AMARIN CORP PLC\UK — Director's Dealing 2011

Apr 6, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

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

Reporting Person: Ahlholm Frederick W (Vice President Finance)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-04-04	Ordinary Shares	M	31250	$1.70	Acquired	31250	Direct
2011-04-04	Ordinary Shares	S	31250	$7.478	Disposed	0	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-04-04	Stock Option (right to buy)	$1.70	M	31250	Disposed	2020-04-20	Ordinary Shares (31250)	Direct

Footnotes

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

F2: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $7.390 to $7.530, 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.

F3: On April 20, 2010, the reporting person was granted an option to purchase 250,000 ordinary shares under the Amarin Corporation plc 2002 Stock Option Plan. The stock option initially vested in four equal installments on each anniversary of such grant date. On April 4, 2011, the reporting person exercised and sold 31,250 ordinary shares underlying such option. In December 2010, the Issuer's Board of Directors approved the acceleration of the vesting of this award by six months such that the option vests in four equal installments beginning on October 20, 2010 and ending on October 20, 2013.