---
schema_version: "secwatch.filing_event.v1"
accession: "0000842517-25-000018"
form_type: "8-K"
ticker: "ISBA"
cik: "0000842517"
company_name: "ISABELLA BANK CORP"
filed_at: "2025-01-31T23:59:59+00:00"
generated_at: "2026-05-27T05:02:06.230764+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.5
calibrated_materiality_score: 0.5
confidence: "high"
source: SEC EDGAR
---

# Isabella Bank Corp appoints Plante & Moran as new auditor for FY2025

## Summary
- Appointed Plante & Moran, PLLC as independent auditor for fiscal year ending December 31, 2025, effective January 27, 2025.
- Previous auditor Rehmann Robson resigned in March 2024 and will complete the 2024 audit and issue reports.
- No consultations with Plante occurred regarding accounting principles or audit opinions during the two most recent fiscal years or interim period.
- No disagreements or reportable events were identified with the predecessor auditor.

## SEC filing metadata
- accession: 0000842517-25-000018
- form_type: 8-K
- ticker: ISBA
- cik: 0000842517
- company_name: ISABELLA BANK CORP
- filed_at: 2025-01-31T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.5
- calibrated_materiality_score: 0.5
- confidence: high
- sec_items: 4.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/842517/000084251725000018/0000842517-25-000018-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/842517/000084251725000018/isba-20250127.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000842517-25-000018
- JSON: https://secwatch.observer/filing/0000842517-25-000018.json
- Plain text: https://secwatch.observer/filing/0000842517-25-000018.txt

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