Harvard Bioscience's three largest insider shareholders as of March 23, 2026 are James W Green (Director, 2.45Mn shares), John D Duke (Chief Executive Officer, 1.00Mn shares), Katherine A. Eade (Director, 421.13K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Thomas W Loewald | 295,311 | 0 | 23 May, 2024 | |
| Michael A. Rossi | Chief Financial Officer | 260,540 | 0 | 03 Jan, 2023 |
| John D Duke | Chief Executive Officer | 180,000 | 0 | 23 Mar, 2026 |
| Kenneth Fletcher Olson | Chief Operating Officer | 155,595 | 0 | 30 Dec, 2021 |
| Bertrand Loy | 56,575 | 0 | 23 May, 2024 | |
| William Snider | 32,000 | 0 | 18 Mar, 2026 | |
| Stephen J Denelsky | 21,000 | 0 | 18 Mar, 2026 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 20 Mar, 2026 | John D Duke | Common Stock | A | 75,000 | $0.00 | 180,000 | D | A |
| 17 Mar, 2026 | Stephen J Denelsky | Common Stock | A | 10,000 | $4.87 | 21,000 | D | P |
| 16 Mar, 2026 | William Snider | Common Stock | A | 12,525 | $4.99 | 23,525 | D | P |
| 17 Mar, 2026 | William Snider | Common Stock | A | 8,475 | $4.85 | 32,000 | D | P |
| 16 Mar, 2026 | John D Duke | Common Stock | A | 5,000 | $5.01 | 105,000 | D | P |
| 17 Dec, 2025 | William Snider | Common Stock | A | 110,000 | $0.00 | 110,000 | D | A |
| 05 Sep, 2025 | Stephen J Denelsky | Common Stock | A | 110,000 | $0.00 | 110,000 | D | A |
| 08 Aug, 2025 | John D Duke | Common Stock | A | 500,000 | $0.00 | 500,000 | D | A |
| 08 Aug, 2025 | John D Duke | Common Stock | A | 500,000 | $0.00 | 1,000,000 | D | A |
| 21 May, 2024 | Thomas W Loewald | Common Stock | A | 45,872 | $0.00 | 295,311 | D | A |
| 21 May, 2024 | Bertrand Loy | Common Stock | A | 56,575 | $0.00 | 56,575 | D | A |
| 22 May, 2023 | Thomas W Loewald | Common Stock | A | 25,554 | $0.00 | 249,439 | D | A |
| 22 May, 2023 | Bertrand Loy | Common Stock | A | 31,516 | $0.00 | 79,009 | D | A |
| 29 Dec, 2022 | Michael A. Rossi | Common Stock | D | 3,162 | $2.55 | 267,338 | D | F |
| 29 Dec, 2022 | Michael A. Rossi | Common Stock | D | 3,763 | $2.55 | 263,575 | D | F |
| 29 Dec, 2022 | Michael A. Rossi | Common Stock | D | 3,035 | $2.55 | 260,540 | D | F |
| 06 Sep, 2022 | Bertrand Loy | Common Stock | D | 108,715 | $0.00 | 0 | I | J |
| 26 Aug, 2022 | Bertrand Loy | Common Stock | A | 9,291 | $3.41 | 399,651 | D | P |
| 24 Aug, 2022 | Bertrand Loy | Common Stock | A | 17,291 | $3.23 | 382,116 | D | P |
| 25 Aug, 2022 | Bertrand Loy | Common Stock | A | 8,244 | $3.34 | 390,360 | D | P |