| SC 13G/A | 2024-02-09 | DIMENSIONAL FUND ADVISORS LP | NATURAL GAS SERVICES GROUP INC | 891,342 | 7.2% | EDGAR |
| SC 13G | 2024-02-08 | AEGIS FINANCIAL CORP | NATURAL GAS SERVICES GROUP INC | 854,695 | 6.9% | EDGAR |
| SC 13G/A | 2023-06-12 | FMR LLC | NATURAL GAS SERVICES GROUP INC | 346,396 | 2.8% | EDGAR |
| SC 13D/A | 2023-05-03 | Mill Road Capital III, L.P. | NATURAL GAS SERVICES GROUP INC | 912,408 | 7.3% | EDGAR |
| SC 13D/A | 2023-03-10 | Mill Road Capital III, L.P. | NATURAL GAS SERVICES GROUP INC | 905,008 | 7.3% | EDGAR |
| SC 13G/A | 2023-02-14 | AWM Investment Company, Inc. | NATURAL GAS SERVICES GROUP INC | 769,233 | 6.2% | EDGAR |
| SC 13G/A | 2023-02-10 | DIMENSIONAL FUND ADVISORS LP | NATURAL GAS SERVICES GROUP INC | 925,630 | 7.5% | EDGAR |
| SC 13G/A | 2023-02-09 | FMR LLC | NATURAL GAS SERVICES GROUP INC | 1,074,087 | 8.6% | EDGAR |
| SC 13D/A | 2023-01-11 | Hoak Public Equities, LP | NATURAL GAS SERVICES GROUP INC | 1,150,000 | 9.3% | EDGAR |
| SC 13D/A | 2022-12-30 | Hoak Public Equities, LP | NATURAL GAS SERVICES GROUP INC | 1,150,000 | 9.3% | EDGAR |
| SC 13D/A | 2022-12-23 | Mill Road Capital III, L.P. | NATURAL GAS SERVICES GROUP INC | 815,108 | 6.6% | EDGAR |
| SC 13D/A | 2022-12-09 | Hoak Public Equities, LP | NATURAL GAS SERVICES GROUP INC | 1,150,000 | 9.3% | EDGAR |
| SC 13D | 2022-11-28 | Hoak Public Equities, LP | NATURAL GAS SERVICES GROUP INC | 1,000,000 | 8.0% | EDGAR |
| SC 13G/A | 2022-03-10 | FMR LLC | NATURAL GAS SERVICES GROUP INC | 1,315,540 | 10.1% | EDGAR |
| SC 13G | 2022-02-11 | AWM Investment Company, Inc. | NATURAL GAS SERVICES GROUP INC | 678,008 | 5.2% | EDGAR |
| SC 13G | 2022-02-11 | AWM Investment Company, Inc. | NATURAL GAS SERVICES GROUP INC | 1,414,172 | 10.0% | EDGAR |
| SC 13G/A | 2022-02-09 | FMR LLC | NATURAL GAS SERVICES GROUP INC | 1,207,175 | 9.3% | EDGAR |
| SC 13G/A | 2022-02-08 | DIMENSIONAL FUND ADVISORS LP | NATURAL GAS SERVICES GROUP INC | 943,255 | 7.2% | EDGAR |
| SC 13G/A | 2022-02-02 | FRANKLIN MUTUAL ADVISERS LLC | NATURAL GAS SERVICES GROUP INC | 768,834 | 5.9% | EDGAR |
| SC 13D | 2021-04-15 | NATURAL GAS SERVICES GROUP INC | NATURAL GAS SERVICES GROUP INC | 681,118 | 5.0% | EDGAR |