Mercantile Bank (MBWM) EVP logs stock awards, disposals and IRA holdings

Rhea-AI Filing Summary

Mercantile Bank Corp executive Mark S. Augustyn reported several changes in his common stock holdings. On 02/05/2026 he acquired 2,875 shares of common stock at $0 per share as a performance-based restricted stock award, which may be forfeited if specified performance metrics are not met, and separately acquired 1,437 additional shares at $0 per share. Earlier, on 12/19/2025 he disposed of 1,461 shares at $49.45 per share, and on 12/12/2025 he disposed of 2,022 shares at $0 per share. Following these transactions, he directly holds 32,499 common shares, with an additional 258 shares held indirectly in an IRA and 268 shares held indirectly by his spouse in an IRA.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Augustyn Mark S

(Last) (First) (Middle)

C/O MERCANTILE BANK CORPORATION

310 LEONARD ST. NW

(Street)

GRAND RAPIDS MI 49504

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
MERCANTILE BANK CORP [ MBWM ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP&Chief Comm Banking Officer

3. Date of Earliest Transaction (Month/Day/Year)
12/12/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	12/12/2025		G		2,022	D	$0	29,648	D
Common Stock	12/19/2025		F		1,461	D	$49.45	28,187	D
Common Stock	02/05/2026		A		2,875(1)	A	$0	31,602	D
Common Stock	02/05/2026		A		1,437	A	$0	32,499	D
Common Stock								258	I	In IRA
Common Stock								268	I	By spouse in IRA

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. 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.

	/s/ Bradley J. Wyatt, Attorney-in-Fact	02/09/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What insider transactions did MBWM executive Mark S. Augustyn report?

He reported multiple common stock transactions, including dispositions on 12/12/2025 and 12/19/2025 and acquisitions on 02/05/2026. These transactions changed both his directly owned and indirectly held Mercantile Bank Corp (MBWM) share balances.

How many MBWM shares does Mark S. Augustyn own after the reported Form 4 transactions?

After the reported transactions, he directly owns 32,499 shares of Mercantile Bank Corp common stock. In addition, 258 shares are held indirectly in an IRA and 268 shares are held indirectly by his spouse in an IRA.

What is notable about the 2,875-share award reported by MBWM’s Augustyn?

The 2,875-share award is a performance-based restricted stock award. According to the disclosure, some or all of these shares may be forfeited in the future if the issuer’s specified performance metrics are not achieved.

What price per share was reported for the MBWM stock disposition on 12/19/2025?

The 12/19/2025 disposition of Mercantile Bank Corp common stock was reported at a price of $49.45 per share. This transaction reduced Mark S. Augustyn’s directly held position before later stock awards increased his holdings.

What role does Mark S. Augustyn hold at Mercantile Bank Corp (MBWM)?

He is reported as an officer of Mercantile Bank Corp with the title EVP & Chief Commercial Banking Officer. This senior executive role is disclosed alongside his Form 4 insider ownership and transaction details.

Are all MBWM shares reported by Augustyn held directly in his own name?

No. He directly owns 32,499 common shares, while 258 shares are held indirectly in an IRA and 268 shares are held indirectly by his spouse in an IRA. These indirect interests are reported separately.