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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
319201	Kla Tencor Corp	KLAC	Optical Instruments & Lenses (3827)	042564110

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1430600	A Virendra Kirloskar	C/O Kla-Tencor Corporation One Technology Drive Milpitas CA 95035	Svp & Chief Accounting Officer	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2011-05-05	867	$39.89	8,106	No	4	M	Direct
Common Stock	Disposition	2011-05-05	3,399	$45.00	4,707	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Non-Qualified Stock Option (Right to Buy)	Disposition	2011-05-05	867	$0.00	867	$39.89

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0		2014-09-16	No	4	M	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock - Restricted Stock Units	38,150	Direct

Footnotes

These sales were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 7, 2011.
Each restricted stock unit ("RSU") represents a contingent right to receive one share of KLA-Tencor common stock.
Does not include performance-based RSUs, if any, held by the Reporting Person for which an assessment has not yet been made regarding the achievement of the applicable performance goals. Any such holdings will be reported on Form 4 within two business days of the date such assessment is made.
Represents a stock option granted on September 16, 2004, granting the Reporting Person the right to purchase up to 6,500 shares of KLA-Tencor common stock. 1,300 of the shares subject to this stock option vested on the two-year anniversary of the grant date, and 1/48 of the remaining 5,200 shares subject to this stock option vested on the 25-month anniversary of the grant date and each monthly anniversary thereafter until September 16, 2010.