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
Q4 2025Renaissance Technologies LLCSell-347,245616,395$39,640,362
Q4 2025Cantillon Capital ManagementBuy95,87812,759,904$820,589,426
Q3 2025Sequoia Financial AdvisorsSell-87,6373,619$249,023
Q3 2025RV CapitalSell-50,653799,267$54,997,562
Q3 2025Renaissance Technologies LLCSell-1,015,300963,640$66,308,068
Q3 2025Egerton Capital UKSell-1,802,7106,254,134$430,346,961
Q3 2025Cantillon Capital ManagementSell-139,60512,664,026$871,411,630
Q3 2025Bares Capital ManagementSell-950,5112,060,589$141,789,129
Q2 2025RV CapitalBuy637,440849,920$47,094,067
Q2 2025Oakcliff Capital PartnersBuy773,0551,030,740$57,113,303
Q2 2025Ancient Art (Teton Capital)Buy1,232,7271,643,636$91,073,871
Q2 2025Renaissance Technologies LLCBuy1,269,6301,978,940$109,653,065
Q2 2025Egerton Capital UKBuy6,222,8758,056,844$446,429,726
Q2 2025Cantillon Capital ManagementBuy9,509,80512,803,631$709,449,194
Q2 2025Bares Capital ManagementBuy2,166,5633,011,100$166,845,051
Q1 2025RV CapitalSell-11,867212,480$35,184,563
Q1 2025Oakcliff Capital PartnersSell-42,000257,685$42,670,059
Q1 2025Ancient Art (Teton Capital)Sell-35,000410,909$68,042,421
Q1 2025Renaissance Technologies LLCBuy104,400709,310$117,454,643
Q1 2025Egerton Capital UKSell-14,2041,833,969$303,686,927
Q1 2025Cantillon Capital ManagementSell-101,8643,293,826$545,424,647
Q1 2025Bares Capital ManagementSell-107,110844,537$139,846,882
Q4 2024RV CapitalSell-91,200224,347$40,146,896
Q4 2024Oakcliff Capital PartnersSell-2,962299,685$52,945,349
Q4 2024Ancient Art (Teton Capital)Sell-10,455445,909$78,778,743
Q4 2024Renaissance Technologies LLCBuy225,910604,910$106,869,450
Q4 2024Egerton Capital UKSell-1,534,3401,848,173$326,516,724
Q4 2024Cantillon Capital ManagementBuy18,0473,395,690$599,916,552
Q4 2024Bares Capital ManagementSell-164,877951,647$168,127,475
Q3 2024RV CapitalBuy5,600315,547$43,974,630

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.