EXHIBIT 99.1

                             APPLIED MATERIALS, INC.
                  SARBANES-OXLEY ACT SECTION 906 CERTIFICATION

In connection with this quarterly report on Form 10-Q/A of Applied Materials,
Inc. for the period ended April 27, 2003, I, Michael R. Splinter, President and
Chief Executive Officer of Applied Materials, Inc., hereby certify pursuant to
18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley
Act of 2002, that:

         1.   this Form 10-Q/A for the period ended April 27, 2003 fully
              complies with the requirements of section 13(a) or 15(d) of the
              Securities Exchange Act of 1934; and

         1.   the information contained in this Form 10-Q/A for the period ended
              April 27, 2003 fairly presents, in all material respects, the
              financial condition and results of operations of Applied
              Materials, Inc. for the periods presented therein.

Date: June 11, 2003
                                                       /S/ MICHAEL R. SPLINTER
                                                       -------------------------

                                                       Michael R. Splinter
                                                       President and
                                                       Chief Executive Officer

A signed original of this written statement required by Section 906 has been
provided to Applied Materials, Inc. and will be retained by Applied Materials,
Inc. and furnished to the Securities and Exchange Commission or its staff upon
request.