SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D A/9

Under the Securities Exchange Act of 1934

(Amendment No. 9)*

Diamondback Energy, Inc.

(Name of Issuer)

Common Stock, par value $0.01 per share

(Title of Class of Securities)

25278X109

(CUSIP Number)

Arthur H. Amron, Esq.

Wexford Capital LP

411 West Putnam Avenue

Greenwich, CT 06830

(203) 862-7012

(Name, Address and Telephone Number of Person Authorized to

Receive Notices and Communications)

 December  17, 2014

(Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of Rule 13d-1(e), Rule 13d-1(f) or Rule 13d-1(g), check the following box.o

Note: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See section 240.13d-7 for other parties to whom copies are to be sent.

*    The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or other subject to the liabilities of that section of Act but shall be subject to all other provisions of the Act (however, see the Notes).

CUSIP No. 25278X109
1	Names of Reporting Person.			DB Energy Holdings LLC
2	Check the Appropriate Box if a Member of a Group  (a)  p (b)  o
3	SEC Use Only
4	Source of Funds (See Instructions)			OO
5	Check if Disclosure of Legal Proceedings is Required Pursuant to Items 2(d) or 2(e)			o
6	Citizenship or Place of Organization			Delaware
Number of Shares Beneficially Owned by Each Reporting Person With		7	Sole Voting Power			0
		8	Shared Voting Power (see Item 5 below)			4,046,894
		9	Sole Dispositive Power			0
		10	Shared Dispositive Power (see Item 5 below)			4,046,894
11	Aggregate Amount Beneficially Owned by Each Reporting Person					4,046,894
12	Check if the Aggregate Amount in Row (11) Excludes Certain Shares o
13	Percent of Class Represented by Amount in Row (11)				7.1%
14	Type of Reporting Person			HC

CUSIP No. 25278X109
1	Names of Reporting Person.			Wexford Spectrum Fund, L.P.
2	Check the Appropriate Box if a Member of a Group  (a)  p (b)  o
3	SEC Use Only
4	Source of Funds (See Instructions)			OO
5	Check if Disclosure of Legal Proceedings is Required Pursuant to Items 2(d) or 2(e)			o
6	Citizenship or Place of Organization			Delaware
Number of Shares Beneficially Owned by Each Reporting Person With		7	Sole Voting Power			0
		8	Shared Voting Power (see Item 5 below)			48,281
		9	Sole Dispositive Power			0
		10	Shared Dispositive Power (see Item 5 below)			48,281
11	Aggregate Amount Beneficially Owned by Each Reporting Person					48,281
12	Check if the Aggregate Amount in Row (11) Excludes Certain Shares o
13	Percent of Class Represented by Amount in Row (11)				0.1%
14	Type of Reporting Person			PN

CUSIP No. 25278X109
1	Names of Reporting Person.			Wexford Catalyst Fund, L.P.
2	Check the Appropriate Box if a Member of a Group  (a)  p (b)  o
3	SEC Use Only
4	Source of Funds (See Instructions)			OO
5	Check if Disclosure of Legal Proceedings is Required Pursuant to Items 2(d) or 2(e)			o
6	Citizenship or Place of Organization			Delaware
Number of Shares Beneficially Owned by Each Reporting Person With		7	Sole Voting Power			0
		8	Shared Voting Power (see Item 5 below)			7,628
		9	Sole Dispositive Power			0
		10	Shared Dispositive Power (see Item 5 below)			7,628
11	Aggregate Amount Beneficially Owned by Each Reporting Person					7,628
12	Check if the Aggregate Amount in Row (11) Excludes Certain Shares o
13	Percent of Class Represented by Amount in Row (11)				0.0%
14	Type of Reporting Person			PN

CUSIP No. 25278X109
1	Names of Reporting Person.			Spectrum Intermediate Fund Limited
2	Check the Appropriate Box if a Member of a Group  (a)  p (b)  o
3	SEC Use Only
4	Source of Funds (See Instructions)			OO
5	Check if Disclosure of Legal Proceedings is Required Pursuant to Items 2(d) or 2(e)			o
6	Citizenship or Place of Organization			Cayman Island
Number of Shares Beneficially Owned by Each Reporting Person With		7	Sole Voting Power			0
		8	Shared Voting Power (see Item 5 below)			159,716
		9	Sole Dispositive Power			0
		10	Shared Dispositive Power (see Item 5 below)			159,716
11	Aggregate Amount Beneficially Owned by Each Reporting Person					159,716
12	Check if the Aggregate Amount in Row (11) Excludes Certain Shares o
13	Percent of Class Represented by Amount in Row (11)				0.3%
14	Type of Reporting Person			OO

CUSIP No. 25278X109
1	Names of Reporting Person.			Catalyst  Intermediate Fund Limited
2	Check the Appropriate Box if a Member of a Group  (a)  p (b)  o
3	SEC Use Only
4	Source of Funds (See Instructions)			OO
5	Check if Disclosure of Legal Proceedings is Required Pursuant to Items 2(d) or 2(e)			o
6	Citizenship or Place of Organization			Cayman Island
Number of Shares Beneficially Owned by Each Reporting Person With		7	Sole Voting Power			0
		8	Shared Voting Power (see Item 5 below)			29,928
		9	Sole Dispositive Power			0
		10	Shared Dispositive Power (see Item 5 below)			29,928
11	Aggregate Amount Beneficially Owned by Each Reporting Person					29,928
12	Check if the Aggregate Amount in Row (11) Excludes Certain Shares o
13	Percent of Class Represented by Amount in Row (11)				0.1%
14	Type of Reporting Person			OO

CUSIP No. 25278X109
1	Names of Reporting Person.			Wexford Capital LP
2	Check the Appropriate Box if a Member of a Group (See Instructions) (a)  p (b)  o
3	SEC Use Only
4	Source of Funds			OO
5	Check if Disclosure of Legal Proceedings is Required Pursuant to Items 2(d) or 2(e)			o
6	Citizenship or Place of Organization			Delaware
Number of Shares Beneficially Owned by Each Reporting Person With		7	Sole Voting Power			0
		8	Shared Voting Power (see Item 5 below)			4,366,055
		9	Sole Dispositive Power			0
		10	Shared Dispositive Power (see Item 5 below)			4,366,055
11	Aggregate Amount Beneficially Owned by Each Reporting Person					4,366,055
12	Check if the Aggregate Amount in Row (11) Excludes Certain Shares o
13	Percent of Class Represented by Amount in Row (11)				7.7%
14	Type of Reporting Person			PN

CUSIP No. 25278X109
1	Names of Reporting Person.			Wexford GP LLC
2	Check the Appropriate Box if a Member of a Group  (a)  p (b)  o
3	SEC Use Only
4	Source of Funds (See Instructions)			OO
5	Check if Disclosure of Legal Proceedings is Required Pursuant to Items 2(d) or 2(e)			o
6	Citizenship or Place of Organization			Delaware
Number of Shares Beneficially Owned by Each Reporting Person With		7	Sole Voting Power			0
		8	Shared Voting Power (see Item 5 below)			4,366,055
		9	Sole Dispositive Power			0
		10	Shared Dispositive Power (see Item 5 below)			4,366,055
11	Aggregate Amount Beneficially Owned by Each Reporting Person					4,366,055
12	Check if the Aggregate Amount in Row (11) Excludes Certain Shares o
13	Percent of Class Represented by Amount in Row (11)				7.7%
14	Type of Reporting Person			OO

CUSIP No. 25278X109
1	Names of Reporting Person.			Charles E. Davidson
2	Check the Appropriate Box if a Member of a Group (See Instructions) (a)  p (b)  o
3	SEC Use Only
4	Source of Funds			OO
5	Check if Disclosure of Legal Proceedings is Required Pursuant to Items 2(d) or 2(e)			o
6	Citizenship or Place of Organization			United States
Number of Shares Beneficially Owned by Each Reporting Person With		7	Sole Voting Power			0
		8	Shared Voting Power (see Item 5 below)			4,366,055
		9	Sole Dispositive Power			0
		10	Shared Dispositive Power (see Item 5 below)			4,366,055
11	Aggregate Amount Beneficially Owned by Each Reporting Person					4,366,055
12	Check if the Aggregate Amount in Row (11) Excludes Certain Shares o
13	Percent of Class Represented by Amount in Row (11)				7.7%
14	Type of Reporting Person			IN

CUSIP No. 25278X109
1	Names of Reporting Person.			Joseph M. Jacobs
2	Check the Appropriate Box if a Member of a Group (See Instructions) (a)  p (b)  o
3	SEC Use Only
4	Source of Funds			OO
5	Check if Disclosure of Legal Proceedings is Required Pursuant to Items 2(d) or 2(e)			o
6	Citizenship or Place of Organization			United States
Number of Shares Beneficially Owned by Each Reporting Person With		7	Sole Voting Power			0
		8	Shared Voting Power (see Item 5 below)			4,366,055
		9	Sole Dispositive Power			0
		10	Shared Dispositive Power (see Item 5 below)			4,366,055
11	Aggregate Amount Beneficially Owned by Each Reporting Person					4,366,055
12	Check if the Aggregate Amount in Row (11) Excludes Certain Shares o
13	Percent of Class Represented by Amount in Row (11)				7.7%
14	Type of Reporting Person			IN

SCHEDULE 13D A/9

This Amendment No. 9 to Schedule 13D (this "Amendment No. 9") modifies and supplements the Schedule 13D initially filed on October 22, 2012, as amended by Amendment No. 1 filed on December 11, 2012, Amendment No. 2 filed on July 2, 2013, Amendment No. 3 filed on November 18, 2013, Amendment No. 4 filed on March 4, 2014, Amendment No. 5 filed on March 26, 2014, Amendment No. 6 filed on July 3, 2014, Amendment No. 7 filed on September 25, 2014 and Amendment No. 8 filed on November 20, 2014 (the "Statement"), with respect to the common stock, $0.01 par value per share (the “Common Stock”), of Diamondback Energy, Inc. (the “Issuer”). Except to the extent supplemented or amended by the information contained in this Amendment No. 9, the Statement remains in full force and effect.  Capitalized terms used herein without definition have the respective meanings ascribed to them in the Statement.

Item 4.                                Purpose of the Transaction

Item 4 is hereby amended to add the following:

Since Amendment No. 8 was filed on November 20, 2014, Wexford received payment for certain Additional Services under an Advisory Services Agreement with the Issuer consisting of $3,750,000 in cash and 63,786 shares of the Issuer’s Common Stock.

In addition the Funds sold 1,540,000 shares of Common Stock pursuant to the Form 144 filed by the Funds on December 17, 2014.

The Funds may from time to time decide to sell more shares of Common Stock depending on prevailing market conditions.

Item 5.                                Interest in Securities of the Issuer

Item 5 is hereby amended and restated in its entirety with the following:

(a)-(b)The aggregate number and percentage of shares of Common Stock beneficially owned by the Reporting Persons (on the basis of a total of 56,752,819  shares of Common Stock outstanding as of November 12, 2014, as reported by the Issuer in the  prospectus filed by the Issuer pursuant to Rule 424(b) under the Securities Act with the Commission on November 14, 2014 are as follows:

DB Energy Holdings LLC
a)		Amount beneficially owned: 4,046,894	Percentage: 7.1%
b)		Number of shares to which the Reporting Person has:
	i.	Sole power to vote or to direct the vote:	0
	ii.	Shared power to vote or to direct the vote:	4,046,894
	iii.	Sole power to dispose or to direct the disposition of:	0
	iv.	Shared power to dispose or to direct the disposition of:	4,046,894
Wexford Spectrum Fund, L.P.
a)		Amount beneficially owned: 48,281	Percentage: 0.1%
b)		Number of shares to which the Reporting Person has:
	i.	Sole power to vote or to direct the vote:	0
	ii.	Shared power to vote or to direct the vote:	48,281
	iii.	Sole power to dispose or to direct the disposition of:	0
	iv.	Shared power to dispose or to direct the disposition of:	48,281
Wexford Catalyst Fund, L.P.
a)		Amount beneficially owned: 7,628	Percentage: 0.0%
b)		Number of shares to which the Reporting Person has:
	i.	Sole power to vote or to direct the vote:	0
	ii.	Shared power to vote or to direct the vote:	7,628
	iii.	Sole power to dispose or to direct the disposition of:	0
	iv.	Shared power to dispose or to direct the disposition of:	7,628
Spectrum Intermediate Fund Limited
a)		Amount beneficially owned: 159,716	Percentage: 0.3%
b)		Number of shares to which the Reporting Person has:
	i.	Sole power to vote or to direct the vote:	0
	ii.	Shared power to vote or to direct the vote:	159,716
	iii.	Sole power to dispose or to direct the disposition of:	0
	iv.	Shared power to dispose or to direct the disposition of:	159,716
Catalyst Intermediate Fund Limited
a)		Amount beneficially owned: 29,928	Percentage: 0.1%
b)		Number of shares to which the Reporting Person has:
	i.	Sole power to vote or to direct the vote:	0
	ii.	Shared power to vote or to direct the vote:	29,928
	iii.	Sole power to dispose or to direct the disposition of:	0
	iv.	Shared power to dispose or to direct the disposition of:	29,928
Wexford Capital LP
a)		Amount beneficially owned: 4,366,055	Percentage: 7.7%
b)		Number of shares to which the Reporting Person has:
	i.	Sole power to vote or to direct the vote:	0
	ii.	Shared power to vote or to direct the vote:	4,366,055
	iii.	Sole power to dispose or to direct the disposition of:	0
	iv.	Shared power to dispose or to direct the disposition of:	4,366,055
Wexford GP LLC
a)		Amount beneficially owned: 4,366,055	Percentage: 7.7%
b)		Number of shares to which the Reporting Person has:
	i.	Sole power to vote or to direct the vote:	0
	ii.	Shared power to vote or to direct the vote:	4,366,055
	iii.	Sole power to dispose or to direct the disposition of:	0
	iv.	Shared power to dispose or to direct the disposition of:	4,366,055
Charles E. Davidson
a)		Amount beneficially owned: 4,366,055	Percentage: 7.7%
b)		Number of shares to which the Reporting Person has:
	i.	Sole power to vote or to direct the vote:	0
	ii.	Shared power to vote or to direct the vote:	4,366,055
	iii.	Sole power to dispose or to direct the disposition of:	0
	iv.	Shared power to dispose or to direct the disposition of:	4,366,055
Joseph M. Jacobs
a)		Amount beneficially owned: 4,366,055	Percentage: 7.7%
b)		Number of shares to which the Reporting Person has:
	i.	Sole power to vote or to direct the vote:	0
	ii.	Shared power to vote or to direct the vote:	4,366,055
	iii.	Sole power to dispose or to direct the disposition of:	0
	iv.	Shared power to dispose or to direct the disposition of:	4,366,055

The total shares of Common Stock reported as beneficially owned by each of Wexford Capital, Wexford GP, Mr. Davidson and Mr. Jacobs include the shares of Common Stock reported as beneficially owned by the Funds and Wexford Capital. Wexford Capital may, by reason of its status as manager or investment manager of the Funds, be deemed to own beneficially the securities of which the Funds possess beneficial ownership. Wexford GP may, as the General Partner of Wexford Capital, be deemed to own beneficially the securities of which the Funds possess beneficial ownership. Each of Davidson and Jacobs may, by reason of his status as a controlling person of Wexford GP, be deemed to own beneficially the securities of which the Funds possess beneficial ownership. Each of Wexford Capital, Wexford GP, Davidson and Jacobs shares the power to vote and to dispose of the securities beneficially owned by the Funds.  Each of Wexford Capital, Wexford GP, Davidson and Jacobs disclaims beneficial ownership of the securities owned by the Funds and this report shall not be deemed as an admission that they are the beneficial owners of such securities except, in the case of Davidson and Jacobs, to the extent of their respective interests in the Funds.

(c)            Except as set forth in Item 4 above none of the Reporting Persons has effected any Transactions in common stock during the 60 days and as previously reported in Amendment No. 8 to this Statement, proceeding the date of this Amendment No.9.

(d)           Not applicable.

(e)           Not applicable.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Date: December 29, 2014	Company Name
	DB ENERGY HOLDINGS LLC
	By:	/s/ Arthur H. Amron
	Name:	Arthur H. Amron
	Title:	Vice President and Assistant Secretary
	WEXFORD SPECTRUM FUND, L.P.
	By:	Wexford Spectrum Advisors, L.P.
	By:	Wexford Spectrum Advisors GP LLC
	By:	/s/ Arthur H. Amron
	Name:	Arthur H. Amron
	Title:	Vice President and Assistant Secretary
	WEXFORD CATALYST FUND, L.P.
	By:	Wexford Catalyst Advisors, L.P.
	By:	Wexford Catalyst Advisors GP LLC
	By:	/s/ Arthur H. Amron
	Name:	Arthur H. Amron
	Title:	Vice President and Assistant Secretary
	SPECTRUM INTERMEDIATE FUND LIMITED
	By:	/s/ Arthur H. Amron
	Name:	Arthur H. Amron
	Title:	Vice President and Assistant Secretary
	CATALYST INTERMEDIATE FUND LIMITED
	By:	/s/ Arthur H. Amron
	Name:	Arthur H. Amron
	Title:	Vice President and Assistant Secretary
	WEXFORD CAPITAL LP
	By:	Wexford GP LLC, its General Partner
	By:	/s/ Arthur H. Amron
	Name:	Arthur H. Amron
	Title:	Vice President and Assistant Secretary
	WEXFORD GP LLC
	By:	/s/ Arthur H. Amron
	Name:	Arthur H. Amron
	Title:	Vice President and Assistant Secretary
	/s/ Joseph M. Jacobs
	JOSEPH M. JACOBS
	/s/ Charles E. Davidson
	CHARLES E. DAVIDSON