John D Duke insider trades: Harvard Bioscience (HBIO) stock purchases
Trades on the price chart
Daily close, with an arrow on each day they bought or sold
Companies
Where John reports to the SEC
Open-market buys and sales
1 trade reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| Mar 16, 2026 | HBIO | ↑ Buy | 5,000 | $5.01 | $25K | Direct | Mar 17, 2026 (1d) |
Each row is one filing's trades in one stock, summed. Shares and prices are as filed, before any later stock split.
Other HBIO insiders
Open-market trades in the last 12 months
About John D Duke's insider trades
John D Duke is Chief Executive Officer at Harvard Bioscience (HBIO). Since Mar 16, 2026, John has reported 1 open-market purchase worth $25K and no sales on SEC Form 4. In the last 12 months: 1 buy ($25K).
Their filings also include grants and awards (2 filings). These aren't open-market trades and aren't counted above.
How to read insider trades
Officers, directors and owners of more than 10% of a company must report trades in its stock on SEC Form 4, usually within two business days. Purchases with their own money are the stronger signal: insiders sell for many reasons (taxes, diversification, a house), but buy for one. See every HBIO insider trade, the latest insider trades across the market, or cluster buys, when several insiders buy the same stock within days.