<SEC-DOCUMENT>0001628280-25-039738.txt : 20250811
<SEC-HEADER>0001628280-25-039738.hdr.sgml : 20250811
<ACCEPTANCE-DATETIME>20250811210137
ACCESSION NUMBER:		0001628280-25-039738
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20250807
FILED AS OF DATE:		20250811
DATE AS OF CHANGE:		20250811

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Cullivan Julie A
		CENTRAL INDEX KEY:			0001713207
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-42790
		FILM NUMBER:		251203700

	MAIL ADDRESS:	
		STREET 1:		17800 N 85TH ST
		CITY:			SCOTTSDALE
		STATE:			AZ
		ZIP:			85255

	FORMER NAME:	
		FORMER CONFORMED NAME:	Cullivan Joyce A
		DATE OF NAME CHANGE:	20170727

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Heartflow, Inc.
		CENTRAL INDEX KEY:			0001464521
		STANDARD INDUSTRIAL CLASSIFICATION:	SURGICAL & MEDICAL INSTRUMENTS & APPARATUS [3841]
		ORGANIZATION NAME:           	08 Industrial Applications and Services
		EIN:				260506743
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0811

	BUSINESS ADDRESS:	
		STREET 1:		331 E EVELYN AVENUE
		CITY:			MOUNTAIN VIEW
		STATE:			CA
		ZIP:			94041
		BUSINESS PHONE:		650-241-1221

	MAIL ADDRESS:	
		STREET 1:		331 E EVELYN AVENUE
		CITY:			MOUNTAIN VIEW
		STATE:			CA
		ZIP:			94041

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Cardiovascular Simulation, Inc.
		DATE OF NAME CHANGE:	20090519
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>wk-form4_1754960493.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0508</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2025-08-07</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001464521</issuerCik>
        <issuerName>Heartflow, Inc.</issuerName>
        <issuerTradingSymbol>HTFL</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001713207</rptOwnerCik>
            <rptOwnerName>Cullivan Julie A</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O HEARTFLOW, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>331 E. EVELYN AVENUE</rptOwnerStreet2>
            <rptOwnerCity>MOUNTAIN  VIEW</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94041</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable></nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Stock Option</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>19</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2025-08-07</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>23710</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <value>2035-08-07</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>23710</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>23710</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The option will vest in full on the earlier of Heartflow, Inc.'s annual meeting of shareholders in 2026 and the first anniversary of the grant date, subject to continued service through such date.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Angela Ahmad, Attorney-in-Fact for Julie A. Cullivan</signatureName>
        <signatureDate>2025-08-11</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
