X0306 4 2020-01-01 0 0000889900 PATTERSON UTI ENERGY INC PTEN 0001241697 HUNT TERRY H 1500 SPRING MILL LANE VILLANOVA PA 19085 1 0 0 0 Common Stock, $.01 par value per share 2020-01-01 4 A 0 16666 0.00 A 91670 D Common Stock, $.01 par value per share 2020-01-02 4 S 0 5900 10.49 D 85770 D Restricted stock units that convert into common stock on a one-for-one basis. One hundred percent (100%) of the restricted stock units vests on January 1, 2021. Shares sold pursuant to a Rule 10b5-1 Sales Plan whereby the reporting person committed to sell the shares on or about January 2, 2020 for the purpose of funding the reporting person's estimated cash tax liability in connection with the vesting of restricted stock units on January 1, 2020. Weighted average price. Actual sales prices ranged from $10.33 to $10.68. By Barry Huntsman pursuant to a Limited Power of Attorney filed with the SEC on 01/02/2014. /s/Barry Huntsman 2020-01-03