NB Bancorp (NBBK) EVP granted 6,874 restricted stock units in Form 4

Rhea-AI Filing Summary

Maiona Stephanie reported acquisition or exercise transactions in this Form 4 filing.

NB Bancorp, Inc. executive Stephanie Maiona reported receiving a grant of 6,874 shares of restricted common stock. These shares vest in equal installments of 33 1/3% per year starting on February 25, 2027. Following this grant, she directly holds 6,874 shares, with additional indirect holdings through a 401(k) plan and an ESOP.

Insider Trade Summary

3 transactions reported

Mixed 3 txns

Insider Maiona Stephanie

Role EVP, Dir CRE Banking

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	6,874	$0.00	--
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 6,874 shares (Direct); Common Stock — 40,430 shares (Indirect, By 401(k))

Footnotes (1)

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

Maiona Stephanie

(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, Dir CRE Banking

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		6,874(1)	A	$0	6,874	D
Common Stock								40,430(2)	I	By 401(k)
Common Stock								3,422(2)	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. 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	02/27/2025
	** 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

What insider transaction did NB Bancorp (NBBK) report for Stephanie Maiona?

NB Bancorp reported that EVP Stephanie Maiona received a grant of 6,874 shares of restricted common stock. The award was recorded at a price of $0.00 per share and represents a non-cash equity compensation grant rather than an open-market purchase.

How do the restricted stock awards for NBBK executive Stephanie Maiona vest?

The 6,874 restricted shares granted to Stephanie Maiona vest at 33 1/3% per year starting February 25, 2027. This means the award vests in three equal annual installments, aligning long-term compensation with continued service at NB Bancorp, Inc.

What is Stephanie Maiona’s direct and indirect NB Bancorp (NBBK) share ownership after this filing?

After the grant, Stephanie Maiona directly holds 6,874 NB Bancorp common shares. She also has indirect ownership through a 401(k) plan holding 40,430 shares and an ESOP holding 3,422 shares, reflecting retirement and employee ownership plan balances reported in the filing.

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

The transaction was an equity award, not a market purchase. Stephanie Maiona received 6,874 restricted shares at a stated price of $0.00 per share, classified as a grant, award, or other acquisition under Form 4 transaction code A.

What role does Stephanie Maiona hold at NB Bancorp (NBBK) in this Form 4?

In this Form 4, Stephanie Maiona is identified as an officer of NB Bancorp, Inc. with the title "EVP, Dir CRE Banking." The reported restricted stock grant represents part of her executive compensation tied to the company’s common stock.