X0306 4 2020-09-17 0 0000929008 WESCO INTERNATIONAL INC WCC 0001592539 Schulz David S. 225 WEST STATION SQUARE DRIVE SUITE 700 PITTSBURGH PA 15219 0 1 0 0 EVP & CFO Series A Preferred Stock 2020-09-17 4 P 0 1771 28.23 A 1771 D Common Stock 2020-09-17 4 P 0 1136.363 44.00 A 26674.363 D Each stock represents a 1/1,000th interest in a share of newly issued fixed-rate reset cumulative perpetual WESCO preferred stock, Series A, $25,000. These shares are generally not convertible into or exchangeable for any other property or securities of WESCO. However, upon the occurrence of a WESCO change of control involving the issuance of additional shares of WESCO common stock or other WESCO change of control transaction, in each case, approved by holders of WESCO common stock, a holder of these shares will have the right, subject to certain limited exceptions, to convert some or all of these shares on the change of control conversion date into a number of shares of WESCO common stock pursuant to a conversion formula. /s/ Samantha L. O'Donoghue, Attorney-in-Fact 2020-09-18