<SEC-DOCUMENT>0000902664-19-002034.txt : 20190425
<SEC-HEADER>0000902664-19-002034.hdr.sgml : 20190425
<ACCEPTANCE-DATETIME>20190425145444
ACCESSION NUMBER:		0000902664-19-002034
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20190418
FILED AS OF DATE:		20190425
DATE AS OF CHANGE:		20190425

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Uhde Philip
		CENTRAL INDEX KEY:			0001772442

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-33440
		FILM NUMBER:		19767029

	MAIL ADDRESS:	
		STREET 1:		63 CROSBY STREET, 4TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10012

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Echinus Advisors, LLC
		CENTRAL INDEX KEY:			0001602970
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-33440
		FILM NUMBER:		19767030

	BUSINESS ADDRESS:	
		STREET 1:		63 CROSBY STREET
		STREET 2:		4TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10012
		BUSINESS PHONE:		6467597903

	MAIL ADDRESS:	
		STREET 1:		63 CROSBY STREET
		STREET 2:		4TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10012

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Interactive Brokers Group, Inc.
		CENTRAL INDEX KEY:			0001381197
		STANDARD INDUSTRIAL CLASSIFICATION:	SECURITY BROKERS, DEALERS & FLOTATION COMPANIES [6211]
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		ONE PICKWICK PLAZA
		CITY:			GREENWICH
		STATE:			CT
		ZIP:			06830
		BUSINESS PHONE:		203-618-5800

	MAIL ADDRESS:	
		STREET 1:		ONE PICKWICK PLAZA
		CITY:			GREENWICH
		STATE:			CT
		ZIP:			06830
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>ownership.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2019-04-18</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001381197</issuerCik>
        <issuerName>Interactive Brokers Group, Inc.</issuerName>
        <issuerTradingSymbol>IBKR</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001602970</rptOwnerCik>
            <rptOwnerName>Echinus Advisors, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>63 CROSBY STREET</rptOwnerStreet1>
            <rptOwnerStreet2>4TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10012</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <officerTitle></officerTitle>
            <otherText>See Remarks</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001772442</rptOwnerCik>
            <rptOwnerName>Uhde Philip</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>63 CROSBY STREET, 4TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10012</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <officerTitle></officerTitle>
            <otherText>See Remarks</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Class A Common Stock, par value $0.01 per share</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>2411525</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnote</value>
                    <footnoteId id="F1"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">These securities are held for the account of Echinus Partners, LP, a Delaware limited partnership (the &quot;Echinus Fund&quot;). Echinus Advisors, LLC, a Delaware limited liability Company (&quot;Echinus&quot;), serves as the investment manager to the Echinus Fund. Mr. Philip Uhde (&quot;Mr. Uhde&quot;) is the manager and majority controlling person of Echinus. In such capacities, each of Echinus and Mr. Uhde may be deemed to beneficially own the securities herein. Each Reporting Person disclaims beneficial ownership of the securities reported herein except to the extent of his or its pecuniary interest therein, if any.</footnote>
    </footnotes>

    <remarks>Echinus may be deemed a director by deputization of the Issuer by virtue of the fact that Mr. Uhde, currently serves on the board of directors of the Issuer.</remarks>

    <ownerSignature>
        <signatureName>/s/ Philip Uhde</signatureName>
        <signatureDate>2019-04-25</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Echinus Advisors, LLC: by /s/ Philip Yang, its Chief Financial Officer &amp; Chief Compliance Officer</signatureName>
        <signatureDate>2019-04-25</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
