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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
54991	Keithley Instruments Inc	KEI	Instruments For Meas & Testing Of Electricity & Elec Signals (3825)	340794417

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1073329	P Joseph Keithley	Keithley Instruments, Inc. 28775 Aurora Road Solon OH 44139	Director, Chairman, Ceo	Yes	Yes	Yes	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Common Shares	Acquisiton	2010-02-04	500	$5.47	137,840	No	4	P	Direct
Common Shares	Acquisiton	2010-02-04	300	$5.48	138,140	No	4	P	Direct
Common Shares	Acquisiton	2010-02-04	700	$5.50	138,840	No	4	P	Direct
Common Shares	Acquisiton	2010-02-05	312	$5.50	139,152	No	4	P	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	P	Direct
No	4	P	Direct
No	4	P	Direct
No	4	P	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Class B Common Shares	1,954,816	Indirect	Partnership
Class B Common Shares	46,062	Indirect	Trust
Class B Common Shares	130,000	Direct
Restricted Common Shares	1,308	Direct
Common Shares	2,448	Indirect	Wife

Reported Derivative Holdings

Sec. Name	Sec. Type	Price	Date	Expiration Date	Amount	Remaning Holdings	Nature of Ownership
Common Shares	Common Share Option	$45.13	2002-08-02	2010-08-01	120,000	120,000	Direct
Common Shares	Common Share Option	$18.41	2003-07-25	2011-07-24	100,000	100,000	Direct
Common Shares	Common Share Option	$13.76	2004-07-24	2012-07-23	100,000	100,000	Direct
Common Shares	Common Share Option	$16.12	2005-08-10	2013-07-18	100,000	100,000	Direct
Common Shares	Common Share Option	$18.75	2005-02-15	2014-07-16	70,000	70,000	Direct
Common Shares	Common Share Option	$15.05	2007-10-04	2015-10-03	55,000	55,000	Direct
Common Shares	Common Share Option	$9.12	2009-11-09	2017-11-09	38,300	38,300	Direct
Common Shares	Performance Award Unit	$0.00	2010-09-30		19,300	19,300	Direct

Expiration Date	Amount	Remaning Holdings	Nature of Ownership
2010-08-01	120,000	120,000	Direct
2011-07-24	100,000	100,000	Direct
2012-07-23	100,000	100,000	Direct
2013-07-18	100,000	100,000	Direct
2014-07-16	70,000	70,000	Direct
2015-10-03	55,000	55,000	Direct
2017-11-09	38,300	38,300	Direct
	19,300	19,300	Direct

Footnotes

Keithley Investment Co. Limited Partnership
Joseph F. Keithley 1988 Family Trust - reporting person is Trustee
The purchases reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 8, 2009.
Restricted shares will become fully vested on December 1, 2010
Date reported applies to 50% of total, one-half of the balance is then exercisable in each succeeding year.
Each Performance Award Unit represents the right to receive one common share. The number of units initially awarded, the target, is shown above. The actual number of units that will be awarded and converted to shares is based upon: a) the Company's revenue growth as compared to a defined Peer Group and, b) the Company maintaining an acceptable level of profitability during the performance period which ends on the date exercisable (the "vesting date"). Awarded units are automatically converted to shares under the Plan on or before the December 31st following the Vesting Date.