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Frontier Bank

Sioux Falls, SD · Cert 33922 · Rock Rivers Bcorp

State savings bank · OCC · 5 branches

Q2 2026

$349.2MAssets
$241.5MLoans
$323.8MDeposits
$23.5MEquity
Loan mix
91%RE $183.8M7%C&I $14.3M2%Consumer $3.1MQ3 2024Q2 2026
Deposit mix
90%Interest-bearing $291.4M10%Noninterest $32.5MQ3 2024Q2 2026

Return on Assets (YTD, annualized)

0.39%+4 bps YoY

Net Interest Margin (YTD, annualized)

2.96%+42 bps YoY

Efficiency Ratio (YTD, annualized)

78.77%-332 bps YoY

Tier 1 Leverage Ratio

8.76%+4 bps YoY

NIM

4.82%Q2 ’245.04%Q2 ’255.23%Q2 ’26+23%+16%

Non-interest income vs. expense

2.20%Q2 ’242.41%Q2 ’252.66%Q2 ’26+16%+11%

Year to date, annualized, through each quarter.

MetricQ3 2024Q4 2024Q1 2025Q2 2025Q3 2025Q4 2025Q1 2026Q2 2026YoY ΔTrend
Return on Assets0.33%0.37%0.36%0.35%0.38%0.43%0.29%0.39%+4 bps
Net Interest Margin2.12%2.19%2.44%2.54%2.59%2.61%2.90%2.96%+42 bps
Non-Interest Burden1.81%1.79%1.97%2.02%2.03%2.01%2.20%2.24%+23 bps
Loan Growth (YoY)3.58%3.29%6.53%15.76%11.79%8.54%7.32%1.57%-1,419 bps
Nonperforming Loans / Loans0.00%0.00%0.00%0.00%0.00%0.00%0.00%0.00%0 bps
Allowance / Loans1.19%1.14%1.10%1.09%1.15%1.14%1.12%1.15%+6 bps
Tier 1 Leverage Ratio8.93%9.07%8.94%8.72%8.76%8.73%8.71%8.76%+4 bps
Equity / Assets6.51%6.15%6.13%5.95%6.52%6.75%6.61%6.73%+78 bps
Liquid Assets / Assets16.44%12.54%12.49%11.94%12.92%11.87%11.45%12.76%+82 bps