NB Bancorp, Inc. — Director's Dealing 2025

Jun 10, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: NB Bancorp, Inc. (NBBK)
CIK: 0001979330
Period of Report: 2025-06-09

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
2025-06-09	Common Stock	P	1000	$16.03	Acquired	330146	Direct
2025-06-09	Common Stock	P	100	$16.33	Acquired	330246	Direct
2025-06-09	Common Stock	P	900	$16.35	Acquired	331146	Direct
2025-06-09	Common Stock	P	5000	$16.29	Acquired	45000	Indirect

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	1877	Indirect
Common Stock	47788	Indirect

Footnotes

F1: Includes shares of restricted stock which 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.