[Form 4] Brookline Bancorp Inc Insider Trading Activity

Rhea-AI Filing Summary

Form 4 filing for Brookline Bancorp (BRKL) reports insider activity by Chairman & CEO Paul A. Perrault on 08/02/2025. Four Code “F” transactions—share withholding to satisfy tax obligations upon vesting of restricted stock—reduced his direct holdings by a total of 21,637 shares at an indicated price of $10.28.

• 9,439 shares withheld → direct holdings 539,776
• 3,147 shares withheld → direct holdings 536,629
• 4,295 shares withheld → direct holdings 532,334
• 4,756 shares withheld → direct holdings 527,578

After the transactions Perrault owns 527,578 direct shares plus 4,163 shares via ESOP and 75,000 shares via GRAT #3. The activity stems from performance-based restricted stock granted under the company’s 2021 Stock Option & Incentive Plan; no open-market buying or selling occurred. As the moves are routine tax-related withholdings and the CEO retains a substantial stake (>606 k total shares), the filing carries limited implication for Brookline Bancorp’s fundamentals.

Insights

Corporate Governance Analyst

TL;DR – Routine tax-withholding; neutral signal.

The Code F classification confirms these share disposals were automatic to cover taxes on vested performance RSUs, not discretionary sales. Perrault still controls roughly 1.2 % of outstanding shares, maintaining alignment with shareholders. Because there is no open-market activity, dilution, or change in incentive structure, I view the impact on valuation and sentiment as negligible.

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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hours per response:			0.5

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^*

PERRAULT PAUL A

(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)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chairman & CEO

3. Date of Earliest Transaction (Month/Day/Year)
08/02/2025

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	08/02/2025		F		9,439(1)	D	$10.28	539,776	D
Common	08/02/2025		F		3,147	D	$10.28	536,629	D
Common	08/02/2025		F		4,295	D	$10.28	532,334	D
Common	08/02/2025		F		4,756	D	$10.28	527,578(2)	D
Common								4,163	I	By ESOP
Common								75,000	I	By Paul A. Perrault GRAT #3

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. Performance based restricted stock shares granted pursuant to the Brookline Bancorp, Inc. 2021 Stock Option and Incentive Plan. The shares vest on the third anniversary of the date of grant based on certain performance based metrics.

2. Includes shares of restricted stock granted pursuant to the Brookline Bancorp, Inc. 2021 Stock Option and Incentive Plan.

Remarks:

	Paul A. Perrault, by Marissa S. Martin, P.O.A.	08/05/2025
	** 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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

How many Brookline Bancorp shares does CEO Paul Perrault now own?

He holds 527,578 direct shares, plus 4,163 ESOP and 75,000 GRAT shares.

What type of transactions were reported in BRKL's August 2025 Form 4?

All four transactions were Code F—shares withheld to pay taxes on restricted-stock vesting.

Were the shares sold on the open market?

No. Code F indicates no open-market sales; the issuer withheld shares for tax purposes.

At what price were the shares valued for tax withholding?

The shares were valued at $10.28 per share for all four withholding events.

Does this Form 4 signal any change in Brookline Bancorp’s outlook?

The filing appears routine and neutral; it does not reflect the CEO’s view on the company’s prospects.