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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
1196898	P Richard Wallace	C/O Kla-Tencor Corporation One Technology Drive Milpitas CA 95035	President And Ceo	Yes	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
Common Stock	Acquisiton	2011-02-17	16,500	$45.25	72,234	No	4	M	Direct
Common Stock	Disposition	2011-02-17	30,643	$49.75	41,591	No	4	S	Direct
Common Stock	Acquisiton	2011-02-17	37,500	$0.00	79,091	No	4	A	Direct
Common Stock	Disposition	2011-02-17	16,330	$49.53	62,761	No	4	F	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	M	Direct
No	4	S	Direct
No	4	A	Direct
No	4	F	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	2011-02-17	16,500	$0.00	16,500	$45.25

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0		2011-10-02	No	4	M	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock - Restricted Stock Units	280,445	Direct

Footnotes

These sales were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on December 15, 2009, as modified on December 14, 2010.
On February 17, 2006, Mr. Wallace received a grant of restricted stock units ("RSUs") covering 75,000 shares of KLA-Tencor common stock. On February 17, 2011, Mr. Wallace vested in fifty percent (50%) of such RSUs.
Pursuant to the terms of the February 17, 2006 RSU grant, 16,330 shares of KLA-Tencor common stock were automatically withheld at vesting to cover required tax withholding. The fair market value of KLA-Tencor common stock used for purposes of calculating the number of shares to be withheld was the closing price of KLA-Tencor common stock as reported on the NASDAQ Stock Market on such vesting date.
Each 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 October 2, 2001, granting the Reporting Person the right to purchase up to 16,500 shares of KLA-Tencor common stock. One forty-eighth (1/48) of the 16,500 shares subject to this stock option vested on the 13-month anniversary of the grant date and each monthly anniversary thereafter until October 2, 2006.