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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1539838	Diamondback Energy Inc.	FANG	Crude Petroleum & Natural Gas (1311)	000000000

Insiders

Cik	Name	Reported Address	Director	Officer	Large Shareholder	Other
1001391	E Charles Davidson	C/O Wexford Capital Lp 411 West Putnam Ave. Greenwich CT 06830	No	No	Yes	No
1048462	Wexford Capital Lp	411 West Putnam Avenue Suite 125 Greenwich CT 06830	Yes	No	No	No
1048485	Joseph Jacobs	C/O Wexford Capital Lp 411 West Putnam Avenue, Suite 125 Greenwich CT 06830	No	No	Yes	No
1472112	Wexford Gp Llc	C/O Wexford Capital Lp Suite 125 Greenwich CT 06830	No	No	Yes	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock, Par Value $0.01	Disposition	2015-09-15	7,579	$67.15	415,984	No	4	S	Indirect	See footnotes
Common Stock, Par Value $0.01	Disposition	2015-09-16	216,135	$69.53	199,849	No	4	S	Indirect	See footnotes
Common Stock, Par Value $0.01	Disposition	2015-09-17	105,100	$70.93	94,749	No	4	S	Indirect	See footnotes

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Indirect	See footnotes
No	4	S	Indirect	See footnotes
No	4	S	Indirect	See footnotes

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock, Par Value $0.01	77,054	Direct

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 disclaims beneficial ownership of the securities reported herein, except to the extent of his or its actual pecuniary interest therein.