| 2021-08-02 | Sale | Waste Management, Inc. WM | director | 604 0.0001% | $146.91 | $88,733 | +6.82% | |
| 2021-02-16 | Sale | Proto Labs, Inc. PRLB | President and CEO | 18,910 0.0718% | $188.21 | $3.56M | -57.31% | |
| 2020-09-03 | Sale | Proto Labs, Inc. PRLB | President and CEO | 17,990 0.0673% | $154.95 | $2.79M | -18.69% | |
| 2017-02-15 | Sale | Proto Labs, Inc. PRLB | President and CEO | 2,025 0.0077% | $56.80 | $115,025 | +26.63% | |
| 2016-09-01 | Proto Labs, Inc. PRLB | President and CEO | 1,900 0.0071% | $53.20 | $101,081 | +2.92% | ||
| 2014-02-13 | Proto Labs, Inc. PRLB | President and CEO | 3,200 0.0125% | $78.64 | $251,638 | -13.6% |