Interactive Brokers IBKR Insider Ownership

NASDAQ IBKR

$81.79 +0.46 (+0.57%)

At close: Nov 13, 2026 · 4:00 PM EST

Insider Holdings by Owner

20.32Mn Shares

Thomas Peterffy12.84Mn63.2%

Milan Galik3.22Mn15.8%

Paul Jonathan Brody2.86Mn14.1%

Earl H Nemser803.57K4.0%

Thomas Aj Frank251.52K1.2%

Other insiders (10)357.29K1.8%

Insider Ownership Statistics

as of 30 Sep, 2026

Insider Ownership

3.10%

▲+0.178% pp QoQ

Shares Held by Insiders

13.98Mn

filed for Sep 2026

▲+6.10% QoQ

Shares Outstanding

450.57Mn

450,572,183 shares

Direct Holdings

13.17Mn

Indirect: 810.50K

Net Open-Market Trades

+75

net bought · $6.74K in Sep 2026

Insiders Holding Shares

with Form 4 holdings on file

Shares Owned by Insiders

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Open-Market Insider Trades

Bought Sold

Latest quarter —

Net over range —

Net-buying quarters —

Insider Ownership Summary

Updated Nov 4, 2026

Over the past year, IBKR insiders bought $22,080 of stock (275 shares) and sold $34.79 million (451K shares) on the open market.

Behind Interactive Brokers' open-market trades in the past 12 months were one insider buying and 2 insiders selling.
Among Interactive Brokers insiders, Lori A. Conkling (Director) led open-market buying over the past 12 months with $22,080 of purchases (275 shares); the latest was on November 2, 2026.
On the sell side, Earl H. Nemser (Vice Chairman) led open-market sales of Interactive Brokers stock over the past 12 months with $30.73 million (400K shares), most recently on January 27, 2026.
Away from the open market, IBKR insiders received 1.13Mn shares in stock awards and gave up 403.33K shares to cover taxes or exercise prices over the last 12 months.
Business Quant data shows Interactive Brokers insiders holding 13.96Mn shares in total in their latest Form 4 filings, up 5.91% from 13.18Mn shares at the end of Q2 2026 and down 4.62% from 14.63Mn shares at the end of Q3 2025.
By type of ownership, IBKR insiders hold 94.19% of their shares directly (13.15Mn shares) and 5.81% indirectly (810.5K shares).
Holdings in Interactive Brokers stock are reported by 12 insiders, the officers, directors and 10% owners who have filed a Form 4 in the past two years.
IBKR's three largest insider shareholders, per their latest Form 4 filings, are Thomas Peterffy (Chairman, 6.06Mn shares), Milan Galik (Chief Executive Officer, 3.22Mn shares) and Paul Jonathan Brody (Chief Financial Officer, 2.86Mn shares).
Thomas Peterffy alone accounts for 43.45% of the shares held by Interactive Brokers insiders.
Institutions held 86.02% of Interactive Brokers' outstanding shares in their Q2 2026 13F filings, insiders about 3.10% based on their latest Form 4 filings, and other investors, including the public, the remaining 10.88%.
A total of 40 Form 4 filings with transactions in Interactive Brokers stock were made over the past 12 months, by 11 insiders.
Insider figures for IBKR include Form 4 filings through November 3, 2026.

Form 4 Holdings

Insiders Holding IBKR

Insiders 15

Shares held 20.32Mn

Of outstanding 4.51%

#	Insider	Position	Direct	Indirect	Total	Share of Insiders	Last Filed
1	Thomas Peterffy	Chairman	12,836,332	0	12,836,332	63.2%	24 Feb, 2025
2	Milan Galik	Chief Executive Officer	3,215,389	0	3,215,389	15.8%	28 May, 2026
3	Paul Jonathan Brody	Chief Financial Officer	2,856,806	0	2,856,806	14.1%	28 May, 2026
4	Earl H Nemser	Vice Chairman	0	803,568	803,568	4.0%	04 Aug, 2026
5	Thomas Aj Frank	Executive Vice President	251,518	0	251,518	1.2%	28 May, 2026
6	Lawrence E Harris	Director	148,482	0	148,482	0.7%	29 Oct, 2026
7	Denis Mendonca	Chief Accounting Officer	145,071	0	145,071	0.7%	28 May, 2026
8	Jill Bright	Director	11,082	0	11,082	0.1%	26 Jan, 2026
9	Philip Uhde	Director	10,288	0	10,288	0.1%	09 Jan, 2024
10	William Peterffy	Director	10,126	0	10,126	0.0%	26 Jan, 2026
11	Nicole Yuen	Director	10,126	0	10,126	0.0%	26 Jan, 2026
12	John M. Damgard	Director	8,752	0	8,752	0.0%	06 Jan, 2022
13	Gary Katz	Director	7,712	0	7,712	0.0%	06 Jan, 2023
14	Richard H Repetto	Director	3,046	0	3,046	0.0%	26 Jan, 2026
15	Lori A Conkling	Director	2,609	0	2,609	0.0%	03 Nov, 2026

Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.

Form 4 Filings

4,140 Insider Transactions

Source SEC Form 4

Latest quarter Sep 2026

Date	Insider	Position	Transaction	Shares	Price	Value	Shares Held After	Ownership
02 Nov, 2026	Lori A Conkling	Director	Acquired P	25	$78.44	$1.96K	2,609	Direct
28 Oct, 2026	Lawrence E Harris	Director	Disposed S	25,000	$82.61	$2.07Mn	148,482	Direct
01 Oct, 2026	Lori A Conkling	Director	Acquired P	25	$85.42	$2.14K	2,584	Direct
01 Sep, 2026	Lori A Conkling	Director	Acquired P	25	$94.53	$2.36K	2,559	Direct
03 Aug, 2026	Lori A Conkling	Director	Acquired P	25	$87.03	$2.18K	2,534	Direct
31 Jul, 2026	Earl H Nemser	Vice Chairman	Acquired A	803,568	$87.99	$70.71Mn	803,568	Indirect
01 Jul, 2026	Lori A Conkling	Director	Acquired P	25	$88.03	$2.20K	2,509	Direct
01 Jun, 2026	Lori A Conkling	Director	Acquired P	25	$86.10	$2.15K	2,484	Direct
08 May, 2026	Thomas Aj Frank	Executive Vice President	Disposed F	31,730	$84.42	$2.68Mn	251,518	Direct
08 May, 2026	Denis Mendonca	Chief Accounting Officer	Disposed F	11,157	$84.42	$941.87K	145,071	Direct
08 May, 2026	Milan Galik	Chief Executive Officer	Disposed F	255,039	$84.42	$21.53Mn	3,215,389	Direct
08 May, 2026	Paul Jonathan Brody	Chief Financial Officer	Disposed F	82,920	$84.42	$7.00Mn	2,856,806	Direct
08 May, 2026	Earl H Nemser	Vice Chairman	Disposed F	22,486	$84.42	$1.90Mn	429,344	Direct
01 May, 2026	Lori A Conkling	Director	Acquired P	25	$79.64	$1.99K	2,459	Direct
28 Apr, 2026	Lawrence E Harris	Director	Disposed S	26,000	$76.93	$2.00Mn	173,482	Direct
01 Apr, 2026	Lori A Conkling	Director	Acquired P	25	$68.38	$1.71K	2,434	Direct
25 Feb, 2026	Lori A Conkling	Director	Acquired P	50	$73.21	$3.66K	2,384	Direct
02 Mar, 2026	Lori A Conkling	Director	Acquired P	25	$69.21	$1.73K	2,409	Direct
26 Jan, 2026	Earl H Nemser	Vice Chairman	Disposed S	60,882	$75.83	$4.62Mn	94,118	Indirect
26 Jan, 2026	Earl H Nemser	Vice Chairman	Disposed S	30,817	$76.72	$2.36Mn	63,301	Indirect

Showing 1 to 20 of 4,140 transactions