NB Bancorp (NBBK) director reports holdings after Provident merger

NB Bancorp, Inc. (NBBK) director beneficial ownership has been reported in connection with the merger of Provident Bancorp, Inc. into Needham, effective November 15, 2025.

Rhea-AI Filing Summary

NB Bancorp, Inc. (NBBK) director beneficial ownership has been reported in connection with the merger of Provident Bancorp, Inc. into Needham, effective November 15, 2025. The reporting person holds 12,012 shares of NB Bancorp common stock directly, 36,465 shares indirectly through a revocable trust, and 2,398 shares indirectly through an ESOP. Under the merger agreement, each share of Provident common stock was converted into the right to receive either $13.00 in cash or 0.691 shares of Needham common stock, subject to proration and allocation terms in the merger agreement.

Insider Trade Summary

3 transactions reported

Mixed 3 txns

Insider Reilly Joseph B

Role Director

Type	Security	Shares	Price	Value
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 12,012 shares (Direct); Common Stock — 36,465 shares (Indirect, By Revocable Trust); Common Stock — 2,398 shares (Indirect, By ESOP)

Footnotes (2)

1. F1. Pursuant to the terms of the Agreement and Plan of Merger, dated June 5, 2025, among NB Bancorp, Inc. ("Needham"), Needham Bank, 1828 MS, Inc., Provident Bancorp, Inc., ("Provident") and BankProv (the "Merger Agreement"), upon the merger of Provident into Needham, effective November 15, 2025 (the "Merger"), each share of Provident common stock was converted into the right to receive, at the election of the holder, either (i) $13.00 in cash or (ii) 0.691 shares of Needham common stock (the "Exchange Ratio"), subject to certain proration and allocation provisions contained in the Merger Agreement.
2. F2. Pursuant to the terms of the Merger Agreement, each share of Provident common stock was converted into the right to receive, at the election of the holder, (i) $13.00 in cash, or (ii) the Exchange Ratio, subject to certain proration and allocation provisions contained in the Merger Agreement.

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Accepted by SEC EDGAR 11/25/2025 - 12:00 PM EST Learn about SEC filing dates

SEC Form 3

FORM 3

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

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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:			3235-0104
Estimated average burden
hours per response:			0.5

1. Name and Address of Reporting Person^*

Reilly Joseph B

(Last) (First) (Middle)

1063 GREAT PLAIN AVE

(Street)

NEEDHAM MA 02492

(City) (State) (Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
11/15/2025

3. Issuer Name and Ticker or Trading Symbol
NB Bancorp, Inc. [ NBBK ]

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

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

5. 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 Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	12,012	D(1)
Common Stock	36,465	I(2)	By Revocable Trust
Common Stock	2,398	I	By ESOP

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	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, dated June 5, 2025, among NB Bancorp, Inc. ("Needham"), Needham Bank, 1828 MS, Inc., Provident Bancorp, Inc., ("Provident") and BankProv (the "Merger Agreement"), upon the merger of Provident into Needham, effective November 15, 2025 (the "Merger"), each share of Provident common stock was converted into the right to receive, at the election of the holder, either (i) $13.00 in cash or (ii) 0.691 shares of Needham common stock (the "Exchange Ratio"), subject to certain proration and allocation provisions contained in the Merger Agreement.

2. Pursuant to the terms of the Merger Agreement, each share of Provident common stock was converted into the right to receive, at the election of the holder, (i) $13.00 in cash, or (ii) the Exchange Ratio, subject to certain proration and allocation provisions contained in the Merger Agreement.

	/s/ Kathleen R. Henry, by Power of Attorney	11/25/2025
	** 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 5 (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.