Interactive Brokers Group Inc
Ownership
Ownership Structure
Who owns Interactive Brokers Group Inc (IBKR)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 96.8% of the shares are freely tradable; institutional investors hold 89.9%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 7.31 | 33,129,663 | +5.6 | 06/30/2026 |
| Vanguard Capital Management, LLC | 6.26 | 28,349,920 | +0.6 | 06/30/2026 |
| State Street Corp | 4.29 | 19,437,767 | +1.8 | 06/30/2026 |
| FMR Inc | 2.61 | 11,828,151 | -5.4 | 06/30/2026 |
| Geode Capital Management, LLC | 2.35 | 10,641,906 | +1.9 | 06/30/2026 |
| Greenwich Wealth Management LLC | 2.19 | 9,921,755 | +0.0 | 06/30/2026 |
| Amvescap Plc. | 2.14 | 9,708,980 | +0.6 | 06/30/2026 |
| Vanguard Portfolio Management, LLC | 1.93 | 8,724,292 | -41.8 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard MStar Total Stk Mkt Idx Invest | 3.02 | 13,661,890 | +1.6 | 09/30/2026 |
| Vanguard 500 Index Investor | 2.63 | 11,899,648 | +0.5 | 09/30/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Nemser Earl H | Vice Chairman | 803,568 | 61,794,379 $ | Jul 31, 2026 | indirect |
| Harris Lawrence E | Director | 148,482 | 11,418,266 $ | Oct 28, 2026 | direct |
| Conkling Lori A | Director | 2,584 | 198,710 $ | Oct 1, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Oct 28, 2026 | Harris Lawrence E | Director | Sell | 25,000 | 82.61 | 2,065,250 |
| Oct 1, 2026 | Conkling Lori A | Director | Buy | 25 | 85.42 | 2,136 |
| Sep 1, 2026 | Conkling Lori A | Director | Buy | 25 | 94.53 | 2,363 |
| Aug 3, 2026 | Conkling Lori A | Director | Buy | 25 | 87.03 | 2,176 |
| Jul 31, 2026 | Nemser Earl H | Vice Chairman | Other | 803,568 | 87.99 | 70,705,948 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: October 30, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.