X0609 4 2026-09-03 0001810546 Eastern Bankshares, Inc. EBC 0001605452 Rosato R David false 125 HIGH STREET BOSTON MA 02110 false true false false Chief Financial Officer false Common Stock 2026-09-03 4 M false 11356 0 A 22088 D Common Stock 2026-09-03 4 F false 3354 22.08 D 18734 D Common Stock 50000 I By Spouse in Trust Restricted Stock Units 2026-09-03 4 M false 11356 0 D Common stock 11356 11358 D Restricted Stock Units Common stock 8273 8273 D Restricted Stock Units Common stock 11156 11156 D Restricted stock units convert into common stock on a one-for-one basis. On September 3, 2024, the reporting person was granted 34,070 restricted stock units that vest in three equal annual installments beginning September 3, 2025, subject to continued service. Vested shares will be issued to the reporting person as soon as practicable after the vesting date. On March 3, 2025, the reporting person was granted 12,408 restricted stock units that vest in three equal annual installments beginning March 3, 2026, after market close, subject to continued service. Vested shares will be issued to the reporting person as soon as practicable after the vesting date. On March 2, 2026, the reporting person was granted 11,156 restricted stock units that vest in three equal annual installments beginning March 2, 2027, subject to continued service. Vested shares will be issued to the reporting person as soon as practicable after the vesting date. /s/ Laura Vaughn Burek, by Power of Attorney 2026-09-04