Interactive Brokers Group, Inc. Class A Common Stock: tracked funds
IBKRfinancial statementsinsider trading
Across each manager’s latest 13F filing, mostly for Q2 2026, 2 of the 18 tracked managers held Interactive Brokers Group, Inc. Class A Common Stock; 1 opened a position, 1 added, none trimmed, none sold out. Largest: Baron Capital Group at 0.7% of its portfolio.
Filings through August 14, 2026. Each fund is measured on its own latest 13F; counted in funds, not dollars.
The trend
Q3 2023 to Q2 2026, each fund in the quarter its filing covers, so the newest quarter can trail the figures above while filings come in.
Each fund is placed in the quarter of its own filing. Above the lower line, funds that opened or added more than 1% of their shares; below, funds that trimmed more than 1% or sold out.
The funds
Every tracked fund with a position in its latest filing, largest weight first, and those that sold out. Bars show shares at each quarter end: green when it added, red when it sold.
| Fund | Manager | Quarter | Weight | × average | Value | Shares | Change | Move | Shares by quarter |
|---|---|---|---|---|---|---|---|---|---|
| Baron Capital Group | Ron Baron | Q2 2026 | 0.66% | 2.1× | $418M | 5M | +18.8% | added | |
| Lone Pine Capital | Steve Mandel | Q2 2026 | 0.39% | 0.1× | $50M | 577,666 | — | opened |
Questions
Which hedge funds own IBKR?
Across each manager's latest 13F filing (mostly Q2 2026), 2 of the 18 tracked managers held Interactive Brokers Group, Inc. Class A Common Stock: Baron Capital Group (0.7%), Lone Pine Capital (0.4%).
Did Baron Capital Group add or sell IBKR last quarter?
In its Q2 2026 13F, filed August 14, 2026, Baron Capital Group added to its position, shares 19% higher; IBKR was 0.7% of its reported portfolio.
What is a 13F and what does it miss?
Managers with $100 million or more in US equities report their long positions on Form 13F each quarter, up to 45 days after it ends. The filing omits short positions, bonds, cash and most foreign listings, and a position may have changed since the quarter ended. Options are excluded here.
From the managers’ Form 13F-HR filings with the SEC, amendments applied, share counts adjusted for splits; GOOG and GOOGL are one position. A record of filings, not a recommendation.