-----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,
 B0+w7vX9xw22GeATe1rnILgVmsSueGXXn2NA2SrLdqjfzVmjLaeGM6HCAOqEc1kp
 nIBC0xlsgUZt4LaoPjybvQ==

<SEC-DOCUMENT>0001181431-03-007767.txt : 20030515
<SEC-HEADER>0001181431-03-007767.hdr.sgml : 20030515
<ACCEPTANCE-DATETIME>20030515163930
ACCESSION NUMBER:		0001181431-03-007767
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20030513
FILED AS OF DATE:		20030515

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ENTERPRISE FINANCIAL SERVICES CORP
		CENTRAL INDEX KEY:			0001025835
		STANDARD INDUSTRIAL CLASSIFICATION:	STATE COMMERCIAL BANKS [6022]
		IRS NUMBER:				431706259
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		150 NORTH MERAMEC
		STREET 2:		150 NORTH MERAMEC
		CITY:			CLAYTON
		STATE:			MO
		ZIP:			63105
		BUSINESS PHONE:		3147255500

	MAIL ADDRESS:	
		STREET 1:		150 NORTH MERAMEC
		STREET 2:		150 NORTH MERAMEC
		CITY:			CLAYTON
		STATE:			MO
		ZIP:			63105

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ENTERBANK HOLDINGS INC
		DATE OF NAME CHANGE:	19961024

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			SANFILIPPO FRANK H
		CENTRAL INDEX KEY:			0001096117

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-15373
		FILM NUMBER:		03705453

	BUSINESS ADDRESS:	
		STREET 1:		11901 OLIVE BOULEVARD
		CITY:			ST LOUIS
		STATE:			MO
		ZIP:			63141
		BUSINESS PHONE:		3149958700

	MAIL ADDRESS:	
		STREET 1:		11901 OLIVE BOULEVARD
		CITY:			ST LOUIS
		STATE:			MO
		ZIP:			63141
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>rrd8959.xml
<DESCRIPTION>FORM 4 - SANFILIPPO
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>
    <schemaVersion>X0101</schemaVersion>

<documentType>4</documentType>
<periodOfReport>2003-05-13</periodOfReport>
<notSubjectToSection16>0</notSubjectToSection16>
<issuer><issuerCik>0001025835</issuerCik>
        <issuerName>ENTERPRISE FINANCIAL SERVICES CORP</issuerName>
<issuerTradingSymbol>EFSC</issuerTradingSymbol></issuer>
<reportingOwner>
<reportingOwnerId>
<rptOwnerCik>0001096117</rptOwnerCik>
            <rptOwnerName>SANFILIPPO FRANK H</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>  </rptOwnerStreet1>
            <rptOwnerStreet2>  </rptOwnerStreet2>
            <rptOwnerCity>  </rptOwnerCity>
            <rptOwnerState>  </rptOwnerState>
            <rptOwnerZipCode>  </rptOwnerZipCode>
        </reportingOwnerAddress>
<reportingOwnerRelationship>
<isDirector>0</isDirector>
<isOfficer>1</isOfficer>
<isTenPercentOwner>0</isTenPercentOwner>
<isOther>0</isOther>
<officerTitle>Chief Financial Officer</officerTitle>
<otherText></otherText></reportingOwnerRelationship></reportingOwner>
<derivativeSecurity>
<securityTitle>
<value>NON-QUALIFIED STOCK OPTION (RIGHT TO BUY)</value></securityTitle>
<conversionOrExercisePrice>
<value>13.40</value></conversionOrExercisePrice>
<transactionDate>
<value>2003-05-13</value></transactionDate>
<transactionCoding>
<transactionFormType>4</transactionFormType>
<transactionCode>A</transactionCode>
<equitySwapInvolved>0</equitySwapInvolved></transactionCoding>
<transactionAmounts>
<transactionShares>
<value>11194</value></transactionShares>
<transactionValue>
<value>13.40</value></transactionValue>
<transactionAcquiredDisposedCode>
<value>A</value></transactionAcquiredDisposedCode></transactionAmounts>
<exerciseDate>
<value>2006-05-13</value></exerciseDate>
<expirationDate>
<value>2013-05-13</value></expirationDate>
<underlyingSecurity>
<underlyingSecurityTitle>
<value>COMMON STOCK</value></underlyingSecurityTitle>
<underlyingSecurityShares>
<value>11194</value></underlyingSecurityShares></underlyingSecurity>
<postTransactionAmounts>
<sharesOwnedFollowingTransaction>
<value>11194</value></sharesOwnedFollowingTransaction></postTransactionAmounts>
<ownershipNature>
<directOrIndirectOwnership>
<value>D</value></directOrIndirectOwnership>
<natureOfOwnership>
<value></value></natureOfOwnership></ownershipNature></derivativeSecurity>
<ownerSignature>
<signatureName>FRANK SANFILIPPO BY POWER OF ATTORNEY</signatureName>
<signatureDate>2003-05-15</signatureDate></ownerSignature></ownershipDocument>


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