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Letter portraitLegal landscapeQuarterYTD

Bank of Mauston

Mauston, WI · Cert 12327 · Mauston Bcorp Inc.

State charter, non-member · FDIC · 6 branches

Q2 2026

$426.7MAssets
$247.8MLoans
$367.7MDeposits
$57.2MEquity
Loan mix
87%RE $211.1M11%C&I $26.1M2%Consumer $4.4MQ3 2024Q2 2026
Deposit mix
87%Interest-bearing $318.1M13%Noninterest $49.6MQ3 2024Q2 2026

Return on Assets (quarter, annualized)

2.26%+16 bps YoY

Net Interest Margin (quarter, annualized)

3.67%+17 bps YoY

Efficiency Ratio (quarter, annualized)

35.49%-232 bps YoY

Tier 1 Leverage Ratio

14.75%+62 bps YoY

NIM

4.66%Q2 ’245.11%Q2 ’255.24%Q2 ’26+31%+5%

Non-interest income vs. expense

1.52%Q2 ’241.61%Q2 ’251.61%Q2 ’26+29%-12%

Discrete quarter, annualized.

MetricQ3 2024Q4 2024Q1 2025Q2 2025Q3 2025Q4 2025Q1 2026Q2 2026YoY ΔTrend
Return on Assets1.55%1.33%1.72%2.10%2.01%2.21%1.78%2.26%+16 bps
Net Interest Margin2.73%3.02%3.15%3.50%3.58%3.09%3.39%3.67%+17 bps
Non-Interest Burden0.82%1.33%1.00%0.86%0.99%0.14%1.10%0.76%-10 bps
Loan Growth (YoY)1.89%3.37%4.29%2.38%3.02%6.12%3.04%1.78%-60 bps
Nonperforming Loans / Loans0.00%0.00%0.01%0.01%0.01%0.01%0.01%0.19%+19 bps
Allowance / Loans2.00%1.98%1.96%1.92%1.94%1.87%1.90%1.88%-4 bps
Tier 1 Leverage Ratio12.93%13.44%13.71%14.13%14.67%14.91%14.32%14.75%+62 bps
Equity / Assets11.85%12.02%12.65%12.88%13.26%12.70%13.22%13.40%+52 bps
Liquid Assets / Assets40.77%39.69%38.14%37.43%38.24%37.83%35.81%32.77%-466 bps