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 Form 13F filings. 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
Q4 2018Oakcliff Capital PartnersBuy58,000343,955$18,797
Q4 2018Cantillon Capital ManagementBuy23,5952,638,920$144,217
Q4 2018ARK InvestSell-1,3744,674$255
Q3 2018Bares Capital ManagementBuy814,0465,858,183$324,016
Q3 2018Cantillon Capital ManagementBuy141,7882,615,325$144,653
Q3 2018Ancient Art (Teton Capital)Buy59,9961,469,316$81,268
Q3 2018Oakcliff Capital PartnersBuy56,486285,955$15,816
Q3 2018ARK InvestBuy1,1426,048$335
Q2 2018Ancient Art (Teton Capital)Sell-577,2931,409,320$90,774
Q2 2018Bares Capital ManagementBuy192,1205,044,137$324,893
Q2 2018Cantillon Capital ManagementSell-67,7072,473,537$159,320
Q2 2018Oakcliff Capital PartnersSell-15,027229,469$14,780
Q2 2018ARK InvestBuy2544,906$316
Q1 2018Cantillon Capital ManagementBuy501,1912,541,244$170,873
Q1 2018Ancient Art (Teton Capital)Sell-415,1841,986,613$133,580
Q1 2018Renaissance Technologies LLCBuy95,600417,900$28,100
Q1 2018Oakcliff Capital PartnersSell-74,973244,496$16,439
Q1 2018Bares Capital ManagementBuy9,4354,852,017$326,250
Q1 2018Sequoia Financial AdvisorsSell-8,94491,256$6,136
Q1 2018ARK InvestBuy4,1374,652$313
Q4 2017Ancient Art (Teton Capital)Sell-1,008,5192,401,797$142,210
Q4 2017Bares Capital ManagementBuy280,5744,842,582$286,729
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 2017ARK InvestBuy515515$30
Q3 2017Cantillon Capital ManagementBuy219,8742,145,765$96,645
Q3 2017Bares Capital ManagementBuy97,0994,562,008$205,473
Q3 2017Renaissance Technologies LLCBuy47,222216,322$9,743
Q3 2017Oakcliff Capital PartnersSell-20,466463,888$20,893

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.

Related IBKR Institutional Insights