CAMPANELLI JOSEPH P 4

What Happened
Joseph P. Campanelli — President & CEO, director and Chairman of NB Bancorp (NBBK) — was granted 63,015 shares of restricted common stock on February 25, 2026. The shares were reported as acquired at $0.00 (award/grant), so there was no cash purchase or open-market trade reported.

Key Details

• Transaction date: 2026-02-25; Form 4 filed: 2026-02-27 (filed timely within the required two-business-day window).
• Transaction code: A (Award/Grant); Price per share reported: $0.00.
• Shares granted: 63,015 restricted shares.
• Shares owned after the transaction: not disclosed in this filing.
• Footnotes:
  • F1 — 33 1/3% of these restricted shares vest per year beginning Feb 25, 2027.
  • F2 — Includes restricted shares that vest at 20% per year beginning Apr 24, 2026.
  • F3 — Notes certain transactions not required to be reported under Section 16.

Context
This was a restricted stock award (not an open-market buy or sale). Restricted awards generally vest over time (see footnotes above) and are intended as compensation/retention rather than immediate market purchases or sales. The filing appears timely and does not by itself indicate a buying or selling preference by the insider.