X0306 4 2016-02-15 0 0001021860 NATIONAL OILWELL VARCO INC NOV 0001614165 Duff Scott K. 7909 PARKWOOD CIRCLE DRIVE HOUSTON TX 77036 0 1 0 0 VP Cntrlr Chf Acctg Offcr Common Stock 2016-02-15 4 F 0 780 27.55 D 5749 D Common Stock 5700 I by 401 (k)Plan Represents the number of shares withheld from the vesting of time-based restricted stock shares to satisfy tax withholding liability. Represents the number of shares equivalent of NOV common stock held by Mr. Duff under the National Oilwell Varco, Inc. 401(k) Plan. The information in this report is based on Mr. Duff's account balance as of February 15, 2016. By: Brigitte M. Hunt For: Scott K. Duff 2016-02-16