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Energen Corporation, through its subsidiary, Energen Resources Corporation, engages in the exploration, development, and production of oil, natural gas liquids, and natural gas. The company has operations within the Midland Basin, the Delaware Basin, and the Central Basin Platform areas of the Permian Basin in west Texas and New Mexico. As of December 31, 2017, it had a total proved reserves of 444 million barrel of oil equivalent. The company was founded in 1929 and is headquartered in Birmingham, Alabama.

Kelso Technologies Inc. develops, produces, and distributes proprietary equipment used in transportation applications in the United States and Canada. It offers rail and road transport equipment, such as pressure relief, vacuum relief, bottom outlet, pressure car pressure relief, pressure car angle, and top ball valves; and one-bolt manways and related equipment, emergency response equipment, and no spill locomotive fueling equipment; and other specialty valves, parts, equipment, and services. The company was formerly known as Kelso Resources Ltd. and changed its name to Kelso Technologies Inc. in July 1994. Kelso Technologies Inc. was incorporated in 1987 and is headquartered in Surrey, Canada.

Rollins, Inc., through its subsidiaries, provides pest and wildlife control services to residential and commercial customers in the United States and internationally. The company offers pest control services to residential properties protecting from common pests, including rodents, insects, and wildlife. It also provides workplace pest control solutions for customers across various end markets, such as healthcare, foodservice, and logistics. In addition, the company offers termite protection services and ancillary services. It serves clients directly, as well as through franchisee operations. The company was formerly known as Rollins Broadcasting, Inc and changed its name to Rollins, Inc. in 1965. Rollins, Inc. was founded in 1901 and is headquartered in Atlanta, Georgia.

TETRA Technologies, Inc., together with its subsidiaries, operates as an energy services and solutions company. It operates through two segments, Completion Fluids & Products Division and Water & Flowback Services. The Completion Fluids & Products segment manufactures and markets clear brine fluids, additives, and associated products and services to the oil and gas industry for use in well drilling, completion, and workover operations in the United States, as well as in Latin America, Europe, Asia, the Middle East, and Africa. This segment also markets liquid and dry calcium chloride products; and TETRA PureFlow ultra-pure zinc bromide to battery technology companies. The Water & Flowback Services segment provides water management services for onshore oil and gas operators. This segment also offers frac flowback, production well testing, and other associated services in oil and gas producing regions in the United States, as well as in various basins in Latin America, Africa, Europe, and the Middle East. TETRA Technologies, Inc. was incorporated in 1981 and is headquartered in The Woodlands, Texas.