Ownership Submission
FORM 3
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF 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 *
  Bell Bobby R
2. Date of Event Requiring Statement (Month/Day/Year)
08/05/2010
3. Issuer Name and Ticker or Trading Symbol
KLA TENCOR CORP [KLAC]
(Last)
(First)
(Middle)
C/O KLA-TENCOR CORPORATION, ONE TECHNOLOGY DRIVE
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Executive Vice President
5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

MILPITAS, CA 95035
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 Beneficially Owned
1.Title of Security
(Instr. 4)
2. Amount of Securities Beneficially Owned
(Instr. 4)
3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)
4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Common Stock 27,812
D
 
Common Stock - Restricted Stock Units 129,733
D
 

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)
2. Date Exercisable and Expiration Date
(Month/Day/Year)
3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)
4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)
6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Non-Qualified Stock Option (Right to Buy) 07/10/2001(1) 07/10/2011 Common Stock 5,000 $ 46.67 D  
Non-Qualified Stock Option (Right to Buy) 07/10/2001(1) 07/10/2011 Common Stock 1,740 $ 46.67 D  
Non-Qualified Stock Option (Right to Buy) 08/13/2001(1) 07/10/2011 Common Stock 8,260 $ 46.67 D  
Non-Qualified Stock Option (Right to Buy) 11/10/2001(1) 07/10/2011 Common Stock 4,083 $ 46.67 D  
Non-Qualified Stock Option (Right to Buy) 02/19/2002(1) 07/10/2011 Common Stock 4,791 $ 46.67 D  
Non-Qualified Stock Option (Right to Buy) 04/04/2002(1) 07/10/2011 Common Stock 3,666 $ 46.67 D  
Non-Qualified Stock Option (Right to Buy) 11/08/2003(1) 11/08/2012 Common Stock 1,354 $ 37.05 D  
Non-Qualified Stock Option (Right to Buy) 11/08/2003(1) 01/28/2013 Common Stock 542 (2) $ 34.67 D  
Non-Qualified Stock Option (Right to Buy) 11/08/2003(1) 07/30/2013 Common Stock 3,250 $ 51.229 D  
Non-Qualified Stock Option (Right to Buy) 10/27/2004(1) 10/27/2013 Common Stock 6,200 $ 53.86 D  
Non-Qualified Stock Option (Right to Buy) 10/27/2004(1) 01/27/2014 Common Stock 3,100 $ 58.1 D  
Non-Qualified Stock Option (Right to Buy) 10/27/2004(1) 04/26/2014 Common Stock 3,875 $ 45.16 D  
Non-Qualified Stock Option (Right to Buy) 10/27/2004(1) 08/02/2014 Common Stock 2,325 $ 40.66 D  
Non-Qualified Stock Option (Right to Buy) 01/04/2005(1) 07/10/2011 Common Stock 1,334 $ 53.35 D  
Non-Qualified Stock Option (Right to Buy) 01/08/2005(1) 11/08/2012 Common Stock 1,896 $ 37.43 D  
Non-Qualified Stock Option (Right to Buy) 01/10/2005(1) 07/10/2011 Common Stock 917 $ 53.35 D  
Non-Qualified Stock Option (Right to Buy) 01/19/2005(1) 07/10/2011 Common Stock 209 $ 53.35 D  
Non-Qualified Stock Option (Right to Buy) 09/16/2005(1) 09/16/2014 Common Stock 20,500 $ 39.89 D  
Non-Qualified Stock Option (Right to Buy) 09/02/2006(1) 10/02/2011 Common Stock 600 $ 45.25 D  
Non-Qualified Stock Option (Right to Buy) 09/16/2006(3) 09/16/2014 Common Stock 10,250 $ 39.89 D  
Non-Qualified Stock Option (Right to Buy) 09/26/2006(3) 09/26/2012 Common Stock 17,000 $ 47.95 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Bell Bobby R
C/O KLA-TENCOR CORPORATION
ONE TECHNOLOGY DRIVE
MILPITAS, CA 95035
      Executive Vice President  

Signatures

Brian M. Martin as Attorney-In-Fact for Bobby R. Bell 08/09/2010
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(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) This option is fully-vested and exercisable.
(2) An option to purchase 6,500 shares was originally granted. As of the date hereof, 5,958 shares have been exercised.
(3) Twenty percent (20%) of the shares subject to this option became exercisable on this date, and the remaining shares became (or will become) exercisable in equal monthly installments over the subsequent 48 months.

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