X0303 4 2010-07-01 0 0000929008 WESCO INTERNATIONAL INC WCC 0001246375 DUGANIER ALLAN A 225 WEST STATION SQUARE DRIVE SUITE 700 PITTSBURGH PA 15219 0 1 0 0 Director of Internal Audit Stock Appreciation Rights 33.05 2010-07-01 4 A 0 5734 0.00 A 2020-07-01 Common Stock 5734 5734 D Restricted Stock Units 2010-07-01 4 A 0 635 0.00 A Common Stock 635 635 D Subject to the terms and conditions of the related Stock Appreciation Rights Agreement, the Stock Appreciation Rights become exercisable in three equal, annual installments beginning on the first anniversary of the date of the grant. Each Restricted Stock Unit represents a contingent right to receive one share of WESCO Common Stock. Subject to the terms and conditions of the related Restricted Stock Unit Agreement, the Restricted Stock Units vest in three years from the date of the grant. /s/ Alessandra S. Michelini 2010-07-06