Harvard Bioscience Inc (HBIO) Insider Ownership

Historic Insider Ownership Trends

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).

Top Direct Holders

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

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
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