<SEC-DOCUMENT>0001181431-14-023666.txt : 20140624
<SEC-HEADER>0001181431-14-023666.hdr.sgml : 20140624
<ACCEPTANCE-DATETIME>20140611175155
ACCESSION NUMBER:		0001181431-14-023666
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20140611
FILED AS OF DATE:		20140611
DATE AS OF CHANGE:		20140611

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Trinseo S.A.
		CENTRAL INDEX KEY:			0001519061
		STANDARD INDUSTRIAL CLASSIFICATION:	PLASTICS, MATERIALS, SYNTH RESINS & NONVULCAN ELASTOMERS [2821]
		IRS NUMBER:				000000000

	BUSINESS ADDRESS:	
		STREET 1:		1000 CHESTERBROOK BOULEVARD
		STREET 2:		SUITE 3000
		CITY:			BERWYN
		STATE:			PA
		ZIP:			19312
		BUSINESS PHONE:		610-240-3200

	MAIL ADDRESS:	
		STREET 1:		1000 CHESTERBROOK BOULEVARD
		STREET 2:		SUITE 3000
		CITY:			BERWYN
		STATE:			PA
		ZIP:			19312

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Bain Capital Everest (Luxco 2) S.a r.l.
		DATE OF NAME CHANGE:	20110426

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Vasseur Aurelien
		CENTRAL INDEX KEY:			0001607005

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-36473
		FILM NUMBER:		14905546

	MAIL ADDRESS:	
		STREET 1:		BAIN CAPITAL LUXEMBOURG S.A.R.L.
		STREET 2:		4 RUE LOU HEMMER
		CITY:			LUXEMBOURG
		STATE:			N4
		ZIP:			L-1748
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>rrd411393.xml
<DESCRIPTION>FORM 3
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2014-06-11</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001519061</issuerCik>
        <issuerName>Trinseo S.A.</issuerName>
        <issuerTradingSymbol>TSE</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001607005</rptOwnerCik>
            <rptOwnerName>Vasseur Aurelien</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O BAIN CAPITAL LUXEMBOURG S.A R.L.</rptOwnerStreet1>
            <rptOwnerStreet2>4 RUE LOU HEMMER, L-1748</rptOwnerStreet2>
            <rptOwnerCity>LUXEMBOURG</rptOwnerCity>
            <rptOwnerState>N4</rptOwnerState>
            <rptOwnerZipCode></rptOwnerZipCode>
            <rptOwnerStateDescription>LUXEMBOURG</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Ordinary Shares</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>37269567</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Represents ordinary shares of Trinseo S.A. held by Bain Capital Everest Manager Holding SCA (&quot;BCEM Holding&quot;) whose general partner is Bain Capital Everest Manager S.a r.l. (&quot;BCEM&quot;). All of the outstanding share capital of BCEM is held by Bain Capital Europe Fund III, L.P. (&quot;Europe Fund III&quot;) and, in that capacity, Europe Fund III has the power to appoint the managers of BCEM.  Bain Capital Investors, LLC (&quot;BCI&quot;) is the general partner of Bain Capital Partners Europe III, L.P., which is the general partner of Europe Fund III.  By virtue of these relationships, BCI may be deemed to share voting and dispositive power with respect to the shares held by BCEM Holding.</footnote>
        <footnote id="F2">(Continued from Footnote 1) In addition to being the general partner of Bain Capital Partners Europe III, L.P., which is the general partner of Europe Fund III, BCI is the general partner of Bain Capital Partners X, L.P., which is the general partner of Bain Capital Fund X, L.P.  BCI is also the managing general partner of BCIP Associates IV, L.P., BCIP Associates IV-B, L.P., BCIP Trust Associates IV, L.P. and BCIP Trust Associates IV-B, L.P.   Mr. Vasseur is a corporate manager of BCI. By virtue of the relationships described in this footnote, Mr. Vasseur may be deemed to share voting and dispositive power with respect to the shares of Trinseo S.A. held by BCEM Holding. Mr. Vasseur disclaims beneficial ownership of such securities except to the extent of his pecuniary interest therein.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/S/: Aurelien Vasseur</signatureName>
        <signatureDate>2014-06-11</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
