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
Q2 2017Cantillon Capital ManagementBuy1,925,8911,925,891$72,067
Q2 2017Bares Capital ManagementBuy450,3044,464,909$167,077
Q2 2017Ancient Art (Teton Capital)Buy101,1213,410,316$127,614
Q2 2017Renaissance Technologies LLCSell-30,800169,100$6,328
Q1 2017Bares Capital ManagementBuy788,0864,014,605$139,387
Q1 2017Oakcliff Capital PartnersBuy484,354484,354$16,817
Q1 2017Renaissance Technologies LLCBuy86,300199,900$6,941
Q1 2017Ancient Art (Teton Capital)Buy7,9433,309,195$114,895
Q4 2016Bares Capital ManagementBuy33,3883,226,519$117,800
Q4 2016Ancient Art (Teton Capital)Sell-17,1213,301,252$120,529
Q3 2016Bares Capital ManagementBuy576,5813,193,131$112,622
Q3 2016Renaissance Technologies LLCBuy35,700113,600$4,007
Q2 2016Bares Capital ManagementBuy375,9412,616,550$92,626
Q2 2016Ancient Art (Teton Capital)Sell-163,0353,318,373$117,470
Q2 2016Sequoia Financial AdvisorsBuy96,189100,200$3,547
Q2 2016AltaRock PartnersSell-20,0007,201$255
Q2 2016Renaissance Technologies LLCBuy3,00077,900$2,758
Q1 2016Bares Capital ManagementBuy838,0602,240,609$88,101
Q1 2016Ancient Art (Teton Capital)Buy263,3953,481,408$136,889
Q1 2016Sequoia Financial AdvisorsBuy4,0114,011$102,000
Q4 2015Bares Capital ManagementBuy477,8341,402,549$61,151
Q4 2015Ancient Art (Teton Capital)Sell-319,7143,218,013$140,305
Q4 2015Renaissance Technologies LLCSell-217,04674,900$3,266
Q3 2015Bares Capital ManagementBuy924,715924,715$36,499
Q3 2015Renaissance Technologies LLCBuy255,846291,946$11,523
Q3 2015Eagle Capital ManagementBuy16,50016,500$651
Q3 2015AltaRock PartnersSell-5,90027,201$1,074
Q3 2015Ancient Art (Teton Capital)Buy1483,537,727$139,634
Q2 2015AltaRock PartnersBuy33,10133,101$1,376
Q1 2015Renaissance Technologies LLCSell-253,80036,100$1,228

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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