X0201 42003-08-2200000929008WESCO INTERNATIONAL INC WCC0001212354VAN OSS STEPHEN A225 WEST STATION SQUARE DRIVE, SUITE 700PITTSBURGHPA152190100VICE PRESIDENT & CFOWESCO International Common Stock88465DOption for WESCO International Common Stock4.342007-11-26WESCO International Common Stock6011260112DOption for WESCO International Common Stock10.752008-08-06WESCO International Common Stock69360129472DOption for WESCO International Common Stock9.8752010-05-11WESCO International Common Stock27500156972DOption for WESCO International Common Stock9.31252010-10-23WESCO International Common Stock22500179472DOption for WESCO International Common Stock4.52011-12-21WESCO International Common Stock50000229472DOption for WESCO International Common Stock5.92003-08-224A0700005.9A2013-08-22WESCO International Common Stock70000299472DOptions are vested and fully exercisable.Half of the option grant vested over a four year time period from the grant date, while the remaining half are subject to performance vesting, with any unvested options becoming fully vested on 1/1/2008.Option grant is subject to accellerated vesting upon achievement of performance targets, with cliff vesting of any unvested options 90 days prior to the expiration of the options.Options vest at a rate of 1/3 on the anniversary date of the option grant over the next three years./s/ Stephen A. Van Oss2003-08-26