UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON DC 20549 FORM 10-Q/A AMENDMENT NO. 1 TO (Mark One) /X/ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 1994 OR / / TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO -------------------- -------------------- Commission file number 0-9992 KLA INSTRUMENTS CORPORATION (Exact name of registrant as specified in its charter) Delaware 04-2564110 (State of incorporation) (IRS Employer Identification Number) 160 Rio Robles San Jose, California 95134 (408) 434-4200 (Address and telephone number of principal executive offices) --------------- Indicate by check mark whether registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. YES /X/ NO ---- ---- SECURITIES REGISTERED PURSUANT TO SECTION 12(G) OF THE ACT: Common Stock, $0.001 par value Common Stock Purchase Rights Common shares outstanding at September 30, 1994: 23,054,000 THIS AMENDMENT 10-Q/A CONTAINS 4 PAGES. FORM 10-Q/A AMENDMENT The registrant hereby amends Part II Item 6 EXHIBITS AND REPORTS ON FORM 8-K, by filing herewith Exhibit 27, 1995 First Quarter Financial Data Schedule. 2 SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this amendment to be signed on its behalf by the undersigned, thereunto duly authorized. KLA INSTRUMENTS CORPORATION By: /s/ William Turner ----------------------------------- William Turner Vice President/Corporate Controller Date: December 15, 1994 3