X0201 4 2004-03-16 0 0000929008 WESCO INTERNATIONAL INC WCC 0001212354 VAN OSS STEPHEN A 225 WEST STATION SQUARE DRIVE, SUITE 700 PITTSBURGH PA 15219 0 1 0 0 VICE PRESIDENT & CFO WESCO International Common Stock 88465.0000 D Option for WESCO International Common Stock 4.3400 2007-11-26 WESCO International Common Stock 60112.0000 60112.0000 D Option for WESCO International Common Stock 10.7500 2008-08-06 WESCO International Common Stock 69360.0000 129472.0000 D Option for WESCO International Common Stock 9.8750 2010-05-11 WESCO International Common Stock 27500.0000 156972.0000 D Option for WESCO International Common Stock 9.3125 2010-10-23 WESCO International Common Stock 22500.0000 179472.0000 D Option for WESCO International Common Stock 4.5000 2011-12-21 WESCO International Common Stock 50000.0000 229472.0000 D Option for WESCO International Common Stock 5.9000 2013-08-22 WESCO International Common Stock 70000.0000 299472.0000 D Option for WESCO International Common Stock 4.3400 2004-03-16 2004-03-16 4 X 0 300.0000 15.0500 D 1998-06-05 2007-11-26 WESCO International Common Stock 300.0000 299172.0000 D Option for WESCO International Common Stock 4.3400 2004-03-16 2004-03-16 4 X 0 200.0000 15.0300 D 1998-06-05 2007-11-26 WESCO International Common Stock 200.0000 298972.0000 D Option for WESCO International Common Stock 4.3400 2004-03-16 2004-03-16 4 X 0 1800.0000 15.0000 D 1998-06-05 2007-11-26 WESCO International Common Stock 1800.0000 297172.0000 D Option for WESCO International Common Stock 4.3400 2004-03-16 2004-03-16 4 X 0 600.0000 14.9800 D 1998-06-05 2007-11-26 WESCO International Common Stock 600.0000 296572.0000 D Option for WESCO International Common Stock 4.3400 2004-03-16 2004-03-16 4 X 0 1400.0000 14.9600 D 1998-06-05 2007-11-26 WESCO International Common Stock 1400.0000 295172.0000 D Option for WESCO International Common Stock 4.3400 2004-03-17 2004-03-17 4 X 0 6700.0000 15.0000 D 1998-06-05 2007-11-26 WESCO International Common Stock 6700.0000 288472.0000 D Option for WESCO Internationa Common Stock 4.3400 2004-03-17 2004-03-17 4 X 0 200.0000 15.0300 D 1998-06-05 2007-11-26 WESCO International Common Stock 200.0000 288272.0000 D Option for WESCO International Common Stock 4.3400 2004-03-17 2004-03-17 4 X 0 3000.0000 15.0500 D 1998-06-05 2007-11-26 WESCO International Common Stock 3000.0000 285272.0000 D Option for WESCO International Common Stock 4.3400 2004-03-17 2004-03-17 4 X 0 100.0000 15.1000 D 1998-06-05 2007-11-26 WESCO International Common Stock 100.0000 285172.0000 D Option for WESCO International Common Stock 4.3400 2004-03-17 2004-03-17 4 X 0 2500.0000 15.1500 D 1998-06-05 2007-11-26 WESCO International Common Stock 2500.0000 282672.0000 D Option for WESCO International Common Stock 4.3400 2004-03-17 2004-03-17 4 X 0 700.0000 15.2500 D 1998-06-05 2007-11-26 WESCO International Common Stock 700.0000 281972.0000 D Options 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 Oss 2004-03-18