X0202 4 2004-06-04 0 0000054991 KEITHLEY INSTRUMENTS INC KEI 0001198928 ROSICA GABRIEL A KEITHLEY INSTRUMENTS, INC. 28775 AURORA ROAD SOLON OH 44139 0 1 0 0 Executive Vice President Common Shares 2004-06-04 4 M 0 10000.0000 2.5313 A 10000.0000 D Common Shares 2004-06-04 4 S 0 9900.0000 20.5000 D 100.0000 D Common Shares 2004-06-04 4 S 0 100.0000 20.6900 D 0 D Common Stock Option 5.7188 1999-09-20 2007-09-19 Common Stk 12500.0000 12500.0000 D Common Stock Option 2.5313 2004-06-04 4 M 0 10000.0000 0 D 2000-09-12 2008-09-11 Common Stk 21000.0000 11000.0000 D Common Stock Option 3.8125 2001-02-14 2009-02-13 Common Stk 30000.0000 30000.0000 D Common Stock Option 4.1250 2001-07-17 2009-07-16 Common Stk 58000.0000 58000.0000 D Common Stock Option 45.1250 2002-08-02 2010-08-01 Common Stk 55000.0000 55000.0000 D Common Stock Option 18.4100 2003-07-25 2006-07-25 Common Stk 60000.0000 60000.0000 D Common Stock Option 13.7600 2004-07-24 2012-07-23 Common Stk 30000.0000 30000.0000 D Phantom Stock Units 2005-09-09 2005-09-09 Common Stk 1826.5900 1826.5900 D Date reported applies to 50% of total, one-half of the balance is then exercisable in each succeeding year. Phantom shares were acquired on various dates (beginning 09/19/1995) with prices ranging from $2.469 to $64.00 The phantom stock units were accrued under the Keithley Instruments, Inc. Deferred Stock Plan and are to be settled in common stock to the reporting person upon the exercisable date. Mark J. Plush, Attorney-in Fact 2004-06-07