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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	Insider Title	Director	Officer	Large Shareholder	Other
1559933	D. Travis Stice	500 West Texas, Suite 1200 Midland TX 79701	Chief Executive Officer	Yes	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Common Stock	Acquisiton	2014-04-21	75,000	$17.50	89,705	No	4	M	Direct
Common Stock	Disposition	2014-04-21	52,200	$72.28	37,505	No	4	S	Direct
Common Stock	Disposition	2014-04-21	20,000	$73.42	17,505	No	4	S	Direct
Common Stock	Disposition	2014-04-21	2,800	$73.99	14,705	No	4	S	Direct

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

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Stock Option (right to buy)	Disposition	2014-04-21	75,000	$0.00	75,000	$17.50

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
150,000		2016-04-18	No	4	M	Direct

Footnotes

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 20, 2014.
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $71.890 to $72.840, inclusive. The reporting person undertakes to provide to Diamondback Energy, Inc., any security holder of Diamondback Energy, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (2), (3) and (4) to this Form 4.
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $72.910 to $73.900, inclusive.
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $73.920 to $74.120, inclusive.
All of these options to purchase 75,000 shares of common stock of the issuer were vested at the time of exercise. Of the remaining options to purchase 150,000 shares of common stock of the issuer, options to purchase 75,000 shares of common stock are vested, and options to purchase 75,000 shares of common stock will vest on April 18, 2015.