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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): April 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.)

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:

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 April 22, 2026, NB Bancorp, Inc. (the “Company”), the holding company for Needham Bank, issued a press release in which it announced its earnings for the quarter ended March 31, 2026.

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 5.02

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

On April 22, 2026, the Company’s Board of Directors (the “Board”) approved and adopted the NB Bancorp, Inc. and Needham Bank Executive Annual Incentive Plan (the “EAIP”), effective as of January 1, 2026.

The EAIP provides senior management executives of the Company and its affiliates with the opportunity to earn annual cash incentive awards, as determined by the Compensation Committee of the Board (the “Committee”). Under the EAIP, the Committee will establish target award opportunities (expressed as a percentage of base salary), performance goals, and a performance formula for each performance period (generally, the Company’s fiscal year). Awards are contingent upon the achievement of performance goals established by the Committee and may be adjusted, reduced or increased in the Committee’s discretion, subject to the terms of the EAIP. The EAIP also includes a maximum award opportunity of 125% of target and contains customary provisions regarding termination of employment, clawback and compliance with Section 409A of the Internal Revenue Code of 1986, as amended.

The foregoing description of the EAIP does not purport to be complete and is qualified in its entirety by reference to the full text of the EAIP, which is filed as Exhibit 10.1 to this Current Report on Form 8-K and is incorporated herein by reference.

Item 8.01

Other Events.

On April 22, 2026, the Board declared a dividend of $0.07 per share. The dividend will be paid May 20, 2026 to stockholders of record as of May 6, 2026.

The Company’s announcement of the Board’s dividend declaration is included in Exhibit 99 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

Exhibit No.

  ​ ​ ​

Description

10.1

NB Bancorp, Inc. and Needham Bank Executive Annual Incentive Plan

99.1

Press Release dated April 22, 2026

104.1

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

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.

NB BANCORP, INC.

DATE: April 22, 2026

By: 

/s/Jean-Pierre Lapointe

Senior Executive Vice President and Chief Financial Officer