Mercantile Bank Corporation (MBWM) Earnings

Management highlights

### Strategic Acquisition Execution and Integration - The December 31, 2025 acquisition of Eastern Michigan Bank has met strategic objectives for deposit growth, loan growth, and net interest margin stability, and integration is progressing well with successful cultural alignment. - Eastern Michigan Bank acquisition improved deposit mix: non-interest bearing deposits now make up 27% of total deposits (up from 25% YoY), and lower-cost deposits make up 24% (up from 20% YoY), supporting margin stability. ### Balance Sheet and Financial Strength - Maintains top-quartile ROA performance among peer banks, with a 1.52% ROA and 14% ROE in Q2 2026; 5-year CAGR of tangible book value per share is 9%, and 5-year EPS CAGR is 15.1%, placing Mercantile in the top tier of its peer group. - Net interest margin remained stable despite market rate changes: over the last 5 quarters, the 90-day average SOFR dropped 71 basis points, while Mercantile's NIM increased 11 basis points to 3.59%, confirming successful match-funding strategies that offset asset sensitivity from large floating-rate asset holdings. - The loan-to-deposit ratio declined to 93% as of Q2 2026, down from 100% in Q2 2025, driven by deposit growth outpacing loan growth; 12-month total deposit growth through Q2 2026 was 12.4%, with a 5-year deposit CAGR of 9.2%. ### Asset Quality - Nonperforming assets equal 9 basis points of total assets as of Q2 2026, maintaining the bank's historically low levels; the 6.5-year average ratio of nonperforming loans to total loans is 12 basis points. - Allowance for credit losses equals 1.13% of total loans, with a dollar volume nearly 10x the level of nonperforming loans, providing strong coverage of potential credit losses; the negative $1.8 million provision for credit losses in Q2 2026 reflected resolution of a specific nonperforming construction loan partially offset by reserve builds for net loan growth. ### Capital Position - Both Mercantile Bank and Eastern Michigan Bank remain well-capitalized from a regulatory perspective: Mercantile's total risk-based capital ratio is 13.5% ($205 million above the well-capitalized minimum threshold), and Eastern Michigan's total risk-based capital ratio is 23.1% ($36 million above the minimum threshold). ### Strategic Expansion and Investments - Continued expansion in the Southeast Michigan market, with recent aggressive hiring on commercial and treasury management teams to capture growth in this large, underpenetrated market. - Ongoing core and digital banking system conversion, with targeted completion in February 2027, expected to deliver long-term operational efficiency and improved customer experience.

Guidance

- Full year 2026 loan growth is expected to remain in the prior guided range of 5% to 7% (mid-single digit), supported by a strong commercial loan pipeline and an expected slowdown in large commercial loan payoffs in the second half of 2026. - Net interest margin is expected to increase in the second half of 2026 compared to the first half of 2026, driven by commercial loan growth, reallocation of excess Federal Reserve deposits to higher-yielding loans, and repricing of maturing low-yielding fixed-rate commercial real estate loans and agency securities. - Maturing assets will deliver meaningful yield expansion: ~$100 million of fixed-rate commercial real estate loans (average current yield of ~4.6%) are expected to reprice to an average blended yield in the mid-6% range, and $38 million of agency bonds (current yield ~1%) are expected to reprice to ~4% when reinvested. - The full year 2026 effective federal income tax rate is projected to be 17%, reflecting expected benefits from low-income housing, historical, and transferable energy tax credits. - Non-interest expense guidance includes planned personnel investments for Southeast Michigan expansion and core conversion preparation, but excludes one-time conversion costs; core conversion cost savings are expected to begin in Q2 2027, with significant contract savings on core banking services. - The 2026 full-year forecast assumes no changes to the federal funds rate for the remainder of the year; management expects NIM to remain relatively stable regardless of moderate rate changes (25-50 basis points per quarter) due to the bank's match-funded balance sheet structure. - Between $100 million and $125 million of excess cash is expected to be reallocated from Federal Reserve deposits to higher-yielding commercial loans, largely by the end of 2026 or early 2027.

Segment performance

As a regional commercial bank, Mercantile Bank reports consolidated performance across core lending and deposit business segments with no separate segmented financial disclosure. For Q2 2026: reported net income was $25.9 million ($1.50 diluted EPS), compared to $22.6 million ($1.39 diluted EPS) in Q2 2025. Adjusted net income (excluding non-recurring acquisition and system conversion costs) was $26.4 million ($1.53 diluted EPS), representing a 10% YoY increase in adjusted diluted EPS. For the first half of 2026: reported net income totaled $48.6 million ($2.82 diluted EPS), compared to $42.2 million ($2.60 diluted EPS) in H1 2025; adjusted net income was $51.7 million ($2.99 diluted EPS), a 15% YoY increase in adjusted diluted EPS. Net interest income increased $7.8 million quarter-over-quarter and $15.1 million H1-over-H1, driven by a $699 million increase in average earning assets (to $6.43 billion) and expanded net interest margin. Non-interest income grew strongly: service charges on deposit accounts increased 35% YoY in Q2 2026, and card income grew 21% YoY in H1 2026. Non-interest expense increased $6 million QoQ and $17 million H1-over-H1; adjusted for one-time costs, core non-interest expense increased $5.4 million QoQ and $13.1 million H1-over-H1, driven by higher salaries and benefits for Southeast Michigan expansion and inflation.

Risks & headwinds

- Actual results may differ materially from forward-looking projections due to uncertain and volatile market conditions, including unexpected changes to interest rates. - Credit quality and loan loss reserve levels are highly dependent on future economic conditions; a significant economic downturn could lead to increased nonperforming loans and require sizable positive provision expenses to build reserves. - Integration of the Eastern Michigan acquisition and core/digital banking system conversion carry execution risk, including potential unexpected costs or operational disruptions. - Deposit pricing competition from credit unions and other financial institutions could impact deposit growth and deposit costs over time. - The CECL accounting framework creates structural reserve constraints for short-duration commercial loan portfolios, which may limit ability to reflect relationship-based loan renewal expectations in reserve calculations.

Analyst Q&A

• Q: How much of the recent expense increase is tied to Southeast Michigan expansion vs. core conversion, and when will core conversion savings materialize? /

  A: Most incremental core expense growth comes from ongoing Southeast Michigan expansion hiring, with additional temporary hiring for core conversion training and execution. Core conversion is scheduled to go live in February 2027, and cost savings will begin to appear starting in Q2 2027 after exiting old vendor contracts. While core contract savings are expected to be significant, overall long-term expense levels depend on continued growth, so a specific net savings figure is not yet available.

• Q: Where will the allowance for credit losses stabilize, and when might provision expense turn positive? /

  A: The allowance has ranged between 1.13% and ~1.20% of total loans for quite some time, and management expects it to remain in this range barring a significant economic downturn. The current low level of specific reserves reflects very low volumes of nonperforming loans and strong collateralization from conservative underwriting. Provision expense will only turn positive and build reserves if economic conditions deteriorate or specific nonperforming loans increase materially.

• Q: How is the core deposit competitive landscape evolving, and what are deposit growth expectations? /

  A: Deposit pricing and competition have remained fairly stable in recent months, with seasonal Q2 deposit declines driven primarily by tax payment seasonality for public and business deposit customers. Strong core deposit growth is expected in Q3 due to seasonal property tax inflows for public sector customers, and non-interest bearing deposit growth has been very strong tied to commercial and C&I loan growth. Strong local deposit growth has allowed Mercantile to exit the brokered CD market, with only $20 million remaining set to mature by the end of 2026.

• Q: How will management use its strong current capital position, and will share repurchases resume? /

  A: Management prioritizes retaining strong capital to take advantage of organic growth opportunities, expansion, and potential acquisitions, and will continue to grow capital through retained earnings while maintaining a growing competitive dividend. The outstanding subordinated notes become callable in January 2027; management is comfortable leaving the notes outstanding for at least another year, as the current floating rate spread remains favorable relative to refinancing. Share repurchases would only be considered if the board determines capital is in excess of what is needed for planned growth opportunities.

• Q: If rates rise in 2027, how would net interest margin respond? /

  A: Management has structured the balance sheet to be largely agnostic to moderate interest rate changes through match funding, which keeps the NIM relatively stable whether rates rise or fall. Yields and funding costs move in tandem with rate changes, with the investment portfolio used to bridge any remaining repricing gaps. Only very aggressive rate moves would cause material NIM changes, but moderate 25-50 basis point quarterly changes would not shift the NIM significantly.