PHILADELPHIA, Aug. 3 /PRNewswire/ -- The law firm of Kohn, Swift & Graf, P.C. announces that a class action shareholder lawsuit has been commenced against KLA-Tencor Corporation ("KLA" or the "Company") . The lawsuit, filed in the United States District Court for the Northern District of California, seeks damages for violations of federal securities laws on behalf of all investors who purchased KLA securities between June 30, 2001 and May 22, 2006 (the "Class Period").

The Complaint alleges that KLA and certain current and prior officers and directors manipulated the prices of stock option grants and made materially false and misleading statements and/or omitted material facts necessary to make those statements not misleading. The Complaint alleges violations of Sections 10(b), 14(a) and 20(a) of the Securities Exchange Act of 1934, 15 U.S.C. Sections 78j(b), 78n(a), and 78t(a) and Rules 10b-5 and 14a-9 promulgated thereunder, 17 C.F.R. Section 240.10b-5 and 240.14a-9.

When the truth about the Company's stock options backdating first emerged publicly on May 22, 2006, KLA's stock price fell as a result, from a close of $45.24 per share on May 19, 2006 to a close of $39.07 per share on May 23, 2006.

If you bought the securities of KLA during the Class Period, and sustained damages, you may, no later than August 28, 2006, request that the Court appoint you as lead plaintiff. A lead plaintiff is a representative party that acts on behalf of other class members in directing the litigation. In order to be appointed lead plaintiff, the Court must determine that the class member's claim is typical of the claims of other class members, and that the class member will adequately represent the class. Under certain circumstances, one or more class members may together serve as "lead plaintiff." Your ability to share in any recovery is not, however, affected by the decision whether or not to serve as a lead plaintiff. You may retain Kohn, Swift & Graf, P.C., or other counsel of your choice, to serve as your counsel in this action.

If you wish to discuss this action or have any questions concerning this notice or your rights or interests with respect to these matters, please contact Denis F. Sheils, Esq. or William E. Hoese, Esq. at Kohn, Swift & Graf, P.C., by e-mail at dsheils@kohnswift.com or whoese@kohnswift.com, by calling (215) 238-1700, by fax at (215) 238-1968, or by writing to Kohn, Swift & Graf, P.C., One South Broad Street, Suite 2100, Philadelphia, PA 19107. You can also visit http://www.kohnswift.com/.

Contact: Kohn, Swift & Graf, P.C. Denis F. Sheils, Esquire William E. Hoese, Esquire (215) 238-1700 Fax: (215) 238-1968 http://www.kohnswift.com/

CONTACT: Denis F. Sheils, Esquire or William E. Hoese, Esquire, both of
Kohn, Swift & Graf, P.C., +1-215-238-1700, Fax: +1-215-238-1968

Web site: http://www.kohnswift.com/