SEC FORM 3 SEC Form 3
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
or Section 30(h) of the Investment Company Act of 1940
 
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1. Name and Address of Reporting Person*
Bell Bobby R

(Last) (First) (Middle)
C/O KLA-TENCOR CORPORATION
ONE TECHNOLOGY DRIVE

(Street)
MILPITAS CA 95035

(City) (State) (Zip)
2. Date of Event Requiring Statement (Month/Day/Year)
08/05/2010
3. Issuer Name and Ticker or Trading Symbol
KLA TENCOR CORP [ KLAC ]
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 of 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
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
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: 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
Explanation of Responses:
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.
Brian M. Martin as Attorney-In-Fact for Bobby R. Bell 08/09/2010
** Signature of Reporting Person Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* 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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
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Exhibit 24.1

Limited Power of Attorney - Securities Law Compliance

This statement confirms that the undersigned, as an officer, director or beneficial
owner of more than 10% of any class of any equity security of KLA-Tencor Corporation
(the ?Corporation?), hereby appoints Brian Martin (in his role as corporate secretary) and
Jeffrey Eisenberg (in his role as corporate assistant secretary), and each of them, the
undersigned?s true and lawful attorney-in-fact and agent to:

1.	complete and execute Forms 3, 4 and 5 and other forms (including any
amendments thereto) as such attorney-in-fact shall in his discretion determine to be
required or advisable pursuant to Section 16 of the Securities Exchange Act of 1934 (as
amended) and the rules and regulations promulgated thereunder, or any successor laws
and regulations, as a consequence of the undersigned?s ownership, acquisition or
disposition of securities of the Corporation; and

2.	to do all acts necessary in order to file such forms with the Securities and
Exchange Commission, any securities exchange or national association, that the
Corporation and such other person or agency as the attorney-in-fact shall deem
appropriate.

The undersigned hereby ratifies and confirms all that said attorneys-in-fact and agents
shall do or cause to be done by virtue hereof.  The undersigned acknowledges that the
foregoing attorneys-in-fact, in serving in such capacity at the request of the undersigned,
are not assuming, nor is the Corporation assuming, any of the undersigned?s
responsibilities to comply with Section 16 of the Securities Exchange Act of 1934 (as
amended).  This Limited Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file Forms 3, 4 and 5 with respect to the
undersigned?s ownership of and transactions in securities of the Corporation, unless
earlier revoked by the undersigned in a signed writing delivered to the Corporation and
the foregoing attorneys-in-fact.

This Limited Power of Attorney is executed at Milpitas, California as of the date
set forth below.

Signature: /s/ Bobby R. Bell
Print Name: Bobby R. Bell
Dated: August 5, 2010

Witness Signature: /s/ Lisa Cianciarulo
Print Name: Lisa Cianciarulo
Dated: August 5, 2010