AMARIN CORP PLC\UK — Director's Dealing 2015

Feb 2, 2015

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AMARIN CORP PLC\UK (AMRN)
CIK: 0000897448
Period of Report: 2015-01-31

Reporting Person: THERO JOHN F (President, Chief Exec. Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2015-01-31	Ordinary Shares	M	169500	—	Acquired	284400	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2015-01-31	Restricted Stock Units	$0	M	169500	Disposed		Ordinary Shares (169500)	Direct
2015-02-02	Stock Option (right to buy)	$1.02	A	400000	Acquired	2025-02-01	Ordinary Shares (400000)	Direct
2015-02-02	Restricted Stock Units	$0	A	780000	Acquired		Ordinary Shares (780000)	Direct

Footnotes

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

F2: On January 8, 2014, the Reporting Person was granted 508,500 restricted stock units ("RSUs") under the Amarin Corporation plc 2011 Stock Incentive Plan. These RSUs vest in three equal annual installments on each of January 31, 2015, January 31, 2016 and January 31, 2017. The first vesting event occurred on January 31, 2015. Upon vesting of the RSUs, the Reporting Person had the option to have the Issuer withhold shares from the total number of shares delivered in respect of withholding taxes due upon such vesting. Instead, the Reporting Person elected to pay withholding taxes to the Issuer in cash and receive the full number of shares vested.

F3: Not applicable.

F4: Each RSU represents a contingent right to receive one Ordinary Share or cash in lieu thereof at the Issuer's discretion.

F5: On February 2, 2015, the Reporting Person was granted an option to purchase 400,000 Ordinary Shares under the Amarin Corporation plc 2011 Stock Incentive Plan. The shares subject to this option shall vest and become exercisable in 48 equal monthly installments on the last day of each month starting on February 28, 2015.

F6: On February 2, 2015, the Reporting Person was granted 780,000 RSUs under the Amarin Corporation plc 2011 Stock Incentive Plan. These RSUs vest in three equal annual installments on each of January 31, 2016, January 31, 2017 and January 31, 2018.