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 * Zakrzewski Joseph S   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) Chief Executive Officer (Last) (First) (Middle) C/O AMARIN PHARMA, INC., 1430 ROUTE 206, SUITE 200 3. Date of Earliest Transaction (Month/Day/Year) 07/26/2012 (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) 07/26/2012   A   33,333 A $ 0 (2) 111,937 D   Ordinary Shares (1) 07/27/2012   M   150,000 A $ 1.35 261,937 D   Ordinary Shares (1) 07/27/2012   S(4)   71,946 D $ 14.58 (5) 189,991 D   Ordinary Shares (1) 07/27/2012   S(4)   78,054 D $ 14.07 (8) 111,937 D

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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

$ 0 (7)

07/26/2012

A

33,333

(3)

(3)

Ordinary Shares (1)

33,333

$ 0

33,333

D

Stock Option (right to buy)

$ 1.35

07/27/2012

M

150,000

(6)

12/21/2019

Ordinary Shares (1)

150,000

$ 0

215,000

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Zakrzewski Joseph S C/O AMARIN PHARMA, INC. 1430 ROUTE 206, SUITE 200 BEDMINSTER, NJ 07921	X		Chief Executive Officer

Signatures

/s/ Frederick Ahlholm, by power of attorney		07/30/2012
**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)	The Ordinary Shares may be represented by American Depositary Shares, each of which currently represents one Ordinary Share.
(2)	On February 1, 2012, the Reporting Person was granted 200,000 restricted stock units (the "RSUs") under the Amarin Corporation plc 2011 Stock Incentive Plan. Each RSU represents a contingent right to receive one Ordinary Share or cash in lieu thereof at the Issuer's discretion. The RSUs vest in six equal installments based on the Issuer's satisfaction of certain performance criteria and continued employment of the Reporting Person as provided in the Restricted Stock Unit Award Agreement between the Issuer and the Reporting Person. The performance criteria for the first installment was met, resulting in vesting of 33,333 RSUs.
(3)	These RSUs vest on July 26, 2013, subject to continued employment of the Reporting Person through such date. Ordinary Shares will be delivered to the Reporting Person as soon as practicable after the vesting date.
(4)	The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 9, 2012.
(5)	The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $15.32 to $14.33, 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.
(6)	On December 21, 2009, the Reporting Person was granted an option to purchase 1,170,000 ordinary shares under the Amarin Corporation plc 2002 Stock Option Plan. The stock option initally vested in four equal annual installments beginning on January 1, 2010. In December 2010, the Issuer's Board of Directors approved the acceleration of the vesting of this award by six months such that the option vested in four equal installments and became fully vested on July 1, 2012.
(7)	Each RSU represents a contingent right to receive one Ordinary Share or cash in lieu thereof at the Issuer's discretion.
(8)	The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $14.32 to $13.54, inclusive.

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