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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
1559934	Russell Pantermuehl	500 West Texas Suite 1225 Midland TX 79701	Vp Reservoir Engineering	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	3,801	$0.00	5,801	No	4	M	Direct
Common Stock	Disposition	2013-09-16	3,801	$45.40	2,000	No	4	S	Direct
Common Stock	Acquisiton	2013-09-17	1,200	$0.00	3,200	No	4	M	Direct
Common Stock	Disposition	2013-09-17	1,200	$45.08	2,000	No	4	S	Direct
Common Stock	Acquisiton	2013-09-18	10,000	$17.50	12,000	No	4	M	Direct
Common Stock	Disposition	2013-09-18	10,000	$44.62	2,000	No	4	S	Direct
Common Stock	Acquisiton	2013-09-18	1,518	$17.50	3,518	No	4	M	Direct
Common Stock	Disposition	2013-09-18	1,518	$45.07	2,000	No	4	S	Direct
Common Stock	Acquisiton	2013-09-18	12,142	$0.00	14,142	No	4	M	Direct
Common Stock	Disposition	2013-09-18	12,142	$44.62	2,000	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
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	3,801	$0.00	3,801	$0.00
Common Stock	Restricted Stock Units	Disposition	2013-09-17	1,200	$0.00	1,200	$0.00
Common Stock	Stock Option (right to buy)	Disposition	2013-09-18	10,000	$0.00	10,000	$17.50
Common Stock	Stock Option (right to buy)	Disposition	2013-09-18	1,518	$0.00	1,518	$17.50
Common Stock	Restricted Stock Units	Disposition	2013-09-18	12,142	$0.00	12,142	$0.00

Remaning Holdings	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
30,486		No	4	M	Direct
29,286		No	4	M	Direct
90,000	2016-08-15	No	4	M	Direct
88,482	2016-08-15	No	4	M	Direct
17,144		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 Issuer's 2012 Stock Incentive Plan.
The remaning 17,144 restricted stock units will vest in two equal annual installments beginning on August 15, 2014.
Of these options, 40,000 are vested and the remaining 50,000 options to purchase shares of Common Stock will vest in two remaining equal annual installments beginning on August 15, 2014.
Of these options, 38,482 are vested and the remaining 50,000 options to purchase shares of Common Stock will vest in two remaining equal annual installments beginning on August 15, 2014.