<SEC-DOCUMENT>0001567619-20-018855.txt : 20201106
<SEC-HEADER>0001567619-20-018855.hdr.sgml : 20201106
<ACCEPTANCE-DATETIME>20201106162337
ACCESSION NUMBER:		0001567619-20-018855
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20201104
FILED AS OF DATE:		20201106
DATE AS OF CHANGE:		20201106

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Peterffy Thomas
		CENTRAL INDEX KEY:			0001391405

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-33440
		FILM NUMBER:		201294740

	MAIL ADDRESS:	
		STREET 1:		ONE PICKWICK PLAZA
		CITY:			GREENWICH
		STATE:			CT
		ZIP:			06830

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:				300390693
		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>4
<SEQUENCE>1
<FILENAME>doc1.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2020-11-04</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

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

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001391405</rptOwnerCik>
            <rptOwnerName>Peterffy Thomas</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>PHILLIPS POINT EAST TOWER, SUITE 1001</rptOwnerStreet1>
            <rptOwnerStreet2>777 S. FLAGLER DRIVE</rptOwnerStreet2>
            <rptOwnerCity>WEST PALM BEACH</rptOwnerCity>
            <rptOwnerState>FL</rptOwnerState>
            <rptOwnerZipCode>33401</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chairman</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A common stock</value>
            </securityTitle>
            <transactionDate>
                <value>2020-11-04</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>9699</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>48.41</value>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>9962612</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A common stock</value>
            </securityTitle>
            <transactionDate>
                <value>2020-11-04</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>5501</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>48.73</value>
                    <footnoteId id="F3"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>9957111</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A common stock</value>
            </securityTitle>
            <transactionDate>
                <value>2020-11-05</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>14400</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>49.08</value>
                    <footnoteId id="F4"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>9942711</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person.</footnote>
        <footnote id="F2">The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $47.65 to $48.64, inclusive. The Reporting Person undertakes to provide Interactive Brokers Group, Inc. (the &quot;Company&quot;), any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each price within the ranges set forth in footnotes (2) - (4) to this Form 4.</footnote>
        <footnote id="F3">The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $48.65 to $48.80, inclusive.</footnote>
        <footnote id="F4">The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $48.58 to $49.53, inclusive.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Raymond Bussiere as authorized signatory for Thomas Peterffy</signatureName>
        <signatureDate>2020-11-06</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24.1
<SEQUENCE>2
<FILENAME>poa-tp_20201106.htm
<DESCRIPTION>POWER OF ATTORNEY
<TEXT>
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  <head>
    <title></title>
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<body bgcolor="#ffffff" style="font-family: 'Times New Roman', Times, serif; font-size: 11pt; text-align: left; color: #000000;">
  <div>
    <div style="text-align: center; font-size: 10pt; font-weight: bold;">POWER OF ATTORNEY</div>
    <div><br>
    </div>
    <div style="text-align: justify; font-size: 12pt;"><font style="font-size: 10pt;">&#160;&#160;&#160; Know all by these presents, that the undersigned hereby constitutes and
        appoints each of, Raymond P. Bussiere, Denis Mendonca, and Michael Sellitto</font>&#160;<font style="font-size: 10pt;">each
        of them individually, the undersigned's true and lawful attorney-in-fact to:</font></div>
    <div><br>
    </div>
    <div style="text-align: justify; font-size: 10pt;">1) prepare, execute in the undersigned's name and on the undersigned's behalf, and submit to the U.S. Securities and Exchange Commission (the "SEC") a Form
      ID, including amendments thereto, and any other documents necessary or appropriate to obtain codes and passwords enabling the undersigned to make electronic filings with the SEC of reports required by Section 16(a) of the Securities Exchange Act of
      1934 or any rule or regulation of the SEC;</div>
    <div><br>
    </div>
    <div style="text-align: justify; font-size: 10pt;">2) execute for and on behalf of the undersigned, in the undersigned's capacity as an officer and/or director of Interactive Brokers Group, Inc.&#160; (the
      "Company"), Forms 3, 4, and 5 in accordance with Section 16(a) of the Securities Exchange Act of 1934 and the rules thereunder, and any other forms or reports the undersigned may be required to file in connection with the undersigned's ownership,
      acquisition, or disposition of securities of the Company;</div>
    <div><br>
    </div>
    <div style="text-align: justify; font-size: 10pt;">3) do and perform any and all acts for and on behalf of the undersigned which may be necessary or desirable to complete and execute any such Form 3, 4, or
      5, or other form or report, and timely file such form or report with the United States Securities and Exchange Commission and any stock exchange or similar authority; and</div>
    <div><br>
    </div>
    <div style="text-align: justify; font-size: 10pt;">4) take any other action or any type whatsoever in connection with the foregoing which, in the opinion of such attorney-in-fact, may be of benefit to, in
      the best interest of, or legally required by, the undersigned, it being understood that the documents executed by such attorney-in-fact on behalf of the undersigned pursuant to this Power of Attorney shall be in such form and shall contain such terms
      and conditions as such attorney-in-fact may approve in such attorney-in-fact's discretion.</div>
    <div style="text-align: justify; font-size: 10pt;"> <br>
    </div>
    <div style="text-indent: 13.5pt; font-size: 10pt;">The undersigned hereby grants to each such attorney-in-fact full power and authority to do and perform any and every act and thing
      whatsoever requisite, necessary or proper to be done in the exercise of any of the rights and powers herein granted, as fully to all intents and purposes as the undersigned might or could do if personally present, with full power of substitution or
      revocation, hereby ratifying and confirming all that such attorney-in-fact, or such attorney-in-fact's substitute or substitutes, shall lawfully do or cause to be done by virtue of this power of attorney and the rights and powers herein granted.&#160; The
      undersigned acknowledges that the foregoing attorneys-in-fact, in serving in such capacity at the request of the undersigned, are not assuming, nor is the Company assuming, any of the undersigned's responsibilities to comply with Section 16 of the
      Securities Exchange Act of 1934.</div>
    <div style="text-indent: 13.5pt; font-size: 10pt;"> <br>
      </div>
    <div style="text-indent: 13.5pt; font-size: 10pt;">This Power of Attorney supersedes and replaces any prior
        instruments executed by the undersigned which grant a power of attorney to any person in connection with the subject matter of this Power of Attorney, and any authority granted pursuant to any such prior power of attorney is hereby revoked
        effective as of the date hereof.&#160; This revocation shall not affect the validity of any act properly carried out by my lawfully appointed attorneys-in-fact prior to the date hereof.</div>
    <div style="text-indent: 13.5pt; font-size: 10pt;"> <br>
    </div>
    <div style="text-indent: 13.5pt; font-size: 10pt;">This Power of Attorney shall remain in full force and effect until the undersigned is no longer required to file Forms 3, 4, and 5 with
      respect to the undersigned's holdings of and transactions in securities issued by the Company, unless earlier revoked by the undersigned in a signed writing delivered to the foregoing attorneys-in-fact.</div>
    <div><br>
    </div>
    <div style="font-size: 10pt;">&#160;&#160;&#160;&#160;IN WITNESS THEREOF, the undersigned has caused this Power of Attorney to be executed as of this 6 <sup style="vertical-align: text-top; line-height: 1; font-size: smaller;">th</sup> day of November 2020.</div>
    <div><br>
    </div>
    <div><br>
    </div>
    <div><br>
    </div>
    <div style="font-size: 10pt;"><u>/s/ Thomas Peterffy&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; <br>
      </u></div>
    <div style="font-size: 10pt;">Thomas Peterffy</div>
    <div style="margin-top: 12pt; margin-bottom: 12pt; font-size: 10pt;"> <br>
    </div>
    <div style="margin-top: 12pt; margin-bottom: 12pt; font-size: 10pt;">STATE OF FLORIDA<br>
      &#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;</div>
    <div style="text-indent: 36pt; margin-left: 108pt; margin-top: 12pt; margin-bottom: 12pt; font-size: 10pt;">ss: at West Palm Beach on <u>November 6</u>, 2020</div>
    <div style="margin-top: 12pt; margin-bottom: 12pt; font-size: 10pt;">COUNTY OF&#160;&#160; <u>Palm Beach &#160; &#160; &#160; &#160;&#160;</u> &#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; <br>
    </div>
    <div style="font-size: 10pt;">Personally Appeared&#160;<u> Thomas Peterffy </u>, Signer and Sealer of the foregoing instrument, and acknowledged the same to be
      his/her free act and deed, before me.&#160;</div>
    <div style="margin-top: 12pt; margin-bottom: 12pt;"><font style="font-size: 10pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;</font><u><font id="TRGRRTFtoHTMLTab" style="display: inline-block; text-indent: 0px; font-size: 1px; width: 180pt"> </font><font style="font-size: 10pt;">/s/ Judith Casasampere Farrera&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; <br>
        </font></u></div>
    <div>&#160; <u><font style="font-size: 10pt;"></font></u><font style="font-size: 10pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;</font><font id="TRGRRTFtoHTMLTab" style="display: inline-block; text-indent: 0px; font-size: 1px; width: 216pt"> </font><font style="font-size: 10pt;">Notary Public&#160;&#160; GG 919512<br>
        </font><br>
    </div>
    <div style="text-indent: 36pt; margin-left: 144pt; font-size: 10pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; My commission expires: January 27, 2024<br>
      &#160;</div>
    <div><br>
    </div>
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