Diamondback Energy to acquire Energen MIDLAND, Texas–(BUSINESS WIRE) Diamondback Energy, Inc. and Energen Corporation announced that they have entered into a definitive agreement under which Diamondback will acquire Energen in an all-stock transaction valued at approximately $9.2 billion, including Energen’s net debt of $830 million as of June 30, 2018. The consideration will consist of 0.6442 shares of Diamondback common …