-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
 BWc5k9RYajPB/rtwpTP1zcDkD1s8+lPpOEZ5npx1eUkW8yONbwVX9OBYXZvgPWr2
 XzhPJo5ikOVO4kHZyzblOg==

<SEC-DOCUMENT>0001315211-06-000001.txt : 20060615
<SEC-HEADER>0001315211-06-000001.hdr.sgml : 20060615
<ACCEPTANCE-DATETIME>20060615141742
ACCESSION NUMBER:		0001315211-06-000001
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20060613
FILED AS OF DATE:		20060615
DATE AS OF CHANGE:		20060615

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			GTUIERREZ STEPHAN
		CENTRAL INDEX KEY:			0001315211

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-51099
		FILM NUMBER:		06906990

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		515-223-3788

	MAIL ADDRESS:	
		STREET 1:		2829 WESTOWN PARKWAY
		STREET 2:		SUITE 200
		CITY:			WEST DES MOINES
		STATE:			IA
		ZIP:			50266

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			FCStone Group, Inc.
		CENTRAL INDEX KEY:			0001297846
		STANDARD INDUSTRIAL CLASSIFICATION:	 [6221]
		IRS NUMBER:				421091210
		STATE OF INCORPORATION:			IA
		FISCAL YEAR END:			0831

	BUSINESS ADDRESS:	
		STREET 1:		2829 WESTOWN PARKWAY
		STREET 2:		SUITE 200
		CITY:			WEST DES MOINES
		STATE:			IA
		ZIP:			50266
		BUSINESS PHONE:		(800) 422-3087

	MAIL ADDRESS:	
		STREET 1:		2829 WESTOWN PARKWAY
		STREET 2:		SUITE 200
		CITY:			WEST DES MOINES
		STATE:			IA
		ZIP:			50266
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2006-06-13</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001297846</issuerCik>
        <issuerName>FCStone Group, Inc.</issuerName>
        <issuerTradingSymbol>None</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001315211</rptOwnerCik>
            <rptOwnerName>GTUIERREZ STEPHAN</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>2829 WESTOWN PARKWAY</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 200</rptOwnerStreet2>
            <rptOwnerCity>WEST DES MOINES</rptOwnerCity>
            <rptOwnerState>IA</rptOwnerState>
            <rptOwnerZipCode>50266</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>EVP and COO</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Stock Option (Right to Buy)</value>
                <footnoteId id="F1"/>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>24.76</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2006-06-13</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>35000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>24.76</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2006-06-13</value>
            </exerciseDate>
            <expirationDate>
                <value>2016-06-13</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>35000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>35000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Options issued pursuant to the FCStine Group, Inc. 2006 Equity Incentive Plan.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Robert V. Johnson</signatureName>
        <signatureDate>2006-06-15</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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