Denis K. Sheahan - 16 Sep 2025 Form 4 Insider Report for Eastern Bankshares, Inc. (EBC)

Role: Chief Executive Officer, Director
Signature: /s/ Kathleen R. Henry, by Power of Attorney
Issuer symbol: EBC
Transactions as of: 16 Sep 2025
Net transactions value: -$13.85
Form type: 4
Filing time: 03 Mar 2026, 18:01:22 UTC
Previous filing: 04 Sep 2025
Next filing: 05 Mar 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
SHEAHAN DENIS K	Chief Executive Officer, Director	125 HIGH STREET, BOSTON	/s/ Kathleen R. Henry, by Power of Attorney	03 Mar 2026	0001207221

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	EBC	Common Stock	Sale	$13.85	-1	-0%	$13.85	33,305	16 Sep 2025	By IRA	F12
holding	EBC	Common Stock						250,781	16 Sep 2025	By Revocable Trust
holding	EBC	Common Stock						889	16 Sep 2025	By ESOP	F13

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	EBC	Restricted Stock Units	Award	$0	+24,340		$0.000000	24,340	02 Mar 2026	Common stock	24,340		Direct	F8, F11
holding	EBC	Restricted Stock Units						3,232	16 Sep 2025	Common stock	3,232		Direct	F1, F2, F3
holding	EBC	Restricted Stock Units						11,241	16 Sep 2025	Common stock	11,241		Direct	F1, F2, F4
holding	EBC	Restricted Stock Units						34,544	16 Sep 2025	Common stock	34,544		Direct	F1, F2, F5
holding	EBC	Restricted Stock Units						33,721	16 Sep 2025	Common stock	33,721		Direct	F1, F2, F6
holding	EBC	Restricted Stock Units						42,221	16 Sep 2025	Common stock	42,221		Direct	F1, F2, F7
holding	EBC	Restricted Stock Units						25,821	16 Sep 2025	Common stock	25,821		Direct	F8, F9
holding	EBC	Restricted Stock Units						154,088	16 Sep 2025	Common stock	154,088		Direct	F8, F10

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Eastern Bankshares, Inc. (the "Company") issued these time-based restricted stock units ("RSUs") as of July 12, 2024, when the Company completed a merger with Cambridge Bancorp ("Cambridge"). Pursuant to the terms of the Agreement and Plan of Merger, dated September 19, 2023, Cambridge RSUs and performance-based restricted stock units ("PRSUs") were assumed and converted to Company RSUs at an exchange ratio of 4.956 Company units for each Cambridge unit.
F2	Restricted stock units convert into common stock on a one-for-one basis.
F3	This award for 3,232 Company RSUs replaced an award of Cambridge RSUs granted to the reporting person on February 15, 2021, that vested in three equal annual installments beginning one year after the grant date. The reporting person elected to defer receipt of common stock issuable upon the vesting of these RSUs.
F4	This award for 11,241 Company RSUs replaced an award of Cambridge RSUs granted to the reporting person on February 15, 2022, that provided for vesting in three equal annual installments beginning one year after the grant date. The final tranche of this Company RSU award vested on February 15, 2025. The reporting person elected to defer receipt of common stock issuable upon vesting except for shares withheld for tax obligations.
F5	This award for 34,544 Company RSUs replaced an award of Cambridge RSUs granted to the reporting person on April 28, 2023, that provided for vesting in three equal annual installments beginning one year after the grant date. Subject to continued service, the remaining tranches will vest on April 28 of 2025 and 2026, respectively. The reporting person elected to defer receipt of common stock issuable upon vesting except for shares withheld for tax obligations.
F6	This award for 33,721 Company RSUs replaced an award of Cambridge PRSUs granted to the reporting person on February 15, 2022. The Company RSU award provided for cliff vesting on December 31, 2024. The reporting person elected to defer receipt of common stock issuable upon vesting except for shares withheld for tax obligations.
F7	This award for 42,221 Company RSUs replaced an award of Cambridge PRSUs that Cambridge granted to the reporting person on April 28, 2023. Subject to continued service, the Company RSU award provides for cliff vesting on December 31, 2025. The reporting person elected to defer receipt of common stock issuable upon vesting except for shares withheld for tax obligations.
F8	Each restricted stock unit represents a contingent right to receive one share of Company common stock on the applicable vesting date.
F9	On September 3, 2024, the reporting person was granted 25,821 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.
F10	On March 3, 2025, the reporting person was granted 154,088 restricted stock units of which 24,365 vest in three equal annual installments beginning March 3, 2026 and 129,723 vest in five equal installments beginning on March 3, 2026, subject to continued service. Vested shares will be issued to the reporting person as soon as practicable after the vesting date.
F11	On March 2, 2026, the reporting person was granted 24,340 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.
F12	Sale of fractional shares by transfer agent in connection with the transfer of shares to a brokerage account.
F13	Reflects the amount of shares beneficially owned, including shares received due to automatic dividend reinvestment, as of the date of this report.