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 13F filings (Q1 2026). 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
Q1 2015Ancient Art (Teton Capital)Buy134,1213,537,579$120,348
Q4 2014Ancient Art (Teton Capital)Buy90,0323,403,458$99,245
Q4 2014Renaissance Technologies LLCBuy15,200289,900$8,453
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 2014Ancient Art (Teton Capital)Buy278,1913,159,193$68,460
Q1 2014Renaissance Technologies LLCSell-112,769522,031$11,312
Q4 2013Renaissance Technologies LLCBuy190,900634,800$15,451
Q3 2013Ancient Art (Teton Capital)Buy184,4852,881,002$54,076
Q3 2013Renaissance Technologies LLCBuy33,700443,900$8,332
Q2 2013Ancient Art (Teton Capital)Buy2,696,5172,696,517$43,063
Q2 2013Renaissance Technologies LLCBuy410,200410,200$6,551

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.

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