Updated Jul 16, 2026 · Last SEC filing 2026-06-04
Proto Labs Inc (PRLB) has filed 12 SEC Form 4 insider transactions in the last 90 days, with the most recent on 2026-06-04. 3 Form 8-K material event filings were reported by PRLB in the last 90 days. 4 Form 144 notices of proposed sale were filed for PRLB stock. InsiderAlpha tracks every PRLB SEC filing — Form 4, Form 144, and 8-K — in real time, including Rule 10b5-1 plan detection.
| SEC CIK | 0001443669 |
|---|
| Form 4 filings (90d) | 12 |
|---|---|
| Form 8-K filings (90d) | 3 |
| Form 144 notices (90d) | 4 |
| Latest Form 4 filing | 2026-06-04 |
| Date | Insider | Role | Transaction | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| WEHRWEIN SVEN | Director | S — Open-market sale | 1.5K | $76.91 | $115K | SEC | |
| WEHRWEIN SVEN | Director | S — Open-market sale | 500 | $78.38 | $39K | SEC | |
| Krishna Suresh | President and CEO | F — Tax withholding / forfeiture | 1.2K | $71.36 | $89K | SEC | |
| Parlange Bernardo | Chief Commercial Officer | A — Grant or award | 2.1K | $0.00 | — | SEC | |
| Schumacher Daniel | Chief Financial Officer | F — Tax withholding / forfeiture | 255 | $71.13 | $18K | SEC | |
| Gawlick Rainer | Director | A — Grant or award | 2.2K | $0.00 | — | SEC | |
| Chand Sujeet | Director | A — Grant or award | 2.2K | $0.00 | — | SEC | |
| WEHRWEIN SVEN | Director | A — Grant or award | 2.2K | $0.00 | — | SEC | |
| KRANTZ DONALD G | Director | A — Grant or award | 2.2K | $0.00 | — | SEC | |
| Black Archie C. | Director | A — Grant or award | 2.2K | $0.00 | — | SEC | |
| Chin Moonhie | Director | A — Grant or award | 2.2K | $0.00 | — | SEC | |
| Kenison Michael R. | Chief Operations Officer | S — Open-market sale | 6.6K | $70.30 | $467K | SEC | |
| Kenison Michael R. | Chief Operations Officer | M — Option exercise | 1.9K | $33.84 | $65K | SEC | |
| Kenison Michael R. | Chief Operations Officer | S — Open-market sale | 1.6K | $67.58 | $109K | SEC | |
| Kenison Michael R. | Chief Operations Officer | S — Open-market sale | 4.2K | $68.70 | $288K | SEC |
All transactions sourced from SEC EDGAR Form 4 filings for Proto Labs Inc (PRLB). Updated in real time as new filings are submitted to the SEC.
| Insider | Form 4 filings | Total transaction value |
|---|---|---|
| Kenison Michael R. | 20 | $2.27M |
| WEHRWEIN SVEN | 3 | $155K |
| Parlange Bernardo | 2 | — |
| Gawlick Rainer | 1 | — |
| Black Archie C. | 1 | — |
Form 144 must be filed before insiders sell restricted or control stock above SEC thresholds. A cluster of Form 144 notices often precedes a wave of insider distribution.
SEC Form 4 transactions are reported with a one-letter code indicating the type of transaction. Common codes you'll see in PRLB insider filings:
| P | Open-market purchase by the insider |
|---|---|
| S | Open-market sale by the insider |
| A | Grant, award, or other acquisition from the issuer |
| M | Exercise or conversion of derivative security (e.g. options) |
| F | Payment of exercise price or tax liability via share withholding |
| G | Bona-fide gift of securities |
| D | Disposition to the issuer (e.g. share buyback participation) |
| J | Other acquisition or disposition |
| X | Exercise of in-the-money or at-the-money derivative security |
| C | Conversion of derivative security |
| V | Transaction voluntarily reported earlier than required |
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