Ironwood Pharmaceuticals Announces 10.5M Share Proposed Public Offering of Common Stock

Ironwood Pharmaceuticals

today announced that it has commenced an underwritten public offering of 10,500,000 shares of its Class A common stock. All of the shares are being offered by Ironwood. The Company will grant the underwriters a 30-day option to purchase up to an additional 1,575,000 shares in connection with the offering. The Company intends to use the net proceeds from this offering to support the commercial launch of LINZESS® (linaclotide) in the U.S. and to fund linaclotide development opportunities to strengthen the clinical profile of LINZESS and expand the product label for additional populations and indications, in addition to general corporate purposes. J.P. Morgan and BofA Merrill Lynch are acting as joint bookrunning managers and as representatives of the underwriters for the offering. Morgan Stanley is acting as bookrunning manager for the offering. A preliminary prospectus supplement related to the offering will be filed with the Securities and Exchange Commission (SEC) and will be available on the SEC's website located at www.sec.gov. Copies of the preliminary prospectus supplement and the accompanying prospectus relating to this offering may be obtained from the offices of: J.P. Morgan, c/o Broadridge Financial Solutions, 1155 Long Island Avenue, Edgewood, New York 11717 (telephone number: 866-803-9204) or from BofA Merrill Lynch, 222 Broadway, New York, New York 10038, Attention: Prospectus Department or by emailing dg.prospectus_requests@baml.com. The offering is subject to market and other conditions, and there can be no assurance as to whether or when the offering may be completed, or as to the actual size or terms of the offering. The final terms of the offering will be disclosed in a final prospectus supplement filed with the SEC. The securities described above are being offered by Ironwood pursuant to an automatically effective shelf registration statement that was previously filed with the SEC. The press release shall not constitute an offer to sell, or the solicitation of an offer to buy, any of the securities, nor shall there be any sale of these securities, in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction. About Ironwood Pharmaceuticals Ironwood Pharmaceuticals

is committed to the art and science of making medicines, from discovery through commercialization. We're focused on three goals: transforming knowledge into medicines that make a difference for patients, creating value that will inspire the continued support of our fellow shareholders, and building a team that passionately pursues excellence. Our first product, linaclotide, is approved in the United States and Europe. Our pipeline priorities include exploring further opportunities for linaclotide, leveraging our deep expertise in functional gastrointestinal disorders, and advancing programs in other areas such as allergic conditions, cardiovascular disease, central nervous system disorders and other conditions defined by patient symptoms. Ironwood was founded in 1998 and is headquartered in Cambridge, Mass.