AMARIN CORP PLC\UK — Director's Dealing 2018

Sep 26, 2018

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AMARIN CORP PLC\UK (AMRN)
CIK: 0000897448
Period of Report: 2018-09-24

Reporting Person: Ketchum Steven B (Chief Scientific Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2018-09-24	Ordinary Shares	M	20834	$1.40	Acquired	421307	Direct
2018-09-24	Ordinary Shares	M	158334	$2.50	Acquired	579641	Direct
2018-09-24	Ordinary Shares	M	112500	$2.50	Acquired	692141	Direct
2018-09-24	Ordinary Shares	M	142500	$2.50	Acquired	834641	Direct
2018-09-24	Ordinary Shares	M	52147	$2.95	Acquired	886788	Direct
2018-09-24	Ordinary Shares	M	33750	$8.10	Acquired	920538	Direct
2018-09-24	Ordinary Shares	M	100000	$8.77	Acquired	1020538	Direct
2018-09-24	Ordinary Shares	S	529791	$10.0401	Disposed	490747	Direct
2018-09-24	Ordinary Shares	S	49450	$10.9377	Disposed	441297	Direct
2018-09-24	Ordinary Shares	S	100000	$12.00	Disposed	341297	Direct
2018-09-25	Ordinary Shares	M	200000	$8.77	Acquired	541297	Direct
2018-09-25	Ordinary Shares	S	100000	$13.00	Disposed	441297	Direct
2018-09-25	Ordinary Shares	S	100000	$14.00	Disposed	341297	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2018-09-24	Stock Option (Right to Buy)	$1.40	M	20834	Disposed	2026-01-31	Ordinary Shares (20834)	Direct
2018-09-24	Stock Option (Right to Buy)	$2.50	M	158334	Disposed	2025-07-06	Ordinary Shares (158334)	Direct
2018-09-24	Stock Option (Right to Buy)	$2.50	M	112500	Disposed	2025-07-06	Ordinary Shares (112500)	Direct
2018-09-24	Stock Option (Right to Buy)	$2.50	M	142500	Disposed	2025-07-06	Ordinary Shares (142500)	Direct
2018-09-24	Stock Option (Right to Buy)	$2.95	M	52147	Disposed	2027-01-31	Ordinary Shares (52147)	Direct
2018-09-24	Stock Option (Right to Buy)	$8.10	M	33750	Disposed	2023-01-02	Ordinary Shares (33750)	Direct
2018-09-24	Stock Option (Right to Buy)	$8.77	M	100000	Disposed	2022-03-01	Ordinary Shares (100000)	Direct
2018-09-25	Stock Option (Right to Buy)	$8.77	M	200000	Disposed	2022-03-01	Ordinary Shares (200000)	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 price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $9.55 to $10.54, 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.

F5: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $10.57 to $11.09, 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.

F6: On February 1, 2016, the Reporting Person was granted an option to purchase 125,000 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 29, 2016.

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 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.

F9: On February 1, 2017, the Reporting Person was granted an option to purchase 133,000 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 28, 2017.

F10: The option granted to the Reporting Person is fully vested as of the date hereof.