{"schema_version":"secwatch.filing_event.v1","accession":"0000842517-26-000224","form_type":"8-K","ticker":"ISBA","cik":"0000842517","company_name":"ISABELLA BANK CORP","filed_at":"2026-09-28T20:30:15+00:00","discovered_at":"2026-09-28T20:31:01.611259+00:00","generated_at":"2026-10-12T13:36:39.146611+00:00","sec_items":["8.01","9.01"],"event_type":"m_and_a","sentiment":"neutral","materiality_score":0.3,"calibrated_materiality_score":0.3,"confidence":"high","headline":"Isabella Bank sets Oct 23 election deadline for Grand River merger; cash consideration ~$5.71/share","bullets":["Grand River shareholders must submit Election Form to Continental Stock Transfer & Trust by 5:00 p.m. ET on Friday, October 23, 2026, to elect cash or Isabella common stock.","Election materials mailed on/about September 28, 2026 to holders of record as of September 24, 2026.","Each Grand River share converts into either cash (estimated ~$5.71 per share) or Isabella common stock at an estimated exchange ratio of 0.1413, subject to proration.","Cash consideration pool is $18,262,391; exchange ratio uses 839,003 Isabella shares, based on assumed 9,136,529 Grand River shares outstanding at closing.","Merger remains subject to regulatory approvals and customary closing conditions; parties expect to complete the deal in Q4 2026."],"urls":{"canonical":"https://secwatch.observer/filing/0000842517-26-000224","json":"https://secwatch.observer/filing/0000842517-26-000224.json","markdown":"https://secwatch.observer/filing/0000842517-26-000224.md","text":"https://secwatch.observer/filing/0000842517-26-000224.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/842517/000084251726000224/0000842517-26-000224-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/842517/000084251726000224/isba-20260928.htm"},"model":{"generated_by":"deepseek-v4.1-flash:cloud@v2","generated_at":"2026-10-12T13:36:39.146611+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"}