CAMBRIDGE, Mass.--(BUSINESS WIRE)--Ra Pharmaceuticals, Inc., a clinical stage biopharmaceutical company focusing on using its proprietary peptide chemistry platform to develop novel therapeutics for the treatment of serious diseases that are caused by excessive or uncontrolled activation of the complement system, a critical component of the immune system, today announced the pricing of its initial public offering of 7,049,230 shares of common stock at a public offering price of $13.00 per share. In addition, Ra has granted the underwriters a 30-day option to purchase up to 1,057,385 additional shares of common stock at the initial public offering price, less the underwriting discount. Ra’s common stock is expected to begin trading on the NASDAQ Global Market under the ticker symbol "RARX" on October 26, 2016.

Credit Suisse Securities (USA) LLC, Jefferies LLC, and BMO Capital Markets Corp. are acting as joint book-running managers for the offering. SunTrust Robinson Humphrey is acting as lead manager.