| 2006-01-19 | Sale | Natural Gas Services Group, Inc. NGS | 10 percent owner | 318,400 2.9341% | $19.84 | $6.32M | -31.69% | |
| 2005-12-09 | Sale | Natural Gas Services Group, Inc. NGS | 10 percent owner | 1,600 0.017% | $24.01 | $38,420 | -31.94% | |
| 2005-12-08 | Sale | Natural Gas Services Group, Inc. NGS | 10 percent owner | 20,000 0.2053% | $24.00 | $480,000 | -33.98% | |
| 2005-12-07 | Sale | Natural Gas Services Group, Inc. NGS | 10 percent owner | 20,000 0.2083% | $24.00 | $480,000 | -33.04% | |
| 2005-12-06 | Sale | Natural Gas Services Group, Inc. NGS | 10 percent owner | 20,000 0.2075% | $24.05 | $481,000 | -33.39% | |
| 2005-12-05 | Sale | Natural Gas Services Group, Inc. NGS | 10 percent owner | 120,000 1.241% | $24.52 | $2.94M | -34.86% | |
| 2005-03-04 | Natural Gas Services Group, Inc. NGS | 10 percent owner | 106,800 1.6022% | $10.88 | $1.16M | +61.13% |