X0306 4 2021-12-21 0 0000929008 WESCO INTERNATIONAL INC WCC 0001750504 Sundaram Easwaran 225 WEST STATION SQUARE DR. SUITE 700 PITTSBURGH PA 15219 1 0 0 0 Deferred Share Units 2021-12-21 4 A 0 1480.6231 0.00 A Common Stock 1480.6231 5700.4933 D Deferred share units ("DSUs") are credited to the Reporting Person's deferred compensation account pursuant to the Issuer's Deferred Compensation Plan for Non-Employee Directors (the "Plan"). Each DSU is the economic equivalent of one share of Issuer's common stock and is eligible for distribution in the form of Issuer's common stock based on the schedule elected by the Reporting Person in accordance with the Plan. /s/ Diane E. Lazzaris, as Attorney-in-Fact 2021-12-21