Summary
Updated Aug 31, 2026
Donald G. Krantz is Director of Proto Labs Inc (PRLB). 2 SEC Form 4 filings on record going back to 2025, most recently on 21 May 2026.
Recent Transactions
2Every recent SEC Form 4 transaction Donald G. Krantz has reported, most recent first.
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 of PRLB open-market activity in the last 12 months
- Sven Wehrwein - $155K of PRLB open-market activity in the last 12 months
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
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.
Where can I see all of Donald G. Krantz's SEC filings?
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
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