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Date of Report (Date of earliest event reported): December 5, 2025

(Exact name of registrant as specified in its charter)

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Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

On December 5, 2025, the Board of Directors of WESCO International, Inc. (the “Company”) elected Michael L. Carter and David C. Wajsgras as Directors, effective January 1, 2026. The Board has determined that Messrs. Carter and Wajsgras are independent directors under New York Stock Exchange listing standards. Their compensation for service as non-employee Directors will be consistent with that of the Company’s other non-employee Directors, which is described under the heading “Director Compensation” in the Company’s definitive proxy statement filed with the Securities and Exchange Commission on April 10, 2025. Mr. Carter currently serves as the Executive Vice President and Chief Partner Officer of Truist Financial Corporation. He previously served as Head of Corporate and Investment Banking at Truist Securities. Mr. Wajsgras is the former Chief Executive Officer of Intelsat Holdings S.A. and currently serves as a director of Parsons Corporation and Martin Marietta Materials, Inc. A copy of the press release issued by the Company with additional information about Messrs. Carter and Wajsgras and announcing their elections to the Board of Directors is attached hereto as Exhibit 99.1 and incorporated by reference.

In accordance with the Director retirement age policy in the Company’s Corporate Governance Guidelines, Bobby Griffin will retire from the Board when his term expires at the Company’s 2026 annual meeting of stockholders on May 28, 2026. His retirement is not due to any disagreement with the Company. On December 5, 2025, Steven Raymund notified the Company of his retirement from the Board of Directors, effective upon the scheduled expiration of his term at the 2026 annual meeting of stockholders on May 28, 2026. His retirement is not due to any disagreement with the Company and is part of the Company’s long-standing commitment to ongoing Board refreshment following the process described under the heading “Board Refreshment and Tenure” in the Proxy Statement. Additional information regarding the retirements of Messrs. Griffin and Raymund is also included in the press release referenced above and attached hereto.

(d) Exhibits.

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.