Item 4.01 Changes in Registrant's Certifying Accountant. On May 26, 2022 Moss Adams LLP ("Moss Adams") informed Natural Gas Services Group, Inc. (the "Company") that it would resign as its independent registered public accounting firm effective June 8, 2022.

During the Company's fiscal years ending December 31, 2020 and December 31, 2021 and the interim period ending March 31, 2022, there have been no disagreements with Moss Adams on matters of accounting principles or practices, financial statement disclosure or auditing scope or procedure which, if not resolved to the satisfaction of Moss Adams would have caused Moss Adams to make reference to such matter in connection with its report.

The resignation of Moss Adams was accepted by the Audit Committee of the Board of Directors of the Company on May 26, 2022.

For the past two fiscal years and subsequent interim period through the date of resignation, there were no disagreements with Moss Adams on any matter of accounting principles or practices, financial statement disclosure, or auditing scope or procedure which, if not resolved to Moss Adams satisfaction, would have caused it to make reference to the subject matter of disagreement(s) in connection with its reports on the financial statements of the Company.

Moss Adams reports on the financial statements for the past two fiscal years did not contain any adverse opinion or disclaimer of opinion and were not qualified or modified as to uncertainty, audit scope or accounting principles.

None of the reportable events described under Item 304(a)(1)(v)(A)-(D) of Regulation S-K occurred within the Company's last two fiscal years , and subsequently up to the date of resignation.

The Company has furnished Moss Adams with a copy of the foregoing disclosure and requested Moss Adams to furnish it with a letter addressed the U.S. Securities and Exchange Commission (the "SEC") stating whether or not it agrees with the foregoing statements. A copy of the letter from Moss Adams to the SEC dated June 2, 2022 is attached as an exhibit hereto.

The Company is in the process of selecting a successor independent registered public accounting firm. The Company will provide information on the selection on Form 8-K once such successor is identified.

Although the Company included a proposal seeking shareholder ratification of Moss Adams as the Company's independent registered public accounting firm at the Annual Meeting of Shareholders to be held on June 16, 2022, votes on that proposal will not be counted or reported considering Moss Adams' resignation.




Item 9.01. Financial Statements and Exhibits.
(d)     Exhibits
The Exhibit listed below is furnished as an Exhibit to this Current Report on
Form 8-K.
Exhibit No.       Description
  16.1            Letter to the SEC from Moss Adams LLP, dated June 2, 2022.
104               Cover Page Interactive Data File (embedded within the Inline XBRL document).

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