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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 $4.4MQ2 2025Q2 2026
Deposit mix
87%Interest-bearing $318.1M13%Noninterest $49.6MQ2 2025Q2 2026

NIM

4.59%Q2 ’245.02%Q2 ’255.15%Q2 ’26+29%+6%

Non-interest income vs. expense

1.59%Q2 ’241.69%Q2 ’251.83%Q2 ’26+16%+0%

Financial Results

Return on Assets (YTD, annualized)

2.02%+11 bps YoY

Net Interest Margin (YTD, annualized)

3.54%+21 bps YoY

Efficiency Ratio (YTD, annualized)

41.17%-17 bps YoY

Tier 1 Leverage Ratio

14.75%+62 bps YoY

Year to date, annualized, through each quarter.

MetricQ2 2025Q3 2025Q4 2025Q1 2026Q2 2026YoY ΔTrend
Return on Assets1.90%1.94%2.01%1.78%2.02%+11 bps
Net Interest Margin3.33%3.44%3.37%3.39%3.54%+21 bps
Non-Interest Burden0.93%0.96%0.76%1.10%0.93%0 bps
Loan Growth (YoY)2.38%3.02%6.12%3.04%1.78%-60 bps
Nonperforming Loans / Loans0.01%0.01%0.01%0.01%0.19%+19 bps
Allowance / Loans1.92%1.94%1.87%1.90%1.88%-4 bps
Tier 1 Leverage Ratio14.13%14.67%14.91%14.32%14.75%+62 bps
Equity / Assets12.88%13.26%12.70%13.22%13.40%+52 bps
Liquid Assets / Assets37.43%38.24%37.83%35.81%32.77%-466 bps