Spero Therapeutics, Inc. Shares of Common Stock (par value $0.001 per share) Controlled Equity OfferingSM Sales AgreementSpero Therapeutics, Inc. • December 3rd, 2018 • Pharmaceutical preparations • New York
Company FiledDecember 3rd, 2018 Industry JurisdictionSpero Therapeutics, Inc., a Delaware corporation (the “Company”), confirms its agreement (this “Agreement”) with Cantor Fitzgerald & Co. (the “Agent”), as follows: