Who owns Interactive Brokers Gro-Cl A (IBKR)?
365 US mutual funds and ETFs from 175 fund families reported a position in IBKR for the quarter ending 2026-06-30. Against their own report a quarter earlier, 99 raised shares, 27 opened a new position, 165 cut and 28 sold out.
Largest fund families
| Fund family | Funds | Share of fund-held shares |
|---|---|---|
| Vanguard Index Funds | 5 | 40.5% |
| Ishares Trust | 16 | 13.9% |
| Fidelity Magellan Fund | 2 | 7.0% |
| Select Sector Spdr Trust | 1 | 4.0% |
| Vanguard Institutional Index Funds | 2 | 3.5% |
| Baron Select Funds | 1 | 3.3% |
Tracked managers holding IBKR
| Investor | Book weight |
|---|---|
| Egerton | 3.5% |
| Hosking | 3.1% |
Source: SEC Form N-PORT, which funds file about 60 days after quarter end, and the latest 13F filings. Share counts, not trades: a change can reflect fund inflows or outflows rather than a decision about IBKR. A record of holdings, not a forecast and not investment advice. See all owner pages or the forecast board for the names our model ranks.
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