Momenta Pharmaceuticals, Inc. (NASDAQ: MNTA) today announced that it is commencing an underwritten registered public offering of $200,000,000 of shares of its common stock. Momenta also expects to grant the underwriters of the offering an option to purchase up to an additional $30,000,000 of shares of its common stock, exercisable for 30 days. All of the shares in the proposed offering are to be sold by Momenta.

Goldman Sachs & Co. LLC and J.P. Morgan are acting as joint lead book-running managers for the offering. Stifel is acting as a book-running manager for the offering.