<SEC-DOCUMENT>0000899243-19-029126.txt : 20191213
<SEC-HEADER>0000899243-19-029126.hdr.sgml : 20191213
<ACCEPTANCE-DATETIME>20191213134132
ACCESSION NUMBER:		0000899243-19-029126
CONFORMED SUBMISSION TYPE:	4/A
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20180611
FILED AS OF DATE:		20191213
DATE AS OF CHANGE:		20191213

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			CRAVES FRED B
		CENTRAL INDEX KEY:			0001014095

	FILING VALUES:
		FORM TYPE:		4/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-33277
		FILM NUMBER:		191284191

	MAIL ADDRESS:	
		STREET 1:		750 BATTERY ST
		STREET 2:		STE 600
		CITY:			SAN FRANCISCO
		STATE:			CA
		ZIP:			94111

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MADRIGAL PHARMACEUTICALS, INC.
		CENTRAL INDEX KEY:			0001157601
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		200 BARR HARBOR DRIVE, SUITE 400
		CITY:			WEST CONSHOHOCKEN
		STATE:			PA
		ZIP:			19428
		BUSINESS PHONE:		404-380-9263

	MAIL ADDRESS:	
		STREET 1:		200 BARR HARBOR DRIVE, SUITE 400
		CITY:			WEST CONSHOHOCKEN
		STATE:			PA
		ZIP:			19428

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	SYNTA PHARMACEUTICALS CORP
		DATE OF NAME CHANGE:	20010815
</SEC-HEADER>
<DOCUMENT>
<TYPE>4/A
<SEQUENCE>1
<FILENAME>doc4a.xml
<DESCRIPTION>FORM 4/A SUBMISSION
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4/A</documentType>

    <periodOfReport>2018-06-11</periodOfReport>

    <dateOfOriginalSubmission>2018-06-12</dateOfOriginalSubmission>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001157601</issuerCik>
        <issuerName>MADRIGAL PHARMACEUTICALS, INC.</issuerName>
        <issuerTradingSymbol>MDGL</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001014095</rptOwnerCik>
            <rptOwnerName>CRAVES FRED B</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O BAY CITY CAPITAL LLC</rptOwnerStreet1>
            <rptOwnerStreet2>750 BATTERY STREET, SUITE 400</rptOwnerStreet2>
            <rptOwnerCity>SAN FRANCISCO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94111</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2018-06-11</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>5908</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>287.46</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                    <footnoteId id="F1"/>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>113472</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">On June 12, 2018, the reporting person filed a Form 4 which inadvertently reported a transaction as an acquisition of common stock by including the &quot;A&quot; notation in Box 4 of Table I. In fact, as reported in this amendment, the transaction should have been reported with a &quot;D&quot; in Box 4 of Table I because the transaction in question was a disposition of common stock.</footnote>
        <footnote id="F2">Bay City Capital LLC, a Delaware limited liability company (&quot;BCC&quot;), Bay City Capital Management IV LLC, a Delaware limited liability company (&quot;Management IV&quot;), Bay City Capital Fund IV, L.P., a Delaware limited partnership (&quot;Fund IV&quot;), and Bay City Capital Fund IV Co-Investment Fund, L.P., a Delaware limited partnership (&quot;Co-Investment IV&quot;) are deemed to be a &quot;group&quot; for the purposes of Section 13(d) under the Securities Exchange Act of 1934. Management IV is the general partner of Fund IV and Co-Investment IV and has sole voting and dispositive power with respect to the securities held by Fund IV and Co-Investment IV. BCC, the manager of Management IV, is also an advisor to Fund IV and Co-Investment IV and has sole voting and dispositive power with respect to the securities held by Fund IV and Co-Investment IV.</footnote>
        <footnote id="F3">These securities are held by Co-Investment IV. Dr. Craves disclaims beneficial ownership of these securities held by Co-Investment IV, and this report shall not be deemed an admission that the reporting person is the beneficial owner of such shares, except to the extent of his pecuniary interest, if any, in the securities by virtue of the limited liability company interests he owns in BCC.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Fred B. Craves</signatureName>
        <signatureDate>2019-12-13</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
