# EDGAR Filing Document

**Accession Number:** 0001084991
**File Stem:** 0001629779-25-000002
**Filing Date:** 2025-11
**Character Count:** 7113
**Document Hash:** 84fc8a205e61862e8f4130625efb6be9
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001629779-25-000002.hdr.sgml**: 20251103

**ACCESSION NUMBER**: 0001629779-25-000002

**CONFORMED SUBMISSION TYPE**: 4

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20251103

**FILED AS OF DATE**: 20251103

**DATE AS OF CHANGE**: 20251103

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Tucker Brian L
- **CENTRAL INDEX KEY:** 0001629779

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-31398
- **FILM NUMBER:** 251445122

**MAIL ADDRESS:**
- **STREET 1:** 1250 NE LOOP 410
- **STREET 2:** #1000
- **CITY:** SAN ANTONIO
- **STATE:** TX
- **ZIP:** 78209
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** NATURAL GAS SERVICES GROUP INC
- **CENTRAL INDEX KEY:** 0001084991
- **STANDARD INDUSTRIAL CLASSIFICATION:** OIL, GAS FIELD SERVICES, NBC [1389]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 752811855
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** 404 VETERANS AIRPARK LANE
- **STREET 2:** SUITE 300
- **CITY:** MIDLAND
- **STATE:** TX
- **ZIP:** 79705
- **BUSINESS PHONE:** (432) 262-2700

**MAIL ADDRESS:**
- **STREET 1:** 404 VETERANS AIRPARK LANE
- **STREET 2:** SUITE 300
- **CITY:** MIDLAND
- **STATE:** TX
- **ZIP:** 79705

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

## FORM 4

### STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

[ ] 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**<sup>*</sup><br>Tucker Brian L<br><sub>(Last) (First) (Middle)</sub><br>1250 NE LOOP 410

#1000<br><sub>(Street)</sub><br>SAN ANTONIO, TX 78209<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2025-11-03 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [ ] 10% Owner<br>[X] Officer (give title below) [ ] Other (specify below)<br>_President & COO_ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>NATURAL GAS SERVICES GROUP INC [ NGS ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[X] Form filed by One Reporting Person<br>[ ] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | 3. Transaction Code (V) | 3. Transaction Code (V) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | Code | V | Amount | (A) or (D) | Price | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| Common Stock | 2025-11-03 |  | A |  | 128 | A | <sup>(1)</sup> | 5327 | D |  |
| Common Stock | 2025-11-03 |  | A |  | 2486 | A | <sup>(1)</sup> | 7813 | D |  |
| Common Stock | 2025-11-03 |  | A |  | 1909 | A | <sup>(1)</sup> | 9722 | D |  |
| Common Stock | 2025-11-03 |  | A |  | 6250 | A | <sup>(2)</sup> | 15972 | D |  |
| Common Stock | 2025-11-03 |  | A |  | 1910 | A | <sup>(2)</sup> | 17882 | D |  |
| Common Stock | 2025-11-03 |  | F |  | 3849 | D | $27.84 | 14033 | D |  |

---

## Table II - Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | 4. Transaction Code (V) | 4. Transaction Code (V) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 6. Date Exercisable and Expiration Date | 6. Date Exercisable and Expiration Date | 7. Title and Amount of Underlying Securities | 7. Title and Amount of Underlying Securities | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | Code | V | (A) | (D) | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| Restricted Stock Units | <sup>(3)</sup> | 2025-11-03 |  | M |  | 128 |  | <sup>(3)</sup> | <sup>(3)</sup> | Common Stock | 128 | $0 | 0<sup>(4)</sup> | D |  |
| Restricted Stock Units | <sup>(3)</sup> | 2025-11-03 |  | M |  | 2486 |  | <sup>(3)</sup> | <sup>(3)</sup> | Common Stock | 2486 | $0 | 0<sup>(5)</sup> | D |  |
| Restricted Stock Units | <sup>(3)</sup> | 2025-11-03 |  | M |  | 1909 |  | <sup>(3)</sup> | <sup>(3)</sup> | Common Stock | 1909 | $0 | 0<sup>(6)</sup> | D |  |

---

### Footnotes:

(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.

**Signature:** Brian L. Tucker  
**Date:** 2025-11-03

### Remarks:

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.**