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

    <schemaVersion>X0202</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2007-01-16</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001325460</issuerCik>
        <issuerName>ATS CORP</issuerName>
        <issuerTradingSymbol>ATCT</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001264694</rptOwnerCik>
            <rptOwnerName>GLASER JONATHAN M</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>11601 WILSHIRE BLVD., SUITE 2180</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>LOS ANGELES</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>90025</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1494740</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Notes</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Warrants (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>5</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2007-01-16</value>
            </exerciseDate>
            <expirationDate>
                <value>2009-10-19</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>1453000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Notes</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Mr. Glaser is a control person of JMG Capital Management, Inc., a California corporation (&quot;JMG&quot;), JMG Capital Management, LLC, a Delaware limited liability company (&quot;JMG LLC&quot;), Pacific Capital Management, Inc., a California corporation (&quot;PCM&quot;) and Pacific Assets Management, LLC, a Delaware limited liability company (&quot;PAM&quot;).  PAM is the investment adviser to an investment fund and PCM is a member of PAM.  JMG LLC is the investment adviser and general partner of an investment limited partnership and JMG is a member of JMG LLC.  These securities are held directly by the investment limited partnership of which JMG LLC is investment adviser and general partner and the investment fund of which PAM is the investment adviser, for the benefit of the investors in that partnership and that fund.</footnote>
        <footnote id="F2">Mr. Glaser disclaims beneficial ownership of such securities except to the extent of his pecuniary interest therein.  These securities became subject to Section 16 of the Securities Exchange Act of 1934, as amended, due to the issuer's completion of the acquisition of Advanced Technology Systems, Inc. and the warrants reported on this Form 3 becoming exercisable as a result thereof.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Jonathan M. Glaser</signatureName>
        <signatureDate>2007-02-15</signatureDate>
    </ownerSignature>
</ownershipDocument>
