ValuationViz

IBKR fund manager activity

Interactive Brokers Group, Inc · Nasdaq. Reported by 15 tracked fund managers in their 13F filings, Q4 2013 to Q3 2026.

Q3 2026

ManagerActivitySharesValue% of portfolioFiled
John Armitage - Egerton CapitalTrimmed3,160,704$269,987,3362.75%Oct 20, 2026

Q2 2026

ManagerActivitySharesValue% of portfolioFiled
Ron Baron - Baron CapitalAdded4,807,214$418,419,9070.63%Aug 14, 2026
William Von Mueffling - Cantillon Capital ManagementTrimmed517,833$45,072,1846.78%Jul 29, 2026
John Armitage - Egerton CapitalTrimmed4,129,416$359,424,3693.47%Jul 21, 2026
Ken Fisher - Fisher Asset ManagementTrimmed7,387$643,0540.00%Aug 4, 2026
Jeremy Grantham - GMONew21,049$1,832,1050.00%Aug 13, 2026
Joel Greenblatt - Gotham Asset ManagementTrimmed109,329$9,515,9960.02%Aug 14, 2026
Stephen Mandel - Lone Pine CapitalNew577,666$50,280,0490.31%Aug 14, 2026
Bryan Lawrence - Oakcliff CapitalNo change1,030,740$89,715,61033.4%Aug 13, 2026
Robert Vinall - RV Capital GmbHTrimmed561,086$48,836,92512.8%Aug 14, 2026
Viking Global InvestorsAdded4,830,748$420,468,3061.20%Aug 14, 2026

Older quarters