-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
 Bv6XSQ7U926cD/iRrsxhhClC3HMsKTx6Tr2u1SYo6rGQjDWUmGXRuqFpATENDVmy
 GutlqIjB7zp1L2wMNnbXCA==

<SEC-DOCUMENT>0001095449-03-000058.txt : 20030619
<SEC-HEADER>0001095449-03-000058.hdr.sgml : 20030619
<ACCEPTANCE-DATETIME>20030618174816
ACCESSION NUMBER:		0001095449-03-000058
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20030617
FILED AS OF DATE:		20030619

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:		03749301

	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>

    <documentType>4</documentType>

    <periodOfReport>2003-06-17</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>  </rptOwnerStreet1>
            <rptOwnerStreet2>  </rptOwnerStreet2>
            <rptOwnerCity>  </rptOwnerCity>
            <rptOwnerState>  </rptOwnerState>
            <rptOwnerZipCode>  </rptOwnerZipCode>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeSecurity>
        <securityTitle>
            <value>Common Stock, $1.00 par value</value>
        </securityTitle>
        <transactionDate>
            <value>2003-06-17</value>
        </transactionDate>
        <transactionCoding>
            <transactionFormType>4</transactionFormType>
            <transactionCode>P</transactionCode>
            <equitySwapInvolved>0</equitySwapInvolved>
        </transactionCoding>
        <transactionTimeliness>
            <value></value>
        </transactionTimeliness>
        <transactionAmounts>
            <transactionShares>
                <value>1000</value>
            </transactionShares>
            <transactionValue>
                <value>2.83</value>
            </transactionValue>
            <transactionAcquiredDisposedCode>
                <value>A</value>
            </transactionAcquiredDisposedCode>
        </transactionAmounts>
        <postTransactionAmounts>
            <sharesOwnedFollowingTransaction>
                <value>477648</value>
            </sharesOwnedFollowingTransaction>
        </postTransactionAmounts>
        <ownershipNature>
            <directOrIndirectOwnership>
                <value>D</value>
            </directOrIndirectOwnership>
        </ownershipNature>
    </nonDerivativeSecurity>


    <ownerSignature>
        <signatureName>Mitchell J. Soboleski</signatureName>
        <signatureDate>2003-06-17</signatureDate>
    </ownerSignature>

</ownershipDocument>

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