Company: WCC
Filing Date: 2025-04-10
Form Type: DEF 14A
Source: 0001193125-25-078098
Chunk: 3

Company: WESCO INTERNATIONAL INC
Filing Date: 2025-04-10
Form: DEF 14A
Chunk 3
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 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.

| Wesco 2025 Proxy Statement |     | Questions and Answers |     | 2 |

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,