Form 4 Filing for NB Bancorp, Inc.

This filing reports a transaction by NOLAN JOSEPH R JR, a director at NB Bancorp, Inc. On April 24, 2026, Mr. Nolan disposed of 4,918 shares of Common Stock at a price of $19.82 per share. Following this transaction, he owns 82,821 shares. The filing includes footnotes indicating that the reported shares include restricted stock that vests over time, with 20% vesting annually starting April 24, 2026, and the remainder vesting fully on January 2, 2027.