<SEC-DOCUMENT>0001127602-21-011291.txt : 20210318
<SEC-HEADER>0001127602-21-011291.hdr.sgml : 20210318
<ACCEPTANCE-DATETIME>20210318134620
ACCESSION NUMBER:		0001127602-21-011291
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20210316
FILED AS OF DATE:		20210318
DATE AS OF CHANGE:		20210318

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			COWAN CAROLE A
		CENTRAL INDEX KEY:			0001282783

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-33912
		FILM NUMBER:		21753854

	MAIL ADDRESS:	
		STREET 1:		MIDDLESEX COMMUNITY COLLEGE
		STREET 2:		33 KEARNEY SQUARE
		CITY:			LOWELL
		STATE:			MA
		ZIP:			01852

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ENTERPRISE BANCORP INC /MA/
		CENTRAL INDEX KEY:			0001018399
		STANDARD INDUSTRIAL CLASSIFICATION:	STATE COMMERCIAL BANKS [6022]
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			MA
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		222 MERRIMACK ST
		CITY:			LOWELL
		STATE:			MA
		ZIP:			01852
		BUSINESS PHONE:		9784599000

	MAIL ADDRESS:	
		STREET 1:		222 MERRIMACK ST
		CITY:			LOWELL
		STATE:			MA
		ZIP:			01852
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>form4.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2021-03-16</periodOfReport>

    <issuer>
        <issuerCik>0001018399</issuerCik>
        <issuerName>ENTERPRISE BANCORP INC /MA/</issuerName>
        <issuerTradingSymbol>EBTC</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001282783</rptOwnerCik>
            <rptOwnerName>COWAN CAROLE A</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O ENTERPRISE BANCORP</rptOwnerStreet1>
            <rptOwnerStreet2>222 MERRIMACK STREET</rptOwnerStreet2>
            <rptOwnerCity>LOWELL</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>01852</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2021-03-16</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>477</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>22465.3398</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Includes 168.8257 shares acquired through the Issuer's dividend reinvestment plan on 6/1/2020.</footnote>
        <footnote id="F2">Includes 171.7100 shares acquired through the Issuer's dividend reinvestment plan on 9/1/2020.</footnote>
        <footnote id="F3">Includes 146.9663 shares acquired through the Issuer's dividend reinvestment plan on 12/1/2020.</footnote>
        <footnote id="F4">Includes 132.3522 shares acquired through the Issuer's dividend reinvestment plan on 3/1/2021.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ John P. Clancy, Jr. as attorney-in-fact for Carole A. Cowan</signatureName>
        <signatureDate>2021-03-18</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>