Company: WCC
Filing Date: 2025-06-17
Form Type: 11-K
Source: 0000929008-25-000018
Chunk: 0

Company: WESCO INTERNATIONAL INC
Filing Date: 2025-06-17
Form: 11-K
Chunk 0
---
### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549

#### FORM 11-K
(Mark One)

<div align='center'>OR</div>

| o |     | TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 |
|   |     | For the transition period fromto                                                   |

#### Commission file number
1-14989

A. Full title of the plan and address of the plan, if different from that of the issuer named below:

#### WESCO DISTRIBUTION, INC. RETIREMENT SAVINGS PLAN
B. Name of issuer of the securities held pursuant to the plan and the address of its principal executive office:

#### WESCO International, Inc.
<div align='center'>225 West Station Square Drive

Suite 700

Pittsburgh, Pennsylvania 15219-1122</div>

<div align='center'>Table of Contents</div>

| I. FINANCIAL STATEMENTS                                                                                                                                                                                                                        |     |      |
|                                                                                                                                                                                                                                                |     | Page |
| Report of Independent Registered Public Accounting Firm                                                                                                                                                                                        |     |    1 |
| Financial Statements:                                                                                                                                                                                                                          |     |      |
| Statements of Net Assets Available for Benefits as of December 31, 2024and 2023                                                                                                                                                                |     |    2 |
| Statements of Changes in Net Assets Available for Benefits for the Years Ended                                                                                                                                                                 |     |      |
| December 31, 2024and 2023                                                                                                                                                                                                                      |     |    3 |
| Notes to Financial Statements                                                                                                                                                                                                                  |     |    4 |
| Supplemental Schedules:                                                                                                                                                                                                                        |     |      |
| Schedule H (Form 5500), line 4(i) - Schedule of Assets (Held at End of Year) as ofDecember 31, 2024*                                                                                                                                           |     |   13 |
| Signatures                                                                                                                                                                                                                                     |     |   14 |
| * Other schedules required by Section 2520.103-10 of the Department of Labor’s Rules and Regulations for Reporting and Disclosure under the Employee Retirement Income Security Act of 1974 have been omitted because they are not applicable. |     |      |
| II. EXHIBITS                                                                                                                                                                                                                                   |     |      |
| Exhibit 23 – Consent of Independent Registered Public Accounting Firm                                                                                                                                                                          |     |      |

<div align='center'>Report of Independent Registered Public Accounting