Jean-Pierre Lapointe - 09 Mar 2026 Form 4 Insider Report for NB Bancorp, Inc. (NBBK)

Role: SEVP and CFO
Signature: /s/ Steven Lanter, pursuant to power of attorney
Issuer symbol: NBBK
Transactions as of: 09 Mar 2026
Net transactions value: +$20,420
Form type: 4
Filing time: 09 Mar 2026, 13:42:56 UTC
Previous filing: 27 Feb 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Lapointe Jean-Pierre	SEVP and CFO	1063 GREAT PLAIN AVE, NEEDHAM	/s/ Steven Lanter, pursuant to power of attorney	09 Mar 2026	0001722126

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	NBBK	Common Stock	Purchase	$20,420	+1,000	+0.91%	$20.42	110,331	09 Mar 2026	Direct	F1, F2
holding	NBBK	Common Stock						4,018	09 Mar 2026	By 401(k)
holding	NBBK	Common Stock						1,779	09 Mar 2026	By ESOP

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Includes shares of restricted stock which vest at a rate of 20% per year commencing on April 24, 2026.
F2	Includes shares of restricted stock which vest at a rate of 33 1/3% per year commencing on February 25, 2027.