X0508 4 2024-07-12 1 0000711772 CAMBRIDGE BANCORP CATC 0001959578 Mead Steven J. C/O CAMBRIDGE BANCORP 78 BLANCHARD ROAD, SUITE 400 BURLINGTON MA 01803 0 1 0 0 SVP, Head of Commercial Serv. 0 Common Stock 2024-07-12 4 D 0 2938 D 0 D Common Stock 2024-07-12 4 D 0 838 D 0 I ESOP 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) 7,117 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, (ii) 496 Eastern restricted stock awards and (iii) 6,948 Eastern restricted stock unit awards, and in the case of (ii) and (iii), with the same terms, restrictions and vesting schedules as such existing Cambridge restricted stock award and Cambridge restricted stock unit award, respectively. Disposed of pursuant to the Merger Agreement in exchange for the right to receive 4,154 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