X0508 4 2023-09-01 1 0000889900 PATTERSON UTI ENERGY INC PTEN 0001404073 Blackstone Holdings III L.P. C/O BLACKSTONE INC. 345 PARK AVENUE NEW YORK NY 10154 0 0 0 1 Former 10% Owner 0001478809 Blackstone Holdings III GP L.P. C/O BLACKSTONE INC. 345 PARK AVENUE NEW YORK NY 10154 0 0 0 1 Former 10% Owner 0001478815 Blackstone Holdings III GP Management L.L.C. C/O BLACKSTONE INC. 345 PARK AVENUE NEW YORK NY 10154 0 0 0 1 Former 10% Owner 0001393818 Blackstone Inc. 345 PARK AVENUE NEW YORK NY 10154 0 0 0 1 Former 10% Owner 0001404071 Blackstone Group Management L.L.C. C/O BLACKSTONE INC. 345 PARK AVENUE NEW YORK NY 10154 0 0 0 1 Former 10% Owner 0001070844 SCHWARZMAN STEPHEN A C/O BLACKSTONE INC. 345 PARK AVENUE NEW YORK NY 10154 0 0 0 1 Former 10% Owner 0 As a result of an increase in the outstanding Common Stock in connection with the closing of the merger between the Issuer and NexTier Oilfield Solutions, Inc. as previously disclosed in the Current Report on Form 8-K filed by the Issuer with the SEC on September 1, 2023, the Reporting Persons' beneficial ownership decreased to less than 10% of the outstanding Common Stock and, accordingly, such Reporting Persons ceased being subject to Section 16. Due to the limitations of the electronic filing system, certain Reporting Persons are filing a separate Form 4. Blackstone Holdings III L.P., By: Blackstone Holdings III GP L.P., its general partner, By: Blackstone Holdings III GP Management L.L.C., its general partner, By: /s/ Tabea Hsi, Name: Tabea Hsi, Title: Senior Managing Director 2023-09-12 Blackstone Holdings III GP L.P., By: Blackstone Holdings III GP Management L.L.C., its general partner, By: /s/ Tabea Hsi, Name: Tabea Hsi, Title: Senior Managing Director 2023-09-12 Blackstone Holdings III GP Management L.L.C., By: /s/ Tabea Hsi, Name: Tabea Hsi, Title: Senior Managing Director 2023-09-12 Blackstone Inc., By: /s/ Tabea Hsi, Name: Tabea Hsi, Title: Senior Managing Director 2023-09-12 Blackstone Group Management L.L.C., By: /s/ Tabea Hsi, Name: Tabea Hsi, Title: Senior Managing Director 2023-09-12 Stephen A. Schwarzman, By: /s/ Stephen A. Schwarzman 2023-09-12