Exhibit 99.1

NB Bancorp, Inc. Announces Commencement of Additional Share Repurchase Plan

Investor Contact

JP Lapointe, EVP and CFO

IR@NeedhamBank.com

781-474-5408

Needham, MA, May 7, 2025 – NB Bancorp, Inc. (the “Company”) (Nasdaq Capital Market: NBBK), the holding company of Needham Bank (the “Bank”), today announced that it has adopted a stock repurchase plan for up to 2,028,522 shares of the Company’s common stock, which equals approximately 5.0% of the shares currently outstanding. This is the Company’s second stock repurchase plan since completing its mutual-to-stock conversion and related stock offering in December 2023.

“Given the strong earnings stream that the Company has been able to generate since we went public at the end of 2023, we are extremely happy to be able to provide returns to our shareholders in several ways, through continued earnings and through share repurchases. We look forward to continue sharing in the Company’s success with shareholders as we continue to grow market share,” commented Joseph Campanelli, Chairman, President and Chief Executive Officer.

SHARE REPURCHASE PLAN

The Company announced today that it has adopted a share repurchase plan for up to 2,028,522 shares of common stock, which equals approximately 5.0% of the shares currently issued and outstanding. 

● Shares may be repurchased in open market or private transactions, through block trades, or pursuant to any trading plan that may be adopted in accordance with Rule 10b5-1 of the Securities and Exchange Commission (the “SEC”).

● Repurchases will be made at management’s discretion at prices management considers to be attractive and in the best interests of both the Company and its shareholders, subject to the availability of shares, general market conditions, the trading price of the stock, alternative uses for capital, and the Company’s financial performance. Open market purchases may be subject to the limitations set forth in Rule 10b-18 of the SEC and other applicable legal requirements.

● The timing and amount of share repurchases under the share repurchase plan may be suspended, terminated or modified by the Company at any time for any reason, including market conditions, the cost of repurchasing shares, the availability of alternative investment opportunities, liquidity, and other factors deemed appropriate. These factors may also affect the timing and amount of share repurchases. The Company is not obligated to repurchase any particular number of shares or any shares in any specific time period.

ABOUT NB BANCORP, INC.

NB Bancorp, Inc. (Nasdaq Capital Market: NBBK) is the registered bank holding company of Needham Bank. Needham Bank is headquartered in Needham, Massachusetts, which is approximately 17 miles southwest of Boston’s financial district.

Known as the “Builder’s Bank,” Needham Bank has been helping individuals, businesses and non-profits build for their futures since 1892. Needham Bank offers an array of tech-forward products and services that businesses and consumers use to manage their financial needs.

We have the financial expertise typically found at much larger institutions and the local knowledge and commitment you can only find at a community bank. For more information, please visit https://NeedhamBank.com. Needham Bank is a member of FDIC.

Forward-Looking Statements

Statements in this press release that are not historical facts are forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, and are intended to be covered by the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. We may also make forward-looking statements in other documents we file with the Securities and Exchange Commission (the “SEC”), in our annual reports to our stockholders, in press releases and other written materials, and in oral statements made by our officers, directors or employees. You can identify forward-looking statements by the use of the words “believe,” “expect,” “anticipate,” “intend,” “estimate,” “assume,” “outlook,” “will,” “should,” and other expressions that predict or indicate future events and trends and which do not relate to historical matters. Although the Company believes that these forward-looking statements are based on reasonable estimates and assumptions, they are not guarantees of future performance and are subject to known and unknown risks, uncertainties, and other factors. You should not place undue reliance on our forward-looking statements. You should exercise caution in interpreting and relying on forward-looking statements because they are subject to significant risks, uncertainties and other factors which are, in some cases, beyond the Company’s control. The Company’s actual results could differ materially from those projected in the forward-looking statements as a result of, among other factors, changes in general business and economic conditions on a national basis and in the local markets in which the Company operates, including changes which adversely affect borrowers’ ability to service and repay loans; changes in customer behavior due to political, business and economic conditions, including inflation and concerns about liquidity; turbulence in the capital and debt markets; reductions in net interest income resulting from interest rate volatility as well as changes in the balances and mix of loans and deposits; changes in interest rates and real estate values; changes in loan collectability and increases in defaults and charge-off rates; decreases in the value of securities and other assets, adequacy of credit loss reserves, or deposit levels necessitating increased borrowing to fund loans and investments; changing government regulation; competitive pressures from other financial institutions; changes in legislation or regulation and accounting principles, policies and guidelines; cybersecurity incidents, fraud, natural disasters, and future pandemics; the risk that the Company may not be successful in the implementation of its business strategy; the risk that intangibles recorded in the Company’s financial statements will become impaired; changes in assumptions used in making such forward-looking statements; and the other risks and uncertainties detailed in the Company’s Form 10-K and updated by our Quarterly Report on Form 10-Q and other filings submitted to the SEC. These statements speak only as of the date of this release and the Company does not undertake any obligation to update or revise any of these forward-looking statements to reflect events or circumstances occurring after the date of this communication or to reflect the occurrence of unanticipated events.