Material Event (Form 8-K)

Item 8.01 Other Events

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On May 13, 2026, NB Bancorp, Inc. (the "Company") announced the completion of its stock repurchase program. Under the plan, the Company repurchased 2,207,236 shares, or approximately 5% of its then outstanding common stock. The shares were repurchased by the Company at an average price of $20.96 per share, including commission and excise tax.

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Since announcing its first stock repurchase program on January 22, 2025, through the completion of the third stock repurchase program, the Company has repurchased 6,371,044 shares, or 16% of its common shares that were issued in its initial public offering at the end of 2023, at a weighted average price of $19.25. The Company's tangible book value per share was $18.00 as of March 31, 2026.

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