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
Q1 2023Ancient Art (Teton Capital)Sell-431,971578,378$47,750,888
Q1 2023Cantillon Capital ManagementBuy384,1863,604,400$297,579,264
Q1 2023Bares Capital ManagementSell-468,1492,596,671$214,381,158
Q4 2022Renaissance Technologies LLCSell-34,900259,900$18,804
Q4 2022Oakcliff Capital PartnersSell-21,600339,647$24,573,000
Q4 2022Ancient Art (Teton Capital)Sell-50,0001,010,349$73,098,750
Q4 2022Cantillon Capital ManagementBuy749,3423,220,214$232,982,483
Q4 2022Bares Capital ManagementSell-86,2343,064,820$221,739,727
Q3 2022Renaissance Technologies LLCBuy22,300294,800$18,841
Q3 2022Ancient Art (Teton Capital)Buy50,0001,060,349$67,767
Q3 2022Cantillon Capital ManagementSell-22,0392,470,872$157,914
Q3 2022Bares Capital ManagementSell-72,1863,151,054$201,384
Q2 2022Renaissance Technologies LLCSell-4,800272,500$14,990
Q2 2022Oakcliff Capital PartnersBuy61,400361,247$19,872
Q2 2022Cantillon Capital ManagementBuy268,4082,492,911$137,135
Q2 2022Bares Capital ManagementSell-777,6713,223,240$177,310
Q1 2022Renaissance Technologies LLCSell-201,300277,300$18,277
Q1 2022Oakcliff Capital PartnersBuy38,000299,847$19,763
Q1 2022Ancient Art (Teton Capital)Sell-125,6511,010,349$66,592
Q1 2022Cantillon Capital ManagementBuy62,0112,224,503$146,617
Q1 2022Bares Capital ManagementSell-1,186,4004,000,911$263,700
Q4 2021Renaissance Technologies LLCSell-49,700478,600$38,010
Q4 2021Thunderbird PartnersBuy12,988925,664$73,516
Q4 2021Ancient Art (Teton Capital)Sell-599,5931,136,000$90,221
Q4 2021Cantillon Capital ManagementSell-163,3262,162,492$171,745
Q4 2021Bares Capital ManagementSell-1,8835,187,311$411,976
Q3 2021Renaissance Technologies LLCSell-557,358528,300$32,934
Q3 2021Thunderbird PartnersBuy23,408912,676$56,896
Q3 2021Cantillon Capital ManagementSell-33,2482,325,818$144,992
Q3 2021Bares Capital ManagementBuy91,3955,189,194$323,494

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.