Ironwood Pharmaceuticals Announces Exercise of Over-Allotment Option in Public Offering of Common Stock

Ironwood Pharmaceuticals, Inc. (NASDAQ: IRWD) today announced that the underwriters of its previously announced public offering of Class A common stock have exercised their option to purchase an additional 787,500 shares at a public offering price of $15.09 per share. As a result, the Company will issue a total of 6,037,500 shares in the offering and will receive aggregate net proceeds, after underwriting discounts and commissions and other estimated offering expenses, of approximately $85.3 million. The offering is expected to close on February 15, 2012, subject to the satisfaction of customary closing conditions.