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Houston Offshore Engineering is a Houston, TX-based company in the Energy and Utilities sector.
Artex Oil Company is a Marietta, OH-based company in the Energy and Utilities sector.
Fluid Clarification DanVic Inc. is a Calgary, AB-based company in the Energy & Utilities sector.
Adams Poured Walls Inc is a Grass Lake, MI-based company in the Energy & Utilities sector.
HollyFrontier Corporation, headquartered in Dallas, Texas, is an independent petroleum refiner and marketer that produces high value light products such as gasoline, diesel fuel, jet fuel and other specialty products. HollyFrontier operates through its subsidiaries a 135,000 barrels per stream day ("bpsd") refinery located in El Dorado, Kansas, a 125,000 bpsd refinery in Tulsa, Oklahoma, a 100,000 bpsd refinery located in Artesia, New Mexico, a 52,000 bpsd refinery located in Cheyenne, Wyoming and a 31,000 bpsd refinery in Woods Cross, Utah. HollyFrontier markets its refined products principally in the Southwest U.S., the Rocky Mountains extending into the Pacific Northwest and in other neighboring Plains states.