UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 8-K Current Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 23, 2003 KLA-Tencor Corporation (Exact name of registrant as specified in its charter) 000-09992 (Commission File Number) Delaware 04-2564110 ---------------------------------------------- ---------------- (State or other jurisdiction of incorporation) (I.R.S. Employer Identification No.) 160 Rio Robles San Jose, California 95134 (Address of principal executive offices, with zip code) (408) 875-3000 (Registrant's telephone number, including area code) N/A (Former name or former address, if changed since last report) Item 7. Financial Statements and Exhibits. (c) Exhibits. Exhibit Description 99.1 Press Release issued by KLA-Tencor Corporation dated April 23, 2003. Item 9. Regulation FD Disclosure In accordance with Securities and Exchange Commission Release No. 33-8216, the following information, which is intended to be furnished under Item 12, "Results of Operations and Financial Condition," is instead being furnished under Item 9, "Regulation FD Disclosure." This information shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or otherwise subject to the liabilities under that Section. Furthermore, the information in this Current Report on Form 8-K, including the exhibit, shall not be deemed to be incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing. On April 23, 2003, KLA-Tencor Corporation, (the Company) issued a press release, the full text of which is furnished as Exhibit 99.1 to this report. -2- SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. KLA-TENCOR CORPORATION Date: April 23, 2003 By: /s/ John H. Kispert ----------------------------------- John H. Kispert Executive Vice President and Chief Financial Officer INDEX TO EXHIBITS Exhibit Description 99.1 Press Release issued by KLA-Tencor Corporation dated April 23, 2003.