Duke John D (CIK 2071593) reported 4 SEC Form 4 insider transactions across 1 companies over the past 18 months (most recent 2026-03-23). Recent activity: Buy HBIO (75,000 shares), Buy HBIO (5,000 shares), Buy HBIO (500,000 shares), Buy HBIO (500,000 shares). Source: SEC Form 4.
| Date | Company | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-03-23 | HARVARD BIOSCIENCE INC (HBIO) | Chief Executive Officer | Buy | 75,000 | $0 |
| 2026-03-17 | HARVARD BIOSCIENCE INC (HBIO) | Chief Executive Officer | Buy | 5,000 | $25,050 |
| 2025-08-11 | HARVARD BIOSCIENCE INC (HBIO) | Chief Executive Officer | Buy | 500,000 | $0 |
| 2025-08-11 | HARVARD BIOSCIENCE INC (HBIO) | Chief Executive Officer | Buy | 500,000 | $0 |
Source: SEC Form 4 filings · as of 2026-03-23