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Interactive Brokers Group, Inc. (IBKR) major ownership & activist stakes

13G Passive 5%+ stake (13G)
filed 2026-04-30
SEC.gov →
13G/A Passive 5%+ stake (13G) — amendment
filed 2026-03-27
SEC.gov →
13G/A Passive 5%+ stake (13G) — amendment
filed 2025-11-07
SEC.gov →
13G/A Passive 5%+ stake (13G) — amendment
filed 2025-10-17
SEC.gov →
13G/A Passive 5%+ stake (13G) — amendment
filed 2025-09-08
SEC.gov →
13G/A Passive 5%+ stake (13G) — amendment
filed 2025-02-14
SEC.gov →
13G/A Passive 5%+ stake (13G) — amendment
filed 2025-02-05
SEC.gov →
13G/A Passive 5%+ stake (13G) — amendment
filed 2024-11-14
SEC.gov →
13G/A Passive 5%+ stake (13G) — amendment
filed 2024-11-13
SEC.gov →
13D/A Possible activist stake (13D) — amendment
filed 2024-10-10
SEC.gov →
13G Passive 5%+ stake (13G)
filed 2024-02-14
SEC.gov →
13G/A Passive 5%+ stake (13G) — amendment
filed 2024-02-13
SEC.gov →

A 13D signals a large holder who may push for change; a 13G is a passive 5%+ position. Who the filer is and what they want is decoded in the app.

Who just took a 5%+ position in IBKR — and are they activists? Get the filer and their intent in plain English.

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