X0202 3/A 2005-05-26 2005-05-27 0 0000929452 KNIGHT TRANSPORTATION INC KNX 0001293815 Comen Thomas Casey 5601 WEST BUCKEYE ROAD PHOENIX AZ 85043 0 0 0 1 Executive Vice President Common Stock, par value $0.01 per share 0 D Employee Stock Option (Right to Buy) 16.5467 2007-03-01 2014-02-28 Common Stock, par value $0.01 per share 37500 D Employee Stock Option (Right to Buy) 23.30 2007-05-16 2015-05-15 Common Stock, par value $0.01 per share 5000 D Employee Stock Option (Right to Buy) 27.13 2006-03-01 2015-02-28 Common Stock, par value $0.01 per share 10000 D This option will vest in five equal annual installments on March 1, 2007, 2008, 2009, 2010 and 2011. The previously reported vesting schedule contained a typographical error. The correct schedule for vesting is in 20% increments on May 26, 2007, May 26, 2008, May 26, 2009, May 26, 2010 and May 26, 2011. This option will vest in four (4) equal installments on March 1, 2006, March 1, 2007, March 1, 2008 and March 1, 2009. /s/ Casey Comen 2005-06-17