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 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 that manufacture, market, and distribute medical and other health-related products; and companies that offer medical and other health care services.

Companies that provide water transportation of natural gas and other gas products.

Companies that explore for natural gas (including geophysical, geological, and other exploration services).

Companies that provide water transportation of oil and oil products.

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 water transportation services of passengers and cargo using ships, barges, boats, and other water craft through inland water and deep seas

Companies that provide health care services (including clinics, hospitals, medical and diagnostic laboratories, nursing and residential care facilities, home health care, specialized health care services, weight and health management, health care plans, veterinary care services, and other health care services).

Companies that explore for natural gas, drill gas wells, and transport gas to processing plants or other destinations; companies that engage in the production of natural gas and the recovery of sulfur and hydrocarbon liquids from natural gas; and companies that market and distribute natural gas and related products.

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 drill gas wells, possibly for others on a contract or fee basis (including contractors that specialize in drilling in, re-drilling, and directional drilling).

Companies that provide medical, diagnostic, and treatment services (including surgical and non-surgical treatment) for a variety of medical conditions to patients (both inpatients and outpatients) with an organized staff of physicians and other medical staff.

Companies that provide transportation services (including air, ground, and maritime transportation in addition to logistics services) and design, manufacture, assemble, and distribute transportation products (including aircrafts, automobiles, boats, and rail products).

Companies that provide transportation services of passengers and cargo through air, water, ground, and rail; companies that provide postal and messenger services; and companies that provide support services to the industry.

Companies that produce natural gas, their activities comprise the recovery of sulfur and hydrocarbon liquids from natural gas.

Companies that provide water transportation services of passengers and cargo using ships, barges, boats, and other water craft through inland water and deep seas. The industry includes companies that operate seaports, maritime travel and shipping, related support services.

Companies that explore for crude petroleum (including geophysical, geological, and other exploration services).

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).

Companies that provide medical, diagnostic, and treatment services to patients (both inpatients and outpatients) with an organized staff of physicians and other medical staff. Hospitals Include general and specialized hospitals.