AMARIN CORP PLC\UK — Director's Dealing 2011

Apr 26, 2011

SEC Form 4/A — Form 4/A

Issuer: AMARIN CORP PLC\UK (AMRN)
CIK: 0000897448
Period of Report: 2011-04-20

Reporting Person: GORDON CARL L (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-04-20	Ordinary Shares	S	792400	$15.79	Disposed	2674300	Indirect
2011-04-20	Ordinary Shares	S	7600	$15.79	Disposed	25700	Indirect

Footnotes

F1: The Ordinary Shares (the "Shares") may be represented by American Depositary Shares, each of which currently represents one Ordinary Share.

F2: The reporting person is affiliated with OrbiMed Private Investments III, LP ("OPI III") and OrbiMed Associates III, LP ("Associates"), which hold the Shares reported herein. OrbiMed Capital GP III LLC ("Capital") is the sole general partner of OPI III. OrbiMed Advisors LLC ("Advisors"), a registered adviser under the Investment Advisers Act of 1940, as amended, is the sole managing member of Capital and the sole general partner of Associates. Samuel D. Isaly ("Isaly"), a natural person, is the managing member of, and holder of a controlling interest in, Advisors. OPI III and Associates have designated a representative, currently the reporting person, a member of Advisors, to serve on the Issuer's board of directors.

F3: The reporting person does not have sole voting or investment power over the securities held by OPI III and Associates. However, the reporting person may be deemed to have beneficial ownership of these securities by virtue of his affiliation with Advisors. The reporting person disclaims beneficial ownership of the Shares reported herein for purposes of Rule 16a-1(a) under the Securities Exchange Act of 1934, as amended (the "Exchange Act"), except to the extent of his pecuniary interest therein, if any. This report on Form 4 shall not be deemed an admission that the reporting person is a beneficial owner for the purpose of Section 16 of the Exchange Act, or for any other purpose.

F4: These Shares are beneficially owned by OPI III.

F5: These Shares are beneficially owned by Associates.

F6: The price reported in Column 4 is a weighted average price. These Shares were sold in multiple transactions at prices ranging from $15.40 to $16.05, 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 range set forth in this footnote.