<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2011-02-22</periodOfReport>

    <notSubjectToSection16>1</notSubjectToSection16>

    <issuer>
        <issuerCik>0000925661</issuerCik>
        <issuerName>SECTOR 10 INC</issuerName>
        <issuerTradingSymbol>SECI</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001454419</rptOwnerCik>
            <rptOwnerName>DeAvila Pericles P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>630 EAGLEPOINT DR.</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NORTH SALT LAKE CITY</rptOwnerCity>
            <rptOwnerState>UT</rptOwnerState>
            <rptOwnerZipCode>84054</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>Resign as Officer/Director</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <remarks>Sector 10, Inc. entered into Stock Exchange Agreements on January 7, 2011 with Solar Tracer Corporation and on February 3, 2011 with First Diversified Equities, Inc.  The closing of each transaction resulted in a Change in Control of Sector 10, Inc.  In a Form 8-K filed on February 9, 2011, the Company announced that new management and board members will be elected and that Pericles DeAvila would be relaced as CEO immediately after the filing of the Form 10-Q for the period ended December 31, 2010.  The Form 10-Q for the period ended December 31, 2010 was filed on February 22, 2011.  In accordance with the disclosures set forth in the Form 8-K, Pericles DeAvila submitted his resignation as President, CEO, Chairman of the Board of Directors and as a Member of the Board of Directors of Sector 10, Inc.  The resignations were effective February 22, 2011. With this resignation, Mr. DeAvila no longer is an officer, director or affiliate of Sector 10, Inc. or its successors.</remarks>

    <ownerSignature>
        <signatureName>Pericles P. DeAvila</signatureName>
        <signatureDate>2011-02-28</signatureDate>
    </ownerSignature>
</ownershipDocument>
