<SEC-DOCUMENT>0001628280-25-039737.txt : 20250811
<SEC-HEADER>0001628280-25-039737.hdr.sgml : 20250811
<ACCEPTANCE-DATETIME>20250811210130
ACCESSION NUMBER:		0001628280-25-039737
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:			WELDON WILLIAM C
		CENTRAL INDEX KEY:			0001189019
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-42790
		FILM NUMBER:		251203699

	MAIL ADDRESS:	
		STREET 1:		100 ALBANY STREET
		STREET 2:		SUITE #200
		CITY:			NEW BRUNSWICK
		STATE:			NJ
		ZIP:			08901

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>
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        <issuerCik>0001464521</issuerCik>
        <issuerName>Heartflow, Inc.</issuerName>
        <issuerTradingSymbol>HTFL</issuerTradingSymbol>
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            <rptOwnerName>WELDON WILLIAM C</rptOwnerName>
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            <rptOwnerStreet2>331 E. EVELYN AVENUE</rptOwnerStreet2>
            <rptOwnerCity>MOUNTAIN  VIEW</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
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                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
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        <derivativeTransaction>
            <securityTitle>
                <value>Series F-1 Preferred Stock</value>
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                    <value>27704</value>
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                    <footnoteId id="F2"/>
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                    <value>D</value>
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    <footnotes>
        <footnote id="F1">Each share of Series D preferred stock automatically converted into approximately 0.6467 shares of Heartflow, Inc.'s (&quot;Heartflow&quot;) common stock immediately prior to the closing of Heartflow's initial public offering. These shares are reported in Table II above on an as-converted basis.</footnote>
        <footnote id="F2">Each share of Series F preferred stock and Series F-1 preferred stock automatically converted into approximately 0.3425 shares of Heartflow's common stock immediately prior to the closing of Heartflow's initial public offering. These shares are reported in Table II above on an as-converted basis.</footnote>
        <footnote id="F3">The option will vest in full on the earlier of Heartflow'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 William C. Weldon</signatureName>
        <signatureDate>2025-08-11</signatureDate>
    </ownerSignature>
</ownershipDocument>
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</SEC-DOCUMENT>
