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                                  UNITED STATES

                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549


                                    FORM 8-K


                 CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d)
                     OF THE SECURITIES EXCHANGE ACT OF 1934

        Date of Report (Date of earliest event reported): August 4, 2004




                        NATURAL GAS SERVICES GROUP, INC.
             (Exact Name of Registrant as Specified in Its Charter)



            Colorado                       1-31398               75-2811855
  (State or other jurisdiction         (Commission File        (IRS Employer
of Incorporation or organization)           Number)          Identification No.)




2911 South County Road 1260 Midland, Texas                         79706
 (Address of Principal Executive Offices)                       (Zip Code)



                                  432-563-3974
              (Registrant's telephone number, including area code)






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Item 5.  Other Events and Regulation FD Disclosure.

         On July 27, 2004, we reported that Natural Gas Services Group, Inc. and
CBarney  Investments,  Ltd. had entered into a  Securities  Purchase  Agreement.
Under the agreement, Natural Gas Services Group agreed to issue and sell 649,574
shares of its  common  stock to CBarney at  $7.69736  per share,  for a total of
$5,000,000.00. The per share price was determined by multiplying (x) $8.747, the
average  closing market price of the common stock on the American Stock Exchange
for the  twenty  consecutive  trading  days  ended  July  15,  2004,  times  (y)
eighty-eight percent.

         On August 4,  2004,  we closed  the  transaction  and issued a total of
549,574  shares of our common  stock to CBarney  Investments,  Ltd.  and 100,000
shares to Mark X Energy Company, an affiliate of CBarney Investments, Ltd.

         Net  proceeds  from  the  sale  of  the  shares  are  estimated  to  be
approximately  $4,950,000.00.  We plan to use the net proceeds  from the sale of
the stock to advance the growth of our rental fleet of natural gas  compressors,
working capital and general corporate purposes,  including possible  acquisition
of strategically  located  compressor  companies.  Subject to certain exceptions
contained in the agreement, we are prohibited from using the proceeds to:

         o        pay dividends;

         o        pay for an increase in executive compensation or make any loan
                  or advance to any officer, employee, shareholder,  director or
                  other affiliate of Natural Gas Services Group; or

         o        purchase debt or equity  securities  of any entity  (including
                  our own securities).

         Under the agreement,  for a period of twenty-four  months following the
closing,  CBarney has the right, subject to certain limitations,  to participate
with respect to the issuance of (a) future equity or  equity-linked  securities,
and (b) debt which is  convertible  into  equity or in which  there is an equity
component  (collectively,  the "Additional  Securities"),  on the same terms and
conditions as offered by Natural Gas Services Group to other  purchasers of such
Additional Securities. CBarney's participation right does not apply to:

         o        the issuance or sale of  securities  to  employees,  officers,
                  directors,  or  consultants  of Natural Gas Services Group for
                  the  primary   purpose  of  soliciting   or  retaining   their
                  employment  or service  pursuant  to a stock  option  plan (or
                  similar  equity  incentive  plan)  approved  by the  Board  of
                  Directors and the shareholders of Natural Gas Services Group;

         o        the conversion of any  convertible  or exercisable  securities
                  outstanding as of the closing;




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         o        the issuance of shares of common stock of Natural Gas Services
                  Group in connection with an underwritten public offering; or

         o        the  issuance  of  securities  in  connection   with  mergers,
                  acquisitions,   strategic   business   partnerships  or  joint
                  ventures.

         Natural Gas Services  Group did not engage any  underwriters,  brokers,
agents or finders in  connection  with the agreement or the issuance and sale of
the shares.

         CBarney and its representatives and agents have the right, no more than
twice in any year,  to visit and  inspect any of the  properties  of Natural Gas
Services Group, to examine its books of account and records,  and to discuss the
affairs,  finances and accounts of Natural Gas Services Group with our officers,
employees  and  independent  public  accountants.  We also  agreed  to  permit a
representative selected by CBarney to attend and observe Board meetings, subject
to certain conditions.

         The issuance and sale of the common stock was made in reliance upon the
exemption from registration under Section 4(2) of the Securities Act of 1933, as
amended, as a transaction not involving a public offering. All of the shares are
"restricted"  securities within the meaning of Rule 144 under the Securities Act
and will bear a legend to that effect. However, we agreed to file a registration
statement with the Securities and Exchange Commission within the next sixty days
to register the resale of the common stock.

         The foregoing is a summary of the material  features of the  agreement.
This summary does not purport to be complete and is qualified in its entirety by
reference  to the  terms of the  agreement,  which  is  incorporated  herein  by
reference.

         A press release dated August 4, 2004, announcing the agreement is filed
herewith as Exhibit 99.1 and is also incorporated herein by reference.










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Item 7.  Financial Statements and Exhibits.

         (c)      Exhibits

         The Exhibits listed below are filed as part of this Current Report on
Form 8-K.

                  Exhibit No.                        Description

                      4.1           Securities  Purchase  Agreement,  dated July
                                    20,  2004,   between  Natural  Gas  Services
                                    Group,  Inc. and CBarney  Investments,  Ltd.
                                    (Incorporated by reference to Exhibit 4.1 of
                                    the Registrant's Current Report on Form 8-K,
                                    dated  July 20,  2004,  and  filed  with the
                                    Securities  and Exchange  Commission on July
                                    27, 2004)


                      99.1          Press Release  dated August 4, 2004,  issued
                                    by Natural Gas Services Group, Inc.



















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                                   SIGNATURES

         Pursuant to the  requirements  of the Securities  Exchange Act of 1934,
the  Registrant  has duly  caused  this report to be signed on its behalf by the
undersigned hereunto duly authorized.


                                         NATURAL GAS SERVICES GROUP, INC.



                                         By:      /s/ Wallace C. Sparkman
                                            ------------------------------------
                                                Wallace C. Sparkman, President


Dated:  August 9, 2004


























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