X0306 4 2015-03-02 0 0001539838 Diamondback Energy, Inc. FANG 0001048462 WEXFORD CAPITAL LP 411 WEST PUTNAM AVENUE SUITE 125 GREENWICH CT 06830 1 0 1 0 0001472112 Wexford GP LLC C/O WEXFORD CAPITAL LP SUITE 125 GREENWICH CT 06830 0 0 1 0 0001001391 DAVIDSON CHARLES E C/O WEXFORD CAPITAL LP 411 WEST PUTNAM AVE. GREENWICH CT 06830 0 0 1 0 0001048485 JACOBS JOSEPH C/O WEXFORD CAPITAL LP 411 WEST PUTNAM AVENUE, SUITE 125 GREENWICH CT 06830 0 0 1 0 Common Stock, par value $0.01 75476 D Common Stock, par value $0.01 2015-03-02 4 S 0 125795 71.2778 D 2628407 I See footnotes Common Stock, par value $0.01 2015-03-03 4 S 0 450000 71.5155 D 2178407 I See footnotes Common Stock, par value $0.01 2015-03-04 4 S 0 525960 71.7920 D 1652447 I See footnotes The securities disposed of were held by DB Energy Holdings LLC ("DB Energy"), Wexford Catalyst Fund, L.P. ("WCF"), Wexford Spectrum Fund, L.P. ("WSF"), Spectrum Intermediate Fund Limited ("SIF") and Catalyst Intermediate Fund Limited ("CIF" and, together with DB Energy, WCF, WSF and SIF, the "Funds"). This form is jointly filed by Wexford, Charles E. Davidson ("Davidson"), Joseph M. Jacobs ("Jacobs"), and Wexford GP LLC ("Wexford GP"). The common stock shown as beneficially owned by Davidson, Jacobs, Wexford GP and Wexford reflect common stock owned of record by the Funds. Wexford serves as manager, investment advisor or sub advisor of each of the Funds, and as such may be deemed to share beneficial ownership of the securities beneficially owned by the Funds. Wexford GP, as the general partner of Wexford, may be deemed to share beneficial ownership of the securities beneficially owned by the Funds. (continued under Footnote (3) below). (continued from Footnote (2) above) Davidson and Jacobs, as the controlling persons of Wexford GP, may be deemed to share beneficial ownership of any securities beneficially owned by the Funds for which Wexford serves as manager, investment advisor or sub advisor. Each of the Reporting Persons and each of the Funds disclaims beneficial ownership of the securities reported herein, except to the extent of his or its actual pecuniary interest therein. Wexford Capital LP, By: Wexford GP LLC, its general partner By: Arthur Amron, Vice President and Assistant Secretary 2015-03-04 Wexford GP LLC, By: Arthur Amron, Vice President and Assistant Secretary 2015-03-04 Charles E. Davidson 2015-03-04 Joseph M. Jacobs 2015-03-04