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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	2015-12-09	9,822	$76.74	67,232	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Direct

Footnotes

The securities disposed of were held by Wexford Capital LP ("Wexford").
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 reflects common stock owned of record by Wexford. Wexford GP, as the general partner of Wexford, may be deemed to share beneficial ownership of the securities beneficially owned by Wexford. Davidson and Jacobs, as the controlling persons of Wexford GP, may be deemed to share beneficial ownership of any securities beneficially owned by Wexford. Each of Davidson, Jacobs, and Wexford GP disclaims beneficial ownership of the securities reported herein, except to the extent of his or its actual pecuniary interest therein.