<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0508</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2023-07-31</periodOfReport>

    <issuer>
        <issuerCik>0001428439</issuerCik>
        <issuerName>ROKU, INC</issuerName>
        <issuerTradingSymbol>ROKU</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001247487</rptOwnerCik>
            <rptOwnerName>KAY STEPHEN H</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O ROKU, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>1155 COLEMAN AVE.</rptOwnerStreet2>
            <rptOwnerCity>SAN JOSE</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>95110</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>SVP General Counsel, Secretary</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>1</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
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                <value>Class A Common Stock</value>
            </securityTitle>
            <transactionDate>
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            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>C</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>3216</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>2.94</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
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                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
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                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
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            </transactionCoding>
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                </transactionShares>
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                </transactionPricePerShare>
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                </transactionAcquiredDisposedCode>
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                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
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            </securityTitle>
            <transactionDate>
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            </transactionCoding>
            <transactionAmounts>
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                </transactionShares>
                <transactionPricePerShare>
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                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
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                </transactionAcquiredDisposedCode>
            </transactionAmounts>
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                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
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                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
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            </securityTitle>
            <transactionDate>
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            </transactionDate>
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                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
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                    <footnoteId id="F1"/>
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                <transactionPricePerShare>
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                <transactionAcquiredDisposedCode>
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                </sharesOwnedFollowingTransaction>
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                </directOrIndirectOwnership>
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        </nonDerivativeTransaction>
    </nonDerivativeTable>

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            <transactionDate>
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            <exerciseDate>
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            <expirationDate>
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                <underlyingSecurityTitle>
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                </underlyingSecurityTitle>
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                </underlyingSecurityShares>
            </underlyingSecurity>
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                </transactionShares>
                <transactionPricePerShare>
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                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
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            <exerciseDate>
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            <expirationDate>
                <value>2024-01-23</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
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                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>3216</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
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                <sharesOwnedFollowingTransaction>
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                </sharesOwnedFollowingTransaction>
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                </directOrIndirectOwnership>
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        </derivativeTransaction>
        <derivativeTransaction>
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                </transactionShares>
                <transactionPricePerShare>
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            <expirationDate>
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                </underlyingSecurityTitle>
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                </underlyingSecurityShares>
            </underlyingSecurity>
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        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
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            </securityTitle>
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            </conversionOrExercisePrice>
            <transactionDate>
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            <expirationDate>
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                </underlyingSecurityTitle>
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                </underlyingSecurityShares>
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            <securityTitle>
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                <footnoteId id="F3"/>
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            <transactionDate>
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                <transactionPricePerShare>
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            <expirationDate>
                <footnoteId id="F3"/>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Class A Common Stock</value>
                </underlyingSecurityTitle>
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                    <value>40</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
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                <sharesOwnedFollowingTransaction>
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                <directOrIndirectOwnership>
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            <securityTitle>
                <value>Employee Stock Option (Right to Buy)</value>
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            </conversionOrExercisePrice>
            <transactionDate>
                <value>2023-07-31</value>
            </transactionDate>
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                <transactionCode>M</transactionCode>
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                <transactionShares>
                    <value>2436</value>
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                <transactionPricePerShare>
                    <value>5.64</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
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            <exerciseDate>
                <footnoteId id="F2"/>
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            <expirationDate>
                <value>2025-03-22</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Class B Common Stock</value>
                </underlyingSecurityTitle>
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                    <value>2436</value>
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        <derivativeTransaction>
            <securityTitle>
                <value>Class B Common Stock</value>
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            <conversionOrExercisePrice>
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            </conversionOrExercisePrice>
            <transactionDate>
                <value>2023-07-31</value>
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                <transactionCode>M</transactionCode>
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                <transactionPricePerShare>
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            <underlyingSecurity>
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                </underlyingSecurityTitle>
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                <directOrIndirectOwnership>
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        </derivativeTransaction>
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            <securityTitle>
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                <footnoteId id="F3"/>
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                </underlyingSecurityTitle>
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    </derivativeTable>

    <footnotes>
        <footnote id="F1">Shares sold pursuant to Mr. Kay's 10b5-1 plan.</footnote>
        <footnote id="F2">This stock option is fully vested.</footnote>
        <footnote id="F3">Each share of Class B Common Stock is convertible at any time at the option of the Reporting Person into one share of Class A Common Stock and has no expiration date. Shares of Class B Common Stock will convert automatically into shares of Class A Common Stock upon the earlier of: (i) any transfer except for certain &quot;Permitted Transfers&quot; as defined in the Issuer's restated certificate of incorporation, (ii) the first &quot;Trading Day&quot;, as defined in the Issuer's restated certificate of incorporation, falling on or after the date on which the shares of Class B Common Stock represent less than 10% of the aggregate number of outstanding shares of Class A Common Stock and Class B Common Stock or (iii) the vote of the holders of Class B Common Stock representing at least 66-2/3% of the shares of Class B Common Stock.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/Renee Strandness, attorney-in-fact</signatureName>
        <signatureDate>2023-08-02</signatureDate>
    </ownerSignature>
</ownershipDocument>
