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
Q2 2018Cantillon Capital ManagementSell-67,7072,473,537$159,320
Q2 2018ARK InvestBuy2544,906$316
Q2 2018Bares Capital ManagementBuy192,1205,044,137$324,893
Q1 2018Sequoia Financial AdvisorsSell-8,94491,256$6,136
Q1 2018Oakcliff Capital PartnersSell-74,973244,496$16,439
Q1 2018Renaissance Technologies LLCBuy95,600417,900$28,100
Q1 2018Ancient Art (Teton Capital)Sell-415,1841,986,613$133,580
Q1 2018Cantillon Capital ManagementBuy501,1912,541,244$170,873
Q1 2018ARK InvestBuy4,1374,652$313
Q1 2018Bares Capital ManagementBuy9,4354,852,017$326,250
Q4 2017Oakcliff Capital PartnersSell-144,419319,469$18,915
Q4 2017Renaissance Technologies LLCBuy105,978322,300$19,083
Q4 2017Cantillon Capital ManagementSell-105,7122,040,053$120,791
Q4 2017Ancient Art (Teton Capital)Sell-1,008,5192,401,797$142,210
Q4 2017ARK InvestBuy515515$30
Q4 2017Bares Capital ManagementBuy280,5744,842,582$286,729
Q3 2017Renaissance Technologies LLCBuy47,222216,322$9,743
Q3 2017Oakcliff Capital PartnersSell-20,466463,888$20,893
Q3 2017Cantillon Capital ManagementBuy219,8742,145,765$96,645
Q3 2017Bares Capital ManagementBuy97,0994,562,008$205,473
Q2 2017Renaissance Technologies LLCSell-30,800169,100$6,328
Q2 2017Cantillon Capital ManagementBuy1,925,8911,925,891$72,067
Q2 2017Ancient Art (Teton Capital)Buy101,1213,410,316$127,614
Q2 2017Bares Capital ManagementBuy450,3044,464,909$167,077
Q1 2017Renaissance Technologies LLCBuy86,300199,900$6,941
Q1 2017Oakcliff Capital PartnersBuy484,354484,354$16,817
Q1 2017Ancient Art (Teton Capital)Buy7,9433,309,195$114,895
Q1 2017Bares Capital ManagementBuy788,0864,014,605$139,387
Q4 2016Ancient Art (Teton Capital)Sell-17,1213,301,252$120,529
Q4 2016Bares Capital ManagementBuy33,3883,226,519$117,800

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.