144 0001428491 XXXXXXXX LIVE 0000929008 WESCO INTERNATIONAL INC 001-14989 225 WEST STATION SQUARE DRIVE STE 700 PITTSBURGH PA 15219 4124542200 Lazzaris Diane Officer Common Charles Schwab Corp.

3000 Schwab Way Westlake TX 76262

7522 1965122.50 48646230 11/04/2025 NYSE Common 07/02/2023 Vesting of Restricted Stock Unit Issuer N 7057 07/02/2023 N/A Common 02/11/2024 Vesting of Restricted Stock Unit Issuer N 465 02/11/2024 N/A N Diane Ellen Lazzaris

225 WEST STATION SQARE DRIVE SUITE 700 PITTSBURGH PA 15219

Common 08/26/2025 3160 714995.00 Diane Ellen Lazzaris

225 WEST STATION SQARE DRIVE SUITE 700 PITTSBURGH PA 15219

Common 08/28/2025 4260 966040.00 11/04/2025 DIANE ELLEN LAZZARIS