-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 CrWO1BiKZEsllpSwaJqwVLpwHFdJ33iOs2+BSn56strQPBPpHpzbHFgCJCYcfdhN
 G7qLZ5vjOqxhWLS4o6+BXw==

<SEC-DOCUMENT>0000827221-10-000002.txt : 20100927
<SEC-HEADER>0000827221-10-000002.hdr.sgml : 20100927
<ACCEPTANCE-DATETIME>20100927133045
ACCESSION NUMBER:		0000827221-10-000002
CONFORMED SUBMISSION TYPE:	D
PUBLIC DOCUMENT COUNT:		1
ITEM INFORMATION:		Rule 506
FILED AS OF DATE:		20100927
DATE AS OF CHANGE:		20100927
EFFECTIVENESS DATE:		20100927

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MESIROW FINANCIAL HOLDINGS INC
		CENTRAL INDEX KEY:			0000827221
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE

	FILING VALUES:
		FORM TYPE:		D
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	021-148201
		FILM NUMBER:		101090455

	BUSINESS ADDRESS:	
		STREET 1:		353 N CLARK ST
		CITY:			CHICAGO
		STATE:			IL
		ZIP:			60654
		BUSINESS PHONE:		3125956000

	MAIL ADDRESS:	
		STREET 1:		353 N CLARK ST
		CITY:			CHICAGO
		STATE:			IL
		ZIP:			60654
</SEC-HEADER>
<DOCUMENT>
<TYPE>D
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
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        <cik>0000827221</cik>
        <entityName>MESIROW FINANCIAL HOLDINGS INC</entityName>
        <issuerAddress>
            <street1>353 N CLARK ST</street1>
            <city>CHICAGO</city>
            <stateOrCountry>IL</stateOrCountry>
            <stateOrCountryDescription>ILLINOIS</stateOrCountryDescription>
            <zipCode>60654</zipCode>
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        <issuerPhoneNumber>3125956000</issuerPhoneNumber>
        <jurisdictionOfInc>DELAWARE</jurisdictionOfInc>
        <issuerPreviousNameList>
            <previousName>Mesirow Holding Company, Inc.</previousName>
            <previousName>Mesirow Financial Corporation</previousName>
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            <relatedPersonName>
                <firstName>James</firstName>
                <middleName>C.</middleName>
                <lastName>Tyree</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>353 North Clark Street</street1>
                <city>Chicago</city>
                <stateOrCountry>IL</stateOrCountry>
                <stateOrCountryDescription>ILLINOIS</stateOrCountryDescription>
                <zipCode>60654</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Thomas</firstName>
                <middleName>E.</middleName>
                <lastName>Galuhn</lastName>
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                <street1>353 North Clark Street</street1>
                <city>Chicago</city>
                <stateOrCountry>IL</stateOrCountry>
                <stateOrCountryDescription>ILLINOIS</stateOrCountryDescription>
                <zipCode>60654</zipCode>
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            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
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        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Jeffrey</firstName>
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            <relatedPersonRelationshipList>
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            <relatedPersonName>
                <firstName>Ruth</firstName>
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                <lastName>Hannenberg</lastName>
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                <street1>353 North Clark Street</street1>
                <city>Chicago</city>
                <stateOrCountry>IL</stateOrCountry>
                <stateOrCountryDescription>ILLINOIS</stateOrCountryDescription>
                <zipCode>60654</zipCode>
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            <relatedPersonRelationshipList>
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                <firstName>Martin</firstName>
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                <street1>353 North Clark Street</street1>
                <city>Chicago</city>
                <stateOrCountry>IL</stateOrCountry>
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                <zipCode>60654</zipCode>
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            <relatedPersonRelationshipList>
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                <relationship>Director</relationship>
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            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Gerald</firstName>
                <middleName>J.</middleName>
                <lastName>Levin</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>353 North Clark Street</street1>
                <city>Chicago</city>
                <stateOrCountry>IL</stateOrCountry>
                <stateOrCountryDescription>ILLINOIS</stateOrCountryDescription>
                <zipCode>60654</zipCode>
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            <relatedPersonRelationshipList>
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                <relationship>Director</relationship>
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            <relationshipClarification></relationshipClarification>
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        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Richard</firstName>
                <middleName>S.</middleName>
                <lastName>Price</lastName>
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                <street1>353 North Clark Street</street1>
                <city>Chicago</city>
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            <relatedPersonRelationshipList>
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            <relationshipClarification></relationshipClarification>
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        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Howard</firstName>
                <middleName>M.</middleName>
                <lastName>Rossman</lastName>
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            <relatedPersonAddress>
                <street1>353 North Clark Street</street1>
                <city>Chicago</city>
                <stateOrCountry>IL</stateOrCountry>
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                <zipCode>60654</zipCode>
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            <relatedPersonRelationshipList>
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            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
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        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Marc</firstName>
                <middleName>E.</middleName>
                <lastName>Sacks</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>353 North Clark Street</street1>
                <city>Chicago</city>
                <stateOrCountry>IL</stateOrCountry>
                <stateOrCountryDescription>ILLINOIS</stateOrCountryDescription>
                <zipCode>60654</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Ralph</firstName>
                <middleName>S.</middleName>
                <lastName>Tuliano</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>353 North Clark Street</street1>
                <city>Chicago</city>
                <stateOrCountry>IL</stateOrCountry>
                <stateOrCountryDescription>ILLINOIS</stateOrCountryDescription>
                <zipCode>60654</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Julie</firstName>
                <middleName>E.</middleName>
                <lastName>Vander Weele</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>353 North Clark Street</street1>
                <city>Chicago</city>
                <stateOrCountry>IL</stateOrCountry>
                <stateOrCountryDescription>ILLINOIS</stateOrCountryDescription>
                <zipCode>60654</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
                <relationship>Director</relationship>
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            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Stephen</firstName>
                <middleName>C.</middleName>
                <lastName>Vogt</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>353 North Clark Street</street1>
                <city>Chicago</city>
                <stateOrCountry>IL</stateOrCountry>
                <stateOrCountryDescription>ILLINOIS</stateOrCountryDescription>
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            <relatedPersonRelationshipList>
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            <relationshipClarification></relationshipClarification>
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        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Bruce</firstName>
                <middleName>J.</middleName>
                <lastName>Young</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>353 North Clark Street</street1>
                <city>Chicago</city>
                <stateOrCountry>IL</stateOrCountry>
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                <zipCode>60654</zipCode>
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            <relationshipClarification></relationshipClarification>
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        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Dennis</firstName>
                <middleName>B.</middleName>
                <lastName>Black</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>353 North Clark Street</street1>
                <city>Chicago</city>
                <stateOrCountry>IL</stateOrCountry>
                <stateOrCountryDescription>ILLINOIS</stateOrCountryDescription>
                <zipCode>60654</zipCode>
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            <relatedPersonRelationshipList>
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            <relationshipClarification></relationshipClarification>
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        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Kristie</firstName>
                <middleName>P.</middleName>
                <lastName>Paskvan</lastName>
            </relatedPersonName>
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                <street1>353 North Clark Street</street1>
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                <stateOrCountry>IL</stateOrCountry>
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            <relatedPersonRelationshipList>
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            <relationshipClarification></relationshipClarification>
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    <offeringData>
        <industryGroup>
            <industryGroupType>Other</industryGroupType>
        </industryGroup>
        <issuerSize>
            <revenueRange>Over $100,000,000</revenueRange>
        </issuerSize>
        <federalExemptionsExclusions>
            <item>06</item>
        </federalExemptionsExclusions>
        <typeOfFiling>
            <newOrAmendment>
                <isAmendment>false</isAmendment>
            </newOrAmendment>
            <dateOfFirstSale>
                <value>2010-09-15</value>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>false</moreThanOneYear>
        </durationOfOffering>
        <typesOfSecuritiesOffered>
            <isEquityType>true</isEquityType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>false</isBusinessCombinationTransaction>
            <clarificationOfResponse></clarificationOfResponse>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>15000</minimumInvestmentAccepted>
        <salesCompensationList></salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>23494119</totalOfferingAmount>
            <totalAmountSold>23494119</totalAmountSold>
            <totalRemaining>0</totalRemaining>
            <clarificationOfResponse></clarificationOfResponse>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>true</hasNonAccreditedInvestors>
            <numberNonAccreditedInvestors>15</numberNonAccreditedInvestors>
            <totalNumberAlreadyInvested>133</totalNumberAlreadyInvested>
        </investors>
        <salesCommissionsFindersFees>
            <salesCommissions>
                <dollarAmount>0</dollarAmount>
            </salesCommissions>
            <findersFees>
                <dollarAmount>0</dollarAmount>
            </findersFees>
            <clarificationOfResponse>N/A</clarificationOfResponse>
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            <clarificationOfResponse>N/A</clarificationOfResponse>
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        <signatureBlock>
            <authorizedRepresentative>false</authorizedRepresentative>
            <signature>
                <issuerName>MESIROW FINANCIAL HOLDINGS INC</issuerName>
                <signatureName>/s/ Dennis B. Black</signatureName>
                <nameOfSigner>Dennis B. Black</nameOfSigner>
                <signatureTitle>General Counsel</signatureTitle>
                <signatureDate>2010-09-27</signatureDate>
            </signature>
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</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----