Christopher Wirtz

SESI Holdings, Inc. engages in the provision of oilfield services and equipment. It operates through the following segments: Drilling Products and Services, Onshore Completion and Workover Services, Production Services, and Technical Solutions. The Drilling Products and Services segment provides downhole drilling tools and surface rentals. The Onshore Completion and Workover Services segment offers pressure pumping, fluid management and workover services. The Production Services segment consists of intervention services. The Technical Solutions segment involves the products and services that address customer-specific needs with applications which typically require engineering, manufacturing, or project planning. The company was founded by Terence E. Hall in 1989 and is headquartered in Houston, TX.

ADS Services LLC manufactures pressure control equipment. The company is headquartered in Midland, TX.

U.S. Well Services LLC provides oil field services. It engages in pressure pumping and related services, including high-pressure hydraulic fracturing in unconventional oil and natural gas basins. The firm operates in the Marcellus and Utica shale regions that cover West Virginia, Pennsylvania and Ohio. The company was founded by Edward S. Self III and Jeffrey McPherson on February 21, 2012 and is headquartered in Houston, TX.

U.S. Well Services Holdings LLC engages in the provision of high-pressure and hydraulic fracturing services in oil and natural gas basins. Its FRAC technology delivers electric, mobile well stimulation systems powered by locally supplied natural gas including field gas sourced directly from the wellhead. It also offers PowerPath, OPTI-FLEX, WhisperFrac, F3 FUEL, AIM, and Clean Fleet technologies. The company was founded in 2012 and is headquartered in Willow Park, TX.