Interactive Brokers IBKR Insider Ownership

NASDAQ IBKR
$88.30 +2.49 (+2.90%)
At close: Oct 2, 2026 · 4:00 PM EDT

Insider Holdings by Owner

20.35Mn Shares

Insider Ownership Statistics

as of 30 Sep, 2026
Insider Ownership
4.64%
▲+0.090% pp QoQ
Shares Held by Insiders
20.78Mn
filed for Sep 2026
▲+1.98% QoQ
Shares Outstanding
447.90Mn
447,903,860 shares
Direct Holdings
19.97Mn
Indirect: 810.50K
Net Shares Traded (QoQ)
+403.64K
net buying in Sep 2026
Insiders Holding Shares
15
with Form 4 holdings on file

Shares Owned by Insiders

Shares held % of outstanding
Latest —
Average ownership —
Peak ownership —

Shares Purchased/Sold by Insiders

Bought Sold
Latest quarter —
Net over range —
Buying quarters —

Insider Ownership Summary

Quarter ending 30 Sep, 2026

Over the past year, IBKR insiders bought $44,364 of stock (625 shares) and sold $36.49 million (481K shares) on the open market.

Form 4 Holdings

Insiders Holding IBKR

Insiders 15
Shares held 20.35Mn
Of outstanding 4.54%
# Insider Position Direct Indirect Total Share of Insiders Last Filed
1 Thomas Peterffy Chairman 12,836,332 0 12,836,332 63.1% 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 14.0% 28 May, 2026
4 Earl H Nemser Vice Chairman 0 803,568 803,568 3.9% 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 173,482 0 173,482 0.9% 29 Apr, 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 2,559 0 2,559 0.0% 02 Sep, 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

4,137 Insider Transactions

Source SEC Form 4
Latest quarter Sep 2026
Download Data
Date Insider Position Transaction Shares Price Value Shares Held After Ownership
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 Earl H Nemser Vice Chairman Disposed F 22,486 $84.42 $1.90Mn 429,344 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 Thomas Aj Frank Executive Vice President Disposed F 31,730 $84.42 $2.68Mn 251,518 Direct
08 May, 2026 Milan Galik Chief Executive Officer Disposed F 255,039 $84.42 $21.53Mn 3,215,389 Direct
08 May, 2026 Denis Mendonca Chief Accounting Officer Disposed F 11,157 $84.42 $941.87K 145,071 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
26 Jan, 2026 Earl H Nemser Vice Chairman Disposed S 3,101 $77.98 $241.82K 60,200 Indirect
27 Jan, 2026 Earl H Nemser Vice Chairman Disposed S 39,731 $75.07 $2.98Mn 20,469 Indirect
27 Jan, 2026 Earl H Nemser Vice Chairman Disposed S 20,469 $75.75 $1.55Mn 0 Indirect