Proxy Statement (Form DEF 14A)

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of

the Securities Exchange Act of 1934 (Amendment No.)

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NOTICE OF ANNUAL MEETING OF SHAREHOLDERS

Dear Shareholder:

You are invited to attend the 2025 annual meeting of shareholders of HarborOne Bancorp, Inc., which will be held on May 13, 2025 at 10:00 a.m., local time, at the offices of Goodwin Procter LLP, 100 NortheAvenue, Boston, MA 02210. The annual meeting will be held for the following purposes:

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In addition, shareholders may be asked to consider and vote upon any other matters that may properly be brought before the annual meeting and at any adjournments or postponements thereof.

Any action may be taken on the foregoing matters at the annual meeting on the date specified above, or on any date or dates to which the annual meeting may be adjourned, or to which the annual meeting may be postponed.

Our Board of Directors has fixed the close of business on March 14, 2025 as the record date for determining the shareholders entitled to notice of, and to vote at, the annual meeting and at any adjournments or postponements thereof.

Whether or not you plan to attend the annual meeting, please carefully read the proxy statement and other proxy materials and complete a proxy for your shares as soon as possible. You may authorize your proxy via the internet by following the instructions on the website indicated in the Notice of Internet Availability of Proxy Materials that you received in the mail. You also may request a paper or an e-mail copy of our proxy materials and a paper proxy card at any time. If you attend the annual meeting, you may vote at the meeting if you wish, even if you previously have submitted your proxy.

Brockton, Massachusetts
April 1, 2025

Important Notice Regarding the Availability of Proxy Materials for the Shareholder Meeting to be Held on May 13, 2025:This proxy statement and our 2024 Annual Report to Shareholders are available atwww.harboronebancorp.com.

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PROXY STATEMENT

FOR OUR 2025 ANNUAL MEETING OF SHAREHOLDERS
TO BE HELD ON MAY 13, 2025

This proxy statement is being made available to shareholders of HarborOne Bancorp, Inc. ("we," "us," "our," "ours" and the "Company") in connection with the solicitation of proxies by the Board of Directors (the "Board") for use at our 2025 annual meeting of shareholders to be held on May 13, 2025, at 10:00 a.m., local time, at the offices of Goodwin Procter LLP, 100 NortheAvenue, Boston, MA 02210, or at any postponement or adjournment of the annual meeting. This proxy statement and a form of proxy have been made available to our shareholders on the internet, and the Notice of Internet Availability of Proxy Materials has been mailed to shareholders on or about April 1, 2025.

QUESTIONS AND ANSWERS ABOUT THE ANNUAL MEETING

Who is entitled to vote at the annual meeting?

Holders of record of our common stock, $0.01 par value per share, at the close of business on March 14, 2025, the record date for the annual meeting, are entitled to receive notice of the annual meeting and to vote at the annual meeting. If you are a holder of record of our common stock as of the record date, you may vote the shares that you held on the record date even if you sell such shares after the record date. Each outstanding share of common stock as of the record date entitles its holder to cast one vote for each matter to be voted upon and, with respect to the election of directors, one vote for each director to be elected. Shareholders do not have the right to cumulate voting for the election of directors.

What is the purpose of the annual meeting?

At the annual meeting, you will be asked to vote on the following proposals:

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You also may be asked to consider and act upon any other matters that may properly be brought before the annual meeting and at any adjournments or postponements thereof.

What constitutes a quorum?

The presence, in person or by proxy, of holders of a majority of the votes entitled to be cast at the annual meeting is necessary to constitute a quorum for the transaction of any business at the annual meeting. As of March 14, 2025, there were 43,309,938 shares outstanding and entitled to vote at the annual meeting.

Each share of common stock outstanding on the record date is entitled to one vote on each matter properly submitted at the annual meeting and, with respect to the election of directors, one vote for each director to be elected. Abstentions and "broker non-votes" (i.e., shares represented at the meeting held by brokers, as to which instructions have not been received from the beneficial owners or persons entitled to vote such shares and with respect to which, on a particular matter, the broker does not have discretionary voting power to vote such shares)

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will be counted for purposes of determining whether a quorum is present for the transaction of business at the annual meeting.

What is a broker non-vote?

If you are a beneficial owner of shares held in a brokerage account and you do not instruct your broker, bank or other agent how to vote your shares, your broker, bank or other agent may still be able to vote your shares in its discretion. Under the rules of New York Stock Exchange("NYSE") (which in this matter also apply to Nasdaq-listed companies), brokers, banks and other securities intermediaries that are subject to NYSE rules may use their discretion to vote your uninstructed shares on matters considered to be "routine" under NYSE rules but not with respect to "non-routine" matters. A broker non-vote occurs when a broker, bank or other agent has not received voting instructions from the beneficial owner of the shares and the broker, bank, or other agent cannot vote the shares because the matter is considered "non-routine" under NYSE rules. Proposals 1, 3 and 4 are considered to be "non-routine" under NYSE rules such that your broker, bank or other agent may not vote your shares on those proposals in the absence of your voting instructions. Conversely, Proposal 2 is considered to be a "routine" matter under NYSE rules so that if you do not retuvoting instructions to your broker by its deadline, your shares may be voted by your broker in its discretion on Proposal 2. See below for a discussion of the impact on broker non-votes on vote counting.

What vote is required to approve each proposal?

With respect to Proposal 1, directors are elected by a plurality of the votes cast by the shares entitled to vote in the election. Abstentions, broker non-votes, and votes withheld with respect to Proposal 1 will have no effect on the election of directors. Proposals 2, 3 and 4 will be approved if the votes cast in favor of the proposal exceed the votes cast against the proposal. Abstentions and broker non-votes with respect to Proposals 2, 3 and 4 will have no effect on the votes for this proposal.

Can I change my vote after I submit my proxy card?

If you cast a vote by proxy, you may revoke it at any time before it is voted by:

If you attend the annual meeting, you may vote whether or not you previously have given a proxy, but your attendance (without further action) at the annual meeting will not constitute revocation of a previously given proxy.

You may revoke a proxy for shares held by a bank, broker or other nominee by submitting new voting instructions to the bank, broker or other nominee or, if you have obtained a legal proxy from the bank, broker or other nominee giving you the right to vote the shares at the annual meeting, by attending the annual meeting and voting.

How do I vote?

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Even if you plan to attend the annual meeting, we recommend that you submit a proxy to vote your shares in advance so that your vote will be counted if you later are unable to attend the annual meeting.

How is my vote counted?

If you authorize your proxy to vote your shares electronically via the Internet or, if you received a proxy card by mail and you properly marked, signed, dated and returned it, the shares that the proxy represents will be voted in the manner specified on the proxy. If no specification is made, your shares will be votedFORthe election of the nominees for the directors named in this proxy statement;FORthe ratification of the appointment of Crowe LLP as our independent registered public accounting firm for the fiscal year ending December 31, 2025;FORthe approval of the named executive officer compensation; and FOR the approval of the HarborOne Bancorp, Inc. 2025 Equity Incentive Plan. It is not anticipated that any matters other than those set forth in this proxy statement will be presented at the annual meeting. If other matters are presented, proxies will be voted at the discretion of the proxy holders.

How does the Board recommend that I vote on each of the proposals?

The Board recommends that you vote:

What other information should I review before voting?

Our 2024 Annual Report on Form 10-K, including our consolidated financial statements for the fiscal year ended December 31, 2024, is being made available to you along with this proxy statement. You may obtain, free of charge, copies of our 2024 annual report and the Annual Report on Form 10-K for the fiscal year ended December 31, 2024, which contain additional information about the Company, on our website atwww.harboronebancorp.comor by directing your request in writing to 770 Oak Street, Brockton, Massachusetts 02301, Attention: Investor Relations. The 2024 annual report and the Annual Report on Form 10-K are not part of the proxy solicitation materials, and the information found on, or accessible through, our website is not incorporated into, and does not

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form a part of, this proxy statement or any other report or document we file with or furnish to the Securities and Exchange Commission (the "SEC").

Who is soliciting my proxy?

This solicitation of proxies is made by and on behalf of the Board. We will pay the cost of the solicitation of proxies. In addition to the solicitation of proxies by mail, our directors, officers and employees may solicit proxies personally or by telephone. We have engaged Innisfree M&A Incorporated to solicit proxies held by brokers and nominees, and we will reimburse it for reasonable out-of-pocket expenses incurred in the solicitation of proxies.

Why didn't I automatically receive a paper copy of the proxy statement, proxy card and annual report?

Pursuant to rules adopted by the SEC, we have elected to provide access to our proxy materials via the internet. Accordingly, rather than paper copies of our proxy materials, we are sending a Notice of Internet Availability of Proxy Materials to our shareholders.

How can I change how I receive proxy materials in the future?

The Notice of Internet Availability of Proxy Materials includes instructions on how to access our proxy materials over the internet atwww.harboronebancorp.comand how to request a printed set of the proxy materials by mail or an electronic set of materials by e-mail.

Instead of receiving a Notice of Internet Availability of Proxy Materials in the mail, shareholders may elect to receive future proxy materials in printed form by mail or electronically by e-mail on an ongoing basis. Choosing to receive future proxy materials by e-mail will save the Company the cost of printing and mailing documents to you and will reduce the environmental impact of the annual meeting. If you choose to receive future proxy materials by e-mail, you will receive an e-mail next year with instructions containing a link to those materials and a link to the proxy voting site. You can change your election by sending a blank e-mail with the 16-digit control number on your proxy card tosendmaterial@proxyvote.com, via the internet atwww.proxyvote.comor by telephone at (800) 579-1639. Your election to receive future proxy materials by e-mail will remain in effect until you terminate it.

Participants in the ESOP and 401(k) Plan

If you participate in the HarborOne Bank Employee Stock Ownership Plan (the "ESOP") or if you hold Company common stock through the HarborOne 401(k) Plan (the "401(k) Plan"), you will receive vote authorization form(s) that reflect all shares you may direct trustees to vote on your behalf under the plans. Under the terms of the ESOP, the ESOP trustee will vote all shares held by the ESOP in the same proportion as shares for which it has received timely voting instructions. Each ESOP participant may direct the trustee how to vote the shares of common stock allocated to his or her account. HarborOne Bank, as plan administrator of the 401(k) Plan, will vote any shares in the 401(k) Plan for which participants have not issued voting instructions as HarborOne Bank determines in its discretion and will direct the 401(k) Plan trustee accordingly.The deadline for returning your voting instructions for shares that you hold in the ESOP and the 401(k) Plan, if any, is 11:59 p.m. on May 1, 2025.

If you have any questions about voting under the ESOP or the 401(k) Plan, please contact Inez H. Friedman-Boyce, Executive Vice President, Chief Legal Officer, General Counsel and Corporate Secretary.

No person is authorized on our behalf to give any information or to make any representations with respect to the proposals other than the information and the representations contained in this proxy statement, and, if given or made, such information and/or representations must not be relied upon as having been authorized.

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PROPOSAL 1: ELECTION OF DIRECTORS

Our articles of organization provide for a classified board of directors consisting of three classes of directors. At each annual meeting of shareholders, a class of directors will be elected for a term of office to expire at the third succeeding annual meeting of shareholders after their election and until their respective successors are duly elected and qualified. Our articles of organization provide that the size of our Board will be determined from time to time by resolution of our Board. The Board currently consists of ten members.

The Board, upon the recommendation of the Nominating and Governance Committee, has nominated Joseph F. Casey, Dr. Timothy R. Lynch, and Damian W. Wilmot, Esq. to serve as directors. Each of these nominees is a current director of the Company. The Board anticipates that each nominee will serve, if elected, as a director. However, if any nominee is unable to accept election, proxies voted in favor of such nominee will be voted for the election of such other person or persons as the Board may select. Directors are elected by a plurality of the votes cast by the shares entitled to vote in the election.

We will treat broker non-votes as shares that are present and entitled to vote for purposes of determining the presence or absence of a quorum. Abstentions and broker non-votes, if any, will have no effect on this proposal.

The Board unanimously recommends that you vote FOR each of the director nominees.

Information Regarding the Directors and Director Nominees

The following table sets forth certain information with respect to each director and director nominee, based upon information furnished by each director.

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The following includes a brief biography for each of our directors. There are no family relationships among any of our directors or executive officers. Unless otherwise stated, each director has held his or her current occupation for the last five years.

The biographical description below for each nominee includes specific experience, qualifications, attributes and skills that led to the conclusion by the Company's Nominating and Governance Committee and the Board of Directors that such person should serve as a director of the Company. The biographical description below for each director who is not standing for election includes the specific experience, qualifications, attributes and skills that the Company's Nominating and Governance Committee and the Board of Directors would expect to consider if it were making a conclusion currently as to whether such person should serve as a director. The Company's Nominating and Governance Committee and the Board of Directors did not currently evaluate whether these directors should serve as directors, as the terms for which they have been previously elected continue beyond the annual meeting.

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In addition to the information presented below regarding each person's specific experience, qualifications, attributes and skills that led our Board to the conclusion that he or she should serve as a director, we also believe all of our directors have a reputation for integrity, honesty and adherence to high ethical standards. They each have demonstrated business acumen and an ability to exercise sound judgment, as well as a commitment to service to the Company and its shareholders.

Each of the Company's directors currently serves as a director of HarborOne Bank (the "Bank").

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Biographical Information Regarding Executive Officers Who Are Not Directors

As of the date of this proxy statement, our executive officers who are not directors are as follows:

The following is a brief biography of each of our executive officers.

Brenda C. Diepoldjoined HarborOne Bank in September 2018 as Senior Vice President-Retail Banking and became Executive Vice President-Retail Banking in 2021 and Executive Vice President, Chief Banking Officer in 2023. Prior to joining HarborOne Bank, Ms. Diepold served as Director of Retail Sales, Operations and Support at Century Bank from 2016 to 2018; Senior Vice President, Director of Sales and Service Execution at Santander Bank, N.A. from 2013 to 2016 after starting her career at Fleet Bank, Boston, Massachusetts, and working in multiple positions of increasing authority while it was acquired and transitioned to Sovereign Bank, which subsequently became Santander Bank, N.A.

Stephen W. Finocchiojoined HarborOne Bancorp, Inc. and HarborOne Bank as Executive Vice President and Chief Financial Officer in April 2024. Prior to joining HarborOne Bank, Mr. Finocchio served as the Senior Managing Director, Treasurer for Berkshire Hills Bancorp from 2022 to 2024 and as Senior Vice President, Treasurer from 2021 to 2022. Mr. Finocchio held various roles at State Street Corporation from 2010 to 2021, including Managing Director - Global Treasury and Capital Management from 2019 to 2021, Managing Director - Global Treasury, Head of Quantitative Analytics from 2015 to 2019, and Senior Consultant - Global Corporate Strategy from 2010 to 2015. Earlier in his career, he served as Managing Director - Structured Finance for State Street Global Markets, LLC from 1995 to 2010. Mr. Finocchio received a B.B.A. in Finance from the University of Massachusetts' Isenberg School of Business and an M.B.A. from New York University's SteSchool of Business. He is also a Chartered Financial Analyst.

Inez H. Friedman-Boyce, Esq.joined HarborOne Bancorp, Inc. and HarborOne Bank as Senior Vice President-General Counsel and Corporate Secretary in 2019 and became Executive Vice President, Chief Legal Officer, General Counsel and Corporate Secretary in 2023. Prior to joining HarborOne Bank, Ms. Friedman-Boyce was a partner at Goodwin Procter LLP from 2005 to 2019, where she represented financial institutions in securities, corporate governance and complex business litigation matters. Ms. Friedman-Boyce began her legal career in 1995 at Testa, Hurwitz & Thibeault, LLP, where she was elected to the partnership in 2004. Ms. Friedman-Boyce also served as a Special Assistant District Attorney in the Middlesex County District Attorney's Office in 2000. Ms. Friedman-Boyce holds a B.A. from Amherst College and J.D. from Georgetown University Law Center, where she graduated with honors.

Brent W. Grablejoined HarborOne Bank as Senior Vice President, Chief Information Officer in 2023. Mr. Grable has over 20 years of experience in information technology and business transformation with an extensive background establishing and leading strategic and innovative initiatives in financial services and banking. Prior to joining HarborOne Bank, he served as Head of IT Finance at Santander Consumer USA and Head of IT Infrastructure Finance at Santander Bank. Other roles he held at Santander focused on platform management, program delivery, and transformation. He previously worked at both State Street Bank, Investors Bank and Trust,

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and State Street Global Advisors in various Operations and IT roles. Brent received his B.A. from Colgate University and M.B.A. from Babson College.

Joseph E. McQuadejoined HarborOne Bank as Senior Vice President and Chief Enterprise Risk Officer in 2020 and was promoted to Executive Vice President, Chief Enterprise Risk Officer in 2023. Prior to joining HarborOne Bank, Mr. McQuade was Senior Vice President and Chief Credit Officer for Consumer and Business Banking at Santander Bank, N.A. from 2015 to 2020 and Senior Vice President and Chief Operating Officer at Citizens Financial Group from 2009 to 2015. Mr. McQuade held various Risk Management roles at MasterCard and GE Capital from 2001 to 2009. Mr. McQuade holds a B.S. and M.B.A. from Union College.

H. Scott Sanbornjoined HarborOne Bank in 2014 and has been Executive Vice President-Chief Lending Officer since 2020. He served as Executive Vice President-Commercial Lending from 2018 to 2020 and Senior Vice President-Commercial Lending from 2014 to 2018. Prior to joining HarborOne Bank, Mr. Sanbowas Regional Vice President-Metro Boston & Rhode Island/SoutheasteMassachusetts from 2011 to 2014 and Professionals Group Leader, Wealth from 2010 to 2011 at TD Bank in Boston, Massachusetts, and Senior Vice President-Regional Executive & Professionals Market Leader from 2005 to 2010 and Senior Vice President-Market Manager from 2000 to 2004 at Sovereign Bank (now Santander Bank, N.A.) based in Boston, Massachusetts.

David E. Tryderhas served as Senior Vice President-Chief Marketing Officer since joining HarborOne Bank in 2014. Prior to joining HarborOne Bank, Mr. Tryder was Director-Digital Strategy Group in 2013, Director-Interactive & Relationship Marketing from 2009 to 2013, and Senior Manager-Interactive Marketing from 2005 to 2009 at Dunkin' Donuts in Canton, Massachusetts; Vice President-Marketing Director at Modem Media in Norwalk, Connecticut, from 2004 to 2005; Vice President-Marketing Director at Digitas, LLC in Boston, Massachusetts, from 2000 to 2004; and Product Manager-ATM Network and Online Banking at Fleet Bank in Boston, Massachusetts, from 1997 to 2000.

Susan Stewart, Senior Vice President-Chief Human Resources Officer, joined HarborOne Bank in 2022. Prior to joining HarborOne Bank, she held a number of positions at State Street Corporation, including Chief People and Administrative Officer from 2011 to 2019, Vice President, Head of Learning and Development from 2008 to 2011, and Vice President, Head of Change Management and Corporate Communications from 2003 to 2008. She also served as Chief Human Resources Officer at SIGNET Systems, Inc. from 2020 to 2022. Ms. Stewart holds a B.A. from Emmanuel College and a M.B.A. from Lesley College.

Talent Management and Engagement

The Company is an equal opportunity employer and maintains hiring practices and policies that foster and promote an engaged workforce. We strive to create an environment in which all employees feel valued and appreciated, and we are dedicated to recruiting, developing and promoting a workforce that reflects the demographics of the communities we serve and to meet the current and future demands of our business.

Our focus on engagement and belonging begins at the highest levels of the organization. Shortly after going public in 2016, the Nominating and Governance Committee began using KLR Executive Search Group, LLC to broaden its search for new directors and identify qualified candidates from a range of backgrounds. The Nominating and Governance Committee Charter has since been amended to include an explicit commitment to include in each search for new directors highly qualified candidates who reflect a variety of backgrounds and experience.

We are focused on employee representation of the markets we serve. Our commitment to employee engagement and belonging is delivered through an all-level advisory council connected to our internal and external communities. Additionally, the Company engages managers and employees through the "ONE Experience" initiative and committee.

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Community Relations and Activity

The Company recognizes its responsibility to the communities in which it operates. Social responsibility is integral to how we do business. We advance these commitments through multiple channels, including corporate donations and sponsorships, employee volunteering, non-profit board service by our employees and directors, advancing financial literacy and education through our HarborOne U program, dedication to our Community Reinvestment Act ("CRA") responsibilities, and investing in community-focused projects. Highlights of how the Company is currently fulfilling these responsibilities include:

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ROLE OF THE BOARD; CORPORATE GOVERNANCE MATTERS

Board Leadership Structure and the Role of the Board in Risk Oversight

Board Leadership Structure.The positions of our Chairman of the Board and Chief Executive Officer are separated. Separating these positions allows our Chief Executive Officer to focus on our day-to-day business, while allowing the Chairman of the Board to lead our Board in its fundamental role of providing advice to and independent oversight of management.

Our Board recognizes the time, effort and energy that the Chief Executive Officer must devote to the position in the current business environment, as well as the commitment required to serve as our Chairman, particularly as our Board's oversight responsibilities continue to grow. Our Board also believes that this structure ensures a greater role for the independent directors in the oversight of the Company and active participation of the independent directors in setting agendas and establishing priorities and procedures for the work of our Board.

Although our by-laws do not require that we separate the Chairman of the Board and Chief Executive Officer positions, our Board believes that having separate positions is the appropriate leadership structure for us at this time. Our Board recognizes that depending on the circumstances, other leadership models, such as combining the role of Chairman of the Board with the role of Chief Executive Officer, might be appropriate. Accordingly, our Board may periodically review its leadership structure. Our Board believes its administration of its risk oversight function has not affected its leadership structure.

Role of the Board in Risk Oversight.The Board is actively involved in oversight of risks that could affect the Company including credit risk, interest rate risk, liquidity risk, accounting risk, operational risk, regulatory/compliance risk, legal risk, strategic risk and reputation risk. This oversight is conducted in part through committees of the Board, but the full Board has retained responsibility for general oversight of risks. The Board satisfies this responsibility through reports by each committee regarding its considerations and actions, regular reports from officers responsible for oversight of particular risks within the Company as well as through internal and external audits. Risks relating to the direct operations of the Company are further overseen by the Board of Directors of HarborOne Bank, who are the same individuals who serve on the Board of the Company. Further, the Board oversees risks through the establishment of policies and procedures that are designed to guide daily operations in a manner consistent with applicable laws, regulations, and risks acceptable to the organization.

Director Independence

The Nasdaq listing rules requires that independent directors compose a majority of a listed company's board of directors. In addition, the Nasdaq listing rules require that, subject to specified exceptions, each member of a listed company's audit, compensation, and nominating and governance committees be independent and that audit committee members also satisfy independence criteria set forth in Rule 10A-3 under the Securities Exchange Act of 1934, as amended (the "Exchange Act"). Under Nasdaq listing rules, a director will only qualify as an "independent director" if, in the opinion of our Board, that person does not have a relationship that would interfere with the exercise of independent judgment in carrying out the responsibilities of a director. In order to be considered independent under the Exchange Act, a member of an audit committee of a listed company may not, other than in his or her capacity as a member of the audit committee, the board of directors or any other board committee: (1) accept, directly or indirectly, any consulting, advisory or other compensatory fee from the listed company or any of its subsidiaries; or (2) be an affiliated person of the listed company or any of its subsidiaries. In addition to satisfying general independence requirements under the Nasdaq listing rules, a member of a compensation committee of a listed company may not, other than in his or her capacity as a member of the compensation committee, the board of directors or any other board committee, accept, directly or indirectly, any consulting, advisory or other compensatory fee from the listed company or any of its subsidiaries. Additionally, the board of directors of the listed company must consider whether the compensation committee member is an affiliated person of the listed company or any of its subsidiaries and, if so, must determine whether such affiliation would impair the director's judgment as a member of the compensation committee.

Based upon information requested from and provided by each director concerning his or her background, employment and affiliations, including family and other relationships, including those relationships described under

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the section of this proxy statement entitled "Transactions with Related Parties," our Board determined that each of our directors, with the exception of Mr. Casey, is "independent" under the Nasdaq listing rules. Mr. Casey is not considered independent because he currently serves as our President and Chief Executive Officer. Our Board also determined that each member of the audit, compensation, and nominating and governance committees satisfies the independence standards for such committees established by the SEC and the Nasdaq listing rules, as applicable. In making these determinations on the independence of our directors, our Board considered the relationships that each such non-employee director has with our Company and all other facts and circumstances our Board deemed relevant in determining independence.

Our independent directors will meet alone in executive session periodically. The purpose of these executive sessions is to promote open and candid discussion among the independent directors.

Code of Business Conduct and Ethics

Our Board has established a Code of Business Conduct and Ethics that applies to our officers, directors and employees. Among other matters, our Code of Business Conduct and Ethics is designed to deter wrongdoing and to promote:

Any waiver of the Code of Business Conduct and Ethics for our directors or officers may be made only by our Board or a committee thereof and will be promptly disclosed as required by law or Nasdaq regulations. We intend to disclose on our website any amendment to, or waiver of, any provisions of our Code of Business Conduct and Ethics applicable to our directors and executive officers that would otherwise be required to be disclosed under the rules of the SEC or Nasdaq. A copy of our Code of Business Conduct and Ethics is available under the "Investor Relations" tab atwww.harborone.com.

Shareholder Communications with the Board

Shareholders wishing to communicate with our Board of Directors should address their communications to the Company's investor relations department by telephone at (508) 895-1000 or by mail sent to the Company's main address at 770 Oak Street, Brockton, Massachusetts 02301, Attention: Investor Relations. The mailing envelope should contain a clear notation indicating that the enclosed letter is a "Shareholder-Board Communication" or "Shareholder-Director Communication." All such letters should clearly state whether the intended recipients are all members of the Board or certain specified individual directors. All communications will be reviewed by the Company's investor relations department, which will determine whether the communication will be relayed to the Board or the director. Except for resumes, sales and marketing communications or notices regarding seminars or conferences, summaries of all shareholder communications will be provided to the Board.

The Board and its Committees

Our Board has a standing Audit Committee, Compensation Committee, Executive Committee, and Nominating and Governance Committee. The composition and responsibilities of each committee are described below. Members serve on these committees until their resignation or until otherwise determined by our Board.

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The Board held 12 meetings during fiscal year 2024, and directors attended 93% of the Board meetings and meetings of the committees on which they served during the periods they served. While we do not have a formal policy related to Board member attendance at annual meetings of shareholders, directors are encouraged to attend each annual meeting to the extent reasonably practicable. All directors attended the 2024 annual meeting of shareholders.

The table below highlights the current membership of each committee along with the number of meetings held during 2024.

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Audit Committee.The Audit Committee assists our Board in its oversight of the integrity of our financial statements, the qualifications and independence of our independent registered public accounting firm, and our internal financial and accounting controls. The Audit Committee has direct responsibility for the appointment, compensation, retention (including termination) and oversight of our independent registered public accounting firm, and our independent registered public accounting firm reports directly to the audit committee. The Audit Committee also prepares the Audit Committee report that the SEC requires to be included in our annual proxy statement.

Each member of the Audit Committee qualifies as an independent director under the corporate governance standards of the Nasdaq listing rules and the independence requirements of the Exchange Act. Our Board has determined that Ms. Santangelo qualifies as an "audit committee financial expert" as such term is currently defined under SEC rules, and that each of Ms. Santangelo and Mr. Payne qualifies as having the "banking or related financial management expertise" required by FDIC regulations. The Audit Committee has adopted a written charter that satisfies the applicable standards of the SEC and the Nasdaq listing rules, a copy of which is available under the "Investor Relations" tab atwww.harborone.com.

Compensation Committee.The Compensation Committee approves our compensation objectives, recommends to our Board for approval the compensation of the Chief Executive Officer and approves or recommends to our Board for approval the compensation of other executives. The Compensation Committee reviews all compensation components, including base salary, bonus, benefits and other perquisites. The Compensation Committee solicits the input and recommendations of management for compensation awards to other executives, including the named executive officers. Such awards are further discussed in executive session, with decisions made by the Compensation Committee without management's involvement.

Each member of the Compensation Committee is a "non-employee director" under the Exchange Act and each is an independent director as defined by the Nasdaq listing rules. The Compensation Committee also engages Pearl Meyer & Partners, LLC to provide independent executive compensation consulting services to the Compensation Committee. For further information, see the sections below entitled "-Compensation Discussion and Analysis-Role of the Compensation Peer Group in Assessing Executive Compensation" and "-Compensation Discussion and Analysis-Independent Compensation Consultant." The Compensation Committee has adopted a written charter that satisfies the applicable standards of the SEC and the Nasdaq listing rules, a copy of which is available under the "Investor Relations" tab atwww.harborone.com.

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Nominating and Governance Committee.The Nominating and Governance Committee recommends to our Board candidates for directorships and the structure and composition of our Board and the Board committees. In addition, the Nominating and Governance Committee develops and recommends to our Board corporate governance guidelines and advises our Board on corporate governance matters.

Each member of the Nominating and Governance Committee is a "non-employee director" under the Exchange Act, and each is an independent director as defined by the Nasdaq listing rules. The Nominating and Governance Committee has adopted a written charter that satisfies the applicable standards of the Nasdaq listing rules, a copy of which is available under the "Investor Relations" tab atwww.harborone.com.

Our Board of Directors may establish other committees from time to time.

Consideration of Director Nominees

The Nominating and Governance Committee is responsible for identifying, assessing and recommending the slate of candidates to be nominated for election to the Board of Directors and assesses the performance of the Board on an annual basis. The Nominating and Governance Committee uses a variety of methods for identifying and evaluating nominees for director. In the course of establishing the slate of nominees for director each year, the Nominating and Governance Committee will consider whether any vacancies on the Board are expected due to retirement or otherwise, the skills represented by retiring and continuing directors, and additional skills identified by the Board that could improve the overall quality and ability of the Board to carry out its function. In the event that vacancies are anticipated or arise, the Nominating and Governance Committee considers various potential candidates for director. Candidates may come to the attention of the Nominating and Governance Committee through the business and other networks of the existing members of the Board or from management. The Nominating and Governance Committee may also solicit recommendations for director nominees from independent search firms or any other source it deems appropriate.

The Nominating and Governance Committee requires all nominees to have experience at a strategic or policymaking level in a business, government, non-profit or academic organization of high standing; to be highly accomplished in his or her respective field, with superior credentials and recognition; to be well regarded in the community and shall have a long-term reputation for the highest ethical and moral standards; to have sufficient time and availability to devote to the affairs of the Company, particularly in light of the number of boards on which the nominee may serve; and to the extent such nominee serves or has previously served on other boards, to have a demonstrated history of actively contributing at board meetings. In addition to reviewing a nominee's background and accomplishments, nominees are reviewed in the context of the current composition of the Board of Directors and the evolving needs of the Company and whether the nominee, if elected, would assist in achieving a mix of board members that represents a variety of backgrounds and experiences.

Pursuant to the corporate governance guidelines established by the Board, a majority of the Board shall be "independent" under the Nasdaq listing standards. On an annual basis, the Nominating and Governance Committee reviews the "independent" status of each member of the Board to determine whether any relationship is inconsistent with a determination that the director was independent. Additionally, the guidelines established by the Board require that the Company's audit, compensation and nominating and governance committees shall be comprised entirely of independent directors and at least one member of the Audit Committee shall have such experience, education and other qualifications necessary to qualify as an "audit committee financial expert" as defined by SEC rules.

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Shareholder Nomination Procedure

Any shareholder of the Company entitled to vote for the election of directors at the annual meeting can submit the names of candidates for director by writing to the Corporate Secretary at HarborOne Bancorp, Inc., 770 Oak Street, Brockton, Massachusetts 02301. To be timely, a shareholder's notice must be delivered not later than the close of business on the 90^thday nor earlier than the close of business on the 120^thday prior to the first anniversary of the preceding year's annual meeting; provided, however, that in the event that the date of the annual meeting is

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advanced by more than 30 days before or delayed by more than 60 days after such anniversary date, notice by the shareholder to be timely must be so delivered not earlier than the close of business on the 120^thday prior to such annual meeting and not later than the close of business on the later of the 90^thday prior to such annual meeting or the tenth day following the day on which public announcement of the date of such meeting is first made.

The submission shall include the following information set forth below:

There were no submissions by shareholders of Board nominees for our 2025 annual meeting.

Compensation Committee Interlocks and Insider Participation

During the year ended December 31, 2024, the members of the Compensation Committee were Mandy Lee Berman, David P. Frenette, Esq., Gordon Jezard and Anne H. Margulies, each of whom are independent directors. None of our executive officers currently serves, or in the past year has served, as a member of the board of directors or compensation committee (or other committee performing equivalent functions) of any entity that has one or more executive officers serving on our Board of Directors or Compensation Committee. No member of the Compensation Committee has formerly been an officer of the Company. No interlocking relationship exists between any member of the Board of Directors or Compensation Committee (or other committee performing equivalent functions) and any executive, member of our Board of Directors or member of the compensation committee (or other committee performing equivalent functions) of any other company.

Transactions with Related Parties

The following is a description of transactions, since January 1, 2024, to which we have been a party or will be a party, in which the amount involved exceeded or will exceed $120,000, and in which any of our executive officers or directors, or an affiliate or immediate family member thereof, had or will have a direct or indirect

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material interest, other than compensation, termination and change-in-control arrangements, which are described under "-Executive Compensation" and "-Director Compensation" below.

Loans and Extensions of Credit.The Sarbanes-Oxley Act of 2002 generally prohibits loans to our executive officers and directors. However, the Sarbanes-Oxley Act contains a specific exemption from such prohibition for loans by HarborOne Bank to its executive officers and directors in compliance with federal banking regulations. Federal regulations require that all loans or extensions of credit to executive officers and directors of insured institutions must be made on substantially the same terms, including interest rates and collateral, as those prevailing at the time for comparable transactions with persons not related to HarborOne Bank and must not involve more than the normal risk of repayment or present other unfavorable features. We have adopted written policies to implement the requirements of Regulation O, which restricts the extension of credit to directors and executive officers and their family members and other related interests. Under these policies, extensions of credit that exceed regulatory thresholds must be approved by the Board of Directors. We believe that all extensions of credit to our directors and officers satisfy the foregoing conditions. As of March 31, 2025, there were two loans to our directors, executive officers and their related entities. These loans (both revolving line of credit, one with a zero balance) were performing according to their original terms.

Other Transactions.Since January 1, 2024, there have been no transactions and there are no currently proposed transactions in which we were or are to be a participant and the amount involved exceeds $120,000, and in which any of our executive officers or directors had or will have a direct or indirect material interest.

Insider Trading Policy

The Board has adopted an Insider Trading Policy and Special Trading Procedures for Insiders(the "Insider Trading Policy") governing the purchase, sale, and/or other dispositions of the Banks's securities by Directors, officers and employees, that is reasonably designed to promote compliance with insider trading laws, rules and regulations, and any listing standards applicable to the Company. A copy of the Company's Insider Trading Policy was filed as Exhibit 19.1 to the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2024 filed with the SEC on March 6, 2025.

Policy Regarding Derivatives, Short Sales, Hedging or Pledging

The Board annually reviews and approves the Company's policy with regard to insider trading. The Company's Insider Trading Policy, generally prohibits employees from pledging shares on margin, trading in derivative securities of the Company's common stock, engaging in short sales of the Company's securities, or purchasing any other financial instrument that is designed to hedge or offset any decrease in the market value of the Company's securities.

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DIRECTOR COMPENSATION

In the year ending December 31, 2024, each non-employee director received an annual cash retainer equal to $60,000. The chairman of the Board also received an additional $15,000, the Audit Committee chair received an additional $15,000, and all other committee chairs received an additional $7,500. All such retainers were paid in equal monthly installments, prorated to reflect any partial periods of service. In March 2024, our chairman received a grant of 4,181 shares of restricted stock and each other non-employee director serving at the time received a grant of 3,344 shares of restricted stock, in each case, which vest in full upon the first anniversary of the grant date.

The following table sets forth information regarding the compensation paid to our non-employee directors for the fiscal year ended December 31, 2024:

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Director Retirement Plan.Directors of HarborOne Bank as of December 31, 2016 were eligible to participate in the HarborOne Bank Director Retirement Plan, which provides for annual payments to directors who have completed six or more years of service, and who have reached the retirement age specified in the participation agreement, of a specified percentage of the total director fees paid to the director in his or her final year serving as director, as follows: 30.0% annually for five years, for directors with at least six years of service; 45.0% annually for 10 years, for directors with at least 11 years of service or 60.0% annually for 10 years, for directors with at least 21 years of service. On December 31, 2017, the Company elected to freeze the Directors' Retirement Plan and does not intend to replace it with an alternative plan at this time. The balance of the liability at December 31, 2024 was $1.9 million, and there were payouts of $139,000 in 2024.

Share Ownership Policy. Effective January 1, 2023, the Board of Directors adopted the HarborOne Bancorp, Inc. Share Ownership Policy, which applies to our Board of Directors, senior executive officers subject to Section 16 of the Exchange Act, and the President of HarborOne Mortgage. For further information, see the section below entitled "-Compensation Discussion and Analysis-Share Ownership Policy."

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COMPENSATION DISCUSSION AND ANALYSIS

Executive Summary

HarborOne Bank is a state-chartered trust company that was originally established in 1917 as a state-chartered credit union. The Bank provides a variety of financial services to individuals and businesses online and through its 30 full-service branches located in Massachusetts and Rhode Island, and commercial lending offices in each of Boston, Massachusetts and Providence, Rhode Island. The Bank also provides a range of educational services through "HarborOne U," with free digital content, webinars, and recordings for small business and personal financial education.

To foster collaboration across our business units, we engage managers and employees through the "ONE Experience" initiative, which is intended to drive more efficiency in our operations and job satisfaction as we work together to deliver an exceptional customer experience. We also remain committed to the communities that we call home in 2024, having provided nearly 5,000 hours of staff volunteer service across Massachusetts and Rhode Island and approximately $200 million in community development loans and investments to facilitate economic development in low- and moderate-income neighborhoods.

Financial Highlights

Despite a challenging interest rate environment, we continued to grow our relationship banking model focused on deposit growth, disciplined expense control and risk management to emphasize liquidity, capital strength and asset quality. We remain focused on serving our customers through our branch network and our digital channels.

For the year ended December 31, 2024, we recorded net income of $27.4 million, or $0.66 per diluted share. The retuon average assets for the year ended December 31, 2024 was 0.47%, while the retuon average equity was 4.71% for the same period. Our commitment to customer service produced loan growth of $102.2 million, or 2.2%, and customer deposit growth of $88.5 million, or 2.2%, resulting in a loan-to-deposit ratio of 106.6%. Our asset quality remained strong with a nonperforming-loans-to-total-loans ratio of 0.61%. During 2024, the Company continued to retuvalue to the shareholders, with total dividends of $0.32 per share in 2024 and a share repurchase program providing for the repurchase of $21.1 million of outstanding equity, representing 1.9 million shares.

Key Pay Decisions

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Named Executive Officers

This Compensation Discussion and Analysis provides a detailed description of our executive compensation philosophy, programs and the decisions made in 2024, and the factors considered in making those decisions. The following executives are our named executive officers.

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Compensation Philosophy and Objectives

HarborOne's executive compensation program is designed with an emphasis on rewarding for short-term goal achievement and long-term shareholder return. This alignment is created through interacting mechanisms that combine both fixed and at-risk pay-for-performance elements to:

Key Governance Elements

Highlights of our executive pay and governance practices:

What We Do

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What We Don't Do

Advisory Say on Pay Vote on Executive Compensation

At the 2024 annual meeting of shareholders, we conducted our annual say on pay vote with approximately 72.8% approval from our shareholders. The Board and Compensation Committee value the opinion of our shareholders and considered the outcome of the say on pay vote. While less than desired, the Compensation Committee discussed and reviewed investor comments and feedback received in normal discussions and implemented changes. These changes included equity vesting upon a change in control from "single trigger" to "double trigger" commencing with the March 2025 equity grants and changed the PSU operating measure so as not to overlap with the Annual Incentive Plan.

Share Ownership Policy

Our Board believes strongly in aligning the long-term interests of our directors and executives with those of our shareholders. Effective January 1, 2023, the Board of Directors adopted the HarborOne Bancorp, Inc. Share Ownership Policy, which applies to our Board of Directors, senior executive officers subject to Section 16 of the Exchange Act, and the President of HarborOne Mortgage as "Covered Individuals."

Covered Individuals must comply with the following ownership requirements (expressed as a multiple of annual cash retainer or base salary) within five years of their respective election as a director, date of hire as a senior executive officer, or date of appointment to a new role requiring them to maintain a higher level of stock ownership under the policy:

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Satisfaction of Guidelines

Covered Individuals may satisfy the ownership guidelines with common stock in the following categories ("Qualifying Shares"):

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Unearned performance shares are not considered Qualifying Shares and are not counted toward meeting the guidelines.

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Accumulation Period

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Covered Individuals are expected to accumulate the minimum number of shares to satisfy the ownership guidelines over a five-year period.

Determining Executive Compensation

The Compensation Committee evaluates multiple factors when establishing and maintaining the Company's executive compensation programs including: an annual review and selection of a relevant peer group, banking and industry surveys, financial affordability, legal and regulatory considerations to inform the total compensation for the Chief Executive Officer and senior executive officers. The Chief Executive Officer is evaluated primarily on Company performance including financial, strategic, and operational goal achievement. Named executive officers are evaluated on Company, individual performance, and future potential.

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Roles and Responsibilities in Executive Compensation

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Role of theCompensation Peer Group in Assessing Executive Compensation

The Compensation Committee works with management and engages Pearl Meyer to conduct an annual executive compensation assessment. The assessment and information are essential in the Compensation Committee's evaluation of executive compensation relative to companiesof comparable size in the banking sector.

Pearl Meyer utilizes a criteria-based selection process and guiding principles to filter broad industry information based on potential peers that are of comparable size with assets generally in the range of one-half to two times HarborOne Bank's assets, geography of banks primarily in the Northeast and adjacent states, branch network, and business model, among other criteria to recommend the proposed peer group. The two sources of competitive market compensation data used by the Compensation Committee to assess executive compensation are:

The peer group is reviewed annually for appropriateness in advance of the executive compensation pay assessment, and additions and replacements are made as appropriate.

As a result of the Peer Group assessment for 2024 compensation, the Compensation Committee approved the following peer group:

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Evaluating Executive Performance

Consistent with the annual performance management process of the Company, executive performance of the senior executive officers, including the President and Chief Executive Officer, is evaluated by the Compensation Committee in February. The President and Chief Executive Officer provides an overview to the Compensation Committee of the performance of each senior executive officer and his recommended merit increase, equity grant and short-term incentive payout. The performance analysis provides an assessment of (i) individual achievement; (ii) contribution to the Company's short and long-term performance; and (iii) the Company's values and leadership competencies.

For the President and Chief Executive Officer, the Board's Chairman gathers input from the Board and makes recommendations for the Compensation Committee's consideration relative to the President and Chief Executive Officer performance and compensation, both of which are evaluated based upon the Company's performance.

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Elements of Total Compensation

Our total executive compensation consists of four major elements: base salary, short-term incentive, long-term incentive, and benefits and perquisites. A description of each element is described below:

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The Company's compensation program reflects a mix of fixed and at-risk compensation, designed to reward senior executive officers and align their interests with those of shareholders. Each compensation element is intended to provide senior executive officers with a pay opportunity that is externally competitive and recognizes individual contributions. The following charts provide the pay mix for our named executive officers, as reflected in the Summary Compensation Table:

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Base Salaries- Base salaries are provided to recognize the experience, skills, knowledge, and responsibilities required for all our employees, including our named executive officers. Base salaries are reviewed annually, typically in connection with our annual performance review process, and adjusted from time to time to realign salaries with market levels after considering individual responsibilities, performance, and experience.

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Annual Incentive Plan -We maintain an Annual Incentive Plan to provide for short-term incentive opportunities for our executive officers that align with the Bank's annual financial and non-financial goals. Under the Annual Incentive Plan, our named executive officers are eligible for cash awards based upon the achievement of pre-established Bank performance goals.

Fiscal 2024 Target Short-Term Incentive Opportunities

Each named executive officer's target short-term incentive is reviewed annually, typically in connection with our annual performance review process, and adjusted from time to time to realign target short-term incentives with market levels after considering individual responsibilities, performance, and experience.

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Fiscal 2024 Performance Goals:

At the beginning of the fiscal year, the Compensation Committee approved the following performance goals for 2024 under the Annual Incentive Plan:

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The Annual Incentive Plan allows for adjustments in recognition of unusual or nonrecurring events affecting the Company or its subsidiaries and is designed to allow for positive or negative discretion to reflect the business environment and market conditions that may affect the Company's performance.

The Annual Incentive Plan performance range of Threshold, Target (set at the Company's budget), and Superior were set by the Compensation Committee for each of the Performance Goals. These, in turn, corresponded to a range of potential incentives that could be earned for each Performance Goal, which were also approved by the Compensation Committee. For each Performance Goal, no incentives would be earned for results below Threshold, and incentives would be capped if results met or exceeded the Superior level.The tables below set forth the ranges for each Performance Goal, the Company's 2024 actual performance on each Performance Goal, and the payout level for each Performance Goal:

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