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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 $3.1MQ2 2025Q2 2026
Deposit mix
90%Interest-bearing $291.4M10%Noninterest $32.5MQ2 2025Q2 2026

NIM

4.88%Q2 ’245.27%Q2 ’255.30%Q2 ’26+32%+11%

Non-interest income vs. expense

2.26%Q2 ’242.48%Q2 ’252.69%Q2 ’26+15%+8%

Financial Results

Return on Assets (quarter, annualized)

0.49%+14 bps YoY

Net Interest Margin (quarter, annualized)

3.02%+31 bps YoY

Efficiency Ratio (quarter, annualized)

78.47%-204 bps YoY

Tier 1 Leverage Ratio

8.76%+4 bps YoY

Discrete quarter, annualized.

MetricQ2 2025Q3 2025Q4 2025Q1 2026Q2 2026YoY ΔTrend
Return on Assets0.34%0.44%0.56%0.29%0.49%+14 bps
Net Interest Margin2.71%2.69%2.79%2.90%3.02%+31 bps
Non-Interest Burden2.11%2.07%2.03%2.20%2.29%+17 bps
Loan Growth (YoY)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 bps
Allowance / Loans1.09%1.15%1.14%1.12%1.15%+6 bps
Tier 1 Leverage Ratio8.72%8.76%8.73%8.71%8.76%+4 bps
Equity / Assets5.95%6.52%6.75%6.61%6.73%+78 bps
Liquid Assets / Assets11.94%12.92%11.87%11.45%12.76%+82 bps