<SEC-DOCUMENT>0001628280-18-015305.txt : 20181219
<SEC-HEADER>0001628280-18-015305.hdr.sgml : 20181219
<ACCEPTANCE-DATETIME>20181219174012
ACCESSION NUMBER:		0001628280-18-015305
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20181218
FILED AS OF DATE:		20181219
DATE AS OF CHANGE:		20181219

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			JohnBull Kathryn M.
		CENTRAL INDEX KEY:			0001553121

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-18492
		FILM NUMBER:		181244228

	MAIL ADDRESS:	
		STREET 1:		1776 PEACHTREE STREET, NW
		STREET 2:		SUITE 300S
		CITY:			ATLANTA
		STATE:			GA
		ZIP:			30309

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			DLH Holdings Corp.
		CENTRAL INDEX KEY:			0000785557
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-HELP SUPPLY SERVICES [7363]
		IRS NUMBER:				221899798
		STATE OF INCORPORATION:			NJ
		FISCAL YEAR END:			0930

	BUSINESS ADDRESS:	
		STREET 1:		3565 PIEDMONT ROAD, NE
		STREET 2:		BUILDING 3, SUITE 700
		CITY:			ATLANTA
		STATE:			GA
		ZIP:			30305
		BUSINESS PHONE:		8669521647

	MAIL ADDRESS:	
		STREET 1:		3565 PIEDMONT ROAD, NE
		STREET 2:		BUILDING 3, SUITE 700
		CITY:			ATLANTA
		STATE:			GA
		ZIP:			30305

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	TEAMSTAFF INC
		DATE OF NAME CHANGE:	19990216

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	DIGITAL SOLUTIONS INC
		DATE OF NAME CHANGE:	19920703
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>wf-form4_154525919549204.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2018-12-18</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000785557</issuerCik>
        <issuerName>DLH Holdings Corp.</issuerName>
        <issuerTradingSymbol>DLHC</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001553121</rptOwnerCik>
            <rptOwnerName>JohnBull Kathryn M.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>DLH HOLDINGS CORP</rptOwnerStreet1>
            <rptOwnerStreet2>3565 PIEDMONT ROAD, NE BLDG. 3-700</rptOwnerStreet2>
            <rptOwnerCity>ATLANTA</rptOwnerCity>
            <rptOwnerState>GA</rptOwnerState>
            <rptOwnerZipCode>30305</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chief Financial Officer</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2018-12-18</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>10000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>1.34</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>112654</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Employee Stock Options</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>1.34</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2018-12-18</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>10000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>1.34</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2012-06-25</value>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <value>2022-06-25</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>10000.0</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>223000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">(1) The option, initially representing a right to purchase a total of 250,000 shares, became exercisable for 50,000 shares on June 25, 2012. Of the remaining shares subject to this option, 66,666 shares remain subject to additional vesting requirements.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Kathryn M. JohnBull</signatureName>
        <signatureDate>2018-12-19</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
