Company: WCC
Filing Date: 2025-04-10
Form Type: DEF 14A
Source: 0001193125-25-078098
Chunk: 77

Company: WESCO INTERNATIONAL INC
Filing Date: 2025-04-10
Form: DEF 14A
Chunk 77
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 operations |

These resources could be better directed toward operating our business and creating long-term value for all stockholders. The 25% threshold helps prevent unnecessary meetings about matters that:

| • |     | are substantially similar to items recently considered |

| • |     | will be addressed at an upcoming annual meeting |

| • |     | lack broad stockholder support |

| • |     | could be more efficiently addressed through our regular stockholder engagement program |

Strong Existing Governance Framework– We maintain robust corporate governance practices that promote Board accountability and protect stockholder interests, including:

| • |     | 100% of our Audit, Compensation, and Nominating & Governance Committee members are independent, and 90% of our Board members are independent |

| • |     | strong lead independent director role |

| • |     | regular stockholder engagement program |

| • |     | annual election of directors |

| • |     | annual say-on-pay vote |

| • |     | annual review and evaluation of the Board by the Nominating & Governance Committee |

Implementation– This proposal is not binding upon the Company or our Board. Notwithstanding the non-bindingnature of this vote, our Board values the opinions expressed by stockholders in their vote on this proposal and will consider the outcome of the vote when considering whether to implement this Proposal 5 or the Board’s Proposal 3. As detailed in Proposal 3, if both this shareholder proposal and the Board’s proposal receive sufficient votes for approval, and Proposal 3 receives more affirmative votes than this proposal, the Company will amend our Restated Certificate of Incorporation to implement the 25% threshold. The Board strongly believes that the 25% threshold outlined in Proposal 3 better serves the interests of all stockholders and encourages stockholders to vote FOR Proposal 3 while voting AGAINST Proposal 5. OUR BOARD UNANIMOUSLY RECOMMENDS A VOTE “AGAINST” THIS PROPOSAL 5 REQUESTING A 10% THRESHOLD FOR CALLING SPECIAL MEETINGS AND A VOTE “FOR” MANAGEMENT’S PROPOSAL TO PROVIDE THE 25% THRESHOLD DESCRIBED IN PROPOSAL 3

| Ingenuity delivered. |     | Wesco.com   WESCO International, Inc. 225 West Station Square Drive, Suite 700 Pittsburgh, PA 15219 412.454.2200 |

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