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Main Street Bank

Marlborough, MA · Cert 90235 · Main Street Group Bancshares MHC

SI · FDIC · 6 branches

Q2 2026

$1.7BAssets
$1.3BLoans
$1.4BDeposits
$183.7MEquity
Loan mix
91%RE $1.2B8%C&I $0.1B1%Consumer $0.0BQ2 2025Q2 2026
Deposit mix
82%Interest-bearing $1.1B18%Noninterest $0.3BQ2 2025Q2 2026

NIM

4.87%Q2 ’244.82%Q2 ’254.81%Q2 ’26+7%+8%

Non-interest income vs. expense

2.07%Q2 ’242.25%Q2 ’252.49%Q2 ’26+17%-9%

Financial Results

Return on Assets (quarter, annualized)

0.73%+11 bps YoY

Net Interest Margin (quarter, annualized)

2.83%+20 bps YoY

Efficiency Ratio (quarter, annualized)

70.01%-722 bps YoY

Tier 1 Leverage Ratio

12.04%+97 bps YoY

Discrete quarter, annualized.

MetricQ2 2025Q3 2025Q4 2025Q1 2026Q2 2026YoY ΔTrend
Return on Assets0.62%0.77%0.44%0.53%0.73%+11 bps
Net Interest Margin2.63%2.73%2.99%2.85%2.83%+20 bps
Non-Interest Burden2.05%1.91%2.05%2.24%1.86%-19 bps
Loan Growth (YoY)-1.97%-2.34%-4.07%-4.41%-5.14%-318 bps
Nonperforming Loans / Loans0.55%0.50%0.90%1.66%1.69%+114 bps
Allowance / Loans0.84%0.77%0.92%0.92%0.90%+5 bps
Tier 1 Leverage Ratio11.07%11.44%11.80%12.06%12.04%+97 bps
Equity / Assets9.47%10.52%10.63%11.17%11.03%+156 bps
Liquid Assets / Assets2.59%1.18%3.34%1.41%1.80%-79 bps