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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(Print or Type Responses)

1. Name and Address of Reporting Person * Chase Mack C   2. Issuer Name and Ticker or Trading Symbol CONCHO RESOURCES INC [CXO] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director __X__ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) P.O. BOX 693 3. Date of Earliest Transaction (Month/Day/Year) 12/13/2007 (Street) ARTESIA, NM 88211-0693 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 (1) 12/13/2007   S   8,175,330 D $ 18.05 14,446,665 I Through Chase Oil Corporation (3) Common Stock (1) 12/13/2007   S   2,019,402 D $ 18.05 0 I Through Caza Energy LLC (4) Common Stock (2) 12/14/2007   S   1,776,615 D $ 18.05 12,670,050 I Through Chase Oil Corporation (3)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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
Chase Mack C P.O. BOX 693 ARTESIA, NM 88211-0693		X

Signatures

/s/ Mack C. Chase		12/17/2007
**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 shares were sold in a public offering of the Issuer pursuant to an Underwriting Agreement dated December 13, 2007 (the "Underwriting Agreement"), among the Issuer, Chase Oil Corporation, a New Mexico corporation ("Chase Oil"), Caza Energy LLC, a New Mexico limited liability company ("Caza"), the other selling stockholders named therein, and J.P. Morgan Securities Inc. and Banc of America Securities LLC, as representatives of the several underwriters named therein.
(2)	These shares were sold upon the exercise of the underwriters' over-allotment option pursuant to the Underwriting Agreement.
(3)	Represents shares owned by Chase Oil. The Reporting Person owns a majority of the voting stock of Chase Oil and therefore may be deemed to have voting and investment power with respect to the shares owned by Chase Oil. The Reporting Person disclaims beneficial ownership in the shares owned by Chase Oil except to the extent of his pecuniary interest in Chase Oil.
(4)	Represents shares owned by Caza. The Reporting Person is a manager of Caza and therefore shares voting and investment power with respect to the shares owned by Caza. The Reporting Person disclaims beneficial ownership in the shares owned by Caza except to the extent of his pecuniary interest in Caza.

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