---
schema_version: "secwatch.filing_event.v1"
accession: "0000842517-26-000222"
form_type: "8-K"
ticker: "ISBA"
cik: "0000842517"
company_name: "ISABELLA BANK CORP"
filed_at: "2026-09-21T20:30:15+00:00"
generated_at: "2026-09-21T20:31:49.098732+00:00"
event_type: "m_and_a"
sentiment: "neutral"
materiality_score: 0.5
calibrated_materiality_score: 0.5
confidence: "high"
source: SEC EDGAR
---

# Isabella Bank's merger with Grand River gets shareholder approval; close expected Q4 2026

## Summary
- Grand River shareholders approved merger agreement at special meeting on Sept 18, 2026.
- Merger structure: Merger Sub merges into Grand River, then Grand River into Isabella, then Grand River Bank into Isabella Bank.
- Transaction expected to close in Q4 2026 subject to receipt of all regulatory approvals and customary closing conditions.
- Ultimate survivor is Isabella Bank Corporation; Grand River Bank to merge into Isabella Bank.

## SEC filing metadata
- accession: 0000842517-26-000222
- form_type: 8-K
- ticker: ISBA
- cik: 0000842517
- company_name: ISABELLA BANK CORP
- filed_at: 2026-09-21T20:30:15+00:00
- event_type: m_and_a
- sentiment: neutral
- materiality_score: 0.5
- calibrated_materiality_score: 0.5
- confidence: high
- sec_items: 8.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/842517/000084251726000222/0000842517-26-000222-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/842517/000084251726000222/isba-20260921.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000842517-26-000222
- JSON: https://secwatch.observer/filing/0000842517-26-000222.json
- Plain text: https://secwatch.observer/filing/0000842517-26-000222.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.