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MERCANTILE BANK CORP

For the period ended May 21, 2026. Filed Apr 2, 2026.

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What shareholders are asked to vote on at a company's meeting. It is where to find what directors and top executives are paid, and who owns the most shares.

May 21, 2026 · Filed Apr 2, 2026

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MBWM$60.57+0.5%Stored close · as of Nov 6, 2026
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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the Securities

Exchange Act of 1934 (Amendment No. )

Filed by the Registrant ☑

Filed by a Party other than the Registrant ☐

Check the appropriate box:

☐Preliminary Proxy Statement
☐CONFIDENTIAL, FOR USE OF THE COMMISSION ONLY (AS PERMITTED BY RULE 14a-6(e)(2))
☑Definitive Proxy Statement
☐Definitive Additional Materials
☐Soliciting Material Pursuant to Section 240.14a-12

MERCANTILE BANK CORPORATION

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (check the appropriate box):

☑No fee required.
☐Fee paid previously with preliminary materials.
☐Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11

PERSONS WHO POTENTIALLY ARE TO RESPOND TO THE COLLECTION OF INFORMATION CONTAINED IN THIS FORM ARE NOT REQUIRED TO RESPOND UNLESS THE FORM DISPLAYS A CURRENTLY VALID OMB CONTROL NUMBER.

SEC 1913 (02-02)

Notice of 2026 Annual Meeting of Shareholders

To our Shareholders:

We are pleased to announce that the 2026 annual meeting of shareholders of Mercantile Bank Corporation will be held virtually, in lieu of an in-person meeting, on Thursday, May 21, 2026, at 9:00 a.m., Eastern Time. Shareholders who wish to attend the meeting may do so via live webcast. Shareholders who attend the virtual meeting will be able to participate and submit questions prior to and during the meeting as described in more detail in the accompanying proxy statement. The meeting is being held for the purpose of considering and voting on the following matters:

1.Election of twelve directors, each for a one-year term.
2.Ratification of the appointment of Plante & Moran, PLLC as our independent registered public accounting firm for 2026 (“Auditor Ratification”).
3.An advisory vote to approve the compensation of our named executive officers disclosed in this proxy statement (“Say-On-Pay”).
4.Any other business that may properly be brought before the meeting or any adjournment of the meeting.

All shareholders of record at the close of business on Friday, March 27, 2026, are entitled to notice of the meeting, and any postponements or adjournments of the meeting. Shareholders of record will have the opportunity to vote on the matters to be presented at the meeting via proxy in advance of the meeting. In light of the virtual format, we will not receive in-person voting at this year’s meeting.

Your vote is important. We urge you to submit your proxy (1) over the internet, (2) by telephone or (3) by mail, in advance of the virtual meeting, whether or not you plan to attend. For specific instructions, please refer to the discussion beginning on the first page of the proxy statement and the instructions on the proxy card relating to the annual meeting. We would appreciate receiving your proxy by Friday, May 8, 2026.

By Order of the Board of Directors,

Michael H. Price

Chairman of the Board

Dated: April 2, 2026

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