Oilfield Services - Oilfield service companies assist the drilling companies in setting up oil and gas wells. In general these companies manufacture, repair and maintain equipment used in oil extraction and transport.

IO - ION Geophysical Corporation - Ion Geophysical Corporation is a technology-focused seismic solutions company,  and has been leading the industry for more than 35 years.
RES - RPC Inc. - RPC Inc. is an oil and gas services company which has numerous well positioned service lines in order to take full advantage of exploration and production.
CPX - Complete Production Services - Complete Production Services focuses on unconventional oil and gas resources located in North America.
KEG - Key Energy - Key Energy Services is headquarted in Houston, Texas. Key offers services in an array of onshore energy production such as workover services, fluid and logistics services, fishing and rental services, and drilling.
SPN - Superior Energy Services - Superior Energy Services provides specialized oilfield services and equipment, focused on serving drilling and production-related need of the oil and gas companies.
BAS - Basic Energy Services - Basic Energy Services has grown to be the 3rd largest well services contractor in the U.S. with more than 5,200 employees and over 100 service points.
HAL - Halliburton - Halliburton was founded back in 1919 and has become one of the world’s largest providers of products and services within the energy industry.
SLB - Schlumberger - Schlumberger has been around for more than 80 years, specializing in real-time technology services and solutions.
BHI - Baker Hughes - Baker Hughes creates solutions designed to lower costs, reduce risk, and improve productivity for international oil and gas industry.
WFT - Weatherford International - Weatherford International is one of the largest international providers of advanced products and services to the oil and gas industry.