Company: WCC
Filing Date: 2025-03-27
Form Type: PRE 14A
Source: 0001193125-25-065641
Chunk: 0

Company: WESCO INTERNATIONAL INC
Filing Date: 2025-03-27
Form: PRE 14A
Chunk 0
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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A 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 Rule14a-6(e)(2)) |

| ☐ | Definitive Proxy Statement |

| ☐ | Definitive Additional Materials |

| ☐ | Soliciting Material under§240.14a-12 |

WESCO INTERNATIONAL, INC. (Name of Registrant as Specified In Its Charter) (Name of Person(s) Filing Proxy Statement, if other than the Registrant) Payment of Filing Fee (Check all boxes that apply):

| ☒ | No fee required |

| ☐ | Fee paid previously with preliminary materials |

| ☐ | Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules14a-6(i)(1)and0-11 |

#### 2025 PROXY STATEMENT

#### and Notice of Annual Meeting of Stockholders
| WESCO INTERNATIONAL, INC. 225 West Station Square Drive, Suite 700 Pittsburgh, Pennsylvania 15219-1122 |

Notice of 2025 Annual Meeting of Stockholders

| When:        
 Where:       |     | Thursday, May 22, 2025 at 2:00 p.m., E.D.T.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
 This year’s Annual Meeting of Stockholders will be conducted exclusively as a virtual meeting via live audio webcast. You are invited to attend the Annual Meeting by visiting https://www.virtualshareholdermeeting.com/WCC2025, where you will be able to listen to the meeting live, submit questions and vote online.   To join the meeting, you will need the 16-digit control number received with your Notice Regarding the Availability of Proxy Materials. When accessing our Annual Meeting, please allow ample time for online check-in, which will begin at 1:45 p.m., E.D.T., on Thursday, May 22, 2025. |
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| Record Date: |     | March 27, 2025                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |

Dear Fellow Stockholders: I am pleased