-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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 LmEfiztWTXzJgt9+i3srXQ==

<SEC-DOCUMENT>0001181431-07-041663.txt : 20070621
<SEC-HEADER>0001181431-07-041663.hdr.sgml : 20070621
<ACCEPTANCE-DATETIME>20070621175732
ACCESSION NUMBER:		0001181431-07-041663
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20070619
FILED AS OF DATE:		20070621
DATE AS OF CHANGE:		20070621

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			TA IX LP
		CENTRAL INDEX KEY:			0001121410
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-51828
		FILM NUMBER:		07934781

	BUSINESS ADDRESS:	
		STREET 1:		HIGH STREET TOWER
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02110

	MAIL ADDRESS:	
		STREET 1:		125 HIGH ST
		STREET 2:		STE 2500
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02110

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Eagle Test Systems, Inc.
		CENTRAL INDEX KEY:			0001290096
		STANDARD INDUSTRIAL CLASSIFICATION:	INSTRUMENTS FOR MEAS & TESTING OF ELECTRICITY & ELEC SIGNALS [3825]
		IRS NUMBER:				362917389
		STATE OF INCORPORATION:			IL
		FISCAL YEAR END:			0930

	BUSINESS ADDRESS:	
		STREET 1:		2200 MILLBROOK DRIVE
		CITY:			BUFFALO GROVE
		STATE:			IL
		ZIP:			60089
		BUSINESS PHONE:		(847)367-8282

	MAIL ADDRESS:	
		STREET 1:		2200 MILLBROOK DRIVE
		CITY:			BUFFALO GROVE
		STATE:			IL
		ZIP:			60089
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>rrd163680.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2007-06-19</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001290096</issuerCik>
        <issuerName>Eagle Test Systems, Inc.</issuerName>
        <issuerTradingSymbol>EGLT</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001121410</rptOwnerCik>
            <rptOwnerName>TA IX LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>JOHN HANCOCK TOWER</rptOwnerStreet1>
            <rptOwnerStreet2>200 CLARENDON ST. 56TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02116</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>See General Remarks</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2007-06-19</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>1208</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>17</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>4372014</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <remarks>Member of a group which owns more than 10% in the aggregate.</remarks>

    <ownerSignature>
        <signatureName>TA IX L.P.</signatureName>
        <signatureDate>2007-06-21</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>By: TA Associates IX LLC, its General Partner</signatureName>
        <signatureDate>2007-06-21</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>By: TA Associates, Inc., its Manager</signatureName>
        <signatureDate>2007-06-21</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>By: Thomas P. Alber, Chief Financial Officer</signatureName>
        <signatureDate>2007-06-21</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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