John D. Duke
Chief Executive Officer, Director · HARVARD BIOSCIENCE INC
- 2025
- Mar 23, 2026
- 3
Other insiders active in the same stocks
Insiders who reported open-market trades in the last 12 months at the companies John D. Duke 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.
- William Snider - $104K in HBIO purchases and sales in the last 12 months
- Stephen J. Denelsky - $49K in HBIO purchases and sales in the last 12 months
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Frequently asked questions
Who is John D. Duke?
John D. Duke is a corporate insider, tracked as Chief Executive Officer, Director of HARVARD BIOSCIENCE INC (HBIO). InsiderAlpha holds 3 primary Form 4 filings for them, the earliest from 2025, updated as new SEC EDGAR filings are processed.
When did John D. Duke last file a Form 4?
The most recent primary Form 4 on record is dated 23 March 2026, one of 3 filings going back to 2025.
Has John D. Duke been buying or selling stock?
Recorded transactions: 1 open-market purchase ($25K) and 0 open-market sales across all tracked filings.
