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| Date | Name | Ticker | Shares | Change | Value | Change | Price |
| 09/30/2010 | KEITHLEY INSTRUMENTS INC | KEI | 107,700 | 0 | 2,317,000 | 1,366,000 | $21.51 |
| 06/30/2010 | KEITHLEY INSTRUMENTS INC | KEI | 107,700 | 107,700 | 951,000 | 951,000 | $8.83 |
| 09/30/2007 | KEITHLEY INSTRUMENTS INC | KEI | 0 | -45,528 | 0 | -571,000 | |
| 06/30/2007 | KEITHLEY INSTRUMENTS INC | KEI | 45,528 | 45,528 | 571,000 | 571,000 | $12.54 |
| 03/31/2007 | KEITHLEY INSTRUMENTS INC | KEI | 45,528 | 45,528 | 696,000 | 696,000 | $15.29 |
| 06/30/2006 | KEITHLEY INSTRUMENTS INC | KEI | 0 | -13,100 | 0 | -201,000 | |
| 03/31/2006 | KEITHLEY INSTRUMENTS INC | KEI | 13,100 | 13,100 | 201,000 | 201,000 | $15.34 |
| 12/31/2005 | KEITHLEY INSTRUMENTS INC | KEI | 13,500 | 13,500 | 189,000 | 189,000 | $14.00 |
| 09/30/2005 | KEITHLEY INSTRUMENTS INC | KEI | 13,500 | 13,500 | 197,000 | 197,000 | $14.59 |
| 06/30/2005 | KEITHLEY INSTRUMENTS INC | KEI | 91,500 | 91,500 | 1,410,000 | 1,410,000 | $15.41 |
| 03/31/2005 | KEITHLEY INSTRUMENTS INC | KEI | 86,400 | 86,400 | 1,394,000 | 1,394,000 | $16.13 |
| 12/31/2004 | KEITHLEY INSTRUMENTS INC | KEI | 77,700 | 77,700 | 1,531,000 | 1,531,000 | $19.70 |
| 09/30/2004 | KEITHLEY INSTRUMENTS INC | KEI | 56,400 | 56,400 | 984,000 | 984,000 | $17.45 |
| 06/30/2004 | KEITHLEY INSTRUMENTS INC | KEI | 36,000 | 36,000 | 797,000 | 797,000 | $22.14 |
| 03/31/2004 | KEITHLEY INSTRUMENTS INC | KEI | 36,700 | 36,700 | 760,000 | 760,000 | $20.71 |
| 12/31/2003 | KEITHLEY INSTRUMENTS INC | KEI | 42,200 | 42,200 | 772,000 | 772,000 | $18.29 |
| 09/30/2003 | KEITHLEY INSTRUMENTS INC | KEI | 58,800 | 58,800 | 832,000 | 832,000 | $14.15 |
| 06/30/2003 | KEITHLEY INSTRUMENTS INC | KEI | 16,300 | 16,300 | 236,000 | 236,000 | $14.48 |
| 03/31/2003 | KEITHLEY INSTRUMENTS INC | KEI | 16,300 | 16,300 | 176,000 | 176,000 | $10.80 |
| 12/31/2002 | KEITHLEY INSTRUMENTS INC | KEI | 16,900 | 16,900 | 211,000 | 211,000 | $12.49 |
| 09/30/2002 | KEITHLEY INSTRUMENTS INC | KEI | 16,900 | 16,900 | 205,000 | 205,000 | $12.13 |
| 06/30/2002 | KEITHLEY INSTRUMENTS INC | KEI | 29,500 | 29,500 | 426,000 | 426,000 | $14.44 |
| 03/31/2002 | KEITHLEY INSTRUMENTS INC | KEI | 30,800 | 30,800 | 677,000 | 677,000 | $21.98 |
| 12/31/2001 | KEITHLEY INSTRUMENTS INC | KEI | 15,900 | 15,900 | 269,000 | 269,000 | $16.92 |
| 09/30/2001 | KEITHLEY INSTRUMENTS INC | KEI | 20,800 | 20,800 | 298,000 | 298,000 | $14.33 |
| 06/30/2001 | KEITHLEY INSTRUMENTS INC | KEI | 18,900 | 18,900 | 403,000 | 403,000 | $21.32 |
| 03/31/2001 | KEITHLEY INSTRUMENTS INC | KEI | 27,400 | 27,400 | 444,000 | 444,000 | $16.20 |
| 12/31/2000 | KEITHLEY INSTRUMENTS INC | KEI | 33,100 | 33,100 | 1,425,000 | 1,425,000 | $43.05 |
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