{"schema_version":"secwatch.filing_event.v1","accession":"0000947484-23-000136","form_type":"8-K","ticker":"ACGL","cik":"0000947484","company_name":"ARCH CAPITAL GROUP LTD.","filed_at":"2023-12-21T23:59:59+00:00","discovered_at":"2026-05-14T18:03:32.484756+00:00","generated_at":"2026-06-07T09:39:07.552907+00:00","sec_items":["7.01"],"event_type":"m_and_a","sentiment":"neutral","materiality_score":0.5,"calibrated_materiality_score":0.5,"confidence":"medium","headline":"Arch Capital subsidiary to sell Castel Underwriting Agencies to Ryan Specialty Holdings","bullets":["Arch Financial Holdings (UK) Ltd signed definitive agreement to sell Castel Underwriting Agencies Ltd.","Buyer is a subsidiary of Ryan Specialty Holdings, Inc.; expected closing H1 2024 subject to approvals.","Castel is a London-based managing general underwriting platform; no financial terms disclosed.","Sale subject to regulatory approvals and customary closing conditions; no further details provided."],"urls":{"canonical":"https://secwatch.observer/filing/0000947484-23-000136","json":"https://secwatch.observer/filing/0000947484-23-000136.json","markdown":"https://secwatch.observer/filing/0000947484-23-000136.md","text":"https://secwatch.observer/filing/0000947484-23-000136.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/947484/000094748423000136/0000947484-23-000136-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/947484/000094748423000136/acgl-20231221.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-06-07T09:39:07.552907+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"}