INTERACTIVE BROKERS GRO-CL A (IBKR) Institutional Ownership Changes & 13F Activity

INTERACTIVE BROKERS GRO-CL A (IBKR) institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC 13F filings (Q1 2026). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions among tracked filers. Notable filers include Cantillon Capital Management, Viking Global Investors, Egerton Capital UK, Ancient Art (Teton Capital), and Renaissance Technologies LLC.

Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q1 2026Cantillon Capital ManagementSell-1,514,02311,245,881$754,261,239
Q1 2026Viking Global InvestorsBuy1,394,3291,394,329$93,517,646
Q1 2026Egerton Capital UKSell-664,4026,275,179$420,876,256
Q1 2026Ancient Art (Teton Capital)Sell-358,4431,285,193$86,197,895
Q1 2026Renaissance Technologies LLCSell-154,695461,700$30,966,219
Q1 2026RV CapitalBuy5,441757,919$51,111,227
Q1 2026Sequoia Financial AdvisorsBuy3,17510,338$693,377
Q4 2025Egerton Capital UKBuy685,4476,939,581$446,284,454
Q4 2025Renaissance Technologies LLCSell-347,245616,395$39,640,362
Q4 2025Cantillon Capital ManagementBuy95,87812,759,904$820,589,426
Q4 2025RV CapitalSell-46,789752,478$48,391,860
Q4 2025Sequoia Financial AdvisorsBuy3,5447,163$460,672
Q3 2025Egerton Capital UKSell-1,802,7106,254,134$430,346,961
Q3 2025Renaissance Technologies LLCSell-1,015,300963,640$66,308,068
Q3 2025Bares Capital ManagementSell-950,5112,060,589$141,789,129
Q3 2025Cantillon Capital ManagementSell-139,60512,664,026$871,411,630
Q3 2025Sequoia Financial AdvisorsSell-87,6373,619$249,023
Q3 2025RV CapitalSell-50,653799,267$54,997,562
Q2 2025Cantillon Capital ManagementBuy9,509,80512,803,631$709,449,194
Q2 2025Egerton Capital UKBuy6,222,8758,056,844$446,429,726
Q2 2025Bares Capital ManagementBuy2,166,5633,011,100$166,845,051
Q2 2025Renaissance Technologies LLCBuy1,269,6301,978,940$109,653,065
Q2 2025Ancient Art (Teton Capital)Buy1,232,7271,643,636$91,073,871
Q2 2025Oakcliff Capital PartnersBuy773,0551,030,740$57,113,303
Q2 2025RV CapitalBuy637,440849,920$47,094,067
Q1 2025Bares Capital ManagementSell-107,110844,537$139,846,882
Q1 2025Renaissance Technologies LLCBuy104,400709,310$117,454,643
Q1 2025Cantillon Capital ManagementSell-101,8643,293,826$545,424,647
Q1 2025Oakcliff Capital PartnersSell-42,000257,685$42,670,059
Q1 2025Ancient Art (Teton Capital)Sell-35,000410,909$68,042,421

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.

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