Restricted stock award boosts NB Bancorp (NBBK) CEO share holdings

Rhea-AI Filing Summary

CAMPANELLI JOSEPH P reported acquisition or exercise transactions in this Form 4 filing.

NB Bancorp, Inc. President and CEO Joseph P. Campanelli received a grant of 63,015 shares of common stock as a restricted stock award on February 25, 2026 at a stated price of $0.0000 per share. These restricted shares vest at a rate of 33 1/3% per year starting on February 25, 2027.

After this grant, his directly held common stock totals 394,161 shares. He also has indirect ownership through retirement and employee plans, including 45,000 shares held by an IRA, 49,597 shares held by a 401(k), and 3,677 shares held by an ESOP. Some of the reported totals include earlier restricted stock that vests 20% per year beginning April 24, 2026.

Insider Trade Summary

4 transactions reported

Mixed 4 txns

Insider CAMPANELLI JOSEPH P

Role President & CEO

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	63,015	$0.00	--
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 394,161 shares (Direct); Common Stock — 45,000 shares (Indirect, By IRA)

Footnotes (1)

1. Shares of restricted stock vest at a rate of 33 1/3% per year commencing on February 25, 2027. Includes shares of restricted stock which vest at a rate of 20% per year commencing on April 24, 2026. Reflects transactions not required to be reported pursuant to Section 16 of the Securities Act of 1934, as amended.

Form 4 Insider Transactions: What Each Field Means →

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
Estimated average burden
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^*

CAMPANELLI JOSEPH P

(Last) (First) (Middle)

1063 GREAT PLAIN AVE

(Street)

NEEDHAM MA 02492

(City) (State) (Zip)

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

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

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

3. Date of Earliest Transaction (Month/Day/Year)
02/25/2026

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 Stock	02/25/2026		A		63,015(1)	A	$0	394,161(2)	D
Common Stock								45,000	I	By IRA
Common Stock								49,597(3)	I	By 401(k)
Common Stock								3,677(3)	I	By ESOP

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. Shares of restricted stock vest at a rate of 33 1/3% per year commencing on February 25, 2027.

2. Includes shares of restricted stock which vest at a rate of 20% per year commencing on April 24, 2026.

3. Reflects transactions not required to be reported pursuant to Section 16 of the Securities Act of 1934, as amended.

	/s/ Steven Lanter, pursuant to power of attorney	02/27/2026
	** 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

What insider transaction did NB Bancorp (NBBK) report for its CEO?

NB Bancorp reported a grant of 63,015 shares of common stock to President and CEO Joseph P. Campanelli. The shares are a restricted stock award, issued at a stated price of $0.0000 per share, increasing his directly held common stock to 394,161 shares.

How do the 63,015 restricted NB Bancorp (NBBK) shares vest for the CEO?

The 63,015 restricted shares granted to NB Bancorp’s CEO vest in three equal annual installments. They vest at 33 1/3% per year, beginning on February 25, 2027, meaning full vesting occurs over three years if applicable service or conditions are satisfied.

What is Joseph P. Campanelli’s total direct NB Bancorp (NBBK) shareholding after the grant?

Following the restricted stock grant, Joseph P. Campanelli directly holds 394,161 shares of NB Bancorp common stock. This figure includes previously held shares and the new restricted award, reflecting his direct ownership position as President, CEO, and Chairman of the Board.

What indirect NB Bancorp (NBBK) holdings does the CEO report?

The CEO reports several indirect holdings: 45,000 shares held by an IRA, 49,597 shares held by a 401(k), and 3,677 shares held by an ESOP. These are beneficially owned through retirement and employee stock ownership arrangements rather than directly in his own name.

Are there other NB Bancorp (NBBK) restricted shares previously granted to the CEO?

Yes. Some of the CEO’s holdings include earlier restricted stock that vests 20% per year starting April 24, 2026. This separate vesting schedule applies to prior awards and is distinct from the new grant vesting 33 1/3% annually from February 25, 2027.

Were all NB Bancorp (NBBK) CEO transactions on this date Section 16 reportable?

No. A footnote states that certain reflected transactions are not required to be reported under Section 16 of the Securities Exchange Act of 1934. The Form 4 focuses on the material grant and updated holdings, with some internal plan movements excluded from mandatory reporting.