<SEC-DOCUMENT>0001140361-15-017713.txt : 20150505
<SEC-HEADER>0001140361-15-017713.hdr.sgml : 20150505
<ACCEPTANCE-DATETIME>20150505164542
ACCESSION NUMBER:		0001140361-15-017713
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20150504
FILED AS OF DATE:		20150505
DATE AS OF CHANGE:		20150505

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			GENERAC HOLDINGS INC.
		CENTRAL INDEX KEY:			0001474735
		STANDARD INDUSTRIAL CLASSIFICATION:	MOTORS & GENERATORS [3621]
		IRS NUMBER:				205654756
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		S45 W29290 HIGHWAY 59
		CITY:			WAUKESHA
		STATE:			WI
		ZIP:			53187
		BUSINESS PHONE:		888 436-3722

	MAIL ADDRESS:	
		STREET 1:		S45 W29290 HIGHWAY 59
		CITY:			WAUKESHA
		STATE:			WI
		ZIP:			53187

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			WALSH TIMOTHY J.
		CENTRAL INDEX KEY:			0001108220

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-34627
		FILM NUMBER:		15833637

	MAIL ADDRESS:	
		STREET 1:		JP MORGAN PARTNERS, LLC
		STREET 2:		1221 AVENUE OF THE AMERICAS-40TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10020

	FORMER NAME:	
		FORMER CONFORMED NAME:	WALSH TIMOTHY
		DATE OF NAME CHANGE:	20000301
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc1.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2015-05-04</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001474735</issuerCik>
        <issuerName>GENERAC HOLDINGS INC.</issuerName>
        <issuerTradingSymbol>GNRC</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001108220</rptOwnerCik>
            <rptOwnerName>WALSH TIMOTHY J.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O CCMP CAPITAL ADVISORS, LLC</rptOwnerStreet1>
            <rptOwnerStreet2>245 PARK AVENUE</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10167</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock, par value $0.01 per share</value>
            </securityTitle>
            <transactionDate>
                <value>2015-05-04</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>1894</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>39.61</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>33839</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">Of the 33,839 shares reported, Mr. Walsh directly beneficially owns 25,000 shares.  Under the terms of the contractual arrangements among CCMP Capital Investors II, L.P., CCMP Capital Investors (Cayman) II, L.P., CCMP Capital Associates and CCMP Capital, LLC (collectively, the &quot;CCMP Fund Entities&quot;), Mr. Walsh is deemed to hold 8,839 shares for the benefit of the CCMP Fund Entities and must vote or dispose of such shares upon the direction of CCMP Capital. CCMP Capital is, therefore, deemed to indirectly beneficially own such 8,839 shares. Mr. Walsh disclaims beneficial ownership of these 8,839 shares to the extent it exceeds his pecuniary interest therein and the inclusion of the shares in this report shall not be deemed to be an admission of beneficial ownership of the reported shares for the purposes of Section 16 or otherwise.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Richard G. Jansen, Attorney-in-fact</signatureName>
        <signatureDate>2015-05-05</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
