Joseph F. Casey - 01 Nov 2025 Form 3 Insider Report for Eastern Bankshares, Inc. (EBC)

Role: Director
Signature: /s/ Kathleen R. Henry, by Power of Attorney
Issuer symbol: EBC
Transactions as of: 01 Nov 2025
Net transactions value: $0
Form type: 3
Filing time: 10 Nov 2025, 16:10:06 UTC
Previous filing: 04 Mar 2025
Next filing: 01 Dec 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
CASEY JOSEPH F	Director	125 HIGH STREET, BOSTON	/s/ Kathleen R. Henry, by Power of Attorney	10 Nov 2025	0001221397

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
holding	EBC	Common Stock						36,112	01 Nov 2025	Direct	F1
holding	EBC	Common Stock						107,160	01 Nov 2025	By Spouse	F1
holding	EBC	Common Stock						83,962	01 Nov 2025	By Trust	F1
holding	EBC	Common Stock						19,732	01 Nov 2025	Rollover IRA	F1
holding	EBC	Common Stock						24,772	01 Nov 2025	Traditional IRA	F1
holding	EBC	Common Stock						11,704	01 Nov 2025	ESOP	F1
holding	EBC	Common Stock						43,192	01 Nov 2025	401(k)	F1

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
holding	EBC	Stock Option (Right to Buy)							01 Nov 2025	Common Stock	118,947	$11.74	Direct	F2, F3, F4
holding	EBC	Stock Option (Right to Buy)							01 Nov 2025	Common Stock	101,912	$12.80	Direct	F2, F3, F4
holding	EBC	Stock Option (Right to Buy)							01 Nov 2025	Common Stock	101,912	$13.38	Direct	F2, F3, F4

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

Explanation of Responses:

Id	Content
F1	Pursuant to the terms of the Agreement and Plan of Merger dated April 24, 2025 among Eastern Bankshares, Inc. ("Eastern"), Eastern Bank, HarborOne Bancorp, Inc. (HarborOne"), and HarborOne Bank (the "Merger Agreement"), upon the merger of HarborOne into Eastern, effective November 1, 2025 (the "Merger"), each share of HarborOne common stock was converted into the right to receive, at the election of the holder, either (i) $12.00 in cash or (ii) 0.765 shares of Eastern common stock (the "Exchange Ratio"), subject to certain proration provisions contained in the Merger Agreement.
F2	Pursuant to the terms of the Merger Agreement, the stock option must be exercised within no later than February 1, 2026 (i.e., three (3) months from the time reporting person's employment as an executive of HarborOne was terminated).
F3	Pursuant to the Merger Agreement, each outstanding and unexercised option to purchase shares of HarborOne common stock was converted into an option to purchase shares of Eastern common stock by multiplying the number of shares by the Exchange Ratio (rounded down to the nearest whole share).
F4	Pursuant to the Merger Agreement, the exercise price per share of each converted option was determined by dividing the exercise price of the HarborOne stock option by the Exchange Ratio (rounded up to the nearest whole cent).