NBBK

EX-99.1

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EX-99.1

Exhibit 99.1

NB Bancorp, Inc. Reports Second Quarter 2026 Financial Results, Declares Quarterly Cash Dividend

Investor Contact

JP Lapointe, SEVP, CFO

IR@NeedhamBank.com

781-474-5408

Needham, MA, July 22, 2026 – NB Bancorp, Inc. (the “Company”) (Nasdaq Capital Market: NBBK), the holding company of Needham Bank (the “Bank”), today announced its second quarter 2026 financial results.

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●Net income for the second quarter of 2026 amounted to $21.1 million, or $0.53 per diluted common share, compared to net income of $15.0 million, or $0.36 per diluted common share, for the prior quarter. Return on average assets and return on average equity for the second quarter of 2026 were 1.17% and 10.03%, respectively, increases from 0.87% and 7.05%, respectively, for the prior quarter.

●Operating net income(1) for the second quarter of 2026 increased 38.5% and amounted to $21.9 million, or $0.55 per diluted common share, compared to operating net income(1) of $15.8 million, or $0.38 per diluted common share, for the prior quarter. Operating return on average assets(1) and operating return on average equity(1) for the second quarter of 2026 were 1.21% and 10.39%, respectively, increases from 0.92% and 7.43%, respectively, for the prior quarter.

●Net interest margin expanded by 7 basis points to 4.00% from 3.93% in the prior quarter as total loans increased 3.4% while total deposits increased 3.7% during the quarter. Net interest margin, excluding purchase accounting adjustments(1), expanded by 5 basis points to 3.87% during the current quarter from 3.82% in the prior quarter.

●Efficiency ratio improved to 58.92% from 61.55% in the prior quarter, while operating efficiency ratio(1) improved to 57.66% from 60.06% in the prior quarter.

●Net charge-offs (annualized) as a percent of average loans declined to 0.07% from 0.91% in the prior quarter. Non-performing loans as a percent of total loans decreased to 0.43% at the end of the second quarter from 0.73% at the end of the prior quarter.

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“The second quarter of 2026 displayed Needham Bank’s continued execution of our strategy for disciplined growth in market share as total loans increased 3.4% during the quarter, while total deposits increased 3.7% over the same period. Through the first half of 2026, total loans and total deposits have increased by 15.0% and 15.9% on an annualized basis, while operating EPS increased 24%, respectively. Our teams remained focused on executing our strategic priorities and investing in the infrastructure, technology, and operating capabilities needed to support continued profitable growth. This included targeted investments in artificial intelligence, improved internal systems and automation tools designed to enhance internal efficiency, scalability, and employee effectiveness. We are well positioned to continue to enhance the customer experience and grow market share, while improving long-term operating leverage. The dedication and collaboration of our employees continue to be defining strengths for Needham Bank. As we invest thoughtfully in technology, artificial intelligence, and operational capabilities, while maintaining strong credit performance and disciplined growth, we are building a more scalable and efficient organization that is well-positioned to deliver long-term value for our customers, communities, and shareholders,” Campanelli concluded.

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Declaration of Dividend

The Board of Directors declared a quarterly cash dividend of $0.07 per share, payable on August 19, 2026, to shareholders of record as of August 5, 2026.

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SELECTED FINANCIAL HIGHLIGHTS FOR THE SECOND QUARTER OF 2026

●Net income of $21.1 million, or $0.53 per diluted common share, compared to net income of $15.0 million, or $0.36 per diluted common share, for the prior quarter. Operating net income(1), excluding one-time charges, amounted to $21.9 million, or $0.55 per diluted common share, compared to operating net income(1) of $15.8 million, or $0.38 per diluted common share, for the prior quarter.

●Operating return on average assets increased to 1.21% from 0.92%, operating return on average equity increased to 10.39% from 7.43% and net interest margin expanded to 4.00% from 3.93%.

●Credit trends from the BankProv acquisition improved during the quarter, where net charge-offs to average loans decreased to 0.07% from 0.91% and non-performing assets to total assets decreased to 0.37% from 0.63%

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One-time pre-tax charges during the current quarter include:

oNon-recurring fees for business line expansion of $649 thousand ($499 thousand net of tax);

oFinal merger and acquisition costs of $296 thousand ($227 thousand net of tax) related to the Company’s acquisition of Provident; and

oTax expense and a modified endowment contract penalty of $27 thousand related to the surrender of Bank-owned life insurance (“BOLI”) policies acquired from BankProv.

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One-time pre-tax charges during the prior

EX-99.1

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EX-99.1

Exhibit 99.1

NB Bancorp, Inc. Reports First Quarter 2026 Financial Results, Declares Quarterly Cash Dividend

Investor Contact

JP Lapointe, SEVP, CFO

IR@NeedhamBank.com

781-474-5408

Needham, MA, April 22, 2026 – NB Bancorp, Inc. (the “Company”) (Nasdaq Capital Market: NBBK), the holding company of Needham Bank (the “Bank”), today announced its first quarter 2026 financial results. The Company reported net income of $15.0 million, or $0.36 per diluted common share, compared to net income of $7.7 million, or $0.19 per diluted common share, for the prior quarter. Operating net income(1), excluding one-time charges, amounted to $15.8 million, or $0.38 per diluted common share, compared to operating net income(1) of $21.2 million, or $0.51 per diluted common share for the prior quarter. The primary difference between net income and operating net income(1) for the first quarter of 2026 was a result of trailing merger and acquisition costs of $534 thousand (pre-tax) related to the Company’s completed acquisition of Provident Bancorp, Inc. (“Provident”) and its subsidiary, BankProv, on November 15, 2025 and non-recurring fees for business line expansion of $500 thousand (pre-tax).

“The first quarter of 2026 marked a pivotal transition for Needham Bank, following the seamless and successful integration of Provident. As a unified organization, we are advancing our technology infrastructure across a broad range of banking systems to position us for increased revenue growth, with a focus on expanding our cash management and payments capabilities and scalability. While expenses increased from front loading these strategic investment costs and the expenditure related to implementing and operating systems in parallel – necessary to preserve business and customer continuity – we anticipate these investments to drive substantial benefits for both customers and shareholders beginning in the second half of 2026, creating value as we pursue ongoing growth. We continued to execute our strategic plan with discipline, evidenced by strong core fundamentals, growing loans and core deposits on an annualized basis during the quarter by 15.0% and 15.7%, respectively, as we deepened and added more business and consumer relationships. Other key performance highlights include solid operating earnings per diluted share of $0.38, operating return on average equity of 7.43%, and consistently high credit quality. Net interest income increased 10.4% from the prior quarter, expanding net interest margin 2 basis points for the quarter and 33 basis points compared to the first quarter of 2025, showing our continued discipline on select assets and our related pricing,” commented Joseph Campanelli, Chairman, President and Chief Executive Officer. “We are proud of our seamless integration, now operating as one team, and remain committed to delivering exceptional service to our customers and community while driving sustained growth and long-term value for our shareholders,” Campanelli continued.

Declaration of Dividend

The Board of Directors declared a quarterly cash dividend of $0.07 per share, payable on May 20, 2026, to shareholders of record as of May 6, 2026.

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SELECTED FINANCIAL HIGHLIGHTS FOR THE FIRST QUARTER OF 2026

●Net income of $15.0 million, or $0.36 per diluted common share, compared to net income of $7.7 million, or $0.19 per diluted common share, for the prior quarter. Operating net income(1), excluding one-time charges, amounted to $15.8 million, or $0.38 per diluted common share, compared to operating net income(1) of $21.2 million, or $0.51 per diluted common share, for the prior quarter.

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One-time charges during the current quarter include:

oPre-tax trailing merger and acquisition costs of $534 thousand ($390 thousand net of tax) related to the Company’s completed acquisition of Provident;

oNon-recurring fees for business line expansion of $500 thousand ($366 thousand net of tax); and

oTax expense and a modified endowment contract penalty of $50 thousand related to the surrender of Bank-owned life insurance (“BOLI”) policies from policies acquired from BankProv.

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One-time pre-tax charges during the prior quarter include:

oPre-tax merger and acquisition costs of $15.7 million ($11.4 million, net of tax) related to the Company’s completed acquisition of Provident; and

oTax expense and a modified endowment contract penalty of $2.1 million related to the surrender of BOLI policies from policies acquired from BankProv.

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●Net interest margin expanded by 2 basis points to 3.94% during the current quarter from 3.92% in the prior quarter.

●Gross loans increased $223.8 million, or 3.7%, to $6.21 billion, from $5.99 billion the prior quarter.

●Total deposits increased $243.5 million, or 4.2%, to $6.10 billion, from $5.85 billion in the prior quarter.

oCore deposits, which the Company considers to be all non-brokered deposits, increased $209.1 million, or 3.9%, to

NB BANCORP, INC._January 22, 2026 0001979330false00019793302026-01-222026-01-22

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(D) OF

THE SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): January 22, 2026

NB BANCORP, INC.

(Exact Name of Registrant as Specified in Charter) ​ ​ ​ ​ ​

Maryland ​ 001-41899 ​ ​ ​ 93-2560883

(State or Other Jurisdiction) ​ (Commission File No.) ​ (I.R.S. Employer

of Incorporation) ​ ​ ​ Identification No.)

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​ 1063 Great Plain Avenue, Needham, Massachusetts 02492

​ (Address of Principal Executive Offices) (Zip Code)

​ Registrant’s telephone number, including area code: (781) 444-2100 Not Applicable (Former name or former address, if changed since last report) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below): ☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

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Title of each class ​ ​ ​ Trading Symbol(s) ​ ​ ​ Name of each exchange on which registered

Common Stock, Par Value $0.01 Per Share ​

NBBK

​ The Nasdaq Stock Market, LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging growth company ☒ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐ ​ ​ ​

Item 2.02 Results of Operation and Financial Condition.

On January 22, 2026, NB Bancorp, Inc., the holding company for Needham Bank, issued a press release in which it announced its earnings for the quarter ended December 31, 2025. A copy of the press release announcing the results is included as Exhibit 99.1 to this Current Report on Form 8-K and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933. Item 8.01 Other Events.

On January 22, 2026, the Board of Directors of NB Bancorp, Inc. declared a dividend of $0.07 per share. The dividend will be paid February 19, 2026 to stockholders of record as of February 5, 2026. ​ On January 22, 2025, the Board of Directors of NB Bancorp, Inc. also authorized the Company to purchase up to 2,288,509 shares, or 5%, of the Company’s outstanding shares of common stock. ​ A copy of the press release announcing the declaration of the dividend and the adoption of the stock repurchase program is attached to this Current Report on Form 8-K as Exhibit 99.1 and is hereby incorporated by reference. Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

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Exhibit No. ​ ​ ​ Description

99.1 ​ Press Release dated January 22, 2026

104.1 ​ Cover Page Interactive Data File (Embedded within Inline XBRL document)

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, hereunto duly authorized. ​

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NB BANCORP, INC.

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DATE: January 22, 2026 By: /s/Jean-Pierre Lapointe

​ ​ Executive Vice President and Chief Financial Officer

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