Michael James Sullivan - Nov 25, 2025 Form 4 Insider Report for Eastern Bankshares, Inc. (EBC)

Role: Director
Signature: /s/ Kathleen R. Henry, by Power of Attorney
Stock symbol: EBC
Transactions as of: Nov 25, 2025
Transactions value $: $183,252
Form type: 4
Date filed: 11/25/2025, 04:05 PM
Previous filing: Nov 3, 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Sullivan Michael James	Director	125 HIGH STREET, BOSTON	/s/ Kathleen R. Henry, by Power of Attorney	2025-11-25	0001676055

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	* Price $	Shares After	Date	Ownership
transaction	EBC	Common Stock	Options Exercise	$183K	+13.7K	$13.38	13.7K	Nov 25, 2025	Direct
holding	EBC	Common Stock					78.3K	Nov 25, 2025	Direct
holding	EBC	Common Stock					707	Nov 25, 2025	Held By Double Eagle LLC

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	Stock Option (Right to Buy)	Options Exercise	$0	-13.7K	-21.5%	$0.00	50K	Nov 25, 2025	Common Stock	63.7K	$13.38	Direct	F1

* 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, upon the merger of HarborOne into Eastern, effective November 1, 2025, the stock option must be exercised no later than May 1, 2026 (i.e., six (6) months from the time reporting person's employment as a director of HarborOne was terminated).

Content

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, upon the merger of HarborOne into Eastern, effective November 1, 2025, the stock option must be exercised no later than May 1, 2026 (i.e., six (6) months from the time reporting person's employment as a director of HarborOne was terminated).