AMARIN CORP PLC\UK — Director's Dealing 2018

Oct 2, 2018

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AMARIN CORP PLC\UK (AMRN)
CIK: 0000897448
Period of Report: 2018-09-28

Reporting Person: Ketchum Steven B (Chief Scientific Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2018-09-28	Ordinary Shares	M	200000	$8.77	Acquired	541297	Direct
2018-09-28	Ordinary Shares	S	100000	$15.00	Disposed	441297	Direct
2018-09-28	Ordinary Shares	S	100000	$16.00	Disposed	341297	Direct
2018-10-01	Ordinary Shares	M	100000	$8.77	Acquired	441297	Direct
2018-10-01	Ordinary Shares	M	2771	$2.95	Acquired	444068	Direct
2018-10-01	Ordinary Shares	M	3750	$2.50	Acquired	447818	Direct
2018-10-01	Ordinary Shares	M	3312	$2.50	Acquired	451130	Direct
2018-10-01	Ordinary Shares	M	4167	$2.50	Acquired	455297	Direct
2018-10-01	Ordinary Shares	M	2604	$1.40	Acquired	457901	Direct
2018-10-01	Ordinary Shares	S	116604	$17.20	Disposed	341297	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2018-09-28	Stock Option (Right to Buy)	$8.77	M	200000	Disposed	2022-03-01	Ordinary Shares (200000)	Direct
2018-10-01	Stock Option (Right to Buy)	$8.77	M	100000	Disposed	2022-03-01	Ordinary Shares (100000)	Direct
2018-10-01	Stock Option (Right to Buy)	$2.95	M	2771	Disposed	2027-01-31	Ordinary Shares (2771)	Direct
2018-10-01	Stock Option (Right to Buy)	$2.50	M	3750	Disposed	2025-07-06	Ordinary Shares (3750)	Direct
2018-10-01	Stock Option (Right to Buy)	$2.50	M	3312	Disposed	2025-07-06	Ordinary Shares (3312)	Direct
2018-10-01	Stock Option (Right to Buy)	$2.50	M	4167	Disposed	2025-07-06	Ordinary Shares (4167)	Direct
2018-10-01	Stock Option (Right to Buy)	$1.40	M	2604	Disposed	2026-01-31	Ordinary Shares (2604)	Direct

Footnotes

F1: The option exercises and sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person.

F2: The Ordinary Shares may be represented by American Depositary Shares, each of which currently represents one Ordinary Share.

F3: Please see the section titled "Remarks" below for additional information.

F4: The option granted to the Reporting Person is fully vested as of the date hereof.

F5: On February 1, 2017, the Reporting Person was granted an option to purchase 133,000 Ordinary Shares under the Amarin Corporation plc 2011 Stock Incentive Plan (the "Plan"). The shares subject to this option shall vest and become exercisable in 48 equal monthly installments on the last day of each month that began on February 28, 2017.

F6: On July 6, 2015, the Reporting Person was granted an option to purchase 180,000 Ordinary Shares under the Plan. The vesting of the shares is subject to certain performance milestone that was previously achieved. The shares subject to this option shall vest and become exercisable in 48 equal monthly installments on the last day of each month that began on July 31, 2015.

F7: On July 6, 2015, the Reporting Person was granted an option to purchase 200,000 Ordinary Shares under the Plan. The shares subject to this option shall vest and become exercisable in 48 equal monthly installments on the last day of each month that began on July 31, 2015.

F8: On February 1, 2016, the Reporting Person was granted an option to purchase 125,000 Ordinary Shares under the Plan. The shares subject to this option shall vest and become exercisable in 48 equal monthly installments on the last day of each month that began on February 29, 2016.