Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
PLUSH MARK J
  2. Issuer Name and Ticker or Trading Symbol
KEITHLEY INSTRUMENTS INC [KEI]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
VP, CFO
(Last)
(First)
(Middle)
KEITHLEY INSTRUMENTS, INC., 28775 AURORA ROAD
3. Date of Earliest Transaction (Month/Day/Year)
11/09/2007
(Street)

SOLON, OH 44139
4. If Amendment, Date Original Filed(Month/Day/Year)
6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)
4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)
6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)
7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Common Shares               34,775 D  
Restricted Shares (1)               4,528 D  
Common Shares               1,280 I Trust (2)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)
5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)
6. Date Exercisable and Expiration Date
(Month/Day/Year)
7. Title and Amount of Underlying Securities
(Instr. 3 and 4)
8. Price of Derivative Security
(Instr. 5)
9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)
10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)
11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Common Share Option $ 45.125             08/02/2002(3) 08/01/2010 Common Shares 42,000 (4)   42,000 (4) D  
Common Share Option $ 18.41             07/25/2003(5) 07/24/2011 Common Shares 38,000 (6)   38,000 (6) D  
Common Share Option $ 13.76             07/24/2004(3) 07/23/2012 Common Shares 25,029   25,029 D  
Common Share Option $ 16.12             08/10/2005(7) 07/18/2013 Common Shares 33,000   33,000 D  
Common Share Option $ 18.75             02/15/2005(5) 07/16/2014 Common Shares 28,000   28,000 D  
Common Share Option $ 15.05             10/04/2007(3) 10/03/2015 Common Shares 10,400   10,400 D  
Performance Award Unit $ 0             09/30/2008(8)   (8) Common Shares 8,000 (8)   8,000 (8) D  
Common Share Option $ 9.12 11/09/2007   A   12,700   11/09/2009(3) 11/09/2017 Common Shares 12,700 $ 0 12,700 D  
Performance Award Unit $ 0 11/09/2007   A   9,600 (8)   09/30/2010(8)   (8) Common Shares 9,600 (8) $ 0 9,600 (8) D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
PLUSH MARK J
KEITHLEY INSTRUMENTS, INC.
28775 AURORA ROAD
SOLON, OH 44139
      VP, CFO  

Signatures

 Mark J. Plush   11/13/2007
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) Restricted Shares will become fully vested on June 1, 2011
(2) Christopher M. Plush Trust, Virginia A. Plush Trustee
(3) Date reported applies to 50% of total, one-half of the balance is then exercisable in each succeeding year.
(4) Pursuant to a domestic relations order, the reporting person is deemed to hold 20,231 options for his former spouse and may exercise the option solely upon the direct of his former spouse who is entitled to the shares issued upon exercise. The reporting person disclaims beneficial ownership with respect to the options held for the benefit of his former spouse.
(5) Option became fully vested on February 15, 2005
(6) Pursuant to a domestic relations order, the reporting person is deemed to hold 16,251 options for his former spouse and may exercise the option solely upon the direct of his former spouse who is entitled to the shares issued upon exercise. The reporting person disclaims beneficial ownership with respect to the options held for the benefit of his former spouse.
(7) Option became fully vested on August 10, 2005
(8) 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.

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