Companies that explore for crude petroleum, drill oil wells, and transport oil to processing plants or other destinations; and companies that engage in the production of crude petroleum, the mining and extraction of oil from oil shale and sand, and the marketing and distribution of oil and oil products.
Companies that manufacture, market, and distribute basic materials, industrial products, chemicals, as well as machinery and equipment.
Companies that design, manufacture, market, and/or distribute oil and gas field machinery and equipment (including oil and gas field drilling machinery and equipment, field production machinery and equipment, field derricks, water well drilling machinery, and other oil and gas field equipment).
Companies specialized in matching up employers with appropriately skilled employees.
Companies that specialize in performing business, consumer, environmental, and other activities for companies, households, or individuals in exchange for fees; and associations that promote the interests of their members including business and non-business associations or groups.
Companies that explore for crude petroleum, drill oil wells, and transport oil to processing plants (or other destinations), and companies that engage in the production of crude petroleum, as well as in the mining and extraction of oil from oil shale and sand.
Companies specialized in performing a wide range of human resource and personnel management duties for businesses (including man-power supply, payroll accounting, payroll tax return preparation, benefits administration, recruiting, and other services).
Companies that design, manufacture, assemble, market, distribute, and/or lease machinery and equipment (lighting equipment, agriculture machinery, commercial hardware, fastener equipment, construction machinery, electrical machinery, food service and food retail machinery, industrial automation and industrial control equipment, pumps, valves, seals, fluid control equipment, as well as safety and security equipment).
Companies that engage in performing support activities for oil and gas operations (onshore and offshore) on a contract or fee basis (including well surveying, cementing, shooting, chemical treatment, cleaning out, bailing, and swabbing, perforating well casings, and other oil and gas field services).
Companies that explore for crude petroleum and natural gas, drill oil and gas wells, and transport oil and gas to processing plants or other destinations; companies that provide oil and gas drilling equipment, and oil and gas field support services; companies that engage in the production of crude petroleum, the mining and extraction of oil from oil shale and sand, the production of natural gas, and the recovery of sulfur and hydrocarbon liquids from natural gas; companies that engage in the marketing and distribution of oil and gas products; companies that engage in the refining and processing of petroleum and the manufacturing of petrochemical products; companies that develop and operate alternative energy sources; and companies that invest in the oil and gas sector.
Companies that provide various business services to their clients (including advertising, auctions, business consulting, commercial cleaning, legal, public relations, repair and maintenance, security, translation and interpretation, staffing, survey and statistics, technical and scientific research, fairs and exhibitions, parking facility management).
Companies that engage in drilling oil wells, possibly for others on a contract or fee basis (including contractors that specialize in drilling in, re-drilling, and directional drilling).