X0306 4 2015-02-19 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 2015-02-19 4 S 0 32900 15.60 D 49175 D Class A Common Stock 2015-02-20 4 S 0 2600 15.63 D 46575 D Class B Common Stock 306163 D Class B Common Stock 24000 I By Farview Management Company, L.P. This sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person. The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $15.44 to $15.78, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote. The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $15.55 to $15.71, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote. 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 2015-02-23