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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
1559931	L. Teresa Dick	500 West Texas, Suite 1225 Midland TX 79701	Cfo, Sr. Vp	No	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	2013-09-16	8,572	$0.00	9,672	No	4	M	Direct
Common Stock	Disposition	2013-09-16	8,572	$44.71	1,100	No	4	S	Direct
Common Stock	Acquisiton	2013-09-17	1,118	$17.50	2,218	No	4	M	Direct
Common Stock	Disposition	2013-09-17	1,118	$45.10	1,100	No	4	S	Direct
Common Stock	Acquisiton	2013-09-18	1,546	$17.50	2,646	No	4	M	Direct
Common Stock	Disposition	2013-09-18	1,545	$45.08	1,100	No	4	S	Direct

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

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Restricted Stock Units	Disposition	2013-09-16	8,572	$0.00	8,572	$0.00
Common Stock	Stock Option (right to buy)	Disposition	2013-09-17	1,118	$0.00	1,118	$17.50
Common Stock	Stock Option (right to buy)	Disposition	2013-09-18	1,546	$0.00	1,546	$17.50

Remaning Holdings	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
8,571		No	4	M	Direct
48,882	2016-09-01	No	4	M	Direct
47,336	2016-09-01	No	4	M	Direct

Footnotes

Each restricted stock unit represents a contingent right to receive one share of common stock, par value $0.01 per share (the "Common Stock"), of Diamondback Energy, Inc. (the "Issuer") and was granted under the Isser's 2012 Stock Incentive Plan.
The remaining 8,571 restricted stock units will vest in two approximately equal annual installments beginning on September 1, 2014.
Of these options, 23,882 were vested and the remaining 25,000 options to purchase shares of Common Stock will vest in two approximately equal annual installments beginning on September 1, 2014.
Of these options, 22,336 were vested and the remaining 25,000 options to purchase shares of Common Stock will vest in two approximately equal annual installments beginning on September 1, 2014.