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 2025Egerton Capital UKSell-14,2041,833,969$303,686,927
Q1 2025RV CapitalSell-11,867212,480$35,184,563
Q4 2024Egerton Capital UKSell-1,534,3401,848,173$326,516,724
Q4 2024Renaissance Technologies LLCBuy225,910604,910$106,869,450
Q4 2024Bares Capital ManagementSell-164,877951,647$168,127,475
Q4 2024RV CapitalSell-91,200224,347$40,146,896
Q4 2024Cantillon Capital ManagementBuy18,0473,395,690$599,916,552
Q4 2024Ancient Art (Teton Capital)Sell-10,455445,909$78,778,743
Q4 2024Oakcliff Capital PartnersSell-2,962299,685$52,945,349
Q3 2024Bares Capital ManagementSell-1,416,1411,116,524$155,598,785
Q3 2024Egerton Capital UKBuy249,1433,382,513$471,387,012
Q3 2024Renaissance Technologies LLCBuy217,400379,000$52,817,440
Q3 2024Cantillon Capital ManagementSell-100,9323,377,643$470,708,328
Q3 2024Ancient Art (Teton Capital)Sell-68,810456,364$63,598,887
Q3 2024RV CapitalBuy5,600315,547$43,974,630
Q2 2024Egerton Capital UKBuy309,6733,133,370$384,151,162
Q2 2024Bares Capital ManagementSell-277,4662,532,665$310,504,729
Q2 2024Renaissance Technologies LLCSell-236,900161,600$19,812,160
Q2 2024Cantillon Capital ManagementSell-177,1293,478,575$426,473,295
Q2 2024Ancient Art (Teton Capital)Sell-25,000525,174$64,386,332
Q1 2024Egerton Capital UKBuy2,823,6972,823,697$315,435,192
Q1 2024Bares Capital ManagementBuy264,5432,810,131$313,919,734
Q1 2024Renaissance Technologies LLCBuy247,800398,500$44,516
Q1 2024Cantillon Capital ManagementSell-73,1653,655,704$408,378,694
Q1 2024Oakcliff Capital PartnersSell-37,000302,647$33,808,696
Q4 2023Cantillon Capital ManagementSell-90,7603,728,869$309,123,240
Q4 2023RV CapitalBuy21,200309,947$25,694,606
Q4 2023Bares Capital ManagementSell-20,8072,545,588$211,029,245
Q4 2023Renaissance Technologies LLCSell-16,400150,700$12,493
Q3 2023Renaissance Technologies LLCSell-81,600167,100$14,464

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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