-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 Ir61sNIZFlt4SKThyu9W08ovy2FySH5OQOGnsMfiorre3HgnBp0RMvawCyPTppOK
 02domMLVFFzAYLXChUBlRQ==

<SEC-DOCUMENT>0001005477-03-002914.txt : 20030801
<SEC-HEADER>0001005477-03-002914.hdr.sgml : 20030801
<ACCEPTANCE-DATETIME>20030801101923
ACCESSION NUMBER:		0001005477-03-002914
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20030729
FILED AS OF DATE:		20030801

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			NEMATRON CORP
		CENTRAL INDEX KEY:			0000892832
		STANDARD INDUSTRIAL CLASSIFICATION:	ELECTRONIC COMPUTERS [3571]
		IRS NUMBER:				382483796
		STATE OF INCORPORATION:			MI
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		5840 INTEFACE DRIVE
		CITY:			ANN ARBOR
		STATE:			MI
		ZIP:			48103
		BUSINESS PHONE:		7342142000

	MAIL ADDRESS:	
		STREET 1:		5840 INTERFACE DR
		CITY:			ANN ARBOR
		STATE:			MI
		ZIP:			48103

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			SIERK DENNIS A
		CENTRAL INDEX KEY:			0001249768

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-15481
		FILM NUMBER:		03816568

	MAIL ADDRESS:	
		STREET 1:		5840 INTERFACE DRIVE
		CITY:			ANN ARBOR
		STATE:			AL
		ZIP:			48103
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar123.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0201</schemaVersion>

    <documentType>4</documentType>
    <periodOfReport>2003-07-29</periodOfReport>
    <notSubjectToSection16>1</notSubjectToSection16>
    <issuer>
        <issuerCik>0000892832</issuerCik>
        <issuerName>NEMATRON CORP</issuerName>
        <issuerTradingSymbol>NMN</issuerTradingSymbol>
    </issuer>

    <reportingOwner>

        <reportingOwnerId>
            <rptOwnerCik>0001249768</rptOwnerCik>
            <rptOwnerName>SIERK DENNIS A</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>5840 INTERFACE DR.</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>ANN ARBOR</rptOwnerCity>
            <rptOwnerState>MI</rptOwnerState>
            <rptOwnerZipCode>48103</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
        <isDirector>0</isDirector>
        <isOfficer>1</isOfficer>
        <isTenPercentOwner>0</isTenPercentOwner>
        <isOther>0</isOther>
        <officerTitle>VP-Pdct Mgmt &amp; Pres-Optim.</officerTitle>
    </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>

        <securityTitle>
            <value>common stock</value>
        </securityTitle>

        <transactionDate>
            <value>2003-07-29</value>
        </transactionDate>
    <transactionCoding>
        <transactionFormType>4</transactionFormType>
        <transactionCode>S</transactionCode>
        <equitySwapInvolved>0</equitySwapInvolved>
    </transactionCoding>
        <transactionAmounts>

            <transactionShares>
                <value>10000</value>
            </transactionShares>

            <transactionPricePerShare>
                <value>.20</value>
            </transactionPricePerShare>

            <transactionAcquiredDisposedCode>
                <value>D</value>
            </transactionAcquiredDisposedCode>
        </transactionAmounts>
        <postTransactionAmounts>

            <sharesOwnedFollowingTransaction>
                <value>1395620</value>
            </sharesOwnedFollowingTransaction>
        </postTransactionAmounts>
        <ownershipNature>

            <directOrIndirectOwnership>
                <value>D</value>
            </directOrIndirectOwnership>
        </ownershipNature>
        </nonDerivativeTransaction>

    </nonDerivativeTable>
    <ownerSignature>
        <signatureName>Dennis Sierk</signatureName>
        <signatureDate>2003-07-29</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Dennis Sierk</signatureName>
        <signatureDate>2003-07-29</signatureDate>
    </ownerSignature>

</ownershipDocument>

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