<SEC-DOCUMENT>0001104659-17-027040.txt : 20170427
<SEC-HEADER>0001104659-17-027040.hdr.sgml : 20170427
<ACCEPTANCE-DATETIME>20170427172702
ACCESSION NUMBER:		0001104659-17-027040
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20170425
FILED AS OF DATE:		20170427
DATE AS OF CHANGE:		20170427

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Trade Desk, Inc.
		CENTRAL INDEX KEY:			0001671933
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-COMPUTER PROGRAMMING, DATA PROCESSING, ETC. [7370]
		IRS NUMBER:				271887399
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		42 N. CHESTNUT STREET
		CITY:			VENTURA
		STATE:			CA
		ZIP:			93001
		BUSINESS PHONE:		(805) 585-3434

	MAIL ADDRESS:	
		STREET 1:		42 N. CHESTNUT STREET
		CITY:			VENTURA
		STATE:			CA
		ZIP:			93001

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Hadley Harbor Master Investors (Cayman) L.P.
		CENTRAL INDEX KEY:			0001641080
		STATE OF INCORPORATION:			E9
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-37879
		FILM NUMBER:		17790410

	BUSINESS ADDRESS:	
		STREET 1:		ELIAN FIDUCIARY SERVICES (CAYMAN) LTD
		STREET 2:		89 NEXUS WAY, CAMANA BAY
		CITY:			GRAND CAYMAN
		STATE:			E9
		ZIP:			KY1-9007
		BUSINESS PHONE:		617-790-7163

	MAIL ADDRESS:	
		STREET 1:		ELIAN FIDUCIARY SERVICES (CAYMAN) LTD
		STREET 2:		89 NEXUS WAY, CAMANA BAY
		CITY:			GRAND CAYMAN
		STATE:			E9
		ZIP:			KY1-9007
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>a4.xml
<DESCRIPTION>4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2017-04-25</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001671933</issuerCik>
        <issuerName>Trade Desk, Inc.</issuerName>
        <issuerTradingSymbol>TTD</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001641080</rptOwnerCik>
            <rptOwnerName>Hadley Harbor Master Investors (Cayman) L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O WELLINGTON MANAGEMENT COMPANY LLP</rptOwnerStreet1>
            <rptOwnerStreet2>280 CONGRESS STREET</rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02210</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2017-04-25</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>24416</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>36.3952</value>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1861958</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2017-04-26</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>61951</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>36.7194</value>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1800007</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $36.3652 to $36.4965, inclusive. The reporting person undertakes to provide to The Trade Desk, Inc., any security holder of The Trade Desk, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnote (1) to this Form 4.</footnote>
        <footnote id="F2">The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $36.71 to $36.7436, inclusive. The reporting person undertakes to provide to The Trade Desk, Inc., any security holder of The Trade Desk, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnote (2) to this Form 4.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Hadley Harbor Master Investors (Cayman) L.P. By: Wellington Alternative Investments LLC, Its General Partner By: /s/ Colin Sullivan, Title: Authorized Person</signatureName>
        <signatureDate>2017-04-27</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
