-----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,
 CCUOvNXnQfGxeEC2Xso59bV/16+i3hWb0rLeqRr1klrirvG+dCLY3qX0mljUxVwW
 XbPKVFKrdu6YAm+fQAez8w==

<SEC-DOCUMENT>0001209191-10-002425.txt : 20100108
<SEC-HEADER>0001209191-10-002425.hdr.sgml : 20100108
<ACCEPTANCE-DATETIME>20100108113048
ACCESSION NUMBER:		0001209191-10-002425
CONFORMED SUBMISSION TYPE:	D
PUBLIC DOCUMENT COUNT:		1
ITEM INFORMATION:		Rule 506
FILED AS OF DATE:		20100108
DATE AS OF CHANGE:		20100108
EFFECTIVENESS DATE:		20100108

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Main Street Capital CORP
		CENTRAL INDEX KEY:			0001396440
		IRS NUMBER:				412230745
		STATE OF INCORPORATION:			MD
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		D
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	021-137586
		FILM NUMBER:		10516500

	BUSINESS ADDRESS:	
		STREET 1:		1300 POST OAK BOULEVARD
		STREET 2:		SUITE 800
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77056
		BUSINESS PHONE:		(713) 350-6000

	MAIL ADDRESS:	
		STREET 1:		1300 POST OAK BOULEVARD
		STREET 2:		SUITE 800
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77056
</SEC-HEADER>
<DOCUMENT>
<TYPE>D
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<edgarSubmission>

    <schemaVersion>X0603</schemaVersion>

    <submissionType>D</submissionType>

    <testOrLive>LIVE</testOrLive>

    <primaryIssuer>
        <cik>0001396440</cik>
        <entityName>Main Street Capital CORP</entityName>
        <issuerAddress>
            <street1>1300 Post Oak Blvd.</street1>
            <street2>Suite 800</street2>
            <city>Houston</city>
            <stateOrCountry>TX</stateOrCountry>
            <zipCode>77056</zipCode>
        </issuerAddress>
        <issuerPhoneNumber>713-350-6000</issuerPhoneNumber>
        <jurisdictionOfInc>MARYLAND</jurisdictionOfInc>
        <issuerPreviousNameList>
            <value>None</value>
        </issuerPreviousNameList>
        <edgarPreviousNameList>
            <value>None</value>
        </edgarPreviousNameList>
        <entityType>Corporation</entityType>
        <yearOfInc>
            <withinFiveYears>true</withinFiveYears>
            <value>2007</value>
        </yearOfInc>
    </primaryIssuer>

    <relatedPersonsList>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Vincent</firstName>
                <middleName>D.</middleName>
                <lastName>Foster</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>1300 Post Oak Blvd.</street1>
                <street2>Suite 800</street2>
                <city>Houston</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77056</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Todd</firstName>
                <middleName>A.</middleName>
                <lastName>Reppert</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>1300 Post Oak Blvd.</street1>
                <street2>Suite 800</street2>
                <city>Houston</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77056</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Dwayne</firstName>
                <middleName>L.</middleName>
                <lastName>Hyzak</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>1300 Post Oak Blvd.</street1>
                <street2>Suite 800</street2>
                <city>Houston</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77056</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Curtis</firstName>
                <middleName>L.</middleName>
                <lastName>Hartman</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>1300 Post Oak Blvd.</street1>
                <street2>Suite 800</street2>
                <city>Houston</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77056</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>David</firstName>
                <middleName>L.</middleName>
                <lastName>Magdol</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>1300 Post Oak Blvd.</street1>
                <street2>Suite 800</street2>
                <city>Houston</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77056</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Michael</firstName>
                <middleName>S.</middleName>
                <lastName>Galvan</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>1300 Post Oak Blvd.</street1>
                <street2>Suite 800</street2>
                <city>Houston</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77056</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Michael</firstName>
                <lastName>Appling</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>1300 Post Oak Blvd.</street1>
                <street2>Suite 800</street2>
                <city>Houston</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77056</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Arthur</firstName>
                <middleName>L.</middleName>
                <lastName>French</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>1300 Post Oak Blvd.</street1>
                <street2>Suite 800</street2>
                <city>Houston</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77056</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Joseph</firstName>
                <middleName>E.</middleName>
                <lastName>Canon</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>1300 Post Oak Blvd.</street1>
                <street2>Suite 800</street2>
                <city>Houston</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77056</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>William</firstName>
                <middleName>D.</middleName>
                <lastName>Gutermuth</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>1300 Post Oak Blvd.</street1>
                <street2>Suite 800</street2>
                <city>Houston</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77056</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Rodger</firstName>
                <middleName>A.</middleName>
                <lastName>Stout</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>1300 Post Oak Blvd.</street1>
                <street2>Suite 800</street2>
                <city>Houston</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77056</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Jason</firstName>
                <middleName>B.</middleName>
                <lastName>Beauvais</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>1300 Post Oak Blvd.</street1>
                <street2>Suite 800</street2>
                <city>Houston</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77056</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
    </relatedPersonsList>

    <offeringData>
        <industryGroup>
            <industryGroupType>Pooled Investment Fund</industryGroupType>
            <investmentFundInfo>
                <investmentFundType>Other Investment Fund</investmentFundType>
                <is40Act>false</is40Act>
            </investmentFundInfo>
        </industryGroup>
        <issuerSize>
            <aggregateNetAssetValueRange>Over $100,000,000</aggregateNetAssetValueRange>
        </issuerSize>
        <federalExemptionsExclusions>
            <item>06</item>
        </federalExemptionsExclusions>
        <typeOfFiling>
            <newOrAmendment>
                <isAmendment>false</isAmendment>
            </newOrAmendment>
            <dateOfFirstSale>
                <value>2010-01-07</value>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>false</moreThanOneYear>
        </durationOfOffering>
        <typesOfSecuritiesOffered>
            <isEquityType>true</isEquityType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>true</isBusinessCombinationTransaction>
            <clarificationOfResponse>Made in connection with Exchange Offer for Main Street Capital II, LP limited partnership interests.</clarificationOfResponse>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>0</minimumInvestmentAccepted>
        <salesCompensationList></salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>19900000</totalOfferingAmount>
            <totalAmountSold>19900000</totalAmountSold>
            <totalRemaining>0</totalRemaining>
            <clarificationOfResponse></clarificationOfResponse>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>false</hasNonAccreditedInvestors>
            <totalNumberAlreadyInvested>87</totalNumberAlreadyInvested>
        </investors>
        <salesCommissionsFindersFees>
            <salesCommissions>
                <dollarAmount>0</dollarAmount>
            </salesCommissions>
            <findersFees>
                <dollarAmount>0</dollarAmount>
            </findersFees>
            <clarificationOfResponse></clarificationOfResponse>
        </salesCommissionsFindersFees>
        <useOfProceeds>
            <grossProceedsUsed>
                <dollarAmount>0</dollarAmount>
            </grossProceedsUsed>
            <clarificationOfResponse></clarificationOfResponse>
        </useOfProceeds>
        <signatureBlock>
            <authorizedRepresentative>false</authorizedRepresentative>
            <signature>
                <issuerName>Main Street Capital Corporation</issuerName>
                <signatureName>/s/ Rodger A. Stout</signatureName>
                <nameOfSigner>Rodger A. Stout</nameOfSigner>
                <signatureTitle>Chief Compliance Officer</signatureTitle>
                <signatureDate>2010-01-07</signatureDate>
            </signature>
        </signatureBlock>
    </offeringData>
</edgarSubmission>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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