 WILMINGTON, Del., Dec. 21, 2020 GLOBE NEWSWIRE -- Rigrodsky Long, P.A. announces that it is investigating QEP Resources, Inc. QEP NYSE: QEP regarding possible breaches of fiduciary duties and other violations of law related to QEPs agreement to be acquired by Diamondback Energy, Inc. Diamondback NASDAQ GS: FANG. Under the terms of the agreement, QEPs shareholders will receive 0.05 shares of Diamondback per share. 