Company: WCC
Filing Date: 2025-04-10
Form Type: DEFA14A
Source: 0001193125-25-078099
Chunk: 0

Company: WESCO INTERNATIONAL INC
Filing Date: 2025-04-10
Form: DEFA14A
Chunk 0
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UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 14A (RULE 14a-101) SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box:

| ☐ | Preliminary Proxy Statement |

| ☐ | Confidential, for Use of the Commission Only (as permitted by Rule 
 14a-6(e)(2))                                                       |

| ☐ | Definitive Proxy Statement |

| ☒ | Definitive Additional Materials |

| ☐ | Soliciting Material Pursuant to Section 240.14a-12 |

WESCO INTERNATIONAL, INC. (Name of Registrant as Specified In Its Charter) (Name of Person(s) Filing Proxy Statement) Payment of Filing Fee (Check the appropriate box):

| ☒ | No fee required. |

| ☐ | Fee paid previously with preliminary materials. |

| ☐ | Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11. |

Your Vote Counts! WESCO INTERNATIONAL, INC. 2025 Annual Meeting Vote by May 21, 2025 11:59 PM ET. For shares held in a Plan, vote by May 19, 2025 11:59 PM ET. WESCO INTERNATIONAL, INC. 225 WEST STATION SQ. DR. SUITE 700 PITTSBURGH, PA 15219 ATTN: CORPORATE SECRETARY V68717-P25959 You invested in WESCO INTERNATIONAL, INC. and it’s time to vote! You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy materials for the stockholder meeting to be held on May 22, 2025. Get informed before you vote View the Notice and Proxy Statement and Annual Report online OR you can receive a free paper or email copy of the material(s) by requesting prior to May 8, 2025. If you would like to request a copy of the material(s) for this and/or future stockholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to sendmaterial@proxyvote.com. If sending an