X0305 4 2012-04-03 0 0000897448 AMARIN CORP PLC\UK AMRN 0001397144 Abingworth LLP PRINCE HOUSE 38 JERMYN STREET LONDON X0 SW1Y 6DN UNITED KINGDOM 0 0 1 0 Ordinary Shares, 50 pence par value per share 2012-04-03 4 S 0 2300000 11.00 D 5607509 I See Notes Abingworth LLP (the "Reporting Person") is the investment manager to a number of investment funds that include Abingworth Bioventures V L.P. ("ABV V"), Abingworth Bioventures V Co-Invest Growth Equity Fund LP ("AGE"), and Abingworth Bioequities Master Fund Limited ("ABE," and collectively with ABV V and AGE, the "Abingworth Funds"). On April 3, 2012, ABV sold an aggregate of 1,000,000 ordinary shares, 50 pence par value per share, of Amarin Corporation plc ("Ordinary Shares"), AGE sold an aggregate of 1,000,000 Ordinary Shares, and ABE sold an aggregate of 300,000 Ordinary Shares. The Reporting Person may be deemed to beneficially own the Ordinary Shares reported herein indirectly through the Abingworth Funds. The Reporting Person's interest in the securities reported herein is limited to the extent of its pecuniary interest, if any, in the Abingworth Funds. This report shall not be deemed an admission that the Reporting Person, each Abingworth Fund or any other person is the beneficial owner of the securities reported herein for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose. /s/ John Heard, Authorized Signatory 2012-04-05