As of the latest Form 4 filed Jun 4, 2026.
What Proto Labs Inc insiders — officers, directors and 10% owners — have bought and sold in their own stock, straight from their SEC Form 4 filings. Values are shares × the reported transaction price where both are disclosed.
Buys plotted up, sells down; bar height is the disclosed dollar value (shares × reported price). Our Form 4 history is only complete from mid-2026, so early months are sparse — the series fills in as more filings land. Open-market purchases and sales only.
Newest filing first — the 17 most recent filings for PRLB.
| Filed | Trade date | Insider | Transaction | Shares | Price | Value | 10b5-1 | Filing |
|---|---|---|---|---|---|---|---|---|
| 2026-06-04 | 2026-06-02 | WEHRWEIN SVEN Director | SSale | −500.00 | $78.38 | $39.2K | No | Form 4 ↗ |
| 2026-06-04 | 2026-06-02 | WEHRWEIN SVEN, Director | SSale | −1.50K | $76.91 | $115K | No | Form 4 ↗ |
| 2026-05-27 | 2026-05-23 | Krishna Suresh President and CEO | FTax | −1.25K | $71.36 | $89.0K | No | Form 4 ↗ |
| 2026-05-13 | 2026-05-12 | Kenison Michael R. Chief Operations Officer | SSale | −6.64K | $70.30 | $467K | Yes (planned) | Form 4 ↗ |
| 2026-05-13 | 2026-05-12 | Kenison Michael R., Chief Operations Officer | SSale | −3.58K | $69.78 | $250K | Yes (planned) | Form 4 ↗ |
| 2026-05-13 | 2026-05-12 | Kenison Michael R., Chief Operations Officer | SSale | −4.20K | $68.70 | $288K | Yes (planned) | Form 4 ↗ |
| 2026-05-13 | 2026-05-12 | Kenison Michael R., Chief Operations Officer | SSale | −1.61K | $67.58 | $109K | Yes (planned) | Form 4 ↗ |
| 2026-05-13 | 2026-05-12 | Kenison Michael R., Chief Operations Officer | MExercise | +4.04K | $59.40 | $240K | Yes (planned) | Form 4 ↗ |
| 2026-05-13 | 2026-05-12 | Kenison Michael R., Chief Operations Officer | MExercise | +1.56K | $39.61 | $61.7K | Yes (planned) | Form 4 ↗ |
| 2026-05-13 | 2026-05-12 | Kenison Michael R., Chief Operations Officer | MExercise | +1.93K | $33.84 | $65.2K | Yes (planned) | Form 4 ↗ |
| 2026-05-13 | 2026-05-11 | Kenison Michael R., Chief Operations Officer | SSale | −7.43K | $70.26 | $522K | Yes (planned) | Form 4 ↗ |
| 2026-05-13 | 2026-05-11 | Kenison Michael R., Chief Operations Officer | MExercise | +3.68K | $33.52 | $123K | Yes (planned) | Form 4 ↗ |
| 2026-05-13 | 2026-05-11 | Kenison Michael R., Chief Operations Officer | MExercise | +3.76K | $33.84 | $127K | Yes (planned) | Form 4 ↗ |
| 2026-02-12 | 2026-02-11 | Schumacher Daniel Chief Financial Officer | MExercise | +3.13K | $33.84 | $106K | No | Form 4 ↗ |
| 2026-02-12 | 2026-02-10 | Schumacher Daniel, Chief Financial Officer | FTax | −6.81K | $53.18 | $362K | No | Form 4 ↗ |
| 2026-02-12 | 2026-02-10 | Kenison Michael R. Chief Operations Officer | FTax | −2.68K | $53.18 | $143K | No | Form 4 ↗ |
| 2026-02-09 | 2026-02-06 | Kenison Michael R. Chief Operations Officer | SSale | −2.50K | $60.00 | $150K | Yes (planned) | Form 4 ↗ |
Insiders — a company’s officers, directors and holders of more than 10% of its stock — must report any trade in that stock to the SEC on a Form 4 within two business days. Each row here is one transaction from those filings.
The transaction code tells you what happened: Purchase (P) and Sale (S) are open-market trades — the ones markets watch most; Award (A) is a granted stock or unit, Option exercise (M) converts options into shares, and Gift (G) is a transfer for no consideration. Awards, exercises and gifts are largely compensation or administrative, not a directional bet.
One caveat on sales: many are made under a Rule 10b5-1 plan scheduled months in advance, so a sale is not automatically a bearish signal. Insider activity is a noisy input — read it alongside the filings, not on its own.
See also PRLB’s full analysis or the market-wide insider trading feed. The tabs above jump to PRLB’s other SEC data.
Source: SEC Form 4 filings for PRLB, parsed from EDGAR. Transaction prices are as reported in the filing — SEC public-domain data, not market quotes. Values are shares × reported price where both are disclosed; grants and gifts often carry no price. A delayed record of what insiders reported, not a live position or a recommendation.
Research and education only — not financial advice. TENKis not a registered investment adviser or broker-dealer and gives no personalized advice. Every call is impersonal — identical for all users, generated on a schedule from SEC filings plus a delayed/third-party price feed — may be wrong or out of date, and is not a recommendation to buy or sell any security. The operator and an affiliated trading operation may hold or trade the securities TENK rates; see Disclosures. Past performance does not guarantee future results. Do your own research.