Mercantile Bank director Sanchez acquires 36 shares

Sanchez also reported 3,502 common shares held indirectly in an IRA.

Rhea-AI Filing Summary

Mercantile Bank Corp (MBWM) director Nelson F. Sanchez acquired 36 common shares on October 22, 2026, through reinvestment of cash dividends under the issuer’s dividend reinvestment plan. The acquisition was reported as directly held, bringing his reported direct holdings to 3,953 shares.

Insider Trade Summary

Grant/Award: 36 shares

Grant/Award 2 txns

Insider Sanchez Nelson F

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock F1	36	$0.00	$0.00
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 3,953 shares (Direct); Common Stock — 3,502 shares (Indirect, IRA)

Footnotes (1)

1. F1. Includes shares acquired since last report of common stock ownership by reinvesting cash dividends under the Issuer's dividend reinvestment plan.

Key Figures

Common shares acquired: 36 shares Direct common shares held after transaction: 3,953 shares Common shares held indirectly: 3,502 shares

3 metrics

Common shares acquired 36 shares October 22, 2026; acquired through dividend reinvestment

Direct common shares held after transaction 3,953 shares Reported after the October 22, 2026 transaction

Common shares held indirectly 3,502 shares Held in an IRA; reported October 22, 2026

Key Terms

dividend reinvestment plan, IRA

2 terms

dividend reinvestment plan financial

"reinvesting cash dividends under the Issuer's dividend reinvestment plan"

A dividend reinvestment plan lets shareholders automatically use cash dividends to buy more shares of the same company instead of receiving the money. It matters to investors because it turns regular payouts into a steady way to grow ownership and take advantage of compound returns—like having your savings automatically buy additional slices of a pie over time—while often reducing transaction costs and smoothing purchase timing.

IRA financial

"common shares held indirectly in an IRA"

An individual retirement account (IRA) is a savings account designed to help people put aside money for their retirement, often with tax advantages that encourage long-term savings. It matters to investors because it can grow over time, providing financial security later in life, and offers benefits that can reduce current taxes or allow investments to compound more effectively.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many MBWM shares did Nelson F. Sanchez acquire?

Nelson F. Sanchez acquired 36 common shares on October 22, 2026, through reinvestment of cash dividends under the issuer’s dividend reinvestment plan.

How many MBWM shares did Nelson F. Sanchez report after the transaction?

Sanchez reported 3,953 directly held shares after the transaction and 3,502 shares held indirectly in an IRA.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 10/26/2026 - 05:16 PM EDT Accepted by SEC EDGAR 10/26/2026 - 05:15 PM EDT Learn about SEC filing dates

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
Estimated average burden
hours per response:			0.5

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^*

Sanchez Nelson F

(Last) (First) (Middle)

C/O MERCANTILE BANK CORPORATION

310 LEONARD ST.

(Street)

GRAND RAPIDS MICHIGAN 49504

(City) (State) (Zip)

UNITED STATES

(Country)

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

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

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/22/2026

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

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

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

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	10/22/2026		A		36	A	$0	3,953(1)	D
Common Stock								3,502	I	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. Includes shares acquired since last report of common stock ownership by reinvesting cash dividends under the Issuer's dividend reinvestment plan.

	/s/ Adin J. Tarr, Attorney-in-Fact	10/26/2026
	** 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.
* Form 4: SEC 1474 (03-26)