144 0001702981 XXXXXXXX LIVE 0000889900 Patterson UTI Energy 001-39270 10713 W. Sam Houston Pkwy N Suite 800 Houston TX 77064 2817657100 JCS Partners LP Director Common shares UBS Financial Services Inc

1000 Harbor Blvd 3rd Floor Weehawken NJ 07086

80000 480000 385987026 05/09/2025 NASDAQ Common shares 10/31/2019 Merger with NexTier Issuer N 1839089 10/31/2019 na N James Stewart

10077 Grogan Mills Rd Ste 100 Spring TX 77380

common 03/07/2025 48149 357313 JCS Partners LP

10077 Grogan Mills Rd Ste 100 Spring TX 77380

common 03/07/2025 192000 1422144 James Stewart is a partner of JCS Partners LP and he is also a Director of PTEN 05/09/2025 /s/JOSEPH CASSIDY UBS Financial Services Inc, as attorney-in-fact for JCS Partners LP