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CARBO Ceramics Inc., a technology company, provides products and services to the oil and gas, industrial, and environmental markets worldwide. It operates through two segments, Oilfield and Industrial Technologies and Services, and Environmental Technologies and Services. The Oilfield and Industrial Technologies and Services segment manufactures and sells oilfield ceramic technology products, base ceramic proppants, and frac sand proppants to pressure pumping companies, and oil and gas operators for use in the hydraulic fracturing of natural gas and oil wells. It also provides technology to design, build, and optimize the Frac; sells fracture stimulation software under the FracPro brand; and offers fracture design and consulting services to oil and natural gas exploration and production companies under the StrataGen brand name. The Environmental Technologies and Services segment provides spill prevention, containment, and countermeasure systems for the oil and gas industry. CARBO Ceramics Inc. was founded in 1987 and is headquartered in Houston, Texas.

Gevo, Inc. operates as a carbon abatement company. It operates through three segments: Gevo, Agri-Energy, and Renewable Natural Gas. The company focuses on transforming renewable energy into energy-dense liquid hydrocarbons that can be used as renewable fuels. It offers renewable gasoline and diesel, isobutanol, sustainable aviation fuel, renewable natural gas, isobutylene, ethanol, and animal feed and protein. The company was formerly known as Methanotech, Inc. and changed its name to Gevo, Inc. in March 2006. Gevo, Inc. was incorporated in 2005 and is headquartered in Englewood, Colorado.

InPlay Oil Corp. engages in the acquisition, exploration, development, and production of petroleum and natural gas properties in Canada. The company produces and sells crude oil, natural gas, and natural gas liquids. It focuses on light oil asset base located in West Central, Alberta. InPlay Oil Corp. is headquartered in Calgary, Canada.

Mesa Royalty Trust owns net overriding royalty interests in various oil and gas producing properties in the United States. The company has interests in properties located in the Hugoton field of Kansas; and the San Juan Basin of Northwestern New Mexico and Southwestern Colorado. Mesa Royalty Trust was founded in 1979 and is based in Houston, Texas.

U.S. Energy Corp., an independent energy company, focuses on the acquisition, exploration, and development of oil and natural gas properties in the United States. It holds interests in various oil and gas properties located in the Rockies region, including Montana, Wyoming, and North Dakota; the Mid-Continent region comprising Oklahoma, Kansas, and North and East Texas; West Texas; South Texas; and the Gulf Coast regions. The company was incorporated in 1966 and is headquartered in Houston, Texas.