Acceleron Prices 3.75M Share Offering @$40.00/Share

Acceleron Pharma Inc.

today announced that it has priced an underwritten public offering of 3,750,000 shares of common stock at a price to the public of $40.00 per share for gross proceeds of $150 million. In connection with this offering, Acceleron has granted the underwriters a 30-day option to purchase up to an additional 562,500 shares of common stock. Morgan Stanley, Leerink Partners LLC and UBS Investment Bank are acting as joint book-running managers for the offering. JMP Securities is acting as the lead manager and FBR is acting as co-manager for the