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: 2018-09-30

Reporting Person: Kennedy Joseph T (General Counsel)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2018-09-30	Ordinary Shares	M	47188	—	Acquired	265122	Direct
2018-09-30	Ordinary Shares	M	6250	—	Acquired	271372	Direct
2018-09-30	Ordinary Shares	F	26495	$16.27	Disposed	244877	Direct
2018-10-01	Ordinary Shares	M	1953	$1.02	Acquired	246830	Direct
2018-10-01	Ordinary Shares	M	18749	$2.50	Acquired	265579	Direct
2018-10-01	Ordinary Shares	M	2604	$1.40	Acquired	268183	Direct
2018-10-01	Ordinary Shares	S	33049	$16.3304	Disposed	235134	Direct
2018-10-01	Ordinary Shares	S	8800	$17.4654	Disposed	226334	Direct
2018-10-01	Ordinary Shares	S	8400	$17.9916	Disposed	217934	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2018-09-30	Restricted Stock Units	$0.00	M	47188	Disposed		Ordinary Shares (47188)	Direct
2018-09-30	Restricted Stock Units	$0.00	M	6250	Disposed		Ordinary Shares (6250)	Direct
2018-10-01	Stock Option (Right to Buy)	$1.02	M	1953	Disposed	2025-02-01	Ordinary Shares (1953)	Direct
2018-10-01	Stock Option (Right to Buy)	$2.50	M	18749	Disposed	2025-07-06	Ordinary Shares (18749)	Direct
2018-10-01	Stock Option (Right to Buy)	$1.40	M	2604	Disposed	2026-01-31	Ordinary Shares (2604)	Direct

Footnotes

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

F2: As previously reported on July 8, 2015, the Reporting Person was granted 755,000 Restricted Stock Units ("RSUs") under the Amarin Corporation plc 2011 Stock Incentive Plan (the "Plan"). These RSUs vest in 16 equal quarterly installments. The thirteenth vesting event occurred on September 30, 2018.

F3: Not applicable.

F4: Please see the section titled "Remarks" below for additional information.

F5: As previously reported on October 6, 2015, the Reporting Person was granted 100,000 RSUs under the Plan. These RSUs vest in 16 equal quarterly installments. The thirteenth vesting event occurred on September 30, 2018.

F6: Represents withholding by the Issuer of shares in respect of tax liability incident to the vesting of a security issued in accordance with Rule 16b-3, and not a market sale of securities.

F7: 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.

F8: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $15.80 to $16.78, 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.

F9: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $16.80 to $17.79, 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.

F10: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $17.80 to $18.45, 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.

F11: Each RSU represents a contingent right to receive one Ordinary Share or cash in lieu thereof at the Issuer's discretion.

F12: On February 2, 2015, the Reporting Person was granted an option to purchase 93,750 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, 2015.

F13: On July 6, 2015, the Reporting Person was granted an option to purchase 900,000 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.

F14: 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.