---
schema_version: "secwatch.filing_event.v1"
accession: "0001437749-26-001502"
form_type: "8-K/A"
ticker: "MBWM"
cik: "0001042729"
company_name: "MERCANTILE BANK CORP"
filed_at: "2026-01-20T23:59:59+00:00"
generated_at: "2026-05-16T09:28:09.928785+00:00"
event_type: "other"
sentiment: "neutral"
materiality_score: 0.25
calibrated_materiality_score: 0.25
confidence: "low"
source: SEC EDGAR
---

# Mercantile Bank amends Q4 2025 earnings presentation to correct 2026 overhead and fee income slide

## Summary
- Amendment corrects error on slide 26: overhead costs for Q1-Q4 2026 and fee income for Q3-Q4 2026.
- All other information from original January 20, 2026 earnings release remains unchanged.
- Revised presentation furnished as Exhibit 99.1; original Q4 2025 financial results unaffected.
- No specific corrected metrics disclosed in the filing; full presentation not viewable.

## SEC filing metadata
- accession: 0001437749-26-001502
- form_type: 8-K/A
- ticker: MBWM
- cik: 0001042729
- company_name: MERCANTILE BANK CORP
- filed_at: 2026-01-20T23:59:59+00:00
- event_type: other
- sentiment: neutral
- materiality_score: 0.25
- calibrated_materiality_score: 0.25
- confidence: low
- sec_items: 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1042729/000143774926001502/0001437749-26-001502-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1042729/000143774926001502/mbwm20260120_8ka.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001437749-26-001502
- JSON: https://secwatch.observer/filing/0001437749-26-001502.json
- Plain text: https://secwatch.observer/filing/0001437749-26-001502.txt

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