X0508 4 2024-07-12 1 0000711772 CAMBRIDGE BANCORP CATC 0001947489 Walsh Jane C. C/O CAMBRIDGE BANCORP 78 BLANCHARD ROAD, SUITE 400 BURLINGTON MA 01803 1 0 0 0 0 Common Stock 2024-07-12 4 D 0 105278 D 0 D Common Stock 2024-07-12 4 D 0 5482 D 0 I Trustee for Walsh Family Educational Trust (A) Common Stock 2024-07-12 4 D 0 5482 D 0 I Trustee for Walsh Family Educational Trust (B) Common Stock 2024-07-12 4 D 0 17437 D 0 I By Spouse 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 521,758 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 27,169 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 86,418 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