Key Players: (this may not be a complete list and extra companies can be added upon request)

Schlumberger Limited
Halliburton Company
Baker Hughes Company
Weatherford International plc
National Oilwell Varco Inc.
C&J Energy Services Inc.
Calfrac Well Services Ltd.
FTS International Inc.
Liberty Oilfield Services Inc.
NexTier Oilfield Solutions Inc.