FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person * Stice Travis D.   2. Issuer Name and Ticker or Trading Symbol Diamondback Energy, Inc. [FANG] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) Chief Executive Officer (Last) (First) (Middle) 500 WEST TEXAS AVENUE, SUITE 1200 3. Date of Earliest Transaction (Month/Day/Year) 02/21/2019 (Street) MIDLAND, TX 79701 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 02/21/2019   A   22,230 (1) A $ 0 333,151 I By Stice Investments Ltd. (2) Common Stock 02/21/2019   A   90,168 (3) A $ 0 423,319 I By Stice Investments Ltd. (2) Common Stock 02/22/2019   F   8,748 (4) D $ 102.14 414,571 I By Stice Investments Ltd. (2) Common Stock 02/22/2019   F   34,012 (5) D $ 102.14 380,559 I By Stice Investments Ltd. (2) Common Stock 02/22/2019   F   2,916 (6) D $ 102.14 377,643 I By Stice Investments Ltd. (2) Common Stock 02/22/2019   F   2,675 (7) D $ 102.14 374,968 I By Stice Investments Ltd. (2)

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Stice Travis D. 500 WEST TEXAS AVENUE, SUITE 1200 MIDLAND, TX 79701	X		Chief Executive Officer

Signatures

/s/ Teresa L. Dick, as attorney-in-fact for Travis D. Stice		02/25/2019
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	These securities are performance-based restricted stock units for the performance period from January 1, 2017 to December 31, 2018 that were granted under the issuer's equity incentive plan on February 16, 2017. All of these performance-based restricted stock units vested as of December 31, 2018 upon certification by the issuer's compensation committee of the applicable performance conditions on February 21, 2019.
(2)	These securities are held by Stice Investments, Ltd., which is managed by Stice Management, LLC, its general partner. Mr. Stice and his spouse hold 100% of the membership interests in Stice Management, LLC, of which Mr. Stice is the manager.
(3)	These securities are performance-based restricted stock units for the performance period from January 1, 2016 to December 31, 2018 that were granted under the issuer's equity incentive plan on January 19, 2016. All of these performance-based restricted stock units vested as of December 31, 2018 upon certification by the issuer's compensation committee of the applicable performance conditions on February 21, 2019.
(4)	The issuer withheld shares of common stock that would have otherwise been issuable to the reporting person to satisfy the issuer's tax withholding obligations in connection with the vesting and settlement of the performance-based restricted stock units granted on February 16, 2017 and vested upon certification by the issuer's compensation committee on February 21, 2019. The number of shares of common stock withheld was determined based on the closing price per share of the issuer's common stock on February 22, 2019.
(5)	The issuer withheld shares of common stock that would have otherwise been issuable to the reporting person to satisfy the issuer's tax withholding obligations in connection with the vesting and settlement of the performance-based restricted stock units granted on January 19, 2016 and vested upon certification by the issuer's compensation committee on February 21, 2019. The number of shares of common stock withheld was determined based on the closing price per share of the issuer's common stock on February 22, 2019.
(6)	The issuer withheld shares of common stock that would have otherwise been issuable to the reporting person to satisfy the issuer's tax withholding obligations in connection with the vesting and settlement on February 22, 2019 of the third tranche of the time-based restricted stock units granted to the reporting person on February 16, 2017. The number of shares of common stock withheld was determined based on the closing price per share of the issuer's common stock on February 22, 2019.
(7)	The issuer withheld shares of common stock that would have otherwise been issuable to the reporting person to satisfy the issuer's tax withholding obligations in connection with the vesting and settlement on February 22, 2019 of the second tranche of the time-based restricted stock units granted to the reporting person on February 13, 2018. The number of shares of common stock withheld was determined based on the closing price per share of the issuer's common stock on February 22, 2019.

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