| 2017-06-05 | Sale | Natural Gas Services Group, Inc. NGS | director | 1,500 0.0118% | $26.86 | $40,290 | -4.87% | |
| 2013-09-05 | Sale | Natural Gas Services Group, Inc. NGS | director | 20,000 0.1642% | $27.68 | $553,600 | +7.96% | |
| 2013-05-14 | Sale | Natural Gas Services Group, Inc. NGS | director | 20,000 0.1618% | $22.35 | $447,000 | +22.89% | |
| 2012-12-03 | Sale | Natural Gas Services Group, Inc. NGS | director | 20,000 0.1613% | $16.23 | $324,600 | +40.52% | |
| 2012-05-22 | Sale | Natural Gas Services Group, Inc. NGS | director | 7,500 0.0618% | $13.45 | $100,864 | +18.43% | |
| 2008-05-12 | Sale | Natural Gas Services Group, Inc. NGS | director | 24,000 0.1985% | $26.43 | $634,394 | -55.3% | |
| 2008-05-09 | Sale | Natural Gas Services Group, Inc. NGS | director | 16,000 0.1298% | $26.34 | $421,419 | -56.07% | |
| 2006-03-08 | Sale | Natural Gas Services Group, Inc. NGS | director | 100,000 1.0055% | $16.49 | $1.65M | -14.14% |