Ownership Submission
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
OMB APPROVAL
OMB Number: 3235-0287
Expires: January 31, 2005
Estimated average burden hours per response... 0.5

(Print or Type Responses)
1. Name and Address of Reporting Person *
Hazlett James R
  2. Issuer Name and Ticker or Trading Symbol
NATURAL GAS SERVICES GROUP INC [ngs]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
VP -- Technical Services
(Last)
(First)
(Middle)
2208 S.C.R. 1084 1/2
3. Date of Earliest Transaction (Month/Day/Year)
01/22/2018
(Street)

MIDLAND, TX 79706
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 01/22/2018   M   198 A $ 17.51 45,141 D  
Common Stock 01/22/2018   S   198 D $ 28.9 44,943 D  
Common Stock 01/23/2018   M   979 A $ 17.51 45,922 D  
Common Stock 01/23/2018   S   979 D $ 28.95 44,943 D  
Common Stock 01/23/2018   S   513 D $ 29 44,430 D  
Common Stock 01/24/2018   M   200 A $ 17.51 44,630 D  
Common Stock 01/24/2018   S   200 D $ 28.9 44,430 D  

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number. SEC 1474 (9-02)

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
Employee Stock Option $ 17.51 01/22/2018   M     198 09/10/2009 09/10/2018 Common Stock 198 $ 0 1,281 D  
Employee Stock Option $ 17.51 01/23/2018   M     979 09/10/2009 09/10/2018 Common Stock 979 $ 0 302 D  
Employee Stock Option $ 17.51 01/24/2018   M     200 09/10/2009 09/10/2018 Common Stock 200 $ 0 102 D  
Restricted Stock Units (1)               (1)   (1) Common Stock 15,000   15,000 D  
Employee Stock Option $ 17.74             12/09/2010 12/08/2019 Common Stock 10,000   10,000 D  
Employee Stock Option $ 17.81             01/25/2012 01/24/2021 Common Stock 10,000   10,000 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
Hazlett James R
2208 S.C.R. 1084 1/2
MIDLAND, TX 79706
      VP -- Technical Services  

Signatures

 James R. Hazlett   01/24/2018
**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) Not Applicable. Each RSU represents the right to receive one share of Company common stock upon vesting without payment.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB number.