INTERACTIVE BROKERS GRO-CL A (IBKR) Stock Institutional Trading Activity


INTERACTIVE BROKERS GRO-CL A (IBKR) position changes reported by tracked institutional filers across multiple SEC 13F reporting periods. Based on recent SEC 13F filings (Q4 2025), investors with some of the largest reported share count changes include Renaissance Technologies LLC, Cantillon Capital Management, Egerton Capital UK, Bares Capital Management, and Sequoia Financial Advisors. Explore insights into buying and selling patterns, position changes, and investment conviction levels to understand institutional trading behavior and market dynamics.

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Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q3 2024Renaissance Technologies LLCBuy217,400379,000$52,817,440
Q3 2024Ancient Art (Teton Capital)Sell-68,810456,364$63,598,887
Q3 2024Cantillon Capital ManagementSell-100,9323,377,643$470,708,328
Q3 2024Egerton Capital UKBuy249,1433,382,513$471,387,012
Q3 2024Bares Capital ManagementSell-1,416,1411,116,524$155,598,785
Q2 2024Renaissance Technologies LLCSell-236,900161,600$19,812,160
Q2 2024Ancient Art (Teton Capital)Sell-25,000525,174$64,386,332
Q2 2024Egerton Capital UKBuy309,6733,133,370$384,151,162
Q2 2024Cantillon Capital ManagementSell-177,1293,478,575$426,473,295
Q2 2024Bares Capital ManagementSell-277,4662,532,665$310,504,729
Q1 2024Renaissance Technologies LLCBuy247,800398,500$44,516
Q1 2024Oakcliff Capital PartnersSell-37,000302,647$33,808,696
Q1 2024Egerton Capital UKBuy2,823,6972,823,697$315,435,192
Q1 2024Cantillon Capital ManagementSell-73,1653,655,704$408,378,694
Q1 2024Bares Capital ManagementBuy264,5432,810,131$313,919,734
Q4 2023Renaissance Technologies LLCSell-16,400150,700$12,493
Q4 2023RV CapitalBuy21,200309,947$25,694,606
Q4 2023Cantillon Capital ManagementSell-90,7603,728,869$309,123,240
Q4 2023Bares Capital ManagementSell-20,8072,545,588$211,029,245
Q3 2023Renaissance Technologies LLCSell-81,600167,100$14,464
Q3 2023Ancient Art (Teton Capital)Sell-28,204550,174$47,623,061
Q3 2023Cantillon Capital ManagementSell-14,8393,819,629$330,627,086
Q3 2023Bares Capital ManagementSell-4,9042,566,395$222,147,151
Q2 2023Renaissance Technologies LLCBuy36,300248,700$20,660
Q2 2023RV CapitalBuy85,000288,747$23,986,213
Q2 2023Cantillon Capital ManagementBuy230,0683,834,468$318,529,257
Q2 2023Bares Capital ManagementSell-25,3722,571,299$213,597,808
Q1 20237G Capital ManagementBuy100100$8
Q1 2023Renaissance Technologies LLCSell-47,500212,400$17,536
Q1 2023RV CapitalBuy203,747203,747$16,821,352

Frequently asked questions about IBKR activity

  • Which institutional owners are buying IBKR?

    Institutional owners buying IBKR include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.

  • What does "buy" mean in IBKR activity?

    "Buy" means an investor increased their reported position in IBKR compared to the prior reporting period. This reflects growing exposure to INTERACTIVE BROKERS GRO-CL A (IBKR) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).

  • Is institutional interest in IBKR increasing?

    Institutional interest in IBKR can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.