Document



Delaware	04-2564110
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

One Technology Drive, Milpitas, California	95035
(Address of Principal Executive Offices)	(Zip Code)

Amended and Restated 1997 Employee Stock Purchase Plan
(Full title of the plan)

Teri A. Little
Senior Vice President, Corporate Secretary and General Counsel
KLA-Tencor Corporation
One Technology Drive, Milpitas, California 95035
(Name and address of agent for service)

(408) 875-3000
(Telephone number, including area code, of agent for service)

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company,” and "emerging growth company" in Rule 12b-2 of the Exchange Act.
Large Accelerated Filer þ	Accelerated Filer ¨
Non-accelerated filer ¨ (Do not check if a smaller reporting company)	Smaller reporting company ¨
	Emerging growth company ¨
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act. ¨



CALCULATION OF REGISTRATION FEE

Title of securities to be registered	Amount to be registered⁽¹⁾⁽²⁾	Proposed maximum offering price per share		Proposed maximum aggregate offering price		Amount of registration fee
Common Stock, par value $0.001 per share	2,000,000	$	77.87	$	155,740,000	$	18,050.27

(1) Pursuant to Rule 416(a) of the Securities Act of 1933, as amended, this Registration Statement shall also cover any additional shares of the Registrant’s common stock that become issuable under the Amended and Restated 1997 Employee Stock Purchase Plan (the “ESPP”) by reason of any stock dividend, stock split, recapitalization or other similar transaction effected without receipt of consideration that increases the number of the Registrant’s outstanding shares of common stock.

(2) Reflects an automatic increase to the number of shares of Registrant’s Common Stock reserved for issuance under the ESPP, which increase is provided for in the ESPP.

(3) Estimated in accordance with paragraphs (c) and (h) of Rule 457 under the Securities Act solely for the purpose of calculating the registration fee on the basis of 85% of $91.605, which represents the average of the high and low price per share of the Registrant’s common stock on August 2, 2017 as reported on the Nasdaq Global Select Market. Pursuant to the ESPP, the purchase price of the shares of the Registrant’s common stock reserved for issuance thereunder will be at least 85% of the lower of the fair market value on (i) the first trading day of the offering period or (ii) the purchase date.

This Registration Statement on Form S-8 is being filed by KLA-Tencor Corporation (the “Registrant”) with the Securities and Exchange Commission (the “Commission”) for the purpose of registering an additional 2,000,000 shares of the Registrant’s common stock, par value $0.001 per share, for issuance pursuant to the Registrant's Amended and Restated 1997 Employee Stock Purchase Plan. In accordance with General Instruction E to Form S-8, the contents of Registration Statement No. 333-198006, filed with Commission on August 8, 2014, are incorporated herein by reference.

(3) The description of the Registrant’s Common Stock as set forth in the Registration Statement filed by the Registrant on Form 8-A on March 29, 1989 (File No. 000-09992) pursuant to Section 12(g) of the Securities Exchange Act of 1934, as amended (the “1934 Act”), and any amendments or reports thereto filed with the SEC for the purpose of updating such description, including Amendment No. 1 to Form 8-A filed September 25, 1995 and Amendment No. 2 to Form 8-A filed September 24, 1996.

All documents filed by the Registrant pursuant to Sections 13(a), 13(c), 14 and 15(d) of the Exchange Act on or after the date of this Registration Statement and prior to the filing of a post-effective amendment to this Registration Statement that indicate that all securities offered have been sold or that deregisters all securities then remaining unsold shall be deemed to be incorporated by reference in this Registration Statement and to be a part hereof from the date of filing of such documents; provided, however, that documents or information deemed to have been furnished and not filed in accordance with the rules of the Commission shall not be deemed incorporated by reference into this Registration Statement.

Any statement contained in a document incorporated or deemed to be incorporated by reference herein shall be deemed to be modified or superseded for purposes of this Registration Statement to the extent that a statement contained herein or in any other subsequently filed document which also is or is deemed to be incorporated by reference herein modifies or supersedes such statement. Any such statement so modified or superseded shall not be deemed, except as so modified or superseded, to constitute a part of this Registration Statement.



		Incorporated by Reference
Exhibit Number	Description	Form	Exhibit	File No.	Filing Date	Filed Herewith
5.1	Opinion of Jeffrey S. Cannon, Esq.					X
23.1	Consent of Independent Registered Public Accounting Firm					X
23.2	Consent of Jeffrey S. Cannon, Esq. (included in Exhibit 5.1)
24.1	Power of Attorney (included on signature page)
99.1	Amended and Restated 1997 Employee Stock Purchase Plan					X

Pursuant to the requirements of the Securities Act of 1933, as amended, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Milpitas, State of California, on the 4th day of August, 2017.

That the undersigned officers and directors of KLA-Tencor Corporation, a Delaware corporation, do hereby constitute and appoint Bren D. Higgins and Teri A. Little or any one of them, the lawful attorney-in-fact and agent, each with full power and authority to do any and all acts and things and to execute any and all instruments which said attorney and agent determines may be necessary or advisable or required to enable said corporation to comply with the Securities Act of 1933, as amended, and any rules or regulations or requirements of the Securities and Exchange Commission in connection with this Registration Statement. Without limiting the generality of the foregoing power and authority, the powers granted include the power and authority to sign the names of the undersigned officers and directors in the capacities indicated below to this Registration Statement, to any and all amendments, both pre-effective and post-effective, and supplements to this Registration Statement, and to any and all instruments or documents filed as part of or in conjunction with this Registration Statement or amendments or supplements thereof, and each of the undersigned hereby ratifies and confirms all that said attorneys and agents, or any one of them, shall do or cause to be done by virtue hereof. This Power of Attorney may be signed in several counterparts.



Signature	Title	Date

/s/ Richard P. Wallace	President, Chief Executive Officer and Director (principal executive officer)	August 3, 2017
RICHARD P. WALLACE		August 3, 2017

/s/ Bren D. Higgins	Executive Vice President and Chief Financial Officer (principal financial officer)	August 3, 2017
BREN D. HIGGINS		August 3, 2017

/s/ Virendra A. Kirloskar	Senior Vice President and Chief Accounting Officer (principal accounting officer)	August 3, 2017
VIRENDRA A. KIRLOSKAR		August 3, 2017

/s/ Edward W. Barnholt	Chairman of the Board	August 3, 2017
EDWARD W. BARNHOLT	Chairman of the Board	August 3, 2017

	Director
ROBERT M. CALDERONI	Director

/s/ John T. Dickson	Director	August 3, 2017
JOHN T. DICKSON	Director	August 3, 2017

/s/ Emiko Higashi	Director	August 3, 2017
EMIKO HIGASHI	Director	August 3, 2017

/s/ Kevin J. Kennedy	Director	August 3, 2017
KEVIN J. KENNEDY	Director	August 3, 2017

/s/ Gary B. Moore	Director	August 3, 2017
GARY B. MOORE	Director	August 3, 2017

/s/ Kiran M. Patel	Director	August 3, 2017
KIRAN M. PATEL	Director	August 3, 2017

/s/ Robert A. Rango	Director	August 3, 2017
ROBERT A. RANGO	Director	August 3, 2017

/s/ David C. Wang	Director	August 3, 2017
DAVID C. WANG	Director	August 3, 2017



		Incorporated by Reference
Exhibit Number	Description	Form	Exhibit	File No.	Filing Date	Filed Herewith
5.1	Opinion of Jeffrey S. Cannon, Esq.					X
23.1	Consent of Independent Registered Public Accounting Firm					X
23.2	Consent of Jeffrey S. Cannon, Esq. (included in Exhibit 5.1)
24.1	Power of Attorney (included on signature page)
99.1	Amended and Restated 1997 Employee Stock Purchase Plan					X



	KLA-TENCOR CORPORATION

	By: /s/ Teri A. Little
	Name: Teri A. Little
	Title: Senior Vice President and General Counsel