# EDGAR Filing Document

**Accession Number:** 0001979330
**File Stem:** 0001104659-26-046868
**Filing Date:** 2026-4
**Character Count:** 89935
**Document Hash:** e34d74f5303c5107cd9161201cbe439a
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-26-046868.hdr.sgml**: 20260422

**ACCESSION NUMBER**: 0001104659-26-046868

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 16

**CONFORMED PERIOD OF REPORT**: 20260422

**ITEM INFORMATION**: Results of Operations and Financial Condition

**ITEM INFORMATION**: Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

**ITEM INFORMATION**: Other Events

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20260422

**DATE AS OF CHANGE**: 20260422

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** NB Bancorp, Inc.
- **CENTRAL INDEX KEY:** 0001979330
- **STANDARD INDUSTRIAL CLASSIFICATION:** SAVINGS INSTITUTIONS, NOT FEDERALLY CHARTERED [6036]
- **ORGANIZATION NAME:** 02 Finance
- **EIN:** 932560883
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-41899
- **FILM NUMBER:** 26884277

**BUSINESS ADDRESS:**
- **STREET 1:** 1063 GREAT PLAIN AVENUE
- **CITY:** NEEDHAM
- **STATE:** MA
- **ZIP:** 02492
- **BUSINESS PHONE:** 781-444-2100

**MAIL ADDRESS:**
- **STREET 1:** 1063 GREAT PLAIN AVENUE
- **CITY:** NEEDHAM
- **STATE:** MA
- **ZIP:** 02492

?xml version='1.0' encoding='ASCII'? NB BANCORP, INC._April 22, 2026

**UNITED STATESSECURITIES AND EXCHANGE COMMISSIONWASHINGTON, D.C. 20549**

**FORM 8-KCURRENT 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 <br> (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** | **Name of each exchange on which registered** |
| Common Stock, Par Value $0.01 Per Share<br> 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.** |

---

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(d) Exhibits

---

| | |
|:---|:---|
| Exhibit No. | Description |
| 10.1 | [NB Bancorp, Inc. and Needham Bank Executive Annual Incentive Plan](nbbk-20260422xex10d1.htm) |
| 99.1 | [Press Release dated April 22, 2026](nbbk-20260422xex99d1.htm) |
| 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 |

---

## Exhibit 10.1

![Graphic](nbbk-20260422xex10d1001.jpg)

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

&nbsp;&nbsp;&nbsp;&nbsp;1.**Background and Purpose**.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.1<u>Purpose</u>. The purpose of the NB Bancorp, Inc. and Needham Bank Executive Annual Incentive Plan (the "**Plan**") is to align the interests of its senior executives with the interests of the Company and shareholders in obtaining superior financial results.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.2<u>Effective Date</u>. The Plan is effective as of January 1, 2026 (the "**Effective Date**"), and shall remain in effect until it has been terminated pursuant to Section 8.6.

&nbsp;&nbsp;&nbsp;&nbsp;2.**Definitions**. The following terms shall have the following meanings:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.1"**Affiliate**" means any corporation or other entity controlled by the Company.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.2 "**Award**" means an award granted pursuant to the Plan, the payment of which shall be contingent on the attainment of Performance Goals with respect to a Performance Period, as determined by the Committee pursuant to Section 6.1.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.3"**Bank**" means Needham Bank, and any successor thereto.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.4 "**Base Salary**" means the Participant's annualized rate of base salary on the last day of the Performance Period before (a) deductions for taxes or benefits and (b) deferrals of compensation pursuant to any Company or Affiliate-sponsored plans.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.5 "**Board**" means the Board of Directors of the Holding Company and the Bank, as constituted from time to time.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.6 "**Cause**" means:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a)If the Participant is a party to an employment agreement with the Company or an Affiliate and such agreement provides for a definition of Cause, the definition contained therein; or

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b)If no such agreement exists, or if such agreement does not define Cause:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i)the Participant's failure to perform the Participant's duties (other than any such failure resulting from incapacity due to physical or mental illness);

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii)the Participant's engagement in dishonesty, illegal conduct or misconduct, which is, in each case, materially injurious to the Company or its Affiliates;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iii)the Participant's embezzlement, misappropriation or fraud, whether or not related to the Participant's employment with the Company;

------

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iv)the Participant's conviction of or plea of guilty or nolo contendere to a crime that constitutes a felony (or state law equivalent) or a crime that constitutes a misdemeanor involving moral turpitude, if such felony or other crime is work-related, materially impairs the Participant's ability to perform services for the Company or results in material harm to the Company or its Affiliates;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(v)the Participant's violation of the Company's written policies or codes of conduct, including written policies related to discrimination, harassment, performance of illegal or unethical activities, and ethical misconduct; or

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(vi)the Participant's violation of any restrictive covenants entered into between the Participant and the Company or the Company's Code of Conduct.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.7"**Code**" means the U.S. Internal Revenue Code of 1986, as amended from time to time, including any regulations or authoritative guidance promulgated thereunder and successor provisions thereto.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.8"**Committee**" means the Compensation Committee appointed by the Board to administer the Plan pursuant to Section 3.1.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.9"**Company**" means NB Bancorp, Inc. and its wholly-owned subsidiary Needham Bank collectively, and any successors thereto.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.10"**Disability**" means, unless otherwise defined in an employment agreement between the Participant and the Company, total and permanent disability in accordance with the Company's long-term disability plan.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.11"**Holding Company**" means NB Bancorp, Inc., and any successor thereto.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.12"**Maximum Award**" means as to any Participant for any Plan Year, 125% of the Performance Goals.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.13"**Participant**" means as to any Performance Period, the senior management executive of the Bank or an Affiliate who is designated by the Committee to participate in the Plan for that Performance Period.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.14"**Performance Criteria**" means the performance criteria upon which the Performance Goals for a particular Performance Period are based, or such other criteria as determined by the Committee in accordance with Section 5.2.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.15"**Performance Goals**" means the goals selected by the Committee, in its discretion, to be applicable to a Participant for any Performance Period. Performance Goals shall be based upon one or more Performance Criteria. Performance Goals may include a threshold level of performance below which no Award will be paid and levels of performance at which specified percentages of the Target Award will be paid and may also include a maximum level of performance above which no additional Award amount will be paid.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.16"**Performance Period**" means the period for which performance is calculated, which unless otherwise indicated by the Committee, shall be the Plan Year.

------

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.17"**Plan**" means the NB Bancorp, Inc. and Needham Bank Executive Annual Incentive Plan, as hereafter amended from time to time.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.18"**Plan Year**" means the Company's fiscal year, which commences on January 1st and ends on December 31st.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.19"**Pro-Rated Award**" means an amount equal to the Award otherwise payable to the Participant for a Performance Period in which the Participant was actively employed by the Company or an Affiliate for only a portion thereof/the Target Award, multiplied by a fraction, the numerator of which is the number of days the Participant was actively employed by the Company or an Affiliate during the Performance Period and the denominator of which is the number of days in the Performance Period.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.20"**Target Award**" means the target award payable under the Plan to a Participant for a particular Performance Period, expressed as a percentage of the Participant's Base Salary.

&nbsp;&nbsp;&nbsp;&nbsp;3.**Administration**.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.1<u>Administration by the Committee</u>. The Plan shall be administered by the Committee.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.2<u>Authority of the Committee</u>. Subject to the provisions of the Plan and applicable law, the Committee shall have the power, in addition to other express powers and authorizations conferred on the Committee by the Plan, to: (a) designate Participants; (b) determine the terms and conditions of any Award; (c) determine whether, to what extent, and under what circumstances Awards may be forfeited or suspended; (d) interpret, administer, reconcile any inconsistency, correct any defect and/or supply any omission in the Plan or any instrument or agreement relating to, or Award granted under, the Plan; (e) establish, amend, suspend, or waive any rules for the administration, interpretation and application of the Plan; and (f) make any other determination and take any other action that the Committee deems necessary or desirable for the administration of the Plan.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.3<u>Decisions Binding</u>. All determinations and decisions made by the Committee, the Board, and any delegate of the Committee pursuant to the provisions of the Plan shall be final, conclusive and binding on all persons, and shall be given the maximum deference permitted by law.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.4<u>Delegation by the Committee</u>. The Committee, in its sole discretion, may delegate all or part of its authority and powers under the Plan to one or more directors and/or officers of the Company; provided, however, that the Committee may not delegate its responsibility to make Awards to executive officers.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.5<u>Agents; Limitation of Liability</u>. The Committee may appoint agents to assist in administering the Plan. The Committee and each member thereof shall be entitled to, in good faith, rely or act upon any report or other information furnished to it or him by any officer or employee of the Company, the Company's certified public accountants, consultants or any other agent assisting in the administration of the Plan. Members of the Committee and any officer or employee of the Company acting at the direction or on behalf of the Committee shall not be personally liable for any action or determination taken or made in good faith with respect to the Plan, and shall, to the extent permitted by law, be fully indemnified and protected by the Company with respect to any such action or determination.

------

&nbsp;&nbsp;&nbsp;&nbsp;4.**Eligibility and Participation**.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4.1<u>Eligibility</u>. Only senior management executive level employees of the Company and its participating Affiliates are eligible to participate in the Plan.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4.2<u>Participation</u>. The Committee, in its discretion, shall select the persons who shall be Participants for each Performance Period. Only eligible individuals who are designated by the Committee to participate in the Plan with respect to a particular Performance Period may participate in the Plan for that Performance Period. An individual who is designated as a Participant for a given Performance Period is not guaranteed or assured of being selected for participation in any subsequent Performance Period.

&nbsp;&nbsp;&nbsp;&nbsp;5.**Terms of Awards**.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5.1<u>Determination of Target Awards</u>. Prior to, or reasonably promptly following the commencement of each Performance Period, the Committee, in its sole discretion, shall establish the Target Award, the payment of which shall be conditioned on the achievement of the Performance Goals for the Performance Period.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5.2<u>Determination of Performance Goals and Performance Formula</u>. Prior to, or reasonably promptly following the commencement of, each Performance Period, the Committee, in its sole discretion, shall establish in writing the Performance Goals for the Performance Period and shall prescribe a formula for determining the percentage of the Target Award which may be payable based upon the level of attainment of the Performance Goals for the Performance Period. The Performance Goals shall be based on one or more Performance Criteria, each of which may carry a different weight.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5.3<u>Adjustments</u>. The Committee is authorized to adjust or modify the calculation of a Performance Goal for a Performance Period in its sole discretion.

&nbsp;&nbsp;&nbsp;&nbsp;6.**Payment of Awards**.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6.1<u>Determination of Awards</u>.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a)Following the completion of each Performance Period, the Committee shall determine the extent to which the Performance Goals have been achieved or exceeded. Subject to Section 6.1(c), if the minimum Performance Goals established by the Committee are not achieved, then no payment will be made.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b)To the extent that the Performance Goals are achieved, the Committee shall then determine the amount of each Participant's Award.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c)In determining the amount of each Award, the Committee may reduce, eliminate, or increase the amount of an Award if, in its sole discretion, such reduction, elimination, or increase is appropriate.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(d)In no event shall the amount of an Award for any Plan Year exceed the Maximum Award.

------

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6.2<u>Form and Timing of Payment</u>. Except as otherwise provided herein, as soon as practicable following the Committee's determination pursuant to Section 6.1 for the applicable Performance Period, each Participant shall receive a cash lump sum payment of their Award, less required withholding. In no event shall such payment be made later than ninety (90) days following the end of the Performance Period.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6.3<u>Employment Requirement</u>. No Award shall be paid to any Participant who is not actively employed by the Company or an Affiliate on the date that Awards are paid.

&nbsp;&nbsp;&nbsp;&nbsp;7.**Termination of Employment**.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7.1<u>Employment Requirement</u>. Except as otherwise provided in Section 7.2, if a Participant's employment terminates for any reason prior to the date that Awards are paid, all of the Participant's rights to an Award for the Performance Period shall be forfeited. However, the Committee, in its sole discretion, may pay a Pro-Rated Award, subject to the Committee's determination that the Performance Goals for the Performance Period have been met. Such Pro-Rated Award will be paid at the same time and in the same manner as Awards are paid to other Participants. Notwithstanding the foregoing, if a Participant's employment is terminated for Cause, the Participant shall in all cases forfeit any Award not already paid.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7.2<u>Termination of Employment Due to Death or Disability</u>. If a Participant's employment is terminated by reason of the Participant's death or Disability during a Performance Period or following a Performance Period but before the date that the Award is paid, the Participant or their beneficiary will be paid a Pro-Rated Award or the Award that would otherwise be payable if the Participant remained employed through the date that the Award is paid. In the case of a Participant's Disability, the employment termination shall be deemed to have occurred on the date that the Committee determines that the Participant is Disabled. Payment of such Award or Pro-Rated Award, as applicable, will be made at the same time and in the same manner as Awards are paid to other Participants.

&nbsp;&nbsp;&nbsp;&nbsp;8.**General Provisions**.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8.1<u>Compliance with Legal Requirements</u>. The Plan and the granting of Awards shall be subject to all applicable federal and state laws, rules and regulations, and to such approvals by any regulatory or governmental agency as may be required.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8.2<u>Non-transferability</u>. A person's rights and interests under the Plan, including any Award previously made to such person or any amounts payable under the Plan may not be assigned, pledged, or transferred, except in the event of the Participant's death, to a designated beneficiary in accordance with the Plan, or in the absence of such designation, by will or the laws of descent or distribution.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8.3<u>No Right to Employment</u>. Nothing in the Plan or in any notice of Award shall confer upon any person the right to continue in the employment of the Company or any Affiliate or affect the right of the Company or any Affiliate to terminate the employment of any Participant.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8.4<u>No Right to Award</u>. Unless otherwise expressly set forth in an employment agreement signed by the Company and a Participant, a Participant shall not have any right to any Award under the Plan until such Award has been paid to such Participant and participation in the

------

Plan in one Performance Period does not connote any right to become a Participant in the Plan in any future Performance Period.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8.5<u>Withholding</u>. The Company shall have the right to withhold from any Award, any federal, state or local income and/or payroll taxes required by law to be withheld and to take such other action as the Committee may deem advisable to enable the Company and Participants to satisfy obligations for the payment of withholding taxes and other tax obligations relating to an Award.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8.6<u>Amendment or Termination of the Plan</u>. The Committee may, at any time, amend, suspend or terminate the Plan in whole or in part. Notwithstanding the foregoing, no amendment shall adversely affect the rights of any Participant to Awards allocated prior to such amendment, suspension or termination.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8.7<u>Unfunded Status</u>. Nothing contained in the Plan, and no action taken pursuant to its provisions, shall create or be construed to create a trust of any kind or a fiduciary relationship between the Company and any Participant, beneficiary or legal representative or any other person. To the extent that a person acquires a right to receive payments under the Plan, such right shall be no greater than the right of an unsecured general creditor of the Company. All payments to be made hereunder shall be paid from the general funds of the Company and no special or separate fund shall be established and no segregation of assets shall be made to assure payment of such amounts except as expressly set forth in the Plan. The Plan is not intended to be subject to the Employee Retirement Income Security Act of 1974, as amended (ERISA).

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8.8<u>Governing Law</u>. The Plan shall be construed, administered and enforced in accordance with the laws of Massachusetts without regard to conflicts of law.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8.9<u>Beneficiaries</u>. To the extent that the Committee permits beneficiary designations, any payment of Awards due under the Plan to a deceased Participant shall be paid to the beneficiary duly designated by the Participant in accordance with the Company's practices. If no such beneficiary has been designated or survives the Participant, payment shall be made by will or the laws of descent or distribution.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8.10<u>Section 409A of the Code</u>. It is intended that payments under the Plan shall be exempt from the requirements of Section 409A of the Code. In the event that any Award does not qualify for exempt treatment, it is intended that such amount will be paid in a manner that satisfies the requirements of Section 409A of the Code. The Plan shall be interpreted and construed accordingly. Notwithstanding the foregoing, the Company makes no representations that the payments and benefits provided under this Plan are either exempt from or comply with Section 409A, and in no event shall the Company be liable for all or any portion of any taxes, penalties, interest, or other expenses that may be incurred by the Participant on account of non-compliance with Section 409A.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8.11<u>Expenses</u>. All costs and expenses in connection with the administration of the Plan shall be paid by the Company.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8.12<u>Section Headings</u>. The headings of the Plan have been inserted for convenience of reference only and in the event of any conflict, the text of the Plan, rather than such headings, shall control.

------

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8.13<u>Severability</u>. In the event that any provision of the Plan shall be considered illegal or invalid for any reason, such illegality or invalidity shall not affect the remaining provisions of the Plan, but shall be fully severable, and the Plan shall be construed and enforced as if such illegal or invalid provision had never been contained therein.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8.14<u>Gender and Number</u>. Except where otherwise indicated by the context, wherever used, the masculine pronoun includes the feminine pronoun; the plural shall include the singular, and the singular shall include the plural.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8.15<u>Non-exclusive</u>. Nothing in the Plan shall limit the authority of the Company, the Board or the Committee to adopt such other compensation arrangements, as it may deem desirable for any Participant.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8.16<u>Notice</u>. Any notice to be given to the Company or the Committee pursuant to the provisions of the Plan shall be in writing and directed to the Compensation Committee of the Company at 1063 Great Plain Ave, Needham, MA 02492.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8.17<u>Successors</u>. All obligations of the Company under the Plan with respect to Awards granted hereunder shall be binding upon any successor to the Company, whether the existence of such successor is the result of a direct or indirect purchase, merger, consolidation or otherwise, of all or substantially all of the assets of the Company.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8.18<u>Clawback</u>. Notwithstanding any other provision of the Plan, the Company may cancel any Award, require reimbursement of any Award by a Participant, and effect any other right of recoupment of compensation provided under the Plan in accordance with any Company policies that may be adopted and/or modified from time to time ("Clawback Policy"). In addition, a Participant may be required to repay to the Company previously paid compensation, in accordance with the Clawback Policy. By accepting an Award, the Participant is agreeing to be bound by the Clawback Policy, as in effect or as may be adopted and/or modified from time to time by the Company in its discretion (including, without limitation, to comply with applicable law or stock exchange listing requirements).

The action permitted to be taken by the Board under this Section 8.18 is in addition to, and not in lieu of, any and all other rights of the Board and/or the Company under applicable law and shall apply notwithstanding anything to the contrary in the Plan.

------

## Exhibit 99.1

**Exhibit 99.1**

![Graphic](nbbk-20260422xex99d1001.jpg)

**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<sup>(1)</sup>, excluding one-time charges, amounted to $15.8 million, or $0.38 per diluted common share, compared to operating net income<sup>(1)</sup> 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<sup>(1)</sup> 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.

------

**SELECTED FINANCIAL HIGHLIGHTS FOR THE FIRST QUARTER OF 2026**

&nbsp;&nbsp;&nbsp;&nbsp;● 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 <sup>(1)</sup> , excluding one-time charges, amounted to $15.8 million, or $0.38 per diluted common share, compared to operating net income <sup>(1)</sup> of $21.2 million, or $0.51 per diluted common share, for the prior quarter.

One-time charges during the current quarter include:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o Pre-tax trailing merger and acquisition costs of $534 thousand ($390 thousand net of tax) related to the Company's completed acquisition of Provident;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o Non-recurring fees for business line expansion of $500 thousand ($366 thousand net of tax); and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o Tax 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.

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

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o Pre-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

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o Tax expense and a modified endowment contract penalty of $2.1 million related to the surrender of BOLI policies from policies acquired from BankProv.

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

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

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

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o Core deposits, which the Company considers to be all non-brokered deposits, increased $209.1 million, or 3.9%, to $5.53 billion, from $5.32 billion in the prior quarter.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o Brokered deposits increased $34.4 million, or 6.4%, to $570.1 million, from $535.7 million in the prior quarter.

&nbsp;&nbsp;&nbsp;&nbsp;● Book value per share and tangible book value per share <sup>(1)</sup> were $18.83 and $18.00, respectively, compared to $18.77 and $17.94, respectively, in the prior quarter. The increase in tangible book value per share <sup>(1)</sup> was a result of $15.0 million in net income for the quarter, partially offset by the repurchase of 1,288,509 shares during the current quarter at an all-in weighted average cost of $21.55 per share and $3.2 million in dividends paid during the quarter.

**BALANCE SHEET**

Total assets amounted to $7.23 billion as of March 31, 2026, representing an increase of $220.3 million, or 3.1%, from $7.01 billion as of December 31, 2025.

&nbsp;&nbsp;&nbsp;&nbsp;● Cash and cash equivalents decreased $32.2 million, or 7.9%, to $375.4 million from $407.6 million in the prior quarter, as a result of the increase in loans of $223.8 million and the repurchase of 1,288,509 shares totaling $27.8 million during the current quarter, partially offset by the increase in deposits of $243.5 million during the current quarter.

&nbsp;&nbsp;&nbsp;&nbsp;● Net loans increased $231.0 million, or 3.9%, to $6.13 billion, from $5.90 billion in the prior quarter as demand for new loan originations and advances continued. The current quarter increase was primarily seen in commercial and industrial loans, which increased $135.4 million, or 13.4%, construction and land development loans, which increased $52.1 million, or 7.1%, multi-family residential loans, which increased $20.6 million, or 4.0% and residential real estate loans, which increased $11.6 million, or 0.9%.

&nbsp;&nbsp;&nbsp;&nbsp;● Deposits increased $243.5 million, or 4.2%, to $6.10 billion from $5.85 billion in the prior quarter. The increase in deposits was the result of increases in money market accounts of $92.3 million, or 5.6%, noninterest bearing demand deposits of $44.6 million, or 5.4%, certificates of deposit of $39.1 million, or 2.0%, brokered deposits of $34.4 million, or 6.4% and NOW accounts of $30.4 million, or 4.6%.

------

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

&nbsp;&nbsp;&nbsp;&nbsp;● Shareholders' equity decreased $16.2 million, or 1.9%, to $842.8 million, from $858.9 million in the prior quarter, primarily as a result of the repurchase of 1,288,509 shares of common stock at an all-in weighted average cost of $21.55 per share totaling $27.8 million and $3.2 million in dividends paid during the current quarter, partially offset by net income of $15.0 million. Shareholders' equity to total assets and tangible shareholders' equity <sup>(1)</sup> to tangible assets were 11.7% and 11.2% respectively, at the end of the current quarter, compared to 12.3% and 11.8%, respectively, at the end of the prior quarter.

**NET INTEREST INCOME**

Net interest income was $64.9 million for the current quarter, compared to $58.8 million for the prior quarter, an increase of $6.1 million, or 10.4%. Net interest margin expanded 2 basis points to 3.94% for the current quarter, from 3.92% in the prior quarter.

&nbsp;&nbsp;&nbsp;&nbsp;● The increase in interest income during the current quarter was primarily attributable to an increase in the average balance of loans as a result of the continued execution of our growth strategy.

&nbsp;&nbsp;&nbsp;&nbsp;● The increase in interest expense for the current quarter was primarily driven by increases in the average balances of money market and certificates of deposit and individual retirement accounts, partially offset by a decrease in the weighted average rate on money market and certificates of deposit and individual retirement accounts.

&nbsp;&nbsp;&nbsp;&nbsp;● The ending balance of gross loans of $6.21 billion, is $119.7 million or 2.0%, higher than the average balance of gross loans at the end of the quarter, primarily the result of one large cannabis loan of $115.0 million closing near the end of the quarter, which did not have a significant impact on the yield during the current quarter.

**PROVISION FOR CREDIT LOSSES**

Provision for credit losses increased $7.4 million, or 695.9%, to a provision for credit losses of $6.3 million for the current quarter, compared to a release of credit losses of $1.1 million for the prior quarter.

&nbsp;&nbsp;&nbsp;&nbsp;● The provision for credit losses on loans amounted to $6.4 million for the current quarter, compared to a release of $1.6 million for the prior quarter, representing an increase of $7.9 million, or 510.4%, primarily driven by grow th in the balance of commercial and industrial loans, along with increased peer commercial real estate credit losses impacting quantitative reserves, and an elevated qualitative factor risk grade for the commercial and industrial portfolio.

&nbsp;&nbsp;&nbsp;&nbsp;● The release of credit losses on unfunded commitments was $54 thousand for the current quarter, compared to a provision of $493 thousand for the prior quarter, representing a decrease of $547 thousand, or 111.0%, primarily driven by n et unfunded commitments increasing $58 million in the prior quarter, compared to $14.5 million in the current quarter.

**NONINTEREST INCOME**

Noninterest income was $4.5 million for the current quarter, compared to $4.4 million for the prior quarter, representing an increase of $111 thousand, or 2.5%.

&nbsp;&nbsp;&nbsp;&nbsp;● Loss on sale of loans, net, was $1 thousand for the current quarter, compared to $519 thousand in the prior quarter, representing a decrease of $518 thousand, or 99.8%, resulting from the adjustment to record a $66.4 million consumer loan portfolio at fair value, which transferred to loans held for sale during the prior quarter.

&nbsp;&nbsp;&nbsp;&nbsp;● Swap contract income was $201 thousand for the current quarter, compared to $677 thousand in the prior quarter, representing a decrease of $476 thousand, or 70.3%, due to decreased swap contract demand.

&nbsp;&nbsp;&nbsp;&nbsp;● Customer service fees were $3.1 million for the current quarter, compared to $2.9 million in the prior quarter, representing an increase of $235 thousand, or 8.1%, due to increased cash management fees and customer transactional volume.

&nbsp;&nbsp;&nbsp;&nbsp;● Other income was $210 thousand, compared to $442 thousand in the prior quarter, resulting in a decrease of $232 thousand, or 52.5%, from the recognition of a higher amount of preferred dividends from solar tax credit investments during the prior quarter.

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**NONINTEREST EXPENSE**

Noninterest expense for the current quarter was $42.7 million, representing a decrease of $6.6 million, or 13.4%, from $49.3 million for the prior quarter.

&nbsp;&nbsp;&nbsp;&nbsp;● Merger and acquisition expenses were $534 thousand for the current quarter, compared to $15.7 million for the prior quarter, representing a $15.2 million, or 96.6%, decrease due to the completion of the Provident acquisition in the prior quarter.

&nbsp;&nbsp;&nbsp;&nbsp;● Salaries and employee benefits expenses were $25.5 million for the current quarter, compared to $21.1 million for the prior quarter, representing a $4.3 million, or 20.5%, increase resulting from a full quarter of increased headcount from the Provident acquisition and continued growth.

&nbsp;&nbsp;&nbsp;&nbsp;● Director and professional service fee expenses were $4.0 million for the current quarter, compared to $2.5 million for the prior quarter, representing an increase of $1.5 million, or 62.0%, resulting from a $500 thousand one-time business expansion fee, legal fees from contract reviews and director stock compensation from grants made during the current quarter.

&nbsp;&nbsp;&nbsp;&nbsp;● Data processing expenses were $4.4 million for the current quarter, compared to $3.3 million for the prior quarter, representing an increase of $1.1 million, or 32.7%, primarily driven by our significant investment in technology and systems in support of upcoming revenue initiatives, requiring the operation of systems in parallel for a period of time, as well as a full quarter of increased transactional volume from the Provident acquisition.

&nbsp;&nbsp;&nbsp;&nbsp;● General and administrative expenses were $3.5 million for the current quarter, compared to $2.8 million for the prior quarter, representing an increase of $711 thousand, or 25.2%, mainly a result of a full quarter of amortization of the Provident core deposit intangible.

**INCOME TAXES**

Income tax expense for the current quarter was $5.4 million, representing a $1.8 million, or 25.2%, decrease from $7.2 million for the prior quarter. The decrease was primarily driven by the reduction in non-deductible merger and acquisition expenses and BOLI surrender tax and penalty. The effective tax rate and the operating effective tax rate<sup>(1)</sup> were 26.4% and 26.2%, respectively, for the current quarter, compared to 48.2% and 30.8%, respectively, for the prior quarter. The primary drivers of the decrease in the effective tax rate were gain on BOLI surrender of $6.2 million and non-deductible merger and acquisition expenses of $1.9 million during the prior quarter.

**COMMERCIAL REAL ESTATE PORTFOLIO**

Commercial real estate loans increased $21.5 million, or 0.9%, to $2.46 billion, during the current quarter.

&nbsp;&nbsp;&nbsp;&nbsp;● Cannabis facility commercial real estate loans decreased $1.2 million, or 0.6%, to $213.8 million during the current quarter. The Company's cannabis facility commercial real estate portfolio is secured entirely by the underlying commercial real estate of the borrower operation, in addition to, in most cases, a lien on all business assets. The vast majority of the cannabis facility loan portfolio balances have a loan-to-value ratio of 65% or lower, with appraisal reports taking a blended approach (using both cannabis and non-cannabis use comparable real estate sales, which we believe are generally more conservative).

&nbsp;&nbsp;&nbsp;&nbsp;● The cannabis facility portfolio has geographic dispersion, with lower dollar exposure loans remaining local and larger dollar exposure loans generally tied to multi-state operators with a more national footprint. All cannabis facility loan relationships were current at the end of the current quarter.

&nbsp;&nbsp;&nbsp;&nbsp;● The Company's multi-family real estate loan portfolio increased $20.6 million, or 4.0%, during the current quarter to $538.2 million. The Company's multi-family real estate loan portfolio consists of properties primarily located in the Greater Boston area, all of which are adjustable-rate loans and performing at the end of the current quarter.

&nbsp;&nbsp;&nbsp;&nbsp;● The Company's $323.3 million office portfolio consists principally of suburban Class A and B office space used as medical and traditional offices. The portfolio does not consist of high-rise towers located in Boston.

**ASSET QUALITY**

&nbsp;&nbsp;&nbsp;&nbsp;● The allowance for credit losses ("ACL") amounted to $80.2 million as of March 31, 2026, or 1.29% of total loans, compared to $87.4 million, or 1.46% of total loans at December 31, 2025.

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

&nbsp;&nbsp;&nbsp;&nbsp;● The Company recorded a provision for credit losses of $6.3 million during the current quarter, which included a provision for $6.4 million for loans and a release of $54 thousand for unfunded commitments, compared to a release of credit losses of $1.1 million during the prior quarter, which included a release of $1.6 million for loans and a provision of $493 thousand for unfunded commitments.

&nbsp;&nbsp;&nbsp;&nbsp;● The decrease in the ACL for the current quarter was primarily driven by the $10.6 million partial charge-off of a purchased credit deteriorated ("PCD") commercial and industrial loan, which carried a $10.8 million reserve, partially offset by increases in ACL balance from provisions for credit losses as a result of loan growth, larger peer commercial real estate credit losses realized in the prior quarter impacting quantitative reserves, and an elevated qualitative factor risk grade for the commercial and industrial portfolio.

&nbsp;&nbsp;&nbsp;&nbsp;● Non-performing loans ("NPLs") totaled $45.6 million as of March 31, 2026, an increase of $2.2 million, or 5.1%, from $43.4 million at the end of the prior quarter. The increase was primarily due to the increase in commercial and industrial loans on non-accrual of $2.6 million, partially offset by reductions in one-to-four family residential loans on non-accrual.

&nbsp;&nbsp;&nbsp;&nbsp;● During the current quarter, the Company recorded total net charge-offs of $13.6 million, or 0.91% of average total loans on an annualized basis, which included $12.4 million and $1.2 million in net charge-offs on PCD and non-PCD loans, respectively, compared to net charge-offs of $4.4 million, or 0.32% of average total loans on an annualized basis, in the prior quarter. The increase in net charge-offs during the current quarter was primarily a result of $12.4 million in charge-offs on previously reserved for PCD commercial and industrial loans. Charge-offs on non-PCD loans declined $3.2 million during the current quarter as a result of a $3.8 million charge-off on a previously reserved for commercial and industrial loan during the prior quarter.

&nbsp;&nbsp;&nbsp;&nbsp;● As part of its ongoing credit risk management framework and prudent oversight, the Company periodically reviews lending relationships across all portfolios to ensure alignment with its risk appetite, regulatory expectations, and evolving market conditions.

&nbsp;&nbsp;&nbsp;&nbsp;● The Company's loan portfolio consists primarily of commercial real estate and multi-family loans, one-to-four-family residential real estate loans, construction and land development loans, commercial and industrial loans, mortgage warehouse loans and consumer loans. These loans are primarily made to individuals and businesses located in our primary lending market area, which is the Greater Boston metropolitan area and surrounding communities in Massachusetts, southern New Hampshire, eastern Connecticut and Rhode Island

&nbsp;&nbsp;&nbsp;&nbsp;(1) <sup>Represents a non-GAAP measure. See Non-GAAP reconciliation of the corresponding GAAP measures on page 13.</sup> 

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**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. Needham Bank also provides services to companies in the cannabis industry by providing loans and deposits, along with supporting payment platforms in this industry, such as Mosaic and Corduro.

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.

**Non-GAAP Financial Measures** 

In addition to results presented in accordance with accounting principles generally accepted in the United States of America ("GAAP"), this press release contains certain non-GAAP financial measures, including pre-provision net revenue, operating net income, operating pre-tax income, operating noninterest expense, operating noninterest income, operating effective tax rate, operating earnings per share, basic, operating earnings per share, diluted, operating return on average assets, operating return on average shareholders' equity, operating efficiency ratio, tangible shareholders' equity, tangible assets and tangible book value per share. The Company's management believes that the supplemental non-GAAP information is utilized by regulators and market analysts to evaluate a Company's financial condition and therefore, such information is useful to investors. These disclosures should not be viewed as a substitute for financial results determined in accordance with GAAP, nor are they necessarily comparable to non-GAAP performance measures that may be presented by other companies. Because non-GAAP financial measures are not standardized, it may not be possible to compare these financial measures with other companies' non-GAAP financial measures having the same or similar names.

**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; risks related to the Company's acquisitions generally,

------

including disruption to current plans and operations; difficulties in customer and employee retention; fees, expenses and charges related to these transactions being significantly higher than anticipated; unforeseen integration issues or impairment of other intangibles; and the Company's inability to achieve expected revenues, cost savings, synergies, and other benefits at levels or within the timeframes originally anticipated; 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.

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| | | | |
|:---|:---|:---|:---|
| **NB BANCORP, INC.** |  |  |  |
| **SELECTED FINANCIAL HIGHLIGHTS** |  |  |  |
| **(Unaudited)** |  |  |  |
| **(Dollars in thousands, except per share data)** |  |  |  |
|  | **As of and for the three months ended** | **As of and for the three months ended** | **As of and for the three months ended** |
|  | **March 31, 2026** | **December 31, 2025** | **March 31, 2025** |
| **Earnings data** |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Net interest income | $64868 | $58752 | $43526 |
| &nbsp;&nbsp;&nbsp;&nbsp;Noninterest income | 4513 | 4402 | 3882 |
| &nbsp;&nbsp;&nbsp;&nbsp;Total revenue | 69381 | 63154 | 47408 |
| &nbsp;&nbsp;&nbsp;&nbsp;Provision for credit losses | 6328 | (1062) | 1158 |
| &nbsp;&nbsp;&nbsp;&nbsp;Noninterest expense | 42701 | 49334 | 28681 |
| &nbsp;&nbsp;&nbsp;&nbsp;Pre-tax income | 20352 | 14882 | 17569 |
| &nbsp;&nbsp;&nbsp;&nbsp;Net income | 14984 | 7707 | 12655 |
| &nbsp;&nbsp;&nbsp;&nbsp;Operating net income (non-GAAP) | 15791 | 21200 | 13693 |
| &nbsp;&nbsp;&nbsp;&nbsp;Operating noninterest expense (non-GAAP) | 41667 | 33594 | 27464 |
| **Per share data** |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Earnings per share, basic | $0.37 | $0.19 | $0.33 |
| &nbsp;&nbsp;&nbsp;&nbsp;Earnings per share, diluted | 0.36 | 0.19 | 0.33 |
| &nbsp;&nbsp;&nbsp;&nbsp;Operating earnings per share, basic (non-GAAP) | 0.39 | 0.52 | 0.35 |
| &nbsp;&nbsp;&nbsp;&nbsp;Operating earnings per share, diluted (non-GAAP) | 0.38 | 0.51 | 0.35 |
| &nbsp;&nbsp;&nbsp;&nbsp;Book value per share | 18.83 | 18.77 | 18.23 |
| &nbsp;&nbsp;&nbsp;&nbsp;Tangible book value per share (non-GAAP) | 18.00 | 17.94 | 18.20 |
| **Profitability** |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Return on average assets | 0.87% | 0.49% | 1.00% |
| &nbsp;&nbsp;&nbsp;&nbsp;Operating return on average assets (non-GAAP) | 0.92% | 1.35% | 1.08% |
| &nbsp;&nbsp;&nbsp;&nbsp;Return on average shareholders' equity | 7.05% | 3.82% | 6.78% |
| &nbsp;&nbsp;&nbsp;&nbsp;Operating return on average shareholders' equity (non-GAAP) | 7.43% | 10.51% | 7.33% |
| &nbsp;&nbsp;&nbsp;&nbsp;Net interest margin | 3.94% | 3.92% | 3.61% |
| &nbsp;&nbsp;&nbsp;&nbsp;Cost of deposits | 2.73% | 2.86% | 3.11% |
| &nbsp;&nbsp;&nbsp;&nbsp;Efficiency ratio | 61.55% | 78.12% | 60.50% |
| &nbsp;&nbsp;&nbsp;&nbsp;Operating efficiency ratio (non-GAAP) | 60.06% | 53.19% | 57.93% |
| **Balance sheet, end of period** |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Total assets | $7226437 | $7006130 | $5242157 |
| &nbsp;&nbsp;&nbsp;&nbsp;Total loans | 6209910 | 5986140 | 4464303 |
| &nbsp;&nbsp;&nbsp;&nbsp;Total deposits | 6096988 | 5853534 | 4326617 |
| &nbsp;&nbsp;&nbsp;&nbsp;Total shareholders' equity | 842778 | 858932 | 739611 |
| **Asset quality** |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;ACL | $80195 | $87411 | $38338 |
| &nbsp;&nbsp;&nbsp;&nbsp;ACL / Total NPLs | 176.0% | 201.5% | 337.1% |
| &nbsp;&nbsp;&nbsp;&nbsp;Total NPLs / Total loans | 0.73% | 0.72% | 0.25% |
| &nbsp;&nbsp;&nbsp;&nbsp;Annualized net charge-offs / Average total loans | (0.91)% | (0.32)% | (0.13)% |
| **Capital ratios** |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Shareholders' equity / Total assets | 11.66% | 12.26% | 14.11% |
| &nbsp;&nbsp;&nbsp;&nbsp;Tangible shareholders' equity / tangible assets (non-GAAP) | 11.21% | 11.78% | 14.09% |

---

------

---

| | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|
| **NB BANCORP, INC.** |  |  |  |  |  |  |  |
| **CONSOLIDATED BALANCE SHEETS** |  |  |  |  |  |  |  |
| **(Unaudited)** |  |  |  |  |  |  |  |
| **(Dollars in thousands, except share and per share data)** |  |  |  |  |  |  |  |
|  | **As of** | **As of** | **As of** | **March 31, 2026 change from** | **March 31, 2026 change from** | **March 31, 2026 change from** | **March 31, 2026 change from** |
|  | **March 31, 2026** | **December 31, 2025** | **March 31, 2025** | **December 31, 2025** | **December 31, 2025** | **March 31, 2025** | **March 31, 2025** |
| **Assets** |  |  |  |  |  |  |  |
| Cash and due from banks | $327739 | $325711 | $201140 | $2028 | 0.6% | $126599 | 62.9% |
| Federal funds sold | 47618 | 81885 | 112306 | (34267) | (41.8)% | (64688) | (57.6)% |
| &nbsp;&nbsp;&nbsp;&nbsp;Total cash and cash equivalents | 375357 | 407596 | 313446 | (32239) | (7.9)% | 61911 | 19.8% |
| Available-for-sale securities, at fair value | 277241 | 268959 | 234680 | 8282 | 3.1% | 42561 | 18.1% |
| Loans held for sale, at fair value | 63971 | 66447 | - | (2476) | (3.7)% | 63971 | 0.0% |
| Loans receivable, net of deferred fees | 6209910 | 5986140 | 4464303 | 223770 | 3.7% | 1745607 | 39.1% |
| Allowance for credit losses | (80195) | (87411) | (38338) | 7216 | (8.3)% | (41857) | 109.2% |
| &nbsp;&nbsp;&nbsp;&nbsp;Net loans | 6129715 | 5898729 | 4425965 | 230986 | 3.9% | 1703750 | 38.5% |
| Accrued interest receivable | 27150 | 25390 | 19533 | 1760 | 6.9% | 7617 | 39.0% |
| Banking premises and equipment, net | 47335 | 46209 | 34069 | 1126 | 2.4% | 13266 | 38.9% |
| Non-public investments | 40738 | 33740 | 24710 | 6998 | 20.7% | 16028 | 64.9% |
| Bank-owned life insurance ("BOLI") | 110586 | 104335 | 103688 | 6251 | 6.0% | 6898 | 6.7% |
| Prepaid expenses and other assets | 67749 | 68079 | 55305 | (330) | (0.5)% | 12444 | 22.5% |
| Goodwill | 18512 | 18512 | - | - | 0.0% | 18512 | 0.0% |
| Core deposit intangible, net | 18411 | 19303 | 1042 | (892) | (4.6)% | 17369 | 1666.9% |
| Deferred income tax asset, net | 49672 | 48831 | 29719 | 841 | 1.7% | 19953 | 67.1% |
| &nbsp;&nbsp;&nbsp;&nbsp;**Total assets** | $7226437 | $7006130 | $5242157 | $220307 | 3.1% | $1984280 | 37.9% |
| **Liabilities and shareholders' equity** |  |  |  |  |  |  |  |
| Deposits |  |  |  |  |  |  |  |
| &nbsp;&nbsp;&nbsp;Core deposits | $5526936 | $5317853 | $4017378 | $209083 | 3.9% | $1509558 | 37.6% |
| &nbsp;&nbsp;&nbsp;Brokered deposits | 570052 | 535681 | 309239 | 34371 | 6.4% | 260813 | 84.3% |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Total deposits | 6096988 | 5853534 | 4326617 | 243454 | 4.2% | 1770371 | 40.9% |
| Mortgagors' escrow accounts | 4858 | 5193 | 4464 | (335) | (6.5)% | 394 | 8.8% |
| Federal Home Loan Bank ("FHLB") borrowings | 189701 | 196235 | 90835 | (6534) | (3.3)% | 98866 | 108.8% |
| Accrued expenses and other liabilities | 70983 | 70716 | 60344 | 267 | 0.4% | 10639 | 17.6% |
| Accrued retirement liabilities | 21129 | 21520 | 20286 | (391) | (1.8)% | 843 | 4.2% |
| &nbsp;&nbsp;&nbsp;&nbsp;**Total liabilities** | 6383659 | 6147198 | 4502546 | 236461 | 3.8% | 1881113 | 41.8% |
| **Shareholders' equity:** |  |  |  |  |  |  |  |
| Preferred stock, $0.01 par value, 5,000,000 shares authorized; no shares |  |  |  |  |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;issued and outstanding | - | - | - | - | 0.0% | - | 0.0% |
| Common stock, $0.01 par value, 120,000,000 shares authorized; 44,765,178 issued and |  |  |  |  |  |  |  |
| &nbsp;&nbsp;&nbsp;outstanding at March 31, 2026, 45,770,128 issued and outstanding at December 31, 2025 |  |  |  |  |  |  |  |
| &nbsp;&nbsp;&nbsp;and 40,570,433 issued and outstanding at March 31, 2025 | 448 | 458 | 406 | (10) | (2.2)% | 42 | 10.3% |
| Additional paid-in capital | 432858 | 458864 | 376773 | (26006) | (5.7)% | 56085 | 14.9% |
| Unallocated common shares held by the Employee Stock Ownership Plan ("ESOP") | (41873) | (42454) | (44231) | 581 | (1.4)% | 2358 | (5.3)% |
| Retained earnings | 456978 | 445200 | 413128 | 11778 | 2.6% | 43850 | 10.6% |
| Accumulated other comprehensive loss | (5633) | (3136) | (6465) | (2497) | 79.6% | 832 | (12.9)% |
| &nbsp;&nbsp;&nbsp;&nbsp;**Total shareholders' equity** | 842778 | 858932 | 739611 | (16154) | (1.9)% | 103167 | 13.9% |
| &nbsp;&nbsp;&nbsp;&nbsp;**Total liabilities and shareholders' equity** | $7226437 | $7006130 | $5242157 | $220307 | 3.1% | $1984280 | 37.9% |

---

------

---

| | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|
| **NB BANCORP, INC.** |  |  |  |  |  |  |  |
| **CONSOLIDATED STATEMENTS OF INCOME** |  |  |  |  |  |  |  |
| **(Unaudited)** |  |  |  |  |  |  |  |
| **(Dollars in thousands, except share and per share data)** |  |  |  |  |  |  |  |
|  |  |  |  | **Three Months Ended March 31, 2026** | **Three Months Ended March 31, 2026** | **Three Months Ended March 31, 2026** | **Three Months Ended March 31, 2026** |
|  | **For the Three Months Ended**  | **For the Three Months Ended**  | **For the Three Months Ended**  | **Change From Three Months Ended** | **Change From Three Months Ended** | **Change From Three Months Ended** | **Change From Three Months Ended** |
|  | **March 31, 2026** | **December 31, 2025** | **March 31, 2025** | **December 31, 2025** | **December 31, 2025** | **March 31, 2025** | **March 31, 2025** |
| **INTEREST AND DIVIDEND INCOME** |  |  |  |  |  |  |  |
| Interest and fees on loans | $100042 | $91485 | $71440 | $8557 | 9.4% | $28602 | 40.0% |
| Interest on securities | 2708 | 2658 | 2290 | 50 | 1.9% | 418 | 18.3% |
| Interest and dividends on cash equivalents and other | 2936 | 3219 | 3121 | (283) | (8.8)% | (185) | (5.9)% |
| &nbsp;&nbsp;&nbsp;&nbsp;Total interest and dividend income | 105686 | 97362 | 76851 | 8324 | 8.5% | 28835 | 37.5% |
| **INTEREST EXPENSE** |  |  |  |  |  |  |  |
| Interest on deposits | 39579 | 37677 | 32239 | 1902 | 5.0% | 7340 | 22.8% |
| Interest on borrowings | 1239 | 933 | 1086 | 306 | 32.8% | 153 | 14.1% |
| &nbsp;&nbsp;&nbsp;&nbsp;Total interest expense | 40818 | 38610 | 33325 | 2208 | 5.7% | 7493 | 22.5% |
| **NET INTEREST INCOME** | 64868 | 58752 | 43526 | 6116 | 10.4% | 21342 | 49.0% |
| **PROVISION FOR CREDIT LOSSES** |  |  |  |  |  |  |  |
| Provision for (release of) credit losses - loans | 6382 | (1555) | 947 | 7937 | (510.4)% | 5435 | 573.9% |
| (Release of) provision for credit losses - unfunded commitments | (54) | 493 | 211 | (547) | (111.0)% | (265) | (125.6)% |
| &nbsp;&nbsp;&nbsp;&nbsp;Total provision for (release of) credit losses | 6328 | (1062) | 1158 | 7390 | (695.9)% | 5170 | 446.5% |
| **NET INTEREST INCOME AFTER** |  |  |  |  |  |  |  |
| **PROVISION FOR (RELEASE OF) CREDIT LOSSES** | 58540 | 59814 | 42368 | (1274) | (2.1)% | 16172 | 38.2% |
| **NONINTEREST INCOME** |  |  |  |  |  |  |  |
| Customer service fees | 3131 | 2896 | 2558 | 235 | 8.1% | 573 | 22.4% |
| Increase in cash surrender value of BOLI | 853 | 844 | 1031 | 9 | 1.1% | (178) | (17.3)% |
| Mortgage banking income | 119 | 62 | 149 | 57 | 91.9% | (30) | (20.1)% |
| Swap contract income | 201 | 677 | 88 | (476) | (70.3)% | 113 | 128.4% |
| (Loss) gain on sale of loans, net | (1) | (519) | 27 | 518 | (99.8)% | (28) | (103.7)% |
| Other income | 210 | 442 | 29 | (232) | (52.5)% | 181 | 624.1% |
| &nbsp;&nbsp;&nbsp;&nbsp;Total noninterest income | 4513 | 4402 | 3882 | 111 | 2.5% | 631 | 16.3% |
| **NONINTEREST EXPENSE** |  |  |  |  |  |  |  |
| Salaries and employee benefits | 25468 | 21134 | 19149 | 4334 | 20.5% | 6319 | 33.0% |
| Director and professional service fees | 4049 | 2500 | 2148 | 1549 | 62.0% | 1901 | 88.5% |
| Occupancy and equipment expenses | 2491 | 1954 | 1580 | 537 | 27.5% | 911 | 57.7% |
| Data processing expenses | 4439 | 3344 | 2765 | 1095 | 32.7% | 1674 | 60.5% |
| Marketing and charitable contribution expenses | 1033 | 1087 | 846 | (54) | (5.0)% | 187 | 22.1% |
| FDIC and state insurance assessments | 1152 | 751 | 813 | 401 | 53.4% | 339 | 41.7% |
| Merger and acquisition expenses | 534 | 15740 | - | (15206) | (96.6)% | 534 | 0.0% |
| General and administrative expenses | 3535 | 2824 | 1380 | 711 | 25.2% | 2155 | 156.2% |
| &nbsp;&nbsp;&nbsp;&nbsp;Total noninterest expense | 42701 | 49334 | 28681 | (6633) | (13.4)% | 14020 | 48.9% |
| **INCOME BEFORE TAXES** | 20352 | 14882 | 17569 | 5470 | 36.8% | 2783 | 15.8% |
| **INCOME TAX EXPENSE** | 5368 | 7175 | 4914 | (1807) | (25.2)% | 454 | 9.2% |
| **NET INCOME** | $14984 | $7707 | $12655 | $7277 | 94.4% | $2329 | 18.4% |
| Weighted average common shares outstanding, basic | 40969748 | 40870969 | 38755746 | 98779 | 0.2% | 2214002 | 5.7% |
| Weighted average common shares outstanding, diluted | 41421002 | 41172645 | 38755746 | 248357 | 0.6% | 2665256 | 6.9% |
| Earnings per share, basic | $0.37 | $0.19 | $0.33 | $0.18 | 94.7% | $0.04 | 12.1% |
| Earnings per share, diluted | $0.36 | $0.19 | $0.33 | $0.17 | 89.5% | $0.03 | 9.1% |

---

------

**NB BANCORP, INC.**

**AVERAGE BALANCES, INTEREST EARNED/PAID & AVERAGE YIELDS**

**(Unaudited)**

**(Dollars in thousands)**

---

| | | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|
|  | **For the Three Months Ended**  | **For the Three Months Ended**  | **For the Three Months Ended**  | **For the Three Months Ended**  | **For the Three Months Ended**  | **For the Three Months Ended**  | **For the Three Months Ended**  | **For the Three Months Ended**  | **For the Three Months Ended**  |
|  | **March 31, 2026** | **March 31, 2026** | **March 31, 2026** | **December 31, 2025** | **December 31, 2025** | **December 31, 2025** | **March 31, 2025** | **March 31, 2025** | **March 31, 2025** |
|  | **Average** <br>**Outstanding** <br>**Balance** | <br>**Interest** | <br>**Average** <br>**Yield/Rate** <sup>(4)</sup> | **Average** <br>**Outstanding** <br>**Balance** | <br>**Interest** | <br>**Average** <br>**Yield/Rate** <sup>(4)</sup> | **Average** <br>**Outstanding** <br>**Balance** | <br>**Interest** | <br>**Average** <br>**Yield/Rate** <sup>(4)</sup> |
| **Interest-earning assets:** |  |  |  |  |  |  |  |  |  |
| Loans <sup>(5)</sup> | $6090227 | $100042 | 6.66% | $5410208 | $91485 | 6.71% | $4366206 | $71440 | 6.64% |
| Securities | 273308 | 2708 | 4.02% | 250435 | 2658 | 4.21% | 230406 | 2290 | 4.03% |
| Other investments <sup>(5)</sup> | 28275 | 265 | 3.80% | 25659 | 627 | 9.69% | 27529 | 219 | 3.23% |
| Short-term investments <sup>(5)</sup> | 290385 | 2671 | 3.73% | 265146 | 2592 | 3.88% | 264343 | 2902 | 4.45% |
| &nbsp;&nbsp;&nbsp;Total interest-earning assets | 6682195 | 105686 | 6.41% | 5951448 | 97362 | 6.49% | 4888484 | 76851 | 6.38% |
| Non-interest-earning assets | 375966 |  |  | 344709 |  |  | 296729 |  |  |
| Allowance for credit losses | (88102) |  |  | (68363) |  |  | (38685) |  |  |
| &nbsp;&nbsp;&nbsp;Total assets | $6970059 |  |  | $6227794 |  |  | $5146528 |  |  |
| **Interest-bearing liabilities:** |  |  |  |  |  |  |  |  |  |
| Savings accounts | $207681 | 263 | 0.51% | $164423 | 217 | 0.52% | $113750 | 46 | 0.16% |
| NOW accounts | 639347 | 2006 | 1.27% | 557988 | 1601 | 1.14% | 470469 | 1074 | 0.93% |
| Money market accounts | 1711672 | 12732 | 3.02% | 1435761 | 11602 | 3.21% | 1073041 | 8716 | 3.29% |
| Certificates of deposit and individual retirement accounts | 2497213 | 24578 | 3.99% | 2351324 | 24257 | 4.09% | 1979184 | 22403 | 4.59% |
| &nbsp;&nbsp;&nbsp;Total interest-bearing deposits | 5055913 | 39579 | 3.17% | 4509496 | 37677 | 3.31% | 3636444 | 32239 | 3.60% |
| FHLB borrowings | 135441 | 1239 | 3.71% | 92927 | 933 | 3.98% | 91168 | 1086 | 4.83% |
| &nbsp;&nbsp;&nbsp;Total interest-bearing liabilities | 5191354 | 40818 | 3.19% | 4602423 | 38610 | 3.33% | 3727612 | 33325 | 3.63% |
| Non-interest-bearing deposits | 819830 |  |  | 720467 |  |  | 571552 |  |  |
| Other non-interest-bearing liabilities | 97370 |  |  | 104914 |  |  | 90023 |  |  |
| &nbsp;&nbsp;&nbsp;Total liabilities | 6108554 |  |  | 5427804 |  |  | 4389187 |  |  |
| Shareholders' equity | 861505 |  |  | 799990 |  |  | 757341 |  |  |
| &nbsp;&nbsp;&nbsp;Total liabilities and shareholders' equity | $6970059 |  |  | $6227794 |  |  | $5146528 |  |  |
| Net interest income |  | $64868 |  |  | $58752 |  |  | $43526 |  |
| Net interest rate spread <sup>(1)</sup> |  |  | 3.22% |  |  | 3.16% |  |  | 2.75% |
| Net interest-earning assets <sup>(2)</sup> | $1490841 |  |  | $1349025 |  |  | $1160872 |  |  |
| Net interest margin <sup>(3)</sup> |  |  | 3.94% |  |  | 3.92% |  |  | 3.61% |
| Average interest-earning assets to interest-bearing liabilities | 128.72% |  |  | 129.31% |  |  | 131.14% |  |  |

---

(1) Net interest rate spread represents the difference between the weighted average yield on interest-earning assets and the weighted average rate of interest-bearing liabilities.

(2) Net interest-earning assets represent total interest-earning assets less total interest-bearing liabilities.

(3) Net interest margin represents net interest income divided by average total interest-earning assets.

(4) Annualized.

(5) Loans include loans held for sale, at fair value. Other investments are comprised of FRB stock, FHLB stock and swap collateral accounts. Short-term investments are comprised of cash and cash equivalents.

------

**NB BANCORP, INC.**

**COMMERCIAL REAL ESTATE BY COLLATERAL TYPE**

**(Unaudited)**

**(Dollars in thousands)**

---

| | | | | |
|:---|:---|:---|:---|:---|
|  | **March 31, 2026** | **March 31, 2026** | **March 31, 2026** | **March 31, 2026** |
|  | **Owner-Occupied** | **Non-Owner-Occupied** | **Balance** | **Percentage** |
| Multi-Family | $— | $538164 | $538164 | 21% |
| Office | 41929 | 281375 | 323304 | 13% |
| Hospitality | 39270 | 236798 | 276068 | 11% |
| Industrial | 128550 | 146492 | 275042 | 11% |
| Mixed-Use | 22506 | 199728 | 222234 | 9% |
| Cannabis Facility | 204766 | 8998 | 213764 | 9% |
| Retail | 53211 | 109978 | 163189 | 7% |
| Special Purpose | 86767 | 61678 | 148445 | 6% |
| Self Storage Facilities |  | 87590 | 87590 | 4% |
| Recreational Vehicle Parks | 13587 | 73922 | 87509 | 4% |
| Other | 51615 | 76102 | 127717 | 5% |
| &nbsp;&nbsp;Total commercial real estate | $642201 | $1820825 | $2463026 | 100% |

---

---

| | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|
|  | **Change From December 31, 2025** | **Change From December 31, 2025** | **Change From December 31, 2025** | **Change From December 31, 2025** | **Change From March 31, 2025** | **Change From March 31, 2025** | **Change From March 31, 2025** | **Change From March 31, 2025** |
|  | **Owner-Occupied** | **Non-Owner-Occupied** | **Balance** | **Percentage** | **Owner-Occupied** | **Non-Owner-Occupied** | **Balance** | **Percentage** |
| Multi-Family | $— | $20637 | $20637 | 4% | $— | $196545 | $196545 | 58% |
| Office | 2211 | 34804 | 37015 | 13% | 16187 | 120262 | 136449 | 73% |
| Hospitality | 2275 | (9515) | (7240) | (3)% | 39270 | 64513 | 103783 | 60% |
| Industrial | (25850) | (9810) | (35660) | (11)% | 4332 | 72697 | 77029 | 39% |
| Mixed-Use | (4535) | 2740 | (1795) | (1)% | 14853 | 87199 | 102052 | 85% |
| Cannabis Facility | (1157) | (87) | (1244) | (1)% | (102736) | (6178) | (108914) | (34)% |
| Retail | 8194 | 6132 | 14326 | 10% | 8795 | 22546 | 31341 | 24% |
| Special Purpose | (1760) | (533) | (2293) | (2)% | 8070 | 7493 | 15563 | 12% |
| Self Storage Facilities |  | 23275 | 23275 | 36% |  | 87590 | 87590 | 0% |
| Recreational Vehicle Parks | (1578) | (368) | (1946) | (2)% | 13587 | 73922 | 87509 | 0% |
| Other | (298) | (23321) | (23619) | (16)% | 11228 | 5252 | 16480 | 15% |
| &nbsp;&nbsp;Total commercial real estate | $(22498) | $43954 | $21456 | 1% | $13586 | $731841 | $745427 | 43% |

---

---

| | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|
|  | **December 31, 2025** | **December 31, 2025** | **December 31, 2025** | **December 31, 2025** | **March 31, 2025** | **March 31, 2025** | **March 31, 2025** | **March 31, 2025** |
|  | **Owner-Occupied** | **Non-Owner-Occupied** | **Balance** | **Percentage** | **Owner-Occupied** | **Non-Owner-Occupied** | **Balance** | **Percentage** |
| Multi-Family | $— | $517527 | $517527 | 21% | $— | 341619 | $341619 | 20% |
| Office | 39718 | 246571 | 286289 | 12% | 25742 | 161113 | 186855 | 11% |
| Hospitality | 36995 | 246313 | 283308 | 12% |  | 172285 | 172285 | 10% |
| Industrial | 154400 | 156302 | 310702 | 13% | 124218 | $73795 | 198013 | 12% |
| Mixed-Use | 27041 | 196988 | 224029 | 9% | 7653 | 112529 | 120182 | 7% |
| Cannabis Facility | 205923 | 9085 | 215008 | 9% | 307502 | 15176 | 322678 | 19% |
| Retail | 45017 | 103846 | 148863 | 6% | 44416 | 87432 | 131848 | 8% |
| Special Purpose | 88527 | 62211 | 150738 | 6% | 78697 | 54185 | 132882 | 8% |
| Self Storage Facilities |  | 64315 | 64315 | 3% |  |  |  | 0% |
| Recreational Vehicle Parks | 15165 | 74290 | 89455 | 4% |  |  |  | 0% |
| Other | 51913 | 99423 | 151336 | 5% | 40387 | 70850 | 111237 | 5% |
| &nbsp;&nbsp;Total commercial real estate | $664699 | $1776871 | $2441570 | 100% | $628615 | $1088984 | $1717599 | 100% |

---

------

---

| | | | |
|:---|:---|:---|:---|
| **NB BANCORP, INC.** |  |  |  |
| **NON-GAAP RECONCILIATION** |  |  |  |
| **(Unaudited)** |  |  |  |
| **(Dollars in thousands)** |  |  |  |
|  | **For the Three Months Ended**  | **For the Three Months Ended**  | **For the Three Months Ended**  |
|  | **March 31, 2026** | **December 31, 2025** | **March 31, 2025** |
| Net income (GAAP) | $14984 | $7707 | $12655 |
| **Add (Subtract):** |  |  |  |
| Adjustments to net income: |  |  |  |
| &nbsp;&nbsp;&nbsp;Defined benefit pension termination refund | - | - | 1217 |
| &nbsp;&nbsp;&nbsp;Non-recurring fees for business line expansion | 500 | - | - |
| &nbsp;&nbsp;&nbsp;BOLI surrender tax and modified endowment contract penalty | 50 | 2092 | 154 |
| &nbsp;&nbsp;&nbsp;Merger and acquisition expenses | 534 | 15740 | - |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Total adjustments to net income | $1084 | $17832 | $1371 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Less net tax benefit associated with pre-tax non-GAAP adjustments to net income | 277 | 4339 | 333 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Non-GAAP adjustments, net of tax | 807 | 13493 | 1038 |
| **Operating net income (non-GAAP)** | $15791 | $21200 | $13693 |
| Weighted average common shares outstanding, basic | 40969748 | 40870969 | 38755746 |
| Weighted average common shares outstanding, diluted | 41421002 | 41172645 | 38755746 |
| **Operating earnings per share, basic (non-GAAP)** | $0.39 | $0.52 | $0.35 |
| **Operating earnings per share, diluted (non-GAAP)** | $0.38 | $0.51 | $0.35 |
| Pre-tax income (GAAP) | $20352 | $14882 | $17569 |
| **Add (Subtract):** |  |  |  |
| Adjustments to pre-tax income: |  |  |  |
| &nbsp;&nbsp;&nbsp;Defined benefit pension termination refund | - | - | 1217 |
| &nbsp;&nbsp;&nbsp;Non-recurring fees for business line expansion | 500 | - | - |
| &nbsp;&nbsp;&nbsp;Merger and acquisition expenses | 534 | 15740 | - |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Total adjustments to pre-tax income | 1034 | 15740 | 1217 |
| **Operating pre-tax income (non-GAAP)** | $21386 | $30622 | $18786 |
| Noninterest expense (GAAP) | $42701 | $49334 | $28681 |
| **Subtract (Add):** |  |  |  |
| Adjustments to noninterest expense: |  |  |  |
| &nbsp;&nbsp;&nbsp;Defined benefit pension termination refund | $- | $- | $1217 |
| &nbsp;&nbsp;&nbsp;Non-recurring fees for business line expansion | 500 | - | - |
| &nbsp;&nbsp;&nbsp;Merger and acquisition expenses | 534 | 15740 | - |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Total impact of non-GAAP noninterest expense adjustments | $1034 | $15740 | $1217 |
| **Noninterest expense on an operating basis (non-GAAP)** | $41667 | $33594 | $27464 |
| Operating net income (non-GAAP) | $15791 | $21200 | $13693 |
| Average assets | 6970059 | 6227794 | 5146528 |
| **Operating return on average assets (non-GAAP)** | 0.92% | 1.35% | 1.08% |
| Average shareholders' equity | $861505 | $799990 | $757341 |
| **Operating return on average shareholders' equity (non-GAAP)** | 7.43% | 10.51% | 7.33% |
| Noninterest expense on an operating basis (non-GAAP) | $41667 | $33594 | $27464 |
| Total pre-provision net revenue (net interest income plus total noninterest income) | 69381 | 63154 | 47408 |
| **Operating efficiency ratio (non-GAAP)** | 60.06% | 53.19% | 57.93% |
| Income tax expense (GAAP) | $5368 | $7175 | $4914 |
| **Add (Subtract):** |  |  |  |
| Adjustments to income tax expense: |  |  |  |
| &nbsp;&nbsp;&nbsp;Net tax benefit associated with pre-tax non-GAAP adjustments to net income | 277 | 4339 | 333 |
| &nbsp;&nbsp;&nbsp;BOLI surrender tax and modified endowment contract penalty | (50) | (2092) | (154) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Total impact of non-GAAP income tax expense adjustments | $227 | $2247 | $179 |
| **Income tax expense on an operating basis (non-GAAP)** | $5595 | $9422 | $5093 |
| **Operating effective tax rate (non-GAAP)** | 26.2% | 30.8% | 27.1% |

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| | | | |
|:---|:---|:---|:---|
|  | **As of** | **As of** | **As of** |
|  | **March 31, 2026** | **December 31, 2025** | **March 31, 2025** |
| Total shareholders' equity (GAAP) | $842778 | $858932 | $739611 |
| **Subtract:** |  |  |  |
| &nbsp;&nbsp;&nbsp;Intangible assets (core deposit intangible and goodwill) | 36923 | 37815 | 1042 |
| **Total tangible shareholders' equity (non-GAAP)** | 805855 | 821117 | 738569 |
| Total assets (GAAP) | 7226437 | 7006130 | 5242157 |
| **Subtract:** |  |  |  |
| &nbsp;&nbsp;&nbsp;Intangible assets (core deposit intangible and goodwill) | 36923 | 37815 | 1042 |
| **Total tangible assets (non-GAAP)** | $7189514 | $6968315 | $5241115 |
| Tangible shareholders' equity / tangible assets (non-GAAP) | 11.21% | 11.78% | 14.09% |
| Total common shares outstanding | 44765178 | 45770128 | 40570443 |
| **Tangible book value per share (non-GAAP)** | $18.00 | $17.94 | $18.20 |

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**NB BANCORP, INC.**

**ASSET QUALITY – NON-PERFORMING ASSETS** <sup>(1)</sup>

**(Unaudited)**

**(Dollars in thousands)**

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| | | | |
|:---|:---|:---|:---|
|  | **March 31, 2026** | **December 31, 2025** | **March 31, 2025** |
| Real estate loans: |  |  |  |
| &nbsp;&nbsp;One-to-four-family residential | $1763 | $2712 | $3043 |
| &nbsp;&nbsp;Home equity | 1673 | 1359 | 1157 |
| &nbsp;&nbsp;Commercial real estate | 394 | 855 | 841 |
| &nbsp;&nbsp;Construction and land development | 10 | 10 | 10 |
| Commercial and industrial | 38885 | 36251 | 4560 |
| Consumer | 2838 | 2184 | 1761 |
| &nbsp;&nbsp;Total | $45563 | $43371 | $11372 |
| &nbsp;&nbsp;Total non-performing loans to total loans | 0.73% | 0.72% | 0.25% |
| &nbsp;&nbsp;&nbsp;&nbsp;Total non-performing PCD loans to total loans | 0.49% | 0.60% | 0.00% |
| &nbsp;&nbsp;&nbsp;&nbsp;Total non-performing non-PCD loans to total loans | 0.24% | 0.12% | 0.25% |
| &nbsp;&nbsp;Total non-performing assets to total assets  | 0.63% | 0.62% | 0.22% |
| &nbsp;&nbsp;&nbsp;&nbsp;Total non-performing PCD assets to total assets  | 0.42% | 0.51% | 0.00% |
| &nbsp;&nbsp;&nbsp;&nbsp;Total non-performing non-PCD assets to total assets  | 0.21% | 0.11% | 0.22% |

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(1) Non-performing loans and assets are comprised of non-accrual loans

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**NB BANCORP, INC.**

**ASSET QUALITY – PROVISION, ALLOWANCE, AND NET (CHARGE-OFFS) RECOVERIES**

**(Unaudited)**

**(Dollars in thousands)**

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| | | | |
|:---|:---|:---|:---|
|  | **For the Three Months Ended**  | **For the Three Months Ended**  | **For the Three Months Ended**  |
|  | **March 31, 2026** | **December 31, 2025** | **March 31, 2025** |
| Allowance for credit losses at beginning of the period | $87411 | $43052 | $38744 |
| &nbsp;&nbsp;&nbsp;Adjustment to allowance for Provident acquisition |  | 50271 |  |
| &nbsp;&nbsp;&nbsp;Provision for (release of) credit losses | 6382 | (1555) | 947 |
| &nbsp;&nbsp;&nbsp;Charge-offs: |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;One-to-Four-Family Residential | (56) |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Commercial & Industrial | (12370) | (3763) |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Consumer | (1409) | (1325) | (1558) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Commercial real estate |  | (17) |  |
| &nbsp;&nbsp;&nbsp;Total charge-offs | (13835) | (5105) | (1558) |
| &nbsp;&nbsp;&nbsp;Recoveries of loans previously charged off: |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Commercial and industrial | 12 | 562 | 12 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Consumer | 225 | 186 | 193 |
| &nbsp;&nbsp;&nbsp;Total recoveries | 237 | 748 | 205 |
| &nbsp;&nbsp;&nbsp;Net charge-offs | (13598) | (4357) | (1353) |
| Allowance for credit losses at end of the period | $80195 | $87411 | $38338 |
| Allowance to non-performing loans | 176% | 202% | 337.1% |
| Allowance to total loans outstanding at the end of the period | 1.29% | 1.46% | 0.86% |
| Annualized net charge-offs to average loans outstanding during the period | (0.91)% | (0.32)% | (0.13)% |
| &nbsp;&nbsp;&nbsp;Annualized net charge-offs to average loans outstanding during the period - PCD loans | (0.82)% | 0.00% | 0.00% |
| &nbsp;&nbsp;&nbsp;Annualized net charge-offs to average loans outstanding during the period - Non-PCD loans | (0.08)% | (0.32)% | (0.13)% |

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