Filings (90d)
Other insiders active in the same stocks
Insiders who reported open-market trades in the last 12 months at the companies Donald G. Krantz files at. Multiple unrelated insiders buying the same stock within a short window, cluster buying, has historically been one of the strongest Form 4 signals.
- Michael R. Kenison - $2.29M in PRLB purchases and sales in the last 12 months
- Daniel Schumacher - $903K in PRLB purchases and sales in the last 12 months
- Sven Wehrwein - $155K in PRLB purchases and sales in the last 12 months
More insiders (A-Z)
Browse nearby insider profiles in alphabetical order.
Frequently asked questions
Who is Donald G. Krantz?
Donald G. Krantz is a corporate insider, tracked as Director of Proto Labs Inc (PRLB). InsiderAlpha holds 2 primary Form 4 filings for them, the earliest from 2025, updated as new SEC EDGAR filings are processed.
When did Donald G. Krantz last file a Form 4?
The most recent primary Form 4 on record is dated 21 May 2026, one of 2 filings going back to 2025.
