---
schema_version: "secwatch.filing_event.v1"
accession: "0001437749-25-031386"
form_type: "8-K"
ticker: "MBWM"
cik: "0001042729"
company_name: "MERCANTILE BANK CORP"
filed_at: "2025-10-21T23:59:59+00:00"
generated_at: "2026-05-17T02:56:53.730830+00:00"
event_type: "earnings"
sentiment: "positive"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# Mercantile Bank Q3 net income $23.8M ($1.46 EPS), up from $19.6M YoY; NIM stable at 3.50%

## Summary
- Net revenue $62.4M (+7.6% YoY) on net interest income $52.0M (+7.7%) and noninterest income $10.4M.
- Effective tax rate dropped to 13.4% from 20.1% due to $1.0M energy tax credits and $0.7M tax structures.
- Loan-to-deposit ratio improved to 96% from 102% a year ago; local deposits up $84M YTD.
- Nonperforming assets rose to $9.8M (0.2% of assets) from $5.7M at year-end 2024, driven by one construction loan.
- Total risk-based capital ratio 14.3%; tangible book value $37.41 per share, up 13% since year-end 2024.

## SEC filing metadata
- accession: 0001437749-25-031386
- form_type: 8-K
- ticker: MBWM
- cik: 0001042729
- company_name: MERCANTILE BANK CORP
- filed_at: 2025-10-21T23:59:59+00:00
- event_type: earnings
- sentiment: positive
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 2.02, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1042729/000143774925031386/0001437749-25-031386-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1042729/000143774925031386/mbwm20250802_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001437749-25-031386
- JSON: https://secwatch.observer/filing/0001437749-25-031386.json
- Plain text: https://secwatch.observer/filing/0001437749-25-031386.txt

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