Earl H. Nemser is Chairman at Interactive Brokers Group, Inc. (IBKR). They have made 36 open-market trades across 1 company since 2013, most recently 2026-07-31.
CIK 0001391400
Unrated. We grade insiders only on stock they chose to buy on the open market. Grants, option exercises and vesting say nothing about timing, so they don't count — which is why someone can file often and still have no grade. It isn't a bad sign: unrated buys beat every graded tier below A.
0 open-market purchases, against 36 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| IBKR | 803,568 | $66.4M |
Shares reported on the most recent Form 4, priced at the 2026-08-04 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| IBKR | SELL | 2026-01-26 | 2026-01-28 | $75.84 | $11.8M | +2.6% | -6.9% | +1.4% |
| IBKR | SELL | 2026-01-22 | 2026-01-26 | $77.43 | $19.0M | -7.9% | -2.3% | +2.9% |
| IBKR | SELL | 2025-08-14 | 2025-08-15 | $64.00 | $6.9M | -2.3% | -1.5% | +6.0% |
| IBKR | SELL | 2025-08-12 | 2025-08-14 | $67.48 | $16.4M | -0.8% | -2.4% | +13.9% |
| IBKR | SELL | 2025-08-08 | 2025-08-12 | $65.95 | $2.7M | -8.0% | -6.6% | +4.9% |
| IBKR | SELL | 2025-08-06 | 2025-08-08 | $63.64 | $2.4M | -6.2% | -8.3% | +4.9% |
| IBKR | SELL | 2025-08-04 | 2025-08-06 | $64.15 | $3.2M | -1.0% | -6.4% | +9.9% |
| IBKR | SELL | 2025-07-31 | 2025-08-04 | $65.27 | $3.3M | -1.7% | -1.7% | +12.4% |
| IBKR | SELL | 2025-07-30 | 2025-08-01 | $66.35 | $4.8M | -1.3% | -0.7% | +6.5% |
| IBKR | SELL | 2025-07-28 | 2025-07-30 | $65.90 | $7K | -0.6% | -6.5% | +3.1% |
| IBKR | SELL · 10b5-1 | 2024-02-21 | 2024-02-23 | $105.94 | $1.1M | +3.2% | +2.4% | +16.8% |
| IBKR | SELL | 2024-02-15 | 2024-02-20 | $104.58 | $2.1M | +5.8% | +5.3% | +20.2% |
| IBKR | SELL | 2024-02-13 | 2024-02-15 | $101.30 | $14.1M | +3.4% | +2.8% | +16.1% |
| IBKR | SELL | 2024-02-02 | 2024-02-06 | $96.14 | $19.2M | +12.1% | +17.1% | +30.8% |
| IBKR | SELL | 2020-10-02 | 2020-10-05 | $48.82 | $4.0M | +1.1% | -2.5% | +23.7% |
| IBKR | SELL | 2020-09-22 | 2020-09-24 | $48.57 | $1.9M | +7.7% | +3.8% | +30.9% |
| IBKR | SELL | 2020-09-17 | 2020-09-21 | $47.95 | $1.2M | +1.5% | +3.4% | +23.1% |
| IBKR | SELL | 2020-09-16 | 2020-09-17 | $47.71 | $1.9M | +1.2% | +3.8% | +22.5% |
| IBKR | SELL | 2020-09-11 | 2020-09-15 | $47.78 | $1.1M | +0.4% | +5.9% | +15.1% |
| IBKR | SELL | 2020-09-09 | 2020-09-11 | $48.37 | $479K | -0.8% | +8.4% | +18.0% |
| IBKR | SELL | 2020-09-04 | 2020-09-09 | $50.41 | $5.2M | +0.0% | +5.8% | +13.0% |
| IBKR | SELL | 2020-09-02 | 2020-09-04 | $53.12 | $8.2M | -7.0% | -3.3% | +6.7% |
| IBKR | SELL | 2020-08-31 | 2020-09-02 | $53.18 | $8.9M | -11.4% | -8.3% | +1.3% |
| IBKR | SELL | 2020-08-27 | 2020-08-31 | $53.14 | $35.2M | -10.4% | -8.6% | -0.2% |
| IBKR | SELL | 2020-08-26 | 2020-08-27 | $52.60 | $16.5M | -10.2% | -9.3% | -1.3% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.