<SEC-DOCUMENT>0001415889-25-018367.txt : 20250627
<SEC-HEADER>0001415889-25-018367.hdr.sgml : 20250627
<ACCEPTANCE-DATETIME>20250627161332
ACCESSION NUMBER:		0001415889-25-018367
CONFORMED SUBMISSION TYPE:	4/A
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20250621
FILED AS OF DATE:		20250627
DATE AS OF CHANGE:		20250627

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			COTE JEFFREY J
		CENTRAL INDEX KEY:			0001196701
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		4/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-36473
		FILM NUMBER:		251086433

	MAIL ADDRESS:	
		STREET 1:		C/O TRINSEO PLC
		STREET 2:		440 EAST SWEDESFORD ROAD, SUITE 301
		CITY:			WAYNE
		STATE:			PA
		ZIP:			19087

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Trinseo PLC
		CENTRAL INDEX KEY:			0001519061
		STANDARD INDUSTRIAL CLASSIFICATION:	PLASTICS, MATERIALS, SYNTH RESINS & NONVULCAN ELASTOMERS [2821]
		ORGANIZATION NAME:           	08 Industrial Applications and Services
		EIN:				000000000
		STATE OF INCORPORATION:			L2
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		440 EAST SWEDESFORD ROAD
		STREET 2:		SUITE 301
		CITY:			WAYNE
		STATE:			PA
		ZIP:			19087
		BUSINESS PHONE:		610-240-3200

	MAIL ADDRESS:	
		STREET 1:		440 EAST SWEDESFORD ROAD
		STREET 2:		SUITE 301
		CITY:			WAYNE
		STATE:			PA
		ZIP:			19087

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Trinseo S.A.
		DATE OF NAME CHANGE:	20110429

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Bain Capital Everest (Luxco 2) S.a r.l.
		DATE OF NAME CHANGE:	20110426
</SEC-HEADER>
<DOCUMENT>
<TYPE>4/A
<SEQUENCE>1
<FILENAME>form4a-06272025_080629.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0508</schemaVersion>

    <documentType>4/A</documentType>

    <periodOfReport>2025-06-21</periodOfReport>

    <dateOfOriginalSubmission>2025-06-24</dateOfOriginalSubmission>

    <issuer>
        <issuerCik>0001519061</issuerCik>
        <issuerName>Trinseo PLC</issuerName>
        <issuerTradingSymbol>TSE</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001196701</rptOwnerCik>
            <rptOwnerName>COTE JEFFREY J</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O TRINSEO PLC</rptOwnerStreet1>
            <rptOwnerStreet2>440 EAST SWEDESFORD ROAD, SUITE 301</rptOwnerStreet2>
            <rptOwnerCity>WAYNE</rptOwnerCity>
            <rptOwnerState>PA</rptOwnerState>
            <rptOwnerZipCode>19087</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>true</isDirector>
            <isOfficer>false</isOfficer>
            <isTenPercentOwner>false</isTenPercentOwner>
            <isOther>false</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Ordinary Shares</value>
            </securityTitle>
            <transactionDate>
                <value>2025-06-21</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>F</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>10310</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>3.73</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>45699</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Ordinary Shares</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>170503</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                    <footnoteId id="F3"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Cote 2019 Irrevocable Indenture Trust</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">Shares withheld by the Company to pay taxes due following the vesting of previously granted restricted stock units.</footnote>
        <footnote id="F2">This amendment is being filed solely to correct the number of shares indirectly held by the reporting person.</footnote>
        <footnote id="F3">Represents shares held by an irrevocable indenture trust having a disinterested trustee for the benefit of the reporting person and children (the &quot;Cote 2019 Irrevocable Indenture Trust&quot;).</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Angelo Chaclas, Attorney-in-Fact</signatureName>
        <signatureDate>2025-06-27</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
