IBKR fund manager activity
Interactive Brokers Group, Inc · Nasdaq. Reported by 15 tracked fund managers in their 13F filings, Q4 2013 to Q3 2026.
Q1 2026
| Manager | Activity | Shares | Value | % of portfolio | Filed |
|---|
| Ron Baron - Baron Capital | Trimmed | 4,047,376 | $271,457,508 | 0.82% | May 15, 2026 |
| William Von Mueffling - Cantillon Capital Management | Trimmed | 11,245,881 | $754,261,239 | 5.01% | May 7, 2026 |
| John Armitage - Egerton Capital | Trimmed | 6,275,179 | $420,876,256 | 4.67% | May 13, 2026 |
| Ken Fisher - Fisher Asset Management | Trimmed | 7,429 | $498,337 | 0.00% | May 5, 2026 |
| Joel Greenblatt - Gotham Asset Management | Added | 114,822 | $7,701,112 | 0.02% | May 15, 2026 |
| Bryan Lawrence - Oakcliff Capital | No change | 1,030,740 | $69,131,732 | 30.5% | May 15, 2026 |
| Robert Vinall - RV Capital GmbH | Added | 757,919 | $51,111,227 | 13.4% | May 11, 2026 |
| Viking Global Investors | New | 1,394,329 | $93,517,646 | 0.26% | May 15, 2026 |
Q4 2025
| Manager | Activity | Shares | Value | % of portfolio | Filed |
|---|
| Ron Baron - Baron Capital | Added | 4,643,376 | $298,615,511 | 0.81% | Feb 17, 2026 |
| William Von Mueffling - Cantillon Capital Management | Added | 12,759,904 | $820,589,426 | 4.44% | Feb 11, 2026 |
| John Armitage - Egerton Capital | Added | 6,939,581 | $446,284,454 | 4.85% | Feb 11, 2026 |
| Ken Fisher - Fisher Asset Management | Added | 9,260 | $595,563 | 0.00% | Feb 9, 2026 |
| Joel Greenblatt - Gotham Asset Management | Trimmed | 113,009 | $7,267,609 | 0.03% | Feb 17, 2026 |
| Bryan Lawrence - Oakcliff Capital | No change | 1,030,740 | $66,286,889 | 28.4% | Feb 17, 2026 |
| Robert Vinall - RV Capital GmbH | Trimmed | 752,478 | $48,391,860 | 11.3% | Jan 30, 2026 |
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