X0306 4 2019-01-09 0 0000889900 PATTERSON UTI ENERGY INC PTEN 0000919501 SIEGEL MARK S 1801 CENTURY PARK EAST SUITE 1111 LOS ANGELES CA 90067 1 1 0 0 Chairman of the Board Common Stock, $.01 par value per share 2019-01-09 5 G 0 E 33500 0.00 D 1367024 D Common Stock, $.01 par value per share 2019-01-09 5 G 0 E 33500 0.00 A 83400 I By Trust(s) Common Stock, $.01 par value per share 2019-04-23 4 A 0 33100 0.00 A 1400124 D Common Stock, $.01 par value per share 2019-04-23 4 F 0 10094 15.83 D 1390030 D Common Stock, $.01 par value per share 2019-04-23 4 A 0 69600 0.00 A 1459630 D Common Stock, $.01 par value per share 2019-04-24 4 F 0 17565 15.83 D 1442065 D Common Stock, $.01 par value per share 605000 I See Footnote The reporting person gifted an aggregate of 33,500 shares to a trust for which the reporting person is the trustee. Held by trust(s) for which the reporting person is the trustee. Shares received in settlement of the 2016 Performance Unit grant. Shares disposed to pay applicable withholding taxes on shares received from the 2016 Performance Unit grant. Restricted stock units that convert into common stock on a one-for-one basis. One-third of the restricted stock units vests on April 23, 2020 and the remainder vests in equal monthly installments over the twenty-four months following April 23, 2020. Shares disposed to pay applicable withholding taxes on Restricted stock units converted into common stock on April 24, 2019. Shares owned by Remy Capital Partners III, L.P. Mr. Siegel is the sole stockholder of the general partner of Remy Capital Partners III, L.P. By Barry Huntsman pursuant to a Limited Power of Attorney filed with the SEC on 3/29/2013 /s/ Barry Huntsman 2019-04-25