X0306 4 2020-12-17 0 0000929008 WESCO INTERNATIONAL INC WCC 0001192868 ESPE MATTHEW J 225 WEST STATION SQUARE DRIVE SUITE 700 PITTSBURGH PA 15219 1 0 0 0 Deferred Share Units 2020-12-17 4 A 0 1515.7924 0.00 A Common Stock 1515.7924 4195.2471 D Deferred Share Units are credited to an account in the reporting person's name maintained by WESCO International. Each Deferred Share Unit is the economic equivalent of one share of WESCO International Common Stock. The Deferred Share Unit Account balance becomes eligible for distribution, only in the form of WESCO International Common Stock, as follows: 912.6406 in January 2022; 731.2749 in January 2023; 1,035.5392 in January 2024; and 1,515.7924 upon termination of service as a Director /s/ Samantha L. O'Donoghue, Attorney-In-Fact 2020-12-17