| Apr 6, 2018 FForm 4 → | Apr 10, 12:07 pm EDT | NATURAL GAS SERVICES GROUP INCNGS | 2,735 | $24.50 | $67,008 | 58,034 | — | plan? |
| Mar 23, 2018 FMForm 4 → | Mar 27, 2:22 pm EDT | NATURAL GAS SERVICES GROUP INCNGS | 5,513 | $23.90 | $12,261 | 60,769 | — | plan? |
| Mar 15, 2018 AForm 4 → | Mar 19, 5:17 pm EDT | NATURAL GAS SERVICES GROUP INCNGS | 16,000 | $24.55 | $392,800 | 61,282 | — | plan? |
| Jan 25, 2018 SForm 4 → | Jan 29, 11:02 am EST | NATURAL GAS SERVICES GROUP INCNGS | 102 | $28.90 | $2,948 | 45,282 | −0.22% | plan? |
| Jan 25, 2018 MForm 4 → | Jan 29, 11:02 am EST | NATURAL GAS SERVICES GROUP INCNGS | 102 | $17.51 | $1,786 | 45,384 | — | plan? |
| Jan 22, 2018 SForm 4 → | Jan 24, 5:32 pm EST | NATURAL GAS SERVICES GROUP INCNGS | 1,890 | $28.95 | $54,721 | 44,430 | −4.08% | plan? |
| Jan 22, 2018 MForm 4 → | Jan 24, 5:32 pm EST | NATURAL GAS SERVICES GROUP INCNGS | 1,377 | $17.51 | $24,111 | 44,630 | — | plan? |
| Jan 17, 2018 SForm 4/A → | Jan 26, 1:45 pm EST | NATURAL GAS SERVICES GROUP INCNGS | 1,349 | $29.01 | $39,134 | 45,282 | −2.89% | plan? |
| Jan 12, 2018 SForm 4 → | Jan 17, 6:01 pm EST | NATURAL GAS SERVICES GROUP INCNGS | 6,410 | $28.98 | $185,767 | 44,943 | −12.5% | plan? |
| Jan 12, 2018 MForm 4 → | Jan 17, 6:01 pm EST | NATURAL GAS SERVICES GROUP INCNGS | 3,521 | $17.51 | $61,653 | 48,636 | — | plan? |
| Sep 26, 2017 SForm 4 → | Sep 28, 2:27 pm EDT | NATURAL GAS SERVICES GROUP INCNGS | 12,350 | $28.02 | $346,000 | 47,832 | −20.5% | plan? |
| May 2, 2017 SForm 4 → | May 4, 4:44 pm EDT | NATURAL GAS SERVICES GROUP INCNGS | 400 | $28.01 | $11,204 | 60,182 | −0.66% | plan? |
| Apr 11, 2017 FForm 4 → | Apr 12, 5:22 pm EDT | NATURAL GAS SERVICES GROUP INCNGS | 2,758 | $27.50 | $75,845 | 60,582 | — | plan? |
| Apr 11, 2017 SForm 4 → | Apr 12, 5:22 pm EDT | NATURAL GAS SERVICES GROUP INCNGS | 2,550 | $28.52 | $72,726 | 63,340 | −3.87% | plan? |
| Mar 21, 2017 AForm 4 → | Mar 27, 6:25 pm EDT | NATURAL GAS SERVICES GROUP INCNGS | 5,000 | $25.05 | $125,250 | 65,890 | — | plan? late |
| Nov 22, 2016 SForm 4 → | Nov 23, 12:53 pm EST | NATURAL GAS SERVICES GROUP INCNGS | 3,333 | $28.67 | $95,557 | 60,890 | −5.19% | plan? |
| Jun 23, 2016 SForm 4 → | Jun 24, 2:56 pm EDT | NATURAL GAS SERVICES GROUP INCNGS | 3,500 | $23.92 | $83,720 | 64,223 | −5.17% | plan? |
| Apr 6, 2016 AForm 4 → | Apr 8, 7:16 pm EDT | NATURAL GAS SERVICES GROUP INCNGS | 20,000 | $20.39 | $407,800 | 74,856 | — | plan? |
| Mar 19, 2016 FForm 4 → | May 12, 5:14 pm EDT | NATURAL GAS SERVICES GROUP INCNGS | 5,633 | $21.60 | $121,673 | 67,723 | — | plan? late |
| Dec 17, 2015 SForm 4 → | Dec 21, 7:01 pm EST | NATURAL GAS SERVICES GROUP INCNGS | 4,500 | $20.43 | $91,955 | 53,356 | −7.78% | plan? |
| Dec 15, 2015 SForm 4 → | Dec 17, 5:27 pm EST | NATURAL GAS SERVICES GROUP INCNGS | 2,000 | $19.91 | $39,820 | 61,922 | −3.13% | plan? |
| Jun 30, 2015 SForm 4 → | Jul 2, 11:41 am EDT | NATURAL GAS SERVICES GROUP INCNGS | 2,500 | $22.00 | $55,000 | 63,922 | −3.76% | plan? |
| Jun 19, 2015 SForm 4 → | Jun 22, 7:26 pm EDT | NATURAL GAS SERVICES GROUP INCNGS | 2,500 | $23.32 | $58,300 | 66,422 | −3.63% | plan? |
| Jun 17, 2015 SForm 4 → | Jun 18, 5:52 pm EDT | NATURAL GAS SERVICES GROUP INCNGS | 3,372 | $23.20 | $78,230 | 68,922 | −4.66% | plan? |
| Jun 10, 2015 SForm 4 → | Jun 12, 3:22 pm EDT | NATURAL GAS SERVICES GROUP INCNGS | 6,628 | $23.97 | $158,873 | 68,228 | −8.85% | plan? |
| Mar 19, 2015 AForm 4 → | Mar 23, 7:25 pm EDT | NATURAL GAS SERVICES GROUP INCNGS | 20,000 | $18.75 | $375,000 | 80,010 | — | plan? |
| Jan 25, 2015 FForm 4 → | Jun 12, 1:58 pm EDT | NATURAL GAS SERVICES GROUP INCNGS | 5,154 | $20.19 | $104,047 | 74,856 | — | plan? late |