Executive Matthew Richardson awarded 13,749 NB Bancorp (NBBK) shares

Rhea-AI Filing Summary

Richardson Matthew reported acquisition or exercise transactions in this Form 4 filing.

NB Bancorp, Inc. executive Matthew Richardson reported an award of common stock under the company’s equity compensation program. He received 13,749 shares of restricted common stock at a price of $0.00 per share, increasing his directly held common stock to 13,749 shares.

The restricted shares vest in stages, with 33 1/3% of the award vesting each year starting on February 25, 2027. This means the grant is intended as long‑term incentive compensation that fully vests over three years if service-based conditions are met.

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^*

Richardson Matthew

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP, Treasury & Cash Mgmt Svcs

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		13,749(1)	A	$0	13,749	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. Shares of restricted stock vest at a rate of 33 1/3% per year commencing on February 25, 2027.

	/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 Matthew Richardson?

NB Bancorp reported that executive Matthew Richardson received a grant of 13,749 shares of restricted common stock at $0.00 per share. This equity award increased his directly held common stock position to 13,749 shares, reflecting stock-based compensation rather than an open-market purchase.

Was the NB Bancorp (NBBK) insider transaction a stock purchase or an award?

The NB Bancorp transaction for Matthew Richardson was a stock award, not a purchase. He acquired 13,749 shares of restricted common stock at $0.00 per share as compensation, classified as a grant or award acquisition rather than an open-market buy.

How many NB Bancorp (NBBK) shares does Matthew Richardson hold after this Form 4?

After the reported transaction, Matthew Richardson directly holds 13,749 shares of NB Bancorp common stock. All these shares come from the new restricted stock grant disclosed, with the Form 4 showing total shares following the transaction equal to 13,749.

What is the vesting schedule for Matthew Richardson’s NB Bancorp (NBBK) restricted stock?

Richardson’s restricted NB Bancorp shares vest at 33 1/3% per year beginning February 25, 2027. This three-year graded vesting structure means one-third of the 13,749-share award vests annually, subject to the service-based conditions described in the footnote.

What does the $0.00 price mean in the NB Bancorp (NBBK) Form 4 transaction?

The $0.00 price indicates this was a compensatory grant, not a cash purchase. Matthew Richardson received 13,749 restricted shares of NB Bancorp common stock as an equity award, so no cash changed hands in the reported transaction.