🕵️ Proto LABS Inc ($PRLB)
SEC insider & ownership activity, last 12 months · CIK 1443669 · every row links its SEC filing
Over the last 12 months insiders sold $2.4M with no open-market buying against it. Michael R. Kenison sold $2.3M through a 10b5-1 trading plan in 9 lots (Nov–May). 1 planned sale is pending, the largest $8K (Daniel Schumacher). No red-flag 8-Ks in the window.
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Monthly net open-market insider flow, last 12 months (up = net buying)
Insider flow
0 buyers, $0 (0 lots) · 2 sellers, $2.4M (11 lots)
| Insider | Buys | Bought | Sells | Sold | Last |
|---|---|---|---|---|---|
| Michael R. Kenison | 0 | – | 9 | $2.3M | May 12, 2026 |
| Wehrwein Sven | 0 | – | 2 | $155K | Jun 2, 2026 |
5%+ holders
| Holder | Stake | Class | Schedule | Event | |
|---|---|---|---|---|---|
| BlackRock, Inc. | 15.0% | 13G | Jul 17, 2025 | filing ↗ | |
| Disciplined Growth Investors Inc /MN | 10.0% | 13G | Aug 14, 2026 | filing ↗ | |
| Vanguard Portfolio Management | 6.5% | 13G | Apr 29, 2026 | filing ↗ | |
| Vanguard Capital Management | 5.1% | 13G | Apr 30, 2026 | filing ↗ |
Planned insider sales (Form 144)
| Seller | Planned | Approx. sale date | |
|---|---|---|---|
| Daniel Schumacher | $8K | Sep 16, 2026 | filing ↗ |
| Michael R. Kenison | $948K | Aug 4, 2026 | filing ↗ |
| Wehrwein Sven | $152K | Jun 1, 2026 | filing ↗ |
| Michael R. Kenison | $1.1M | May 12, 2026 | filing ↗ |
| Michael Kenison | $515K | May 11, 2026 | filing ↗ |
| Michael Kenison | $14K | May 7, 2026 | filing ↗ |
| Michael Kenison | $394K | Feb 6, 2026 | filing ↗ |
| Oleg Ryaboy | $20K | Jan 16, 2026 | filing ↗ |
| Oleg Ryaboy | $393K | Jan 15, 2026 | filing ↗ |
| Oleg Ryaboy | $384K | Jan 8, 2026 | filing ↗ |
| Oleg Ryaboy | $357K | Jan 7, 2026 | filing ↗ |
| Oleg Ryaboy | $35K | Nov 25, 2025 | filing ↗ |
| Michael Kenison | $150K | Nov 25, 2025 | filing ↗ |
| Oleg Ryaboy | $472K | Nov 7, 2025 | filing ↗ |
Material events (8-K)
| Item | Event date | |
|---|---|---|
| Reg FD disclosure (7.01) | Aug 24, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Aug 24, 2026 | filing ↗ |
| Earnings (2.02) | Jul 31, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jul 31, 2026 | filing ↗ |
| Officer/director changes (5.02) | May 19, 2026 | filing ↗ |
| Shareholder vote (5.07) | May 19, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 19, 2026 | filing ↗ |
| Officer/director changes (5.02) | May 6, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | May 6, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 6, 2026 | filing ↗ |
| Earnings (2.02) | May 1, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 1, 2026 | filing ↗ |
| Earnings (2.02) | Feb 6, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Feb 6, 2026 | filing ↗ |
| Earnings (2.02) | Feb 6, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Feb 6, 2026 | filing ↗ |
| Earnings (2.02) | Oct 31, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Oct 31, 2025 | filing ↗ |
| Officer/director changes (5.02) | Oct 3, 2025 | filing ↗ |
| Reg FD disclosure (7.01) | Oct 3, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Oct 3, 2025 | filing ↗ |