X0306 4 2021-08-12 0 0000929008 WESCO INTERNATIONAL INC WCC 0001816354 Cameron James 225 W STATION SQUARE DRIVE SUITE 700 PITTSBURGH PA 15219 0 1 0 0 EVP & GM, Util & Broadband Common Stock 2021-08-12 4 S 0 999 119.59 D 9202 D Common Stock 2021-08-12 4 M 0 1340 64.33 A 10542 D Common Stock 2021-08-12 4 D 0 732 117.81 D 9810 D Common Stock 2021-08-12 4 F 0 265 117.81 D 9545 D Common Stock 2021-08-12 4 M 0 1278 72.15 A 10823 D Common Stock 2021-08-12 4 D 0 783 117.81 D 10040 D Common Stock 2021-08-12 4 F 0 216 117.81 D 9824 D Common Stock 2021-08-12 4 M 0 2039 85.35 A 11863 D Common Stock 2021-08-12 4 D 0 1478 117.81 D 10385 D Common Stock 2021-08-12 4 F 0 244 117.81 D 10141 D Common Stock 2021-08-13 4 S 0 939 117.57 D 9202 D Stock Appreciation Rights 64.33 2021-08-12 4 M 0 1340 0.00 D 2022-02-16 Common Stock 1340 0 D Stock Appreciation Rights 72.15 2021-08-12 4 M 0 1278 0.00 D 2023-02-21 Common Stock 1278 0 D Stock Appreciation Rights 85.35 2021-08-12 4 M 0 2039 0.00 D 2024-02-18 Common Stock 2039 0 D All shares sold at the price of $119.59. All shares sold at the price of $117.57. The Stock Appreciation Rights became excisable in three (3) equal, annual installments beginning on the first anniversary of the February 16, 2012 grant date. The Stock Appreciation Rights became excisable in three (3) equal, annual installments beginning on the first anniversary of the February 21, 2013 grant date. The Stock Appreciation Rights became excisable in three (3) equal, annual installments beginning on the first anniversary of the February 18, 2014 grant date. /s/ Diane E. Lazzaris, as Attorney-in-Fact 2021-08-16