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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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 gBtAozKJRyL0JenhVkAYvw==

<SEC-DOCUMENT>0001095449-04-000079.txt : 20040506
<SEC-HEADER>0001095449-04-000079.hdr.sgml : 20040506
<ACCEPTANCE-DATETIME>20040506192242
ACCESSION NUMBER:		0001095449-04-000079
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20040127
FILED AS OF DATE:		20040506

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MAXCO INC
		CENTRAL INDEX KEY:			0000078966
		STANDARD INDUSTRIAL CLASSIFICATION:	WHOLESALE-MISCELLANEOUS NONDURABLE GOODS [5190]
		IRS NUMBER:				381792842
		STATE OF INCORPORATION:			MI
		FISCAL YEAR END:			0331

	BUSINESS ADDRESS:	
		STREET 1:		1118 CENTENNIAL WAY
		CITY:			LANSING
		STATE:			MI
		ZIP:			48917
		BUSINESS PHONE:		5173213130

	MAIL ADDRESS:	
		STREET 1:		PO BOX 80737
		CITY:			LANSING
		STATE:			MI
		ZIP:			489080737

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	PLANET CORP
		DATE OF NAME CHANGE:	19780802

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MICHIGAN PLANET CORP
		DATE OF NAME CHANGE:	19600201

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			ROI PARTNERS L P
		CENTRAL INDEX KEY:			0000882871

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-02762
		FILM NUMBER:		04786529

	BUSINESS ADDRESS:	
		STREET 1:		300 DRAKES LANDING ROAD
		STREET 2:		SUITE 175
		CITY:			GREENBRAE
		STATE:			CA
		ZIP:			94904
		BUSINESS PHONE:		4154648023

	MAIL ADDRESS:	
		STREET 1:		300 DRAKES LANDING ROAD
		STREET 2:		SUITE 175
		CITY:			GREENBRAE
		STATE:			CA
		ZIP:			94904
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2004-01-27</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000078966</issuerCik>
        <issuerName>MAXCO INC</issuerName>
        <issuerTradingSymbol>MAXC</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000882871</rptOwnerCik>
            <rptOwnerName>ROI PARTNERS L P</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>300 DRAKES LANDING ROAD</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 175</rptOwnerStreet2>
            <rptOwnerCity>GREENBRAE</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94904</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, $1.00 par value</value>
            </securityTitle>
            <transactionDate>
                <value>2004-01-27</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>1500</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>2.47</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>490748</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <ownerSignature>
        <signatureName>Mitchell J. Soboleski</signatureName>
        <signatureDate>2004-05-05</signatureDate>
    </ownerSignature>
</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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