<SEC-DOCUMENT>0000314808-15-000147.txt : 20150603
<SEC-HEADER>0000314808-15-000147.hdr.sgml : 20150603
<ACCEPTANCE-DATETIME>20150603171618
ACCESSION NUMBER:		0000314808-15-000147
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20150602
FILED AS OF DATE:		20150603
DATE AS OF CHANGE:		20150603

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Ensco plc
		CENTRAL INDEX KEY:			0000314808
		STANDARD INDUSTRIAL CLASSIFICATION:	DRILLING OIL & GAS WELLS [1381]
		IRS NUMBER:				980635229
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		6 CHESTERFIELD GARDENS
		CITY:			LONDON
		STATE:			X0
		ZIP:			W1J5BQ
		BUSINESS PHONE:		4402076594660

	MAIL ADDRESS:	
		STREET 1:		6 CHESTERFIELD GARDENS
		CITY:			LONDON
		STATE:			X0
		ZIP:			W1J5BQ

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Ensco International plc
		DATE OF NAME CHANGE:	20091223

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ENSCO INTERNATIONAL INC
		DATE OF NAME CHANGE:	19950526

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ENERGY SERVICE COMPANY INC
		DATE OF NAME CHANGE:	19920703

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Trowell Carl
		CENTRAL INDEX KEY:			0001608903

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-08097
		FILM NUMBER:		15910923

	MAIL ADDRESS:	
		STREET 1:		5847 SAN FELIPE
		STREET 2:		SUITE 3300
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77057
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>wf-form4_143336616773925.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2015-06-02</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000314808</issuerCik>
        <issuerName>Ensco plc</issuerName>
        <issuerTradingSymbol>ESV</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001608903</rptOwnerCik>
            <rptOwnerName>Trowell Carl</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>6 CHESTERFIELD GARDENS</rptOwnerStreet1>
            <rptOwnerStreet2>3RD FLOOR</rptOwnerStreet2>
            <rptOwnerCity>LONDON</rptOwnerCity>
            <rptOwnerState>X0</rptOwnerState>
            <rptOwnerZipCode>W1J 5BQ</rptOwnerZipCode>
            <rptOwnerStateDescription>UNITED KINGDOM</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>CEO &amp; President</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Ordinary Shares</value>
            </securityTitle>
            <transactionDate>
                <value>2015-06-02</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>15870</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>105331</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Ordinary Shares</value>
            </securityTitle>
            <transactionDate>
                <value>2015-06-02</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>F</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>7459</value>
                    <footnoteId id="F2"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>24.46</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>97872</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Restricted Share Units</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2015-06-02</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>15870</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F3"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F3"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Class A Ordinary Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>15870.0</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>107916</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Upon the vesting of our restricted share units, the reporting person is required to pay the aggregate nominal value (par value), $0.10 per share, of our Class A ordinary shares actually issued, in accordance with U.K. corporate law.  In connection with the transaction reported above, the reporting person paid $841.10 to Ensco plc with respect to the shares actually issued upon vesting of the restricted share units.  The remaining 7,459 shares were withheld and not issued to satisfy certain tax withholding obligations.</footnote>
        <footnote id="F2">These shares were withheld to satisfy tax withholding obligations that arose upon vesting.</footnote>
        <footnote id="F3">Of the reporting person's 123,786 restricted stock units, 47,610 restricted stock units vest at a rate of 33 1/3% per annum on the anniversary date of the grant over a three year period and 76,176 restricted stock units vest 100% on the third anniversary of the date of grant.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Davor S. Vukadin, by Power of Attorney</signatureName>
        <signatureDate>2015-06-03</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>substitutepoa-officers29ma.htm
<DESCRIPTION>SUBSTITUTE POA - OFFICER (2015.MAY.29)
<TEXT>
<!-- Document created using Workiva -->
<html>
<body>
<pre>
Ensco plc
Substitute Power of Attorney
Pursuant to the powers of attorney, copies of which were previously filed with the Securities and Exchange Commission (the "SEC") on the dates listed below (collectively, the "Powers of Attorney"), each of the following officers and/or directors of Ensco plc, a public limited company organized under the laws of England and Wales (the "Company"), on the dates indicated below next to such person's name, appointed Elizabeth A. Cook as such person's true and lawful attorney-in-fact and agent, with full power of substitution and resubstitution, to do and perform every act whatsoever necessary or desirable to be done in the exercise of the rights and powers granted in the Power of Attorney executed by such person:

Name            Executed        Filed with SEC
Steven Joseph Brady    June 28, 2013        September 6, 2013
John Mark Burns        June 25, 2013        September 6, 2013
Robert W. Edwards, III    June 27, 2013        July 11, 2013
David Ethan Hensel    January 13, 2014    January 16, 2014
John Stokes Knowlton    June 27, 2013        August 5, 2013
Brady K. Long        June 28, 2013        February 14, 2014
Patrick Carey Lowe    June 28, 2013        November 20, 2013
Gilles Luca        December 1, 2014    December 3, 2014
James W. Swent, III    June 28, 2013        August 5, 2013
Carl Trowell        May 21, 2014        June 2, 2014


The undersigned, pursuant to the powers granted in the Powers of Attorney, hereby constitutes and appoints Davor S. Vukadin as substitute to the undersigned attorney-in-fact, with full power and authority to do and perform every act without any other and with full power of substitution and resubstitution, to exercise and execute all of the powers granted to the undersigned in the Powers of Attorney.  For the avoidance of doubt, the foregoing appointment shall not serve as a revocation of the powers granted to the undersigned in the Powers of Attorney.

This Substitute Power of Attorney shall remain in full force and effect with respect to each individual listed above, until the underlying Power of Attorney is revoked or terminated, unless earlier revoked by the undersigned in a signed writing.

IN WITNESS THEREOF, the undersigned has caused this Substitute Power of Attorney to be executed as of this 29th day of May, 2015.



By: /s/ Elizabeth A. Cook

Name: Elizabeth A. Cook
Title: Attorney-in-Fact

</pre>
</body>
</html>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
