X0306 4 2013-03-01 0 0001446847 IRONWOOD PHARMACEUTICALS INC IRWD 0001024003 COOK JOSEPH C JR C/O IRONWOOD PHARMACEUTICALS, INC. 301 BINNEY STREET CAMBRIDGE MA 02142 1 0 0 0 Class A Common Stock 2013-03-01 5 J 0 E 2304 0.00 A 43239 D Class B Common Stock 397073 D Class B Common Stock 43025 I By Farview Management Company, L.P. Distributed pro rata to the limited partners of Farview Management Company, L.P. without additional consideration in accordance with the partnership agreement of Farview Management Company, L.P. In order to effect the distribution, shares of Class B Common Stock were converted into shares of Class A Common Stock in accordance with the issuer's certificate of incorporation. In prior reports, the reporting person reported indirect beneficial ownership of 86,025 shares of Class B Common Stock held by Farview Management Company, L.P. On March 1, 2013, Farview Management Company, L.P. distributed 43,000 shares to its limited partners without additional consideration in accordance with its partnership agreement. In order to effect the distribution, such shares of Class B Common Stock were converted into shares of Class A Common Stock in accordance with the issuer's certificate of incorporation. The reporting person is a general partner of Farview Management Company, L.P., the beneficial owner of the securities. /s/ Halley E. Gilbert Attorney-in-Fact 2013-03-05