shall not be incorporated by reference into any registration statement or other document pursuant to the Securities Act of 1933, as amended. On July 30, 2026, WESCO International, Inc. (the “Company”) issued a press release announcing its financial results for the second quarter of 2026. A copy of the press release is attached hereto as Exhibit 99.1.

Executive Vice President and Chief Financial Officer — David S. Schulz: Mr. Schulz retired from his role and entered into a consulting agreement with the company.

shall not be incorporated by reference into any registration statement or other document pursuant to the Securities Act of 1933, as amended. On April 30, 2026, WESCO International, Inc. (the “Company”) issued a press release announcing its financial results for the first quarter of 2026. A copy of the press release is attached hereto as Exhibit 99.1.

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. The disclosure set forth in

Entry into a Material Definitive Agreement. On February 27, 2026, WESCO Distribution, Inc. (the “Issuer” or “Wesco Distribution”), a wholly owned subsidiary of WESCO International, Inc. (the “Company” or “WESCO”), completed its previously announced offering (the “Offering”) to eligible purchasers of $650 million aggregate principal amount of 5.250% senior notes due 2031 (the “5-Year Notes”) and $850 million aggregate principal amount of 5.500% senior notes due 2034 (the “8-Year Notes” and, to…

Other Events. On February 24, 2026, WESCO International, Inc. (the “Company”) announced that its wholly owned subsidiary, WESCO Distribution, Inc. (the “Issuer”), commenced and subsequently priced a private offering (the “Offering”) to eligible purchasers, subject to market and other conditions, of $650 million aggregate principal amount of 5.250% senior notes due 2031 (the “5-Year Notes”) and $850 million aggregate principal amount of 5.500% senior notes due 2034 (the “8-Year Notes” and, tog…

Executive Vice President and Chief Financial Officer — Indraneel 'Neel' Dev: David S. Schulz transitioned to a special advisor role and will retire, while Indraneel 'Neel' Dev was promoted to CFO.

shall not be incorporated by reference into any registration statement or other document pursuant to the Securities Act of 1933, as amended. On February 10, 2026, WESCO International, Inc. (the “Company”) issued a press release announcing its financial results for the fourth quarter and full year 2025. A copy of the press release is attached hereto as Exhibit 99.1.

Chief Financial Officer — David S. Schulz: David S. Schulz plans to retire as CFO in May 2026, with a successor already named.

Director — Michael L. Carter: The filing announces the election of two new independent directors and the scheduled retirement of two existing directors as part of routine board refreshment, with no indication of a sudden executive departure or disagreement.

shall not be incorporated by reference into any registration statement or other document pursuant to the Securities Act of 1933, as amended. On October 30, 2025, WESCO International, Inc. (the “Company”) issued a press release announcing its financial results for the third quarter of 2025. A copy of the press release is attached hereto as Exhibit 99.1.

Director — Mr. Squires: The filing discloses a negotiated release and severance agreement for Mr. Squires, indicating a departure from the company, likely from a director or officer role given the context of Item 5.02.

Termination of a Material Definitive Agreement. As described below under Item 5.02, Mr. Nelson J. Squires, III, Executive Vice President and General Manager, Electrical & Electronics Solutions of WESCO International, Inc. (the “Company”) will receive certain severance benefits pursuant to a Release Agreement (the “Release”) that the Company entered into with him on September 10, 2025. The severance benefits are in accordance with the employment letter agreement between the Company and Mr. Squ…

Executive Vice President — Nelson Squires: The filing discloses the retirement of an Executive Vice President with the immediate appointment of a named successor, indicating an orderly succession rather than a sudden loss of leadership.

shall not be incorporated by reference into any registration statement or other document pursuant to the Securities Act of 1933, as amended. On July 31, 2025, WESCO International, Inc. (the “Company”) issued a press release announcing its financial results for the second quarter of 2025. A copy of the press release is attached hereto as Exhibit 99.1.

Executive Vice President — William C. Geary, II: The resignation of an Executive Vice President is accompanied by the immediate appointment of a named successor, indicating an orderly succession rather than a sudden loss of leadership.

shall not be incorporated by reference into any registration statement or other document pursuant to the Securities Act of 1933, as amended. On May 1, 2025, WESCO International, Inc. (the “Company”) issued a press release announcing its financial results for the first quarter of 2025. A copy of the press release is attached hereto as Exhibit 99.1.

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. The disclosure set forth in

Entry into a Material Definitive Agreement. Senior Notes Offering On March 6, 2025, WESCO Distribution, Inc. (the “Issuer” or “Wesco Distribution”), a wholly owned subsidiary of WESCO International, Inc. (the “Company” or “WESCO”), completed its previously announced offering (the “Offering”) to eligible purchasers of $800 million aggregate principal amount of 6.375% senior notes due 2033 (the “Notes”). The Notes were issued at a price of 100.000% of the aggregate principal amount thereof. The…

Other Events. On February 25, 2025, WESCO International, Inc. (the “Company”) announced that its wholly owned subsidiary, WESCO Distribution, Inc. (the “Issuer”), commenced and subsequently priced a private offering (the “Offering”) to eligible purchasers, subject to market and other conditions, of $800 million aggregate principal amount of 6.375% senior notes due 2033 (the “Notes”). The aggregate principal amount of the Notes to be issued in the Offering has been increased from the previousl…

shall not be incorporated by reference into any registration statement or other document pursuant to the Securities Act of 1933, as amended. On February 11, 2025, WESCO International, Inc. (the “Company”) issued a press release announcing its financial results for the fourth quarter and full year 2024. A copy of the press release is attached hereto as Exhibit 99.1.

shall not be incorporated by reference into any registration statement or other document pursuant to the Securities Act of 1933, as amended. On October 31, 2024, WESCO International, Inc. (the “Company”) issued a press release announcing its financial results for the third quarter of 2024. A copy of the press release is attached hereto as Exhibit 99.1.

shall not be incorporated by reference into any registration statement or other document pursuant to the Securities Act of 1933, as amended. On August 1, 2024, WESCO International, Inc. (the “Company”) issued a press release announcing its financial results for the second quarter of 2024. A copy of the press release is attached hereto as Exhibit 99.1.

Other Events. On May 20, 2024, WESCO Distribution, Inc., a Delaware corporation and wholly owned subsidiary (the “Issuer”) of WESCO International, Inc., elected to exercise its optional redemption right to redeem the entire outstanding $1,500 million aggregate principal amount of 7.125% Senior Notes due 2025 of the Issuer (the “Notes”), and U.S. Bank Trust Company, National Association, as successor to U.S. Bank National Association, as trustee under the indenture governing the Notes, issued…

shall not be incorporated by reference into any registration statement or other document pursuant to the Securities Act of 1933, as amended. On May 2, 2024, WESCO International, Inc. (the “Company”) issued a press release announcing its financial results for the first quarter of 2024. A copy of the press release is attached hereto as Exhibit 99.1.