X0202 4 2004-07-16 0 0000054991 KEITHLEY INSTRUMENTS INC KEI 0001232685 GAFFNEY ALAN S KEITHLEY INSTRUMENTS, INC. 28775 AURORA ROAD SOLON OH 44139 0 1 0 0 VP Commercial Mkt & CIO Common Shares 2003-09-30 4 J 0 2 14.23 A 697 D Common Shares 2003-12-31 4 J 0 1 18.76 A 698 D Common Shares 2004-01-06 4 J 0 377 10.625 A 1075 D Common Shares 2004-03-31 4 J 0 2 20.73 A 1077 D Common Shares 2004-06-30 4 J 0 2 21.8835 A 1079 D Common Share Option 4.125 2001-07-17 2009-07-16 Common Shares 2000 2000 D Common Share Option 19.9688 2002-04-06 2010-04-05 Common Shares 6000 6000 D Common Share Option 45.125 2002-08-02 2010-08-01 Common Shares 8000 8000 D Common Share Option 18.41 2003-07-25 2011-07-24 Common Shares 15000 15000 D Common Share Option 13.76 2004-07-24 2012-07-23 Common Shares 25000 25000 D Common Share Option 16.12 2005-07-19 2013-07-18 Common Shares 28000 28000 D Common Share Option 18.75 2004-07-16 4 A 0 24000 0.00 A 2006-07-17 2014-07-16 Common Shares 24000 24000 D Acquired through Employee Stock Purchase and Dividend Reinvestment Plan. Date reported applies to 50% of total, one-half of the balance is then exercisable in each succeeding year Mark J. Plush, Attorney-in Fact 2004-07-19