NB Bancorp (NBBK) COO awarded 13,749 restricted stock shares

Rhea-AI Filing Summary

NB Bancorp, Inc. executive Christine Roberts, SEVP and COO, reported acquiring 13,749 shares of common stock through a restricted stock award at a price of $0 per share. These restricted shares vest at a rate of 33 1/3% per year starting on February 25, 2027.

Following this grant, Roberts directly holds a total of 74,670 common shares, which includes earlier restricted stock awards that vest at 20% per year commencing on April 24, 2026. These awards represent equity-based compensation rather than open-market purchases.

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

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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^*

Roberts Christine

(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)
	SEVP and COO

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	74,670(2)	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.

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

	/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).
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FAQ

What insider transaction did NB Bancorp (NBBK) report for Christine Roberts?

NB Bancorp reported that SEVP and COO Christine Roberts received a grant of 13,749 restricted common shares at $0 per share. The award is equity compensation, not an open-market trade, and increases her total direct holdings to 74,670 shares.

How do the newly granted NB Bancorp (NBBK) restricted shares vest?

The 13,749 newly granted restricted shares to Christine Roberts vest 33 1/3% per year beginning February 25, 2027. This means the award becomes fully vested in three years, aligning her long-term incentives with NB Bancorp’s performance over that period.

What is Christine Roberts’ total NB Bancorp (NBBK) share ownership after the grant?

After the restricted stock award, Christine Roberts directly owns 74,670 NB Bancorp common shares. This total includes both fully vested shares and prior restricted stock awards that vest 20% per year starting April 24, 2026, as disclosed in the filing.

Were Christine Roberts’ NB Bancorp (NBBK) shares bought in the open market?

No. The filing shows Christine Roberts acquired 13,749 NB Bancorp shares through a grant of restricted stock at $0 per share. This is stock-based compensation, not an open-market purchase or sale, and is classified as a grant or award acquisition.

What earlier NB Bancorp (NBBK) restricted stock awards are included in the total shares?

The 74,670 total shares held by Christine Roberts include restricted stock that vests 20% per year starting April 24, 2026. These earlier awards, plus the new grant vesting from 2027, represent her long-term incentive equity from NB Bancorp.