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Oostburg State Bank

Oostburg, WI · Cert 10380 · Oostburg Bcorp Inc.

State charter, non-member · FDIC · 4 branches

Q2 2026

$440.2MAssets
$320.9MLoans
$388.4MDeposits
$47.7MEquity
Loan mix
82%RE $250.9M17%C&I $52.6M1%Consumer $2.8MQ2 2025Q2 2026
Deposit mix
75%Interest-bearing $291.1M25%Noninterest $97.2MQ2 2025Q2 2026

NIM

4.91%Q2 ’245.14%Q2 ’255.39%Q2 ’26+8%+14%

Non-interest income vs. expense

2.29%Q2 ’242.46%Q2 ’252.54%Q2 ’26+12%+1%

Financial Results

Return on Assets (YTD, annualized)

1.39%+29 bps YoY

Net Interest Margin (YTD, annualized)

3.83%+48 bps YoY

Efficiency Ratio (YTD, annualized)

59.80%-641 bps YoY

Tier 1 Leverage Ratio

11.64%-22 bps YoY

Year to date, annualized, through each quarter.

MetricQ2 2025Q3 2025Q4 2025Q1 2026Q2 2026YoY ΔTrend
Return on Assets1.10%1.19%1.12%1.21%1.39%+29 bps
Net Interest Margin3.35%3.36%3.34%3.73%3.83%+48 bps
Non-Interest Burden2.09%2.01%2.11%2.20%2.12%+3 bps
Loan Growth (YoY)7.70%8.01%9.09%12.60%12.17%+447 bps
Nonperforming Loans / Loans0.41%0.16%0.20%0.28%0.13%-28 bps
Allowance / Loans1.45%1.41%1.36%1.31%1.23%-22 bps
Tier 1 Leverage Ratio11.86%11.74%11.15%11.32%11.64%-22 bps
Equity / Assets10.76%10.82%10.34%10.54%10.83%+7 bps
Liquid Assets / Assets0.28%0.37%0.11%0.45%0.52%+24 bps