Interactive Brokers Group, Inc.
IBKRLast close · Oct 16, 202682.69−3.34 (−3.88%)
Market cap$145.3B
Of the 85 managers this site tracks, 8 held Interactive Brokers (IBKR) at the end of Q2 2026, their latest 13Fs. The largest position by value was Viking Global's, $420.5M; John Armitage's ($359.4M) and Bryan Lawrence's ($89.7M) follow. No Schedule 13D or 13G is on file for IBKR from the activists and large holders the site follows.
Superinvestors holding IBKR
| Manager | Firm | Quarter | Shares | Value |
|---|---|---|---|---|
| Viking Global | Viking Global Investors LP | Q2 2026 | 5M | $420.5M |
| John Armitage | Egerton Capital (UK) LLP | Q2 2026 | 4M | $359.4M |
| Bryan Lawrence | Oakcliff Capital Partners, LP | Q2 2026 | 1M | $89.7M |
| Stephen Mandel | Lone Pine Capital LLC | Q2 2026 | 577,666 | $50.3M |
| Robert Vinall | RV Capital AG | Q2 2026 | 561,086 | $48.8M |
| William Von Mueffling | Cantillon Capital Management LLC | Q2 2026 | 517,833 | $45.1M |
| Soros | Soros Fund Management LLC | Q2 2026 | 151,470 | $13.2M |
| Bridgewater | Bridgewater Associates, LP | Q2 2026 | 42,076 | $3.7M |
13D/13G are SEC beneficial-ownership disclosures, triggered only above 5%; a 13F is a quarterly snapshot filed up to 45 days after quarter end. Superinvestor names link to their full portfolios under Investors.