04-HP-876_10K.qxd 12/15/04 2:43 PM Page 27 Certification of CEO and CFO Pursuant to 18 U.S.C. Section 1350, As Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 In connection with the Annual Report of Helmerich & Payne, Inc. (the “Company”) on Form 10-K for the period ending September 30, 2004 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), Hans Helmerich, as Chief Executive Officer of the Company, and Douglas E. Fears, as Chief Financial Officer of the Company, each hereby certifies, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the best of his knowledge, that: (1) The Repor fully complies with the requirements of Section 13(a) of the Securities Exchange Act of 1934; and (2) The information contained in the Repor fairly presents, in all material respects, the financial condition and result of operations of the Company. /s/ Douglas E. Fears Douglas E. Fears Chief Financial Officer December 13, 2004 /s/ Hans Helmerich Hans Helmerich Chief Executive Officer December 13, 2004 24