<SEC-DOCUMENT>0001137789-17-000083.txt : 20171027
<SEC-HEADER>0001137789-17-000083.hdr.sgml : 20171027
<ACCEPTANCE-DATETIME>20171027150404
ACCESSION NUMBER:		0001137789-17-000083
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20171017
FILED AS OF DATE:		20171027
DATE AS OF CHANGE:		20171027

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Nygaard Jeffrey D.
		CENTRAL INDEX KEY:			0001720273

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-31560
		FILM NUMBER:		171159175

	MAIL ADDRESS:	
		STREET 1:		10200 S. DEANZA BLVD.
		CITY:			CUPERTINO
		STATE:			CA
		ZIP:			95014

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Seagate Technology plc
		CENTRAL INDEX KEY:			0001137789
		STANDARD INDUSTRIAL CLASSIFICATION:	COMPUTER STORAGE DEVICES [3572]
		IRS NUMBER:				980648577
		STATE OF INCORPORATION:			L2
		FISCAL YEAR END:			0630

	BUSINESS ADDRESS:	
		STREET 1:		38/39 FITZWILLIAM SQUARE
		CITY:			DUBLIN 2
		STATE:			L2
		ZIP:			00000
		BUSINESS PHONE:		(353) (1) 234-3136

	MAIL ADDRESS:	
		STREET 1:		38/39 FITZWILLIAM SQUARE
		CITY:			DUBLIN 2
		STATE:			L2
		ZIP:			00000

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Seagate Technology
		DATE OF NAME CHANGE:	20090330

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	SEAGATE TECHNOLOGY
		DATE OF NAME CHANGE:	20021212

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	SEAGATE TECHNOLOGY HOLDINGS
		DATE OF NAME CHANGE:	20010406
</SEC-HEADER>
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<TYPE>3
<SEQUENCE>1
<FILENAME>wf-form3_150913103012437.xml
<DESCRIPTION>FORM 3
<TEXT>
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    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2017-10-17</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001137789</issuerCik>
        <issuerName>Seagate Technology plc</issuerName>
        <issuerTradingSymbol>STX</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001720273</rptOwnerCik>
            <rptOwnerName>Nygaard Jeffrey D.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>10200 S. DE ANZA BOULEVARD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>CUPERTINO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>95014</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Executive Vice President</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Ordinary Shares</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>18133</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>Jeffrey D. Nygaard Revocable Trust U/A Dated August 17, 2009</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>NQ Stock Option</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>30.95</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <value>2024-09-11</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Ordinary Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>24870.0</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
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        <derivativeHolding>
            <securityTitle>
                <value>NQ Stock Option</value>
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            <conversionOrExercisePrice>
                <value>36.09</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <value>2023-09-09</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Ordinary Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>30310.0</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
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        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>NQ Stock Option</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>50.1</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F3"/>
            </exerciseDate>
            <expirationDate>
                <value>2022-09-09</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Ordinary Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>9380.0</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>NQ Stock Option</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>60.83</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F4"/>
            </exerciseDate>
            <expirationDate>
                <value>2021-09-09</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Ordinary Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>7800.0</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
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        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>NQ Stock Option</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>40.16</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F5"/>
            </exerciseDate>
            <expirationDate>
                <value>2020-09-09</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Ordinary Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>10969.0</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>NQ Stock Option</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>29.87</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F6"/>
            </exerciseDate>
            <expirationDate>
                <value>2019-09-10</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Ordinary Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>2188.0</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Performance-Based Restricted Share Units</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>0.0</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F7"/>
            </exerciseDate>
            <expirationDate>
                <value>2020-09-11</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Ordinary Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>8705.0</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Performance-Based Restricted Share Units</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>0.0</value>
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            <exerciseDate>
                <footnoteId id="F8"/>
            </exerciseDate>
            <expirationDate>
                <value>2019-09-09</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Ordinary Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>10610.0</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Performance-Based Restricted Share Units</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>0.0</value>
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            <exerciseDate>
                <footnoteId id="F9"/>
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            <expirationDate>
                <value>2018-09-09</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Ordinary Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>4380.0</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
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        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Restricted Share Unit</value>
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            <conversionOrExercisePrice>
                <value>0.0</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F10"/>
            </exerciseDate>
            <expirationDate>
                <value>2021-09-11</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Ordinary Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>9950.0</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Restricted Share Unit</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>0.0</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F11"/>
            </exerciseDate>
            <expirationDate>
                <value>2020-09-09</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Ordinary Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>9094.0</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Restricted Share Unit</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>0.0</value>
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            <exerciseDate>
                <footnoteId id="F12"/>
            </exerciseDate>
            <expirationDate>
                <value>2019-09-09</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Ordinary Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>2503.0</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
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        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Restricted Share Unit</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>0.0</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F13"/>
            </exerciseDate>
            <expirationDate>
                <value>2018-09-09</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Ordinary Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>1040.0</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Options granted to the Reporting Person under the Seagate Technology plc 2012 Equity Incentive Plan are subject to a four-year vesting schedule. Subject to continuous employment, one quarter of the options will vest on September 11, 2018. The remaining options will vest in equal monthly installments over the 36 months following September 11, 2018.</footnote>
        <footnote id="F2">Options granted to the Reporting Person under the Seagate Technology plc 2012 Equity Incentive Plan are subject to a four-year vesting schedule. Subject to continuous employment, one quarter of the options vested on September 9, 2017. The remaining options will vest in equal monthly installments over the 36 months following September 9, 2017.</footnote>
        <footnote id="F3">Options granted to the Reporting Person under the Seagate Technology plc 2012 Equity Incentive Plan are subject to a four-year vesting schedule. Subject to continuous employment, one quarter of the options vested on September 9, 2016. The remaining options will vest in equal monthly installments over the 36 months following September 9, 2016.</footnote>
        <footnote id="F4">Options granted to the Reporting Person under the Seagate Technology plc 2012 Equity Incentive Plan are subject to a four-year vesting schedule. Subject to continuous employment, one quarter of the options vested on September 9, 2015. The remaining options will vest in equal monthly installments over the 36 months following September 9, 2015.</footnote>
        <footnote id="F5">Options granted to the Reporting Person under the Seagate Technology plc 2012 Equity Incentive Plan are subject to a four-year vesting schedule. Subject to continuous employment, one quarter of the options vested on September 9, 2014. The remaining options vested in equal monthly installments over the 36 months following September 9, 2014.</footnote>
        <footnote id="F6">Options granted to the Reporting Person under the Seagate Technology plc 2012 Equity Incentive Plan are subject to a four-year vesting schedule. Subject to continuous employment, one quarter of the options vested on September 10, 2013. The remaining options vested in equal monthly installments over the 36 months following September 10, 2013.</footnote>
        <footnote id="F7">Each performance-based restricted share unit (&quot;PSU&quot;) represents a contingent right to receive one share of Seagate Technology plc's ordinary share. The number of PSUs that may be earned is between 0% and 200% of the target number of PSUs and shall vest based on ROIC and relative TSR performance over the three-year performance period ending on September 11, 2020.</footnote>
        <footnote id="F8">Each performance-based restricted share unit (&quot;PSU&quot;) represents a contingent right to receive one share of Seagate Technology plc's ordinary share. The number of PSUs that may be earned is between 0% and 200% of the target number of PSUs and shall vest based on ROIC and relative TSR performance over the three-year performance period ending on September 9, 2019.</footnote>
        <footnote id="F9">Each performance-based restricted share unit (&quot;PSU&quot;) represents a contingent right to receive one share of Seagate Technology plc's ordinary share. The number of PSUs that may be earned is between 0% and 200% of the target number of PSUs and shall vest based on ROIC and relative TSR performance over the three-year performance period ending on September 9, 2018.</footnote>
        <footnote id="F10">Consists of a grant of restricted share units (&quot;RSUs&quot;) awarded to the Reporting Person under the Seagate Technology plc 2012 Equity Incentive Plan. The RSUs will be converted into ordinary shares on a one-for-one basis. Subject to the Reporting Person's continuous employment, such RSUs will be settled in ordinary shares in equal installments on each of the first four anniversaries of September 11, 2017.</footnote>
        <footnote id="F11">Consists of a grant of restricted share units (&quot;RSUs&quot;) awarded to the Reporting Person under the Seagate Technology plc 2012 Equity Incentive Plan. The RSUs will be converted into ordinary shares on a one-for-one basis. Subject to the Reporting Person's continuous employment, such RSUs will be settled in ordinary shares in equal installments on each of the first four anniversaries of September 9, 2016.</footnote>
        <footnote id="F12">Consists of a grant of restricted share units (&quot;RSUs&quot;) awarded to the Reporting Person under the Seagate Technology plc 2012 Equity Incentive Plan. The RSUs will be converted into ordinary shares on a one-for-one basis. Subject to the Reporting Person's continuous employment, such RSUs will be settled in ordinary shares in equal installments on each of the first four anniversaries of September 9, 2015.</footnote>
        <footnote id="F13">Consists of a grant of restricted share units (&quot;RSUs&quot;) awarded to the Reporting Person under the Seagate Technology plc 2012 Equity Incentive Plan. The RSUs will be converted into ordinary shares on a one-for-one basis. Subject to the Reporting Person's continuous employment, such RSUs will be settled in ordinary shares in equal installments on each of the first four anniversaries of September 9, 2014.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Suhani Akhare Attorney-in-Fact for Jeffrey D. Nygaard</signatureName>
        <signatureDate>2017-10-27</signatureDate>
    </ownerSignature>
</ownershipDocument>
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<SEQUENCE>2
<FILENAME>nygaardpowerofattorney10-1.htm
<DESCRIPTION>JEFFREY NYGAARD POWER OF ATTORNEY
<TEXT>
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<pre>
POWER OF ATTORNEY


    KNOW ALL BY THESE PRESENTS, that the undersigned hereby constitutes and appoints each of Kevin M. Cope, Suhan Akhare, Nina J. Chellew, and Jolene A. Mendelsohn, signing singly, the undersigned's true and lawful attorney-in-fact to:

    (1)    execute for and on behalf of the undersigned a Form ID Application, if required, and submit the same to the United States Securities and Exchange Commission;

    (2)    execute for and on behalf of the undersigned, in the undersigned's capacity as an officer and/or director of Seagate Technology (the "Company") or as a holder of 10% or more of the Company's securities, Forms 3, 4 and 5, and any amendments thereto, in accordance with Section 16 of the Securities Exchange Act of 1934, as amended, and the rules thereunder and, if necessary, such forms or similar reports required by foreign regulators;

    (3)    do and perform any and all acts for and on behalf of the undersigned that may be necessary or desirable to complete and execute any such Form 3, 4 or 5 or similar form or report required by foreign regulators, and any amendments thereto, and timely file such form or report with the United States Securities and Exchange Commission and any stock exchange or similar authority or appropriate foreign regulator; and

    (4)    take any other action of any type whatsoever in connection with the foregoing that, in the opinion of such attorney-in-fact, may be of benefit to, in the best interest of or legally required to be done by the undersigned, it being understood that the documents executed by such attorney-in-fact on behalf of the undersigned pursuant to this Power of Attorney shall be in such form and shall contain such terms and conditions as such attorney-in-fact may approve in such attorney-in-fact's discretion.

    The undersigned hereby grants to each such attorney-in-fact full power and authority to do and perform any and every act and thing whatsoever requisite, necessary or proper to be done in the exercise of any of the rights and powers herein granted, as fully to all intents and purposes as the undersigned might or could do if personally present, with full power of substitution or revocation, hereby ratifying and confirming all that such attorney-in-fact, or such attorney-in-fact's substitute or substitutes, shall lawfully do or cause to be done by virtue of this Power of Attorney and the rights and powers herein granted.  The undersigned acknowledges that the foregoing attorneys-in-fact, in serving in such capacity at the request of the undersigned, are not assuming, nor is the Company assuming, any of the undersigned's responsibilities to comply with Section 16 of the Securities Exchange Act of 1934, as amended, and the rules thereunder.

    This Power of Attorney shall remain in full force and effect until the undersigned is no longer required to file Forms 3, 4 and 5 with respect to the undersigned's holdings of and transactions in securities issued by the Company, unless earlier revoked by the undersigned in a signed writing delivered to the foregoing attorneys-in-fact.

    IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of the date written below.

Date:      October 18, 2017


By:


/s/ Jeffrey D. Nygaard

Name:
Jeffrey D. Nygaard

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