Investor Presentaiton

| Appendix: Interest Rate Risk Profile (As of March 31, 2021) Net Interest Income (NII) Sensitivity Immediate Parallel Shock - Year 1 Ramps/ Yield Curve Twist - Year 1 Down 100 Up 100 Up 200 Up 300 Up 400 Down 100 Up 200 Yield Curve Twist 8.0% 8.0% 5.1% 4.0% 3.2% 4.0% 1.3% 0.5% 0.9% 0.0% 0.0% (0.5%) -4.0% (0.8%) -4.0% (4.7%) -8.0% -8.0% CAMBRIDGE BANCORP 25 25

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