Interactive Brokers Group
IBKR · NASDAQ
Who owns IBKR
Largest institutional holders, from their latest 13F filings
The 10 largest institutions hold 7.8% of IBKR’s shares.
- Vanguard Capital Management, LLC1.7%
- BlackRock Institutional Trust Company, N.A.1.3%
- State Street Investment Management (US)1.1%
- Fidelity Management & Research Company LLC0.7%
- Next 6 largest institutions3.0%
- All other shareholders92.2%
| Holder | Shares | % of shares |
|---|---|---|
| Vanguard Capital Management, LLC | 28.35M | 1.67% |
| BlackRock Institutional Trust Company, N.A. | 22.26M | 1.31% |
| State Street Investment Management (US) | 19.44M | 1.15% |
| Fidelity Management & Research Company LLC | 11.51M | 0.68% |
| Geode Capital Management, L.L.C. | 10.64M | 0.63% |
| Greenwich Wealth Management LLC | 9.92M | 0.58% |
| Vanguard Portfolio Management, LLC | 8.72M | 0.51% |
| Two Sigma Investments, LP | 8.36M | 0.49% |
| Wellington Management Company, LLP | 7.38M | 0.44% |
| Kayne Anderson Rudnick Investment Management, LLC | 6.37M | 0.38% |
Largest mutual fund holders
| Holder | Shares | % of shares |
|---|---|---|
| Vanguard Total Stock Market Index Fund | 13.48M | 0.79% |
| Vanguard 500 Index Fund | 11.70M | 0.69% |
| iShares Core S&P 500 ETF | 5.94M | 0.35% |
| Statens Pensjonsfond Utland | 5.79M | 0.34% |
| Fidelity 500 Index Fund | 5.76M | 0.34% |
Insider trades
Form 4 filings by officers, directors and large holders
Over the last 6 months, insiders bought $13.02K (6 trades) and sold $2.00M (1 trade) of IBKR on the open market.
| Insider | Type | Shares | Value |
|---|---|---|---|
| Conkling Lori A | Buy | 25 | $2.14K |
| Conkling Lori A | Buy | 25 | $2.36K |
| Conkling Lori A | Buy | 25 | $2.18K |
| Nemser Earl H | Award | 803.57K | $70.71M |
| Conkling Lori A | Buy | 25 | $2.20K |
| Conkling Lori A | Buy | 25 | $2.15K |
| Brody Paul Jonathan | Tax withholding | 82.92K | $7.00M |
| Mendonca Denis | Tax withholding | 11.16K | $941.87K |
| Galik Milan | Tax withholding | 255.04K | $21.53M |
| Frank Thomas AJ | Tax withholding | 31.73K | $2.68M |
Congressional trades
Disclosed by members of Congress over the last 12 months
| Member | Type | Amount | Traded |
|---|---|---|---|
| Ro KhannaHouse | Purchase | $1K–$15K | Apr 13, 2026 |
Short interest
Settled Sep 30, 2026
- Shares short
- 13.71M
- Days to cover
- 3.54
- % of shares outstanding
- 0.81%
- Average daily volume
- 3.87M
- Change since last report
- +10.6%
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