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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 $0.0BQ3 2024Q2 2026
Deposit mix
82%Interest-bearing $1.1B18%Noninterest $0.3BQ3 2024Q2 2026

Return on Assets (YTD, annualized)

0.63%-3 bps YoY

Net Interest Margin (YTD, annualized)

2.81%+21 bps YoY

Efficiency Ratio (YTD, annualized)

73.44%-257 bps YoY

Tier 1 Leverage Ratio

12.04%+97 bps YoY

NIM

4.89%Q2 ’244.86%Q2 ’254.77%Q2 ’26+6%+8%

Non-interest income vs. expense

2.05%Q2 ’242.19%Q2 ’252.44%Q2 ’26-2%+1%

Year to date, annualized, through each quarter.

MetricQ3 2024Q4 2024Q1 2025Q2 2025Q3 2025Q4 2025Q1 2026Q2 2026YoY ΔTrend
Return on Assets0.43%0.49%0.71%0.66%0.70%0.63%0.53%0.63%-3 bps
Net Interest Margin2.49%2.47%2.52%2.60%2.60%2.73%2.85%2.81%+21 bps
Non-Interest Burden2.01%1.95%1.91%2.00%1.93%1.99%2.24%2.03%+3 bps
Loan Growth (YoY)-0.74%-3.65%-0.45%-1.97%-2.34%-4.07%-4.41%-5.14%-318 bps
Nonperforming Loans / Loans0.36%0.83%0.84%0.55%0.50%0.90%1.66%1.69%+114 bps
Allowance / Loans0.97%0.94%0.87%0.84%0.77%0.92%0.92%0.90%+5 bps
Tier 1 Leverage Ratio10.48%10.61%10.63%11.07%11.44%11.80%12.06%12.04%+97 bps
Equity / Assets9.41%9.46%9.66%9.47%10.52%10.63%11.17%11.03%+156 bps
Liquid Assets / Assets1.05%0.67%2.76%2.59%1.18%3.34%1.41%1.80%-79 bps