[Form 4] NATURAL GAS SERVICES GROUP INC Insider Trading Activity

Rhea-AI Filing Summary

Brian L. Tucker, President & COO of Natural Gas Services Group, Inc. (NGS), reported transactions dated 10/09/2025. The filing shows 2,121 shares acquired in connection with the vesting of restricted stock units (RSUs), which the company states convert one-for-one into common shares without payment. The same report records a disposition of 644 shares at a price of $27.10. After these transactions the reported beneficial ownership counts for the reporting person are shown as 5,843 and 5,199 shares in the non-derivative section and multiple RSU balances of 2,120, 7,529, and 9,014 in the derivative/RSU section.

Insights

Corporate Insider

Insider received vested RSUs and executed a small sale the same day.

The report documents the vesting of 2,121 RSUs that converted into the same number of common shares, increasing the reporting person’s direct holdings. The filing also shows a concurrent sale or disposition of 644 shares at $27.10.

The combination of vesting plus a partial sale is a routine liquidity action for insiders after RSU vesting. Monitor subsequent Section 16 filings for any additional sales or open-market purchases over the next few reporting periods to understand ongoing insider liquidity patterns.

Compensation Analyst

RSU vesting is part of equity compensation; no cash payment was required for conversion.

The explanatory note states each RSU represents the right to one share upon vesting without payment, so the 2,121 shares reflect compensation realization rather than a new grant issuance. The presence of multiple RSU balances (2,120, 7,529, 9,014) indicates outstanding unvested or previously reported awards.

Material implications are limited to dilution and executive compensation accounting; watch for future disclosures on grant schedules or equity-based expense in upcoming periodic reports within the next fiscal quarter.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Tucker Brian L

(Last) (First) (Middle)

1250 NE LOOP 410

#1000

(Street)

SAN ANTONIO TX 78209

(City) (State) (Zip)

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)
	President & COO

3. Date of Earliest Transaction (Month/Day/Year)
10/09/2025

4. If Amendment, Date of 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

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	10/09/2025		A		2,121	A	(1)	5,843	D
Common Stock	10/09/2025		F		644	D	$27.1	5,199	D

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 Securities Underlying Derivative Security (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: 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
Restricted Stock Units	(2)	10/09/2025		M		2,121		(2)	(2)	Common Stock	2,121	$0	2,120	D
Restricted Stock Units	(2)							(2)	(2)	Common Stock	7,529		7,529	D
Restricted Stock Units	(2)							(2)	(2)	Common Stock	9,014		9,014	D

Explanation of Responses:

1. Not applicable. Represents shares acquired in connection with the vesting of a Restricted Stock Unit ("RSU") award.

2. Not applicable. Each RSU represents the right to receive one share of the Company's common stock upon vesting without payment.

	Brian L. Tucker	10/10/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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