Canonical: https://ownershiptrace.com/13f/companies/15 # Who owns Interactive Brokers Group, Inc. (IBKR)? Elite investor 13F holders 14 tracked elite investors reported holding Interactive Brokers Group, Inc as of 2026-06-30, including Cantillon Capital Management, Egerton Capital, Viking Global Investors, D.E. Shaw, Oakcliff Capital. Who bought, trimmed or exited each quarter, with links to the original SEC 13F filings. 14 tracked investors currently reported holding · Latest report period: 2026-06-30 · Financials · Financial Services Interactive Brokers Group, Inc. operates as an automated electronic broker in the United States and internationally. The company engages in the execution, clearance, and settlement of trades in stocks, options, futures, foreign exchange instruments, bonds, precious metals, and cryptocurrencies; and the company provides custody, prime brokerage, securities, and margin lending services. It also… ## Reported holders and securities, including exits (up to 20) | Investor | Security | Instrument | Report period | Filed | Value | Quantity | Units | Change | Source | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | [Cantillon Capital Management](https://ownershiptrace.com/13f/investors/87) | INTERACTIVE BROKERS GROUP IN | SHARE | 2026-06-30 | 2026-07-29 00:00:00 | 45072184.00 USD | 517833.000000 | Shares | reduce | [Original filing](https://www.sec.gov/Archives/edgar/data/1279936/0001279936-26-000005-index.html) | | [Egerton Capital](https://ownershiptrace.com/13f/investors/46) | INTERACTIVE BROKERS GROUP IN | SHARE | 2026-06-30 | 2026-07-21 00:00:00 | 359424369.00 USD | 4129416.000000 | Shares | reduce | [Original filing](https://www.sec.gov/Archives/edgar/data/1581811/0001581811-26-000007-index.html) | | [Viking Global Investors](https://ownershiptrace.com/13f/investors/81) | INTERACTIVE BROKERS GROUP IN | SHARE | 2026-06-30 | 2026-08-14 00:00:00 | 420468306.00 USD | 4830748.000000 | Shares | add | [Original filing](https://www.sec.gov/Archives/edgar/data/1103804/0001103804-26-000006-index.html) | | [D.E. Shaw](https://ownershiptrace.com/13f/investors/98) | INTERACTIVE BROKERS GROUP IN | SHARE | 2026-06-30 | 2026-08-14 00:00:00 | 139484559.00 USD | 1602534.000000 | Shares | add | [Original filing](https://www.sec.gov/Archives/edgar/data/1009207/0001104659-26-097217-index.html) | | [Oakcliff Capital](https://ownershiptrace.com/13f/investors/13) | INTERACTIVE BROKERS GROUP IN | SHARE | 2026-06-30 | 2026-08-13 00:00:00 | 89715610.00 USD | 1030740.000000 | Shares | hold | [Original filing](https://www.sec.gov/Archives/edgar/data/1657335/0001172661-26-003363-index.html) | | [Tudor Investment](https://ownershiptrace.com/13f/investors/94675) | INTERACTIVE BROKERS GROUP IN | SHARE | 2026-06-30 | 2026-08-14 00:00:00 | 64576282.00 USD | 741915.000000 | Shares | add | [Original filing](https://www.sec.gov/Archives/edgar/data/923093/0000902664-26-003485-index.html) | | [RV Capital GmbH](https://ownershiptrace.com/13f/investors/66) | INTERACTIVE BROKERS GROUP IN | SHARE | 2026-06-30 | 2026-08-14 00:00:00 | 48836925.00 USD | 561086.000000 | Shares | reduce | [Original filing](https://www.sec.gov/Archives/edgar/data/1766596/0001766596-26-000007-index.html) | | [Lone Pine Capital](https://ownershiptrace.com/13f/investors/71) | INTERACTIVE BROKERS GROUP IN | SHARE | 2026-06-30 | 2026-08-14 00:00:00 | 50280049.00 USD | 577666.000000 | Shares | buy | [Original filing](https://www.sec.gov/Archives/edgar/data/1061165/0000919574-26-005485-index.html) | | [Renaissance Technologies LLC](https://ownershiptrace.com/13f/investors/63) | INTERACTIVE BROKERS GROUP IN | SHARE | 2026-06-30 | 2026-08-13 00:00:00 | 5561856.00 USD | 63900.000000 | Shares | reduce | [Original filing](https://www.sec.gov/Archives/edgar/data/1037389/0001037389-26-000059-index.html) | | [Gotham Asset Management](https://ownershiptrace.com/13f/investors/94672) | INTERACTIVE BROKERS GROUP IN | SHARE | 2026-06-30 | 2026-08-14 00:00:00 | 9515996.00 USD | 109329.000000 | Shares | reduce | [Original filing](https://www.sec.gov/Archives/edgar/data/1510387/0001398344-26-014644-index.html) | | [Bridgewater Associates](https://ownershiptrace.com/13f/investors/8) | INTERACTIVE BROKERS GROUP IN | SHARE | 2026-06-30 | 2026-08-14 00:00:00 | 3662295.00 USD | 42076.000000 | Shares | reduce | [Original filing](https://www.sec.gov/Archives/edgar/data/1350694/0001350694-26-000003-index.html) | | [GMO](https://ownershiptrace.com/13f/investors/94674) | INTERACTIVE BROKERS GROUP IN | SHARE | 2026-06-30 | 2026-08-13 00:00:00 | 1832105.00 USD | 21049.000000 | Shares | buy | [Original filing](https://www.sec.gov/Archives/edgar/data/1352662/0001072613-26-000636-index.html) | | [GAMCO](https://ownershiptrace.com/13f/investors/137) | INTERACTIVE BROKERS GROUP IN | SHARE | 2026-06-30 | 2026-08-12 00:00:00 | 1433984.00 USD | 16475.000000 | Shares | reduce | [Original filing](https://www.sec.gov/Archives/edgar/data/807249/0001140361-26-032508-index.html) | | [Ancora Advisors / Ancora Holdings](https://ownershiptrace.com/13f/investors/101) | INTERACTIVE BROKERS GROUP IN | SHARE | 2026-06-30 | 2026-08-14 00:00:00 | 10445.00 USD | 120.000000 | Shares | reduce | [Original filing](https://www.sec.gov/Archives/edgar/data/1446114/0001446114-26-000012-index.html) | Public disclosures can be delayed, incomplete, or amended. 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