Exhibit 99.1

Mercantile Bank Corporation Announces Strong Second Quarter 2026 Results

Net interest income expansion, strong commercial loan growth, and sustained strength in asset quality metrics and capital levels highlight the quarter

GRAND RAPIDS, Mich., July 21, 2026 – Mercantile Bank Corporation (NASDAQ: MBWM) ("Mercantile") reported net income of $25.9 million, or $1.50 per diluted share, for the second quarter of 2026, compared with net income of $22.6 million, or $1.39 per diluted share, for the second quarter of 2025.  Net income during the first six months of 2026 totaled $48.6 million, or $2.82 per diluted share, compared with net income of $42.2 million, or $2.60 per diluted share, during the first six months of 2025.  Excluding non-recurring costs associated with the acquisition of Eastern Michigan Financial Corporation and the previously announced core and digital banking system conversion (a non-GAAP measurement), adjusted net income was $26.4 million, or $1.53 per diluted share, for the second quarter of 2026, and $51.7 million, or $2.99 per diluted share, for the first six months of 2026.  Using these non-GAAP measures, adjusted earnings per diluted share increased $0.14, or 10 percent, in the second quarter of 2026, and $0.39, or 15 percent, in the first six months of 2026, compared to the respective 2025 periods.

“We are very pleased to report another quarter of strong financial performance as we continue to successfully navigate our way through the extended and ongoing period of uncertain global economic conditions and heightened geopolitical concerns,” said Ray Reitsma, President and Chief Executive Officer of Mercantile.  “Our robust operating results were driven by increased net interest income, reflecting strong commercial loan growth and a higher net interest margin, a negative provision for credit losses, a significant increase in treasury management fees, a reduction in wholesale funds, and continuing strength in asset quality metrics.  As evidenced by the ongoing expansion of local deposits, we remain committed to funding earning asset growth with local deposit generation.”

Second quarter highlights include:

Operating Results

Net revenue, consisting of net interest income and noninterest income, was $68.8 million during the second quarter of 2026, up $7.8 million, or 12.8 percent, from $61.0 million during the prior-year second quarter.  Net interest income during the current-year second quarter was $57.3 million, up $7.8 million, or 15.7 percent, from $49.5 million during the respective 2025 period mainly due to growth in earning assets and a higher net interest margin.  Eastern Michigan Bank’s net interest income totaled $5.9 million during the second quarter of 2026.  Noninterest income totaled $11.5 million during the second quarter of 2026, virtually unchanged from the level recorded during the second quarter of 2025; increases in treasury management fees, bank owned life insurance income, and payroll services fees were offset by reductions in interest rate swap and mortgage banking income.  Eastern Michigan Bank generated $0.6 million in noninterest income during the second quarter of 2026, primarily consisting of deposit service charges.

The net interest margin was 3.59 percent in the second quarter of 2026, up from 3.48 percent in the prior-year second quarter.  The yield on average earning assets was 5.42 percent during the current-year second quarter, a decline from 5.75 percent during the respective 2025 period.  The decreased yield largely stemmed from a lower yield on loans and a change in earning asset mix, which more than offset an improved yield on securities resulting from the reinvestment of relatively low-yielding bonds and portfolio expansion activities, along with the positive impact resulting from the addition of Eastern Michigan Bank’s securities portfolio.  The yield on loans was 6.01 percent during the second quarter of 2026, down from 6.29 percent during the second quarter of 2025, mainly due to reduced interest rates on variable-rate commercial loans resulting from the Federal Open Market Committee (“FOMC”) lowering the targeted federal funds rate.  The FOMC decreased the targeted federal funds rate by 25 basis points in each of September, October, and December of 2025, during which time average variable-rate commercial loans represented approximately 77 percent of average total commercial loans.  Reflecting a strategic initiative to lower the loan-to-deposit ratio and the impact of Eastern Michigan Bank’s liquid balance sheet, relatively higher-yielding loans represented a decreased percentage of earning assets and relatively lower-yielding securities accounted for an increased percentage of earning assets in the second quarter of 2026 compared to the second quarter of 2025.  The yield on securities equaled 3.36 percent during the second quarter of 2026, up from 2.82 percent during the prior-year second quarter.  The yield on other interest-earning assets, primarily consisting of funds on deposit with the Federal Reserve Bank of Chicago, declined from 4.91 percent during the second quarter of 2025 to 4.04 percent during the respective 2026 period, reflecting the decreased interest rate environment.

During the second quarter of 2026, the cost of funds was 1.83 percent, down from 2.27 percent during the second quarter of 2025, mainly due to lower rates paid on money market accounts and time deposits, reflecting the decreased interest rate environment.  An increase in low-cost deposit products as a percentage of total funding sources, primarily stemming from the addition of Eastern Michigan Bank’s deposit base, and a reduction in brokered deposits also contributed to the reduced cost of funds.  The latter reflects a strategy to refine the deposit base whereby the reliance on the brokered deposit market and other higher-priced deposit-only relationships is reduced.

Mercantile recorded provisions for credit losses of negative $1.8 million and positive $1.6 million during the second quarters of 2026 and 2025, respectively.  The negative provision expense recorded during the current-year second quarter mainly reflected the elimination of a $2.7 million specific allocation associated with the resolution of a nonperforming commercial construction loan, which was partially offset by changes in the economic forecast, allocations necessitated by net loan growth, and an increase in qualitative factor allocations.  The recording of net loan recoveries and sustained strength in loan quality metrics during both periods positively impacted necessary provision levels. 

Noninterest income totaled $11.5 million during the second quarter of 2026, up slightly from the level recorded during the prior-year second quarter.  Growth in treasury management fees, bank owned life insurance income, and payroll services fees was offset by lower levels of interest rate swap and mortgage banking income.  The increases in treasury management and payroll services fees largely resulted from new commercial customer acquisitions and customers’ expanded use of products and services, as well as a modified fee schedule.  The reduction in interest rate swap income primarily reflected a lower volume of new swap transactions, while the decrease in mortgage banking income mainly resulted from accelerated mortgage servicing rights amortization resulting from an increased level of payoffs, a change in the quarter-end fair value of commitments to originate salable residential mortgage loans and a lower percentage of loans originated with the intent to sell.

Noninterest expense totaled $39.4 million during the second quarter of 2026, compared to $33.4 million during the second quarter of 2025.  Excluding non-recurring costs aggregating $0.5 million related to the core and digital banking system conversion and $0.1 million associated with the acquisition of Eastern Michigan Financial Corporation, noninterest expense increased $5.4 million during the current-year second quarter compared to the respective 2025 period.  Eastern Michigan Bank’s noninterest expense totaled $4.0 million during the second quarter of 2026, including salary and benefit costs of $1.8 million and core deposit intangible asset amortization of $0.9 million.  The remaining increase in noninterest expense largely reflected higher salary and benefit costs, along with cost inflation and an expanded balance sheet and branch network.  A $1.4 million decrease in allocations to the reserve for unfunded loan commitments, mainly reflecting a lower level of commercial loan commitments that have been accepted by customers, positively impacted noninterest expense during the second quarter of 2026.

Federal income tax expense was $5.3 million during the second quarter of 2026, compared to $3.3 million during the prior-year second quarter.  The increase in federal income tax expense primarily resulted from a higher level of income before federal income tax and a lower level of net benefits from transferable energy tax credits.  Mercantile’s effective tax rate, which equaled 16.9 percent and 12.9 percent during the second quarters of 2026 and 2025, respectively, has been positively impacted by tax benefits derived from the acquisition of transferable energy tax credits and low-income housing and historic tax credit investments.

Mr. Reitsma commented, “The robust increase in net interest income during the second quarter of 2026 resulted from strong commercial loan growth and an improved net interest margin, which was largely driven by a reduced cost of funds and the upward repricing of matured fixed-rate loans and securities.  As demonstrated by the solid growth in treasury management and payroll services fees, we continue to be successful in our efforts to cultivate new customer relationships and further develop existing clients’ relationships.  We remain focused on expanding our balance sheet in a cost-effective fashion while continuing to deliver excellent service and market-leading products and services to our clients.  Total overhead expense, excluding costs associated with the core and digital banking system conversion and acquisition of Eastern Michigan Financial Corporation, as a percentage of net revenue during the second quarter of 2026 approximated the level during the prior-year second quarter.”

Balance Sheet

Total assets were $6.82 billion as of June 30, 2026, down $15.7 million from December 31, 2025.  Total loans increased $98.9 million, or an annualized 8.2 percent, during the second quarter of 2026, and $93.7 million, or an annualized 3.9 percent, during the first six months of 2026, primarily reflecting commercial loan portfolio expansion of $115 million, or an annualized 11.7 percent, and $132 million, or an annualized 6.8 percent, during the respective periods.  Commercial loans grew in both 2026 periods despite the full payoffs and partial paydowns of certain larger relationships, which aggregated $121 million during the second quarter of 2026, and $301 million during the first six months of 2026. The payoffs and paydowns, which mainly resulted from sales of assets, secondary market refinancings, and customers using excess cash flows generated within their operations to make line of credit reductions, subsided as anticipated during the second quarter of 2026 compared to the first quarter of 2026, although remaining above the historical average of approximately $50 million per quarter.  Payoffs and paydowns during 2025 were also well above historical levels, totaling approximately $363 million and averaging about $91 million per quarter.  Commercial loan originations, consisting of loans to new customers and increases in existing credit relationships, remained strong across all segments during the first six months of 2026.  Residential mortgage loans were down $17.7 million and $40.3 million during the second quarter and first six months of 2026, respectively, while other consumer loans increased $1.6 million and $2.3 million during the respective periods. 

During the first six months of 2026, interest-earning deposits declined $149 million, and securities available for sale were up $23.3 million.  The reduction in interest-earning deposits primarily resulted from funds being used to originate loans, purchase securities, and payoff matured brokered deposits and Federal Home Loan Bank of Indianapolis (“FHLBI”) advances.

As of June 30, 2026, unfunded commitments on commercial construction and development loans, which are expected to be funded over the next 12 to 18 months, and residential construction loans, which are expected to be largely funded over the next 12 months, totaled $236 million and $47.4 million, respectively.  The unused balance on construction loans remains relatively stable as new construction loan opportunities are identified and as construction loans shift to term real estate loans upon completion of the projects.

Commercial and industrial loans and owner-occupied commercial real estate loans combined represented approximately 58 percent of total commercial loans as of June 30, 2026, a level that has remained relatively consistent with prior periods and in line with our expectations.

Total deposits equaled $5.30 billion as of June 30, 2026, compared to $5.28 billion as of December 31, 2025.  Local deposits grew $122 million, or an annualized 4.8 percent, during the first six months of 2026, while brokered deposits decreased $110 million.  The increase in local deposits, which occurred despite the normal level of seasonal noninterest-bearing deposit withdrawals by customers to make bonus and tax payments and partnership distributions, reflected successful client acquisition efforts and net growth in various existing deposit relationships.  The loan-to-deposit ratio equaled 93 percent as of June 30, 2026, down from 100 percent as of June 30, 2025, largely due to an increase in local deposits.  As of June 30, 2026, wholesale funds, consisting of FHLBI advances and brokered deposits, were $325 million, or approximately 6 percent of total funds, compared to approximately 8 percent and 10 percent as of December 31, 2025, and June 30, 2025, respectively.  Noninterest-bearing checking accounts represented approximately 27 percent of total deposits as of June 30, 2026.

Mr. Reitsma noted, “We are very pleased with the growth in the commercial loan portfolio during the second quarter and first six months of 2026, especially when factoring in the level of payoffs and line of credit paydowns during the periods.  Our commercial loan pipeline remains robust, which combined with ongoing conversations with existing and potential borrowers, should provide us with meaningful opportunities to originate loans in forthcoming periods.  We remain committed to funding lending opportunities with local deposit generation.”

Asset Quality

Nonperforming assets totaled $5.8 million, or 0.1 percent of total assets, as of June 30, 2026, compared to $7.9 million, or 0.1 percent of total assets, as of December 31, 2025, and $9.7 million, or 0.2 percent of total assets, as of June 30, 2025.  The decreases in nonperforming assets during the first six months of 2026 and twelve months ended June 30, 2026, mainly reflected the resolution of a nonperforming commercial construction loan, which had been placed on nonaccrual during the second quarter of 2025 and represented approximately 57 percent and 35 percent of total nonperforming assets as of June 30, 2025, and December 31, 2025, respectively.  Specific allocations totaling $5.5 million and ultimately equaling the full loan balance were made during the second and third quarters of 2025, with the loan balance charged down by $2.8 million during the fourth quarter of 2025.   During the second quarter of 2026, the loan’s remaining book balance of $2.7 million was paid off, eliminating the remaining specific allocation balance, and a recovery of $0.2 million was recorded.  The level of past due loans remains minimal.  During the second quarter of 2026, loan charge-offs were nominal, while recoveries of prior period loan charge-offs equaled $0.5 million, providing for net loan recoveries of $0.5 million, or an annualized 0.04 percent of average total loans.

Mr. Reitsma remarked, “As reflected by ongoing low levels of nonperforming assets, past due loans, and loan charge-offs, our asset quality metrics remained robust during the second quarter of 2026.  We remain committed to underwriting all loan types in a disciplined manner and identifying any deteriorating commercial loan relationships or emerging systemic or sector-specific credit problems as soon as possible to limit the impact of such on our overall financial health.  Our sound collection and conservative charge-off practices were evident during the current-year second quarter with the full resolution of a significant nonperforming commercial construction loan, which represented our largest nonperforming loan as of March 31, 2026.  The resiliency of our commercial loan clients during the extended and ongoing period of uncertain macro-economic conditions has been noteworthy.”

Capital Position

Shareholders’ equity totaled $755 million as of June 30, 2026, up $30.2 million from December 31, 2025.  Mercantile Bank and Eastern Michigan Bank each maintained “well-capitalized” positions as of June 30, 2026, with total risk-based capital ratios of 13.5 percent and 23.1 percent, respectively.  As of June 30, 2026, Mercantile Bank and Eastern Michigan Bank had approximately $205 million and $36.3 million, respectively, in excess of the 10 percent minimum regulatory threshold required to be categorized as a “well-capitalized” institution.

Mercantile reported 17,285,911 total shares outstanding as of June 30, 2026.

Mr. Reitsma concluded, “Our ongoing strong financial condition enabled us to continue our regular cash dividend program, and as demonstrated by our announcement of an increased third quarter 2026 cash dividend, we remain committed to building shareholder value through meaningful cash returns.  Based on the continuing strength of our operating results, asset quality measures, capital levels and loan funding opportunities, along with the expected realization of solid financial performance in upcoming periods, we believe we are positioned to successfully address any challenges arising from the prolonged and ongoing period of unstable economic and operating conditions.  Our steadfast focus on meeting customers’ needs has been instrumental in retaining established relationships and fostering new relationships, and we believe a similar focus in future periods as planned should provide us with ample opportunities to originate loans and generate local deposits.”

Investor Presentation

Mercantile has prepared presentation materials that management intends to use during its previously announced second quarter 2026 conference call on Tuesday, July 21, 2026, at 10:00 a.m. Eastern Time, and from time to time thereafter in presentations about the company’s operations and performance.  These materials, which are available for viewing in the Investor Relations section of Mercantile’s website at www.mercbank.com, have been furnished to the U.S. Securities and Exchange Commission concurrently with this press release.

About Mercantile Bank Corporation

Based in Grand Rapids, Michigan, Mercantile Bank Corporation is the bank holding company for Mercantile Bank and Eastern Michigan Bank.  Mercantile Bank and Eastern Michigan Bank provide financial products and services in a professional and personalized manner designed to make banking easier for businesses, individuals, and governmental units.  Distinguished by exceptional service, knowledgeable staff, and a commitment to the communities they serve, Mercantile Bank and Eastern Michigan Bank together comprise one of the largest Michigan-based banking organizations with total combined assets of approximately $6.8 billion. Mercantile Bank Corporation's common stock is listed on the NASDAQ Global Select Market under the symbol "MBWM." For more information about Mercantile, visit www.mercbank.com, and follow us on Facebook, Instagram, X (formerly Twitter) @MercBank, and LinkedIn @merc-bank.

Reconciliation of U.S. GAAP to Non-GAAP Financial Measures

This news release contains certain non-GAAP financial measures, including adjusted net income and adjusted diluted earnings per share, each of which excludes costs associated with (i) Mercantile’s acquisition of Eastern Michigan Financial Corporation that was completed during the fourth quarter of 2025 ($0.1 million and $0.4 million during the second quarter and first six months of 2026, respectively), and (ii) the previously announced core and digital banking system conversion ($0.5 million and $3.5 million during the second quarter and first six months of 2026, respectively), on an after-tax basis. These non-GAAP financial measures are identified in this news release where they appear.  We believe that presenting these non-GAAP financial measures provides investors, analysts, and other interested parties with meaningful supplementary information to assess Mercantile’s underlying operational performance by removing the effect of costs we consider to be non-recurring in nature and not reflective of Mercantile’s core operating results.  These non-GAAP financial measures are used by management to evaluate Mercantile’s ongoing operations, for internal planning and forecasting purposes, and to assess period-over-period comparability.  Management believes it is useful for the reader to review these non-GAAP adjusted measures alongside the GAAP measures.  Our definition of these adjusted financial measures may differ from similarly named measures used by others.  These non-GAAP measures have limitations as an analytical tool and should not be considered in isolation or as a substitute for our GAAP measures.  Our net income and diluted earnings per share are presented on a GAAP-basis in the first paragraph of this release.

Forward-Looking Statements

This news release contains statements and information that may constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995.  Forward-looking statements can be identified by words such as: “anticipate,” “intend,” “plan,” “goal,” “seek,” “believe,” “project,” “estimate,” “expect,” “endeavor,” “strategy,” “future,” “likely,” “may,” “should,” “will,” and similar references to future periods.  Any such statements are based on current expectations that involve a number of risks and uncertainties.  Actual results may differ materially from the results expressed in forward-looking statements.  Factors that might cause such a difference include difficulties and delays in the ongoing integration of Mercantile Bank and Eastern Michigan Bank and achieving anticipated synergies, cost savings and other benefits from the transaction; changes in interest rates and interest rate relationships; increasing rates of inflation and slower growth rates or recession; significant declines in the value of commercial real estate; market volatility; demand for products and services; climate impacts; labor markets; the degree of competition by traditional and nontraditional financial services companies; changes in banking regulation or actions by bank regulators; changes in tax laws and other laws and regulations applicable to us; changes in prices, levies, and assessments; the impact of technological advances; potential cyber-attacks, information security breaches and other criminal activities; litigation liabilities; governmental and regulatory policy changes; the outcomes of existing or future contingencies; trends in customer behavior as well as their ability to repay loans; changes in local real estate values; damage to our reputation resulting from adverse publicity, regulatory actions, litigation, operational failures, and the failure to meet client expectations and other factors; changes in the national and local economies; unstable political and economic environments; disease outbreaks, such as the COVID-19 pandemic or similar public health threats, and measures implemented to combat them; and other factors, including those expressed as risk factors, disclosed from time to time in filings made by Mercantile with the Securities and Exchange Commission.  Mercantile undertakes no obligation to update or clarify forward-looking statements, whether as a result of new information, future events or otherwise, except as required by law.  Investors are cautioned not to place undue reliance on any forward-looking statements contained herein.

FOR FURTHER INFORMATION: