"Forty Under 40 in Energy" See also Private equity firm Private equity fund List of private equity firms List of oil exploration and production companies List of largest oil and gas companies by revenue Private equity real estate References External links Financial services companies established in 2010 Private equity firms of the United States Oil companies of the United States Natural gas companies of the United States Petroleum in Oklahoma Companies based in Oklahoma City Energy companies established in 2010 American companies established in 2010