Item 8.01. Other Events.

On October 5, 2006, ADE Corporation, or ADE, and KLA-Tencor Corporation, or KLA-Tencor, announced that the acquisition of ADE by KLA-Tencor has received the approval of German antitrust authorities and that the previously announced Phase II investigation of the acquisition has been closed. The acquisition has already been cleared by the antitrust authorities in the United States and in all other applicable jurisdictions. In addition, ADE’s stockholders approved the acquisition on July 13, 2006. The parties expect the merger to close on October 11, 2006.

Cautionary Statement Regarding Forward-Looking Statements

This Current Report on Form 8-K contains certain forward-looking statements within the meaning of the “safe harbor” provisions of the United States Private Securities Litigation Reform Act of 1995 and federal securities law. Such forward-looking statements are subject to known and unknown risks and uncertainties that could cause actual results to differ materially from those expressed or implied by such statements. Those statements that make reference to expectations, predictions, beliefs and assumptions should be considered forward-looking statements. These statements include, but are not limited to, those associated with the expected closing time for the proposed merger. These statements involve risks and uncertainties including those associated with failure to consummate or delays in consummating the proposed merger, changes in laws or regulations and other similar factors. Further information on potential factors that could affect ADE’s business is contained in its reports on file with the Securities and Exchange Commission, including its Annual Report on Form 10-K. Except as otherwise required by applicable law, ADE is under no obligation to (and expressly disclaims any such obligation to) update or alter its forward-looking statements whether as a result of new information, future events or otherwise.