Interactive Brokers Group, Inc. (IBKR) ownership: Top institutional holder: VANGUARD GROUP INC ($3.36B). Insider activity: Neutral (5 buys, 5 sells). 6 recent congressional STOCK Act disclosures. SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| VANGUARD GROUP INC | 52254357.00 | $3.36B | 2025-12-31 |
| BlackRock, Inc. | 31375037.00 | $2.10B | 2026-03-31 |
| VANGUARD CAPITAL MANAGEMENT LLC | 28180361.00 | $1.89B | 2026-03-31 |
| STATE STREET CORP | 19092105.00 | $1.28B | 2026-03-31 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 14984545.00 | $1.01B | 2026-03-31 |
| FMR LLC | 12501284.00 | $838.46M | 2026-03-31 |
| Cantillon Capital Management LLC | 11245881.00 | $754.26M | 2026-03-31 |
| GEODE CAPITAL MANAGEMENT, LLC | 10443607.00 | $699.50M | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Buy | null | 2026-05-08 | |
| Buy | null | 2026-05-08 | |
| Buy | null | 2026-05-08 | |
| Buy | null | 2026-05-08 | |
| Buy | null | 2026-05-08 | |
| Sell | null | 2026-05-01 | |
| Sell | null | 2026-04-28 | |
| Sell | null | 2026-04-01 |
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Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.