IBKR · Insider Trading
Interactive Brokers Group, Inc. Class A Common Stock
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.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-10-05 | Lori A Conkling | Director | Buy | +25 | +$2.14K |
| 2026-09-02 | Lori A Conkling | Director | Buy | +25 | +$2.36K |
| 2026-08-04 | Lori A Conkling | Director | Buy | +25 | +$2.18K |
| 2026-08-04 | Earl H Nemser | Vice Chairman | A | +803,568 | +$70.71M |
| 2026-07-01 | Lori A Conkling | Director | Buy | +25 | +$2.20K |
| 2026-06-02 | Lori A Conkling | Director | Buy | +25 | +$2.15K |
| 2026-05-28 | Earl H Nemser | Vice Chairman | F | −22,486 | −$1.90M |
| 2026-05-28 | Thomas AJ Frank | Executive Vice President | F | −31,730 | −$2.68M |
| 2026-05-28 | Milan Galik | Chief Executive Officer | F | −255,039 | −$21.53M |
| 2026-05-28 | Denis Mendonca | Chief Accounting Officer | F | −11,157 | −$941.87K |
| 2026-05-28 | Paul Jonathan Brody | Chief Financial Officer | F | −82,920 | −$7.00M |
| 2026-05-04 | Lori A Conkling | Director | Buy | +25 | +$1.99K |
| 2026-04-29 | Lawrence E Harris | Director | Sell | −26,000 | −$2.00M |
| 2026-04-02 | Lori A Conkling | Director | Buy | +25 | +$1.71K |
| 2026-03-26 | Lori A Conkling | Director | Buy | +75 | +$5.39K |
| 2026-01-28 | Earl H Nemser | Vice Chairman | Sell | −155,000 | −$11.76M |
| 2026-01-26 | Richard H Repetto | Director | A | +389 | +$25.02K |
| 2026-01-26 | Nicole Yuen | Director | A | +389 | +$25.02K |
| 2026-01-26 | Jill Bright | Director | A | +389 | +$25.02K |
| 2026-01-26 | Lori A Conkling | Director | A | +778 | +$25.02K |
| 2026-01-26 | Lawrence E Harris | Director | A | +389 | +$25.02K |
| 2026-01-26 | Milan Galik | Chief Executive Officer | A | +389 | +$25.02K |
| 2026-01-26 | Paul Jonathan Brody | Chief Financial Officer | A | +389 | +$25.02K |
| 2026-01-26 | Earl H Nemser | Vice Chairman | A | +389 | +$25.02K |
| 2026-01-26 | William Peterffy | Director | A | +389 | +$25.02K |
| 2026-01-26 | Earl H Nemser | Vice Chairman | Sell | −245,000 | −$18.97M |
| 2026-01-07 | William Peterffy | Director | A | +389 | +$25.02K |
| 2026-01-07 | Nicole Yuen | Director | A | +389 | +$25.02K |
| 2026-01-07 | Lori A Conkling | Director | A | +1,556 | +$25.02K |
| 2026-01-07 | Denis Mendonca | Chief Accounting Officer | A | +11,156 | — |
| 2026-01-07 | Thomas AJ Frank | Executive Vice President | A | +13,944 | — |
| 2026-01-07 | Earl H Nemser | Vice Chairman | A | +23,629 | +$25.02K |
| 2026-01-07 | Milan Galik | Chief Executive Officer | A | +225,039 | +$25.02K |
| 2026-01-07 | Richard H Repetto | Director | A | +389 | +$25.02K |
| 2026-01-07 | Jill Bright | Director | A | +389 | +$25.02K |
| 2026-01-07 | Lawrence E Harris | Director | A | +389 | +$25.02K |
| 2026-01-07 | Paul Jonathan Brody | Chief Financial Officer | A | +53,841 | +$25.02K |
| 2025-12-30 | Milan Galik | Chief Executive Officer | J | −895,688 | — |
| 2025-10-31 | Lawrence E Harris | Director | Sell | −10,645 | −$734.50K |
| 2025-10-29 | Lawrence E Harris | Director | Sell | −14,355 | −$997.00K |
| 2025-10-27 | Lawrence E Harris | Director | Sell | −30,000 | −$2.04M |
| 2025-10-27 | Jill Bright | Director | Buy | +400 | +$26.38K |
| 2025-10-03 | Paul Jonathan Brody | Chief Financial Officer | Sell | −6,928 | −$447.96K |
| 2025-10-01 | Paul Jonathan Brody | Chief Financial Officer | Sell | −21,361 | −$1.45M |
| 2025-09-29 | Paul Jonathan Brody | Chief Financial Officer | Sell | −31,354 | −$2.05M |
| 2025-09-25 | Paul Jonathan Brody | Chief Financial Officer | Sell | −33,416 | −$2.17M |
| 2025-09-23 | Paul Jonathan Brody | Chief Financial Officer | Sell | −65,895 | −$4.25M |
| 2025-09-19 | Paul Jonathan Brody | Chief Financial Officer | Sell | −223,382 | −$14.19M |
| 2025-09-17 | Paul Jonathan Brody | Chief Financial Officer | Sell | −195,482 | −$12.25M |
| 2025-09-15 | Paul Jonathan Brody | Chief Financial Officer | Sell | −209,783 | −$13.35M |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| Thomas Peterffy | Chairman | 6,064,728 | $501.49M |
| Thomas AJ Frank | Executive Vice President | 3,513,350 | $290.52M |
| Milan Galik | Chief Executive Officer | 3,215,389 | $265.88M |
| Paul Jonathan Brody | Chief Financial Officer | 2,958,279 | $244.62M |
| Earl H Nemser | Vice Chairman | 1,232,912 | $101.95M |
| Lawrence E Harris | Director | 173,482 | $14.35M |
| Denis Mendonca | Chief Accounting Officer | 145,071 | $12.00M |
| Jill Bright | Director | 11,082 | $916.37K |
| William Peterffy | Director | 10,126 | $837.32K |
| Nicole Yuen | Director | 10,126 | $837.32K |
| Richard H Repetto | Director | 3,046 | $251.87K |
| Lori A Conkling | Director | 2,584 | $213.67K |
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.
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.