SEC Form 4 · Updated Daily
PRLB
— Proto Labs, Inc. OwnershipInsider and institutional ownership derived from SEC Form 4 filings. Click any owner to see their holdings across every company they’ve filed on, and how their position has changed over time.
Current Reporting Owners
| Owner | Role | Shares Owned | As Of | Last Activity |
|---|---|---|---|---|
| DAMORE RICHARD A | Director | 2,004,290 | 2013-02-21 | J |
| ANDERSON EDWARD T | 10%+ Owner | 2,004,290 | 2013-02-21 | J |
| NBGE GP, LLC | 10%+ Owner | 2,004,290 | 2013-02-21 | J |
| North Bridge Growth Management, L.P. | 10%+ Owner | 2,004,290 | 2013-02-21 | J |
| NBGE Manager, LLC | 10%+ Owner | 2,004,290 | 2013-02-21 | J |
| NORTH BRIDGE GROWTH EQUITY I LP | 10%+ Owner | 2,004,290 | 2013-02-21 | J |
| LUKIS LAWRENCE J | Director | 1,881,840 | 2015-08-31 | G |
| Protomold Investment Company, LLC | 10%+ Owner | 1,730,076 | 2012-08-22 | J |
| Kubicek Mark R. | Officer | 145,000 | 2012-10-02 | S |
| Bodor Robert | Officer | 108,579 | 2025-02-25 | A |
| HOLT VICTORIA M | Director | 77,369 | 2021-02-16 | M |
| JUDD JOHN R | Officer | 77,230 | 2014-07-31 | M |
| LOFTUS MARGARET A | Director | 66,012 | 2014-03-13 | M |
| Gawlick Rainer | Director | 46,093 | 2026-05-19 | A |
| Baker Arthur R. III | Officer | 36,695 | 2022-02-15 | A |
| Ryaboy Oleg | Officer | 35,305 | 2025-02-25 | A |
| Schumacher Daniel | Officer | 35,019 | 2026-09-24 | S |
| Kenison Michael R. | Officer | 34,713 | 2026-05-12 | M |
| WAY JOHN | Officer | 33,657 | 2021-02-16 | A |
| Dietrick William M. | Officer | 33,250 | 2013-01-16 | M |
| WEHRWEIN SVEN | Director | 33,005 | 2026-06-02 | S |
| Schneider Jacqueline D. | Officer | 30,671 | 2016-04-04 | M |
| Krishna Suresh | Director | 30,147 | 2026-05-23 | F |
| Black Archie C. | Director | 28,428 | 2026-05-19 | A |
| Tumelty John B. | Officer | 27,325 | 2017-11-22 | M |
| Chand Sujeet | Director | 26,863 | 2026-05-19 | A |
| KRANTZ DONALD G | Director | 26,863 | 2026-05-19 | A |
| Klaas Bjoern | Officer | 23,046 | 2024-02-13 | A |
| Chin Moonhie | Director | 22,306 | 2026-05-19 | A |
| Greiner Stacy | Director | 19,644 | 2025-05-23 | A |
| Goodman John B | Director | 14,106 | 2021-05-18 | A |
| FEIN DAVID M | Officer | 12,009 | 2019-02-13 | F |
| KINGSLEY DOUGLAS A | Director | 9,330 | 2013-02-21 | J |
| Langton William R. | Officer | 8,250 | 2012-10-02 | M |
| Kermisch Marc | Officer | 6,513 | 2026-02-25 | A |
| KOHRS DOUGLAS W | Director | 4,783 | 2015-05-20 | A |
| Smith Brian K | Director | 4,778 | 2016-05-19 | A |
| Parlange Bernardo | Officer | 2,109 | 2026-05-20 | A |
| Bolton Edward E. | Officer | 1,805 | 2013-05-09 | M |
| Blodgett Matthew C | Director | 1,149 | 2013-07-09 | J |
| Cleveland Bradley A. | Director | 798 | 2014-05-20 | A |
| Pang Thomas H | Officer | 0 | 2012-02-23 | — |
Recent Filings
| Date | Owner | Activity | Shares | Price | Owned After |
|---|---|---|---|---|---|
| 2026-09-24 | Schumacher Daniel | Open-market sale | 5,000 | $95.32 | 35,019 |
| 2026-09-17 | Schumacher Daniel | Open-market sale | 4,900 | $85.21 | 40,019 |
| 2026-09-16 | Schumacher Daniel | Open-market sale | 100 | $85.00 | 44,919 |
| 2026-06-02 | WEHRWEIN SVEN | Open-market sale | 500 | $78.38 | 32,505 |
| 2026-06-02 | WEHRWEIN SVEN | Open-market sale | 1,500 | $76.91 | 33,005 |
| 2026-05-23 | Krishna Suresh | Tax withholding | 1,247 | $71.36 | 30,147 |
| 2026-05-20 | Parlange Bernardo | Grant / award (derivative) | 3,789 | $0.00 | 3,789 |
| 2026-05-20 | Parlange Bernardo | Grant / award | 2,109 | $0.00 | 2,109 |
| 2026-05-20 | Schumacher Daniel | Tax withholding | 255 | $71.13 | 45,019 |
| 2026-05-19 | KRANTZ DONALD G | Grant / award | 2,210 | $0.00 | 26,863 |
| 2026-05-19 | WEHRWEIN SVEN | Grant / award | 2,210 | $0.00 | 34,505 |
| 2026-05-19 | Gawlick Rainer | Grant / award | 2,210 | $0.00 | 46,093 |
| 2026-05-19 | Chin Moonhie | Grant / award | 2,210 | $0.00 | 22,306 |
| 2026-05-19 | Chand Sujeet | Grant / award | 2,210 | $0.00 | 26,863 |
| 2026-05-19 | Black Archie C. | Grant / award | 2,210 | $0.00 | 28,428 |
| 2026-05-12 | Kenison Michael R. | Option exercise (derivative) | 4,042 | $0.00 | 0 |
| 2026-05-12 | Kenison Michael R. | Option exercise (derivative) | 1,557 | $0.00 | 4,674 |
| 2026-05-12 | Kenison Michael R. | Option exercise (derivative) | 1,928 | $0.00 | 1,928 |
| 2026-05-12 | Kenison Michael R. | Open-market sale | 6,643 | $70.30 | 18,683 |
| 2026-05-12 | Kenison Michael R. | Open-market sale | 3,576 | $69.78 | 25,326 |
| 2026-05-12 | Kenison Michael R. | Open-market sale | 4,198 | $68.70 | 28,902 |
| 2026-05-12 | Kenison Michael R. | Open-market sale | 1,613 | $67.58 | 33,100 |
| 2026-05-12 | Kenison Michael R. | Option exercise | 4,042 | $59.40 | 34,713 |
| 2026-05-12 | Kenison Michael R. | Option exercise | 1,557 | $39.61 | 30,671 |
| 2026-05-12 | Kenison Michael R. | Option exercise | 1,928 | $33.84 | 29,114 |
| 2026-05-11 | Kenison Michael R. | Option exercise (derivative) | 3,677 | $0.00 | 3,778 |
| 2026-05-11 | Kenison Michael R. | Option exercise (derivative) | 3,756 | $0.00 | 3,856 |
| 2026-05-11 | Kenison Michael R. | Open-market sale | 7,433 | $70.26 | 27,186 |
| 2026-05-11 | Kenison Michael R. | Option exercise | 3,677 | $33.52 | 34,619 |
| 2026-05-11 | Kenison Michael R. | Option exercise | 3,756 | $33.84 | 30,942 |
| 2026-05-07 | Kenison Michael R. | Option exercise (derivative) | 100 | $0.00 | 7,455 |
| 2026-05-07 | Kenison Michael R. | Option exercise (derivative) | 100 | $0.00 | 7,612 |
| 2026-05-07 | Kenison Michael R. | Open-market sale | 200 | $70.00 | 27,186 |
| 2026-05-07 | Kenison Michael R. | Option exercise | 100 | $33.52 | 27,386 |
| 2026-05-07 | Kenison Michael R. | Option exercise | 100 | $33.84 | 27,286 |
| 2026-02-25 | Kermisch Marc | Grant / award (derivative) | 5,095 | $0.00 | 5,095 |
| 2026-02-25 | Kermisch Marc | Grant / award | 2,795 | $0.00 | 6,513 |
| 2026-02-25 | Kenison Michael R. | Grant / award (derivative) | 4,404 | $0.00 | 4,404 |
| 2026-02-25 | Kenison Michael R. | Tax withholding | 531 | $62.63 | 27,186 |
| 2026-02-25 | Kenison Michael R. | Grant / award | 2,415 | $0.00 | 27,717 |
Source: SEC EDGAR Form 4 filings. For informational purposes only — not investment advice.