National Oilwell Varco 2015 Annual Report Download - page 120

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Exhibit 32.1
CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350
In connection with the Annual Report of National Oilwell Varco, Inc. (the “Company) on Form 10-K for the year ended December 31, 2015 as filed with the
Securities and Exchange Commission on the date hereof (the “Report”), I, Clay C. Williams, Chairman, President and Chief Executive Officer of the
Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to my knowledge:
(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and
(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.
Date: February 19, 2016 By: /s/ Clay C. Williams
Clay C. Williams
Chairman, President and Chief Executive Officer
1