<SEC-DOCUMENT>0001179110-20-004270.txt : 20200331
<SEC-HEADER>0001179110-20-004270.hdr.sgml : 20200331
<ACCEPTANCE-DATETIME>20200331202332
ACCESSION NUMBER:		0001179110-20-004270
CONFORMED SUBMISSION TYPE:	4/A
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20180829
FILED AS OF DATE:		20200331
DATE AS OF CHANGE:		20200331

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Thor James E
		CENTRAL INDEX KEY:			0001300922

	FILING VALUES:
		FORM TYPE:		4/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-20797
		FILM NUMBER:		20763441

	MAIL ADDRESS:	
		STREET 1:		C/O RUSH ENTERPRISES, INC.
		STREET 2:		P. O. BOX 34630
		CITY:			SAN ANTONIO
		STATE:			TX
		ZIP:			78265

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			RUSH ENTERPRISES INC \TX\
		CENTRAL INDEX KEY:			0001012019
		STANDARD INDUSTRIAL CLASSIFICATION:	RETAIL-AUTO DEALERS & GASOLINE STATIONS [5500]
		IRS NUMBER:				741733016
		STATE OF INCORPORATION:			TX
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		555 IH 35 SOUTH
		CITY:			NEW BRAUNFELS
		STATE:			TX
		ZIP:			78130
		BUSINESS PHONE:		8306265200

	MAIL ADDRESS:	
		STREET 1:		555 IH 35 SOUTH
		CITY:			NEW BRAUNFELS
		STATE:			TX
		ZIP:			78130
</SEC-HEADER>
<DOCUMENT>
<TYPE>4/A
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>FORM 4/A -
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4/A</documentType>

    <periodOfReport>2018-08-29</periodOfReport>

    <dateOfOriginalSubmission>2020-03-17</dateOfOriginalSubmission>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001012019</issuerCik>
        <issuerName>RUSH ENTERPRISES INC \TX\</issuerName>
        <issuerTradingSymbol>RUSH</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001300922</rptOwnerCik>
            <rptOwnerName>Thor James E</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>555 IH 35 SOUTH, SUITE 500</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW BRAUNFELS</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>78130</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Senior Vice President</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>22992.064</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Class B Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>76261.55</value>
                    <footnoteId id="F3"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">This Form 4/A is being filed to amend the Form 4 filed by the reporting person on March 17, 2020, to correct an inadvertent administrative error. Although footnote 3 of the original filing disclosed the correct amount of Class A Common Stock acquired by the reporting person pursuant to the Rush Enterprises, Inc. Employee Stock Purchase Plan, these shares were inadvertently left out of the total reported in Table 1, Column 5 of Class A Common Stock.</footnote>
        <footnote id="F2">Includes certain shares included in the Company's deferred compensation plan. Also includes shares acquired via dividend repurchases and reported on Form 4 on March 19, 2020.</footnote>
        <footnote id="F3">Includes unvested restricted stock (RSAs) and certain shares and unvested restricted stock units included in the Company's deferred compensation plan. Also includes shares acquired via dividend repurchases and reported on Form 4 on March 19, 2020.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Steven L. Keller, Attorney in Fact for James E. Thor</signatureName>
        <signatureDate>2020-03-31</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
