Steven Louis Antonakes - 01 Mar 2026 Form 4 Insider Report for Eastern Bankshares, Inc. (EBC)

Role: Executive VP
Signature: /s/ Kathleen R. Henry, by Power of Attorney
Issuer symbol: EBC
Transactions as of: 01 Mar 2026
Net transactions value: -$100,812
Form type: 4
Filing time: 03 Mar 2026, 16:34:36 UTC
Previous filing: 29 Aug 2025
Next filing: 05 Mar 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Antonakes Steven Louis	Executive VP	125 HIGH STREET, BOSTON	/s/ Kathleen R. Henry, by Power of Attorney	03 Mar 2026	0001825588

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	EBC	Common Stock	Options Exercise	$0	+12,788	+21%	$0.000000	74,206	01 Mar 2026	Direct	F1
transaction	EBC	Common Stock	Tax liability	$76,969	-3,935	-5.3%	$19.56	70,271	01 Mar 2026	Direct
transaction	EBC	Common Stock	Award	$0	+4,150	+5.9%	$0.000000	74,421	01 Mar 2026	Direct	F9
transaction	EBC	Common Stock	Tax liability	$23,844	-1,219	-1.6%	$19.56	73,202	01 Mar 2026	Direct
holding	EBC	Common Stock						13,109	01 Mar 2026	By 401(k)	F2
holding	EBC	Common Stock						4,921	01 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	$0	-9,488	-50%	$0.000000	9,488	01 Mar 2026	Common stock	9,488		Direct	F1, F4
transaction	EBC	Restricted Stock Units	Options Exercise	$0	-1,487	-100%	$0.000000	0	01 Mar 2026	Common stock	1,487		Direct	F1, F5
transaction	EBC	Restricted Stock Units	Options Exercise	$0	-1,813	-50%	$0.000000	1,814	01 Mar 2026	Common stock	1,813		Direct	F1, F6
transaction	EBC	Restricted Stock Units	Award	$0	+4,629		$0.000000	4,629	02 Mar 2026	Common stock	4,629		Direct	F3, F8
holding	EBC	Restricted Stock Units						33,163	01 Mar 2026	Common stock	33,163		Direct	F1, F7

* 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	Each restricted stock unit represents a contingent right to receive one share of EBC common stock on the applicable vesting date.
F4	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.
F5	On March 1, 2023, the reporting person was granted 4,458 restricted stock units that vest in three equal annual installments beginning March 1, 2024, subject to continued service. Vested shares will be issued to the reporting person as soon as practicable after the vesting date.
F6	On March 1, 2024, the reporting person was granted 5,439 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.
F7	On March 3, 2025, the reporting person was granted 33,163 restricted stock units of which 4,963 vest in three equal annual installments beginning March 3, 2026 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.
F8	On March 2, 2026, the reporting person was granted 4,629 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.
F9	Represents shares of Eastern Bankshares, Inc. (the "Company") common stock, par value $0.01 per share ("Common Stock") received upon vesting of a performance restricted stock unit ("PRSU") award eligible to vest based upon the Company's performance on total shareholder return ("TSR") measured at the end of the three-year performance period of January 1, 2023 through December 31, 2025 (the "Performance Period") relative to TSR performance over that performance period of the banks listed on the KBW Nasdaq Regional Banking Index (the "TSR Measure"). The Compensation and Human Capital Management Committee determined that the Company's performance of the TSR Measure resulted in a payout of 93.1% of target.