<SEC-DOCUMENT>0001562180-20-005255.txt : 20200731
<SEC-HEADER>0001562180-20-005255.hdr.sgml : 20200731
<ACCEPTANCE-DATETIME>20200731200341
ACCESSION NUMBER:		0001562180-20-005255
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20200731
FILED AS OF DATE:		20200731
DATE AS OF CHANGE:		20200731

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			THERO JOHN F
		CENTRAL INDEX KEY:			0001199637

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-21392
		FILM NUMBER:		201067516

	MAIL ADDRESS:	
		STREET 1:		C/O AMARIN PHARMA, INC.
		STREET 2:		1430 ROUTE 6
		CITY:			BEDMINSTER
		STATE:			NJ
		ZIP:			07921

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			AMARIN CORP PLC\UK
		CENTRAL INDEX KEY:			0000897448
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			X0
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		SPACES SOUTH DOCKLANDS, BLOCK C
		STREET 2:		77 SIR JOHN ROGERSON'S QUAY
		CITY:			DUBLIN 2
		STATE:			L2
		ZIP:			D02 VK60
		BUSINESS PHONE:		353 1 6699 020

	MAIL ADDRESS:	
		STREET 1:		SPACES SOUTH DOCKLANDS, BLOCK C
		STREET 2:		77 SIR JOHN ROGERSON'S QUAY
		CITY:			DUBLIN 2
		STATE:			L2
		ZIP:			D02 VK60

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	AMARIN PHARMACEUTICALS PLC
		DATE OF NAME CHANGE:	20000201

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ETHICAL HOLDINGS PLC
		DATE OF NAME CHANGE:	19930322
</SEC-HEADER>
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<SEQUENCE>1
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<DESCRIPTION>PRIMARY DOCUMENT
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    <periodOfReport>2020-07-31</periodOfReport>

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    <issuer>
        <issuerCik>0000897448</issuerCik>
        <issuerName>AMARIN CORP PLC\UK</issuerName>
        <issuerTradingSymbol>AMRN</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001199637</rptOwnerCik>
            <rptOwnerName>THERO JOHN F</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O AMARIN PHARMA, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>440 US HIGHWAY 22</rptOwnerStreet2>
            <rptOwnerCity>BRIDGEWATER</rptOwnerCity>
            <rptOwnerState>NJ</rptOwnerState>
            <rptOwnerZipCode>08807</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>true</isDirector>
            <isOfficer>true</isOfficer>
            <isTenPercentOwner>false</isTenPercentOwner>
            <isOther>false</isOther>
            <officerTitle>President and CEO</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

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                <transactionPricePerShare>
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                <transactionAcquiredDisposedCode>
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                <transactionShares>
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                <transactionPricePerShare>
                    <value>6.59</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
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                <footnoteId id="F6"/>
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                    <footnoteId id="F1"/>
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                </underlyingSecurityShares>
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                    <value>87569.00</value>
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                <value>Restricted Stock Units</value>
                <footnoteId id="F6"/>
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                    <footnoteId id="F1"/>
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                    <value>6736.00</value>
                </underlyingSecurityShares>
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                    <value>87569.00</value>
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                </directOrIndirectOwnership>
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        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The Ordinary Shares may be represented by American Depositary Shares, each of which currently represents one Ordinary Share.</footnote>
        <footnote id="F2">As previously reported on February 27, 2020, on May 15, 2017, the Reporting Person was granted 970,000 Restricted Stock Units (&quot;RSUs&quot;) under the Amarin Corporation plc Stock Incentive Plan (the &quot;Plan&quot;), of which the performance criteria related to two tranches representing 50% of the total award was deemed achieved on February 25, 2020 pursuant to reporting of audited net product revenues for 2019 exceeding $400 million. The tranches vest ratably over 36 months beginning September 30, 2018 subject to achievement of the performance criteria and continued employment of the Reporting Person as provided in the RSU Award Agreement between the Issuer and Reporting Person. The twenty-third vesting event occurred on July 31, 2020. The performance criteria related to the remaining 50% tranche has not yet been achieved; such tranche has not lapsed as a result of achieving the other two tranches.</footnote>
        <footnote id="F3">Not applicable.</footnote>
        <footnote id="F4">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.</footnote>
        <footnote id="F5">Please see the section titled &quot;Remarks&quot; below for additional information.</footnote>
        <footnote id="F6">Each RSU represents a contingent right to receive one Ordinary Share or cash in lieu thereof at the Issuer's discretion.</footnote>
    </footnotes>

    <remarks>As of the date of this Form 4, the Reporting Person owns or holds the right to acquire an aggregate of 9,529,892 Ordinary Shares of the Issuer in the form of Ordinary Shares, stock options and RSUs granted under the Plan, including but not limited to certain performance-based RSUs that are earned only if product revenues reach pre-defined annual milestone levels and, in certain cases, then vest only if the recipient remains with the company for an extended period of time.</remarks>

    <ownerSignature>
        <signatureName>/s/ John F. Thero</signatureName>
        <signatureDate>2020-07-31</signatureDate>
    </ownerSignature>
</ownershipDocument>
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</SEC-DOCUMENT>
