Proto Labs, Inc. (PRLB) ownership: Top institutional holder: BlackRock, Inc. ($209.71M). Insider activity: Net Seller (2 buys, 18 sells). SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| BlackRock, Inc. | 3677875.00 | $209.71M | 2026-03-31 |
| DISCIPLINED GROWTH INVESTORS INC /MN | 2497355.00 | $142.40M | 2026-03-31 |
| VANGUARD GROUP INC | 2666227.00 | $134.88M | 2025-12-31 |
| BlackRock Fund Advisors | 1880371.00 | $96.56M | 2016-12-31 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 1538530.00 | $87.73M | 2026-03-31 |
| DIMENSIONAL FUND ADVISORS LP | 1272356.00 | $72.55M | 2026-03-31 |
| STATE STREET CORP | 1092000.00 | $62.27M | 2026-03-31 |
| VANGUARD CAPITAL MANAGEMENT LLC | 1039741.00 | $59.29M | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Buy | null | 2026-05-23 | |
| Sell | null | 2026-05-20 | |
| Buy | null | 2026-05-20 | |
| Sell | null | 2026-05-20 | |
| Sell | null | 2026-05-19 | |
| Sell | null | 2026-05-19 | |
| Sell | null | 2026-05-19 | |
| Sell | null | 2026-05-19 |
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Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.