<SEC-DOCUMENT>0001209191-20-037031.txt : 20200616
<SEC-HEADER>0001209191-20-037031.hdr.sgml : 20200616
<ACCEPTANCE-DATETIME>20200616174229
ACCESSION NUMBER:		0001209191-20-037031
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20200612
FILED AS OF DATE:		20200616
DATE AS OF CHANGE:		20200616

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Frazier Life Sciences IX, L.P.
		CENTRAL INDEX KEY:			0001720320
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-39094
		FILM NUMBER:		20967445

	BUSINESS ADDRESS:	
		STREET 1:		601 UNION STREET
		STREET 2:		SUITE 3200
		CITY:			SEATTLE
		STATE:			WA
		ZIP:			98101
		BUSINESS PHONE:		206-254-7200

	MAIL ADDRESS:	
		STREET 1:		601 UNION STREET
		STREET 2:		SUITE 3200
		CITY:			SEATTLE
		STATE:			WA
		ZIP:			98101

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			FHMLS IX, L.P.
		CENTRAL INDEX KEY:			0001782789
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-39094
		FILM NUMBER:		20967446

	BUSINESS ADDRESS:	
		STREET 1:		601 UNION STREET
		STREET 2:		SUITE 3200
		CITY:			SEATTLE
		STATE:			WA
		ZIP:			98101
		BUSINESS PHONE:		206-254-7200

	MAIL ADDRESS:	
		STREET 1:		601 UNION STREET
		STREET 2:		SUITE 3200
		CITY:			SEATTLE
		STATE:			WA
		ZIP:			98101

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			FHMLS IX, L.L.C.
		CENTRAL INDEX KEY:			0001782791
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-39094
		FILM NUMBER:		20967447

	BUSINESS ADDRESS:	
		STREET 1:		601 UNION STREET
		STREET 2:		SUITE 3200
		CITY:			SEATTLE
		STATE:			WA
		ZIP:			98101
		BUSINESS PHONE:		206-254-7200

	MAIL ADDRESS:	
		STREET 1:		601 UNION STREET
		STREET 2:		SUITE 3200
		CITY:			SEATTLE
		STATE:			WA
		ZIP:			98101

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Topper James N
		CENTRAL INDEX KEY:			0001341382

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-39094
		FILM NUMBER:		20967448

	MAIL ADDRESS:	
		STREET 1:		550 HAMILTON AVENUE, SUITE 100
		CITY:			PALO ALTO
		STATE:			CA
		ZIP:			94301

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Heron Patrick J
		CENTRAL INDEX KEY:			0001365617

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-39094
		FILM NUMBER:		20967449

	MAIL ADDRESS:	
		STREET 1:		550 HAMILTON AVE., SUITE 100
		CITY:			PALO ALTO
		STATE:			CA
		ZIP:			94301

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Phathom Pharmaceuticals, Inc.
		CENTRAL INDEX KEY:			0001783183
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				824151574
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		100 CAMPUS DRIVE,
		STREET 2:		SUITE 102
		CITY:			FLORHAM PARK
		STATE:			NJ
		ZIP:			07932
		BUSINESS PHONE:		(877) 742-8466

	MAIL ADDRESS:	
		STREET 1:		100 CAMPUS DRIVE,
		STREET 2:		SUITE 102
		CITY:			FLORHAM PARK
		STATE:			NJ
		ZIP:			07932
</SEC-HEADER>
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<TYPE>4
<SEQUENCE>1
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<DESCRIPTION>FORM 4 SUBMISSION
<TEXT>
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<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2020-06-12</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001783183</issuerCik>
        <issuerName>Phathom Pharmaceuticals, Inc.</issuerName>
        <issuerTradingSymbol>PHAT</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001720320</rptOwnerCik>
            <rptOwnerName>Frazier Life Sciences IX, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O FRAZIER HEALTHCARE PARTNERS</rptOwnerStreet1>
            <rptOwnerStreet2>601 UNION STREET, SUITE 3200</rptOwnerStreet2>
            <rptOwnerCity>SEATTLE</rptOwnerCity>
            <rptOwnerState>WA</rptOwnerState>
            <rptOwnerZipCode>98101</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
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            <isOther>0</isOther>
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    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001782789</rptOwnerCik>
            <rptOwnerName>FHMLS IX, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O FRAZIER HEALTHCARE PARTNERS</rptOwnerStreet1>
            <rptOwnerStreet2>601 UNION STREET, SUITE 3200</rptOwnerStreet2>
            <rptOwnerCity>SEATTLE</rptOwnerCity>
            <rptOwnerState>WA</rptOwnerState>
            <rptOwnerZipCode>98101</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
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        <reportingOwnerRelationship>
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            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
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    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001782791</rptOwnerCik>
            <rptOwnerName>FHMLS IX, L.L.C.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O FRAZIER HEALTHCARE PARTNERS</rptOwnerStreet1>
            <rptOwnerStreet2>601 UNION STREET, SUITE 3200</rptOwnerStreet2>
            <rptOwnerCity>SEATTLE</rptOwnerCity>
            <rptOwnerState>WA</rptOwnerState>
            <rptOwnerZipCode>98101</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
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    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001341382</rptOwnerCik>
            <rptOwnerName>Topper James N</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O FRAZIER HEALTHCARE PARTNERS</rptOwnerStreet1>
            <rptOwnerStreet2>601 UNION STREET, SUITE 3200</rptOwnerStreet2>
            <rptOwnerCity>SEATTLE</rptOwnerCity>
            <rptOwnerState>WA</rptOwnerState>
            <rptOwnerZipCode>98101</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001365617</rptOwnerCik>
            <rptOwnerName>Heron Patrick J</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O FRAZIER HEALTHCARE PARTNERS</rptOwnerStreet1>
            <rptOwnerStreet2>601 UNION STREET, SUITE 3200</rptOwnerStreet2>
            <rptOwnerCity>SEATTLE</rptOwnerCity>
            <rptOwnerState>WA</rptOwnerState>
            <rptOwnerZipCode>98101</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2020-06-12</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>1456854</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>5827415</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F2"/>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1</value>
                    <footnoteId id="F3"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnote</value>
                    <footnoteId id="F4"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>12596</value>
                    <footnoteId id="F3"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnote</value>
                    <footnoteId id="F5"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>3912</value>
                    <footnoteId id="F3"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnote</value>
                    <footnoteId id="F6"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>14937</value>
                    <footnoteId id="F3"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnote</value>
                    <footnoteId id="F7"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Represents a pro rata distribution in-kind by Frazier Life Sciences IX, L.P. (&quot;FLS IX&quot;) to its limited partners for no consideration.</footnote>
        <footnote id="F2">Represents shares held of record by FLS IX. The general partner of FLS IX is FHMLS IX, L.P., and the general partner of FHMLS IX, L.P. is FHMLS IX, L.L.C. James Topper and Patrick Heron are the sole managing members of FHMLS IX, L.L.C. and share voting and investment power of the securities held by FLS IX. Dr. Topper and Mr. Heron disclaim beneficial ownership of such securities except to the extent of their pecuniary interest therein.</footnote>
        <footnote id="F3">Reflects shares of Common Stock received in the distribution in-kind described herein.</footnote>
        <footnote id="F4">Represents shares held of record by FHMLS IX, L.L.C. James Topper and Patrick Heron are the sole managing members of FHMLS IX, L.L.C. and share voting and investment power of the securities held by FLS IX. Dr. Topper and Mr. Heron disclaim beneficial ownership of such securities except to the extent of their pecuniary interest therein.  These shares were previously held through FLS IX.</footnote>
        <footnote id="F5">Represents shares held directly by Dr. Topper.  These shares were previously held through FLS IX.</footnote>
        <footnote id="F6">Represents shares held of record by Topper Group III LLC.  Dr. Topper is a manager of Topper Group III LLC and has voting and investment power of the securities held by Topper Group III LLC.  These shares were previously held through FLS IX.</footnote>
        <footnote id="F7">Represents shares held by The Heron Living Trust 11/30/2004.  Mr. Heron is the co-trustee of The Heron Living Trust 11/30/2004 and has voting and investment power of the securities held by The Heron Living Trust 11/30/2004.  These shares were previously held through FLS IX.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Frazier Life Sciences IX, L.P., By: FHMLS IX, L.P., its general partner, By: FHMLS IX, L.L.C., its general, partner, By: /s/ Steve R. Bailey, Chief Financial Officer</signatureName>
        <signatureDate>2020-06-16</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>FHMLS IX, L.P., By: FHMLS IX, L.L.C., its general partner, By: /s/ Steve R. Bailey, Chief Financial Officer</signatureName>
        <signatureDate>2020-06-16</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>FHMLS IX, L.L.C., By: /s/ Steve R. Bailey, Chief Financial Officer</signatureName>
        <signatureDate>2020-06-16</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Steve R. Bailey, Attorney-in-Fact for James Topper</signatureName>
        <signatureDate>2020-06-16</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Steve R. Bailey, Attorney-in-Fact for Patrick Heron</signatureName>
        <signatureDate>2020-06-16</signatureDate>
    </ownerSignature>
</ownershipDocument>
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</DOCUMENT>
</SEC-DOCUMENT>
