SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

(Amendment No. ____)

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Filed by a Party other than the Registrant 

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 Definitive Proxy Statement

 Definitive Additional Materials

 Soliciting Material under §240.14a-12

Avidia Bancorp, Inc.

(Name of Registrant as Specified In Its Charter)

N/A

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check all boxes that apply):

 No fee required.

 Fee paid previously with preliminary materials.

 Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11.

August 7, 2026

Dear Fellow Stockholder:

We will hold our annual meeting of stockholders at the Marlborough Courtyard by Marriott, located at 75 Felton Street, Marlborough, MA, at 8:30 a.m., local time, on September 15, 2026. This will be our first annual meeting since we completed our initial public offering in July 2025.

The notice of annual meeting and the proxy statement appearing on the following pages describe the formal business to be transacted at the meeting.

It is important that your shares are represented at this meeting, regardless of the number of shares you own. To ensure your shares are represented, we urge you to vote promptly by completing and mailing the enclosed proxy card or by voting via the Internet or telephone. Internet and telephone voting instructions appear on the enclosed proxy card.

Sincerely,

Robert D. Cozzone

President and Chief Executive Officer

AVIDIA BANCORP, INC.

42 Main Street

Hudson, MA 01749

(800) 508-2265

NOTICE OF 2026 ANNUAL MEETING OF STOCKHOLDERS

BY ORDER OF THE BOARD OF DIRECTORS

Linda P. Marrone

Corporate Secretary

Hudson, MA

August 7, 2026

AVIDIA BANCORP, INC.

PROXY STATEMENT

FOR

2026 ANNUAL MEETING OF STOCKHOLDERS

GENERAL INFORMATION

Avidia Bancorp, Inc. is the holding company for Avidia Bank. In this proxy statement, we may also refer to Avidia Bancorp, Inc. as “Avidia Bancorp,” the “Company,” “we,” “our” or “us” and to Avidia Bank as the “Bank.”

We are providing this proxy statement to you in connection with the solicitation of proxies by our Board of Directors for use at the 2026 annual meeting of stockholders and for any adjournment or postponement of the annual meeting. We will hold the annual meeting at the Marlborough Courtyard by Marriott, located at 75 Felton Street, Marlborough, MA, on Tuesday, September 15, 2026, at 8:30 a.m., local time.

We intend to mail this proxy statement and a proxy card to stockholders of record beginning on or about August 7, 2026.

Important Notice Regarding the Availability of Proxy Materials

for the STOCKholder Meeting to Be Held on SEPTEMBER 15, 2026

This proxy statement and our Annual Report on Form 10-K, as filed with the Securities and Exchange Commission, are available at https://www.cstproxy.com/avidiabancorp/2026. The Annual Report on Form 10-K includes our audited consolidated financial statements for the fiscal year ended December 31, 2025.

INFORMATION ABOUT VOTING

Who May Vote at the Meeting

You are entitled to vote your shares of Company common stock if our records show that you held your shares as of the close of business on July 24, 2026. As of the close of business on that date, a total of 20,076,250 shares of common stock were outstanding. Each share of common stock has one vote.

Our Articles of Incorporation provide that record holders of our common stock who beneficially own, either directly or indirectly, more than 10% of our outstanding shares of common stock are not entitled to any vote with respect to the shares held in excess of the 10% limit.

Ownership of Shares

You may own your shares of Company common stock in one or more of the following ways:

If your shares are registered directly in your name, you are the holder of record of those shares, and we are sending these proxy materials directly to you. As the holder of record, you have the right to give your proxy directly to us to vote at the annual meeting or you may vote in person at the annual meeting.

If you hold your shares in street name, your broker, bank or other holder of record is sending these proxy materials to you. As the beneficial owner, you have the right to direct your broker, bank or other holder of record how to vote by completing a voting instruction form that accompanies your proxy materials. Your broker, bank or other holder of record may allow you to provide voting instructions by telephone or the Internet. Refer to the instruction form provided by your broker, bank or other holder of record that accompanies your proxy materials. If you want to vote your shares of common stock held in street name in person at the annual meeting, you must obtain a written proxy in your name from the broker, bank or other holder who is the record holder of your shares.

If you own shares of common stock indirectly through the ESOP and/or the 401(k) Plan, see “Participants in the ESOP and 401(k) Plan” below.

Attending the Meeting

Stockholders are invited to attend the annual meeting. If you hold your shares in street name through a bank, broker or other nominee, you will need proof of ownership to be admitted to the meeting. Examples of proof of ownership are a recent brokerage account statement or a letter from your bank, broker or other nominee.

Quorum and Vote Required

Quorum. We will have a quorum and be able to conduct the business of the annual meeting if a majority of the outstanding shares of Company common stock entitled to vote, represented in person or by proxy, are present at the meeting.

Votes Required for Proposals. In voting on the election of directors (Item 1), you may vote for the nominees or withhold your vote as to the nominees. There is no cumulative voting for the election of directors. Directors must be elected by a plurality of the votes cast at the annual meeting. This means that the nominees receiving the largest number of votes cast will be elected up to the maximum number of directors to be elected at the annual meeting. The maximum number of directors to be elected at the annual meeting is four.

In voting on the proposal to approve the Avidia Bancorp, Inc. 2026 Equity Incentive Plan (Item 2), you may vote for the proposal, vote against the proposal, or abstain from voting on the proposal. The affirmative vote of a majority of the votes cast on the proposal is required to approve it.

In voting on the proposal to ratify the appointment of the independent registered public accounting firm (Item 3), you may vote for the proposal, vote against the proposal, or abstain from voting on the proposal. The affirmative vote of a majority of the votes cast on the proposal is required to approve it.

Effect of Not Casting Your Vote

If you hold your shares in “street name” through a broker, bank or other nominee of record, you must instruct your broker, bank or other nominee of record on how to vote if you want your vote to count in the election of directors (Item 1) and in the vote on the approval of the Avidia Bancorp, Inc. 2026 Equity Incentive Plan (Item 2). Your broker, bank or other holder of record does not have discretion to vote your uninstructed shares with respect to these matters. Therefore, if you hold your shares in street name and you do not instruct your broker or other holder of record on how to vote on Items 1 and 2, no votes will be cast on your behalf. These are referred to as “broker non-votes.” Your broker, bank or other holder of record, however, does have discretion to vote any uninstructed shares on the ratification of the appointment of the independent registered public accounting firm (Item 3). If you are a stockholder of record and you do not cast your vote, no votes will be cast on your behalf on any of the items of business at the annual meeting.

How We Count the Votes

If you return valid proxy instructions or attend the meeting in person, we will count your shares to determine whether there is a quorum, even if you abstain from voting. Broker non-votes also will be counted to determine the existence of a quorum.

In counting votes for the election of directors, votes that are withheld and broker non-votes will have no effect on the outcome of the election.

In counting votes on the proposal to approve the Avidia Bancorp, Inc. 2026 Equity Incentive Plan, we will not count abstentions and broker non-votes as votes cast. Therefore, abstentions and broker non-votes will have no effect on the outcome of the vote on the proposal.

In counting votes on the proposal to ratify the appointment of the independent registered public accounting firm, we will not count abstentions and broker non-votes as votes cast. Therefore, abstentions and broker non-votes will have no effect on the outcome of the vote on the proposal.

Voting by Proxy

We are sending you this proxy statement to request that you allow your shares of Company common stock to be represented at the annual meeting by the designated proxies named by the Board of Directors. All shares of common stock represented at the annual meeting by properly executed and dated proxies will be voted according to the instructions indicated on the proxy card. If you sign, date and return a proxy card without giving voting instructions, your shares will be voted as recommended by our Board of Directors.

The Board of Directors unanimously recommends that you vote:

If any matters not described in this proxy statement are properly presented at the annual meeting, the persons named in the proxy card will use their own best judgment as to how to vote your shares. This would include a motion to adjourn or postpone the annual meeting to solicit additional proxies. If the

annual meeting is postponed or adjourned, your common stock may be voted by the persons named in the proxy card on the new meeting date as well, unless you have revoked your proxy. We do not know of any other matters to be presented at the annual meeting.

Instead of voting by completing and mailing a proxy card, registered stockholders can vote their shares of Company common stock via the Internet or telephone. The Internet and telephone voting procedures are designed to authenticate stockholders’ identities, allow stockholders to provide their voting instructions and confirm that their instructions have been recorded properly. Specific instructions for Internet and telephone voting appear on the enclosed proxy card. The deadline for voting via the Internet and telephone is 11:59 p.m., Eastern time, on September 14, 2026.

Revoking Your Proxy

Whether you vote by mail or via the Internet or telephone, if you are a registered stockholder, unless otherwise noted, you may later revoke your proxy by:

If you hold your shares through a bank, broker, trustee or nominee and you have instructed the bank, broker, trustee or nominee to vote your shares, you must follow the directions received from your bank, broker, trustee or nominee to change those instructions.

Participants in the ESOP and 401(k) Plan

If you participate in the ESOP, you will receive a voting instruction card that reflects all shares that you may direct the trustees to vote on your behalf under the ESOP. Under the terms of the ESOP, the ESOP trustee votes all shares held by the ESOP, but each participant in the ESOP may direct the trustee how to vote the shares of common stock allocated to his or her account. The ESOP trustee, subject to the exercise of its fiduciary duties, will vote all unallocated shares of common stock held by the ESOP and all allocated shares for which no timely voting instructions are received in the same proportion as shares for which it has received valid voting instructions.

If you participate in the 401(k) Plan, you will receive a voting instruction card that reflects all shares that you may direct the trustees to vote on your behalf under the 401(k) Plan. Under the terms of the 401(k) Plan, you may direct the 401(k) Plan trustee how to vote the shares allocated to your account. If the 401(k) Plan trustee does not receive your voting instructions, the 401(k) Plan trustee will be instructed to vote your shares in the same proportion as the voting instructions received from other 401(k) Plan participants.

The deadline for returning your voting instruction card(s) is September 8, 2026.

CORPORATE GOVERNANCE

General

The Company periodically reviews its corporate governance policies and procedures to ensure that it meets the highest standards of ethical conduct, reports results with accuracy and transparency and fully complies with the laws, rules and regulations that govern its operations. As part of this periodic corporate governance review, the Board of Directors reviews and adopts best corporate governance policies and practices for the Company.

Director Independence

Because the Company is listed on the New York Stock Exchange (the “NYSE”), we refer to the definition of “independent director” contained in the NYSE listing standards when determining the independence of our directors. All our directors are considered independent under the NYSE listing standards, except for Robert D. Cozzone because he is an employee of the Company and Avidia Bank. In determining the independence of directors, the Board of Directors has considered transactions, relationships and arrangements between the Company and its directors that are not required to be disclosed in this proxy statement under the heading “Other Information Relating to Directors and Executive Officers – Transactions with Related Persons.”

Board Leadership Structure and Board’s Role in Risk Oversight

The Board of Directors has determined that the separation of the offices of Chairman of the Board and of President and Chief Executive Officer enhances Board independence and oversight. Moreover, the separation of those offices allows the President and Chief Executive Officer to better focus on his increasing responsibilities of managing the Company, enhancing stockholder value, and expanding and strengthening the Company’s franchise while allowing the Chairman of the Board to lead the Board of Directors in its fundamental role of providing advice to and independent oversight of management. Consistent with this determination, Michael Murphy serves as Chairman of the Board and Robert D. Cozzone serves as President and Chief Executive Officer.

To further strengthen the regular oversight of the full Board of Directors, the standing committees of the Company’s Board of Directors are comprised solely of independent directors. These committees are the Audit Committee, the Compensation Committee, and the Nominating/Corporate Governance Committee. See “Committees of the Board of Directors.”

Risk is inherent with every business, and how well a business manages the risks it faces can ultimately determine its success. The Company faces several risks, including credit risk, interest rate risk, liquidity risk, operational and technology risks, compliance risk, strategic risk and reputation risk. Management is responsible for the daily management of risks the Company faces, while the Board of Directors, as a whole and through its committees, has responsibility for the oversight of risk management. In its risk oversight role, the Board of Directors has the responsibility to satisfy itself that the risk management processes designed and implemented by management are adequate and functioning as designed which is completed through its Risk Committee. Senior management also attends Board meetings and is available to address any questions or concerns raised by the Board of Directors regarding risk management and any other matters.

Committees of the Board of Directors

The following table identifies the Company’s standing committees and their members. The members of the Audit Committee, the Compensation Committee, and the Nominating/Corporate Governance Committee are considered independent according to the relevant NYSE listing standards. The charter of each committee is available in the Investor section of Avidia Bank’s website (www.avidiabank.com).

Audit Committee. The Audit Committee is established according to the requirements of the Securities Exchange Act of 1934, as amended. The Audit Committee meets periodically with the independent registered public accounting firm and management to review accounting, auditing, internal control structure and financial reporting matters. The Board of Directors has determined that M. Neil Flanigan and Michael O. Gilles each qualifies as an “audit committee financial expert” under the rules of the Securities and Exchange Commission. The report of the Audit Committee required by the rules of the Securities and Exchange Commission is included in this proxy statement. See “Report of Audit Committee.”

Compensation Committee. The Compensation Committee approves the compensation objectives for the Company and Avidia Bank, establishes the compensation for the Company’s and Avidia Bank’s senior management and conducts the performance review of the President and Chief Executive Officer. The Compensation Committee reviews all components of compensation, including salaries, cash incentive plans, long-term incentive plans and various employee benefit matters. The Committee also assists the Board of Directors in evaluating potential candidates for executive positions.

During the fiscal year ended December 31, 2025, the Compensation Committee engaged Pearl Meyer and Partners, LLC, an independent compensation consultant, to assist in developing a peer group of institutions relative to the Company and conducting a competitive assessment of the Company’s executive compensation and director compensation. The fees paid for these consulting services were approximately $53,500.

Nominating/Corporate Governance Committee. The Nominating/Corporate Governance Committee assists the Board of Directors in: (i) identifying individuals qualified to become Board members, consistent with criteria approved by the Board of Directors; (ii) recommending to the Board of Directors the director nominees for the next annual meeting; (iii) implementing policies and practices relating to corporate governance, including implementation of and monitoring adherence to corporate governance guidelines; (iv) leading the Board of Directors in its annual review of the Board’s performance; and (v) recommending director nominees for each committee. The Company’s Corporate

Governance Guidelines are available in the Investor section of Avidia Bank’s website (www.avidiabank.com).

Minimum Qualifications for Director Nominees. The Nominating/Corporate Governance Committee has adopted a set of criteria that it considers when it selects individuals to be nominated for election to the Board of Directors. A candidate must meet the eligibility requirements set forth in our Bylaws, which include a requirement that the candidate had not been subject to certain criminal or regulatory actions, a residency requirement, and an age limitation. A candidate also must meet any qualification requirements set forth in any Board of Directors or committee governing documents.

If a candidate is deemed eligible for election to the Board of Directors, the Nominating/Corporate Governance Committee will then evaluate the following criteria in selecting nominees:

The Nominating/Corporate Governance Committee will also consider any other factors it deems relevant to a candidate’s nomination that are consistent with the Company’s policies and strategic plan and the Board of Directors’ goal of promoting the Company’s long term success and providing value to stockholders.

When nominating an existing director for re-election to the Board of Directors, the Nominating/Corporate Governance Committee will consider and review an existing director’s attendance and performance at Board meetings and at meetings of committees on which he serves; length of Board service; the experience, skills and contributions that the existing director brings to the Board; and independence.

Director Nomination Process. The process that the Nominating/Corporate Governance Committee follows to identify and evaluate individuals to be nominated for election to the Board of Directors is as follows:

For purposes of identifying nominees for the Board of Directors, the Nominating/Corporate Governance Committee relies on personal contacts of the committee members and other members of the

Board of Directors, as well as its knowledge of members of the communities Avidia Bank serves. The Nominating/Corporate Governance Committee will also consider director candidates recommended by stockholders according to the policy and procedures set forth below. The Nominating/Corporate Governance Committee has not used an independent search firm to identify nominees.

In evaluating potential nominees, the Nominating/Corporate Governance Committee determines whether the candidate is eligible and qualified for service on the Board of Directors by evaluating the candidate under the criteria set forth above. If the candidate fulfills these criteria, the Nominating/Corporate Governance Committee will conduct a background check on the candidate and interview the candidate to further assess his or her qualities and the contributions he or she would make to the Board of Directors.

Consideration of Director Candidates Recommended by Stockholders. The policy of the Nominating/Corporate Governance Committee is to consider director candidates recommended by stockholders who appear to be qualified to serve on the Board of Directors. The Nominating/Corporate Governance Committee may choose not to consider an unsolicited recommendation if no vacancy exists on the Board of Directors and the Nominating/Corporate Governance Committee does not perceive a need to increase the size of the Board of Directors. To avoid the unnecessary use of the Nominating/Corporate Governance Committee’s resources, the Nominating/Corporate Governance Committee will consider only those director candidates recommended according to the procedures set forth below.

Procedures to be Followed by Stockholders. To submit a recommendation of a director candidate to the Nominating/Corporate Governance Committee, a stockholder should submit the following information in writing, addressed to the Chairman of the Nominating/Corporate Governance Committee, care of the Corporate Secretary, at our main office address:

For a director candidate to be considered for nomination at an annual meeting of stockholders, the recommendation must be received by the Nominating/Corporate Governance Committee at least 120 calendar days before the date on which the proxy statement for the previous year’s annual meeting was released to stockholders, advanced by one year.

Board and Committee Meetings

The business of the Company and Avidia Bank is conducted through meetings and activities of their respective Board of Directors and committees. During the fiscal year ended December 31, 2025, the Company’s Board of Directors held 12 meetings. No director attended fewer than 75% of the aggregate of the total number of meetings of the Board of Directors and of the meetings of the committees on which he or she served.

Board Executive Sessions

NYSE listing guidelines require the Company’s non-management directors to hold executive sessions, without management participation, at least once a year. During the fiscal year ended December 31, 2025, there was one executive session. Director Michael Murphy, Chair, presided at the executive session.

Director Attendance at Annual Meeting

This will be our first annual meeting of stockholders. The Board of Directors encourages all directors to attend the annual meeting of stockholders.

Codes of Ethics

We have adopted a Code of Ethics for Senior Officers and a Code of Ethics and Business Conduct. Both are designed to ensure that our directors and employees meet the highest standards of ethical conduct. The Code of Ethics for Senior Officers, which applies to our principal executive officer and principal financial officer, addresses conflicts of interest, the treatment of confidential information, and compliance with applicable laws, rules and regulations. The Code of Ethics and Business Conduct, which applies to all employees and directors, addresses conflicts of interest, the treatment of confidential information, general employee conduct and compliance with applicable laws, rules and regulations. In addition, both codes are designed to deter wrongdoing and promote honest and ethical conduct, the avoidance of conflicts of interest, full and accurate disclosure and compliance with all applicable laws, rules and regulations. The Code of Ethics for Senior Officers and the Code of Ethics and Business Conduct are available in the Investor section of Avidia Bank’s website (www.avidiabank.com).

Anti-Hedging Policy

We have adopted a policy that prohibits directors, officers and employees of the Company or any of its subsidiaries, and their related persons, from purchasing or selling, or offering to purchase or offering to sell, derivative securities relating to the Company’s common stock, whether or not issued by the Company, that hedge or offset, or are designed to hedge or offset, any decrease in the market value of the Company’s common stock.

Policy Regarding Insider Trading

We have adopted a policy and procedures governing the purchase, sale and/or other dispositions if the Company’s common stock by directors, officers and employees of the Company and Avidia Bank, and by the Company itself, that are reasonably designed to promote compliance with insider trading laws, rules and regulations under the federal securities laws and regulations.

Report of Audit Committee

The Company’s management is responsible for the Company’s internal control over financial reporting. The independent registered public accounting firm is responsible for performing an independent audit of the Company’s consolidated financial statements and issuing an opinion on the conformity of the consolidated financial statements with accounting principles generally accepted in the United States of America. The Audit Committee oversees the Company’s internal controls and financial reporting process on behalf of the Board of Directors.

In this context, the Audit Committee has met and held discussions with management and the independent registered public accounting firm. Management represented to the Audit Committee that the financial statements were prepared according to accounting principles generally accepted in the United States of America, and the Audit Committee has reviewed and discussed the consolidated financial statements with management and with the independent registered public accounting firm. The Audit Committee has discussed with the independent registered public accounting firm the matters required to be discussed by Public Company Accounting Oversight Board (United States) Auditing Standard No. 1301, Communications with Audit Committees, which include the quality, and not just the acceptability, of the accounting principles, the reasonableness of significant judgments and the clarity of the disclosures in the consolidated financial statements.

In addition, the Audit Committee has received the written disclosures and the letter from the independent registered public accounting firm required by the applicable requirements of the Public Company Accounting Oversight Board and has discussed with the independent registered public accounting firm the firm’s independence from the Company and its management. In concluding that the independent registered public accounting firm is independent, the Audit Committee considered, among other factors, whether the non-audit services provided by the firm were compatible with its independence.

The Audit Committee discussed with the independent registered public accounting firm the overall scope and plans for their audit. The Audit Committee meets with the independent registered public accounting firm, with and without management present, to discuss the results of their examination, their evaluation of the Company’s internal control over financial reporting and the overall quality of its financial reporting process.

In performing these functions, the Audit Committee acts only in an oversight capacity. In its oversight role, the Audit Committee relies on the work and assurances of management, which has the primary responsibility for financial statements and reports, and of the independent registered public accounting firm who, in their report, express an opinion on the conformity of the consolidated financial statements to accounting principles generally accepted in the United States of America. The Audit Committee’s oversight does not provide it with an independent basis to determine that management has maintained appropriate accounting and financial reporting principles or policies, or appropriate internal control over financial reporting designed to assure compliance with accounting standards and applicable laws and regulations. Furthermore, the Audit Committee’s considerations and discussions with management and the independent registered public accounting firm do not assure that the consolidated financial statements are presented according to accounting principles generally accepted in the United

States of America, that the audit of the consolidated financial statements has been carried out according to the standards of the Public Company Accounting Oversight Board or that the independent registered public accounting firm is in fact “independent.”

In reliance on the reviews and discussions referred to above, the Audit Committee has recommended to the Board of Directors, and the Board of Directors has approved the recommendation, that the audited consolidated financial statements be included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2025, for filing with the Securities and Exchange Commission. The Audit Committee has appointed, subject to stockholder ratification, BDMP Assurance, LLP to serve as the independent registered public accounting firm for the fiscal year ending December 31, 2026.

Audit Committee of Board of Directors

of

Avidia Bancorp, Inc.

Michael O. Gilles (Chair)

Vanessa E. Candela

M. Neil Flanigan

Carol V. Gallagher

Kennedy O. Saul

Directors’ Compensation

The following table provides the compensation received by the individuals who served as our directors during the fiscal year ended December 31, 2025. The table excludes perquisites, which did not exceed $10,000 in the aggregate for each director. Robert D. Cozzone, President and Chief Executive Officer, does not receive separate compensation for his service as a director.

________________

Director Fees. Each independent director receives an annual retainer of $50,000, except for the Chairperson of the Board who receives $90,000. Each members of the Executive Governance Committee receives an annual retainer of $10,000. Each member of sub-committee receives an annual retainer of $6,000, except for the Chairperson of a sub-committee who receives $12,000.

Supplemental Directors Retirement Plan. Avidia Bank sponsors the Avidia Bank Supplemental Directors Retirement Plan (the “Directors Retirement Plan”), in which non-employee directors participate. Avidia Bank has amended the Director Retirement Plan so that no new participants may enter

plan as of January 1, 2025. Under the Directors Retirement Plan, a director who separates from service on or after attaining age 75 will be entitled to a normal benefit equal to 70% of his or her Final Average Compensation that would be paid in 120 monthly installments. For purposes of the Directors Retirement Plan, “Final Average Compensation” means the average of the participant’s highest three years calendar years of fees paid to the participant for services as a director. A director who separates from service before attaining age 75 will receive a benefit equal to the vested portion of the normal retirement benefit. Participants vest in their benefit at the rate of 20% per year of participation in the Directors Retirement Plan, so that they are 100% vested after five years of participation. Participants also become fully vested upon their death or disability. Unless a participant elects an alternative form of payment, Avidia Bank will pay the actuarial equivalent of the retirement benefit in a lump sum within 90 days of the participant’s separation from service. If a participant dies before receiving benefits under the Directors Retirement Plan, Avidia Bank will pay the participant’s beneficiary the actuarial equivalent of the normal retirement benefit that would otherwise have been paid at age 75. The death benefit will be paid in a single lump sum within 90 days of the participant’s death.

Non-Qualified Deferred Compensation Plan. Avidia Bank maintains a nonqualified deferred compensation plan under which directors of Avidia Bank may defer up to 100% of the fees they would otherwise receive in a given plan year. As of the end of each calendar quarter, Avidia Bank credits a participant’s account under the plan with earnings or losses. A participant is always 100% vested in the participant’s account. Following a participant’s termination of service or upon death, the participant’s deferral account will be distributed to the participant in a lump sum. The plan also provides for distribution upon certain unforeseeable emergencies of the participant. Currently, only Michael O. Gilles and Joseph F. Grimaldo defer fees under the plan.

Stock Ownership

The following table provides information, as of July 24, 2026, about the beneficial owners known to the Company that own more than 5% of our outstanding common stock. A person may be considered to beneficially own any shares of common stock over which the person has, directly or indirectly, sole or shared voting or investment power.

________________

The following table provides information, as of July 24, 2026, about the shares of common stock beneficially owned by each nominee for director, by each director continuing in office, by each executive officer, and by all directors and executive officers as a group. A person may be considered to beneficially own any shares of common stock over which he has, directly or indirectly, sole or shared voting or investment power. Unless otherwise indicated, each listed individual has sole voting power and sole investment power with respect to the shares shown and none of the named individuals has pledged his or her shares. The address of each listed individual is c/o Avidia Bancorp, Inc., 42 Main Street, Hudson, MA 01749.

______________

* Less than 1%.

(1) Based on 20,076,250 shares outstanding as of the close of business on July 24, 2026.

(2) Includes 67,357 shares held in the 401(k) Plan and 1,096 shares held in the ESOP.

(3) Includes 24,500 shares held in an IRA, 13,334 shares held by an LLC and 5,000 shares held by an LLP.

(4) Includes 20,000 shares held in an IRA, 5,000 shares held by Mr. Gilles’ spouse and 1,300 shares held as custodian for his grandchild.

(5) Includes 40,000 shares held in a trust and 20,000 shares held by Mr. Grimaldo’s spouse in a trust.

(6) Includes 6,617 shares held in a trust and 18,300 shares held by Mr. Leland’s spouse's in her employer’s 401(k) plan.

(7) Includes 20,000 shares held by an LLC, 1,850 shares held by Mr. Murphy’s spouse and 7,230 shares held by Mr. Murphy’s spouse in her IRA.

(8) Includes 10,117 shares held in the 401(k) Plan and 1,096 shares held in the ESOP.

(9) Includes 17,659 shares held in the 401(k) Plan and 1,096 shares held in the ESOP.

(10) Includes 20,000 shares held in the 401(k) Plan and 1,096 shares held in the ESOP.

(11) Includes 100 shares held by an LLC and 1,096 shares held in the ESOP.

(12) Includes 22,110 shares held in the 401(k) Plan and 1,096 shares held in the ESOP.

(13) Includes 20,000 shares held in an IRA, 6,000 shares held by Mr. Murphy’s spouse, 10,440 shares held by Mr. Murphy’s spouse in her IRA and 1,096 shares held in the ESOP.

(14) Includes 22,378 shares held in the 401(k) Plan.

BUSINESS Items to be Voted on by STOCKHOLDERs

Item 1 — Election of Directors

The Company’s Board of Directors consists of 13 members. The Board of Directors is divided into three classes with three-year staggered terms, with approximately one-third of the directors elected each year. Each director of the Company also serves as a director of Avidia Bank. The Board of Directors’ nominees for election are Vanessa E. Candela, Michael R. Girard, Mark R. O’Connell and Kennedy O. Saul.

The Board of Directors intends to vote the proxies solicited by it in favor of the election of the nominees named above. If a nominee is unable to serve, the persons named in the proxy card will vote

your shares to approve the election of any substitute proposed by the Board of Directors. Alternatively, the Board of Directors may adopt a resolution to reduce the size of the Board of Directors. At this time, the Board of Directors knows of no reason why either nominee might be unable to serve.

The Board of Directors unanimously recommends that you vote “FOR” all nominees for director.

Set forth below is information regarding the Board of Directors’ nominees and the directors continuing in office. Unless otherwise stated, everyone has held his or her current occupation for the last five years. The indicated age for everyone is as of December 31, 2025. The indicated period for service as a director includes service as a director of Avidia Bank. There are no family relationships among the directors.

Director Nominees for Terms Expiring in 2029

Vanessa E. Candela has served as Chief Legal & Trust Officer of Celonis SE and its global subsidiaries since April 2021. Before Celonis, she spent three years as the Chief Legal & Compliance Officer at Nutcracker Technology Inc. Over her career she has spent more than 25 years in various roles in both private practice and in-house where she served as the executive responsible for legal, compliance, information security, IT, business systems and/or ESG. Her extensive experience provides the board of directors with valuable knowledge across multiple disciplines related to Avidia Bank’s business. Age 52. Director since 2023.

Michael R. Girard is a Doctor of Chiropractic. He has been the owner and proprietor of Hudson Family Chiropractic since 1987. He has served on and with various civic, business, cultural and professional boards and organizations over his 38-year professional career. He provides the board of directors with invaluable management experience and community networking connections. Age 65. Director since 2001.

Mark R. O’Connell is retired. He had served as President and Chief Executive Officer of Assabet Valley Bancorp and Avidia Bank for 21 years until retiring in May 2023. His broad banking experience and institutional knowledge of Avidia Bank and our market areas provides invaluable insight to Avidia Bank’s business. Age 65. Director since 2004.

Kennedy O. Saul is a seasoned Technology & Consulting Executive, currently serving as North American OEM Channel Leader at NVIDIA (AI Company). He was previously a Market Development Director at Accenture (January 2021 to January 2025), as well as holding other executive and consulting positions with leading companies, including Ernst & Young (March 2019 to January 2021), Virtustream, Dell Technologies, SAP, Computer Sciences Corporation, KPMG, and Siemens Nixdorf Information Systems. Through his extensive experience in technology and business consulting in various business sectors, including technology and financial services, he provides the board of directors with valuable insight in these areas. Age 58. Director since 2023.

Directors Continuing in Office with Terms Expiring in 2027

James N. Ball is a self-employed financial advisor managing approximately $1.0 billion of assets for high net worth individuals. He has forty years of experience in the wealth management business and has owned his own financial advisory firm, EverRise, Inc. (formerly named James N. Ball & Co., Inc.), since 1984. He is a Financial Institution Regulatory Authority-registered representative of Commonwealth Financial Network, an independent broker-dealer. He has served on multiple boards and committees for the Town of Westborough, including the planning board, economic development committee, capital

expenditures committee, community preservation committee, and library foundation. His extensive experience in investments, estate planning, risk management, tax planning, land use, and business planning provides the board of directors with valuable knowledge in connection with Avidia Bank’s business. Age 63. Director since 2003.

M. Neil Flanigan, a certified public accountant, is principal in the accounting firm of Flanigan, Cotillo & Mainzer, LLP, with whom he has been employed since 1990. With 40 years of experience in finance and accounting, he provides the board of directors with valuable knowledge of the financial aspects of Avidia Bank’s business. Age 65. Director since 2000.

Carol V. Gallagher is an attorney-at-law. She has more than 30 years of experience practicing law in the private sector and the public sector. She has been employed with the Massachusetts Trial Court since 2019. She serves as Vice Chair of the Planning Board of the City of Leominster, as a director of the Vanessa T. Marcotte Foundation, a 501(c)(3) charitable organization, and as a member of the Fitchburg State University Supporting Organization. Her expansive legal background provides the board of directors with valuable information on all aspects of Avidia Bank’s business. Age 60. Director since

2020.

Michael Murphy is the President of Murphy Group LLC, an insurance broker, since 1995. He provides the board of directors with invaluable risk management and financial experience. Age 59. Director since 2013.

Directors Continuing in Office with Terms Expiring in 2028

Paul Blazar, now retired, served as Administrator and Chief Financial Officer of the Town of Hudson for 26 years until retiring in 2013. His extensive experience in financial management provides the board of directors with valuable knowledge in connection with Avidia Bank’s business. Age 74. Director since 2000.

Robert D. Cozzone has served as President and Chief Executive Officer of Assabet Valley Bancorp and Avidia Bank since March 2023. He has been employed in banking his entire professional career. From April 2019 to March 2023, he served as Executive Vice President and Chief Operating Officer of Independent Bank Corp. and its bank subsidiary, Rockland Trust Company, where his responsibilities included mergers and acquisitions strategy, consumer banking, and investor relations, among others. Before that he served as Chief Financial Officer from 2013 to 2019. He holds undergraduate and graduate degrees in management and finance. His extensive senior management experience in community banking provides the board of directors with valuable knowledge of Avidia Bank’s business. Age 54. Director since 2023.

Joseph F. Grimaldo is a certified public accountant and has over 45 years of experience in public accounting. He is a former partner of, but continues to be affiliated with, the accounting, tax and consulting firm of O’Connor Maloney and Company, P.C. since 1982. He provides the board of directors with invaluable financial and accounting experience. Age 68. Director since 2001.

Michael O. Gilles is a seasoned financial services executive who brings over 45 years of community banking experience to Avidia. Before starting a bank consultancy practice in 2024, he served as the Executive Vice President, Chief Operating and Financial Officer of Cambridge Financial Group, Inc, the holding company for Cambridge Savings Bank in Cambridge, MA. His professional background includes executive positions at several Massachusetts mutual and public banks. He possesses extensive knowledge of all areas of banking and has specific expertise in financial management and reporting, internal controls, asset/liability and investment portfolio management, mergers and acquisitions, credit

administration and risk management. Mr. Gilles is a native of Hudson, MA, where Avidia Bank is headquartered. Mr. Gilles is a Certified Management Accountant and earned a bachelor’s degree in accountancy from Bentley University. He is also a graduate of the Stonier Graduate School of Banking. Age 66. Director since 2025.

Jeffrey B. Leland is an attorney-at-law. He has practiced since 1991 and is the owner of Leland Law Associates, PC and J.B. Leland Law, LLC. With an L.L.M. in Estate Planning and Elder Law, he also does conveyance law and tax planning. He is a licensed real estate broker, principal owner of South Street, Inc., which owns and manages real estate, and stockholder of Leland Insurance Agency, Inc., a property and casualty insurance agency. He has served on multiple boards and committees in the Town of Northborough including the Community Preservation Committee, Zoning Board of Appeals, and is on the board of directors of a Massachusetts non-profit organization for aging and caregiving. He provides the board of directors with invaluable legal, property ownership and management experience. Age 61.

Director since 2009.

Executive Officers Who Do Not Serve as Directors

Set forth below is information regarding our executive officers who do not serve as directors of the Company. Each individual has held his current position for at least the last five years, unless otherwise stated. The age presented is as of December 31, 2025.

Jonathan Nelson has served as Executive Vice President and Chief Financial Officer since October 2024. He has more than 25 years in banking and before joining Avidia Bank he was employed at Independent Bank Corp. and its bank subsidiary, Rockland Trust Company, since 2007. At Rockland Trust Company he served as the Treasurer since 2015 where his responsibilities included interest rate risk management, liquidity management, capital planning, mergers and acquisitions, shareholder relations, investments, derivatives, and strategic planning. Age 45.

Bartholomew H. Murphy, Jr. has been employed with Avidia Bank since January 1992. He has served as Executive Vice President and Chief Operating Officer since 2021. From 1992 to 2010 he served in various lending and commercial banking management positions. From 2010 to 2021 he served as Executive Vice President and Chief Lending Officer. Age 61.

Robert W. Conery has been employed with Avidia Bank for 35 years. In November 2000 he was appointed Executive Vice President and Chief Operations Officer and his responsibilities include overseeing Operational Support and Information Technology. He holds undergraduate and graduate degrees in management and finance as well as other professional certifications. Age 62.

Barry H. Jensen has served as Executive Vice President and Chief Administrative Officer since May 2024. From October 2023 to April 2024 he was affiliated with BHJ Advisory Services LLC, a banking consulting firm. Before then he was employed by Rockland Trust Company from October 1998 to August 2023, serving in roles such as Controller and Principal Accounting Officer, and most recently as Executive Vice President and Chief Technology and Operations Officer. Age 60.

Nicolas Karmelek has served as Executive Vice President and Chief Risk Officer since October 2018. Before joining Avidia Bank, he served for 13 years with the Federal Reserve Bank of Boston, including as a bank examiner and a member of its large bank supervisory group. He holds undergraduate and graduate degrees in management and finance/accounting. He is a CFA Institute Charterholder and a Certified Enterprise Risk Professional (CERP). Age 42.

Donald J. Frost III has been employed with Avidia Bank since May 2011. He has served as Executive Vice President – Consumer Banking since January 2021. He holds an undergraduate degree in accounting. Age 54.

Thomas Doane has served as Director of Human Resources at Avidia Bank since 2010 and was promoted to Executive Vice President in 2023. He holds a Bachelor’s degree and a Masters of Business Administration. Age 53.

Item 2 — Approval of Avidia Bancorp, Inc. 2026 Equity Incentive Plan

Overview

Avidia Bancorp’s Board of Directors has unanimously approved, and unanimously recommends that stockholders approve, the Avidia Bancorp, Inc. 2026 Equity Incentive Plan (the “2026 Equity Plan” or the “Plan”). The full text of the 2026 Equity Plan is attached as Appendix A to this proxy statement, and the description of the Plan in this proxy statement is qualified in its entirety by reference to it.

The 2026 Equity Plan will become effective on September 15, 2026 (the “Plan Effective Date”) if stockholders approve the Plan on that date. No awards have been made under the 2026 Equity Plan. However, initial awards to our non-employee directors are set forth in the Plan document and will self-execute on the day following the approval of the Plan by stockholders.

No awards may be granted under the 2026 Equity Plan after the day immediately before the tenth anniversary of the Plan Effective Date. However, awards outstanding under the 2026 Equity Plan at that time will continue to be governed by the 2026 Equity Plan and the award agreements under which they were granted.

Best Practices

The 2026 Equity Plan reflects the following equity compensation plan best practices:

Why Avidia Bancorp Believes You Should Vote to Approve the 2026 Equity Plan

Our Board of Directors believes that equity-based incentive awards will play a key role in the success of Avidia Bancorp by encouraging and enabling employees, officers and non-employee directors of Avidia Bancorp and Avidia Bank, upon whose judgment, initiative and efforts Avidia Bancorp has depended and continues to largely depend for the successful conduct of its business, to acquire an ownership stake in Avidia Bancorp, thereby stimulating their efforts on behalf of Avidia Bancorp and strengthening their desire to remain with Avidia Bancorp. The details of the key design elements of the 2026 Equity Plan are set forth in the section entitled “Plan Summary,” below.

We view the ability to use Avidia Bancorp common stock as part of our compensation program as an important component to our future success because we believe it will enhance a pay-for-performance culture that is an important element of our overall compensation philosophy. Equity-based compensation will further align the compensation interests of our employees and directors with the investment interests of our stockholders as it promotes a focus on long-term value creation through time-based and/or performance-based vesting criteria.

If the 2026 Equity Plan is not approved by stockholders, Avidia Bancorp will have to rely on the cash component of its employee compensation program to attract new employees and to retain our existing employees, which may not align our employees’ interests with the investment interests of Avidia Bancorp’s stockholders. In addition, if the 2026 Equity Plan is not approved by stockholders and Avidia Bancorp is not able to use stock-based awards to recruit and compensate its directors, officers and other key employees, it could be at a competitive disadvantage for key talent, which could impede our future

growth plans and other strategic priorities. The inability to provide equity-based awards would likely increase cash compensation expense over time and use up cash that might be better utilized if reinvested in Avidia Bancorp’s business or returned to Avidia Bancorp’s stockholders.

Equity Awards Will Enable Us to Better Compete for Talent in Our Marketplace. Most of our competitors offer equity-based compensation to their employees and non-employee directors. We view the ability to offer equity-based compensation as important to our ability to compete for talent within our highly competitive talent marketplace. If the 2026 Equity Plan is not approved, we will be at a significant disadvantage as compared to our competitors to attract and retain our executives as well as directors and, as noted above, this could impede our ability to achieve our growth plans and other strategic priorities.

Equity Based Incentive Plans are Routinely Adopted by Financial Institutions Following Conversions. A substantial majority of financial institutions that complete a mutual-to-stock conversion have adopted equity-based compensation plans to attract, retain and reward qualified personnel and management.

Our Share Reserve is Generally Consistent with Banking Regulations and Industry Standards Disclosed in Connection with our Stock Offering. The number of restricted stock awards (including RSUs) and stock options that we may grant under the 2026 Equity Plan, measured as a percentage of sum of the number of shares sold in the conversion stock offering and contributed to the charitable foundation established in connection with the mutual-to-stock conversion of the former Assabet Valley Bancorp, is consistent with that which was disclosed in connection with our stock offering in the offering prospectus. The share reserve under the 2026 Equity Plan represents 14% of the aggregate 20,076,625 shares of Avidia Bancorp common stock sold in the conversion stock offering and contributed to the charitable foundation, of which a number equal to 4% of such shares (the “4% Limit”) will be available to grant as awards of restricted stock and/or RSUs and a number equal to 10% of such shares (the “10% Limit”) is comprised of stock options. This share reserve size, including the limits on award types described above, is also consistent with the amounts permitted under federal banking regulations for equity plans adopted within the first year following a mutual-to-stock conversion. Although we are not bound by these regulatory limits because we are implementing our equity plan more than one year following the completion of the mutual-to-stock conversion of Assabet Valley Bancorp, Avidia Bank’s former mutual holding company, we have generally determined to maintain the size of the share reserve at that limit, subject to the following important exception.

Determination of Shares Available under the 2026 Equity Plan

Avidia Bancorp is requesting approval of a pool of shares of its common stock (referred to in this proxy statement as the “share reserve”) for awards under the 2026 Equity Plan, subject to adjustment as described in the 2026 Equity Plan. The shares of common stock to be issued by Avidia Bancorp under the 2026 Equity Plan will be currently authorized but unissued shares or shares that Avidia Bancorp may subsequently acquire, including shares that may be purchased on the open market or in private

transactions.

In determining the size of the share reserve under the 2026 Equity Plan, Avidia Bancorp considered a number of factors, including: (i) industry practices related to the adoption of equity-based incentive plans by recently converted institutions; (ii) applicable banking regulations related to the adoption of equity-based incentive plans; and (iii) guidelines issued by proxy advisory firms with respect to equity incentive plans, including the potential cost and dilution to stockholders associated with the share reserve.

Avidia Bancorp disclosed to stockholders in its prospectus for its conversion stock offering in connection with the mutual-to-stock conversion of Assabet Valley Bancorp that it expected to adopt an equity incentive plan that, if adopted within the first year following the mutual-to-stock conversion, would include restricted stock awards and stock options equal to the 4% Limit and 10% Limit, respectively. Based on these percentages and the 20,076,250 aggregate shares sold in the stock offering and contributed to the charitable foundation, the total amount of shares available for issuance under the 2026 Equity Plan is 2,810,675. As noted, this is the same number of shares we would be permitted to issue under applicable conversion regulations if the 2026 Equity Plan had been implemented within the one-year period following Assabet Valley Bancorp’s mutual-to-stock conversion. Even though we are implementing the 2026 Equity Plan more than one year after our offering, we have determined to maintain the size of the 2026 Equity Plan at the amount disclosed in our offering prospectus.

Application of Share Reserve. Avidia Bancorp has determined that of the shares available under the Plan, 803,050 shares may be issued as restricted stock or restricted stock units, including performance shares and performance share units (representing the 4% Limit described above) and 2,007,625 shares may be issued upon the exercise of stock options (representing the 10% Limit described above).

Current Stock Price. The closing price of Avidia Bancorp common stock on July 27, 2026 (the latest practicable date before the printing of this proxy statement), was $21.65 per share, as reported by the NYSE.

Plan Summary

The following summary of the material terms of the 2026 Equity Plan is qualified in its entirety by reference to the full text of the 2026 Equity Plan, which is attached as Appendix A to this proxy statement.

Purpose of the 2026 Equity Plan. The purpose of the 2026 Equity Plan is to promote the long-term financial success of Avidia Bancorp and Avidia Bank by providing a means to attract, retain and reward individuals who contribute to that success and to further align their interests with those of Avidia Bancorp stockholders through the ownership of shares of common stock of Avidia Bancorp and/or through compensation tied to the value of Avidia Bancorp’s common stock.

Administration of the 2026 Equity Plan. The 2026 Equity Plan will be administered by the Compensation Committee consisting of at least two “Independent Board Members” which includes directors who, with respect to Avidia Bancorp or any subsidiary: (i) are not current employees; (ii) are not former employees who continue to receive compensation (other than through a tax-qualified plan); (iii) are not officers at any time in the past three years; (iv) do not receive compensation for which disclosure would be required pursuant to Item 404 of Regulation S-K of the proxy solicitation rules of the Securities and Exchange Commission; and (v) do not possess an interest in any other transaction and or engaged in a business relationship for which disclosure would be required under Item 404(a) of Regulation S-K. To the extent permitted by law, the Compensation Committee may also delegate its authority, including its authority to grant awards, to one or more persons who are not members of Avidia Bancorp’s Board of Directors, except that no such delegation will be permitted with respect to awards to officers who are subject to Section 16 of the Exchange Act. The Compensation Committee’s authority includes determining individuals who will receive awards and the time they will receive awards, determining the types and number of awards, establishing the terms, conditions, features, performance criteria, restrictions and other provisions of awards. The Compensation Committee may also cancel or suspend awards and reduce, eliminate or accelerate any restrictions applicable to an award at any time after the grant of the award, or extend the period to exercise a stock option, provided that the extension is consistent with Code Section 409A. Notwithstanding the foregoing, the Compensation Committee will not have the authority or

discretion to accelerate the vesting requirements applicable to an Award to avoid the one-year minimum vesting requirement contained in the 2026 Equity Plan, except in the event of a change in control and in the event of termination due to death or disability.

Eligible Participants. Employees, service providers and non-employee members of the Boards of Directors of Avidia Bancorp and Avidia Bank and their subsidiaries will be eligible for selection by the Compensation Committee for the grant of awards under the 2026 Equity Plan. As of July 27, 2026 (the latest practicable date before the printing of this proxy statement), approximately 245 employees of Avidia Bancorp and Avidia Bank and its subsidiaries and 12 non-employee members of Avidia Bancorp’s Board of Directors would be eligible for awards under the 2026 Equity Plan. The number of service providers eligible for selection by the Compensation Committee for the grant of awards under the 2026 Equity Plan is currently indeterminable.

Types of Awards. The 2026 Equity Plan provides for the grant of restricted stock, RSUs, non-qualified stock options (“NQSOs”), and incentive stock options (“ISOs”), any or all of which can be granted with performance-based vesting conditions. ISOs may be granted only to employees of Avidia Bancorp and its subsidiaries and affiliates.

Restricted Stock and Restricted Stock Units. A restricted stock award is a grant of common stock to a participant for no consideration, or such minimum consideration as may be required by applicable law. Restricted stock awards under the 2026 Equity Plan will be granted only in whole shares of common stock and will be subject to vesting conditions and other restrictions established by the Compensation Committee consistent with the 2026 Equity Plan. Before awards vest, unless otherwise determined by the Compensation Committee, the recipient of a restricted stock award may exercise voting rights with respect to the common stock subject to the award. Cash dividends declared on unvested restricted stock awards will be withheld by Avidia Bancorp and distributed to a participant at the same time that the underlying restricted stock vests to the participant. Stock dividends on shares of restricted stock will be subject to the same vesting conditions as those applicable to the restricted stock on which the dividends were paid.

Restricted stock units are similar to restricted stock awards in that the value of an RSU is denominated in shares of common stock. However, unlike a restricted stock award, no shares of stock are transferred to the participant until certain requirements or conditions associated with the award are satisfied. A participant who receives an RSU award will not possess voting rights but may accrue dividend equivalent rights to the extent provided in the award agreement evidencing the award. If dividend equivalent rights are granted with respect to an RSU award, the dividend equivalent rights will be withheld by Avidia Bancorp and will not be distributed before the underlying RSU settles. At settlement, restricted stock units can be settled in Avidia Bancorp common stock or in cash, at the discretion of the Compensation Committee. The same limitation on the number of shares that are available to be granted as restricted stock awards available under the 2026 Equity Plan, referred to above as the 4% Limit, also applies to RSUs.

The Compensation Committee will specify the terms applicable to a restricted stock award or an RSU award in the award agreement including the number of shares of restricted stock or number of RSUs, as well as any restrictions applicable to the restricted stock or RSU such as continued service or achievement of performance goals, the length of the restriction period and the circumstances under which the vesting of such award will accelerate.

Stock Options. A stock option gives the recipient the right to purchase shares of common stock at a specified price (the “exercise price”) for a specified period of time. The exercise price may not be less than the fair market value of the common stock on the date of grant. “Fair Market Value” for purposes of the

2026 Equity Plan means, if the common stock of Avidia Bancorp is listed on a securities exchange, national market system or automated quotation system, the closing sales price of the common stock on that date, or, if the common stock was not traded on that date, then the closing price of the common stock on the immediately preceding trading date. If the common stock is not traded on a securities exchange, national market system or automated quotation system, the Compensation Committee will determine the Fair Market Value in good faith and on the basis of objective criteria consistent with the requirements of the Code. Under the Plan, no stock option can be exercised more than 10 years after the date of grant and the exercise price of a stock option must be at least equal to the fair market value of a share on the date of grant of the option. However, with respect to an ISO granted to an employee who is a shareholder holding more than 10% of Avidia Bancorp’s total voting stock, the ISO cannot be exercisable more than five years after the date of grant and the exercise price must be at least equal to 110% of the fair market value of a share on the date of grant. Stock option awards will be subject to vesting conditions and restrictions as determined by the Compensation Committee and set forth in the applicable award agreement.

Grants of stock options under the 2026 Equity Plan will be either ISOs or NQSOs. ISOs have certain tax advantages and must comply with the requirements of Code Section 422. Only employees will be eligible to receive ISOs. One requirement to receive favorable tax treatment available to ISOs under the Code is that the 2026 Equity Plan must specify, and Avidia Bancorp stockholders must approve, the number of shares available to be issued as ISOs. As a result, to provide flexibility to the Compensation Committee, the 2026 Equity Plan provides that all the stock options may be issued as ISOs. ISOs cannot be granted under the 2026 Equity Plan after June 24, 2036. Dividend equivalents rights will not be paid with respect to awards of stock options.

Shares of common stock purchased upon the exercise of a stock option must be paid for in full at the time of exercise: (1) either in cash or with stock valued at fair market value as of the day of exercise; (2) by a “cashless exercise” through a third party; (3) by a net settlement of the stock option using a portion of the shares obtained on exercise in payment of the exercise price; (4) by personal, certified or cashiers’ check; (5) by other property deemed acceptable by the Compensation Committee; or (6) by a combination of the foregoing.

Performance Awards. The Compensation Committee will specify the terms of any performance awards issued under the 2026 Equity Plan in the accompanying award agreements. Any award granted under the plan, including stock options, restricted stock (a “performance share”) and restricted stock units (a “performance share unit”) may be granted subject to the satisfaction of performance conditions determined by the Compensation Committee. A performance share or performance share unit will have an initial value equal to the fair market value of a share on the date of grant. In addition to any non-performance terms applicable to the performance share or performance share unit, the Compensation Committee will set one or more performance goals which, depending on the extent to which they are met, will generally determine the number of performance shares or performance share units that will vest in the participant (unless subject to further time-based vesting conditions). The Compensation Committee may provide for payment of earned performance share units in cash, shares of Avidia Bancorp’s common stock, or a combination thereof. The Compensation Committee will also specify any restrictions applicable to the performance share or performance share unit award such as continued service, the length of the restriction period (subject to the one-year minimum described above) and whether any circumstances, such as death, disability, or involuntary termination in connection with or following a change in control, shorten or terminate the restriction period.

Performance Measures. A performance objective may be described in terms of company-wide objectives or objectives that are related to a specific subsidiary or business unit of Avidia Bancorp, and may be measured relative to a peer group, an index or business plan and based on absolute measures or changes in measures. An award may provide that partial achievement of performance measures results in

partial payment or vesting of an award. Achievement of the performance measures may be measured over more than one period or fiscal year. In establishing performance measures applicable to a performance-based award, the Compensation Committee may provide for the exclusion of the effects of certain items, including but not limited to: (i) extraordinary, unusual, and/or nonrecurring items of gain or loss; (ii) gains or losses on the disposition of a business; (iii) dividends declared on Avidia Bancorp’s stock; (iv) changes in tax or accounting principles, regulations or laws; or (v) expenses incurred in connection with a merger, branch acquisition or similar transaction. Moreover, if the Compensation Committee determines that a change in the business, operations, corporate structure or capital structure of Avidia Bancorp or the manner in which Avidia Bancorp or its subsidiaries conducts its business or other events or circumstances render current performance measures to be unsuitable, the Compensation Committee may modify the performance measures, in whole or in part, as it deems appropriate.

The Compensation Committee will specify the period over which the performance goals for a particular award will be measured and will determine whether the applicable performance goals have been met with respect to a particular award following the end of the applicable performance period. Notwithstanding anything to the contrary in the Plan, performance measures relating to any award granted under the Plan will be modified, to the extent applicable, to reflect a change in the outstanding shares of stock of Avidia Bancorp by reason of any stock dividend or stock split, or a corporate transaction, such as a merger of Avidia Bancorp into another corporation, any separation of a corporation or any partial or complete liquidation by Avidia Bancorp or a subsidiary.

Individual Limits. The Board of Directors has chosen to adopt the overall limitations set forth in federal regulations for individual and aggregate awards to employees and non-employee directors under equity plans adopted within the first year after a mutual-to-stock conversion. The Compensation Committee will determine the individuals to whom awards will be granted, the number of shares subject to an award, and the other terms and conditions of an award, subject to the limits set forth herein. Subject to adjustment as described in the 2026 Equity Plan:

Non-Employee Director Grants. Subject to approval of the 2026 Equity Plan, each non-employee director of Avidia Bancorp will receive a grant of shares of restricted stock and stock options as set forth

in the tables below. If the 2026 Equity Plan is approved, these grants will be self-executing and will be deemed to be granted on the day following the approval of the 2026 Equity Plan by Avidia Bancorp’s stockholders.

____________________

_______________________

(1) The actual value of the stock option awards is not determinable because their value will depend upon the fair market value of Avidia Bancorp common stock on the date the stock option is exercised.

The Compensation Committee determined to grant these one-time awards in this amount, in part, in recognition of the significant efforts and dedication of each such director, including in connection with the mutual-to-stock conversion of Assabet Valley Bancorp, the former mutual holding company of Avidia Bank. Although the grants are, in part, in recognition of past service, the initial awards to directors will vest in equal annual installments over a period of five years from the date of grant, subject to the directors continued service to Avidia Bancorp during that time, and subject to acceleration due to death, disability, involuntary termination of service in connection with a change in control. Pending vesting, voting rights may be exercised with respect to the shares of Common Stock subject to the restricted stock awards, and cash dividends declared on unvested restricted stock awards will be held by Avidia Bancorp and distributed to the recipient at the same time that the underlying restricted stock vests. Options may be exercised over the ten-year period following the date of grant, and the exercise price for the option awards will be the

closing sales price of Avidia Bancorp’s common stock as quoted on the NYSE as of the grant date, which will be the day after stockholder approval.

Employee Grants. At the present time, no specific determination has been made as to the grant or allocation of awards to officers and employees. However, the Compensation Committee intends to grant equity awards to senior executives and will meet promptly after stockholder approval is received to determine the specific terms of the awards, including the allocation of awards to officers and employees.

Certain Restrictions with Respect to Awards. No dividend equivalent rights will be granted or paid with respect to any stock option. Additionally, no dividends or dividend equivalent rights will be paid on unvested restricted stock or RSU awards contemporaneously with dividends paid on shares of Avidia Bancorp’s common stock. Instead, any dividends (or dividend equivalent rights, to the extent granted), with respect to an unvested restricted stock or RSU award will be accumulated (or deemed reinvested, as to an RSU award) until such time as the underlying award becomes vested (including, where applicable, upon the achievement of performance goals).

The Compensation Committee will establish the vesting schedule or market or performance conditions of each award at the time of grant. However, at least 95% of the awards will vest no earlier than one year after the date of grant, unless accelerated due to death, disability or an involuntary termination of service at or following a change in control.

Adjustments. The Compensation Committee will make equitable adjustments in the number and class of securities available for issuance under the 2026 Equity Plan (including under any awards then outstanding), the number and type of securities subject to the individual limits set forth in the 2026 Equity Plan, and the terms of any outstanding award, as it determines are necessary and appropriate, to reflect any merger, reorganization, consolidation, recapitalization, reclassification, stock split, reverse stock split, spin-off combination, exchange of shares, distribution to stockholders (other than an ordinary cash dividend), or similar corporate transaction or event.

Termination of Service. Subject to certain exceptions, generally, if a participant ceases to perform services for Avidia and its subsidiaries for any reason: (i) a participant will immediately forfeit any restricted stock, RSUs, performance shares and performance share units that were not vested on the date of termination; (ii) all of the participant’s stock options that were exercisable on the date of termination will remain exercisable for, and shall otherwise terminate at the end of, a period of 90 days after the date of termination, but in no event after the expiration date of the stock options; and (iii) all of the participant’s stock options that were not exercisable on the date of termination will be forfeited immediately upon termination. In the event of a participant’s termination of service due to death,disability (as defined in the plan), retirement after age 65, or involuntary termination at or following a change in control, the participant or the participant’s beneficiary, as applicable, has up to one year to exercise outstanding stock options, provided that the period does not exceed the stock option award’s original term. Unless the Compensation Committee specifies otherwise in the award agreement, the 2026 Equity Plan provides that a participant shall vest in his or her dividends upon termination of the participant’s service due to death, disability, involuntary termination without cause or resignation for “good reason” (as defined in the 2026 Equity Plan) at or following a change in control.

Change in Control. Unless the Compensation Committee provides otherwise in the award agreement, any time-based vesting requirement applicable to an award will be deemed satisfied in full if (i) both a change in control occurs and a participant has an involuntary termination of service (including a resignation for good reason) with Avidia Bancorp or (ii) the surviving entity in the change in control does not assume or replace the award with a comparable award issued by the surviving entity. With respect to an award that is subject to one or more performance objectives, unless the Compensation Committee

specifies otherwise in the award agreement, in the event of a change in control and involuntary termination of service (including a resignation for good reason) or if the surviving entity fails to assume or replace the award with a comparable award issued by the surviving entity, achievement of the performance objective will be deemed achieved at the greater of target or the actual level of performance measured as of the most recent completed fiscal quarter.

Transferability. Generally, awards granted under the 2026 Equity Plan are not transferable before death, except in limited circumstances with respect to stock options. Unless otherwise determined by the Compensation Committee, stock options, including ISOs, are transferable to certain grantor trusts established by the participant in which the participant is the sole beneficiary or between spouses’ incident to divorce. However, in the latter case, any ISOs so transferred will become NQSOs. In the Compensation Committee’s sole discretion, an individual may transfer non-qualified stock options to certain family members or to a trust or partnership established for the benefit of such family member or to a charitable organization, in each case, provided no consideration is paid to the participant in connection with the transfer. However, a participant may designate a beneficiary to exercise stock options or receive any rights that may exist upon the participant’s death with respect to awards granted under the 2026 Equity Plan. Any transferee is subject to the terms and conditions of the Plan and applicable award agreement.

Amendment and Termination. The Board of Directors may at any time amend or terminate the 2026 Equity Plan, and the Board of Directors or the Compensation Committee may amend any award agreement for any lawful purpose, but no such action may materially adversely affect any rights or obligations with respect to any awards previously granted under the 2026 Equity Plan, except to the extent described herein. The Board of Directors or Compensation Committee may amend the 2026 Equity Plan or an outstanding award agreement to conform the plan or award agreement to applicable law (including but not limited to Code Section 409A) or to avoid an accounting treatment resulting from an accounting pronouncement or interpretation issued by the SEC or Financial Accounting Standards Board after adoption of the plan or the grant of the award, which may materially and adversely affect the financial condition or operations of Avidia Bancorp. Neither the Board of Directors nor the Compensation Committee can reprice a stock option without prior stockholder approval, except according to the adjustment provisions of the 2026 Equity Plan (as described above). Notwithstanding the foregoing, any amendment that would materially (i) increase the benefits available under the Plan, (ii) increase the aggregate number of securities under the Plan, or (iii) materially modify the requirements for participation in the Plan must be approved by Avidia Bancorp’s stockholders.

Certain Federal Income Tax Consequences

The following is intended only as a summary of the federal income tax rules relevant to the primary types of awards available for issuance under the 2026 Equity Plan and is based on the terms of the Code as currently in effect. The applicable statutory provisions are subject to change in the future (possibly with retroactive effect), as are their interpretations and applications. Because federal income tax consequences may vary based on individual circumstances, participants are encouraged to consult their personal tax advisors with respect to their tax consequences. The following summary is limited only to United States federal income tax treatment. It does not address state, local, gift, estate, social security or foreign tax consequences, which may be substantially different.

Restricted Stock Awards. A participant generally will recognize taxable ordinary income upon the receipt of shares as a restricted stock award if the shares are not subject to a “substantial risk of forfeiture,” which is generally considered to require the performance of substantial future services. The income recognized will be equal to the fair market value of the shares at the time of receipt less any purchase price paid for the shares. If the shares are subject to a substantial risk of forfeiture, the

participant generally will recognize taxable ordinary income when the substantial risk of forfeiture lapses. If the substantial risk of forfeiture lapses in installments over several years, the participant will recognize income in each year in which the substantial risk of forfeiture lapses as to that installment. If the participant cannot sell the shares without being subject to suit under Section 16(b) of the Securities Exchange Act of 1934, as amended, also known as the short swing profits rule, the shares will be treated as subject to a substantial risk of forfeiture. The income recognized upon lapse of a substantial risk of forfeiture will be equal to the fair market value of the shares determined as of the time that the substantial risk of forfeiture lapses less any purchase price paid for the shares. Avidia Bancorp generally will be entitled to a deduction in an amount equal to the amount of ordinary income recognized by the participant, subject to the requirements of Code Section 162(m), as applicable.

Alternatively, unless prohibited by the Compensation Committee, a participant may make a timely election under Code Section 83(b) to recognize ordinary income for the taxable year in which the award was granted, in an amount equal to the fair market value of the shares subject to the award at the time of grant. That income will be taxable at ordinary income tax rates. If a participant makes a timely Code Section 83(b) election, the participant will not recognize income at the time the substantial risk of forfeiture lapses with respect to the shares. At the time of disposition of the shares, a participant who has made a timely Code Section 83(b) election will recognize capital gain or loss in an amount equal to the difference between the amount realized upon sale and the ordinary income recognized upon the grant of the award (increased by the amount paid for the shares subject to the award, if any). If the participant forfeits the shares after making a Code Section 83(b) election, the participant will not be entitled to a deduction with respect to the income recognized because of the election but will be entitled to a capital loss limited to the amount paid for the shares (if any). To be timely, the Code Section 83(b) election must be made within 30days after the participant receives the shares.

Avidia Bancorp will generally be entitled to a deduction in an amount equal to the amount of ordinary income recognized by the participant at the time of the election.

Restricted Stock Units. A participant generally is not taxed upon the grant of an RSU. Generally, if an RSU is designed to be settled on or shortly after the RSU is no longer subject to a substantial risk of forfeiture, then at the time of settlement in stock or cash the participant will recognize ordinary income equal to the amount of cash and/or the fair market value of the shares received by the participant (subject to the short swing profits rule) and Avidia Bancorp will be entitled to an income tax deduction for the same amount, subject to the requirements of Code Section 162(m), as applicable. However, if an RSU is not designed to be settled on or shortly after the RSU is no longer subject to a substantial risk of forfeiture, the RSU may be deemed a nonqualified deferred compensation plan under Code Section 409A. In that case, if the RSU is designed to meet the requirements of Code Section 409A, then at the time of settlement the participant will recognize ordinary income equal to the amount of cash and/or the fair market value of the shares received by the participant, and Avidia Bancorp will be entitled to an income tax deduction for the same amount. However, if the RSU is not designed to satisfy the requirements of Code Section 409A, the participant may be subject to income taxes and penalties under Code Section 409A in the event of a violation of it.

Nonqualified Stock Options. A participant generally is not taxed upon the grant of an NQSO. However, the participant must recognize ordinary income upon exercise of the NQSO in an amount equal to the difference between the NQSO exercise price and the fair market value of the shares acquired on the date of exercise (subject to the short swing profits rule). Avidia Bancorp generally will have a deduction in an amount equal to the amount of ordinary income recognized by the participant in Avidia Bancorp’s tax year during which the participant recognizes ordinary income, subject to the requirements of Code Section 162(m).

Upon the sale of shares acquired pursuant to the exercise of an NQSO, the participant will recognize capital gain or loss to the extent that the amount realized from the sale is different than the fair market value of the shares on the date of exercise. This gain or loss will be long-term capital gain or loss if the shares have been held for more than one year after exercise.

Incentive Stock Options. A participant is not taxed on the grant or exercise of an ISO. The difference between the exercise price and the fair market value of the shares covered by the ISO on the exercise date will, however, be a preference item for purposes of the alternative minimum tax. If a participant holds the shares acquired upon exercise of an ISO for at least two years following the ISO grant date and at least one year following exercise, the participant’s gain or loss, if any, upon a subsequent disposition of the shares is long-term capital gain or loss. The amount of the gain or loss is the difference between the proceeds received on disposition and the participant’s basis in the shares (which generally equals the ISO exercise price). If a participant disposes of shares acquired pursuant to exercise of an ISO before satisfying these holding periods and realizes an amount in excess of the exercise price, the amount realized will be taxed to the participant as ordinary income up to the fair market value of the shares on the exercise date and any additional amount realized will be taxable to the participant as capital gain in the year of disposition. However, if the exercise price exceeds the amount realized on sale, the difference will be taxed to the participant as a capital loss. Avidia Bancorp is not entitled to a federal income tax deduction on the grant or exercise of an ISO or on the participant’s disposition of the shares after satisfying the holding period requirement described above. If the holding periods are not satisfied, Avidia Bancorp will be entitled to a deduction in the year the participant disposes of the shares in an amount equal to any ordinary income recognized by the participant, subject to the requirements of Code Section 162(m).

For an option to qualify as an ISO for federal income tax purposes, the grant of the stock option must satisfy various other conditions specified in the Code. In the event a stock option is intended to be an ISO but fails to qualify as an ISO, it will be taxed as an NQSO as described above.

Performance Awards. A participant generally is not taxed upon the grant of restricted stock or restricted stock units granted subject to the satisfaction of performance conditions (such restricted stock or restricted stock units, “performance shares” or “performance share units”). The participant will recognize taxable income at the time of settlement of the performance share/unit in an amount equal to the amount of cash and the fair market value of the shares received upon settlement. The income recognized will be taxable at ordinary income tax rates. Avidia Bancorp generally will be entitled to a deduction in an amount equal to the amount of ordinary income recognized by the participant, subject to the requirements of Code Section 162(m). Any gain or loss recognized upon the disposition of the shares acquired pursuant to settlement of a performance share/unit will qualify as long-term capital gain or loss if the shares have been held for more than one year after settlement.

Golden Parachute Payments. The terms of the award agreement evidencing an award under the 2026 Equity Plan may provide for accelerated vesting or accelerated payout of the award in connection with a change in ownership or control of Avidia Bancorp. In such event, certain amounts with respect to the award may be characterized as “parachute payments” under the golden parachute provisions of the Code. Under Code Section 280G, no federal income tax deduction is allowed to Avidia Bancorp for “excess parachute payments” made to “disqualified individuals,” and receipt of such payments subjects the recipient to a 20% excise tax under Code Section 4999. For this purpose, “disqualified individuals” are generally officers, shareholders or highly compensated individuals performing services for Avidia Bancorp, and the term “excess parachute payments” includes payments in the nature of compensation which are contingent on a change in ownership or effective control of Avidia Bancorp, to the extent that such payments (in present value) equal or exceed three times the recipient’s average annual taxable compensation from Avidia Bancorp for the previous five years. Certain payments for reasonable compensation for services rendered after a change of control and payments from tax-qualified plans are

generally not included in determining “excess parachute payments.” If payments or acceleration occur with respect to awards granted under the 2026 Equity Plan, certain amounts in connection with such awards may constitute “parachute payments” and be subject to these “golden parachute” tax provisions.

Compensation of Covered Employees. The ability of Avidia Bancorp (or, if applicable, the ability of one of its subsidiaries) to obtain a deduction for amounts paid under the 2026 Equity Plan could be limited by Code Section 162(m), which limits Avidia Bancorp’s ability to deduct compensation, for federal income tax purposes, paid during any year to a “covered employee” in excess of $1,000,000. “Covered employees” for a fiscal year include any person who served as CEO or CFO of a company at any time during that fiscal year, the three other most highly compensated company executive officers for that fiscal year (whether or not employed on the last day of that fiscal year) and any other person who was a covered employee in a previous taxable year. Any awards that Avidia Bancorp grants pursuant to the 2026 Equity Plan to covered employees, whether performance-based or otherwise, will be subject to the $1.0 million annual deduction limitation. While the Compensation Committee intends to consider the deductibility of compensation when making equity awards, it is only one factor it considers. Because of the elimination of the performance-based compensation exemption, the Compensation Committee expects that a portion of the compensation paid to covered employees in the form of equity grants under the 2026 Equity Plan may not be deductible by Avidia Bancorp.

New 2026 Equity Plan Benefits

Except as disclosed above with respect to the self-executing grants to non-employee directors upon approval of the 2026 Equity Incentive Plan, any future awards to executive officers, non-employee directors, employees and service providers of Avidia Bancorp under the 2026 Equity Plan are discretionary and cannot be determined at this time. As a result, the benefits and amounts that will be received or allocated under the 2026 Equity Plan are not determinable at this time, and Avidia Bancorp has not included a table that reflects such future awards.

Board Recommendation

The Board of Directors unanimously recommends that you vote “FOR” approval of the Avidia Bancorp, Inc. 2026 Equity Incentive Plan.

Item 3 — Ratification of Appointment of Independent Registered Public Accounting Firm

BDMP Assurance, LLP (successor to Berry, Dunn, McNeil & Parker, LLC) served as our independent registered public accounting firm for the fiscal year ended December 31, 2025. The Audit Committee of the Board of Directors has appointed BDMP Assurance, LLP to serve as the independent registered public accounting firm for the 2026 fiscal year, subject to ratification by stockholders. A representative of BDMP Assurance, LLP is expected to be present at the annual meeting to respond to appropriate questions from stockholders and will have the opportunity to make a statement should he or she desire to do so.

If the appointment of the independent registered public accounting firm is not ratified by a majority of the votes cast by stockholders at the annual meeting, the Audit Committee of the Board of Directors will consider other independent registered public accounting firms.

The Board of Directors unanimously recommends that you vote “FOR” ratification of the appointment of BDMP Assurance, LLP to serve as the independent registered public accounting firm.

Audit Fees. The following table sets forth the fees that BDMP Assurance, LLP and Berry, Dunn, McNeil & Parker, LLC billed for the fiscal years ended December 31, 2025 and 2024:

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Change in Independent Registered Public Accounting Firm. On November 12, 2025, the Audit Committee of the Board of Directors approved the dismissal of Berry, Dunn, McNeil & Parker, LLC, the Company’s independent registered public accounting firm, effective as of November 12, 2025. Concurrently, the Audit Committee approved the engagement of BDMP Assurance, LLP as the Company’s new independent registered public accounting firm for the fiscal year ending December 31, 2025, effective as of November 12, 2025. BDMP Assurance, LLP, a licensed CPA firm registered with the Public Company Accounting Oversight Board (PCAOB), is owned by certain partners of Berry, Dunn, McNeil & Parker, LLC.

The decision to transition to a new independent registered public accounting firm was the result of Berry, Dunn, McNeil & Parker, LLC’s recent restructuring. In this new structure, Berry, Dunn, McNeil & Parker, LLC is focused on tax and advisory services, while BDMP Assurance, LLP performs financial statement audits.

The reports of Berry, Dunn, McNeil & Parker, LLC on the Company’s consolidated financial statements for the fiscal years ended December 31, 2023 and December 31, 2024 did not contain an adverse opinion or a disclaimer of opinion, nor were they qualified or modified as to uncertainty, audit scope, or accounting principles.

During the Company’s two most recent fiscal years ended December 31, 2024 and 2023, and the subsequent interim period preceding the dismissal of Berry, Dunn, McNeil & Parker, LLC, there were (i) no disagreements (as defined in Item 304(a)(1)(iv) of Regulation S-K) with Berry, Dunn, McNeil & Parker, LLC on any matter of accounting principles or practices, financial statement disclosure, or auditing scope or procedure, which disagreements, if not resolved to the satisfaction of Berry, Dunn, McNeil & Parker, LLC, would have caused it to make reference to the subject matter thereof in connection with its reports on the consolidated financial statements for such years, and (ii) no “reportable events” (as defined in Item 304(a)(1)(v) of Regulation S-K).

During the fiscal years ended December 31, 2024 and 2023, and the subsequent interim period preceding the engagement of BDMP Assurance, LLP, neither the Company nor anyone on the Company’s behalf consulted with BDMP Assurance, LLP with respect to either (i)(a) the application of accounting principles to a specified transaction, either completed or proposed, or (b) the type of audit opinion that might be rendered on the Company’s consolidated financial statements, and neither a written report nor oral advice was provided by BDMP Assurance, LLP to the Company that BDMP Assurance, LLP concluded was an important factor that the Company consider in reaching a decision as to any accounting,

auditing or financial reporting issue, or (ii) any other matter that was the subject of a “disagreement” or a “reportable event” (as these terms are defined in Item 304(a)(1) of Regulation S-K).

Policy on Audit Committee Pre-Approval of Audit and Permissible Non-Audit Services of Independent Registered Public Accounting Firm. The Audit Committee is responsible for appointing, setting compensation and overseeing the work of the independent registered public accounting firm. According to its charter, the Audit Committee approves, in advance, all audit and permissible non-audit services to be performed by the independent registered public accounting firm. This approval process ensures that the independent registered public accounting firm does not provide any non-audit service to us prohibited by law or regulation. During the fiscal year ended December 31, 2025, all fees set forth in the table above were approved by the Audit Committee.

Executive Compensation

Summary Compensation Table

The following tabular information is furnished for our principal executive officer and the two most highly compensated executive officers (other than the principal executive officer) serving during the fiscal year ended December 31, 2025, whose total compensation exceeded $100,000 for the fiscal year ended December 31, 2025. These individuals are sometimes referred to in this proxy statement as the “named executive officers.”

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Executive Compensation Discussion. For 2025, Mr. Nelson was identified as a named executive officer based on completion of his first full-year of employment. In 2024, the Company's non-equity

incentive plan compensation included both a short-term incentive plan, referred to as the “Annual Bonus Program,” and a Long-Term Incentive Plan, which are discussed below. Annual targets were set for the 2025 Annual Bonus Program, but no payouts were earned due to the earnings impact of the elevated loan loss provision expense recorded due to one large loan loss. During 2025, the Board of Directors awarded discretionary bonuses to the named executive officers to recognize their contributions to the successful completion of the Company’s initial public offering, as well as progress on major strategic initiatives. The Long-Term Incentive Plan was terminated and paid out, with no grants awarded in 2025. The Board of Directors awarded discretionary grants in 2025 in lieu of the grants under the Long-Term Incentive Plan, which are reported in the “Bonus Column” in the above Summary Compensation Table.

Employment Agreements. Avidia Bank has entered into employment agreements with Messrs. Cozzone and Nelson. The initial terms of the employment agreements began as of the effective date of the mutual-to-stock conversion of the former Assabet Valley Bancorp, Avidia bank’s former mutual holding company, and the Company’s related conversion stock offering and ends on the third anniversary (in the case of Mr. Cozzone) or second anniversary (in the case of Mr. Nelson) of that date. Commencing on the first anniversary of the effective date of the agreements and on each anniversary date thereafter, the terms of the agreements will extend automatically for one additional year, so that the remaining term is again three or two years, as applicable, unless either Avidia Bank or the executive gives notice to the other party of non-renewal. If either party provides a notice of non-renewal, the term will become fixed at that time and expire at the end of the then current term. Notwithstanding the foregoing, if Avidia Bancorp or Avidia Bank enters a transaction that would constitute a change in control, as defined under the employment agreement, the term of the agreement would automatically extend so that it would expire no less than two years following the effective date of the change in control.

The employment agreements specify the base salaries for Messrs. Cozzone and Nelson. Avidia Bank’s board of directors or its Compensation Committee may increase, but not decrease, their base salaries. In January 2026, Mr. Cozzone’s base salary was increased to $760,725 and Mr. Nelson's base salary increased to $380,625. In addition to base salary, the agreements provide that the executive will participate in any bonus plan or arrangement of Avidia Bank in which senior management is eligible to participate and/or may receive a bonus on a discretionary basis, as determined by the board of trustees. Avidia Bank will provide a short-term target cash bonus opportunity for the executive of at least 55% of base salary (in the case of Mr. Cozzone) and of at least 35% of base salary (in the case of Mr. Nelson) and a long-term target cash bonus opportunity of at least 25% of base salary for each executive. Each executive is also entitled to participate in all employee benefit plans, arrangements and perquisites offered to employees and officers of Avidia Bank and the reimbursement of reasonable travel and other business expenses incurred in the performance of his duties for Avidia Bank. Avidia Bank will also provide the executives with reimbursement or payment for the use of an automobile and will also pay or reimburse Mr. Cozzone for the cost of a country club membership.

Avidia Bank may terminate the executive’s employment, or the executive may resign from employment, at any time with or without good reason. Under the employment agreement, if Avidia Bank terminates the executive's employment without cause or the executive resigns for “good reason” (i.e., a “qualifying termination event”), Avidia Bank will pay him a severance payment equal to the greater of (i) the remaining base salary and total annual bonus opportunity (based on the highest annual bonus earned during the three most recent calendar years before his date of termination) he would have received during the remaining term of the employment agreement or (ii) two times (in the case of Mr. Cozzone) or one times (in the case of Mr. Nelson) the sum of his base salary and the average annual incentive bonus for the three most recently completed calendar years before the date of termination. In addition, the executive

will be reimbursed for his monthly COBRA premium payments for the greater of the term of the agreement or 18 months.

If a qualifying termination event occurs during the term of the agreement on or within two years following a change in control of Avidia Bancorp or Avidia Bank, the executive would be entitled to (in lieu of the payments and benefits described in the previous paragraph) a severance payment equal to three times (in the case of Mr. Cozzone) or two times (in the case of Mr. Nelson) the sum of (i) his base salary in effect as of the date of termination (or during the three preceding years, if higher) and (ii) average annual total incentive bonus earned by him for the three most recently completed calendar years before the change in control (or, if greater, the annual total incentive bonus that would have been earned in the year of the change in control at target bonus opportunity). In addition, he would receive a lump sum payment equal to the value of 36 (in the case of Mr. Cozzone) or 24 (in the case of Mr. Nelson) months' health care cost (based on the cost of COBRA premium payments).

The term “good reason” includes (i) a material reduction in base salary and/or aggregate incentive compensation opportunities (unless the reduction is part of a non-discriminatory reduction applicable to all executive officers), (ii) a material reduction in authority, duties or responsibilities, (iii) the failure to re-appoint the executive to his executive position or the failure to nominate and recommend his election to Avidia Bancorp’s board of directors or to appoint or nominate and elect him to Avidia Bank’s board of directors, (iv) a relocation of the executive’s principal place of employment by more than 20 miles, or (v) a material breach of the employment agreement by Avidia Bank.

The employment agreement terminates upon the executive’s death or disability. Upon termination of employment (other than a termination in connection with a change in control), the executive will be required to adhere to 6-month non-competition (other than in connection with a termination without cause or a resignation for good reason) and 1-year non-solicitation restrictions set forth in the employment agreement.

The non-competition and non-solicitation covenants apply following a change in control for a period mutually to be agreed to by the parties, which will be no less than six months nor exceed one year. If payments and benefits provided to the executive become subject to Sections 280G and 4999 of the Internal Revenue Code of 1986, as amended (the “Code”), and after considering the value of the non-competition and non-solicitation covenants, the payments will be reduced if the reduction would leave him financially better off on an after-tax basis than if he received the entire payment and was obligated to pay the excise tax under Section 4999 of the Code.

Change in Control Agreements. Avidia Bank has entered into change in control agreements with certain executives, including Mr. Murphy, which became effective as of the effective date of the mutual-to-stock conversion of the former Assabet Valley Bancorp and the Company’s related conversion stock offering.

The change in control agreement with Mr. Murphy has an initial term of 12 months. Each year, the term of the change in control agreements automatically will extend for an additional 12 months, so that the term is again 12 months, unless either party gives at least 60 days written notice of non-renewal to the other. If Avidia Bank or Avidia Bancorp enters into an agreement to effect a change in control, the term of the agreement will automatically renew for 12 months from the effective date of the change in control.

If the executive’s employment involuntary terminates for reasons other than cause, or if the executive resigns for “good reason,” in either case following a change in control and during the term of the agreement, the executive will receive a severance payment, paid in a single lump sum, equal to one time the

sum of the executive’s base salary and the annual total incentive bonus that would have been earned in the year of the change in control at target bonus opportunity. In addition, if the executive elects COBRA coverage, the executive will be reimbursed for the monthly COBRA premium payments for up to 12 months. For purposes of the change in control agreement, the term “good reason” includes (i) the assignment to the executive by Avidia Bank of any duties which are materially inconsistent with the executive’s positions, duties, responsibilities, and status immediately before a change in control, or a material change in the executive’s reporting responsibilities, titles or offices as an officer and employee and as in effect immediately before the change in control, or any removal of the executive from or any failure to re-elect the executive to any of his responsibilities, titles or offices (other than in connection with a termination without cause or a resignation for good reason), (ii) a reduction in the executive’s base salary or bonus/incentive award opportunity under Avidia Bank’s (or its successor’s) incentive compensation plans or arrangements as in effect immediately before the date of the change in control or as the same may be increased from time to time thereafter or a reduction in the package of fringe benefits provided to the executive as in effect immediately before the date of the change in control, (iii) a change in the executive’s principal place of employment by a distance in excess of 25 miles from its location immediately before the change in control, or (iv) the failure of the successor to assume and honor the change in control agreement. With respect to payments and benefits made or provided in connection with a change in control, if the payments and benefits constitute an excess parachute payment, then the payments and benefits will be reduced to an amount that is one dollar less than three times the executive’s “base amount” (as that term is defined for Section 280G of the Code) if doing so would result in a higher after-tax benefit to the executive than the executive receiving all of the payments and benefits and paying any income and excise taxes on those amounts.

Defined Contribution Plan for Mr. Cozzone. Avidia Bank sponsors the Defined Contribution Plan for Mr. Cozzone (the “Defined Contribution Plan”). Under the Defined Contribution Plan, Avidia Bank may credit amounts to his deferral account. While Avidia Bank is not obligated to make contributions to the Defined Contribution Plan, it generally makes contributions in an amount to provide Mr. Cozzone with a retirement benefit equal to 70% of his Final Average Compensation (as defined below), offset by (i) his 401(k) Plan account balance attributable to employer matching contributions as of his separation from service and (ii) his Social Security benefit at age 65 derived from Avidia Bank’s contributions to his Social Security benefit. The Defined Contribution Plan defines Mr. Cozzone’s Final Average Compensation as the average of the three highest years of his annual base salary and bonus over the five consecutive years immediately preceding his separation from service. Each year, Avidia Bank credits interest to Mr. Cozzone’s deferral account at a rate of four percent. Mr. Cozzone becomes vested in the benefit under Defined Contribution Plan over 10 years beginning on January 1, 2023. He is zero percent vested over the first five years of service and then becomes vested at the rate of 20% per year over the next five years. He will become 100% vested in his benefit upon his death, disability or a change in control. The vested benefit will be distributed to him in a lump sum following his separation from service upon the later of his separation from service and attaining age 65. However, if he separates from service between the ages of 62 and 65, the benefit will be distributed within 90 days following his separation from service. If Mr. Cozzone dies, the benefit will be distributed to his beneficiary within 90 days of the date of his death. In the event of Mr. Cozzone’s involuntary separation from service by Avidia Bank within two years following a change in control, the lump sum benefit will be paid within 90 days following his separation from service.

Supplemental Executive Retirement Agreements. Avidia Bank is a party to certain Supplemental Executive Retirement Agreements (SERPs), including with Mr. Murphy. Under the SERPs, the executives are entitled to a retirement benefit upon their separation from service other than for cause. Upon their separation from service at or after attaining age of 65 (not within two years following a change in control), the executives are entitled to a lump sum benefit. The lump sum benefit is $2,028,268 for Mr. Murphy. If the executive separates from service before age 65, the executive will receive a reduced lump

sum benefit based on the vesting schedule set forth in the executive’s agreement. Mr. Murphy is currently 88% vested in his benefit. Each executive will become fully vested in his or her benefit upon (i) his or her disability or death, (ii) his or her termination by Avidia Bank other than for cause, or (iii) his or her resignation following a material breach of the agreement. If the executive separates from service within two years following a change in control due to his or her termination by Avidia Bank (other than for cause) or due to his or her resignation for good reason, the executive will be entitled to a lump sum payment of the full retirement benefit. The SERPs define “good reason” as (i) a material breach of the agreement, or the following if they occur within two years following a change in control, (ii) a reduction in the executive’s annual base salary (other than certain across-the-board salary reductions), (iii) a significant diminution in the executive's responsibilities, authorities, powers, functions or duties, or (iv) a relocation of 40 miles or more. If the executives become disabled, the benefits under the SERPs will be paid within 10 days following the executive’s attainment of age 65. If the executive dies, the benefit will be paid within 60 days of the executive’s date of death. In addition, if the executive dies after receiving a benefit, the executive’s beneficiary will receive a death benefit of $25,000.

Annual Bonus Plan. Avidia Bank maintains an Annual Bonus Plan for employees, including the named executive officers. Employees must be employed on October 1st of the performance year to be eligible to receive an award under the plan. Employees hired between January 1stand October 1st of the plan year are eligible to receive a pro rata portion of an award. For awards to be paid under the plan, Avidia Bank must achieve its threshold level of performance, which was based on net operating income in 2025. If that level is achieved, net operating income is weighted 50% and other performance measures (return on average assets, return on average equity and non-performing assets as a percent of assets) are collectively weighted 50%. Employees with titles of Vice President or greater also have individual performance measures that, if achieved, allow them to earn awards up to 150% of target. Employees must generally be employed on the payment date to receive payment of the award. However, employees who retire as of December 31st of the performance year may receive a payment of an award even though they are not employed on the payment date.

Long-Term Incentive Plan. Before 2025, Avidia Bank sponsored the Avidia Bank Long Term Incentive Plan (the “LTIP”) for select employees, including the named executive officers and members of Avidia Bank’s board of directors). The LTIP consisted of grants of phantom stock units indexed to Avidia Bank’s Tier 1 Capital. Participants received a grant under the LTIP each year based on Avidia Bank’s performance. A participant’s annual award was paid (based on the increase in Tier 1 Capital) as the awards became vested. Awards vested over a period of four years after the awards were granted. Avidia Bank amended and terminated the prior LTIP in 2025. Vesting of all prior phantom stock grants were accelerated and paid out at targeted levels in April 2025, and no additional grants were made in 2025.

401(k) Plan. Avidia Bank maintains a tax-qualified defined contribution plan under which eligible employees may elect to defer a portion of their compensation and receive certain employer contributions (the “401(k) Plan”). The named executive officers are eligible to participate in the 401(k) Plan on the same terms as other eligible employees of Avidia Bank. Eligible employees who are at least 18 years of age generally become participants in the 401(k) Plan after they have been employed for one month.

A 401(k) Plan participant may elect to defer a portion of their eligible compensation. For 2026, the salary deferral contribution limit is $24,500; provided, however, that a participant over age 50 may contribute an additional amount to the 401(k) Plan. In addition to salary deferral contributions, Avidia Bank makes matching contributions on behalf of participants who make elective deferrals under the 401(k) Plan. A participant is immediately 100% vested in his or her salary deferral contributions and matching contributions.

Employee Stock Ownership Plan. Avidia Bank has adopted an employee stock ownership plan (the “ESOP”) for eligible employees. The named executive officers are eligible to participate in the ESOP on the same terms as other eligible employees.

The ESOP trustee holds the shares purchased by the employee stock ownership plan in an unallocated suspense account, and shares are released from the suspense account on a pro-rata basis as the trustee repays the loan. The trustee will allocate the shares released among participants’ accounts based on each participant’s proportional share of compensation relative to all participants. A participant becomes fully vested in his or her account balance after completing three years of service with Avidia Bank. Participants who have not completed three years of service will not have any vested interest in the ESOP. Participants also will automatically become fully vested upon attaining their normal retirement age (age 65), death or disability, a change in control, or termination of the ESOP. Generally, participants will receive distributions from the ESOP upon terminating employment according to the terms of the plan document. The ESOP reallocates any unvested shares forfeited upon a participant’s termination of employment among the remaining participants.

Outstanding Equity Awards at December 31, 2025

There were no equity awards outstanding to any of the named executive officers as of December 31, 2025.

Other Information Relating to Directors and Executive Officers

Section 16(a) Beneficial Ownership Reporting Compliance

Section 16(a) of the Securities Exchange Act of 1934, as amended, requires the Company’s executive officers and directors, and persons who own more than 10% of any registered class of our equity securities, to file reports of ownership and changes in ownership with the Securities Exchange Commission. Executive officers, directors and greater than 10% stockholders are required by regulation to furnish us with copies of all Section 16(a) reports they file.

Based solely on our review of the copies of the reports we have received and of written representations provided to us by the individuals required to file the reports, we believe that each executive officer, director and greater than 10% beneficial owner has complied with applicable reporting

requirements for transactions in Company common stock during the fiscal year ended December 31, 2025.

Transactions with Related Persons

Extensions of Credit. The Sarbanes-Oxley Act of 2002 generally prohibits publicly-traded companies from making loans to their executive officers and directors, but it contains a specific exemption from that prohibition for loans made by federally-insured financial institutions, such as Avidia Bank, to their executive officers and directors in compliance with federal banking regulations. At December 31, 2025, all loans made by Avidia Bank to our directors and executive officers were made in the ordinary course of business, were made on substantially the same terms, including interest rates and collateral, as those prevailing at the time for comparable loans with persons not related to Avidia Bank, and did not involve more than the normal risk of collectability or present other unfavorable features. These loans were performing according to their original terms at December 31, 2025, and were made in compliance with federal banking regulations.

Other Transactions. Director Jeffrey Leland is an attorney-at-law whose law firm performs conveyancing and residential loan closing services for loans made by Avidia Bank. During the fiscal year ended December 31, 2025, Avidia Bank did not pay any legal fees to the law firm.

Director Michael Murphy is President of Murphy Group LLC, an insurance broker. Avidia Bank purchases insurance for its business using the brokerage services of Murphy Group LLC. During the fiscal year ended December 31, 2025, Avidia Bank paid $485,000 in insurance premiums from which the recipient insurance companies paid brokerage commissions to Murphy Group LLC. Avidia Bank did not pay any direct compensation to Murphy Group LLC.

Submission of STOCKHOLDER Business Proposals and Nominations

The Company must receive proposals that shareholders seek to include in the proxy statement for its next annual meeting no later than April 9, 2027. If next year’s annual meeting is held on a date that is more than 30 calendar days from September 15, 2027, a shareholder proposal must be received by a reasonable time before we begin to print and mail our proxy solicitation materials for such annual meeting. Any shareholder proposals will be subject to the requirements of the proxy rules adopted by the Securities and Exchange Commission.

Under Securities and Exchange Commission Rule 14a-19, a stockholder intending to engage in a director election contest with respect to the annual meeting of stockholders to be held in 2027 must give the Company notice of its intent to solicit proxies by providing the name(s) of its nominee(s) and certain other information at least 60 calendar days before the anniversary of the previous year’s annual meeting. If next year’s annual meeting is held on a date that is more than 30 calendar days from September 15, 2027, then notice must be given by the later of 60 calendar days before the date of the annual meeting or the 10th calendar day following the day on which the Company first makes public announcement of the date of the annual meeting.

In addition to the requirement set forth under Securities and Exchange Commission Rule 14a-19, under the Company’s bylaws, for a stockholder to properly bring business before an annual meeting or make nominations for the election of directors, the stockholder must give written notice to our Corporate Secretary at our principal executive office not less than 90 days nor more than 100 days before the anniversary of the prior year’s annual meeting of stockholders; provided, however, that if the date of the annual meeting is advanced more than 30 days before the anniversary of the prior year’s annual meeting of stockholders, such written notice shall be timely only if delivered or mailed to and received by the

Corporate Secretary at the principal executive office no earlier than the day on which public disclosure of the date of such annual meeting is first made and not later than the 10th day following the earlier of the day notice of the meeting was mailed to stockholders or such public disclosure was made. Such written notice must also contain the information specified by the Bylaws. A copy of the Bylaws may be obtained by contacting our Corporate Secretary.

STOCKholder Communications

Stockholders who wish to communicate with the Board of Directors or an individual director should do so in writing to Avidia Bancorp, Inc., 42 Main Street, Hudson, MA 01749. Communications regarding financial or accounting policies may be made in writing to the Chair of the Audit Committee, at the same address. All other communications should be sent in writing to the attention of the Chair of the Nominating/Corporate Governance Committee at the same address.

Miscellaneous

We will pay the cost of this proxy solicitation and will reimburse brokerage firms and other custodians, nominees and fiduciaries for reasonable expenses they incur in sending proxy materials to the beneficial owners of Company common stock. In addition to soliciting proxies by mail, our directors, officers and regular employees may solicit proxies personally or by telephone without receiving additional compensation. We have also engaged Morrow Sodali LLC to assist in the proxy solicitation for a fee of $12,500, plus reimbursable expenses and telephone solicitation charges.

The Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2025, accompanies this proxy statement. Any stockholder who has not received a copy of the Form 10-K may obtain one by writing to our Corporate Secretary or by accessing a copy online. See “Important Notice Regarding the Availability of Proxy Materials for the Stockholder Meeting to be Held on September 15, 2026.” The Form 10-K is not to be treated as part of the proxy solicitation material or as having been incorporated in this proxy statement by reference.

If you and others who share your address own your shares of Company common stock in “street name,” your broker or other holder of record may be sending only one annual report and proxy statement to your address. This practice, known as “householding,” is designed to reduce printing and postage costs. However, if a stockholder residing at such an address wishes to receive a separate annual report or proxy statement in the future, the stockholder should contact the broker or other holder of record. If you own your shares in “street name” and are receiving multiple copies of the annual report and proxy statement, you can request householding by contacting your broker or other holder of record.

Please vote today by marking, signing, dating and returning a proxy card or by voting via the Internet or telephone.

BY ORDER OF THE BOARD OF DIRECTORS

Linda P. Marrone

Corporate Secretary

Hudson, MA

August 7, 2026

Appendix A

AVIDIA BANCORP, INC.

2026 EQUITY INCENTIVE PLAN

ARTICLE 1 - GENERAL

Section 1.1 Purpose, Effective Date and Term. The purpose of this Avidia Bancorp, Inc. 2026 Equity Incentive Plan (the “Plan”) is to promote the long-term financial success of Avidia Bancorp, Inc. (the “Company”), and its Subsidiaries, including Avidia Bank (the “Bank”) by providing a means to attract, retain and reward individuals who contribute to that success and to further align their interests with those of the Company’s shareholders through the ownership of shares of Company Stock. The “Effective Date” of the Plan shall be the date on which the Plan satisfies the applicable shareholder approval requirements. The Plan will remain in effect as long as any Awards remain outstanding; provided, however, that no Awards may be granted under the Plan after the day immediately prior to the ten-year anniversary of the Effective Date.

Section 1.2 Administration. The Plan shall be administered by the Compensation Committee of the Board of Directors (the “Committee”), except as provided for in, and in accordance with, Section 5.1.

Section 1.3 Participation. Each individual who is granted or holds an Award in accordance with the terms of the Plan will be a Participant in the Plan (a “Participant”). The grant of Awards shall be limited to Employees and Directors of, and service providers to, the Company or any Subsidiary.

Section 1.4 Definitions. Capitalized terms used in the Plan are defined in Article 8 and elsewhere in the Plan.

ARTICLE 2 - AWARDS

Section 2.1 General. Any Award under the Plan may be granted singularly, or in combination with another Award (or Awards). Each Award under the Plan shall be subject to the terms and conditions of the Plan and any additional terms, conditions, limitations and restrictions provided by the Committee with respect to the Award and as evidenced in an Award Agreement. Every Award under the Plan shall require a written Award Agreement. Subject to the provisions of Section 2.2(d), an Award may be granted as an alternative to or replacement of an existing award under the Plan or any other plan of the Company or any Subsidiary (provided, however, that no reload Awards shall be granted hereunder) or as the form of payment for grants or rights earned or due under any other compensation plan or arrangement of the Company or its Subsidiaries, including without limitation the plan of any entity acquired by the Company or any Subsidiary. The types of Awards that may be granted under the Plan include:

(a) Stock Options. A Stock Option means a grant under Section 2.2 that represents the right to purchase shares of Stock at an Exercise Price established by the Committee. Any Stock Option may be either an Incentive Stock Option (an “ISO”) that is intended to satisfy the requirements applicable to an “incentive stock option” described in Code Section 422(b), or a Non-Qualified Stock Option (a “Non-Qualified Option”) that is not intended to be an ISO, provided, however, that no ISOs may be granted: (i) after the ten-year anniversary of the Effective Date or the date the Plan is approved by the Board of Directors, whichever is earlier, or (ii) to a non-Employee. Unless otherwise specifically provided by its terms, any Stock Option granted under the Plan to an Employee shall be an ISO to the maximum extent permitted. Any ISO granted under this Plan that does not qualify as an ISO for any reason (whether at the time of grant or as the result of a subsequent event) shall be deemed to be a Non-Qualified Option. In addition, any ISO granted under this Plan may be unilaterally modified by the Committee to disqualify the Stock Option from ISO treatment such that it shall become a Non-Qualified Option; provided however, that any modification will be ineffective if it causes the Award to be subject to Code Section 409A (unless, as modified, the Award complies with Code Section 409A).

(b) Restricted Stock Awards. A Restricted Stock Award means a grant of shares of Stock under Section 2.3 for no consideration or for such minimum consideration as may be required by applicable law, subject to a time-based vesting schedule or the satisfaction of market conditions or performance conditions.

(c) Restricted Stock Units. A Restricted Stock Unit means a grant under Section 2.4 denominated in shares of Stock that is similar to a Restricted Stock Award except no shares of Stock are actually awarded on the date of grant of a Restricted Stock Unit. A Restricted Stock Unit is subject to a time-based vesting schedule or the satisfaction of market conditions or performance conditions and shall be settled in shares of Stock, cash, or a combination thereof.

(d) Performance Awards. A Performance Award means an Award granted under Sections 2.2, 2.3 or 2.4 that vests upon the achievement of one or more specified performance measures, as further set forth in Section 8.1 under “Performance Award.”

Section 2.2 Stock Options.

(a) Grant of Stock Options. Each Stock Option shall be evidenced by an Award Agreement that specifies: (i) the number of Stock Options covered by the Award; (ii) the date of grant of the Stock Option and the Exercise Price; (iii) the vesting period or conditions to exercisability or vesting; and (iv) such other terms and conditions not inconsistent with the Plan, including the effect of termination of a Participant’s employment or Service with the Company as the Committee may, in its discretion, prescribe. Stock Options may be granted as Performance Awards.

(b) Terms and Conditions. A Stock Option shall be exercisable in accordance with such terms and conditions and during such periods as may be established by the Committee. In no event, however, shall a Stock Option expire later than ten (10) years after the date of its grant (or five (5) years with respect to an ISO granted to an Employee who is a 10% Stockholder). The “Exercise Price” of each Stock Option shall not be less than 100% of the Fair Market Value of a share of Stock on the date of grant (or, if greater, the par value of a share of Stock); provided, however, that the Exercise Price of an ISO shall not be less than 110% of Fair Market Value of a share of Stock on the date of grant if granted to a 10% Stockholder; further, provided, that the Exercise Price may be higher or lower in the case of Stock Options granted or exchanged in replacement of existing Awards held by an employee or director of or service provider to an acquired entity. The payment of the Exercise Price shall be by cash or, subject to limitations imposed by applicable law, by such other means as the Committee may from time to time permit, including: (i) by tendering, either actually or constructively by attestation, shares of Stock valued at Fair Market Value as of the date of exercise; (ii) by irrevocably authorizing a third party, acceptable to the Committee, to sell shares of Stock (or a sufficient portion of the shares) acquired upon exercise of the Stock Option and to remit to the Company a sufficient portion of the sale proceeds to pay the entire Exercise Price and any tax withholding resulting from such exercise; (iii) by net settlement of the Stock Option, using a portion of the shares of Stock obtained on exercise in payment of the Exercise Price (and if applicable, tax withholding); (iv) by personal, certified or cashier’s check; (v) by other property deemed acceptable by the Committee; or (vi) by any combination thereof. The total number of shares of Stock that may be acquired upon the exercise of a Stock Option shall be rounded down to the nearest whole share, with cash-in-lieu paid by the Company, at its discretion, for the value of any fractional share.

(c) Prohibition of Cash Buy-Outs of Underwater Stock Options. Under no circumstances will any Stock Option with an Exercise Price as of an applicable date that is greater than the Fair Market Value of a share of Stock as of the same date that was granted under the Plan be bought back by the Company without shareholder approval.

(d) Prohibition Against Repricing. Except for adjustments pursuant to Section 3.4, and reductions of the Exercise Price approved by the Company’s shareholders, neither the Committee nor the Board of Directors shall have the right or authority to (i) make any adjustment or amendment that reduces or would have the effect of reducing the Exercise Price of a Stock Option previously granted under the Plan, (ii) cancel a Stock Option when the Exercise Price per share exceeds the Fair Market Value of one share of Stock in exchange for cash or another Award (other than in connection with a Change in Control), or (iii) take any other action with respect to a Stock Option that

would be treated as a repricing under the rules and regulations of the principal U.S. Exchange on which the shares of Stock are listed.

(e) Prohibition on Paying Dividends. No dividends shall be paid on Stock Options, and no Dividend Equivalent Rights may be granted with respect to Stock Options.

Section 2.3. Restricted Stock Awards.

(a) Grant of Restricted Stock. Each Restricted Stock Award shall be evidenced by an Award Agreement, that specifies: (i) the number of shares of Stock covered by the Restricted Stock Award; (ii) the date of grant of the Restricted Stock Award; (iii) the vesting period or conditions to vesting; and (iv) such other terms and conditions not inconsistent with the Plan, including the effect of termination of Participant’s employment or Service with the Company as the Committee may, in its discretion, prescribe. Restricted Stock Awards may be granted as Performance Awards. All Restricted Stock Awards shall be in the form of issued and outstanding shares of Stock. Restricted Stock granted under the Plan may be evidenced in such manner as the Committee shall determine, including electronically and/or solely on the books and records maintained by the transfer agent. If certificates representing Restricted Stock are registered in the name of the Participant, the Committee may require that such certificates bear an appropriate legend referring to the terms, conditions and restrictions applicable to such Restricted Stock (including that the Restricted Stock may not be sold, encumbered, hypothecated or otherwise transferred except in accordance with the terms of the Plan and Award Agreement) and/or that the Company retain physical possession of the certificates, and that the Participant deliver a stock power to the Company, endorsed in blank, relating to the Restricted Stock.

(b) Terms and Conditions. Each Restricted Stock Award shall be subject to the following terms and conditions:

(i) Dividends. No cash dividends shall be paid with respect to any Restricted Stock Awards unless and until the Participant vests in the underlying share(s) of Restricted Stock. Upon the vesting of a Restricted Stock Award, any dividends declared but not paid during the vesting period shall be paid within thirty (30) days following the vesting date. Any stock dividends declared on shares of Stock subject to a Restricted Stock Award shall be subject to the same restrictions and shall vest at the same time as the shares of Restricted Stock from which said dividends were derived. All unvested dividends shall be forfeited by the Participants to the extent his or her underlying Restricted Stock Awards are forfeited.

(ii) Voting Rights. Unless the Committee determines otherwise with respect to any Restricted Stock Award and specifies such determination in the relevant Award Agreement, a Participant shall have voting rights related to unvested, non-forfeited Restricted Stock Awards and the voting rights may be exercised by the Participant in his or her discretion.

(iii) Tender Offers and Merger Elections. Each Participant to whom a Restricted Stock Award is granted shall have the right to respond, or to direct the response, with respect to the related shares of Restricted Stock, to any tender offer, exchange offer, cash/stock merger consideration election or other offer made to, or elections made by, the holders of shares of Stock. Such a direction for any shares of Restricted Stock shall be given by proxy or ballot (if the Participant is the beneficial owner of the shares of Restricted Stock for voting purposes) or by completing and filing, with the inspector of elections, the trustee or such other person who shall be independent of the Company as the Committee shall designate in its direction (if the Participant is not a beneficial owner), a written direction in the form and manner prescribed by the Committee. If no direction is given, then the shares of Restricted Stock shall not be tendered.

Section 2.4 Restricted Stock Units.

(a) Grant of Restricted Stock Unit Awards. Each Restricted Stock Unit shall be evidenced by an Award Agreement that specifies: (i) the number of Restricted Stock Units covered by the Award; (ii) the date of grant of the Restricted Stock Units; (iii) the Restriction Period; and (iv) such other terms and conditions not

inconsistent with the Plan, including the effect of termination of a Participant’s employment or Services with the Company as the Committee may, in its discretion, prescribe.

(b) Terms and Conditions. Each Restricted Stock Unit Award shall be subject to the following terms and conditions:

(i) A Restricted Stock Unit Award shall be similar to a Restricted Stock Award except that no shares of Stock are actually awarded to the recipient on the date of grant. The Committee shall impose such conditions and/or restrictions on any Restricted Stock Unit Award granted pursuant to the Plan as it may deem advisable including, without limitation, a requirement that Participants pay a stipulated purchase price for each Restricted Stock Unit, time-based restrictions and vesting following the attainment of performance measures, restrictions under applicable laws or under the requirements of any Exchange or market upon which shares of Stock may be listed, or holding requirements or sale restrictions placed by the Company upon vesting of the Restricted Stock Units. The Committee may make grants of Restricted Stock Units upon such terms and conditions as it may determine, which may include, but is not limited to, deferring receipt of the underlying shares of Stock provided the deferral complies with Section 409A of the Code and applicable provisions of the Plan.

(ii) Restricted Stock Units may be granted as Performance Awards.

(iii) Subject to the provisions of the Plan and the applicable Award Agreement, during the period, if any, set by the Committee, commencing with the date of grant of a Restricted Stock Unit for which a Participant’s continued Service is required (the “Restriction Period”), and until the later of (A) the expiration of the Restriction Period and (B) the date the applicable performance measures (if any) are satisfied, the Participant shall not be permitted to sell, assign, transfer, pledge or otherwise encumber Restricted Stock Units.

(iv) A Participant shall have no voting rights with respect to any Restricted Stock Units granted hereunder.

(v) No dividends shall be paid on Restricted Stock Units. In the sole discretion of the Committee, exercised at the time of grant, Dividend Equivalent Rights may be assigned to Restricted Stock Units. A Dividend Equivalent Right, if any, shall be paid at the same time as the shares of Stock or cash subject to the Restricted Stock Unit are distributed to the Participant and is otherwise subject to the same rights and restrictions as the underlying Restricted Stock Unit.

Section 2.5 Vesting of Awards. The Committee shall specify the vesting schedule or conditions of each Award. At least ninety-five percent (95%) of all Awards under the Plan shall be subject to a vesting requirement of at least one year of Service following the grant of the Award and evidenced in the Award Agreement, subject to acceleration of vesting, to the extent authorized by the Committee or set forth in the Award Agreement, upon the Participant’s death, Disability or an Involuntary Termination in connection with a Change in Control as set forth in Article IV.

Section 2.6 Deferred Compensation. Subject to approval by the Committee before an election is made, an Award of Restricted Stock Units may be deferred pursuant to a valid deferral election made by a Participant. If a deferral election is made by a Participant, the Award Agreement shall specify the terms of the deferral and shall constitute the deferral plan pursuant to the requirements of Code Section 409A. If any Award would be considered “deferred compensation” as defined under Code Section 409A (“Deferred Compensation”), the Committee reserves the absolute right (including the right to delegate such right) to unilaterally amend the Plan or the Award Agreement, without the consent of the Participant, to maintain exemption from, or to comply with, Code Section 409A. Any amendment by the Committee to the Plan or an Award Agreement pursuant to this Section 2.6 shall maintain, to the extent practicable, the original intent of the applicable provision without violating Code Section 409A. A Participant’s acceptance of any Award under the Plan constitutes acknowledgement and consent to such rights of the Committee, without further consideration or action. Any discretionary authority retained by the Committee pursuant to the terms of this Plan or pursuant to an Award Agreement shall not be applicable to an Award which is determined to constitute Deferred Compensation, if such discretionary authority would contravene Code Section 409A. Unless otherwise provided in a valid election form intended to comply with Code Section 409A, all Awards that are considered Deferred Compensation hereunder shall settle and be paid in no event later

than 2½ months following the end of the calendar year with respect to which the Award’s substantial risk of forfeiture lapsed.

Section 2.7. Effect of Termination of Service on Awards. The Committee shall establish the effect of a Termination of Service on the continuation of rights and benefits available under an Award and, in so doing, may make distinctions based upon, among other things, the reason(s) for the Termination of Service and type of Award. Unless otherwise specified by the Committee and set forth in an Award Agreement or as set forth in any employment or severance agreement entered into by and between the Company and/or a Subsidiary and the Participant, the following provisions shall apply to each Award granted under this Plan:

(a) Upon the Participant’s Termination of Service for any reason other than due to Retirement, Disability, death or Cause, Stock Options shall be exercisable only as to those shares that were immediately exercisable by the Participant at the date of termination, and, except as provided for in the next sentence, may be exercised only for a period of three (3) months following termination and any Restricted Stock or Restricted Stock Units that have not vested as of the date of Termination of Service shall expire and be forfeited. In the event of Termination of Service due to Retirement, a Participant’s vested Stock Options shall be exercisable for one year following Termination of Service, provided that no Stock Option shall be eligible for treatment as an ISO in the event such Stock Option is exercised more than three months following Termination of Service due to Retirement.

(b) In the event of a Termination of Service for Cause, all Stock Options granted to a Participant that have not been exercised (whether or not vested), and all Restricted Stock Awards and Restricted Stock Units that have not vested, shall expire and be forfeited.

(c) Upon Termination of Service on account of Disability or death, all Stock Options shall be fully exercisable, whether or not then exercisable, and all Restricted Stock Awards and Restricted Stock Units shall immediately vest as to all shares subject to an outstanding Award at the date of Termination of Service. Upon Termination of Service for reasons of death or Disability, any Awards that vest based on the achievement of performance targets shall vest based on achievement at target (or if actual achievement of the performance measures is greater than the target level, at the actual achievement level) as of the date of Disability or death. Stock Options may be exercised for a period of one year following Termination of Service due to death or Disability, or the remaining unexpired term of the Stock Option, if less, provided, however, in order to obtain ISO treatment for Stock Options exercised by heirs or devisees of an optionee, the optionee’s death must have occurred while employed or within three (3) months after Termination of Service. In the event of Termination of Service due to Retirement, any Stock Option, Restricted Stock Award or Restricted Stock Unit that has not vested as of the date of Termination of Service due to Retirement shall expire and be forfeited.

(d) Notwithstanding anything herein to the contrary, no Stock Option shall be exercisable beyond the last day of the original term of the Stock Option.

(e) Notwithstanding the provisions of this Section 2.7, the effect of a Change in Control on the vesting/exercisability of Stock Options, Restricted Stock Awards, Restricted Stock Units and Performance Awards is as set forth in Article 4.

Section 2.8. Holding Period for Vested Awards. As a condition of receipt of an Award, the Award Agreement may require a Participant to agree to hold a vested Award or shares of Stock received upon exercise of a Stock Option for a period of time specified in the Award Agreement (“Holding Period”). In connection with the foregoing, a Participant may be required to retain direct ownership of such shares until the earlier of (i) the expiration of the Holding Period following the date of vesting or (ii) such person’s termination of Service with the Company and any Subsidiary. The foregoing limitation, if applicable, shall not apply to the extent that an Award vests due to death, Disability or an Involuntary Termination at or following a Change in Control, or to the extent that (x) a Participant directs the Company to withhold or the Company elects to withhold shares of Stock with respect to the vesting or exercise, or, in lieu thereof, to retain, or to sell without notice, a sufficient number of shares of Stock to cover the amount required to be withheld or (y) a Participant exercises a Stock Option by a net settlement, and in the case of (x) and (y) herein, only to the extent the shares are withheld for tax purposes or for purposes of the net settlement.

ARTICLE 3 - Shares Subject to Plan

Section 3.1 Available Shares. The shares of Stock with respect to which Awards may be made under the Plan shall be shares currently authorized but unissued, currently held or, to the extent permitted by applicable law, subsequently acquired by the Company, including shares purchased in the open market or in private transactions.

Section 3.2 Share Limitations.

(a) Share Reserve. Subject to the following provisions of this Section 3.2, the maximum number of shares of Stock that may be delivered to Participants and their beneficiaries under the Plan shall be equal to 2,810,675 shares of Stock. The maximum number of shares of Stock that may be delivered pursuant to the exercise of Stock Options (all of which may be granted as ISOs) is 2,007,625 shares of Stock, which represents 10.0% of the number of shares sold by the Company and contributed to the Avidia Bank Charitable Foundation, Inc. in connection with the mutual-to-stock conversion of Assabet Valley Bancorp (the “Conversion”). The maximum number of shares of Stock that may be issued as Restricted Stock Awards and Restricted Stock Units is 803,050 shares of Stock, which represents 4.0% of the number of shares issued in connection with the Conversion. The aggregate number of shares available for grant under this Plan and the number of shares of Stock subject to outstanding awards shall be subject to adjustment as provided in Section 3.4.

(b) Computation of Shares Available. For purposes of this Section 3.2 and in connection with the granting of a Stock Option, Restricted Stock or Restricted Stock Unit, the number of shares of Stock available for the grant of Awards shall be reduced by the number of shares previously granted, subject to the following. To the extent any shares of Stock covered by an Award (including Restricted Stock Awards and Restricted Stock Units) under the Plan are not delivered to a Participant or beneficiary for any reason, including because the Award is forfeited or canceled or because a Stock Option is not exercised, then the shares shall not be deemed to have been delivered for purposes of determining the maximum number of shares of Stock available for delivery under the Plan. To the extent that: (i) a Stock Option is exercised by using an actual or constructive exchange of shares of Stock to pay the Exercise Price; (ii) shares of Stock are withheld to satisfy tax withholding upon exercise or vesting of an Award granted hereunder; or (iii) shares are withheld to satisfy the Exercise Price of Stock Options in a net settlement of Stock Options, then the number of shares of Stock available shall be reduced by the gross number of Stock Options exercised or Stock vested prior to the return of shares to satisfy tax withholding, rather than by the net number of shares of Stock issued.

Section 3.3 Limitations on Grants to Employees and Directors.

(b) Initial Grant to Non-Employee Directors. Each non-Employee Director of the Board of Directors of the Company who is in the Service of the Company on the Effective Date (i.e., the date of the 2026 Company annual shareholder meeting at which shareholders approve the Plan (“2026 Annual Meeting”) shall automatically be granted an Award of Stock Options and Restricted Stock as follows:

(i) Stock Options – Non-Employee Directors. Each non-Employee Director of the Board of Directors of the Company who is in the Service of the Company immediately following the 2026 Annual Meeting, shall receive, on the day immediately following the Effective Date, a grant of 50,190 Stock Options. These grants will vest at the rate of 20% per year, subject to acceleration in the event of death, Disability or an Involuntary Termination at or following a Change in Control.

(ii) Restricted Stock Awards – Non-Employee Directors. Each non-Employee Director of the Board of Directors of the Company who is in the Service of the Company immediately following the 20265 Annual Meeting shall receive, on the day immediately following the Effective Date, a grant of 20,076 shares of Restricted Stock. These grants will vest at the rate of 20% per year, subject to acceleration in the event of death, Disability or an Involuntary Termination at or following a Change in Control.

(c) Awards Subject to Adjustment. The aggregate number of shares available for grant under this Plan and the number of shares subject to outstanding Awards, including the limit on the number of Awards available for grant under this Plan described in this Section 3.3, shall be subject to adjustment as provided in Section 3.4.

Section 3.4 Corporate Transactions.

(a) General. If the shares of Stock are changed into or exchanged for a different number or kind of shares or other securities of the Company on account of any recapitalization, reclassification, stock split, reverse split, combination of shares, exchange of shares, stock dividend or other distribution payable in capital stock, or other increase or decrease in such shares effected without receipt of consideration by the Company occurring after the Effective Date, the number and kinds of shares for which grants of Stock Options, Restricted Stock and Restricted Stock Unit Awards may be made under the Plan shall be adjusted proportionately and accordingly by the Committee, so that the proportionate interest of the grantee immediately following such event shall, to the extent practicable, be the same as immediately before such event. Any such adjustment in outstanding Stock Options shall not change the aggregate purchase price payable with respect to shares that are subject to the unexercised portion of the Stock Option outstanding but shall include a corresponding proportionate adjustment in the purchase price per share. In addition, the Committee is authorized to make adjustments in the terms and conditions of, and the criteria included in, Stock Options, Restricted Stock Awards and Restricted Stock Units (including, without limitation, cancellation of Stock Options, Restricted Stock Awards and Restricted Stock Units in exchange for the in-the-money value, if any, of the vested portion thereof, or substitution or exchange of Stock Options, Restricted Stock Awards and Restricted Stock Units using stock of a successor or other entity) in recognition of unusual or nonrecurring events (including, without limitation, events described in the preceding sentence) affecting the Company or any parent or Subsidiary or the financial statements of the Company or any parent or Subsidiary, or in response to changes in applicable laws, regulations, or accounting principles.

(b) Merger in which Company is Not Surviving Entity. In the event of any merger, consolidation, or other business reorganization (including, but not limited to, a Change in Control) in which the Company is not the surviving entity, unless otherwise set forth in the agreement relating to the consummation of such merger, consolidation or other business reorganization, any Stock Options granted under the Plan which are outstanding immediately prior to such merger, consolidation or other business combination shall be converted into Stock Options to purchase voting common equity securities of the business entity which survives such merger, consolidation or other business reorganization having substantially the same terms and conditions as the outstanding Stock Options under this Plan and reflecting the same economic benefit (as measured by the difference between the aggregate Exercise Price and the value exchanged for outstanding shares of Stock in such merger, consolidation or other business reorganization), all as determined by the Committee prior to the consummation of such merger. The Committee may, at any time prior to the consummation of such merger, consolidation or other business reorganization, direct that all, but not less than all, outstanding Stock Options be canceled as of the effective date of such merger, consolidation or other business reorganization in exchange for a cash (or acquiror stock) payment per share of Stock equal to the excess (if any) of the value exchanged for an outstanding share of Stock in such merger, consolidation or other business reorganization over the Exercise Price of the Stock Option being canceled; provided, further, that in the event the Exercise Price of outstanding Stock Options exceed the value to be exchanged for an outstanding share of Stock (an “Underwater Stock Option”) in such merger, consolidation or other business reorganization, the Committee may, in its discretion, cancel and terminate such Underwater Stock Options without the consent of the holder of the Stock Option and without any payment to such holder.

Section 3.5 Delivery of Shares. Delivery of shares of Stock or other amounts under the Plan shall be subject to the following:

(a) Compliance with Applicable Laws. Notwithstanding any other provision of the Plan, the Company shall have no obligation to deliver any shares of Stock or make any other distribution of benefits under the

Plan unless such delivery or distribution complies with all applicable laws (including, the requirements of the Securities Act), and the applicable requirements of any Exchange or similar entity.

(b) Certificates. To the extent that the Plan provides for the issuance of shares of Stock, the issuance may be made on a non-certificated basis, to the extent not prohibited by applicable law or the applicable rules of any Exchange.

ARTICLE 4 - CHANGE IN CONTROL

Section 4.1 Consequence of a Change in Control. Subject to the provisions of Section 3.4 (relating to the adjustment of shares and cancellation of Stock Options in exchange for a cash or stock payment of the in-the-money value) and except as otherwise provided in the Plan and unless the Committee determines otherwise:

(a) Upon an Involuntary Termination at or following a Change in Control, all Stock Options then held by the Participant shall become fully earned and exercisable (subject to the expiration provisions otherwise applicable to the Stock Option). All Stock Options may be exercised for a period of one year following an Involuntary Termination at or following a Change in Control, provided, however, that no Stock Option shall be eligible for treatment as an ISO in the event such Stock Option is exercised more than three (3) months following a termination of employment.

(b) Upon an Involuntary Termination at or following a Change in Control, all Awards of Restricted Stock Awards and Restricted Stock Units, shall be fully earned and vested immediately.

(c) Upon an Involuntary Termination at or following a Change in Control, all Performance Awards shall vest at the greater of the target level of performance or actual annualized performance measured as of the most recent completed fiscal quarter.

(d) Notwithstanding anything in the Plan to the contrary, in the event of a Change in Control in which the Company is not the surviving entity, any Awards granted under the Plan which are outstanding immediately prior to such Change in Control shall become fully vested in the event the successor entity does not assume the Awards granted under the Plan and Performance Awards shall vest at the rate specified in Section 4.1(c) of the Plan.

Section 4.2 Definition of Change in Control. For purposes of the Plan, unless otherwise provided in an Award Agreement, a “Change in Control” shall be deemed to have occurred upon the earliest to occur of the following:

(a) any “person,” as such term is used in Sections 13(d) and 14(d) of the Exchange Act (a “Person”), is or becomes the “beneficial owner” (as defined in Rule 13d-3 under the Exchange Act), directly or indirectly, of securities of the Company representing twenty five percent (25%) or more of the combined voting power of the Company’s then outstanding Voting Securities, provided that, notwithstanding the foregoing and for all purposes of this Plan: (a) the term “Person” shall not include (1) the Company or any of its Subsidiaries, (2) an employee benefit plan of the Company or any of its Subsidiaries (including the Plan), and any trustee or other fiduciary holding securities under any such plan, or (3) a corporation or other entity owned, directly or indirectly, by the shareholders of the Company in substantially the same proportions as their ownership of Stock of the Company; (b) no Person shall be deemed the beneficial owner of any securities acquired by such Person in an Excluded Transaction; and (c) no Director or officer of the Company or any direct or indirect Subsidiary of the Company (or any affiliate of any such Director or officer) shall, by reason of any or all of such Directors or officers acting in their capacities as such, be deemed to beneficially own any securities beneficially owned by any other such Director or officer (or any affiliate thereof); or

(b) the Incumbent Directors cease, for any reason, to constitute a majority of the Whole Board; or

(c) a plan of reorganization, merger, consolidation or similar transaction involving the Company and one or more other corporations or entities is consummated, other than a plan of reorganization, merger, consolidation or similar transaction that is an Excluded Transaction, or the shareholders of the Company approve a

plan of complete liquidation of the Company, or a sale, liquidation or other disposition of all or substantially all of the assets of the Company or any bank Subsidiary of the Company is consummated; or

(d) a tender offer is made for 25% or more of the outstanding Voting Securities of the Company and the shareholders owning beneficially or of record 25% or more of the outstanding Voting Securities of the Company have tendered or offered to sell their shares pursuant to such tender offer and such tendered shares have been accepted by the tender offeror and the tender offer is consummated.

Notwithstanding the foregoing, a Change in Control shall not be deemed to occur solely because any Person (the “Subject Person”) acquired beneficial ownership of more than the permitted amount of the then outstanding common stock or Voting Securities as a result of the acquisition of Stock or Voting Securities by the Company, which by reducing the number of shares of Stock or Voting Securities then outstanding, increases the proportional number of shares beneficially owned by the Subject Person; provided, however, that if a Change in Control would occur (but for the operation of this sentence) as a result of the acquisition of shares of Stock or Voting Securities by the Company, and after such share acquisition by the Company, the Subject Person becomes the beneficial owner of any additional Stock or Voting Securities which increases the percentage of the then outstanding Stock or Voting Securities Beneficially Owned by the Subject Person, then a Change in Control shall occur. In the event that an Award constitutes Deferred Compensation, and the settlement of, or distribution of benefits under, such Award is to be triggered solely by a Change in Control, then with respect to such Award a Change in Control shall be defined as required under Code Section 409A, as in effect at the time of such transaction.

ARTICLE 5 - COMMITTEE

Section 5.1 Administration. The Plan shall be administered by the Compensation Committee of the Board of Directors or such other committee or subcommittee of the Board of Directors as may be duly appointed to administer the Plan, and having such powers in each instance as shall be specified by the Board of Directors. To the extent required by applicable laws, the Committee shall consist of two or more members of the Board of Directors, each of whom is a “non-employee director” within the meaning of Rule 16b-3 promulgated under the Exchange Act and an “independent director” within the meaning of applicable rules of any securities exchange upon which Shares are listed. The Board of Directors (or if necessary to maintain compliance with the applicable listing standards, those members of the Board of Directors who are “independent directors” under the corporate governance statutes or rules of any Exchange on which the Company lists, or has listed or seeks to list its securities) may, in their discretion, take any action and exercise any power, privilege or discretion conferred on the Committee under the Plan with the same force and effect under the Plan as if done or exercised by the Committee.

Section 5.2 Powers of Committee. The Committee’s administration of the Plan shall be subject to the following:

(a) The Committee will have the authority and discretion to select from among the Company’s and its Subsidiaries’ Employees, Directors and service providers those persons who shall receive Awards, to determine the time or times of receipt, to determine the types of Awards and the number of shares covered by the Awards, to establish the terms, conditions, features, (including automatic exercise in accordance with Section 7.18) performance criteria, restrictions (including without limitation, provisions relating to non-competition, non-solicitation and confidentiality), and other provisions of such Awards, to cancel or suspend Awards (subject to the restrictions imposed by Article 6) and to reduce, eliminate or accelerate any restrictions applicable to an Award at any time after the grant of the Award, or to extend the time period to exercise a Stock Option, provided that such extension is consistent with Code Section 409A. Notwithstanding the foregoing, the Committee will not have the authority or discretion to accelerate the vesting requirements applicable to an Award to avoid the one-year minimum vesting requirement pursuant to Section 2.5 except in the event of a Change in Control as provided under Section 4.1 of the Plan and in the event of termination due to death or Disability.

(b) The Committee will have the authority and discretion to interpret the Plan, to establish, amend and rescind any rules and regulations relating to the Plan, and to make all other determinations that may be necessary or advisable for the administration of the Plan.

(c) The Committee will have the authority to define terms not otherwise defined herein.

(d) In controlling and managing the operation and administration of the Plan, the Committee shall take action in a manner that conforms to the certificate of incorporation and bylaws of the Company and applicable state corporate law.

(e) The Committee will have the authority to: (i) suspend a Participant’s right to exercise a Stock Option during a blackout period (or similar restricted period) or to exercise in a particular manner (i.e., such as a “cashless exercise” or “broker-assisted exercise”) to the extent that the Committee deems it necessary or in the best interests of the Company in order to comply with the securities laws and regulations issued by the SEC; and (ii) to extend the period to exercise a Stock Option by a period of time equal to the blackout period, provided that the extension does not violate Section 409A of the Code, the Incentive Stock Option requirements or applicable laws and regulations.

Section 5.3 Delegation by Committee. Except to the extent prohibited by applicable law, the applicable rules of an Exchange upon which the Company lists its shares or the Plan, or as necessary to comply with the exemptive provisions of Rule 16b-3 promulgated under the Exchange Act, the Committee may allocate all or any portion of its responsibilities and powers to any one or more of its members and may delegate all or any part of its responsibilities and powers to any person or persons selected by it, including (a) delegating to a committee of one or more members of the Board of Directors who are not “independent directors,” the authority to grant Awards under the Plan to eligible persons who are not then subject to Section 16 of the Exchange Act; or (b) delegating to a committee of one or more members of the Board of Directors who would be eligible to serve on the Compensation Committee of the Company pursuant to the listing requirements imposed by any national securities Exchange on which the Company lists, has listed or seeks to list its securities, the authority to grant awards under the Plan. The acts of such delegates shall be treated hereunder as acts of the Committee and such delegates shall report regularly to the Committee regarding the delegated duties and responsibilities and any Awards so granted. Any such allocation or delegation may be revoked by the Committee at any time.

Section 5.4 Information to be Furnished to Committee. As may be permitted by applicable law, the Company and its Subsidiaries shall furnish the Committee with data and information it determines may be required for it to discharge its duties. The records of the Company and its Subsidiaries as to a Participant’s employment, termination of employment, leave of absence, reemployment and compensation shall be conclusive on all persons unless determined by the Committee to be manifestly incorrect. Subject to applicable law, Participants and other persons entitled to benefits under the Plan must furnish the Committee any evidence, data or information as the Committee considers desirable to carry out the terms of the Plan.

Section 5.5 Committee Action. Unless otherwise performed by the Board of Directors, the Committee shall hold meetings, and may make administrative rules and regulations, as it may deem proper. A majority of the members of the Committee shall constitute a quorum, and the action of a majority of the members of the Committee present at a meeting at which a quorum is present, as well as actions taken pursuant to the unanimous written consent of all of the members of the Committee without holding a meeting, shall be deemed to be actions of the Committee. Subject to Section 5.1, all actions of the Committee, including interpretations of provisions of the Plan, shall be final and conclusive and shall be binding upon the Company, Participants and all other interested parties. Any person dealing with the Committee shall be fully protected in relying upon any written notice, instruction, direction or other communication signed by a member of the Committee or by a representative of the Committee authorized to sign the same in its behalf.

ARTICLE 6 - AMENDMENT AND TERMINATION

Section 6.1 General. The Board of Directors may, as permitted by law, at any time, amend or terminate the Plan, and the Board of Directors or the Committee may, at any time, amend any Award Agreement, provided that no amendment or termination (except as provided in Section 2.6, Section 3.4 and Section 6.2) may cause the Award to violate Code Section 409A, may cause the repricing of a Stock Option, or, in the absence of written consent to the change by the affected Participant (or, if the Participant is not then living, the affected beneficiary), adversely impair the rights of any Participant or beneficiary under any Award granted under the Plan before the date the amendment is adopted by the Board of Directors or made by the Committee; provided, however,

that, no amendment may (a) materially increase the benefits accruing to Participants under the Plan; (b) materially increase the aggregate number of securities that may be issued under the Plan, other than pursuant to Section 3.4, or (c) materially modify the requirements for participation in the Plan, unless the amendment under (a), (b) or (c) above is approved by the Company’s shareholders.

Section 6.2 Amendment to Conform to Law and Accounting Changes. Notwithstanding any provision in this Plan or any Award Agreement to the contrary, the Committee may amend the Plan or any Award Agreement, to take effect retroactively or otherwise, as deemed necessary or advisable for the purpose of (i) conforming the Plan or the Award Agreement to any present or future law relating to plans of this or similar nature (including, but not limited to, Code Section 409A), or (ii) avoiding an accounting treatment resulting from an accounting pronouncement or interpretation thereof issued by the SEC or Financial Accounting Standards Board subsequent to the adoption of the Plan or the making of the Award affected thereby, which in the sole discretion of the Committee, may materially and adversely affect the financial condition or results of operations of the Company. By accepting an Award under this Plan, each Participant agrees and consents to any amendment made pursuant to this Section 6.2 to any Award granted under the Plan without further consideration or action.

ARTICLE 7 - GENERAL TERMS

Section 7.1 No Implied Rights.

(a) No Rights to Specific Assets. Neither a Participant nor any other person shall by reason of participation in the Plan acquire any right in or title to any assets, funds or property of the Company or any Subsidiary whatsoever, including any specific funds, assets, or other property which the Company or any Subsidiary, in its sole discretion, may set aside in anticipation of a liability under the Plan. A Participant shall have only a contractual right, evidenced by an Award Agreement, to the shares of Stock or amounts, if any, payable or distributable under the Plan, unsecured by any assets of the Company or any Subsidiary, and nothing contained in the Plan shall constitute a guarantee that the assets of the Company or any Subsidiary shall be sufficient to pay any benefits to any person.

(b) No Contractual Right to Employment or Future Awards. The Plan does not constitute a contract of employment, and selection as a Participant will not give any participating Employee the right to be retained in the employ of the Company or any Subsidiary or any right or claim to any benefit under the Plan, unless the right or claim has specifically accrued under the terms of the Plan. No individual shall have the right to be selected to receive an Award under the Plan, or, having been so selected, to receive a future Award under the Plan.

(c) No Rights as a Shareholder. Except as otherwise provided in the Plan or in an Award Agreement, no Award shall confer upon the holder thereof any rights as a shareholder of the Company before the date on which the individual fulfills all conditions for receipt of such rights.

Section 7.2 Transferability. Except as otherwise so provided by the Committee, Stock Options under the Plan are not transferable except: (i) as designated by the Participant by will or by the laws of descent and distribution; (ii) to a trust established by the Participant, if under Code Section 671 and applicable state law, the Participant is considered the sole beneficial owner of the Stock Option while held in trust, or (iii) between spouses incident to a divorce or pursuant to a domestic relations order, provided, however, in the case of a transfer within the meaning of this Section 7.2(iii), the Stock Option shall not qualify as an ISO as of the day of the transfer. The Committee shall have the discretion to permit the transfer of vested Stock Options (other than ISOs) under the Plan; provided, however, that such transfers shall be limited to Immediate Family Members of Participants, trusts and partnerships established for the primary benefit of Immediate Family Members or to charitable organizations, and; provided, further, that the transfers are not made for consideration to the Participant.

Awards of Restricted Stock shall not be transferable, except in the event of death, before the time that the Awards vest in the Participant. A Restricted Stock Unit Award is not transferable, except in the event of death, before the time that the Restricted Stock Unit Award vests in the Participant and property in which the Restricted Stock Unit is denominated is distributed to the Participant or the Participant’s beneficiary.

A beneficiary, transferee, or other person claiming any rights under the Plan from or through any Participant shall be subject to all terms and conditions of the Plan and any Award Agreement applicable to the Participant, except as otherwise determined by the Committee, and to any additional terms and conditions deemed necessary or appropriate by the Committee.

Section 7.3 Designation of Beneficiaries. A Participant may file with the Company a written designation of a beneficiary or beneficiaries under this Plan and may from time to time revoke or amend the designation. Any designation of beneficiary under this Plan shall be controlling over any other disposition, testamentary or otherwise (unless such disposition is pursuant to a domestic relations order); provided, however, that if the Committee is in doubt as to the entitlement of the beneficiary to any Award, the Committee may determine to recognize only the legal representative of the Participant in which case the Company, the Committee and the members thereof shall not be under any further liability to anyone.

Section 7.4 Non-Exclusivity. Neither the adoption of this Plan by the Board of Directors nor the submission of the Plan to the shareholders of the Company for approval (and any subsequent approval by the shareholders of the Company) shall be construed as creating any limitations on the power of the Board of Directors or the Committee to adopt other incentive arrangements as may be deemed desirable, including, without limitation, the granting of Restricted Stock Awards, Restricted Stock Units and/or Stock Options otherwise than under the Plan, and such arrangements may be either generally applicable or applicable only in specific cases.

Section 7.5 Award Agreement. Each Award granted under the Plan shall be evidenced by an Award Agreement. A copy of the Award Agreement, in any medium chosen by the Committee, shall be provided (or made available electronically) to the Participant, and the Committee may, but need not, require that the Participant sign a copy of the Award Agreement. In the absence of a specific provision in the Award Agreement, the terms of the Plan shall control. In the event of a conflict between the terms of an Award Agreement and the Plan, the terms of the Plan will control.

Section 7.6 Form and Time of Elections; Notification Under Code Section 83(b). Unless otherwise specified herein, each election required or permitted to be made by any Participant or other person entitled to benefits under the Plan, and any permitted modification, or revocation thereof, shall be filed with the Company at such times, in such form, and subject to such restrictions and limitations, not inconsistent with the terms of the Plan, as the Committee shall require. Notwithstanding anything herein to the contrary, the Committee may, on the date of grant or at a later date, as applicable, prohibit an individual from making an election under Code Section 83(b). If the Committee has not prohibited an individual from making this election, an individual who makes this election shall notify the Committee of the election within ten (10) days of filing notice of the election with the Internal Revenue Service or as otherwise required by the Committee. This requirement is in addition to any filing and notification required under the regulations issued under the authority of Code Section 83(b).

Section 7.7 Evidence. Evidence required of anyone under the Plan may be by certificate, affidavit, document or other written information upon which the person is acting considers pertinent and reliable, and signed, made or presented by the proper party or parties.

Section 7.8 Tax Withholding.

(a) Payment by Participant. Each Participant shall, no later than the date as of which the value of an Award or of any Stock or other amounts received thereunder first becomes includable in the gross income of the Participant for Federal income tax purposes, pay to the Company, or make arrangements satisfactory to the Committee regarding payment of, any Federal, state, or local taxes of any kind required by law to be withheld by the Company with respect to such income. The Company and its Subsidiaries shall, to the extent permitted by law, have the right to deduct any taxes from any payment of any kind otherwise due to the Participant. The Company's obligation to deliver evidence of book entry (or stock certificates) to any Participant is subject to and conditioned on tax withholding obligations being satisfied by the Participant.

(b) Payment in Stock. The Committee may require or permit the Company's tax withholding obligation to be satisfied, in whole or in part, by the Company withholding from shares of Stock to be issued pursuant to any

Award a number of shares with an aggregate Fair Market Value (as of the date the withholding is effected) that would satisfy the withholding amount due; provided, however, that the amount withheld does not exceed the maximum statutory tax rate or such lesser amount as is necessary to avoid liability accounting treatment. For purposes of share withholding, the Fair Market Value of withheld shares shall be determined in the same manner as the value of Stock includible in income of the Participants.

Section 7.9 Action by Company or Subsidiary. Any action required or permitted to be taken by the Company or any Subsidiary shall be by resolution or unanimous written consent of its board of directors, or by action of one or more members of the board of directors (including a committee of the board of directors) who are duly authorized to act for the board of directors, or (except to the extent prohibited by applicable law or applicable rules of the Exchange on which the Company lists its securities) by a duly authorized officer of the Company or Subsidiary.

Section 7.10 Successors. All obligations of the Company under this Plan shall be binding upon and inure to the benefit of 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 business, stock, and/or assets of the Company.

Section 7.11 Indemnification. Except as provided in the last sentence of this Section 7.11, to the fullest extent permitted by law and the Company’s governing documents, each person who is or shall have been a member of the Committee, or of the Board of Directors, or an officer or Employee of the Company or a Subsidiary to whom authority was delegated in accordance with Section 5.3, shall be indemnified and held harmless by the Company (i) against and from any loss (including amounts paid in settlement), cost, liability or expense (including reasonable attorneys’ fees) that may be imposed upon or reasonably incurred by him or her in connection with or resulting from any claim, action, suit, or proceeding to which he or she may be a party or in which he or she may be involved by reason of any action taken or failure to act under the Plan; and (ii) against and from any and all amounts paid by him or her in settlement thereof, with the Company’s approval, or paid by him or her in satisfaction of any judgment in any such action, suit, or proceeding against him or her, provided he or she shall give the Company an opportunity, at its own expense, to handle and defend the same before he or she undertakes to handle and defend it on his or her own behalf, unless such loss, cost, liability, or expense is a result of his or her own willful misconduct or except as expressly provided by statute or regulation. The foregoing right of indemnification shall not be exclusive of any other rights of indemnification to which such persons may be entitled under the Company’s charter or bylaws, as a matter of law, or otherwise, or any power that the Company may have to indemnify them or hold them harmless. The foregoing right to indemnification shall include the right to be paid by the Company the expenses incurred in defending any such proceeding in advance of its final disposition, provided, however, that, if required by applicable law, an advancement of expenses shall be made only upon delivery to the Company of an undertaking by or on behalf of such persons to repay all amounts so advanced if it shall ultimately be determined by final judicial decision from which there is no further right to appeal that such person is not entitled to be indemnified for such expenses. Notwithstanding anything to the contrary in this Plan, the foregoing right to indemnification shall not apply to any compensation that an Employee is required to repay the Company pursuant to the terms of a Company clawback policy.

Section 7.12 No Fractional Shares. Unless otherwise permitted by the Committee, no fractional shares of Stock shall be issued or delivered pursuant to the Plan or any Award Agreement. The Committee shall determine whether cash or other property shall be issued or paid in lieu of fractional shares or whether the fractional shares or any rights thereto shall be forfeited or otherwise eliminated by rounding down.

Section 7.13 Governing Law. The Plan, all awards granted hereunder, and all actions taken in connection herewith shall be governed by and construed in accordance with the laws of the Commonwealth of Massachusetts, without reference to principles of conflict of laws, except as superseded by applicable federal law. The federal and state courts located in the Commonwealth of Massachusetts shall have exclusive jurisdiction over any claim, action, complaint or lawsuit brought under the terms of the Plan. By accepting any Award, each Participant, and any other person claiming any rights under the Plan, agrees to submit himself or herself, and any legal action brought with respect to the Plan, to the sole jurisdiction of such courts for the adjudication and resolution of any such disputes.

Section 7.14 Benefits Under Other Plans. Except as otherwise provided by the Committee or as set forth in a Qualified Retirement Plan, non-qualified plan or other benefit plan, Awards to a Participant (including the grant and the receipt of benefits) under the Plan shall be disregarded for purposes of determining the Participant’s benefits under, or contributions to, any Qualified Retirement Plan, non-qualified plan and any other benefit plans maintained by the Participant’s employer. The term “Qualified Retirement Plan” means any plan of the Company or a Subsidiary that is intended to be qualified under Code Section 401(a).

Section 7.15 Validity. If any provision of this Plan is determined to be illegal or invalid for any reason, said illegality or invalidity shall not affect the remaining parts hereof, but this Plan shall be construed and enforced as if such illegal or invalid provision had never been included in the Plan.

Section 7.16 Notice. Unless otherwise provided in an Award Agreement, all written notices and all other written communications to the Company provided for in the Plan or an Award Agreement shall be delivered personally or sent by registered or certified mail, return receipt requested, postage prepaid (provided that international mail shall be sent via overnight or two-day delivery), or sent by facsimile, email or prepaid overnight courier to the Company at its principal executive office. Notices, demands, claims and other communications shall be deemed given: (i) in the case of delivery by overnight service with guaranteed next day delivery, the next day or the day designated for delivery; (ii) in the case of certified or registered U.S. mail, five (5) days after deposit in the U.S. mail; or (iii) in the case of facsimile or email, the date upon which the transmitting party received confirmation of receipt; provided, however, that in no event shall any such communications be deemed to be given later than the date they are actually received, provided they are actually received.

If a communication is not received, it shall only be deemed received upon the showing of an original of the applicable receipt, registration or confirmation from the applicable delivery service. Communications that are to be delivered by U.S. mail or by overnight service to the Company shall be directed to the attention of the Company’s Chief Executive Officer and to the Corporate Secretary, unless otherwise provided in the Participant’s Award Agreement.

Section 7.17 Forfeiture Events. The Committee may specify in an Award Agreement that the Participant’s rights, payments, and benefits with respect to an Award shall be subject to reduction, cancellation, forfeiture or recoupment upon the occurrence of certain specified events, in addition to any otherwise applicable vesting or performance conditions of an Award. These events include, but are not limited to, termination of employment for Cause, termination of the Participant’s provision of Services to the Company or any Subsidiary, violation of material Company or Subsidiary policies, breach of noncompetition, confidentiality, or other restrictive covenants that may apply to the Participant, or other conduct of the Participant that is detrimental to the business or reputation of the Company or any Subsidiary.

Section 7.18 Automatic Exercise. In the sole discretion of the Committee exercised in accordance with Section 5.2(a), any Stock Options that are exercisable but unexercised as of the day immediately before the expiration date of the Stock Option may be automatically exercised in accordance with procedures established for this purpose by the Committee, but only if the Exercise Price is less than the Fair Market Value of a share of Stock on such date and the automatic exercise will result in the issuance of at least one (1) whole share of Stock to the Participant after payment of the Exercise Price and any applicable tax withholding requirements. Payment of the exercise price and any applicable tax withholding requirements shall be made by a net settlement of the Stock Option whereby the number of shares of Stock to be issued upon exercise are reduced by a number of shares having a Fair Market Value on the date of exercise equal to the Exercise Price and any applicable tax withholding.

Section 7.19 Regulatory Requirements. The grant and settlement of Awards under this Plan shall be conditioned upon and subject to compliance with Section 18(k) of the Federal Deposit Insurance Act, 12 U.S.C. 1828(k), and the rules and regulations promulgated thereunder.

Section 7.20. Awards Subject to Company Clawback Policies and Restrictions.

Clawback Policies. Awards granted hereunder are subject to any clawback policy that may be adopted by the Company from time to time, including the Company’s current clawback policy and pursuant to the provisions of Section 954 of the Dodd-Frank Act, implementing regulations thereunder, or otherwise.

Trading Policy Restrictions. Option exercises and other Awards under the Plan shall be subject to the Company’s insider trading policies and procedures, as in effect from time to time.

Hedging/Pledging Policy Restrictions. Awards under the Plan shall be subject to the Company’s policies relating to hedging and pledging as such may be in effect from time to time.

ARTICLE 8 - DEFINED TERMS; CONSTRUCTION

Section 8.1 In addition to the other definitions contained herein, unless otherwise specifically provided in an Award Agreement, the following definitions shall apply:

“10% Stockholder” means an individual who, at the time of grant, owns stock possessing more than ten percent (10%) of the total combined voting power of all classes of stock of the Company.

“Award” means any Stock Option, Restricted Stock Award or Restricted Stock Unit or any other right or interest relating to Stock or cash, granted to a Participant under the Plan.

“Award Agreement” means the document (in whatever medium prescribed by the Committee and whether or not a signature is required or provided by a Participant) that evidences the terms and conditions of an Award. A copy of the Award Agreement will be provided (or made available electronically) to each Participant.

“Board of Directors” means the Board of Directors of the Company.

“Cause” If the Participant is subject to a written employment agreement (or other similar written agreement) with the Company or a Subsidiary that provides a definition of termination for “cause,” then, for purposes of this Plan, the term “Cause” shall have the meaning set forth in such agreement. In the absence of such a definition, “Cause” means termination because of (i) Participant’s conviction (including conviction on a nolo contendere plea) of a felony or of any lesser criminal offense involving moral turpitude, fraud or dishonesty; (ii) the willful commission by Participant of a criminal or other act that, in the reasonable judgment of the Board of Directors will likely cause substantial economic damage to the Company or the Bank or substantial injury to the business reputation of the Company or Bank; (iii) the commission by Participant of an act of fraud in the performance of his duties on behalf of the Company or Bank; (iv) Participant’s material violation of the Bank’s code of ethics; (v) the continuing willful failure of Participant to perform his employment duties to the Company or Bank after thirty (30) days’ written notice thereof (specifying the particulars thereof in reasonable detail) and a reasonable opportunity to be heard and cure such failure are given to Participant by the Board of Directors; (vi) willful failure to cooperate with a bona fide internal investigation or an investigation by regulatory or law enforcement authorities, after being instructed by the Company or a Subsidiary to cooperate, or the deliberate destruction of or deliberate failure to preserve documents or other materials that the Participant should reasonably know to be relevant to such investigation, after being instructed by the Company or a Subsidiary to preserve such documents, or the willful inducement of others to fail to cooperate or to fail to produce documents or other materials; or (vii) an order of a federal or state regulatory agency or a court of competent jurisdiction requiring the termination of Participant’s employment by the Company or the Bank.

“Change in Control” has the meaning ascribed to it in Section 4.2.

“Code” means the Internal Revenue Code of 1986, as amended, and any rules, regulations and guidance promulgated thereunder, as modified from time to time.

“Director” means a member of the Board of Directors or of a board of directors of a Subsidiary.

“Disability” If the Participant is subject to a written employment agreement (or other similar written agreement) with the Company or a Subsidiary that provides a definition of “Disability” or “Disabled,” then, for purposes of this Plan, the terms “Disability” or “Disabled” shall have meaning set forth in such agreement. In the absence of such a definition, “Disability” shall be defined in accordance with the Bank’s long-term disability plan. To the extent that an Award hereunder is subject to Code Section 409A, “Disability” or “Disabled” shall mean that a Participant: (i) is unable to engage in any substantial gainful activity by reason of any medically determinable physical or mental impairment which can be expected to result in death or can be expected to last for a continuous period of not less than twelve (12) months; or (ii) is, by reason of any medically determinable physical or mental impairment which can be expected to result in death or can be expected to last for a continuous period of not less than twelve (12) months, receiving income replacement benefits for a period of not less than three (3) months under an accident and health plan covering Employees. Except to the extent prohibited under Code Section 409A, if applicable, the Committee shall have discretion to determine if a Disability has been incurred.

“Dividend Equivalent Right” means the right, associated with a Restricted Stock Unit, to receive a payment, in cash or shares of Stock, as applicable, equal to the amount of dividends paid on a share of Stock, as specified in the Award Agreement.

“Employee” means any person employed by the Company or a Subsidiary, including Directors who are employed by the Company or a Subsidiary.

“Exchange” means any national securities exchange on which the Stock may from time to time be listed or traded.

“Exchange Act” means the Securities Exchange Act of 1934, as amended and the rules, regulations and guidance promulgated thereunder, as modified from time to time.

“Excluded Transaction” means a plan of reorganization, merger, consolidation or similar transaction that would result in the Voting Securities of the Company outstanding immediately prior thereto continuing to represent (either by remaining outstanding or by being converted into Voting Securities of the surviving corporation or any parent thereof) at least 50% of the combined voting power of the Voting Securities of the entity surviving the plan of reorganization, merger, consolidation or similar transaction (or the parent of such surviving entity) immediately after such plan of reorganization, merger, consolidation or similar transaction.

“Exercise Price” means the price established with respect to a Stock Option pursuant to Section 2.2.

“Fair Market Value” on any date, means (i) if the Stock is listed on an Exchange, national market system or automated quotation system, the closing sales price on that Exchange or over such system on that date or, in the absence of reported sales on that date, the closing sales price on the immediately preceding date on which sales were reported, or (ii) if the Stock is not listed on an Exchange, national market system or automated quotation system, “Fair Market Value” shall mean a price determined by the Committee in good faith on the basis of objective criteria consistent with the requirements of Code Section 422 and applicable provisions of Code Section 409A.

“Good Reason” A termination of employment by a Participant shall be deemed a termination of employment for “Good Reason” as a result of the Participant’s resignation from the employ of the Company or any Subsidiary upon the occurrence of any of the following events:

(ii) a material diminution in Participant’s authority, duties or responsibilities without the written consent of Participant;

(iii) a change in the geographic location at which Participant must perform his duties that is more than thirty (30) miles from the location of Participant’s principal workplace on the date immediately prior to a Change in Control.

Notwithstanding the foregoing, in the event a Participant is a party to an Award Agreement, employment or change in control agreement that provides a definition for “Good Reason” or a substantially similar term, then the occurrence of any event set forth in such definition. In the event an Award is subject to Code Section 409A, the term “Good Reason” shall be defined in accordance with Code Section 409A.

Further, the Participant must give written notice to the Company or the Subsidiary for whom the Participant is employed of the Good Reason condition within 60 days of becoming aware (or should have become aware) of the applicable facts and circumstances, the Company or Subsidiary, as applicable, shall have 30 days to cure the Good Reason condition, and the Participant must terminate employment within 30 days after expiration of the opportunity to cure. Any distribution of an Award subject to Code Section 409A shall be subject to the distribution timing rules of Code Section 409A, including any delay in the distribution of such Award, which rules shall be set forth in the Award Agreement.

“Holding Period” has the meaning ascribed to it in Section 2.8.

“Immediate Family Member” means with respect to any Participant: (i) any of the Participant’s children, stepchildren, grandchildren, parents, stepparents, grandparents, spouses, former spouses, siblings, nieces, nephews, mothers-in-law, fathers-in-law, sons-in-law, daughters-in-law, brothers-in-law or sisters-in-law, including relationships created by adoption; (ii) any natural person sharing the Participant’s household (other than as a tenant or employee, directly or indirectly, of the Participant); (iii) a trust in which any combination of the Participant and persons described in section (i) and (ii) above own more than fifty percent (50%) of the beneficial interests; (iv) a foundation in which any combination of the Participant and persons described in sections (i) and (ii) above control management of the assets; or (v) any other corporation, partnership, limited liability company or other entity in which any combination of the Participant and persons described in sections (i) and (ii) above control more than fifty percent (50%) of the voting interests.

“Incumbent Directors” means:

(1) the individuals who, on the date hereof, constitute the Board; and

(2) any new Director whose appointment or election by the Board or nomination for election by the Company’s shareholders was approved or recommended: (a) by the vote of at least two-thirds (2/3) of the Whole Board, with at least two-thirds of the Incumbent Directors then in office voting in favor of such approval or recommendation; or (b) by a Nominating Committee of the Board whose members were appointed by the vote of at least two-thirds (2/3) of the Whole Board, with at least two-thirds of the Incumbent Directors then in office voting in favor of such appointments.

“Involuntary Termination” means the Termination of Service of a Participant by the Company or Subsidiary, other than a termination for Cause, or termination of employment by an Employee for Good Reason.

“Incentive Stock Option” or “ISO” has the meaning ascribed to it in Section 2.1(a).

“Non-Qualified Option” means the right to purchase shares of Stock that is either (i) designated as a Non-Qualified Option, (ii) granted to a Participant who is not an Employee, or (iii) granted to an Employee and either is not designated by the Committee to be an ISO or does not satisfy the requirements of Code Section 422.

“Performance Award” means an Award that vests in whole or in part upon the achievement of one or more specified performance measures, as determined by the Committee. Regardless of whether an Award is subject to the attainment of one or more performance measures, the Committee may also condition the vesting thereof upon the continued Service of the Participant. The conditions for grant or vesting and the other provisions of a Performance Award (including without limitation any applicable performance measures) need not be the same with respect to each recipient. A Performance Award shall vest, or as to Restricted Stock Units be settled, after the Committee has determined that the performance goals have been satisfied.

Performance measures can include, but are not limited to: book value or tangible book value per share; basic earnings per share (e.g., earnings before interest and taxes, earnings before interest, taxes, depreciation and

amortization; or earnings per share); basic cash earnings per share; diluted earnings per share; return on equity; net income or net income before taxes; net interest income; non-interest income; non-interest expense to average assets ratio; cash general and administrative expense to average assets ratio; efficiency ratio; cash efficiency ratio; financial return ratios; adjusted earnings, capital; increase in revenue; total shareholder return; net operating income, operating income; net interest margin or net interest rate spread; stock price; assets, growth in assets, loans or deposits, asset quality level, charge offs, loan reserves, non-performing assets, loans, deposits, growth of loans, loan production volume, non-performing loans, deposits or assets; regulatory compliance or safety and soundness; achievement of balance sheet or income statement objectives and strategic business objectives, or any combination of these or other measures.

Performance measures may be based on the performance of the Company as a whole or on any one or more Subsidiaries or business units of the Company or a Subsidiary and may be measured relative to a peer group, an index or a business plan and may be considered as absolute measures or changes in measures. The terms of an Award may provide that partial achievement of performance measures may result in partial payment or vesting of the Award or that the achievement of the performance measures may be measured over more than one period or fiscal year. In establishing any performance measures, the Committee may provide for the exclusion of the effects of certain items, including but not limited to: (i) extraordinary, unusual, infrequently occurring and/or nonrecurring events or items of gain or loss; (ii) gains or losses on the disposition of a business; (iii) dividends declared on the Company’s stock; (iv) changes in tax or accounting principles, regulations or laws; or (v) expenses incurred in connection with a merger, branch acquisition or similar transaction. Subject to the preceding sentence, if the Committee determines that a change in the business, operations, corporate structure or capital structure of the Company or the manner in which the Company or its Subsidiaries conducts its business or other events or circumstances render current performance measures to be unsuitable, the Committee may modify such performance measures, in whole or in part, as the Committee deems appropriate. Notwithstanding anything to the contrary herein, performance measures relating to any Award hereunder will be modified, to the extent applicable, to reflect a change in the outstanding shares of Stock of the Company by reason of any stock dividend or stock split, or a corporate transaction, such as a merger of the Company into another corporation, any separation of a corporation or any partial or complete liquidation by the Company or a Subsidiary. If a Participant is promoted, demoted or transferred to a different business unit during a performance period, the Committee may determine that the selected performance measures or applicable performance period are no longer appropriate, in which case, the Committee, in its sole discretion, may: (i) adjust, change or eliminate the performance measures or change the applicable performance period; or (ii) cause to be made a cash payment to the Participant in an amount determined by the Committee.

“Restricted Stock” or “Restricted Stock Award” has the meaning ascribed to it in Section 2.1(b).

“Restricted Stock Unit” has the meaning ascribed to it in Section 2.1(c).

“Retirement” means, unless otherwise provided in an Award Agreement, termination of employment after attainment of age 65 (other than termination for Cause) or discontinuance of Service as a Director following attainment of age 65. An Employee who is also a Director shall not be deemed to have terminated due to Retirement for purposes of vesting of Awards and exercise of Stock Options until both Service as an Employee and Service as a Director has ceased. A non-employee Director will be deemed to have terminated due to Retirement under the provisions of this Plan only if the non-employee Director has terminated Service on the Board(s) of Directors of the Company and any Subsidiary or affiliate in accordance with applicable Company policy, following the provision of written notice to such Board(s) of Directors of the non-employee Director’s intention to retire.

“SEC” means the United States Securities and Exchange Commission.

“Securities Act” means the Securities Act of 1933, as amended and the rules, regulations and guidance promulgated thereunder and modified from time to time.

“Service” means service as an Employee, non-employee Director, or service provider of the Company or a Subsidiary, as the case may be, and includes service as a director emeritus or advisory director. Service shall not be deemed interrupted in the case of (i) any approved leave of absence for military service or sickness, or for any other purpose approved by the Company or a Subsidiary, if the Employee’s right to re-employment is guaranteed either by a statute or by contract or under the policy pursuant to which the leave of absence was granted or if the

Committee otherwise so provides in writing, (ii) transfers among the Company, any Subsidiary, or any successor entities, in any capacity of Employee or Director, or (iii) any change in status as long as the individual remains in the service of the Company or a Subsidiary in any capacity as an Employee or Director (except as otherwise provided in the Award Agreement).

“Stock” means the common stock of the Company, $0.01 par value per share.

“Stock Option” has the meaning ascribed to it in Section 2.1(a).

“Subsidiary” means any corporation, affiliate, bank or other entity which would be a subsidiary corporation with respect to the Company as defined in Code Section 424(f) and, other than with respect to an ISO, also means any partnership or joint venture in which the Company and/or any other Subsidiary owns more than fifty percent (50%) of the capital or profits interests.

“Termination of Service” means the first day occurring on or after a grant date on which the Participant ceases to be an Employee or Director of (including a director emeritus or advisory director), or service provider to, the Company or any Subsidiary, regardless of the reason for such cessation, subject to the following:

(1) The Participant’s cessation of Service as an Employee or service provider shall not be deemed to occur by reason of the transfer of the Participant between the Company and a Subsidiary or between two Subsidiaries.

(2) The Participant’s cessation as an Employee or service provider shall not be deemed to occur by reason of the Participant’s being on a bona fide leave of absence from the Company or a Subsidiary approved by the Company or Subsidiary otherwise receiving the Participant’s Services provided the leave of absence does not exceed six (6) months, or if longer, so long as the Employee retains a right to reemployment with the Company or Subsidiary under an applicable statute or by contract. For these purposes, a leave of absence constitutes a bona fide leave of absence only if there is a reasonable expectation that the Employee will return to perform Services for the Company or Subsidiary. If the period of leave exceeds six (6) months and the Employee does not retain a right to reemployment under an applicable statute or by contract, the employment relationship is deemed to terminate on the first day immediately following the six (6) month period. For purposes of this sub-section, to the extent applicable, an Employee’s leave of absence shall be interpreted by the Committee in a manner consistent with Treasury Regulation Section 1.409A-1(h)(1).

(3) If, as a result of a sale or other transaction, the Subsidiary for whom Participant is employed (or to whom the Participant is providing services) ceases to be a Subsidiary, and the Participant is not, following the transaction, an Employee of or service provider to the Company or an entity that is then a Subsidiary, then the occurrence of the transaction shall be treated as the Participant’s Termination of Service caused by the Participant being discharged by the entity by which the Participant is employed or to which the Participant is providing Services.

(4) Except to the extent Code Section 409A may be applicable to an Award, and subject to the foregoing paragraphs of this sub-section, the Committee shall have discretion to determine if a Termination of Service has occurred and the date on which it occurred. If any Award under the Plan constitutes Deferred Compensation (as defined in Section 2.6), the term Termination of Service shall be interpreted by the Committee in a manner consistent with the definition of “Separation from Service” as defined under Code Section 409A and under Treasury Regulation Section 1.409A-1(h)(ii). For purposes of this Plan, a “Separation from Service” shall have occurred if the employer and Participant reasonably anticipate that no further Services will be performed by the Participant after the date of the Termination of Service (whether as an employee or as an independent contractor) or the level of further Services performed will be less than fifty percent (50%) of the average level of bona fide Services in the thirty-six (36) months immediately preceding the Termination of Service. If a Participant is a “Specified Employee,” as defined in Code Section 409A and any payment to be made hereunder shall be determined to be subject to Code Section 409A, then if required by Code Section 409A, the payment or a portion of the payment (to the minimum extent possible) shall be delayed and shall be paid on the first day of the seventh month following Participant’s Separation from Service.

(5) With respect to a Participant who is a Director, cessation as a Director will not be deemed to have occurred if the Participant continues as a director emeritus or advisory director. With respect to a Participant who is

both an Employee and a Director, termination of employment as an Employee shall not constitute a Termination of Service for purposes of the Plan so long as the Participant continues to provide Service as a Director or director emeritus or advisory director.

“Voting Securities” means any securities which ordinarily possess the power to vote in the election of directors without the happening of any pre-condition or contingency.

“Whole Board” means the total number of Directors that the Company would have if there were no vacancies on the Board of Directors at the time the relevant action or matter is presented to the Board of Directors for approval.

Section 8.2 In this Plan, unless otherwise stated or the context otherwise requires, the following uses apply:

(a) Actions permitted under this Plan may be taken at any time and from time to time in the actor’s reasonable discretion;

(b) References to a statute shall refer to the statute and any successor statute, and to all regulations promulgated under or implementing the statute or its successor, as in effect at the relevant time;

(c) In computing periods from a specified date to a later specified date, the words “from” and “commencing on” (and the like) mean “from and including,” and the words “to,” “until” and “ending on” (and the like) mean “to, but excluding”;

(d) References to a governmental or quasi-governmental agency, authority or instrumentality shall also refer to a regulatory body that succeeds to the functions of the agency, authority or instrumentality;

(e) Indications of time of day mean Massachusetts time;

(f) The word “including” means “including, but not limited to”;

(g) All references to sections, schedules and exhibits are to sections, schedules and exhibits in or to this Plan unless otherwise specified;

(h) All words used in this Plan will be construed to be of such gender or number as the circumstances and context require;

(i) The captions and headings of articles, sections, schedules and exhibits appearing in or attached to this Plan have been inserted solely for convenience of reference and shall not be considered a part of this Plan nor shall any of them affect the meaning or interpretation of this Plan or any of its provisions;

(j) Any reference to a document or set of documents in this Plan, and the rights and obligations of the parties under any such documents, shall mean such document or documents as amended from time to time, and any and all modifications, extensions, renewals, substitutions or replacements thereof; and

(k) All accounting terms not specifically defined herein shall be construed in accordance with GAAP.

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