Proxy Statement (Form DEF 14A)

2025 PROXY STATEMENT

and Notice of Annual Meeting of Stockholders

Notice of 2025 Annual Meeting of Stockholders

Dear Fellow Stockholders:

I am pleased to invite you to attend our 2025 Annual Meeting of Stockholders. It will be held via live audio webcast on May 22, 2025. Details regarding the items of business to be conducted at the Annual Meeting are described in the accompanying Proxy Statement:

We are sending a Notice Regarding the Availability of Proxy Materials to you on or about April 10, 2025. Stockholders of record at the close of business on March 27, 2025 will be entitled to vote at our Annual Meeting or any adjournments or postponements of the meeting. You have a choice of voting online during the open poll section of the meeting, over the internet, by telephone, or by requesting a paper copy of the proxy materials and a proxy card and then executing and returning the proxy card. In order to assure a quorum, please vote over the internet or by telephone, or request a paper copy of a proxy card and then complete, sign, date and retuthe proxy card in the postage-paid envelope provided, whether or not you plan to attend the meeting.

Thank you for your ongoing support of Wesco.

By order of the Board of Directors,

John J. Engel

Chairman, President and Chief Executive Officer

Important Notice Regarding the Availability of Proxy Materials for the Annual Meeting of Stockholders to be Held on May 22, 2025

The 2025 Proxy Statement and 2024 Annual Report of WESCO International, Inc. ("Wesco" or the "Company") are available to review at: www.proxydocs.com/wcc. A copy of our Annual Report on Form 10-Kis available upon request, at no cost. Any request should be directed to our Corporate Secretary at the Company's headquarters office located at 225 West Station Square Drive, Suite 700, Pittsburgh, Pennsylvania 15219-1122.

Questions and Answers

What is a proxy or proxy statement?

The Board is soliciting your proxy to vote at the Annual Meeting. A proxy is your legal designation of another person to vote the stock you own - that person is sometimes called "your proxy." A proxy statement is a document that the Securities and Exchange Commission (the "SEC") regulations require us to provide to you when we ask you to sign a proxy to designate someone to vote on your behalf.

Why did I receive a Notice Regarding the Availability of Proxy Materials? What is included in the proxy materials?

We are pleased to continue to utilize the SEC "Notice and Access" rule, which allows companies to distribute proxy materials to stockholders over the internet. A Notice Regarding the Availability of Proxy Materials (a "Notice") contains instructions on how to access the proxy materials online, describes the matters to be considered at our Annual Meeting, and provides instructions on how to vote your shares. By using the Notice and Access model, we are reducing costs and minimizing the environmental impact of our Annual Meeting. We encourage you to sign up for direct email notice of the availability of future proxy materials by submitting your email address when you vote your proxy via the internet.

The proxy materials for the Annual Meeting include the Notice, this Proxy Statement, and our Annual Report on Form 10-K.If you receive a paper copy of these materials, the proxy materials also include a proxy card or voting instruction form. Proxy materials are first being made available to stockholders on April 10, 2025.

What does it mean if I receive more than one Notice?

If your shares are registered differently or held in multiple accounts (for example, some shares may be registered directly in your name and some may be held in the Company's 401(k) Retirement Savings Plan), you may receive more than one Notice from the Company or, if your shares are beneficially owned (also known as held in "street name"), from your broker, bank or other nominee. Please carefully follow the instructions on each Notice you receive and vote all proxies to ensure that all your shares are voted.

What is the record date?

The Board established March 27, 2025 as the record date. If you owned shares of the Company's Common Stock at the close of business on March 27, 2025, you may vote at the Annual Meeting. On that date, there were 48,800,081 outstanding shares of our Common Stock. Each share of Common Stock is entitled to one vote on each matter presented for consideration and action at the Annual Meeting.

How do I attend the Annual Meeting?

Our Annual Meeting will be exclusively conducted via live audio webcast. We are excited to leverage technology to expand stockholder access and allow for stockholders to participate from any location around the world and save Wesco and its stockholders time and money. We have designed the virtual meeting with the aim of providing all stockholders the same rights and opportunities to participate as they would have at an in-personmeeting. In addition to online attendance, our meeting format provides stockholders with the opportunity to hear all portions of the official meeting, submit written questions, and vote online during the open poll section of the meeting.

You may attend the meeting webcast by visiting http://www.virtualshareholdermeeting.com/WCC2025. You will need the 16-digitcontrol number received with your Notice. If a bank, brokerage firm, or other nominee holds your shares, you should contact that organization for additional information. Rules of conduct for our Annual Meeting will be available once you access the meeting webcast.

The meeting is scheduled to begin at 2:00 p.m. E.D.T. on May 22, 2025, and online check-inis scheduled to begin at 1:45 p.m. E.D.T. We encourage you to access the meeting platform prior to the meeting start time. The virtual meeting platform is supported across most internet browsers and devices (such as desktops, laptops, tablets, and cell phones) running the most up-to-dateversion of applicable software and plug-ins.Participants should ensure that they have a sufficient internet connection wherever they intend to participate in the meeting. If you encounter any technical difficulties when accessing or using the virtual meeting website, please call the technical support number that will be posted on the meeting website login page.

How can I ask questions during the Annual Meeting?

The virtual format allows stockholders to communicate with us in advance of, and during, the Annual Meeting so they can ask questions of our Board of Directors or management. To submit a question, you must login to the meeting platform using your control number, locate the "Ask a Question" section of the page, select a topic from the "Question Topic" menu, type your question into the "Submit a Question" field, and click "Submit." During the Annual Meeting, we will answer questions submitted that are relevant to the business of the Annual Meeting as time permits and in accordance with our meeting rules and procedures. In the interest of addressing as many stockholder questions as possible in the time allotted, stockholders will generally be limited to one question per proposal and questions that are substantially similar may be grouped and answered once. Questions that are not relevant to the official business of the Annual Meeting or that include derogatory, offensive, or uncivil language or that are otherwise inappropriate or not suitable for the conduct of the Annual Meeting will not be addressed during the meeting. Responses to any questions appropriately submitted and relevant to the official business of the Annual Meeting that were not answered during the meeting due to time constraints will be posted to our Investor Relations website (https://investors.wesco.com) as soon as practicable after the Annual Meeting.

What are the proposals to be voted on at the Annual Meeting? How many votes are needed to approve each proposal? How do abstentions and broker non-votesaffect the voting results?

Action may be taken at the Annual Meeting with respect to any other business that properly comes before the meeting, and the proxy holders have the right to and will vote in accordance with their judgment on any additional business.

How do I cast my vote?

There are four different ways you may cast your vote. You may vote by:

The deadline for voting by internet, telephone, or mail is receipt by 11:59 p.m. E.D.T. on May 21, 2025. If you have any questions or need assistance with voting, please contact our proxy solicitor, Innisfree M&A Incorporated ("Innisfree") at (888) 750-5834(for shareholders) or (212) 750-5833(for banks and brokers).

How do I revoke or change my vote?

If you have returned a proxy via the internet, telephone or mail, you may revoke it at any time before it is voted at the Annual Meeting by:

What is the difference between holding shares as a registered stockholder and a beneficial holder?

If your shares are registered directly in your name with our transfer agent, Computershare, then you are considered a registered stockholder with respect to those shares. If you hold your shares through an intermediary, such as a bank, broker, or other nominee (sometimes referred to as shares held in "street name"), then you are considered the beneficial holder of those shares.

What if I don't indicate my voting choices?

If you are a registered stockholder and retuyour signed proxy card but do not mark the boxes showing how you wish to vote on any particular matter, your shares will be voted in the manner recommended by our Board on each matter presented in this Proxy Statement.

If you are a beneficial holder, then your broker, bank or other nominee will ask you how you want to vote your shares. If you give the broker, bank or nominee instructions, your shares will be voted as you direct. If you do not give instructions, your broker, bank or nominee may vote your shares only on proposals that are considered routine matters. The only routine matter being proposed for stockholder vote at the Annual Meeting is the proposal to ratify the appointment of PricewaterhouseCoopers LLP as our independent registered public accounting firm for the year ending December 31, 2025. So, without voting instructions from the beneficial owner of the shares, brokers, bank or other nominee holders will not have discretionary authority to vote the shares at the Annual Meeting on any of the other proposals. We encourage you to provide instructions to your bank, broker or nominee by carefully following the instructions provided. This will ensure that your shares are voted at the Annual Meeting as you direct.

Who will count the votes?

Representatives of Broadridge Financial Solutions, Inc. ("Broadridge") will tabulate the votes, and there will be a duly appointed inspector of election who will certify his or her examination of the list of stockholders, the number of shares held and outstanding as of the record date, and the necessary quorum for transaction of the business for this meeting. These persons will count the votes at the Annual Meeting.

How many votes must be present to hold the Annual Meeting? What is a quorum?

A quorum of stockholders is required to conduct business at the Annual Meeting. A quorum is met if the holders of a majority of the outstanding shares of the Company's Common Stock entitled to vote at the Annual Meeting are present either in person or by proxy at the Annual Meeting. Abstentions, broker non-votesand votes withheld from Director nominees count as shares present for purposes of determining a quorum.

How will Wesco solicit votes and who pays for the proxy solicitation?

Wesco pays the cost of preparing our proxy materials and soliciting your vote. We have engaged Innisfree to assist with the solicitation of proxies for an estimated fee of $20,000 plus expenses. Wesco will reimburse brokerage firms and other persons representing beneficial owners of shares for reasonable expenses incurred by them in forwarding proxy-soliciting materials to such beneficial owners. Proxies may be solicited on our behalf by our Directors, officers, employees and agents, without additional remuneration, by telephone, electronic or facsimile transmission or in person.

May I elect to receive a paper copy of proxy materials in the future?

Stockholders can elect to receive future Wesco Proxy Statements and Annual Reports via paper copies in the mail.

If you are a registered stockholder, you can choose to receive future Annual Reports and Proxy Statements via paper copy at no charge by writing to WESCO International, Inc., 225 West Station Square Drive, Suite 700, Pittsburgh, Pennsylvania, 15219-1122,Attention: Corporate Secretary. If you are a beneficial holder, follow the information provided by your nominee for instructions on how to elect to receive paper copies of future Annual Reports and Proxy Statements.

If you enroll to receive paper copies of Wesco's future Annual Reports and Proxy Statements, your enrollment will remain in effect for all future stockholders' meetings unless you cancel the enrollment.

What is householding?

Stockholders who share the same last name and address will receive one package containing a separate Notice for each individual stockholder at that address. Stockholders who have elected to receive paper copies and who share the same last name and address will receive only one set of our Annual Report on Form 10-Kand Proxy Statement, unless such stockholders have notified us that they wish to continue receiving multiple copies. This method of delivery, known as "householding," will help ensure that stockholder households do not receive multiple copies of the same document and lowers the costs and the environmental impact of our Annual Meeting.

If you are a registered stockholder, you can opt out of the householding practice and receive prompt delivery of a separate copy of the materials by calling Broadridge at 1-866-540-7095.If you would like to opt out of this practice and you are a beneficial holder, please contact your bank or broker.

If you receive multiple copies of proxy materials at your household and would prefer to receive a single copy of these materials, please contact Broadridge at the above telephone number. If you are a beneficial holder, please contact your bank or broker.

Proposal 1 - Election of Directors

The following Director Nominees have been nominated for election to our Board for a term expiring at the 2026 Annual Meeting of Stockholders: John J. Engel, Glynis A. Bryan, Anne M. Cooney, Matthew J. Espe, Bobby J. Griffin, Sundaram Nagarajan, Steven A. Raymund, James L. Singleton, Easwaran Sundaram and Laura K. Thompson.

OUR BOARD UNANIMOUSLY RECOMMENDS A VOTE "FOR"

EACH OF THE DIRECTOR NOMINEES.

Board of Directors

The Board is composed of ten directors as of the filing date of this Proxy Statement. The current Director Nominees are to be elected at the Annual Meeting for a one-yearterm expiring in 2026, subject to earlier retirement, resignation or removal.

The following is the complete list of individuals who comprise our Board of Directors and Board Committees as of March 27, 2025.

 Chair

  Member

The following information is provided regarding our Directors as of March 27, 2025:

Our Board proactively seeks Director candidates to provide representation of relevant and varied backgrounds, perspectives, skills, and experiences in our business and in the boardroom. During the past seven years, the Board has added five new Directors as part of its on-goingrefreshment process.

The matrix below describes the self-identified gender and race or ethnicity attributes of our Directors:

Director Skills, Experience, and Background

The Board regularly reviews the relevant skills, experiences, and backgrounds that it believes are desirable to be represented on the Board and, in conjunction with the Board's refreshment process described herein, has evaluated these skills and qualifications to align with the Company's strategic vision, business and operations. The following is a description of some of these skills, experiences and backgrounds, along with the percentage of our Directors that bring such skills and qualifications to the Board.

Board composition is assessed by the Nominating and Governance Committee and the Board to achieve the appropriate mix of skills and experiences so that the Board, taken as a whole, is well-situated to fulfill the needs of the Company and its stockholders. Also, it is considered particularly beneficial that 100% of Board members have strategic leadership, executive management leadership, and operational expertise, as well as international experience and public company board service.

Nominee Directors to Serve for a One-YearTerm Expiring in 2026

Corporate Governance

Corporate Governance Guidelines

We have adopted Corporate Governance Guidelines in conformity with the New York Stock Exchange ("NYSE") listed company standards to provide a framework to assist members of our Board in fully understanding and effectively implementing their responsibilities while assuring our on-goingcommitment to high standards of corporate conduct and compliance.

We have adopted a Wesco Code of Business Conduct and a Global Antibribery and Anticorruption Policy which apply to our Board of Directors and all of our employees and cover all areas of professional conduct, including customer relations, conflicts of interest, insider trading, financial disclosure, and compliance with applicable laws and regulations.

We also have adopted a Code of Principles for Senior Financial Executives, referred to as the Senior Financial Executive Code, which applies to our Chief Executive Officer, Chief Financial Officer and Corporate Controller. We disclose future amendments to, or waivers from, the Senior Financial Executive Code on the corporate governance section of our website within four business days of any amendment or waiver.

You may access our Corporate Governance Guidelines, Committee Charters, Code of Business Conduct, Global Antibribery and Anticorruption Policy, Senior Financial Executive Code, Independence Policy, and related documents on our website at https://www.wesco.com/us/en/our-company/leadership.html#policies.

Director Independence

Our Board has adopted independence standards that meet or exceed the independence standards of the NYSE, including the enhanced independence requirements for audit and compensation committee members. In addition, as part of our independence standards, our Board has adopted categorical standards to assist it in evaluating the independence of each of its Directors. The categorical standards are intended to assist our Board in determining whether or not certain direct or indirect relationships between its Directors and our Company or its subsidiaries are "material relationships" for purposes of the NYSE independence standards. The categorical standards establish thresholds at which any relationship is deemed to be material.

Annually, the independence of each Director is reviewed, applying applicable independence standards. The review considers relationships and transactions between each Director and his or her immediate family and affiliates and our management and our independent registered public accounting firm. Based on this review, our Board has affirmatively determined that the following Directors are independent: Messrs. Espe, Griffin, Nagarajan, Raymund, Singleton and Sundaram and Messes. Bryan, Cooney and Thompson.

Director Qualifications

Our Nominating and Governance Committee reviews with the Board at least annually the qualifications of new and existing Board members, considering the level of independence of individual members, together with such other factors, including overall skills and experience. Each Director's particular and specific experience, qualifications, attributes or skills which support his or her position as a Director on our Board include those that are identified in the Proposal 1 - Election of the Board of Directors section of this Proxy Statement.

The Nominating and Governance Committee considers various factors in determining whether to recommend a candidate for nomination as a Director, including an individual's aptitude for independent analysis, level of integrity, personal and professional ethics, soundness of business judgment, relevant experience, skills, and ability and willingness to commit sufficient time to Board activities. As part of this annual review, Directors disclose their service on other boards, which the Nominating and Governance Committee takes into consideration when evaluating a Director's ability to devote sufficient time to the Company's Board. The Nominating and Governance Committee consults with the Board to determine the most appropriate combination of characteristics, skills and experiences for the Board as a whole with the objective of having a Board whose members have a variety of backgrounds and experiences and sufficient domain knowledge of the Company's end markets and distribution industry. The Nominating and Governance Committee considers candidates' professional experience and evaluates each individual in the context of the individual's potential contribution to the Board as a whole to best promote the success of the Company's business, represent stockholder interests through the exercise of sound judgment, and allow the Board to benefit from the group's range of backgrounds, experiences and skills.

The Nominating and Governance Committee also reviews the characteristics of incumbent Board members and prospective Board members to ensure that the Board, as a whole, possesses the experience, expertise and competencies that are relevant or desirable. The Nominating and Governance Committee uses a skills matrix to assess the overall composition of the Board, including such characteristics as CEO experience, strategy and operational expertise, financial expertise, capital markets expertise, human capital management expertise, sustainability and environmental expertise, corporate governance experience, risk management experience, supply chain and industry experience, mergers and acquisitions experience, international experience, and technology and cybersecurity experience, among others. These processes are designed to ensure a high-functioning and well-composed Board of independent and capable Directors with relevant experience.

The Nominating and Governance Committee may also target prospective candidates for Board membership based on their attributes compared to current Board members to achieve a strong overall Board composition. The Nominating and Governance Committee applies the same criteria to all candidates that it considers, including any candidates submitted by stockholders.

Board Refreshment and Tenure

The Board is committed to ongoing Board refreshment. The Board considers a balanced Board in terms of overall average Director tenure, comprising newer Directors as well as those who have longer experience with the Company, to benefit the Company and its stockholders by providing fresh perspectives, experience and stability. As part of its Board refreshment process, the Board has recruited a new Director in five of the past seven years. Currently, 33% of our independent Directors have a tenure of five years or less, and the average tenure of our independent Directors as of March 27, 2025 is 9.42 years with a median tenure of 7.51 years. In order to develop a balanced Board, we have a robust Director recruitment process that includes utilizing the assistance of a nationally recognized recruiting firm to identify and recruit potential candidates for our Board of Directors based on attributes outlined on a skills matrix that was developed by the Nominating and Governance Committee. For each recruiting engagement, the Nominating and Governance Committee, working with the independent recruiting firm and including input from the Board, develops specifications for each director position, which are used to identify and recruit director candidates.

Board, Committee and Director Evaluations

The Board has established a robust self-evaluation process for the Board, its Committees and individual Directors. Each year, our Board and Committees conduct evaluations to assess their effectiveness and adherence to the Corporate Governance Guidelines and Committee charters, and to identify opportunities to improve Board and Committee performance. As part of that process, we also conduct individual Director evaluations, including peer assessments. As described below, the Board engages an independent corporate governance professional to conduct interviews with each Director as part of this process.

Under the leadership of our Lead Director, Mr. Singleton, our annual evaluation process focused on three components: (1) the Board, (2) Board Committees and (3) individual Directors. An independent third party who is experienced in corporate governance matters interviews each Director to obtain his or her assessment of the effectiveness of the Board and its Committees, including identifying any opportunities the Board can focus on to enhance effectiveness. In addition, the Board conducted a peer review process in which the third party sought input regarding the performance of each individual Director. Our Lead Director provides overall Board and Committee evaluation feedback and leads a discussion with the entire Board, and also provides feedback to each Director in an individual session.

Director Continuing Education

As part of our efforts designed to ensure a continuing high-performance Board, Directors participate in continuing education on current topics and developments. We bring outside experts into the Board room to review current topics and developments in their areas of expertise, and Directors regularly attend outside education sessions on relevant topics. Education topics include corporate governance, compensation, SEC developments, financial matters, economic developments, emerging technology and trends, risk management, cybersecurity, and others.

Compensation Committee Interlocks

None of our executive officers serves as an executive officer of, or as a member of, the compensation committee of any public company that has an executive officer, director or other designee serving as a member of our Board. No member of our Compensation Committee has been an executive officer of the Company.

Executive Sessions and Lead Director Responsibility

During 2024, the non-managementmembers of our Board met in executive session at each regularly scheduled Board of Directors' meeting. Our Directors generally hold executive sessions at both the beginning and end of each Board meeting. As Lead Director, Mr. Singleton presided over these executive sessions. In addition, Mr. Singleton has broad authority to call and conduct meetings of the independent Directors. The duties and responsibilities of our Lead Director are described in more detail in the section below.

Board Leadership Structure

Since 2011, Mr. Engel has served as Chairman of the Board. The Board believes that Mr. Engel's combined role of Chairman and Chief Executive Officer is in the best interests of the Company and its stockholders at this time, and that Mr. Engel is the Director best situated to serve as Chairman because of his detailed and in-depthknowledge of the issues, opportunities and challenges facing the Company, his familiarity with the Company's business and industry, and his ability to identify strategic priorities essential to the future success of the Company. The Board believes that this structure is best for the Company because it provides for clear leadership responsibility and accountability, while providing for effective corporate governance and oversight by an independent Board of strong and seasoned Directors with an independent Lead Director. Mr. Singleton serves as the Board's independent Lead Director and presides over executive sessions of the Board. The non-managementmembers of our Board meet in executive session at each regularly scheduled Board meeting. The Audit, Compensation, and Nominating and Governance Committees are all chaired by and composed solely of independent Directors in accordance with independence standards of the NYSE, and thus oversight of key matters is entrusted to the independent Directors. Each of these Committees also meets in executive session without members of management present. The responsibilities of the Lead Director include the following:

The Lead Director assures that appropriate independence is brought to bear on important Board and governance matters. In addition, there is strong leadership vested in and exercised by the independent Committee chairs, and each Director may request inclusion of specific items on the agendas for Board and Committee meetings.

Considering all of the above, the Board believes that a combined Chairman and Chief Executive Officer, together with the Lead Director, is an appropriate Board leadership structure and is in the best interests of the Company and its stockholders at this time.

Communications with Directors

Our Board has established a process by which stockholders and other interested parties may communicate with the Board, our Board Committees, and/or individual Directors by confidential e-mail.Such communications should be sent in writing to the e-mailaddress noted in the corporate governance section of our website at https://www.wesco.com/us/en/our-company/leadership.html#contact.

Our Chief Compliance Officer will review all of these communications on a timely basis and will forward appropriate communications (i.e., other than solicitations, invitations, advertisements, or similar communications) to the relevant Board members on a timely basis.

Stockholders who wish to communicate with our Board in writing via regular mail should send correspondence to: WESCO International, Inc., 225 West Station Square Drive, Suite 700, Pittsburgh, Pennsylvania, 15219-1122, Attention: Corporate Secretary.

Our Board members routinely attend our Annual Meeting of Stockholders. This provides you with additional opportunities to communicate with our Board. All of our Board members were present at our Annual Meeting of Stockholders.

Director Nominating Procedures

Our Nominating and Governance Committee recommends potential candidates for nomination as Director based on a number of criteria, including the needs of our Board. Any stockholder who would like the Nominating and Governance Committee to consider a candidate for Board membership should send a letter of recommendation that includes:

To allow for timely consideration, recommendations must be received not less than 90 days prior to the first anniversary of the date of our most recent Annual Meeting. In addition, the Company may request additional information regarding any proposed candidates. A stockholder who wishes to nominate a person for election as a Director must provide written notice to the Corporate Secretary of the Company at the address below in accordance with the procedures specified in Section 2.15 of our By-Laws.In general, to be timely, the written notice must be received by our Corporate Secretary not less than 90 days prior to the first anniversary of the date of our most recent Annual Meeting. The notice must provide certain information required by the By-Laws,including (a) biographical and share ownership information of the stockholder (and certain affiliates), (b) descriptions of any material interests of the stockholder (and certain affiliates) in the nomination and any arrangements between the stockholder (and certain affiliates) and another person or entity with respect to the nomination, (c) certain biographical, employment and specific qualifications information of each nominee, and (d) a brief description of any arrangement or understanding between each individual proposed as a nominee and any other person pursuant to which the individual was selected as a nominee. Any notice of director nomination submitted must comply with the additional requirements of, and include the additional information required by, Rule 14a-19(b)under the Securities Exchange Act of 1934, as amended.

Notices of Director recommendations or Director nominations, including the information described above, should be sent to: WESCO International, Inc., 225 West Station Square Drive, Suite 700, Pittsburgh, Pennsylvania, 15219-1122, Attention: Corporate Secretary.

Director Resignation Policy

The Board has adopted a resignation policy under which any Director who does not receive a majority of votes cast for his or her re-electionis expected to offer his or her resignation for the Board's consideration.

Stockholder Engagement

We seek to engage with current and prospective investors throughout the year in order to review our financial performance, business model and strategic initiatives, so that management and the Board can better understand stockholder perspectives. We also utilize these discussions to assess emerging issues that may help shape our practices and enhance our corporate disclosures, including in the areas of environmental, social and governance issues, executive compensation and capital deployment strategies. We strive for a collaborative approach with our stockholders and value the variety of perspectives that we hear in our discussions with them.

Board's Role in Oversight of Risk Management

Management is responsible for risk management, and the Board's role is to oversee management's efforts in this area. As part of their regular meetings and deliberations, the Board and its Committees review and discuss matters of significance regarding operational, financial and other risks that are relevant to the Company's business. Strategic risks and operating risks are monitored by the Board through discussions regarding the Company's strategic and operating plans and regular reviews of the Company's operating performance. Certain topics, including succession planning and mergers and acquisitions, are of such importance that they are reviewed for the full Board and not delegated to a specific committee. In addition, management assesses the Company's enterprise risk and reviews with the entire Board significant risks and associated mitigating factors on an annual basis.

Our Board has tasked designated standing committees with oversight of certain categories of risk management. The risk oversight focus areas of the committees are:

The Audit Committee, which is composed 100% of independent members, discusses and reviews guidelines and policies with respect to risk assessment and risk management and discusses with management the Company's major financial risk exposures

and the steps management takes to monitor and control such exposures. The Audit Committee is also responsible for oversight of cybersecurity risk. The Compensation Committee, which is composed 100% of independent members, reviews the potential for risk related to the Company's compensation arrangements, including compensation arrangements and policies for executives, and determines whether any such arrangements are likely to encourage excessive or inappropriate risk taking. The Nominating and Governance Committee, which is composed 100% of independent members, is responsible for oversight of significant environmental, social and governance matters that are relevant to the Company.

To more effectively prevent, detect and respond to information security threats, the Company has a dedicated Chief Information Security Officer ("CISO") whose team is responsible for leading enterprise-wide information security strategy, policy, standards, architecture and processes. The CISO reports to our Executive Vice President, Chief Information and Digital Officer ("CIDO"), who reports directly to our Chief Executive Officer. The CISO and CIDO regularly review cybersecurity matters with our Chief Executive Officer and other members of our senior management, including cybersecurity risks and threats and the status of our cybersecurity incident response plan and related processes relating to the prevention, detection, mitigation and remediation of cybersecurity incidents. As part of its oversight responsibility of cybersecurity risk and the overall enterprise risk management process, the Audit Committee meets at least quarterly with the Company's CISO, the CIDO, and other senior management to receive updates on cybersecurity risks and threats (and should they arise, any material incidents), the status of initiatives to strengthen the Company's information security systems, management's assessments of the Company's security program and compliance with disclosure requirements. The Audit Committee and senior management report any findings and recommendations, as appropriate to the full Board of Directors for consideration. The Company has developed and conducts mandatory information security training programs for all employees and maintains cyber liability insurance policies.

Environmental, Social and Governance Matters

The Board oversees the Company's efforts to conduct its business in a principled, transparent, and accountable manner. The Board believes that its effective oversight of environmental, social and governance matters is central to its risk oversight function. The Nominating and Governance Committee is responsible for oversight of significant matters in these areas, and the Audit and Compensation Committees are delegated responsibility for oversight of specific topics. However, the Board receives regular updates from each of the Committees and retains ultimate oversight responsibility for these matters.

Our management teams work with senior leaders to set strategy and develop goals to embed sustainability objectives across our organization. Management of our sustainability programs is led by the Executive Vice President, Supply Chain and Operations who reports at least annually to the Board and as appropriate to the Board Committees on the status of these programs.

Sustainability Initiatives

We promote ethics, safety, and environmental sustainability in conducting our business. We act responsibly and strive to reduce our environmental impact by how we service customers and the communities in which we operate. To guide Company initiatives toward measurable change, we established the following 2030 sustainability goals:

Achieving these goals depends on the collective action of our business and functional units, as well as alignment across our Company management. The foundation of our environmental, health and safety management is our Global Environmental, Health, Safety and Sustainability Policy, which aligns with key provisions of the ISO 14001:2015 environmental management standards. The policy includes management accountability for environmental sustainability, direct program responsibilities, key performance indicators, and other metrics to track progress. To enhance our sustainability strategy, practices, and communications, we also engage with employees, customers, suppliers, stockholders, community members and other stakeholders.

As a business-to-businessdistribution, logistics services, and supply chain solutions services company, our approach to sustainability includes positive actions across our organization to reduce the environmental impacts of our own operations and assisting our customers and suppliers with attaining their sustainability goals through our products, services, and supply chain solutions. For example, we assist our customers in areas such as lighting efficiency, energy management, renewable energy, and green sustainable sourcing. We also support utilities as they work to meet their renewable portfolio standards initiatives (solar and wind generation projects). Our lighting renovation and retrofit business is focused on improving energy efficiency in offices, schools, high rise buildings and manufacturing plants and our automation solutions are focused on reducing waste for customers.

Overall, we continue to invest in new and emerging technologies and expand our capabilities in order to meet growing demands in these areas:

Safety

Our Sustainability Goals include a focus on employee safety, training and development, as these are core values of Wesco. We work to reduce or eliminate health and safety risks through dedicated programs, leadership commitments and employee involvement. We seek to achieve continuous improvement in the safety of our facilities and track a series of metrics that provide guidance toward that improvement.

Inclusive and Respectful Workplace Culture

We believe that our people and our high-performance culture are our greatest assets. We foster a culture that values and rewards employees based on merit. We also believe that making the most of the wealth of ideas, talents, skills, backgrounds, and perspectives from our people helps us do more and be more - together. We take pride in our talented and diverse workforce and aspire to become the employer of choice in our industry. Our Compensation Committee and Board are updated routinely by management on relevant programs and engage in regular discussions on matters such as workplace culture, talent development, and employee engagement.

We require that personnel actions are administered without any form of discrimination, and in compliance with applicable law.

We aim to support an inclusive and respectful workplace culture that:

Wesco has established six Business Resource Groups ("BRGs") to support and connect employees: Able (Employees with Diverse Abilities), Mosaic (Black, Latino, Indigenous, and People of Color), Pride (LGBTQ+), Spark (Early-Career Employees), VOLT (Veterans), and WIN (Women). These BRGs were created to foster a sense of community and inclusion and provide opportunities to network. All BRGs are open to all employees regardless of their identity.

Human Rights - At Wesco, the way in which we conduct business is as important as the products and services that we provide. Our Human Rights policy includes protections relating to:

We also expect vendors to comply with our Supplier Code of Conduct, which incorporates these human rights protections.

United Nations Global Compact

Wesco's focus on sustainability includes supporting the ten principles of the United Nations Global Compact, which we joined in 2017. We also support the United Nations Sustainable Development Goals. Our recent efforts have had the most impact for the goals below.

Transparency

Wesco provides sustainability-related information to stakeholders. We made significant enhancements to our Sustainability Report in 2024, including TCFD-aligned disclosures. Today, we leverage the following frameworks and standards to provide robust information:

More information about Wesco's sustainability activities can be found on our website at https://www.wesco.com.

Prohibition on Hedging and Pledging

The Company's Insider Trading Policy prohibits Section 16 Directors and Officers from engaging in any hedging transactions that involve Wesco securities. Wesco believes that this ensures a strong alignment of the interests of Directors and Officers with our stockholders. The policy also prohibits all Officers, Directors, Designated Insiders and employees from selling short (including short sales "against the box") or from trading, writing, or purchasing "put" or "call" options on Wesco securities. Section 16 Directors and Officers also are prohibited from holding securities of Wesco in a margin account and from using shares as collateral and pledging them as security for a loan. Designated Insiders and employee stockholders are not prohibited from using Wesco securities as collateral to secure a bona fide loan.

Stockholder Proposals for 2026 Annual Meeting

If you wish to have a stockholder proposal included in the Company's proxy soliciting materials for the 2026 Annual Meeting of Stockholders, you must submit the proposal to the Company at its principal executive offices by our deadline, which is 120 days prior to the first anniversary of the mailing of this Proxy Statement, or December 11, 2025. For any other business to be properly brought before the 2026 Annual Meeting by a stockholder, notice in writing must be delivered to the Company in accordance with the Company's Amended and Restated By-Lawsnot less than 90 days nor more than 120 days prior to the first anniversary of the 2025 Annual Meeting, or between January 22, 2026, and February 21, 2026. We may be required to include certain limited information concerning any such proposal in our Proxy Statement so that proxies solicited for the 2026 Annual Meeting may confer discretionary authority to vote on that matter. Any stockholder proposals should be addressed to our Corporate Secretary, WESCO International, Inc., 225 West Station Square Drive, Suite 700, Pittsburgh, Pennsylvania, 15219-1122.

Board and Committee Meetings

Our Board has four standing committees: an Audit Committee, a Compensation Committee, an Executive Committee, and a Nominating and Governance Committee. Each Committee operates under a separate charter, which is available on the corporate governance section of our website at https://www.wesco.com/us/en/our-company/leadership.html#policies.

The full Board held four meetings in 2024. Each Director attended 75% or more of the aggregate number of meetings of the full Board held in 2024 and the total number of meetings held by all Committees of the Board on which he or she served.

Director Compensation

Compensation

Independent members of the Board of Directors receive compensation in the form of an annual cash retainer paid quarterly and an annual equity award. Directors have the ability to defer 25% to 100% of the cash and equity retainers. Deferred annual cash retainer amounts were converted into stock units and credited to an account in the Director's name using the fair market value of our Common Stock on the dates the annual retainer would have been paid in the absence of a deferral election. The table below sets forth 2024 annual retainers our non-employeeDirectors, as determined based on analysis provided by the independent compensation consultant, as described below.

The Nominating and Governance Committee works with an independent compensation consultant, Meridian Compensation Partners, LLC ("Meridian"), to do an annual assessment of Director Compensation, including providing the Nominating and Governance Committee with market research and comparison data using a peer group of companies which is the same as that used in the Compensation Committee's evaluation of executive compensation. We review Director Compensation compared to that of the peer group. We query our consultant on new developments, best practices and trends in Director Compensation, and Meridian serves as a resource to the Nominating and Governance Committee.

In addition to the retainer, non-employeeDirectors are reimbursed for travel and other reasonable out-of-pocketexpenses related to attendance at Board and Committee meetings. Directors receive no additional compensation for Board or Committee meeting attendance. Members of our Board who are also our employees do not receive compensation for their services as Directors.

For 2024, non-employeeDirectors received equity grants in the form of Restricted Stock Units ("RSUs") in the amount of $185,000, which will vest on the first anniversary of the date of the grant. If a Director's Board service is terminated earlier than one year from the date of grant as a result of the scheduled expiration of the Director's term then, if such date is (1) less than three calendar months from the date of grant, then 25% of the RSUs shall be deemed vested, (2) at least three but less than six calendar months from the date of grant, then 50% of the RSUs shall be deemed vested, (3) at least six but less than nine calendar months from the date of grant, then 75% of the RSUs shall be deemed vested, and (4) at least nine calendar months from the date of grant, then 100% of the RSUs shall be deemed vested. On March 1, 2024, each non-employeeDirector received a grant of 1,217 RSUs with a grant date fair value of $152.07 per RSU, which was the closing price of our Common Stock on March 1, 2024.

Distribution of deferred stock units will be made in a lump sum or in installments, in the form of shares of our Common Stock, in accordance with the distribution schedule selected by the Director at the time the deferral election is made.

As set forth on an exhibit to the Company's Form 10-Kfiled on February 22, 2016, the Company has entered into indemnification agreements with each current Director providing for: indemnification for indemnifiable claims and losses; advancement of expenses; and D&O liability insurance.

Robust Stock Ownership Guidelines

Our Board has adopted robust stock ownership guidelines for Directors, which are five times their annual cash retainer. Directors are expected to hold these ownership positions during their service as Directors. All Directors have acquired or are acquiring stock in accordance with the stock ownership guidelines.

Director Compensation for 2024

Director Outstanding Equity Awards at Year-End⁽¹⁾

Security Ownership

Security Ownership of Management

The following table sets forth the number of shares of Company's Common Stock beneficially owned as of March 27, 2025, by each Director or nominee for Director of the Company, the named executive officers in the Summary Compensation Table and by all Directors and executive officers as a group. Unless otherwise indicated, the holders of all shares shown in the table have sole voting and investment power with respect to such shares. In determining the number and percentage of shares beneficially owned by each person, shares that may be acquired by such person pursuant to options or convertible stock exercisable or convertible within 60 days of March 27, 2025, are deemed outstanding for purposes of determining the total number of outstanding shares for such person and are not deemed outstanding for such purpose for all other stockholders.

* Indicates ownership of less than 1% of the Common Stock.

Delinquent Section 16(a) Reports

Under the federal securities laws of the United States, the Company's Directors, its executive officers, and any persons beneficially holding more than ten percent of the Company's Common Stock are required to report their ownership of the Company's Common Stock and any changes in that ownership to the SEC and NYSE. Specific due dates for these reports have been established. The Company is required to report in this Proxy Statement any failure to file by these dates. For the year ended December 31, 2024, all such filings were made within the required time periods, based on the Company's review of forms filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, as amended, and written representations received from such persons.

Security Ownership of Principal Stockholders

The following table sets forth the beneficial ownership of the Company's Common Stock as of March 27, 2025, by each person or group known by the Company to beneficially own five percent or more of the outstanding shares of the Company's Common Stock.

Transactions With Related Persons

Our Company has a written policy and has implemented processes and controls in order to obtain information from our Directors and executive officers with respect to related person transactions and for then determining whether our Company or a related person has a direct or indirect material interest in the transaction based on the facts and circumstances. Our Nominating and Governance Committee and Board review relationships and transactions between our Directors, executive officers and our Company or its customers and suppliers in order to determine whether the parties have a direct or indirect material interest. Its evaluation includes: the nature of the related person's interest in the transaction; material terms of the transaction; amount and type of transaction; importance of the transaction to our Company; whether the transaction would impair the judgment of a Director or executive officer to act in the best interest of our Company; and any other relevant facts and circumstances. Transactions that are determined to be directly or indirectly material to our Company or a related person are disclosed in this Proxy Statement, and there were no disclosed transactions for 2024.

Executive Officers

Our executive officers and their respective ages and positions as of March 27, 2025, are set forth below.

John J. Engelhas served as Chairman of the Board of Directors since May 2011 and as our President and Chief Executive Officer since 2009. Previously, Mr. Engel served as our Senior Vice President and Chief Operating Officer from 2004 to 2009. Before joining Wesco in 2004, Mr. Engel served as Senior Vice President and General Manager of Gateway, Inc., Executive Vice President and Senior Vice President of Perkin Elmer, Inc., Vice President and General Manager of Allied Signal, Inc., and also held various engineering, manufacturing and general management positions at General Electric Company.

David S. Schulzhas served as our Executive Vice President and Chief Financial Officer since June 2020, and from October 2016 to June 2020, he served as Senior Vice President and Chief Financial Officer. Prior to joining Wesco, Mr. Schulz served as Senior Vice President and Chief Operating Officer of Armstrong Flooring, Inc. from April 2016 to October 2016 and from November 2013 to March 2016, he served as Senior Vice President and Chief Financial Officer of Armstrong World Industries, Inc. and as Vice President, Finance of the Armstrong Building Products division from 2011 to November 2013. Prior to joining Armstrong World Industries in 2011, he held various financial leadership roles with Procter & Gamble and The J.M. Smucker Company. Mr. Schulz began his career as an officer in the United States Marine Corps.

James F. Cameronhas served as our Executive Vice President and General Manager of the Utility & Broadband Solutions (UBS) strategic business unit since June 2020. From January 2014 to June 2020 he was Vice President and General Manager of the Utility and Broadband Group, and from 2011 to 2013 he was Regional Vice President of our Utility business. Prior to joining Wesco in 2011, Mr. Cameron served as Senior Vice President of the Utility Group, and Vice President of Marketing & Operations with Irby, a Sonepar Company. Earlier in his career, Mr. Cameron held various positions with Hubbell Power Systems, Thomas & Betts and ABB.

William C. Geary, IIhas served as our Executive Vice President and General Manager of the Communications & Security Solutions (CSS) strategic business unit since June 2020. Prior to the merger with Anixter in 2020, Mr. Geary served as Executive Vice President - Network & Security Solutions of Anixter International Inc. from July 2017 to June 2020 and Senior Vice President - Global Markets - Network & Security Solutions from January 2017 to June 2017. Previously, Mr. Geary held a variety of senior management roles at Accu-Tech Corporation, a wholly-owned subsidiary of Anixter.

Akash Khuranahas served as our Executive Vice President and Chief Information and Digital Officer since joining the Company in November 2020. Before joining Wesco, Mr. Khurana served as Chief Information Officer and Chief Data Officer of Global information of McDermott International, Ltd. from March 2015 to November 2020. Previously, he served as Senior Director of Global Product Lines and Regional P&Ls at Baker Hughes and held a variety of leadership roles at GE Healthcare and Power & Water Divisions.

Diane E. Lazzarishas served as our Executive Vice President and General Counsel since June 2020 and also as Corporate Secretary from February 2021 to December 2023. From 2014 to June 2020 she served as Senior Vice President and General Counsel, and from 2010 to December 2013 she served as our Vice President, Legal Affairs. From 2008 to 2010, Ms. Lazzaris served as Senior Vice President - Legal, General Counsel and Corporate Secretary of Dick's Sporting Goods, Inc. From 1994 to 2008, she held various corporate counsel positions at Alcoa Inc., including Group Counsel to a group of global businesses.

Hemant Porwalhas served as our Executive Vice President, Supply Chain and Operations division since June 2020, and from January 2015 to June 2020 as Vice President of Global Supply Chain and Operations. Before joining Wesco, Mr. Porwal served as Vice President at Sears Holding Corporation, leading their global procurement function since 2011, and at PepsiCo, Inc. where he held roles with increasing responsibility in Operations, Supply Chain, Procurement and Finance.

Nelson J. Squires IIIhas served as our Executive Vice President and General Manager of the Electrical & Electronic Solutions (EES) strategic business unit since June 2020, and from October 2019 to June 2020 he served as our Senior Vice President and Chief Operating Officer. From January 2018 to September 2019 he served as Group Vice President and General Manager of Wesco Canada/International/WIS and as Group Vice President and General Manager of Wesco Canada from August 2015 to January 2018. From 2010 to July 2015, he was Vice President and General Manager, North America Merchant Gases and President, Air Products Canada of Air Products and Chemicals, Inc. He has also served in regional and general management positions, as Director of Investor Relations, and in various sales positions at Air Products. Earlier in his career, he was a Captain in the United States Army.

Christine A. Wolfhas served as our Executive Vice President and Chief Human Resources Officer since June 2020, and from June 2018 to June 2020 as Senior Vice President and Chief Human Resources Officer. Before joining Wesco from 2011 to June 2018, Ms. Wolf served as the Chief Human Resources Officer of Orbital ATK, Inc. until its acquisition by Northrop Grumman. From 2008 to 2011, she served as the Chief Human Resources Officer of Fannie Mae and from 2004 to 2008 she served as Chief Human Resources Officer of E*Trade Financial Corporation. Prior to that, she held various positions in human resources with companies in a variety of industries.

Proposal 2 - Approve, on an Advisory Basis, the Compensation of the Company's Named Executive Officers

This year, the Company is seeking that the stockholders approve the compensation of the Company's named executive officers (commonly referred to as "say-on-pay")as described in the "Compensation Discussion and Analysis" section, the tabular disclosure regarding named executive officer compensation and the narrative description accompanying such disclosure. As approved by our stockholders at the Annual Meeting of Stockholders in 2024 regarding the frequency of the advisory vote, and consistent with the Board's recommendation, we are submitting this proposal on an annual basis. This vote is advisory only, meaning it is non-bindingon the Company; however, the Board and Compensation Committee will review and carefully consider the results when evaluating future compensation decisions.

OUR BOARD UNANIMOUSLY RECOMMENDS A VOTE "FOR"

APPROVAL OF THE COMPENSATION OF THE COMPANY'S

NAMED EXECUTIVE OFFICERS.

The Board endorses the Company's executive compensation program and recommends that the stockholders vote in favor of the following resolution:

RESOLVED, that the stockholders approve the compensation of the Company's named executive officers as disclosed pursuant to Item 402 of SEC Regulation S-K,including as described under the "Compensation Discussion and Analysis" section, as well as the accompanying compensation tables and the related narrative disclosure, in the Company's 2025 Proxy Statement.

Compensation Discussion and Analysis

This Compensation Discussion and Analysis section discusses the Company's compensation philosophy, policies and arrangements for the 2024 year that are applicable to our Named Executive Officers ("NEOs"), who are listed below:

Executive Summary

Key elements of our executive compensation program include the following:

Pay for Performance

Our compensation program uses the following performance metrics:

2024 Highlights

Highlights for 2024 include:

Say-on-Pay

In addition to considering the needs of the business, the corporate governance landscape, the competitive marketplace and other trends, the Compensation Committee considers the results of the Say-on-Pay advisory vote in making compensation decisions for the following year. In 2024, the Company's advisory vote on executive compensation received the approval of approximately 97% of the shares voted. We believe that this substantial majority of votes cast affirms shareholders' recognition of our strong alignment of pay with performance.

Compensation Philosophy, Approach and Pay Elements

We have a straightforward and transparent compensation program that is linked to our strategy and the drivers of long-term stockholder value. It is based on our pay-for-performancemethodology, and we use operating performance metrics that are important to our business. To be successful, we need to attract and retain executives and employees who are talented and motivated to grow long-term stockholder value.

There are three central elements to our executive total compensation:

Structuring a balanced, fair and properly-crafted compensation program for our executive leaders is essential to promote our high-performance culture and contribute to our success. Our compensation philosophy begins with the recognition that our success depends on the talent of our people. To encourage high level performance of our leaders, we have constructed a compensation plan that rewards the behavior of our executives in pursuit of the following three broad philosophical tenets and goals:

In setting compensation levels, we annually review a range of market data to ensure that our pay is appropriately positioned as compared to other similarly situated executives. The actual positioning of target compensation relative to the market varies based on each executive's experience, skill set, performance and potential.

We assess the effectiveness of our compensation programs regularly and use the services of an independent compensation consultant, Meridian, which provides us with research information and data. Meridian serves as a resource to our Compensation Committee, providing information on new developments, best practices and trends in compensation. The Committee considers

information provided by Meridian, and then exercises its independent judgment to make plan design and compensation decisions. All of our Committee members are independent, as defined by applicable regulations.

Compensation Setting Process

Our Board has delegated to the Compensation Committee the responsibility of administering executive compensation and benefit programs, policies and practices. The Committee is composed entirely of individuals who are independent Directors under the independence standards of the NYSE and SEC, including the enhanced independence requirements for compensation committee members. The Committee may also delegate certain matters to a subcommittee in its discretion. The performance of the management team is reviewed relative to performance measures, and compensation levels for our NEOs are reviewed and approved on an annual basis.

Our compensation setting process for NEOs consists of the following steps:

In addition, the Committee has sought the recommendation of the Chief Executive Officer regarding the other NEOs relative to compensation adjustments and individual performance objectives he believes would be appropriate to achieve the Company's strategic and operational goals. The Committee reviews, discusses, modifies and approves, as appropriate, these compensation recommendations.

Role of Compensation Consultants

To assist in the compensation setting process, the Committee engages Meridian, an independent executive compensation consultancy firm, to provide information and advice regarding compensation and benefit levels and incentive plan designs. Meridian is engaged by and reports directly to the Committee, which has the sole authority to hire or fire Meridian and to approve fee arrangements for work performed. The Committee has authorized Meridian to interact with management on behalf of the Committee as needed in connection with advising the Committee. The Committee has assessed the independence of Meridian pursuant to SEC and NYSE rules and concluded that Meridian's work for the Committee does not raise any conflict of interest.

In particular, the Committee retains Meridian to prepare compensation plan reviews, identify general trends and practices in executive compensation programs, provide information on new developments, including regulatory and legislative updates, related to compensation, assist in selecting the appropriate peer group, prepare a market analysis of target total compensation for the NEOs based on comparable and similarly-sized(by revenue) companies, and furnish its input regarding the compensation and incentives of the Chief Executive Officer and other executives.

The Committee's Chairman meets with management and Meridian regularly throughout the course of the year. The Committee reports to the entire Board of Directors at every Board meeting on its activities, the research commissioned from our compensation consultant and on the Committee's specific compensation deliberations and decisions that directly affect our executive leadership team.

Compensation Peer Group

As part of our compensation review process, the Committee annually assesses the competitiveness of the target pay opportunities for each of our NEOs against similarly situated executives from a custom peer group of companies. The peer group, reviewed and approved annually by the Committee, generally reflects:

We chose a large number of similarly sized companies to ensure a proper sample size for comparison purposes and because we believe that they are representative of the companies against whom we compete to recruit and retain talent. This approach has proven successful, as many of the executive officers that we recently hired came from large corporations that were not direct competitors of ours and not in the distribution industry. Furthermore, it is not feasible or appropriate to construct a peer group of only distributor competitors, as many of our competitors are smaller and/or privately-held companies, in the case of local competitors, or larger non-U.S.based companies, in the case of global competitors. To adjust for a variation in size among our

Company and the companies in the peer group and to get comparable data for its analysis, Meridian uses regression analysis to adjust market values for differences in company size, based on annual revenues.

Our compensation peer group in 2024 comprises the following 26 companies:

The Committee reviews with Meridian the composition of our peer group annually to ensure that companies are relevant for comparative purposes. For 2024, based on a qualitative review of our peer group, the Committee added Parker-Hannifin Corporation to the peer group and removed CommScope Holding Company, Inc. and Univar Solutions Inc.

Elements of Compensation

Base Salaries

Base salaries are intended to provide our NEOs with a level of competitive cash compensation that is critical for retention and appropriate given their positions, responsibilities and accomplishments with the Company. Salaries for NEOs are reviewed annually. The Committee reviews detailed individual salary history for the NEOs and compares their base salaries to salaries for comparable positions at companies within our peer group.

In 2024, the Committee performed its annual assessment of base salaries in February. The Committee reviewed compensation market data, based on analysis prepared by Meridian, using our compensation peer group.

In determining adjustments to base salaries, the Committee considers individual performance assessments based on a robust leadership and organizational review process, Company performance, changes in duties and responsibilities, comparable salary practices of companies within our peer group, prevailing economic conditions, the recommendation of Mr. Engel (in the case of the other NEOs), and any other factors the Committee deems relevant.

Short-Term Incentives

Our practice is to award cash incentive bonuses for achievement of performance measures linked to our strategy. Short-term incentives are designed to provide pay-for-performancecompensation opportunities and are reviewed on an annual basis.

Each December, the Board reviews the Company's annual operating plan, including performance measures. Targets for the coming year's short-term incentives are consistent with the Board-approved annual operating plan, based on specified achievement levels. Additionally, the annual operating plan forms the basis of expectations that are provided to stockholders, in the form of sales and profitability expectations, as well as Free Cash Flow generation. Thus, management's STIP is aligned with stockholder interests and expectations communicated to stockholders.

Annually, the Company's performance criteria and financial and operational targets are reviewed and approved by the Committee for the upcoming year. For purposes of the 2024 annual incentive programs, the performance measures for our NEOs consist of the achievement of a combination of the following metrics: Earnings Before Interest Taxes Depreciation and Amortization ("EBITDA") and Free Cash Flow. For NEOs leading a Strategic Business Unit ("SBU"), including Messrs. Geary and Squires, the EBITDA component comprises both the EBITDA for the relevant SBU and for the Company on a consolidated basis. We believe that EBITDA is an appropriate performance measure because it relates directly to the Company's or SBU's sales growth (including organic sales growth), operating margin performance (including gross margin and cost management) and profitability. We believe that Free Cash Flow is an appropriate performance measure because it relates directly to the Company's operating performance, including the management of working capital. We believe that the combination of earnings growth and effective asset management drives value for a distribution and supply chain solutions business. Under the Company's annual incentive plan, the Committee may apply a performance modifier, based on the achievement of strategic initiatives, which may increase or decrease the calculated incentive amount under the plan by +/- 25%.

For 2024, the target incentive opportunity, and relative weight assigned to each performance measure for each of the NEOs, were as follows:

For 2024, the performance goals (at threshold, target and maximum levels) and the actual achievement of each of the financial components are included in the chart below:

With respect to the NEOs other than himself, the Chief Executive Officer makes recommendations to the Committee for the Committee's consideration. The Committee's review of the Chief Executive Officer's bonus is conducted with only independent Directors present, with the assistance of Meridian.

For 2024, the CEO recommended applying a 25% reduction to the overall annual cash-incentive payouts for all of the executive officers, including himself, to better align with the payouts received by the broader management population based on results of other key performance measures, and the Committee agreed to reduce the executive officers' overall payouts by 25%.