| SC 13G | 2021-02-16 | HARDING LOEVNER LP | Proto Labs Inc | 1,601,298 | 6.0% | EDGAR |
| SC 13G/A | 2021-02-12 | BROWN CAPITAL MANAGEMENT LLC | Proto Labs Inc | 3,704,897 | 13.8% | EDGAR |
| SC 13G | 2021-02-11 | Nikko Asset Management Americas, Inc. | Proto Labs Inc | 1,590,665 | 5.9% | EDGAR |
| SC 13G/A | 2021-02-10 | VANGUARD GROUP INC | Proto Labs Inc | 2,743,050 | 10.2% | EDGAR |
| SC 13G | 2021-02-05 | Sumitomo Mitsui Trust Holdings, Inc. | Proto Labs Inc | 1,590,903 | 5.9% | EDGAR |
| SC 13G/A | 2021-01-25 | RIVERBRIDGE PARTNERS LLC | Proto Labs Inc | 1,358,899 | 5.1% | EDGAR |
| SC 13G | 2021-01-25 | BlackRock Inc. | Proto Labs Inc | 4,349,159 | 16.3% | EDGAR |
| SC 13G | 2020-10-09 | ARK Investment Management LLC | Proto Labs Inc | 3,094,035 | 11.6% | EDGAR |
| SC 13G/A | 2020-02-14 | BROWN CAPITAL MANAGEMENT LLC | Proto Labs Inc | 3,788,628 | 14.2% | EDGAR |
| SC 13G/A | 2020-02-12 | VANGUARD GROUP INC | Proto Labs Inc | 2,681,946 | 10.0% | EDGAR |
| SC 13G/A | 2020-02-05 | RIVERBRIDGE PARTNERS LLC | Proto Labs Inc | 1,510,317 | 5.6% | EDGAR |
| SC 13G/A | 2020-02-04 | BlackRock Inc. | Proto Labs Inc | 4,163,973 | 15.6% | EDGAR |
| SC 13G/A | 2019-03-11 | VANGUARD GROUP INC | Proto Labs Inc | 2,705,535 | 10.0% | EDGAR |
| SC 13G/A | 2019-02-14 | BROWN CAPITAL MANAGEMENT LLC | Proto Labs Inc | 3,712,611 | 13.7% | EDGAR |
| SC 13G/A | 2019-02-12 | VANGUARD GROUP INC | Proto Labs Inc | 2,668,103 | 9.8% | EDGAR |
| SC 13G/A | 2019-01-31 | BlackRock Inc. | Proto Labs Inc | 4,002,278 | 14.8% | EDGAR |
| SC 13G/A | 2019-01-25 | RIVERBRIDGE PARTNERS LLC | Proto Labs Inc | 1,556,828 | 5.8% | EDGAR |
| SC 13G/A | 2019-01-15 | LUKIS LAWRENCE J | Proto Labs Inc | 1,306,840 | 4.8% | EDGAR |
| SC 13G/A | 2018-02-14 | TimesSquare Capital Management, LLC | Proto Labs Inc | 0 | 0.0% | EDGAR |
| SC 13G/A | 2018-02-14 | BROWN CAPITAL MANAGEMENT LLC | Proto Labs Inc | 3,896,579 | 14.6% | EDGAR |