, INC. 8,000,000 Shares of Common Stock Underwriting AgreementUnderwriting Agreement • February 22nd, 2019 • Sienna Biopharmaceuticals, Inc. • Pharmaceutical preparations • New York
Sienna Biopharmaceuticals, Inc., a Delaware 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 8,000,000 shares of common stock, par value $0.0001 per share, of the Company (the “Underwritten Shares”) and, at the option of the Underwriters, up to an additional 1,200,000 shares of common stock of the Company (the “Option Shares”). The Underwritten Shares and the Option Shares are herein referred to as the “Shares”. The shares of common stock of the Company to be outstanding after giving effect to the sale of the Shares are referred to herein as the “Stock”.
