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C&J Energy Services, Inc. provides well construction, well completion, well support, and other complementary oilfield services and technologies to oil and gas exploration and production companies throughout the continental United States. It operates through Completion Services and Well Support Services segments. The Completion Services segment provides hydraulic fracturing; cased-hole solutions comprising cased-hole wireline, pumpdown, wireline logging, perforating, pressure pumping, well site make-up and pressure testing, and other complementary services; and well construction and intervention services, which include cementing, coiled tubing, rig services, fluids management, and other completion and well support services. This segment also engages in the engineering and production of various parts and components, such as perforating guns and addressable switches, which are used in the completion process. The Well Support Services segment offers rig services, such as providing workover and well servicing rigs that are primarily used for the routine repair and maintenance of oil and gas wells, re-drilling operations, and plugging and abandonment operations; fluids management services, including storage, transportation, and disposal services for fluids used in the drilling, completion, and workover of oil and gas wells; and other special well site services, such as fishing, contract labor, and tool rental services for the completion and workover of oil and gas wells. The company was founded in 1997 and is headquartered in Houston, Texas.

Southern Company Gas, formerly AGL Resources Inc, is a natural gas-only distribution company. The Company operates in four operating segments: distribution operations, retail operations, wholesale services and midstream operations. The Company's distribution operations segment is engaged in providing natural gas to residential, commercial and industrial customers. The retail operations segment is involved in the provision of natural gas commodity and related services. The wholesale services segment is engaged in natural gas storage, gas pipeline arbitrage and provides natural gas asset management and related logistics services for its utilities, as well as for non-affiliated companies. Midstream operations segment consists primarily of natural gas storage facilities and select pipelines, enabling the provision of diverse sources of natural gas supplies to its customers.

Gran Tierra Energy Inc., together with its subsidiaries, engages in the exploration and production of oil and gas properties in Colombia and Ecuador. The company was founded in 2003 and is headquartered in Calgary, Canada.