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

Rhea-AI Filing Summary

Stephen C. Taylor, a director of Natural Gas Services Group, sold 6,553 shares of NGS common stock on 09/17/2025 under a Rule 10b5-1 trading plan at a weighted average price of $27.507 per share. After the sale, Mr. Taylor directly beneficially owns 398,590 shares. He also has an indirect interest in 114,213 shares held in a Rabbi Trust and holds 4,456 restricted stock units that convert to common shares upon vesting.

The Form 4 discloses that the sales were effected pursuant to a 10b5-1 plan established on May 16, 2025, and that the shares were sold in multiple transactions at prices ranging from $27.50 to $27.59. The filing is signed by Stephen C. Taylor and dated 09/17/2025.

Positive

• Sale executed under a Rule 10b5-1 trading plan, indicating the transactions were pre-planned
• Reporting person retains substantial equity: 398,590 shares directly and 114,213 indirectly in a Rabbi Trust
• Restricted Stock Units disclosed: 4,456 RSUs that will convert to common stock upon vesting

Negative

• Insider sold 6,553 shares, which is a reduction in direct holdings on 09/17/2025
• Sale proceeds realized at market prices between $27.50 and $27.59, reducing the reporting person’s direct stake

Insights

Corporate Governance Expert

TL;DR: Director executed pre-established 10b5-1 plan sale; retains sizeable direct and indirect ownership positions.

The filing documents a routine insider sale executed under a Rule 10b5-1 plan, which provides an affirmative defense against insider trading allegations when properly established. The director disposed of 6,553 shares at a weighted average price of $27.507, with sales occurring between $27.50 and $27.59. Post-transaction, he retains 398,590 shares directly and an additional 114,213 shares indirectly via a Rabbi Trust, plus 4,456 RSUs subject to vesting. From a governance perspective, the combination of a publicly disclosed trading plan and continued substantial ownership suggests alignment with long-term shareholders while allowing for liquidity events.

Securities Analyst

TL;DR: Small-scale sale relative to holdings; transaction provides limited incremental market impact.

The sale of 6,553 shares is explicitly tied to a 10b5-1 plan established May 16, 2025, and executed on 09/17/2025 at a weighted average price of $27.507. The director’s retained direct stake of 398,590 shares plus 114,213 indirect shares and 4,456 RSUs indicates meaningful ongoing exposure to company equity. The disclosure supplies precise share counts and price range, enabling investors to quantify the transaction but not implying any new information about company fundamentals.

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).

X

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^*

Taylor Stephen Charles

(Last) (First) (Middle)

404 VETERANS AIRPARK LANE

SUITE 300

(Street)

MIDLAND TX 79705

(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)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
09/17/2025

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	09/17/2025		S		6,553(1)	D	$27.507(2)	398,590	D
Common Stock								114,213	I	Rabbi Trust

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)							(3)	(3)	Common Stock	4,456		4,456	D

Explanation of Responses:

1. The sale reported on this Form 4 was effectuated pursuant to a Rule 10b5-1 trading plan established by the reporting person on May 16, 2025.

2. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $27.50 to $27.59 inclusive. The reporting person undertakes to provide NGS, any security holder of NGS, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.

3. Not applicable. Each Restricted Stock Unit represents the right to receive one share of the Issuer's common stock upon vesting.

	Stephen C. Taylor	09/17/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What did Stephen C. Taylor disclose in the Form 4 for NGS?

He disclosed the sale of 6,553 shares on 09/17/2025 under a Rule 10b5-1 plan and post-transaction beneficial ownership levels.

How many NGS shares does Stephen C. Taylor own after the reported sale?

Directly owns 398,590 shares and indirectly holds 114,213 shares in a Rabbi Trust, plus 4,456 RSUs.

At what price were the NGS shares sold on 09/17/2025?

Weighted average price was $27.507 per share; individual sales occurred between $27.50 and $27.59.

Was the sale part of a 10b5-1 trading plan?

Yes. The Form 4 states the sale was effectuated pursuant to a 10b5-1 plan established May 16, 2025.

How many restricted stock units does the reporting person have?

4,456 RSUs, each representing the right to receive one share upon vesting.