IBKR (Interactive Brokers Group, Inc. Class A Common Stock)
Insider Trading Activity
Every open-market purchase and sale reported by IBKR officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.
Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-08-04 | Lori A Conkling | Director | Buy | — | — |
| 2026-08-04 | Earl H Nemser | Vice Chairman | A | — | — |
| 2026-07-01 | Lori A Conkling | Director | Buy | — | — |
| 2026-06-02 | Lori A Conkling | Director | Buy | — | — |
| 2026-05-28 | Earl H Nemser | Vice Chairman | F | — | — |
| 2026-05-28 | Thomas AJ Frank | Executive Vice President | F | — | — |
| 2026-05-28 | Milan Galik | Chief Executive Officer | F | — | — |
| 2026-05-28 | Denis Mendonca | Chief Accounting Officer | F | — | — |
| 2026-05-28 | Paul Jonathan Brody | Chief Financial Officer | F | — | — |
| 2026-05-04 | Lori A Conkling | Director | Buy | — | — |
| 2026-04-29 | Lawrence E Harris | Director | Sell | — | — |
| 2026-04-02 | Lori A Conkling | Director | Buy | — | — |
| 2026-03-26 | Lori A Conkling | Director | Buy | — | — |
| 2026-01-28 | Earl H Nemser | Vice Chairman | Sell | — | — |
| 2026-01-26 | Richard H Repetto | Director | A | — | — |
| 2026-01-26 | Nicole Yuen | Director | A | — | — |
| 2026-01-26 | Jill Bright | Director | A | — | — |
| 2026-01-26 | Lori A Conkling | Director | A | — | — |
| 2026-01-26 | Lawrence E Harris | Director | A | — | — |
| 2026-01-26 | Milan Galik | Chief Executive Officer | A | — | — |
| 2026-01-26 | Paul Jonathan Brody | Chief Financial Officer | A | — | — |
| 2026-01-26 | Earl H Nemser | Vice Chairman | A | — | — |
| 2026-01-26 | William Peterffy | Director | A | — | — |
| 2026-01-26 | Earl H Nemser | Vice Chairman | Sell | — | — |
| 2026-01-07 | William Peterffy | Director | A | — | — |
| 2026-01-07 | Nicole Yuen | Director | A | — | — |
| 2026-01-07 | Lori A Conkling | Director | A | — | — |
| 2026-01-07 | Denis Mendonca | Chief Accounting Officer | A | — | — |
| 2026-01-07 | Thomas AJ Frank | Executive Vice President | A | — | — |
| 2026-01-07 | Earl H Nemser | Vice Chairman | A | — | — |
| 2026-01-07 | Milan Galik | Chief Executive Officer | A | — | — |
| 2026-01-07 | Richard H Repetto | Director | A | — | — |
| 2026-01-07 | Jill Bright | Director | A | — | — |
| 2026-01-07 | Lawrence E Harris | Director | A | — | — |
| 2026-01-07 | Paul Jonathan Brody | Chief Financial Officer | A | — | — |
| 2025-12-30 | Milan Galik | Chief Executive Officer | J | — | — |
| 2025-10-31 | Lawrence E Harris | Director | Sell | — | — |
| 2025-10-29 | Lawrence E Harris | Director | Sell | — | — |
| 2025-10-27 | Lawrence E Harris | Director | Sell | — | — |
| 2025-10-27 | Jill Bright | Director | Buy | — | — |
| 2025-10-03 | Paul Jonathan Brody | Chief Financial Officer | Sell | — | — |
| 2025-10-01 | Paul Jonathan Brody | Chief Financial Officer | Sell | — | — |
| 2025-09-29 | Paul Jonathan Brody | Chief Financial Officer | Sell | — | — |
| 2025-09-25 | Paul Jonathan Brody | Chief Financial Officer | Sell | — | — |
| 2025-09-23 | Paul Jonathan Brody | Chief Financial Officer | Sell | — | — |
| 2025-09-19 | Paul Jonathan Brody | Chief Financial Officer | Sell | — | — |
| 2025-09-17 | Paul Jonathan Brody | Chief Financial Officer | Sell | — | — |
| 2025-09-15 | Paul Jonathan Brody | Chief Financial Officer | Sell | — | — |
| 2025-09-11 | Paul Jonathan Brody | Chief Financial Officer | Sell | — | — |
| 2025-08-15 | Earl H Nemser | Vice Chairman | Sell | — | — |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| — | — | 8,975,368 | — |
| — | — | 8,589,132 | — |
| — | Chairman | 6,064,728 | — |
| — | — | 5,832,844 | — |
| — | 10%+ Owner | 5,695,756 | — |
| — | 10%+ Owner | 5,581,840 | — |
| — | — | 4,699,016 | — |
| — | Executive Vice President | 3,513,350 | — |
| — | Chief Executive Officer | 3,215,389 | — |
| — | Chief Financial Officer | 2,958,279 | — |
| — | Vice Chairman | 1,232,912 | — |
| — | Director | 435,376 | — |
| — | Director | 173,482 | — |
| — | Chief Accounting Officer | 145,071 | — |
| — | Director | 58,332 | — |
| — | Director | 20,000 | — |
| — | 10%+ Owner | 16,932 | — |
| — | Director | 11,082 | — |
| — | Director | 10,292 | — |
| — | Director | 10,288 | — |
| — | Director | 10,126 | — |
| — | Director | 10,126 | — |
| — | Director | 8,752 | — |
| — | Director | 7,712 | — |
| — | Director | 3,046 | — |
Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.
Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.
Full filing history and per-insider positions are on the IBKR quote page; the site-wide leaderboard is on the insider transactions hub.