{"schema_version":"secwatch.filing_event.v1","accession":"0001381197-26-000130","form_type":"8-K","ticker":"IBKR","cik":"0001381197","company_name":"Interactive Brokers Group, Inc.","filed_at":"2026-07-31T17:02:54+00:00","discovered_at":"2026-07-31T17:04:01.416526+00:00","generated_at":"2026-07-31T17:04:12.610893+00:00","sec_items":["8.01","9.01"],"event_type":"other_material","sentiment":"neutral","materiality_score":0.4,"calibrated_materiality_score":0.4,"confidence":"medium","headline":"Interactive Brokers files prospectus supplement to sell 2,499,567 shares of common stock","bullets":["Company filed a Prospectus Supplement under Rule 424(b)(5) to take down 2,499,567 shares off its shelf registration.","Shares are offered under Registration Statement No. 333-297857 filed July 31, 2026.","Legal opinion of Dechert LLP regarding share validity filed as Exhibit 5.2.","No offering price or use of proceeds disclosed in the 8-K."],"urls":{"canonical":"https://secwatch.observer/filing/0001381197-26-000130","json":"https://secwatch.observer/filing/0001381197-26-000130.json","markdown":"https://secwatch.observer/filing/0001381197-26-000130.md","text":"https://secwatch.observer/filing/0001381197-26-000130.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1381197/000138119726000130/0001381197-26-000130-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1381197/000138119726000130/ibkr-20260731.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-07-31T17:04:12.610893+00:00"},"review":{"review_status":"machine_generated","human_reviewed":false,"corrected":false,"correction_note":null,"correction_timestamp":null,"superseded_by":null,"related_filings":[]},"source_grounded_claims":[],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}