{"schema_version":"secwatch.filing_event.v1","accession":"0001193125-25-066218","form_type":"8-K","ticker":"WRB","cik":"0000011544","company_name":"BERKLEY W R CORP","filed_at":"2025-03-28T23:59:59+00:00","discovered_at":"2026-05-14T18:03:03.044184+00:00","generated_at":"2026-05-24T02:55:04.861452+00:00","sec_items":["8.01","9.01"],"event_type":"other_material","sentiment":"positive","materiality_score":0.8,"calibrated_materiality_score":0.8,"confidence":"high","headline":"Mitsui Sumitomo to buy 15% of W.R. Berkley shares; Berkley family keeps stake","bullets":["MSI to purchase 15% of WRB common stock via open-market/private transactions from third parties only.","Berkley family (owning ~16%) will not sell any shares; will retain two board seats.","After MSI reaches 4.9% ownership, MSI agrees to vote with Berkley family recommendations.","At 12.5%, Berkley family will nominate an MSI director designee for Board approval.","Investment subject to regulatory approvals; expected to close by end of March 2026."],"urls":{"canonical":"https://secwatch.observer/filing/0001193125-25-066218","json":"https://secwatch.observer/filing/0001193125-25-066218.json","markdown":"https://secwatch.observer/filing/0001193125-25-066218.md","text":"https://secwatch.observer/filing/0001193125-25-066218.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/11544/000119312525066218/0001193125-25-066218-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/11544/000119312525066218/d934374d8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-24T02:55:04.861452+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"}