Mark S. Augustyn - 12 Dec 2025 Form 4 Insider Report for MERCANTILE BANK CORP (MBWM)

Reporting relationship: EVP&Chief Comm Banking Officer
Issuer ticker: MBWM
Reported as of: 12 Dec 2025
Net transaction value: -$72,246
SEC form: 4
Accepted by SEC: 09 Feb 2026, 18:11:35 UTC
Prior SEC filing: 10 Feb 2025
Source filing: View source filing
Reporting owner signature: /s/ Bradley J. Wyatt, Attorney-in-Fact

Key filing fact

Mark S. Augustyn filed Form 4 for MERCANTILE BANK CORP (MBWM) on 09 Feb 2026.

Key facts

This page summarizes Mark S. Augustyn's Form 4 filing for MERCANTILE BANK CORP (MBWM).
4 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 09 Feb 2026, 18:11.

Change

Previous filing in this sequence was filed on 10 Feb 2025.
Current net transaction value: -$72,246.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0002050906 Primary reporting owner

Augustyn Mark S

Relationship: EVP&Chief Comm Banking Officer
Address: C/O MERCANTILE BANK CORPORATION, 310 LEONARD ST. NW, GRAND RAPIDS
Signature: /s/ Bradley J. Wyatt, Attorney-in-Fact
Signature date: 09 Feb 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

MBWM transaction

Common Stock

Gift

Transaction value: $0
Shares: -2,022
Change %: -6.4%
Price: $0.000000
Shares after: 29,648
Date: 12 Dec 2025
Ownership: Direct

MBWM transaction

Common Stock

Tax liability

Transaction value: $72,246
Shares: -1,461
Change %: -4.9%
Price: $49.45
Shares after: 28,187
Date: 19 Dec 2025
Ownership: Direct

MBWM transaction

Common Stock

Award

Transaction value: $0
Shares: +2,875
Change %: +10%
Price: $0.000000
Shares after: 31,602
Date: 05 Feb 2026
Ownership: Direct
Footnotes: F1

MBWM transaction

Common Stock

Award

Transaction value: $0
Shares: +1,437
Change %: +4.6%
Price: $0.000000
Shares after: 32,499
Date: 05 Feb 2026
Ownership: Direct

MBWM holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 258
Date: 12 Dec 2025
Ownership: In IRA

MBWM holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 268
Date: 12 Dec 2025
Ownership: By spouse in IRA

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 1 footnote

Footnote F1

This award of shares is being made pursuant to the Issuer's performance-based restricted stock award agreement, such that a portion or all of this award of restricted stock may be forfeited in the future if certain performance metrics are not met.