Might Texas-born Bob Simpson be looking to build back the Williston Basin powerhouse he created more than a decade ago? Back in 2010, the company Simpson founded in 1986—XTO Energy—merged with Exxon in a $41 billion all-stock deal pronounced one of the largest transactions in history for an independent oil and gas company. ...

Gene Shepherd is packing a punch in the Permian’s southern Delaware hood, where drilling rigs and pumpjacks operated by neighbors like Diamondback Energy, Continental Resources, and XTO, mechanically hum their tunes in cadences that can either lullaby a producer to sleep or keep him mercilessly awake at night....

If there’s a soul alive in the shale business who hasn’t heard of Harold Hamm, well, God bless your heart. The CEO of Okla. City-based Continental Resources is not only legend among American wildcatters who bet big and won big, he could also well be the GOAT of modern times....