As of August 04, 2026, Interactive Brokers's top three insider holders are Milan Galik (Chief Executive Officer, 3.47Mn shares), Paul Jonathan Brody (Chief Financial Officer, 2.94Mn shares), Thomas Peterffy (Chairman, 1.69Mn shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Milan Galik | Chief Executive Officer | 3,470,428 | 0 | 3,470,428 | 32.3% | 26 Jan, 2026 |
| 2 | Thomas Peterffy | Chairman | 3,209,083 | 0 | 3,209,083 | 29.9% | 24 Feb, 2025 |
| 3 | Paul Jonathan Brody | Chief Financial Officer | 2,939,726 | 0 | 2,939,726 | 27.3% | 26 Jan, 2026 |
| 4 | Earl H Nemser | Vice Chairman | 451,830 | 0 | 451,830 | 4.2% | 26 Jan, 2026 |
| 5 | Thomas Aj Frank | Executive Vice President | 283,248 | 0 | 283,248 | 2.6% | 07 Jan, 2026 |
| 6 | Lawrence E Harris | Director | 199,482 | 0 | 199,482 | 1.9% | 26 Jan, 2026 |
| 7 | Denis Mendonca | Chief Accounting Officer | 156,228 | 0 | 156,228 | 1.5% | 07 Jan, 2026 |
| 8 | Jill Bright | Director | 11,082 | 0 | 11,082 | 0.1% | 26 Jan, 2026 |
| 9 | William Peterffy | Director | 10,126 | 0 | 10,126 | 0.1% | 26 Jan, 2026 |
| 10 | Nicole Yuen | Director | 10,126 | 0 | 10,126 | 0.1% | 26 Jan, 2026 |
| 11 | Philip Uhde | Director | 2,572 | 0 | 2,572 | 0.0% | 09 Jan, 2024 |
| 12 | Lori A Conkling | Director | 2,434 | 0 | 2,434 | 0.0% | 02 Apr, 2026 |
| 13 | John M. Damgard | Director | 2,188 | 0 | 2,188 | 0.0% | 06 Jan, 2022 |
| 14 | Gary Katz | Director | 1,928 | 0 | 1,928 | 0.0% | 06 Jan, 2023 |
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.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 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 | 60,882 | $75.83 | $4.62Mn | 94,118 | Indirect |
| 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 | 30,817 | $76.72 | $2.36Mn | 63,301 | 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 |
| 26 Jan, 2026 | Earl H Nemser | Vice Chairman | Disposed S | 3,101 | $77.98 | $241.82K | 60,200 | 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 | 39,731 | $75.07 | $2.98Mn | 20,469 | 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 |
| 27 Jan, 2026 | Earl H Nemser | Vice Chairman | Disposed S | 20,469 | $75.75 | $1.55Mn | 0 | Indirect |
| 27 Jan, 2026 | Earl H Nemser | Vice Chairman | Disposed S | 20,469 | $75.75 | $1.55Mn | 0 | Indirect |
| 01 Jan, 2026 | Nicole Yuen | Director | Acquired A | 389 | $64.31 | $25.02K | 10,126 | Direct |
| 01 Jan, 2026 | Earl H Nemser | Vice Chairman | Acquired A | 389 | $64.31 | $25.02K | 451,830 | Direct |