Based on data from the past 90 days ending February 07, 2026, Harvard Bioscience's three largest insider shareholders are Director James W Green (2.45Mn shares), Chief Executive Officer John D Duke (1.00Mn shares), Director Katherine A. Eade (421.13K shares).
| Holder | Position | Shares | Report Date |
|---|---|---|---|
| James W Green | 2,452,566 | 19 Aug, 2025 | |
| John D Duke | Chief Executive Officer | 1,000,000 | 11 Aug, 2025 |
| Katherine A. Eade | 421,126 | 18 Jul, 2025 | |
| Thomas W Loewald | 295,311 | 23 May, 2024 | |
| Alan I Edrick | 273,911 | 23 May, 2024 | |
| Michael A. Rossi | Chief Financial Officer | 260,540 | 03 Jan, 2023 |
| Jennifer Cote | Chief Financial Officer | 159,019 | 21 Mar, 2025 |
| Kenneth Fletcher Olson | Chief Operating Officer | 155,595 | 30 Dec, 2021 |
| Mark T Frost | Interim Cfo | 125,000 | 14 May, 2025 |
| Seth Benjamin Benson | 110,000 | 25 Jul, 2025 | |
| Robert E. Gagnon | 110,000 | 18 Jul, 2025 | |
| Stephen J Denelsky | 110,000 | 07 Oct, 2025 | |
| William Snider | 110,000 | 30 Dec, 2025 | |
| Bertrand Loy | 56,575 | 23 May, 2024 |
* 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 |
|---|---|---|---|---|---|---|---|---|
| 17 Dec, 2025 | William Snider | Common Stock | A | 110,000 | $0.00 | 110,000 | D | A |
| 05 Sep, 2025 | Stephen J Denelsky | - | - | 110,000 | D | |||
| 05 Sep, 2025 | Stephen J Denelsky | Common Stock | A | 110,000 | $0.00 | 110,000 | D | A |
| 15 Aug, 2025 | James W Green | Common Stock | D | 66,036 | $0.00 | 2,565,905 | D | D |
| 15 Aug, 2025 | James W Green | Common Stock | D | 33,200 | $0.53 | 2,762,840 | D | F |
| 15 Aug, 2025 | James W Green | - | - | 2,631,968 | D | |||
| 15 Aug, 2025 | James W Green | - | - | 2,452,566 | D | |||
| 15 Aug, 2025 | James W Green | Common Stock | D | 113,366 | $0.00 | 2,452,566 | D | D |
| 15 Aug, 2025 | James W Green | - | - | 2,565,905 | D | |||
| 15 Aug, 2025 | James W Green | Common Stock | D | 49,048 | $0.00 | 2,796,040 | D | D |
| 15 Aug, 2025 | James W Green | Common Stock | D | 11,540 | $0.53 | 2,631,968 | D | F |
| 15 Aug, 2025 | James W Green | - | - | 2,762,840 | D | |||
| 15 Aug, 2025 | James W Green | Common Stock | D | 119,332 | $0.00 | 2,643,508 | D | D |
| 15 Aug, 2025 | James W Green | - | - | 2,643,508 | D | |||
| 15 Aug, 2025 | James W Green | - | - | 2,796,040 | D | |||
| 08 Aug, 2025 | John D Duke | Common Stock | A | 500,000 | $0.00 | 1,000,000 | D | A |
| 08 Aug, 2025 | John D Duke | - | - | 500,000 | D | |||
| 08 Aug, 2025 | John D Duke | - | - | 1,000,000 | D | |||
| 08 Aug, 2025 | John D Duke | Common Stock | A | 500,000 | $0.00 | 500,000 | D | A |
| 16 Jul, 2025 | Robert E. Gagnon | Common Stock | A | 110,000 | $0.00 | 110,000 | D | A |