Interactive Brokers's three largest insider shareholders as of March 23, 2026 are Milan Galik (Chief Executive Officer, 3.47Mn shares), Paul Jonathan Brody (Chief Financial Officer, 2.94Mn shares), Thomas Peterffy (Chairman, 1.52Mn shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Milan Galik | Chief Executive Officer | 3,470,428 | 0 | 26 Jan, 2026 |
| Paul Jonathan Brody | Chief Financial Officer | 2,939,726 | 0 | 26 Jan, 2026 |
| Thomas Peterffy | Chairman | 1,516,182 | 0 | 24 Feb, 2025 |
| Earl H Nemser | Vice Chairman | 451,830 | 0 | 26 Jan, 2026 |
| Thomas Aj Frank | Executive Vice President | 283,248 | 0 | 07 Jan, 2026 |
| Lawrence E Harris | 199,482 | 0 | 26 Jan, 2026 | |
| Denis Mendonca | Chief Accounting Officer | 156,228 | 0 | 07 Jan, 2026 |
| Jill Bright | 11,082 | 0 | 26 Jan, 2026 | |
| Nicole Yuen | 10,126 | 0 | 26 Jan, 2026 | |
| William Peterffy | 10,126 | 0 | 26 Jan, 2026 | |
| Paul Jonathan Brody | Chief Financial Officer | 0 | 6,928 | 01 Oct, 2025 |
| Richard H Repetto | 3,046 | 0 | 26 Jan, 2026 | |
| Philip Uhde | 2,572 | 0 | 09 Jan, 2024 | |
| Lori A Conkling | 2,334 | 0 | 26 Jan, 2026 | |
| John M. Damgard | 2,188 | 0 | 06 Jan, 2022 | |
| Gary Katz | 1,928 | 0 | 06 Jan, 2023 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 26 Jan, 2026 | Earl H Nemser | Class A common stock | D | 60,882 | $75.83 | 94,118 | I | S |
| 26 Jan, 2026 | Earl H Nemser | Class A common stock | D | 30,817 | $76.72 | 63,301 | I | S |
| 26 Jan, 2026 | Earl H Nemser | Class A common stock | D | 3,101 | $77.98 | 60,200 | I | S |
| 27 Jan, 2026 | Earl H Nemser | Class A common stock | D | 39,731 | $75.07 | 20,469 | I | S |
| 27 Jan, 2026 | Earl H Nemser | Class A common stock | D | 20,469 | $75.75 | 0 | I | S |
| 01 Jan, 2026 | Milan Galik | Class A common stock | A | 389 | $64.31 | 3,470,428 | D | A |
| 22 Jan, 2026 | Earl H Nemser | Class A common stock | D | 100,000 | $76.81 | 300,000 | I | S |
| 01 Jan, 2026 | Earl H Nemser | Class A common stock | A | 389 | $64.31 | 451,830 | D | A |
| 01 Jan, 2026 | Lawrence E Harris | Class A common stock | A | 389 | $64.31 | 199,482 | D | A |
| 01 Jan, 2026 | Paul Jonathan Brody | Class A common stock | A | 389 | $64.31 | 2,939,726 | D | A |
| 01 Jan, 2026 | Jill Bright | Class A common stock | A | 389 | $64.31 | 11,082 | D | A |
| 31 Dec, 2025 | Lori A Conkling | Class A common stock | A | 389 | $0.00 | 1,945 | D | A |
| 01 Jan, 2026 | Nicole Yuen | Class A common stock | A | 389 | $64.31 | 10,126 | D | A |
| 01 Jan, 2026 | Richard H Repetto | Class A common stock | A | 389 | $64.31 | 3,046 | D | A |
| 01 Jan, 2026 | William Peterffy | Class A common stock | A | 389 | $64.31 | 10,126 | D | A |
| 23 Jan, 2026 | Earl H Nemser | Class A common stock | D | 84,935 | $77.65 | 215,065 | I | S |
| 01 Jan, 2026 | Lori A Conkling | Class A common stock | A | 389 | $64.31 | 2,334 | D | A |
| 23 Jan, 2026 | Earl H Nemser | Class A common stock | D | 60,065 | $78.14 | 155,000 | I | S |
| 31 Dec, 2025 | Earl H Nemser | Class A common stock | A | 23,240 | $0.00 | 451,052 | D | A |
| 31 Dec, 2025 | Thomas Aj Frank | Class A common stock | A | 13,944 | $0.00 | 283,248 | D | A |