<SEC-DOCUMENT>0001140361-17-029623.txt : 20170801
<SEC-HEADER>0001140361-17-029623.hdr.sgml : 20170801
<ACCEPTANCE-DATETIME>20170801165752
ACCESSION NUMBER:		0001140361-17-029623
CONFORMED SUBMISSION TYPE:	SC 13D/A
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20170801
DATE AS OF CHANGE:		20170801
GROUP MEMBERS:		THOMAS PETERFFY

SUBJECT COMPANY:	

	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

	FILING VALUES:
		FORM TYPE:		SC 13D/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-82876
		FILM NUMBER:		17997370

	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

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			IBG Holdings LLC
		CENTRAL INDEX KEY:			0001399812
		IRS NUMBER:				352296543
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13D/A

	BUSINESS ADDRESS:	
		STREET 1:		ONE PICKWICK PLAZA
		CITY:			GREENWICH
		STATE:			CT
		ZIP:			06830
		BUSINESS PHONE:		2036185800

	MAIL ADDRESS:	
		STREET 1:		ONE PICKWICK PLAZA
		CITY:			GREENWICH
		STATE:			CT
		ZIP:			06830
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13D/A
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<FILENAME>ibgholdings-13d_a5.htm
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<title>ibgholdings-13d_a5.htm</title>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; TEXT-ALIGN: center; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">(Name of Issuer)</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; TEXT-ALIGN: center; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">(CUSIP Number)</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; TEXT-ALIGN: center; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">Thomas Peterffy</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; TEXT-ALIGN: center; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">IBG Holdings LLC</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; TEXT-ALIGN: center; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">One Pickwick Plaza</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; TEXT-ALIGN: center; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">Greenwich, CT 06830</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; TEXT-ALIGN: center; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">Copy to:</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; TEXT-ALIGN: center; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">Richard Goldberg, Esq.</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; TEXT-ALIGN: center; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">1095 Avenue of the Americas</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; TEXT-ALIGN: center; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">New York, NY 10036</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; TEXT-ALIGN: center; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">(212) 698-3500</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; TEXT-ALIGN: center; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">(Name, Address and Telephone Number of Person</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; TEXT-ALIGN: center; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">Authorized to Receive Notices and Communications)</div>

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<div style="TEXT-ALIGN: center; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; FONT-WEIGHT: bold; DISPLAY: inline">July 28, 2017</font>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; TEXT-ALIGN: left; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 36pt">If the filing person has previously filed a statement on Schedule 13G to report the acquisition which is the subject of this Schedule 13D, and is filing this schedule because of Sections 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box. [&#160;&#160;&#160;]</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; TEXT-ALIGN: left; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 36pt"><font style="FONT-WEIGHT: bold; DISPLAY: inline">Note:</font> Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. &#160;See Section 240.13d-7 for other parties to whom copies are to be sent.</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; TEXT-ALIGN: left; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 36pt">*The remainder of this cover page shall be filled out for a reporting person&#8217;s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page.</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; TEXT-ALIGN: left; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 36pt">The information required on the remainder of this cover page shall not be deemed to be &#8220;filed&#8221; for the purpose of Section 18 of the Securities Exchange Act of 1934 (&#8220;Act&#8221;) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">CUSIP Number 45841N 107</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: center; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">1.</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">&#160;Names of Reporting Person</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; FONT-WEIGHT: bold; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">&#160;I.R.S. Identification No. 35-2296543</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: center; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">2.</div>
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<div><font style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; DISPLAY: inline">&#160;&#160; &#160; Check the Appropriate Box if a Member of a Group (See</font><font style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; DISPLAY: inline">&#160;Instructions)&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;</font></div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">(a) <font style="FONT-SIZE: 10pt; FONT-FAMILY: wingdings; DISPLAY: inline">x</font></div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">(b) <font style="FONT-FAMILY: wingdings; DISPLAY: inline">o</font></div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">&#160;SEC Use Only</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: center; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">4.</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">&#160;Source of Funds (See Instructions)</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; FONT-WEIGHT: bold; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">&#160;OO</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: center; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">5.</div>
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<div><font style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; DISPLAY: inline">&#160;&#160;&#160; Check if Disclosure of Legal Proceedings is Required</font><font style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; DISPLAY: inline"> Pursuant to Items 2(d) or 2(e)</font>&#160;</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: wingdings; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">o</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: center; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">6.</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">Citizenship or Place of Organization</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; FONT-WEIGHT: bold; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">Delaware, United States of America</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">Number of</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">Shares</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">Beneficially Owned by</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">Each</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">Reporting</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">Person</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">With</div>
</td>
<td style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: center; WIDTH: 8%" valign="top">7.&#160; </td>
<td style="FONT-FAMILY: 'Times New Roman'; BORDER-BOTTOM: black 2px solid; WIDTH: 70%" valign="top">
<div>
<div style="MARGIN-LEFT: 9pt">Sole Voting Power</div>

<div style="MARGIN-LEFT: 9pt"><font style="FONT-WEIGHT: bold">2,301,060 <font style="FONT-SIZE: 70%; FONT-FAMILY: 'times new roman'; FONT-VARIANT: normal; TEXT-TRANSFORM: none; FONT-STYLE: normal">(1)</font></font>&#160;</div>
</div>

<div style="FONT-WEIGHT: bold; MARGIN-LEFT: 9pt">340,229,444 <font style="FONT-SIZE: 70%; FONT-FAMILY: 'times new roman'; FONT-VARIANT: normal; TEXT-TRANSFORM: none; FONT-STYLE: normal">(2)</font></div>
</td>
</tr>

<tr>
<td style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: center; WIDTH: 8%" valign="top">8.</td>
<td style="BORDER-BOTTOM: black 2px solid; WIDTH: 70%" valign="top">
<div style="TEXT-ALIGN: center; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">Shared Voting Power<a id="schedule13dworkingdraft_htm_ole_link1" name="schedule13dworkingdraft_htm_ole_link1"></a></div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; FONT-WEIGHT: bold; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">Not applicable</div>
</div>
</td>
</tr>

<tr>
<td style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: center; WIDTH: 8%" valign="top">9.</td>
<td style="BORDER-BOTTOM: black 2px solid; WIDTH: 70%" valign="top">
<div style="TEXT-ALIGN: center; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">Sole Dispositive Power</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; FONT-WEIGHT: bold; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">2,301,060 <font style="FONT-SIZE: 70%; VERTICAL-ALIGN: text-top; DISPLAY: inline">(1)</font></div>
</div>
</td>
</tr>

<tr>
<td style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: center; WIDTH: 8%" valign="top">10.</td>
<td style="BORDER-BOTTOM: black 2px solid; WIDTH: 70%" valign="top">
<div style="TEXT-ALIGN: center; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">Shared Dispositive Power</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; FONT-WEIGHT: bold; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">Not applicable</div>
</div>
</td>
</tr>
</table>

<table id="z240fb3c0a87b48b0a1549aee928a91a0" style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; WIDTH: 100%" cellspacing="0" cellpadding="0" border="0">
<tr>
<td style="BORDER-BOTTOM: black 2px solid; WIDTH: 7%" valign="top">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: center; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">11.</div>
</td>
<td style="BORDER-BOTTOM: black 2px solid" valign="top">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: justify; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">Aggregate Amount Beneficially Owned by Each Reporting Person</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; FONT-WEIGHT: bold; TEXT-ALIGN: justify; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">2,301,060 <font style="FONT-SIZE: 70%; VERTICAL-ALIGN: text-top; DISPLAY: inline">(1)</font></div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; FONT-WEIGHT: bold; TEXT-ALIGN: justify; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">340,229,444 <font style="FONT-SIZE: 70%; VERTICAL-ALIGN: text-top; DISPLAY: inline">(2)</font></div>
</td>
</tr>
</table>

<table id="z8d5853ea143142c3bf667f6e1c293828" style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; WIDTH: 100%" cellspacing="0" cellpadding="0" border="0">
<tr>
<td style="BORDER-BOTTOM: black 2px solid; WIDTH: 7%" valign="top">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: center; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">12.</div>
</td>
<td style="BORDER-BOTTOM: black 2px solid; WIDTH: 82%" valign="top">
<div><font style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; DISPLAY: inline">&#160;&#160;&#160; Check if the Aggregate Amount in Row (11) Excludes&#160;</font><font style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; DISPLAY: inline">Certain Shares (See Instructions)&#160;&#160;&#160;&#160;&#160;</font></div>
</td>
<td style="BORDER-BOTTOM: black 2px solid; WIDTH: 11%" valign="top">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: wingdings; TEXT-ALIGN: justify; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">o</div>
</td>
</tr>

<tr>
<td style="BORDER-BOTTOM: black 2px solid; WIDTH: 7%" valign="top">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: center; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">13.</div>
</td>
<td style="BORDER-BOTTOM: black 2px solid" valign="top" colspan="2">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: justify; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">Percent of Class Represented by Amount in Row (11)</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; FONT-WEIGHT: bold; TEXT-ALIGN: justify; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: -9pt">&#160;&#160; &#160;83.2%<font style="FONT-SIZE: 70%; VERTICAL-ALIGN: text-top; DISPLAY: inline">(3)</font></div>
</td>
</tr>

<tr>
<td style="BORDER-BOTTOM: black 2px solid; WIDTH: 7%" valign="top">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: center; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">14.</div>
</td>
<td style="BORDER-BOTTOM: black 2px solid" valign="top" colspan="2">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: justify; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">Type of Reporting Person (See Instructions)</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; FONT-WEIGHT: bold; TEXT-ALIGN: justify; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">HC</div>
</td>
</tr>
</table>
</div>

<div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>

<div style="TEXT-ALIGN: center">&#160;</div>

<div>
<div style="TEXT-ALIGN: center">
<table id="hangingindent" style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; WIDTH: 100%" cellspacing="0" cellpadding="0" border="0">
<tr valign="top">
<td style="WIDTH: 360pt">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">(1)</div>
</td>
<td style="WIDTH: 98%">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: left">IBG Holdings LLC beneficially owns 2,301,060 shares of Class A common stock, which were acquired on July 28, 2017 and July 28, 2016.</div>
</td>
</tr>
</table>
</div>

<div style="DISPLAY: block; TEXT-INDENT: 0pt"><br>
</div>

<div style="TEXT-ALIGN: center">
<table id="hangingindent" style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; WIDTH: 100%" cellspacing="0" cellpadding="0" border="0">
<tr valign="top">
<td style="WIDTH: 360pt">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">(2)</div>
</td>
<td style="WIDTH: 98%">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: left">Pursuant to the Amended and Restated Certificate of Incorporation of the issuer, IBG Holdings LLC, as the sole holder of the 100 outstanding shares of the issuer&#8217;s Class B common stock, is entitled to the number of votes equal to the number of IBG LLC membership interests held by it at any given time. As of the date of this statement, IBG Holdings LLC holds 340,229,444 IBG LLC membership interests.</div>
</td>
</tr>
</table>
</div>

<div style="DISPLAY: block; TEXT-INDENT: 0pt"><br>
</div>

<div style="TEXT-ALIGN: center">
<table id="hangingindent" style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; WIDTH: 100%" cellspacing="0" cellpadding="0" border="0">
<tr valign="top">
<td style="WIDTH: 360pt">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">(3)</div>
</td>
<td style="WIDTH: 98%">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: left">IBG Holdings LLC&#8217;s beneficial ownership of 2,301,060 shares of Class A common stock represents approximately 3.2% of the outstanding shares of Class A common stock and approximately 0.6% of the voting power of the issuer.&#160;&#160;IBG Holdings LLC&#8217;s beneficial ownership of the 100 outstanding shares of the issuer&#8217;s Class B common stock entitles it to approximately 82.6% of the voting power of the issuer.&#160;&#160;In total, IBG Holdings LLC holds approximately 83.2% of the voting power of the issuer.</div>
</td>
</tr>
</table>
</div>

<br>
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<div id="PGBRK" style="MARGIN-LEFT: 0pt; WIDTH: 100%; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">
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<div id="PN" style="PAGE-BREAK-AFTER: always; WIDTH: 100%">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; TEXT-ALIGN: center; WIDTH: 100%">2</div>

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<hr style="COLOR: black" size="2" noshade="noshade">
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<div id="HDR">
<div id="GLHDR" style="FONT-SIZE: 8pt; FONT-FAMILY: Times New Roman; TEXT-ALIGN: right; WIDTH: 100%"></div>
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<div style="DISPLAY: block; TEXT-INDENT: 0pt"><br>
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<div>
<table id="zfe2675483c47497a84d1c285b2a6110c" style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; WIDTH: 100%" cellspacing="0" cellpadding="0">
<tr>
<td style="FONT-SIZE: 10pt; BORDER-TOP: medium none; FONT-FAMILY: times new roman; BORDER-BOTTOM: black 2px solid; WIDTH: 45%" valign="top" colspan="4" align="left">&#160;</td>
<td style="FONT-SIZE: 10pt; BORDER-TOP: medium none; FONT-FAMILY: times new roman; BORDER-BOTTOM: black 2px solid; WIDTH: 20%" valign="top" align="left">&#160;</td>
<td style="FONT-SIZE: 10pt; BORDER-TOP: medium none; FONT-FAMILY: times new roman; BORDER-BOTTOM: black 2px solid; WIDTH: 35%" valign="top" colspan="2" align="left">&#160;</td>
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<tr>
<td style="BORDER-TOP: medium none; BORDER-BOTTOM: black 2px solid; WIDTH: 45%" valign="top" colspan="4" align="left">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">CUSIP Number 45841N 107</div>
</td>
<td style="FONT-SIZE: 10pt; BORDER-TOP: medium none; FONT-FAMILY: times new roman; BORDER-BOTTOM: black 2px solid; WIDTH: 20%" valign="top" align="left">&#160; </td>
<td style="FONT-SIZE: 10pt; BORDER-TOP: medium none; FONT-FAMILY: times new roman; BORDER-BOTTOM: black 2px solid; WIDTH: 35%" valign="top" colspan="2" align="left">&#160; </td>
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<td style="BORDER-BOTTOM: black 2px solid; WIDTH: 7%" valign="top">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: center; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">1.</div>
</td>
<td style="BORDER-BOTTOM: black 2px solid; WIDTH: 93%" valign="top" colspan="6" align="left">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">&#160;Names of Reporting Person</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; FONT-WEIGHT: bold; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">&#160;Thomas Peterffy</div>
</td>
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<tr>
<td style="BORDER-BOTTOM: black 2px solid; WIDTH: 7%" valign="top">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: center; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">2.</div>
</td>
<td style="BORDER-BOTTOM: black 2px solid; WIDTH: 38%" valign="top" colspan="4" align="left">
<div><font style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; DISPLAY: inline">&#160;&#160;&#160;&#160; Check the Appropriate Box if a Member of a Group (See</font><font style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; DISPLAY: inline"> Instructions)&#160;&#160;&#160;&#160;</font></div>
</td>
<td style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; BORDER-BOTTOM: black 2px solid; WIDTH: 24%" valign="top" align="left">&#160;</td>
<td style="BORDER-BOTTOM: black 2px solid; WIDTH: 11%" valign="top" align="left">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt"><font style="FONT-SIZE: 10pt; DISPLAY: inline">(a) </font><font style="FONT-SIZE: 10pt; FONT-FAMILY: wingdings; DISPLAY: inline">x</font></div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">(b) <font style="FONT-FAMILY: wingdings; DISPLAY: inline">o</font></div>
</td>
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<tr>
<td style="BORDER-BOTTOM: black 2px solid; WIDTH: 7%" valign="top">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: center; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">3.</div>
</td>
<td style="BORDER-BOTTOM: black 2px solid; WIDTH: 93%" valign="top" colspan="6" align="left">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">&#160;SEC Use Only</div>
</td>
</tr>

<tr>
<td style="BORDER-BOTTOM: black 2px solid; WIDTH: 7%" valign="top">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: center; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">4.</div>
</td>
<td style="BORDER-BOTTOM: black 2px solid; WIDTH: 93%" valign="top" colspan="6" align="left">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">&#160;Source of Funds (See Instructions)</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; FONT-WEIGHT: bold; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">&#160;OO</div>
</td>
</tr>

<tr>
<td style="BORDER-BOTTOM: black 2px solid; WIDTH: 7%" valign="top">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: center; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">5.</div>
</td>
<td style="BORDER-BOTTOM: black 2px solid; WIDTH: 38%" valign="top" colspan="5" align="left">
<div><font style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; DISPLAY: inline">&#160;&#160; &#160; Check if Disclosure of Legal Proceedings is Required&#160;</font><font style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; DISPLAY: inline">Pursuant to Items 2(d) or 2(e)&#160;&#160;&#160;&#160;</font></div>
</td>
<td style="BORDER-BOTTOM: black 2px solid; WIDTH: 11%" valign="top" align="left">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">&#160;&#160;&#160;&#160;&#160;<font style="FONT-SIZE: 10pt; FONT-FAMILY: wingdings; DISPLAY: inline">o</font></div>
</td>
</tr>

<tr>
<td style="BORDER-BOTTOM: black 2px solid; WIDTH: 7%" valign="top">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: center; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">6.</div>
</td>
<td style="BORDER-BOTTOM: black 2px solid; WIDTH: 93%" valign="top" colspan="6" align="left">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">&#160;Citizenship or Place of Organization</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; FONT-WEIGHT: bold; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">&#160;United States of America</div>
</td>
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<tr>
<td style="PADDING-BOTTOM: 2px; WIDTH: 22%" valign="top" rowspan="4" colspan="2" align="left">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">Number of</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">Shares</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">Beneficially Owned by</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">Each</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">Reporting</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">Person</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">With</div>
</td>
<td style="BORDER-BOTTOM: black 2px solid; WIDTH: 8%" valign="top">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: center; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">7.</div>
</td>
<td style="BORDER-BOTTOM: black 2px solid; WIDTH: 70%" valign="top" colspan="4">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: justify; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">Sole Voting Power</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; FONT-WEIGHT: bold; TEXT-ALIGN: justify; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">2,301,060 <font style="FONT-SIZE: 70%; VERTICAL-ALIGN: text-top; DISPLAY: inline">(1)</font></div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; FONT-WEIGHT: bold; TEXT-ALIGN: justify; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">340,229,444 <font style="FONT-SIZE: 70%; VERTICAL-ALIGN: text-top; DISPLAY: inline">(2)</font></div>
</td>
</tr>

<tr>
<td style="BORDER-BOTTOM: black 2px solid; WIDTH: 8%" valign="top">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: center; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">8.</div>
</td>
<td style="BORDER-BOTTOM: black 2px solid; WIDTH: 70%" valign="top" colspan="4" align="left">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">Shared Voting Power</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; FONT-WEIGHT: bold; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">Not applicable</div>
</td>
</tr>

<tr>
<td style="BORDER-BOTTOM: black 2px solid; WIDTH: 8%" valign="top">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: center; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">9.</div>
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<td style="BORDER-BOTTOM: black 2px solid; WIDTH: 70%" valign="top" colspan="4" align="left">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">Sole Dispositive Power</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; FONT-WEIGHT: bold; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">2,301,060 <font style="FONT-SIZE: 70%; VERTICAL-ALIGN: text-top; DISPLAY: inline">(1)</font></div>
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</tr>

<tr>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: center; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">10.</div>
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<td style="BORDER-BOTTOM: black 2px solid; WIDTH: 70%" valign="top" colspan="4" align="left">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">Shared Dispositive Power</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; FONT-WEIGHT: bold; TEXT-ALIGN: left; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">Not applicable</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: center; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">11.</div>
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<td style="BORDER-BOTTOM: black 2px solid; WIDTH: 93%" valign="top" colspan="6">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: justify; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">&#160;Aggregate Amount Beneficially Owned by Each Reporting Person</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; FONT-WEIGHT: bold; TEXT-ALIGN: justify; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">&#160;2,301,060 <font style="FONT-SIZE: 70%; VERTICAL-ALIGN: text-top; DISPLAY: inline">(1)</font></div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; FONT-WEIGHT: bold; TEXT-ALIGN: justify; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">&#160;340,229,444 <font style="FONT-SIZE: 70%; VERTICAL-ALIGN: text-top; DISPLAY: inline">(2)</font></div>
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<td style="BORDER-BOTTOM: black 2px solid; WIDTH: 7%" valign="top">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: center; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">12.</div>
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<td style="BORDER-BOTTOM: black 2px solid; WIDTH: 15%" valign="top" colspan="5">
<div><font style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; DISPLAY: inline">&#160; &#160;&#160; Check if the Aggregate Amount in Row (11) Excludes</font><font style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; DISPLAY: inline">&#160;Certain Shares (See Instructions)&#160;&#160;&#160;&#160;&#160;</font></div>
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<td style="BORDER-BOTTOM: black 2px solid; WIDTH: 16%" valign="top">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: justify; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">&#160;&#160;&#160;&#160;&#160;<font style="FONT-SIZE: 10pt; FONT-FAMILY: wingdings; DISPLAY: inline">o</font></div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: center; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">13.</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: justify; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">&#160;Percent of Class Represented by Amount in Row (11)</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; FONT-WEIGHT: bold; TEXT-ALIGN: justify; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: -9pt">&#160;&#160;&#160;&#160; 83.2%<font style="FONT-SIZE: 70%; VERTICAL-ALIGN: text-top; DISPLAY: inline">(3)</font></div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: center; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">14.</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: justify; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">&#160;Type of Reporting Person (See Instructions)</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; FONT-WEIGHT: bold; TEXT-ALIGN: justify; MARGIN-LEFT: 9pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">&#160;IN</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">(1)</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: left">Mr. Thomas Peterffy, through the ownership of his revocable trust of the voting membership interests in IBG Holdings LLC, beneficially owns 2,301,060 shares of Class A common stock, which were acquired on July 28, 2017 and July 28, 2016. Beneficial ownership for this purpose includes the ability to vote the shares and the power to sell the shares. Mr. Thomas Peterffy has no economic interest in these shares of Class A common stock. The economic interest in these shares accrues to those members of IBG Holdings LLC who redeemed their membership interests on July 28, 2017 and July 28, 2016.</div>
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<div style="DISPLAY: block; TEXT-INDENT: 0pt"><br>
</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">(2)</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: left">Pursuant to the Amended and Restated Certificate of Incorporation of the issuer, Mr. Thomas Peterffy, through the ownership of his revocable trust of the voting membership interest in IBG Holdings LLC, beneficially owns all of the 100 outstanding shares of the issuer&#8217;s Class B common stock and accordingly is entitled to the number of votes equal to the number of IBG LLC membership interests held by IBG Holdings LLC at any given time.&#160;&#160;As of the date of this statement, IBG Holdings LLC holds 340,229,444 IBG LLC membership interests.</div>
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<div style="DISPLAY: block; TEXT-INDENT: 0pt"><br>
</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">(3)</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-ALIGN: left">Mr. Thomas Peterffy, through the ownership of his revocable trust of the voting membership interests in IBG Holdings LLC, beneficially owns 2,301,060 shares of Class A common stock, which represents approximately 3.2% of the outstanding shares of Class A common stock and approximately 0.6% of the voting power of the issuer.&#160;&#160;In addition, through his revocable trust&#8217;s ownership of the voting membership interests in IBG Holdings LLC, Mr. Thomas Peterffy beneficially owns all of the 100 outstanding shares of the issuer&#8217;s Class B common stock and accordingly holds approximately 82.6% of the voting power of the issuer through such ownership.&#160;&#160;In total, Mr. Thomas Peterffy holds approximately 83.2% of the voting power of the issuer through his revocable trust&#8217;s ownership of the voting membership interests in IBG Holdings LLC.</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; DISPLAY: block; TEXT-INDENT: 0pt"><font style="FONT-WEIGHT: bold; DISPLAY: inline">Introductory Note:</font><font style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; FONT-WEIGHT: normal; DISPLAY: inline">This Amendment No. 5 to the Schedule 13D (this &#8220;Amendment&#8221;) filed by IBG Holdings LLC (&#8220;IBG Holdings&#8221;) and Thomas Peterffy (together with IBG Holdings, the &#8220;Reporting Persons&#8221;) relates to the acquisition of 1,214,860 shares of Class A common stock of Interactive Brokers Group, Inc. (the &#8220;Company&#8221;) by the Reporting Persons on July 28, 2017 and IBG Holdings' ownership of<font style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; FONT-WEIGHT: normal; DISPLAY: inline">&#160;</font>1,086,200 shares of Class A common stock which were acquired on July 28, 2016.</font> This Amendment amends and supplements the Schedule 13D filed on May 17, 2007, which has been previously amended on November 18, 2013, October 24, 2014, July 24, 2015 and July 28, 2016 (the &#8220;Schedule 13D&#8221;) with respect to the Class A common stock of the Company. Except as specified in this Amendment, all previous Items are unchanged. Unless otherwise indicated herein, capitalized terms used but not defined in this Amendment shall have the same meanings herein as are ascribed to such terms in the Schedule 13D.</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; FONT-WEIGHT: bold; TEXT-ALIGN: left; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">Item 1. &#160;Security and Issuer</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; TEXT-ALIGN: left; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">The third paragraph of Item 1 is hereby amended and restated to read as follows:</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; TEXT-ALIGN: left; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 36pt">Pursuant to the Amended and Restated Certificate of Incorporation of the Company (the &#8220;<font style="TEXT-DECORATION: underline; DISPLAY: inline">Restated Charter</font>&#8221;), IBG Holdings, as the sole holder of the 100 outstanding shares of the Class B common stock, is entitled to the number of votes equal to the number of IBG LLC membership interests held by it at any given time. As of the date of this statement, IBG Holdings holds 340,229,444 IBG LLC membership interests, and, as a result, the Class B common stock held by IBG Holdings represents approximately 82.6% of the voting power of the Company.&#160;Mr. Thomas Peterffy, through his revocable trust&#8217;s ownership of the voting membership interests in IBG Holdings, beneficially owns all of the outstanding shares of the Class B common stock, which represent approximately 82.6% of the voting power of the Company.</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; TEXT-ALIGN: left; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">The following paragraph is hereby added to Item 1:</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; TEXT-ALIGN: left; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 36pt">On July 28, 2017, consistent with the terms of that certain Exchange Agreement entered into by and among the Company, IBG Holdings and IBG&#160;LLC and the former members of IBG LLC, previously filed as exhibit 99.3 to this Schedule 13D on May 17, 2007, as amended by that certain amendment previously filed as exhibit 10.1 to the Form 8-K filed on June 12, 2012 and as further amended by that certain amendment filed as an exhibit 10.1 to the Form 10-Q on November 9, 2015, IBG Holdings acquired<font style="FONT-SIZE: 10pt; DISPLAY: inline">&#160;</font>1,214,860 shares of Class A common stock from the Company in exchange for<font style="FONT-SIZE: 10pt; DISPLAY: inline">&#160;</font>1,214,860 membership interests owned by IBG Holdings in IBG LLC and certain tax benefit payments as described in the tax receivable agreement between IBG Holdings and the Company and previously filed as exhibit 10.3 to Form 10-Q on June 15, 2007 (the &#8220;<font style="TEXT-DECORATION: underline; DISPLAY: inline">TRA</font>&#8221;). Such 1,214,860 shares of Class A common stock represent approximately 1.7% of the outstanding shares of Class A common stock and approximately 0.3% of the voting power of the Company. Additionally, 1,086,200 shares of Class A common stock acquired on July 28, 2016 and enrolled in the 2016 Plans were not sold pursuant to such Plans and are still owned by IBG Holdings. Mr. Thomas Peterffy, through his revocable trust&#8217;s ownership of the voting membership interests in IBG Holdings, beneficially owns such 2,301,060 shares of Class A common stock, which represent approximately 0.6% of the voting power of the Company.</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; FONT-WEIGHT: bold; TEXT-ALIGN: left; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">Item 4. &#160;Purpose of Transaction</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; TEXT-ALIGN: left; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">Item 4 is hereby supplemented by adding the following paragraph:</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; TEXT-ALIGN: left; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 36pt">On July 28, 2017, IBG Holdings acquired 1,214,860 shares of Class A common stock in exchange for 1,214,860 membership interests owned by IBG Holdings in IBG LLC and certain tax benefit payments as described in the TRA. It is intended that the shares of Class A common stock acquired by IBG Holdings will be sold in open market transactions and the proceeds used to purchase the IBG Holdings&#8217; membership interests (or portions thereof) of certain of IBG Holdings&#8217; members who have elected to redeem their IBG Holdings membership interests (or portion thereof). The shares to be sold will be sold in open market transactions pursuant to Rule 10b5-1 trading plans, more fully described in &#8220;Item 6&#8212;Contracts, Arrangements, Understandings or Relationships With Respect to the Securities of the Issuer&#8221; of this report.</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; FONT-WEIGHT: bold; TEXT-ALIGN: left; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">Item 5. &#160;Interest in Securities of the Issuer</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; TEXT-ALIGN: left; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">Paragraph (b) of Item 5 is hereby amended and restated to read as follows:</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; TEXT-ALIGN: left; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 36pt">(b) Rows (7) through (10) of the cover pages to the Schedule 13D/A set forth (i) the number of shares of Class A common stock as to which there is sole power to vote or direct the vote or to dispose or direct the disposition and (ii) the number of shares of Class A common stock as to which there is shared power to vote or direct the vote or to dispose or direct the disposition.</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; TEXT-ALIGN: left; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">Paragraph (c) of Item 5 is hereby supplemented by adding the following paragraph:</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; TEXT-ALIGN: left; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 36pt">On July 28, 2017, IBG Holdings acquired 1,214,860 shares of Class A common stock in exchange for 1,214,860 membership interests owned by IBG Holdings in IBG LLC and certain tax benefit payments as described in the TRA. There were no other transactions in the Class A common stock by the Reporting Persons during the last sixty days.</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; TEXT-ALIGN: left; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">Paragraph (d) of Item 5 is hereby supplemented by adding the following paragraph:</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; TEXT-ALIGN: left; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 36pt">Mr. Paul J. Brody, Chief Financial Officer and Director of the Company, is among the members of IBG Holdings who have elected to redeem a portion of their IBG Holdings membership interests in connection with the July 28, 2017 transaction and therefore has an interest in the proceeds of sale of 340,000 shares of the Class A common stock to be sold pursuant to the 2017 Plans (defined in Item 6). Certain current and former employees of the Company and its subsidiaries also elected the redemption of a portion of their membership interests in IBG Holdings and therefore have an interest in the balance of the shares to be sold under the Plans.<font style="FONT-WEIGHT: bold; DISPLAY: inline">&#160;</font>Neither Mr. Thomas Peterffy nor his affiliates have elected to redeem any of their IBG Holdings membership interests and therefore have no interest in the proceeds of sale of the shares of Class A common stock acquired by IBG Holdings on July 28, 2017. Additionally, 1,086,200 of the shares of Class A common stock acquired on July 28, 2016 and enrolled in the 2016 Plans were not sold pursuant to such Plans. Messrs. Earl H. Nemser, Vice Chairman of the Board of the Company and Thomas A.J. Frank, Executive Vice President of the Company have an interest in the proceeds from the sale of 50,000 and 1,000,000 shares of Class A common stock, respectively, which were not sold under the 2016 Plans and have been included in the 2017 Plans &#8211; see discussion below under Item 6.</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; FONT-WEIGHT: bold; TEXT-ALIGN: left; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">Item 6. &#160;Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer.</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; TEXT-ALIGN: left; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">The first paragraph under subheading &#8220;Voting&#8221; of Item 6 is hereby amended and restated to read as follows:</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; TEXT-ALIGN: left; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 36pt">Pursuant to the Restated Charter, IBG Holdings, as the sole holder of the 100 outstanding shares of the Class B common stock, is entitled to the number of votes equal to the number of IBG LLC membership interests held by it at any given time. Except as otherwise provided by law and the Restated Charter, the Company&#8217;s shares of Class A common stock and Class B common stock vote together as a single class.&#160;As of the date of this statement, IBG Holdings holds 340,229,444 IBG LLC membership interests, and, as a result, the Class B common stock held by IBG Holdings represents approximately 82.6% of the voting power of the Company.&#160;Such percentage voting power is anticipated to decrease over time as a result of the exchange and redemption pursuant to the Exchange Agreement. Mr. Thomas Peterffy, through his revocable trust&#8217;s ownership of the voting membership interests in IBG Holdings, beneficially owns all of the outstanding shares of the Class B common stock which represent approximately 82.6% of the voting power of the Company.</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; TEXT-ALIGN: left; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">The following paragraphs are hereby added to Item 6 under the subheading &#8220;Voting&#8221;:</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; TEXT-ALIGN: left; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 36pt">On July 28, 2017, IBG Holdings acquired 1,214,860 shares of Class A common stock for sale for the benefit of certain of its members who elected to redeem a portion of their IBG Holdings membership interests. The shares of Class A common stock were acquired in exchange for 1,214,860 membership interests owned by IBG Holdings in IBG LLC and represent approximately 0.3% of the voting power of the Company. We anticipate a proportional reduction in the voting power of IBG Holdings as a result of these intended sales in open market transactions of such shares pursuant to the 2017 Plans. Additionally, 1,086,200 of the shares of Class A common stock acquired on July 28, 2016 and enrolled in the 2016 Plans were not sold pursuant to such Plans and are still owned by IBG Holdings. Mr. Thomas Peterffy, through his revocable trust&#8217;s ownership of the voting membership interests in IBG Holdings, beneficially owns such 2,301,060 shares of Class A common stock, which represent approximately 0.6% of the voting power of the Company.</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; TEXT-ALIGN: left; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 36pt">In the aggregate, IBG Holdings holds approximately 83.2% of the voting power of the Company. Mr. Thomas Peterffy, through his revocable trust&#8217;s ownership of the voting membership interests in IBG Holdings, holds in the aggregate approximately 83.2% of the total voting power of the Company.</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; TEXT-ALIGN: left; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">The following paragraph is hereby added to Item 6:</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; TEXT-ALIGN: left; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 36pt">On July 28, 2017, IBG Holdings entered into Rule 10b5-1 trading plans (the &#8220;<font style="TEXT-DECORATION: underline; DISPLAY: inline">2017 Plans</font>&#8221;) providing for the sale of<font style="FONT-SIZE: 10pt; DISPLAY: inline">&#160;</font>2,301,060 shares of Class A common stock in open market transactions, which includes the 1,214,860 shares acquired by IBG Holdings on July 28, 2017 and 1,086,200 shares that were not sold pursuant to the 2016 Plans. Under the terms of the 2017 Plans, IBG Holdings intends to sell the 2,301,060 shares of Class A common stock over time at prevailing market prices.&#160;Mr. Paul J. Brody, Chief Financial Officer and Director of the Company, has an interest in the proceeds of sale of 340,000 shares of the Class A common stock to be sold pursuant to the 2017 Plans. Messrs. Earl H. Nemser, Vice Chairman of the Board of the Company and Thomas A.J. Frank, Executive Vice President of the Company, have an interest in the proceeds from the sale of 50,000 and 1,000,000 shares of Class A common stock, respectively, which were not sold under the 2016 Plans and have been included in the 2017 Plans. The sales will occur until the earlier of the date on which all shares are sold, July 24, 2018 or the plans are terminated in accordance with their terms and Rule 10b5-1 of the Exchange Act and will be disclosed publicly in accordance with applicable securities laws, rules and regulations through appropriate filings with the Securities and Exchange Commission, as applicable. IBG Holdings and its members will have no control over the stock sales under the 2017 Plans.</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; TEXT-ALIGN: left; MARGIN-LEFT: 0pt; DISPLAY: block; MARGIN-RIGHT: 0pt; TEXT-INDENT: 36pt">After reasonable inquiry and to the best of its knowledge and belief, the undersigned certify that the information set forth in this Statement is true, complete and correct.</div>

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<td style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; WIDTH: 25%">&#160;Dated: August 1, 2017</td>
<td style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; WIDTH: 25%">&#160;IBG HOLDINGS LLC</td>
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<td style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; BORDER-BOTTOM: black 2px solid; WIDTH: 25%">&#160;/s/ Thomas Peterffy</td>
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<td style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; WIDTH: 25%">&#160;Name: Thomas Peterffy</td>
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<td style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; WIDTH: 25%">&#160;Title: Managing Member</td>
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<td style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; WIDTH: 25%">&#160;Dated: August 1, 2017</td>
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<td style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; BORDER-BOTTOM: black 2px solid; WIDTH: 25%">&#160;/s/ Thomas Peterffy</td>
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