<SEC-DOCUMENT>0001968704-25-000002.txt : 20251020
<SEC-HEADER>0001968704-25-000002.hdr.sgml : 20251020
<ACCEPTANCE-DATETIME>20251020124825
ACCESSION NUMBER:		0001968704-25-000002
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20251017
FILED AS OF DATE:		20251020
DATE AS OF CHANGE:		20251020

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Meyers Karl L
		CENTRAL INDEX KEY:			0001968704
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-40718
		FILM NUMBER:		251403076

	MAIL ADDRESS:	
		STREET 1:		C/O SYLVAMO CORPORATION
		STREET 2:		6077 PRIMACY PARKWAY
		CITY:			MEMPHIS
		STATE:			TN
		ZIP:			38119

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Sylvamo Corp
		CENTRAL INDEX KEY:			0001856485
		STANDARD INDUSTRIAL CLASSIFICATION:	PAPER MILLS [2621]
		ORGANIZATION NAME:           	04 Manufacturing
		EIN:				862596371
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		6077 PRIMACY PARKWAY
		CITY:			MEMPHIS
		STATE:			TN
		ZIP:			38119
		BUSINESS PHONE:		901-519-8000

	MAIL ADDRESS:	
		STREET 1:		6077 PRIMACY PARKWAY
		CITY:			MEMPHIS
		STATE:			TN
		ZIP:			38119
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primarydocument.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0508</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2025-10-17</periodOfReport>

    <notSubjectToSection16>false</notSubjectToSection16>

    <issuer>
        <issuerCik>0001856485</issuerCik>
        <issuerName>Sylvamo Corp</issuerName>
        <issuerTradingSymbol>SLVM</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001968704</rptOwnerCik>
            <rptOwnerName>Meyers Karl L</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O SYLVAMO CORPORATION</rptOwnerStreet1>
            <rptOwnerStreet2>6077 PRIMACY PARKWAY</rptOwnerStreet2>
            <rptOwnerCity>MEMPHIS</rptOwnerCity>
            <rptOwnerState>TN</rptOwnerState>
            <rptOwnerZipCode>38119</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>true</isDirector>
            <isOfficer>false</isOfficer>
            <isTenPercentOwner>false</isTenPercentOwner>
            <isOther>false</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>false</aff10b5One>

    <nonDerivativeTable></nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Deferred Stock Units</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2025-10-17</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>false</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>156.7589</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>42.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F1"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>156.7589</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>722.5861</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Consists of deferred stock units (&quot;DSUs&quot;) granted to the reporting person under the Sylvamo Corporation Restricted Stock and Deferred Compensation Plan for Non-Employee Directors (the &quot;Plan&quot;) in connection with a dividend declared on shares of Sylvamo Corporation common stock. Each DSU is the economic equivalent of one share of Sylvamo Corporation common stock. Under the Plan, the DSUs settle according to the reporting person's election of either five (5) or ten (10) years upon the last day of the applicable Performance Year (as defined in the Plan), or if earlier, January of the next calendar year following the year in which the reporting person terminates service as a director. The number of DSUs has been rounded to 4 decimal points.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Maria St. John Daugherty, attorney in fact for Karl L. Meyers</signatureName>
        <signatureDate>2025-10-20</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
