Diamondback Energy Inc. announced cash tender offer by its wholly-owned subsidiary, Energen Corporation ("Energen"), to purchase any and all of Energen’s 4.625% Senior Notes due 2021 (the “Notes”) expired at 5:00 p.m., New York City time, on May 22, 2020 (the “Expiration Time”). As of the Expiration Time, $208,687,000 aggregate principal amount of the Notes (52.17%) were validly tendered, which excludes $385,000 aggregate principal amount of the Notes that remain subject to guaranteed delivery procedures. Energen expects to accept for payment all Notes validly tendered and not validly withdrawn in the tender offer and expects to make payment for the Notes on May 26, 2020. Pursuant to the terms of the tender offer, Notes not tendered in the tender offer will remain outstanding. J.P. Morgan Securities LLC acted as lead dealer manager. Citigroup Global Markets Inc. and Wells Fargo Securities, LLC acted as co-dealer managers.