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
Q3 2016Renaissance Technologies LLCBuy35,700113,600$4,007
Q3 2016Bares Capital ManagementBuy576,5813,193,131$112,622
Q2 2016AltaRock PartnersSell-20,0007,201$255
Q2 2016Renaissance Technologies LLCBuy3,00077,900$2,758
Q2 2016Sequoia Financial AdvisorsBuy96,189100,200$3,547
Q2 2016Ancient Art (Teton Capital)Sell-163,0353,318,373$117,470
Q2 2016Bares Capital ManagementBuy375,9412,616,550$92,626
Q1 2016Sequoia Financial AdvisorsBuy4,0114,011$102,000
Q1 2016Ancient Art (Teton Capital)Buy263,3953,481,408$136,889
Q1 2016Bares Capital ManagementBuy838,0602,240,609$88,101
Q4 2015Renaissance Technologies LLCSell-217,04674,900$3,266
Q4 2015Ancient Art (Teton Capital)Sell-319,7143,218,013$140,305
Q4 2015Bares Capital ManagementBuy477,8341,402,549$61,151
Q3 2015AltaRock PartnersSell-5,90027,201$1,074
Q3 2015Renaissance Technologies LLCBuy255,846291,946$11,523
Q3 2015Ancient Art (Teton Capital)Buy1483,537,727$139,634
Q3 2015Eagle Capital ManagementBuy16,50016,500$651
Q3 2015Bares Capital ManagementBuy924,715924,715$36,499
Q2 2015AltaRock PartnersBuy33,10133,101$1,376
Q1 2015Renaissance Technologies LLCSell-253,80036,100$1,228
Q1 2015Ancient Art (Teton Capital)Buy134,1213,537,579$120,348
Q4 2014Renaissance Technologies LLCBuy15,200289,900$8,453
Q4 2014Ancient Art (Teton Capital)Buy90,0323,403,458$99,245
Q3 2014Renaissance Technologies LLCSell-161,200274,700$6,854
Q3 2014Ancient Art (Teton Capital)Buy134,2333,313,426$82,670
Q2 2014Renaissance Technologies LLCSell-86,131435,900$10,152
Q2 2014Ancient Art (Teton Capital)Buy20,0003,179,193$74,043
Q1 2014Renaissance Technologies LLCSell-112,769522,031$11,312
Q1 2014Ancient Art (Teton Capital)Buy278,1913,159,193$68,460
Q4 2013Renaissance Technologies LLCBuy190,900634,800$15,451

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.