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

Rhea-AI Filing Summary

Natural Gas Services Group (NGS) reported insider activity by its President & COO on 11/03/2025. The filing shows multiple share acquisitions tied to equity awards vesting and a single disposition.

The officer acquired common stock upon vesting of RSUs and PSUs in amounts of 128, 2,486, 1,909, 6,250, and 1,910 shares. A disposition of 3,849 shares at $27.84 per share was reported under code F. Following these transactions, the officer beneficially owned 14,033 shares directly.

The footnotes state certain unvested RSUs were forfeited in connection with the reporting person’s retirement.

Insights

Corporate Governance Analyst

Officer equity vests and forfeitures tied to retirement; routine tax withholding sale; ownership updated.

The President & COO reported several equity events on 11/03/2025: RSUs and PSUs vested into common stock, and a sale coded "F" for 3,849 shares at $27.84 to satisfy taxes. Following these, direct beneficial ownership stands at 14,033 shares. These are non‑open‑market, administrative transactions tied to equity award mechanics.

The filing also notes forfeitures of unvested awards due to the reporting person’s retirement: 1,992 RSUs from the 2023 grant, 5,043 from 2024, and 7,105 from 2025. RSUs/PSUs convert one-for-one into common stock upon vesting with no exercise price, so forfeitures reduce future dilution. No derivative awards remain from the listed grants after these actions.

Key dependencies to monitor are any separate disclosure detailing the retirement’s effective date and transition arrangements, typically via an 8‑K. Items to watch include whether additional equity settlements, clawbacks, or separation terms are later disclosed and any changes to share counts in subsequent reports over the near term.

Insider Trade Summary

4,523 shares exercised/converted

Mixed 9 txns

Insider Tucker Brian L

Role President & COO

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units	128	$0.00	--
Exercise	Restricted Stock Units	2,486	$0.00	--
Exercise	Restricted Stock Units	1,909	$0.00	--
Grant/Award	Common Stock	128	$0.00	--
Grant/Award	Common Stock	2,486	$0.00	--
Grant/Award	Common Stock	1,909	$0.00	--
Grant/Award	Common Stock	6,250	$0.00	--
Grant/Award	Common Stock	1,910	$0.00	--
Tax Withholding	Common Stock	3,849	$27.84	$107K

Holdings After Transaction: Restricted Stock Units — 0 shares (Direct); Common Stock — 5,327 shares (Direct)

Footnotes (1)

1. Not applicable. Represents shares acquired in connection with the vesting of a Restricted Stock Unit ("RSU") award. Not applicable. Represents shares acquired in connection with the vesting of A Performance Share Award ("PSU"). Not applicable. Each RSU and/or PSU represents the right to receive one share of the Company's common stock upon vesting without payment. A total of 1,992 RSUs from the 2023 RSU Grant were forfeited in connection with the reporting person's retirement. A total of 5,043 RSUs from the 2024 RSU Grant were forfeited in connection with the reporting person's retirement. A total of 7,105 RSUs from the 2025 RSU Grant were forfeited in connection with the reporting person's retirement.

Form 4 Insider Transactions: What Each Field Means →

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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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)
11/03/2025

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	11/03/2025		A		128	A	(1)	5,327	D
Common Stock	11/03/2025		A		2,486	A	(1)	7,813	D
Common Stock	11/03/2025		A		1,909	A	(1)	9,722	D
Common Stock	11/03/2025		A		6,250	A	(2)	15,972	D
Common Stock	11/03/2025		A		1,910	A	(2)	17,882	D
Common Stock	11/03/2025		F		3,849	D	$27.84	14,033	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	(3)	11/03/2025		M		128		(3)	(3)	Common Stock	128	$0	0(4)	D
Restricted Stock Units	(3)	11/03/2025		M		2,486		(3)	(3)	Common Stock	2,486	$0	0(5)	D
Restricted Stock Units	(3)	11/03/2025		M		1,909		(3)	(3)	Common Stock	1,909	$0	0(6)	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. Represents shares acquired in connection with the vesting of A Performance Share Award ("PSU").

3. Not applicable. Each RSU and/or PSU represents the right to receive one share of the Company's common stock upon vesting without payment.

4. A total of 1,992 RSUs from the 2023 RSU Grant were forfeited in connection with the reporting person's retirement.

5. A total of 5,043 RSUs from the 2024 RSU Grant were forfeited in connection with the reporting person's retirement.

6. A total of 7,105 RSUs from the 2025 RSU Grant were forfeited in connection with the reporting person's retirement.

	Brian L. Tucker	11/03/2025
	** Signature of Reporting Person	Date
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