Acceleron Prices 5.58M Share IPO at $15.00/Share

Acceleron Pharma, Inc. today announced the pricing of its initial public offering of 5,580,000 shares of common stock at a public offering price of $15.00 per share, before underwriting discounts. In addition, Acceleron has granted the underwriters a 30-day option to purchase up to an additional 837,000 shares of common stock at the public offering price, less underwriting discounts. Separately, in a concurrent, side-by-side private placement, Acceleron's collaboration partner, Celgene Corporation

, has agreed to purchase 666,667 shares of common stock from Acceleron at the public offering price. Acceleron's common stock has been approved for listing on the NASDAQ Global Market and is expected to begin trading under the ticker symbol “XLRN” on September 19, 2013.