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美国

证券交易委员会

华盛顿特区 20549

表格 8-K

当前报告

根据《1934年证券交易法》第13条或第15(d)条

《1934年证券交易法》

报告日期（最早事件报告日期）：2026年10月20日

Mercantile Bank Corporation

(注册人章程中指定的名称)

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密歇根州

000-26719

38-3360865

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(州或其他司法管辖区

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的成立地)

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(委员会文件

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编号)

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(IRS 雇主

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识别编号)

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310 Leonard Street NW, Grand Rapids, 密歇根州	49504
(主要执行办公室地址)	(邮政编码)

注册人的电话号码，包括地区代码	616-406-3000

如果本8-K表格的提交旨在同时满足注册人根据以下任何规定下的提交义务，请在下面的适当框中打勾（参见下面的一般说明A.2）：

☐ 根据《证券法》第425条的书面沟通（17 CFR 230.425）

☐ 根据《交易法》第14a-12条的征求材料（17 CFR 240.14a-12）

☐ 根据《交易法》第14d-2(b)条的开始前沟通（17 CFR 240.14d-2(b)）

☐ 根据《交易法》第13e-4(c)条的开始前沟通（17 CFR 240.13e-4(c)）

根据《法案》第12(b)条注册的证券：

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\n\t\t\t 每类证券的名称 \n\t\t\t	\n\t\t\t 交易符号 \n\t\t\t	\n\t\t\t 每类证券注册的交易所名称 \n\t\t\t
\n\t\t\t 普通股 \n\t\t\t	\n\t\t\t MBWM \n\t\t\t	\n\t\t\t 纳斯达克股票市场有限责任公司 \n\t\t\t

通过打勾表明注册人是否是根据《1933年证券法》第405条（17 CFR §230.405）或《1934年证券交易法》第12b-2条（17 CFR §240.12b-2）定义的新兴成长公司。

新兴成长公司 ☐

如果为新兴成长公司，请通过打勾表明注册人是否选择不使用《交易法》第13(a)条规定的任何新修订的财务会计标准的延长过渡期。 ☐

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第2.02项

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经营成果和财务状况。

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收益公告

2026年10月20日，Mercantile Bank Corporation（“公司”）发布了一份新闻稿，宣布截至2026年9月30日季度的收益和其他财务结果。该新闻稿作为本报告的附件99.1提供，并在此引用。

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第7.01项

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公平披露披露。

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公司已准备了演示材料（“电话会议及网络直播演示文稿”），管理层计划在之前宣布的2026年第三季度电话会议中使用，该会议于2026年10月20日星期二上午10:00东部时间举行，并在之后不时用于介绍公司运营和业绩的演示。公司可能会在向现有和潜在投资者、分析师、贷款人、业务合作伙伴、收购候选者、客户、员工以及其他对公司及其业务有兴趣的人士的演示中使用该电话会议及网络直播演示文稿，可能进行修改。

A copy of the Conference Call & Webcast Presentation is furnished as Exhibit 99.2 to this report and incorporated here by reference. The Conference Call & Webcast Presentation is also available on the Company's website at http://ir.mercbank.com. Materials on the Company’s website are not part of or incorporated by reference into this report.

In accordance with General Instruction B.2 of Form 8-K, the information in this Current Report on Form 8-K, including Exhibits 99.1 and 99.2, shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liability of that section, and shall not be incorporated by reference into any registration statement or other document filed under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

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Item 9.01

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Financial Statements and Exhibits.

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(d) Exhibits.

Exhibit Number Description

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99.1

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Press release of Mercantile Bank Corporation dated October 20, 2026, reporting financial results and earnings for the quarter ended September 30, 2026.

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99.2

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Mercantile Bank Corporation Conference Call & Webcast Presentation dated October 20, 2026.

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104

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Cover Page Interactive Data File (embedded within the Inline XBRL document)

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Signatures

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

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\n\t\t\t\n\t\t\t	\n\t\t\t Mercantile Bank Corporation \n\t\t\t	\n\t\t\t\n\t\t\t
\n\t\t\t\n\t\t\t	\n\t\t\t\n\t\t\t	\n\t\t\t\n\t\t\t	\n\t\t\t\n\t\t\t
\n\t\t\t\n\t\t\t	\n\t\t\t By: \n\t\t\t	\n\t\t\t /s/ Charles E. Christmas \n\t\t\t	\n\t\t\t\n\t\t\t
\n\t\t\t\n\t\t\t	\n\t\t\t\n\t\t\t	\n\t\t\t Charles E. Christmas \n\t\t\t	\n\t\t\t\n\t\t\t
\n\t\t\t\n\t\t\t	\n\t\t\t\n\t\t\t	\n\t\t\t Executive Vice President, Chief \n\t\t\t	\n\t\t\t\n\t\t\t
		Financial Officer and Treasurer

Date: October 20, 2026

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