Item 2.02. Results of Operations and Financial Condition.

On March 7, 2006, ADE Corporation, or ADE, issued a press release reporting its financial results for the three and nine months ended January 31, 2006. The press release is attached hereto as Exhibit 99.1.

Item 9.01. Financial Statements and Exhibits.

This press release, which has been furnished solely for Item 2.02, shall not be deemed filed for the purpose of Section 18 of the Securities Exchange Act of 1934, as amended, or the Exchange Act, or otherwise incorporated by reference into any filing pursuant to the Securities Act of 1933, as amended, or the Exchange Act.

Additional Information and Where to Find It

This document may be deemed to be solicitation material in respect of the proposed business combination of KLA-Tencor Corporation, or KLA, and ADE. In connection with the proposed transaction, a registration statement on Form S-4 will be filed by KLA with the SEC. STOCKHOLDERS OF ADE ARE ENCOURAGED TO READ THE REGISTRATION STATEMENT AND ANY OTHER RELEVANT DOCUMENTS FILED WITH THE SEC, INCLUDING THE PROXY STATEMENT/PROSPECTUS THAT WILL BE PART OF THE REGISTRATION STATEMENT, BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION ABOUT THE PROPOSED TRANSACTION. The final proxy statement/prospectus will be mailed to stockholders of ADE and stockholders may obtain a free copy of the disclosure documents (when they become available) and other documents filed by ADE and KLA with the SEC at the SEC’s website at www.sec.gov, from ADE Corporation, 80 Wilson Way, Westwood, Massachusetts 02090, Attention: Chief Financial Officer, or from KLA, 160 Rio Robles, San Jose, California 95134, Attention: General Counsel.

KLA, ADE and their respective directors and executive officers and other members of management and employees may be deemed to participate in the solicitation of proxies in respect of the proposed transactions. Information regarding KLA directors and executive officers is available in KLA’s proxy statement for its 2005 annual meeting of stockholders, which was filed with the SEC on October 13, 2005, and information regarding ADE’s directors and executive officers is available in ADE’s annual report on Form 10-K for the year ended April 30, 2005, and its proxy statement for its 2005 annual meeting of stockholders, which were filed with the SEC on July 26 and August 19, 2005, respectively. Additional information regarding the interests of such potential participants will be included in the proxy statement/prospectus and the other relevant documents filed with the SEC when they become available.