ngs-20260709

(Exact Name of Registrant as Specified in Charter)

Colorado

1-31398

75-2811855

(State or Other Jurisdiction

of Incorporation)

(Commission File Number)

(IRS Employer Identification No.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

Securities registered pursuant to Section 12(b) of the Act:

Title of each class

Trading Symbol

Name of each exchange on which registered

Common Stock, Par Value $0.01

NGS

NYSE

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o

(a)On July 9, 2026, Natural Gas Services Group, Inc., (the “Company”) was advised by Ham, Langston & Brezina, L.L.P. (“HL&B”), the Company’s independent registered public accounting firm, that HL&B completed a transaction pursuant to which, among other things, CohnReznick LLP (“CohnReznick”) acquired certain assets of HL&B. In connection with the closing of this transaction, on July 9, 2026, HL&B resigned as the Company’s independent registered public accounting firm.

(b) On July 9, 2026 the Company’s Board of Directors (the “Board”) upon recommendation of the Audit Committee of the Board approved the appointment of CohnReznick as the Company’s new independent registered public accounting firm for the fiscal year ending December 31, 2026.

The audit reports of HL&B on the Company’s consolidated financial statements as of and for the years ended December 31, 2025 and 2024, did not contain an adverse opinion or a disclaimer of opinion, nor were they qualified or modified as to uncertainty, audit scope or accounting principles.

During the years ended December 31, 2025 and 2024, and the subsequent interim period through July 9, 2026, there were no (a) disagreements with HL&B on any matter of accounting principles or practices, financial statement disclosure, or auditing scope or procedure, which, if not resolved to HL&B’s satisfaction, would have caused it to make reference to the subject matter of the disagreement in connection with its reports on the Company’s financial statements, or (b) “reportable events” requiring disclosure pursuant to Item 304(a)(1)(v) of Regulation S-K.

The Company provided HL&B with a copy of the foregoing disclosures the Company is making in response to Item 4.01 in this Current Report on Form 8-K prior to its filing with the Securities and Exchange Commission (the “Commission”) and requested that HL&B furnish the Company with a letter addressed to the Commission stating whether it agrees with the above statements and, if it does not agree, the respects in which it does not agree. A copy of HL&B’s letter to the Commission, dated July 10, 2026, is attached hereto as Exhibit 16.1.

During the years ended December 31, 2025 and 2024, and the subsequent interim period through the date of this Current Report on Form 8-K, neither the Company, nor anyone on its behalf, consulted with CohnReznick regarding: (i) either the application of accounting principles to a specified transaction, either completed or proposed, or the type of audit opinion that might be rendered on the Company’s financial statements; or (ii) any matter that was either the subject of a “disagreement,” as defined in Item 304(a)(1)(iv) of Regulation S-K and the related instructions to that item, or a “reportable event,” as described in Item 304(a)(1)(v) of Regulation S-K.


Exhibit No.			Description
16.1			Letter to the Securities and Exchange Commission from Ham, Langston & Brezina, L.L.P., dated July 10, 2026.
104			Cover Page Interactive Data File (embedded within the Inline XBRL document).

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.


Item 4.01.			Changes in Registrant's Certifying Accountant.