[3] Ensign is one of the world's land-based drilling and well servicing contractors serving crude oil, natural gas and geothermal operators.

In the second quarter of 2005, the company changed its name from Ensign Resource Service Group to its current name.

In 2011, the company was accused of option backdating;[6] it eventually reached a $4 million settlement.

[8] In August 2018, Ensign made a C$470 million hostile takeover offer for Trinidad Drilling.

[10] The company reported a 72 per cent increase in revenue in its first full quarter since acquiring Trinidad Drilling Ltd. [11] In 2019, the company was awarded significant new drilling contracts in the United States, Canada and the Middle East.