The banking executive’s combined direct and indirect holdings now exceed 499,000 shares of the Needham-based institution.

March 20, 2026

Joseph P. Campanelli, who serves as President, CEO, and Chairman of the Board of NB Bancorp, Inc., purchased 2,500 shares of the company’s common stock on the open market on March 19, 2026. The shares were acquired at a price of $20.16 each, representing a total investment of approximately $50,400.

The transaction, disclosed in a regulatory statement of changes in beneficial ownership, signals continued confidence from the company’s top executive in the Needham, Massachusetts-based banking institution, which trades under the ticker symbol NBBK.

A Substantial Ownership Position

Following the purchase, Campanelli directly holds 396,661 shares of common stock. That figure includes restricted stock subject to two vesting schedules — one tranche vesting at a rate of 20 percent per year beginning April 24, 2026, and another vesting at roughly one-third per year starting February 25, 2027.

Beyond his direct holdings, Campanelli maintains additional indirect ownership through several vehicles:

• IRA: 47,000 shares
• 401(k) plan: 49,597 shares
• Employee Stock Ownership Plan: 3,677 shares
• Trust (as trustee): 3,000 shares

In total, his combined direct and indirect beneficial ownership now exceeds 499,000 shares.

Why Insider Purchases Matter

Insider purchases are closely watched by market participants as a potential indicator of management sentiment about a company’s prospects. Open-market buys are viewed as a particularly bullish signal because they involve executives spending personal funds to acquire shares at prevailing market prices rather than receiving them through compensation plans.

NB Bancorp completed its conversion from a mutual to a stock holding company structure in recent years, and Campanelli has remained a central figure in the organization throughout that transition. His continued accumulation of shares suggests a strong alignment between executive interests and those of public shareholders.

The filing was signed on March 19, 2026, by Steven T. Lanter under a power of attorney on behalf of Campanelli. No derivative securities transactions were reported.