X0508 4 2024-07-12 1 0000711772 CAMBRIDGE BANCORP CATC 0001207221 SHEAHAN DENIS K C/O CAMBRIDGE BANCORP 78 BLANCHARD ROAD, SUITE 400 BURLINGTON MA 01803 1 1 0 0 Chairman and CEO 0 Common Stock 2024-07-12 4 D 0 8799 D 0 D Common Stock 2024-07-12 4 D 0 689 D 0 I ESOP Common Stock 2024-07-12 4 D 0 49285 D 0 I By Revocable Trust Disposed of pursuant to the Agreement and Plan of Merger (the "Merger Agreement") dated as of September 19, 2023, by and between Cambridge Bancorp ("Cambridge"), Cambridge Trust Company, Eastern Bankshares, Inc. ("Eastern"), Eastern Bank and Citadel MS 2023, Inc., in exchange for the right to receive (i) 16,826 shares of Eastern common stock, with a market value of $14.87 per share of Eastern common stock based on the closing price of Eastern common stock on July 12, 2024 and (ii) 26,782 Eastern restricted stock unit awards, with the same terms, restrictions and vesting schedules as such existing Cambridge restricted stock unit award. Disposed of pursuant to the Merger Agreement in exchange for the right to receive 3,415 shares of Eastern common stock, with a market value of $14.87 per share of Eastern common stock based on the closing price of Eastern common stock on July 12, 2024. Disposed of pursuant to the Merger Agreement in exchange for the right to receive 244,256 shares of Eastern common stock, with a market value of $14.87 per share of Eastern common stock based on the closing price of Eastern common stock on July 12, 2024. /s/ Joseph P. Sapienza, as Attorney-In Fact 2024-07-15