Harvard Bioscience Inc (HBIO) Insider Ownership

Historic Insider Ownership Trends

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).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
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.

Recent Insider Transactions

Detailed insider trading activity based on Form 4 SEC filings.
Download Data
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