- 1968: Founded as South Texas Drilling with three land drilling rigs
- 2001: Grew to 16 drilling rigs. Changed name to Pioneer Drilling Company
- 2008: Grew to 69 drilling rigs. Acquired wireline services (55 wireline units), well servicing (70 well servicing rigs), and fishing and rental services from WEDGE Group
- 2012: Changed name to Pioneer Energy Services Corp.