<SEC-DOCUMENT>0001562180-20-001797.txt : 20200227
<SEC-HEADER>0001562180-20-001797.hdr.sgml : 20200227
<ACCEPTANCE-DATETIME>20200227200257
ACCESSION NUMBER:		0001562180-20-001797
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20200225
FILED AS OF DATE:		20200227
DATE AS OF CHANGE:		20200227

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:		20665035

	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:		FIRST FLOOR, BLOCK 3, THE OVAL,
		STREET 2:		SHELBOURNE ROAD, BALLSBRIDGE
		CITY:			DUBLIN
		STATE:			L2
		ZIP:			00000
		BUSINESS PHONE:		353 1 6699 020

	MAIL ADDRESS:	
		STREET 1:		FIRST FLOOR, BLOCK 3, THE OVAL,
		STREET 2:		SHELBOURNE ROAD, BALLSBRIDGE
		CITY:			DUBLIN
		STATE:			L2
		ZIP:			00000

	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>2020-02-25</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>

    <nonDerivativeTable>
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                <value>Ordinary Shares</value>
                <footnoteId id="F1"/>
            </securityTitle>
            <transactionDate>
                <value>2020-02-25</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
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                <equitySwapInvolved>false</equitySwapInvolved>
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            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
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                </transactionShares>
                <transactionPricePerShare>
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                <transactionAcquiredDisposedCode>
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            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>90124.00</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>17.58</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
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    <derivativeTable>
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                <footnoteId id="F6"/>
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            <conversionOrExercisePrice>
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            <transactionDate>
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                <transactionCode>A</transactionCode>
                <equitySwapInvolved>false</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>242500.00</value>
                </transactionShares>
                <transactionPricePerShare>
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                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
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            <expirationDate>
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                <underlyingSecurityTitle>
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                    <footnoteId id="F1"/>
                </underlyingSecurityTitle>
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                    <value>242500.00</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
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                <sharesOwnedFollowingTransaction>
                    <value>242500.00</value>
                </sharesOwnedFollowingTransaction>
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                <directOrIndirectOwnership>
                    <value>D</value>
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        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Restricted Stock Units</value>
                <footnoteId id="F6"/>
            </securityTitle>
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            <transactionDate>
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            </transactionDate>
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            <transactionTimeliness></transactionTimeliness>
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                <transactionPricePerShare>
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                <transactionAcquiredDisposedCode>
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                <underlyingSecurityTitle>
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                    <footnoteId id="F1"/>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
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                </underlyingSecurityShares>
            </underlyingSecurity>
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                <sharesOwnedFollowingTransaction>
                    <value>127985.00</value>
                </sharesOwnedFollowingTransaction>
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        <derivativeTransaction>
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                <equitySwapInvolved>false</equitySwapInvolved>
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            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
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                </transactionShares>
                <transactionPricePerShare>
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                </transactionPricePerShare>
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                    <footnoteId id="F1"/>
                </underlyingSecurityTitle>
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                </underlyingSecurityShares>
            </underlyingSecurity>
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                <sharesOwnedFollowingTransaction>
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                </sharesOwnedFollowingTransaction>
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                </directOrIndirectOwnership>
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            <securityTitle>
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            </securityTitle>
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            </transactionDate>
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                <equitySwapInvolved>false</equitySwapInvolved>
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                </transactionShares>
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                    <value>D</value>
                </transactionAcquiredDisposedCode>
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                <footnoteId id="F3"/>
            </expirationDate>
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                    <footnoteId id="F1"/>
                </underlyingSecurityTitle>
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                    <value>114515.00</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
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                    <value>127985.00</value>
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    <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">On May 15, 2017, the Reporting Person was granted 970,000 Restricted Stock Units (&quot;RSUs&quot;) under the Amarin Corporation plc 2011 Stock Incentive Plan (the &quot;Plan&quot;). These RSUs consist of three tranches representing 25%, 25% and 50% of the total award. Each tranche vests ratably over 36 months beginning Sept. 30, 2018 subject to achievement of certain prespecified performance criteria and continued employment of the Reporting Person as provided in the RSU Award Agreement between the Issuer and Reporting Person. On Feb. 25, 2020, pursuant to reporting of audited net total revenue for 2019 exceeding $400 million, the performance criteria related to both 25% tranches was deemed to be achieved, resulting in the vesting of 114,515 RSUs per tranche. The remaining RSUs in these two tranches will continue to vest over 19 monthly installments. The performance criteria related to the 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 9,583,606 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>2020-02-27</signatureDate>
    </ownerSignature>
</ownershipDocument>
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</SEC-DOCUMENT>
