NB Bancorp, Inc. — Director's Dealing 2025

Apr 28, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: NB Bancorp, Inc. (NBBK)
CIK: 0001979330
Period of Report: 2025-04-24

Reporting Person: CAMPANELLI JOSEPH P (Director, President & CEO, Chairman of the Board)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-04-24	Common Stock	A	274146	—	Acquired	329146	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	1877	Indirect
Common Stock	47388	Indirect
Common Stock	40000	Indirect

Footnotes

F1: Shares of restricted stock vest at a rate of 20% per year commencing on April 24, 2026.

F2: Reflects transactions not required to be reported pursuant to Section 16 of the Securities Act of 1934, as amended.