[Form 4] Brookline Bancorp Inc Insider Trading Activity

Rhea-AI Filing Summary

Mark J. Meiklejohn, Chief Credit Officer of Brookline Bancorp Inc. (BRKL), reported a disposition of 101,003 common shares on 09/01/2025. The Form 4 shows the sale was not a market trade but resulted from the merger implementation: each Brookline share was converted into the right to receive 0.42 shares of Berkshire Hills Bancorp, Inc. common stock, with cash paid in lieu for any fractional shares. Following the reported transaction the filing lists 0 shares beneficially owned by the reporting person. The form is signed by Mark J. Meiklejohn via power of attorney on 09/02/2025.

Insights

Financial Analyst

TL;DR: Insider ownership in BRKL converted into Berkshire Hills stock under merger; 101,003 BRKL shares disposed on 09/01/2025.

The Form 4 documents a non-market disposition of 101,003 Brookline shares due to the merger exchange described in the explanatory note. The filing explicitly states the conversion rate of 0.42 Berkshire shares per Brookline share and cash in lieu for fractional shares. This is a post-closing mechanics filing rather than a voluntary sale, and the reporter’s beneficial position is shown as 0 shares following the transaction. For analysts, this is a clear record of ownership conversion tied to a corporate transaction rather than a signal of independent trading intent.

Corporate Governance Expert

TL;DR: Form 4 records mandatory conversion under merger; no remaining Brookline holdings reported by the officer.

The submission identifies Mark J. Meiklejohn as an officer (Chief Credit Officer) and records disposition of all reported Brookline common shares through the merger mechanism. The explanatory remarks reference the Agreement and Plan of Merger with Berkshire Hills Bancorp, Inc., specifying the 0.42 share conversion and cash for fractional interests. From a governance perspective, this filing documents organizational ownership changes resulting from a completed corporate action and shows proper disclosure timing with a signature via power of attorney dated 09/02/2025.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Meiklejohn Mark J.

(Last) (First) (Middle)

131 CLARENDON STREET

(Street)

BOSTON MA 02116

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
BROOKLINE BANCORP INC [ BRKL ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Credit Officer

3. Date of Earliest Transaction (Month/Day/Year)
09/01/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common	09/01/2025		D		101,003	D	(1)	0	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Pursuant to the terms of the Agreement and Plan of Merger by and among Berkshire Hills Bancorp, Inc. (Berkshire) , Commerce Acquisition Sub, Inc. and Brookline Bancorp, Inc. (the Issuer), on September 1, 2025, each share of Issuer common stock was converted into the right to receive 0.42 shares of Berkshire common stock and cash in lieu of any fractional share of Berkshire common stock.

Remarks:

	Mark J. Meiklejohn, by Marissa S. Martin, P.O.A.	09/02/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
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