X0306 4 2022-04-04 0 0000889900 PATTERSON UTI ENERGY INC PTEN 0001453799 Smith Charles Andrew 10713 W. SAM HOUSTON PKWY N. SUITE 800 HOUSTON TX 77064 0 1 0 0 EVP & Chief Financial Officer Common Stock, $.01 par value per share 2022-04-04 4 S 0 318 16.55 D 339336 D The sales were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 24, 2022. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $16.50 to $16.63, inclusive. The Reporting Person undertakes to provide to Patterson-UTI Energy, Inc., any security holder of Patterson-UTI Energy, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. By Barry Huntsman pursuant to a limited power of attorney filed with the SEC on 09/08/2017 /s/ Barry Huntsman 2022-04-06