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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 DlfFXK/9AgVCtSmJncreXEDXas+jQLmYdv9/CV0JI4n7GpNx22PS3qdzZfJSnv/e
 4vP/K3eiAz1vL+V9f/VFBg==

<SEC-DOCUMENT>0001179110-07-018296.txt : 20070914
<SEC-HEADER>0001179110-07-018296.hdr.sgml : 20070914
<ACCEPTANCE-DATETIME>20070914115603
ACCESSION NUMBER:		0001179110-07-018296
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20070913
FILED AS OF DATE:		20070914
DATE AS OF CHANGE:		20070914

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MCF CORP
		CENTRAL INDEX KEY:			0000826683
		STANDARD INDUSTRIAL CLASSIFICATION:	SECURITY BROKERS, DEALERS & FLOTATION COMPANIES [6211]
		IRS NUMBER:				112936371
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		600 CALIFORNIA STREET
		STREET 2:		NINTH FLOOR
		CITY:			SAN FRANCISCO
		STATE:			CA
		ZIP:			94108
		BUSINESS PHONE:		(415) 248-5640

	MAIL ADDRESS:	
		STREET 1:		600 CALIFORNIA STREET
		STREET 2:		NINTH FLOOR
		CITY:			SAN FRANCISCO
		STATE:			CA
		ZIP:			94108

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	RATEXCHANGE CORP
		DATE OF NAME CHANGE:	20000512

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	NETAMERICA COM CORP
		DATE OF NAME CHANGE:	19991116

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	NETAMERICA INTERNATIONAL INC
		DATE OF NAME CHANGE:	19981207

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			ARBOR PATRICK
		CENTRAL INDEX KEY:			0001265122

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-15831
		FILM NUMBER:		071116982

	BUSINESS ADDRESS:	
		STREET 1:		MCF CORP.
		STREET 2:		601 MONTGOMERY ST.
		CITY:			SAN FRANCISCO
		STATE:			CA
		ZIP:			94111
		BUSINESS PHONE:		415 248 5634

	MAIL ADDRESS:	
		STREET 1:		600 CALIFORNIA STREET, 9TH FLOOR
		CITY:			SAN FRANCISCO
		STATE:			CA
		ZIP:			94108
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>FORM 4 -
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2007-09-13</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000826683</issuerCik>
        <issuerName>MCF CORP</issuerName>
        <issuerTradingSymbol>MEM</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001265122</rptOwnerCik>
            <rptOwnerName>ARBOR PATRICK</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>600 CALIFORNIA STREET, 9TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SAN FRANCISCO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94108</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2007-09-13</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>1000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>3.95</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>72037</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes></footnotes>

    <ownerSignature>
        <signatureName>Patrick Arbor</signatureName>
        <signatureDate>2007-09-14</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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