Donald Michael Westermann - 03 Mar 2026 Form 4 Insider Report for Eastern Bankshares, Inc. (EBC)

Role: Chief Information Officer
Signature: /s/ Kathleen R. Henry, by Power of Attorney
Issuer symbol: EBC
Transactions as of: 03 Mar 2026
Net transactions value: $0
Form type: 4
Filing time: 05 Mar 2026, 16:41:36 UTC
Previous filing: 03 Mar 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Westermann Donald Michael	Chief Information Officer	125 HIGH STREET, BOSTON	/s/ Kathleen R. Henry, by Power of Attorney	05 Mar 2026	0001825585

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	EBC	Common Stock	Options Exercise		+2,165	+6.8%	$0.000000^*	33,933	03 Mar 2026	Direct	F1
transaction	EBC	Common Stock	Tax liability		-961	-2.8%	$19.45^*	32,972	03 Mar 2026	Direct
holding	EBC	Common Stock						22,682	03 Mar 2026	By 401(k)	F2
holding	EBC	Common Stock						4,921	03 Mar 2026	By ESOP	F2

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	Options Exercise		-2,165	-6.2%	$0.000000^*	32,532	03 Mar 2026	Common stock	2,165		Direct	F1, F5
holding	EBC	Restricted Stock Units						9,488	03 Mar 2026	Common stock	9,488		Direct	F1, F3
holding	EBC	Restricted Stock Units						2,895	03 Mar 2026	Common stock	2,895		Direct	F1, F4
holding	EBC	Restricted Stock Units						7,099	03 Mar 2026	Common stock	7,099		Direct	F1, F6

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

Explanation of Responses:

Id	Content
F1	Restricted stock units convert into common stock on a one-for-one basis.
F2	Reflects the amount of shares beneficially owned, including shares received due to automatic dividend reinvestment, as of the date of this report.
F3	On March 1, 2022, the reporting person was granted 47,438 restricted stock units that vest in five equal annual installments beginning March 1, 2023, subject to continued service. Vested shares will be issued to the reporting person as soon as practicable after the vesting date.
F4	On March 1, 2024, the reporting person was granted 8,683 restricted stock units that vest in three equal annual installments beginning March 1, 2025, subject to continued service. Vested shares will be issued to the reporting person as soon as practicable after the vesting date.
F5	On March 3, 2025, the reporting person was granted 34,697 restricted stock units of which 6,497 vest in three equal annual installments beginning March 3, 2026, after market close, and 28,200 vest after 3 years, subject to continued service. Vested shares will be issued to the reporting person as soon as practicable after the vesting date.
F6	On March 2, 2026, the reporting person was granted 7,099 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.