{"schema_version":"secwatch.filing_event.v1","accession":"0000842517-25-000199","form_type":"8-K","ticker":"ISBA","cik":"0000842517","company_name":"ISABELLA BANK CORP","filed_at":"2025-10-09T23:59:59+00:00","discovered_at":"2026-05-14T18:02:42.341103+00:00","generated_at":"2026-05-17T04:16:52.153127+00:00","sec_items":["5.02","9.01"],"event_type":"leadership","sentiment":"neutral","materiality_score":0.25,"calibrated_materiality_score":0.25,"confidence":"high","headline":"Isabella Bank appoints Brian Tessin, Dow Chief Tax Officer, to its boards effective Oct 6, 2025","bullets":["Brian Tessin appointed to Isabella Bank Corp and Isabella Bank boards, term until 2026 annual meeting.","Tessin is Chief Tax Officer at Dow Inc. with 30+ years in tax and financial leadership.","Board determined Tessin is an independent director under SEC rules.","Press release issued Oct 9, 2025, announcing the appointment."],"urls":{"canonical":"https://secwatch.observer/filing/0000842517-25-000199","json":"https://secwatch.observer/filing/0000842517-25-000199.json","markdown":"https://secwatch.observer/filing/0000842517-25-000199.md","text":"https://secwatch.observer/filing/0000842517-25-000199.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/842517/000084251725000199/0000842517-25-000199-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/842517/000084251725000199/isba-20251006.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-17T04:16:52.153127+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"}