David S. Schorlemer

ProPetro Holding Corp. is an oilfield services company, which engages in the provision of hydraulic fracturing and other complementary services. It operates through the following segments: Hydraulic Fracturing, Cementing, Coil Tubing, Flowback, Surface Drilling, and Drilling. The Hydraulic Fracturing segment intends to optimize hydrocarbon flow paths during the completion phase of horizontal shale wellbores. The Cementing segment provides isolation between fluid zones behind the casing to minimize potential damage to hydrocarbon bearing formations or the integrity of freshwater aquifers, and provides structural integrity for the casing by securing it to the earth. The Coil Tubing segment involves injecting coiled tubing into wells to perform various completion well intervention operations. The Flowback segment consistsof production testing, solids control, hydrostatic testing and torque services. The Surface Drilling segment offers cost-effective, pre-set surface air drilling services to target depths of approximately 4,000 feet in areas of fragile geology. The company was founded by Dale Redman and Jeffrey David Smith in 2005 and is headquartered in Midland, TX.

Founded in 1992, Basic Energy Services provides a range of services to help America’s oil and gas producers keep more than 900,000 existing wells in production throughout their lifecycle - from the initial drilling of the well to ongoing maintenance to plugging and abandonment. Today, more than 5,700 Basic Energy Services professionals provide essential services to over 2,000 oil and gas companies throughout the major oil and gas producing regions in Texas, Louisiana, Oklahoma, New Mexico, Arkansas, Kansas, the Appalachian Region and the Rocky Mountain States. Based in Fort Worth, Texas, Basic Energy Services, Inc. trades on the NYSE under the ticker symbol “BAS”

Gulf Island Fabrication, Inc. engages in the manufacture of steel structures, modules, and marine vessels. It also provides project management, hookup, commissioning, repair, maintenance, and civil construction services. It operates through the following segments: Fabrication, Shipyard, Services, and Corporate. The Fabrication segment fabricates modules for petrochemical and industrial facilities, foundations for alternative energy developments, and other complex steel structures. The Shipyard segment offers new build vessels and performs marine repair activities. The Services segment includes welding, interconnect piping, and other services required to connect production equipment and service modules and equipment on a platform. The Corporate segment represents expenses that do not directly relate to the operating segments. The company was founded by Alden J. Laborde in 1985 and is headquartered in Houston, TX.