SEC Form 4 
FORM 4	UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940 	  
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	Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).			
1. Name and Address of Reporting Person*
Ketchum Steven B	

(Last)	(First)	(Middle)	
C/O AMARIN PHARMA, INC.	
1430 ROUTE 206	

(Street) 
BEDMINSTER	NJ	07921	

(City)	(State)	(Zip)	
	2. Issuer Name and Ticker or Trading Symbol 
AMARIN CORP PLC\UK [ AMRN ] 	5. Relationship of Reporting Person(s) to Issuer 
(Check all applicable) 
	Director		10% Owner	
X	Officer (give title below)		Other (specify below)	
Chief Scientific Officer	
		
	3. Date of Earliest Transaction (Month/Day/Year)
01/31/2018 		
	4. If Amendment, Date of Original Filed (Month/Day/Year)	6. Individual or Joint/Group Filing (Check Applicable Line) 
X	Form filed by One Reporting Person	
	Form filed by More than One Reporting Person	
	
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned	
1. Title of Security (Instr. 3) 	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8) 	4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 	5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 	7. Nature of Indirect Beneficial Ownership (Instr. 4) 	
			Code	V	Amount	(A) or (D)	Price				
Ordinary Shares(1) 	01/31/2018		M		60,937(2) 	A	(3)	202,734	D		
Ordinary Shares(1) 	01/31/2018		M		26,667(4) 	A	(3)	229,401	D		
Ordinary Shares(1) 	01/31/2018		M		29,000(5) 	A	(3)	258,401	D		
Ordinary Shares(1) 	01/31/2018		F(6) 		57,428	D	$3.83 	200,973	D		
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities) 	
1. Title of Derivative Security (Instr. 3) 	2. Conversion or Exercise Price of Derivative Security 	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8) 	5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 	6. Date Exercisable and Expiration Date (Month/Day/Year)	7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 	8. Price of Derivative Security (Instr. 5) 	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 	11. Nature of Indirect Beneficial Ownership (Instr. 4) 	
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares					
Restricted Stock Units(7) 	$0.00 	01/31/2018		M			60,937	(2) 	(3) 	Ordinary Shares(1) 	60,937	$0.00 	0(8) 	D		
Restricted Stock Units(7) 	$0.00 	01/31/2018		M			26,667	(4) 	(3) 	Ordinary Shares(1) 	26,667	$0.00 	26,666	D		
Restricted Stock Units(7) 	$0.00 	01/31/2018		M			29,000	(5) 	(3) 	Ordinary Shares(1) 	29,000	$0.00 	58,000	D		
Restricted Stock Units(7) 	$0.00 	02/01/2018		A		78,000		(9) 	(3) 	Ordinary Shares(1) 	78,000	$0.00 	78,000	D		
Stock Option (Right to Buy)	$3.8 	02/01/2018		A		117,000		(10) 	02/01/2028	Ordinary Shares(1) 	117,000	$3.8 	117,000	D		
Explanation of Responses:	
1. The Ordinary Shares may be represented by American Depositary Shares, each of which currently represents one Ordinary Share.	
2. On February 2, 2015, the Reporting Person was granted 182,813 Restricted Stock Units ("RSUs") under the Amarin Corporation plc 2011 Stock Incentive Plan. These RSUs vest in three equal installments on each of January 31, 2016, January 31, 2017 and January 31, 2018. The third and final vesting event occurred on January 31, 2018.	
3. Not applicable.	
4. On February 1, 2016, the Reporting Person was granted 80,000 RSUs under the Amarin Corporation plc 2011 Stock Incentive Plan. These RSUs vest in three equal installments on each of January 31, 2017, January 31, 2018 and January 31, 2019. The second vesting event occurred on January 31, 2018.	
5. On February 1, 2017, the Reporting Person was granted 87,000 RSUs under the Amarin Corporation plc 2011 Stock Incentive Plan. These RSUs vest in three equal installments on each of January 31, 2018, January 31, 2019 and January 31, 2020. The first vesting event occurred on January 31, 2018.	
6. 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.	
7. Each RSU represents a contingent right to receive one Ordinary Share or cash in lieu thereof at the Issuer's discretion.	
8. Please see the section titled "Remarks" below for additional information.	
9. On February 1, 2018, the Reporting Person was granted 78,000 RSUs under the Amarin Corporation plc 2011 Stock Incentive Plan. These RSUs vest in three equal installments on each of January 31, 2019, January 31, 2020 and January 31, 2021.	
10. On February 1, 2018 the Reporting Person was granted an option to purchase 117,000 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, 2018.	
Remarks:	
As of the date of this form 4, the Reporting Person owns or holds the right to acquire an aggregate of 2,756,882 Ordinary Shares of the Issuer in the form of Ordinary Shares, stock options and Restricted Stock Units granted under the Amarin Corporation plc 2002 Stock Option Plan and the Amarin Corporation plc 2011 Stock Incentive Plan. The above-referenced stock option and RSU awards were approved by the Issuer's remuneration committee, in consultation with an independent executive compensation consultant, as part of the Issuer's annual review of executive compensation matters and were benchmarked against the Issuer's pre-defined peer group at the 50th percentile level for long-term incentive awards and other market data. In the event of a Change of Control (as defined in the Amarin Corporation plc 2011 Stock Plan), the grants described in this Form 4 vest in full.	
	/s/ Joseph Kennedy, by power of attorney	02/02/2018	
	** Signature of Reporting Person	Date	
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.	
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).	
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).	
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.	
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