{"schema_version":"secwatch.filing_event.v1","accession":"0001628280-25-051169","form_type":"8-K","ticker":"OSG","cik":"0000874501","company_name":"OCTAVE SPECIALTY GROUP INC","filed_at":"2025-11-10T23:59:59+00:00","discovered_at":"2026-05-14T18:02:42.424408+00:00","generated_at":"2026-05-16T22:49:17.376377+00:00","sec_items":["5.03","9.01"],"event_type":"other_material","sentiment":"positive","materiality_score":0.55,"calibrated_materiality_score":0.55,"confidence":"high","headline":"Ambac rebrands to Octave Specialty Group, new ticker OSG starting Nov 20","bullets":["Name changed to Octave Specialty Group, Inc. effective Nov 10, 2025; AMBC ticker to OSG on Nov 20.","Subsidiaries rebranded: Cirrata Group becomes Octave Partners, Beat Capital Partners becomes Octave Ventures.","Legacy financial guarantee business sold; company now focused on building MGA platform across U.S., U.K., Bermuda.","CEO Claude LeBlanc says rebrand marks culmination of transformation into a diversified specialty insurance enterprise."],"urls":{"canonical":"https://secwatch.observer/filing/0001628280-25-051169","json":"https://secwatch.observer/filing/0001628280-25-051169.json","markdown":"https://secwatch.observer/filing/0001628280-25-051169.md","text":"https://secwatch.observer/filing/0001628280-25-051169.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/874501/000162828025051169/0001628280-25-051169-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/874501/000162828025051169/ambc-20251110.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-16T22:49:17.376377+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":[{"claim_id":"1b5210240d2aa81b258a429cc11c1bea7afa26e5","claim":"OCTAVE SPECIALTY GROUP INC: Amended certificate of incorporation to change company name to 'Octave Specialty Group, Inc.' (effective 2025-11-10).","evidence_excerpt":"On November 10, 2025, the Company filed with the Secretary of State of the State of Delaware a certificate of amendment to its certificate of incorporation, changing the Company’s name to “Octave Specialty Group, Inc.” (the “Name Change”).","evidence_source":"SEC 8-K Item 5.03/5.05/5.06","evidence_url":"https://www.sec.gov/Archives/edgar/data/874501/000162828025051169/0001628280-25-051169-index.htm","confidence":0.9,"family_label":"Governance Changes","details":[{"label":"Change","value":"charter amendment"},{"label":"Effective","value":"2025-11-10"}],"fact_type":"governance_change"},{"claim_id":"8820e33eb1be3a20537689e3cdd3c52ab2e44a80","claim":"OCTAVE SPECIALTY GROUP INC: Amended and restated bylaws to reflect the company name change (effective 2025-11-10).","evidence_excerpt":"In connection with the Name Change, the bylaws of the Company were amended and restated in their entirety to reflect the Name Change.","evidence_source":"SEC 8-K Item 5.03/5.05/5.06","evidence_url":"https://www.sec.gov/Archives/edgar/data/874501/000162828025051169/0001628280-25-051169-index.htm","confidence":0.9,"family_label":"Governance Changes","details":[{"label":"Change","value":"bylaw amendment"},{"label":"Effective","value":"2025-11-10"}],"fact_type":"governance_change"}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}