Duke John D — Insider Stock Purchases
Chief Executive Officer. Every open-market stock purchase by Duke John D that we've tracked from SEC Form 4 filings, scored on our six-factor model. Not financial advice.
Tracked buys
1
Total value
$25,050
Most recent
Mar 16, 2026
| Ticker | Insider | Role | Value | Filed | Signal | Score |
|---|---|---|---|---|---|---|
| HBIO HARVARD BIOSCIENCE INC | Duke John D | Chief Executive Officer | $25,050 | Mar 17, 2026 | AVOID | 41 |
About this profile
This page collects open-market share purchases disclosed by Duke John D in SEC Form 4 filings. When an insider buys with personal money on the open market, it is the cleanest conviction signal available — far more informative than a sale.
Each purchase is scored with our six-factor methodology. To see how these signals performed against the S&P 500, view the track record, or browse all tracked insiders on the insiders directory.
Not financial advice. For educational purposes only. Form 4 data can be amended or filed late; analysis is generated using AI and may contain errors.