FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person * THERO JOHN F   2. Issuer Name and Ticker or Trading Symbol AMARIN CORP PLC\UK [AMRN] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) President and CEO (Last) (First) (Middle) C/O AMARIN PHARMA, INC., 1430 ROUTE 206 3. Date of Earliest Transaction (Month/Day/Year) 01/31/2019 (Street) BEDMINSTER, NJ 07921 4. If Amendment, Date 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 (City) (State) (Zip) 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) (2) 01/31/2019   M   120,000 (3) A (4) 2,237,271 D (5)   Ordinary Shares (1) (2) 01/31/2019   M   119,667 (6) A (4) 2,356,938 D (5)   Ordinary Shares (1) (2) 01/31/2019   M   123,667 (7) A (4) 2,480,605 D (5)   Ordinary Shares (1) (2) 01/31/2019   F(8)   143,177 D $ 16.94 2,337,428 D (5)

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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 Underlying Securities (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 of Derivative Security: 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 (9)	$ 0	01/31/2019		M			120,000	(3)	(4)	Ordinary Shares (2)	120,000	$ 0	0	D
Restricted Stock Units (9)	$ 0	01/31/2019		M			119,667	(6)	(4)	Ordinary Shares (2)	119,667	$ 0	119,666	D
Restricted Stock Units (9)	$ 0	01/31/2019		M			123,667	(7)	(4)	Ordinary Shares (2)	123,667	$ 0	247,333	D
Restricted Stock Units (9)	$ 0	02/01/2019		A		216,100		(10)	(4)	Ordinary Shares (2)	216,100	$ 0	216,100	D
Stock Option (Right to Buy)	$ 16.88	02/01/2019		A		302,500		(11)	02/01/2029	Ordinary Shares (2)	302,500	$ 0	302,500	D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
THERO JOHN F C/O AMARIN PHARMA, INC. 1430 ROUTE 206 BEDMINSTER, NJ 07921	X		President and CEO

Signatures

/s/ Joseph Kennedy, by power of attorney		02/01/2019
**Signature of Reporting Person		Date

Explanation of Responses:

*	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).
(1)	There are no market sales of securities reported on this Form 4.
(2)	The Ordinary Shares may be represented by American Depositary Shares, each of which currently represents one Ordinary Share.
(3)	On February 1, 2016, the Reporting Person was granted 360,000 Restricted Stock Units ("RSUs") under the Amarin Corporation plc 2011 Stock Incentive Plan (the "Plan"). These RSUs vest in three equal installments on each of January 31, 2017, January 31, 2018 and January 31, 2019. The third and final vesting event occurred on January 31, 2019.
(4)	Not applicable.
(5)	Please see the section titled "Remarks" below for additional information.
(6)	On February 1, 2017, the Reporting Person was granted 359,000 RSUs under the Plan. These RSUs vest in three equal installments on each of January 31, 2018, January 31, 2019 and January 31, 2020. The second vesting event occurred on January 31, 2019.
(7)	On February 1, 2018, the Reporting Person was granted 371,000 RSUs under the Plan. These RSUs vest in three equal installments on each of January 31, 2019, January 31, 2020 and January 31, 2021. The first vesting event occurred on January 31, 2019.
(8)	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.
(9)	Each RSU represents a contingent right to receive one Ordinary Share or cash in lieu thereof at the Issuer's discretion.
(10)	On February 1, 2019, the Reporting Person was granted 216,100 RSUs under the Plan. These RSUs vest in three equal installments on each of January 31, 2020, January 31, 2021 and January 31, 2022.
(11)	On February 1, 2019, the Reporting Person was granted an option to purchase 302,500 Ordinary Shares under the Plan. The shares subject to this option shall vest and become exercisable in 16 equal quarterly installments starting on May 15, 2019.
Remarks: In the case of a Change of Control (as defined in the Plan), the grants described in this Form 4 vest in full. As of the date of this Form 4, the Reporting Person owns or holds the right to acquire an aggregate of 10,484,507 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 Plan.

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