Spero Therapeutics Announces Closing of Initial Public Offering

Spero Therapeutics, Inc., a multi-asset, clinical-stage biopharmaceutical company focused on identifying, developing and commercializing novel treatments for multi-drug resistant bacterial infections, today announced the closing of its initial public offering of 5,500,000 shares of its common stock at a public offering price of $14.00 per share, before underwriting discounts and commissions.  In addition, Spero Therapeutics, Inc. has granted the underwriters a 30-day option to purchase up to 825,000 additional shares of its common stock at the initial public offering price. The shares began trading on The Nasdaq Global Select Market on November 2, 2017 under the ticker symbol “SPRO.”