<SEC-DOCUMENT>0001596771-16-000145.txt : 20160808
<SEC-HEADER>0001596771-16-000145.hdr.sgml : 20160808
<ACCEPTANCE-DATETIME>20160808165641
ACCESSION NUMBER:		0001596771-16-000145
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20160804
FILED AS OF DATE:		20160808
DATE AS OF CHANGE:		20160808

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Gemphire Therapeutics Inc.
		CENTRAL INDEX KEY:			0001638287
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				472389984
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		43334 7 MILE ROAD
		STREET 2:		SUITE 1000
		CITY:			NORTHVILLE
		STATE:			MI
		ZIP:			48167
		BUSINESS PHONE:		248-980-6538

	MAIL ADDRESS:	
		STREET 1:		43334 7 MILE ROAD
		STREET 2:		SUITE 1000
		CITY:			NORTHVILLE
		STATE:			MI
		ZIP:			48167

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Sooch Mina
		CENTRAL INDEX KEY:			0001674006

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-37809
		FILM NUMBER:		161814931

	MAIL ADDRESS:	
		STREET 1:		43334 SEVEN MILE ROAD
		STREET 2:		SUITE 1000
		CITY:			NORTHVILLE
		STATE:			MI
		ZIP:			48167
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2016-08-04</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001638287</issuerCik>
        <issuerName>Gemphire Therapeutics Inc.</issuerName>
        <issuerTradingSymbol>GEMP</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001674006</rptOwnerCik>
            <rptOwnerName>Sooch Mina</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>43334 SEVEN MILE ROAD</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 1000</rptOwnerStreet2>
            <rptOwnerCity>NORTHVILLE</rptOwnerCity>
            <rptOwnerState>MI</rptOwnerState>
            <rptOwnerZipCode>48167</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>President &amp; CEO</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Employee Stock Option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>10</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2016-08-04</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>360000</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <value>2026-08-03</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>360000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>360000</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">360,000 of the shares underlying the option award vest immediately on the date of the grant, 120,000 shares underlying the option award are earned upon the initiation of the Company's first clinical trial and 120,000 shares underlying the option award are earned upon the initiation of the Company's second clinical trial.</footnote>
        <footnote id="F2">The option vests in 48 equal consecutive monthly increments, so that all of the shares will be vested on the fourth anniversary of the date of grant.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Stephanie Swan, by Power of Attorney</signatureName>
        <signatureDate>2016-08-08</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
