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 2020Ancient Art (Teton Capital)Buy272,3001,891,573$81,659
Q1 2020Cantillon Capital ManagementSell-7,1482,495,290$107,721
Q1 2020ARK InvestBuy12,50030,321$1,309
Q1 2020Bares Capital ManagementSell-1,393,5036,080,112$262,478
Q4 2019Oakcliff Capital PartnersBuy40,000383,955$17,900
Q4 2019Cantillon Capital ManagementSell-52,7712,502,438$116,664
Q4 2019ARK InvestSell-10,18917,821$831
Q4 2019Bares Capital ManagementBuy35,4017,473,615$348,420
Q3 2019Cantillon Capital ManagementSell-18,4062,555,209$137,419
Q3 2019ARK InvestBuy1,11628,010$1,506
Q3 2019Bares Capital ManagementBuy194,2907,438,214$400,027
Q2 2019Cantillon Capital ManagementSell-45,0232,573,615$139,490
Q2 2019ARK InvestBuy7,29026,894$1,458
Q2 2019Bares Capital ManagementBuy59,3557,243,924$392,621
Q1 2019Ancient Art (Teton Capital)Sell-5001,619,273$84,008
Q1 2019Cantillon Capital ManagementSell-20,2822,618,638$135,855
Q1 2019ARK InvestBuy14,93019,604$1,017
Q1 2019Bares Capital ManagementBuy255,0987,184,569$372,735
Q4 2018Oakcliff Capital PartnersBuy58,000343,955$18,797
Q4 2018Ancient Art (Teton Capital)Buy150,4571,619,773$88,521
Q4 2018Cantillon Capital ManagementBuy23,5952,638,920$144,217
Q4 2018ARK InvestSell-1,3744,674$255
Q4 2018Bares Capital ManagementBuy1,071,2886,929,471$378,696
Q3 2018Oakcliff Capital PartnersBuy56,486285,955$15,816
Q3 2018Ancient Art (Teton Capital)Buy59,9961,469,316$81,268
Q3 2018Cantillon Capital ManagementBuy141,7882,615,325$144,653
Q3 2018ARK InvestBuy1,1426,048$335
Q3 2018Bares Capital ManagementBuy814,0465,858,183$324,016
Q2 2018Oakcliff Capital PartnersSell-15,027229,469$14,780
Q2 2018Ancient Art (Teton Capital)Sell-577,2931,409,320$90,774

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.