Quick Takeaways
- HBIO - HARVARD BIOSCIENCE INC has 14 insiders with reported activity on this page.
- No net insider buy/sell flow is currently reported for the last year.
- Recent transaction rows are available for direct filing-level review.
Insider Transactions Reported by 14 Insiders of HARVARD BIOSCIENCE INC
- Symbol
- HBIO on Nasdaq
- Location
- Holliston, MA
What Changed
- No meaningful buy/sell imbalance is currently visible in the one-year window.
- Activity will update as new Forms 3/4/5 are filed.
Why This Matters
- This page gives a plain-language issuer insider context before you inspect transaction-level evidence.
- Use the filing links below to verify timestamps, codes, and ownership impacts directly from SEC forms.
Source Evidence
Filed on Form 4
See Original Filing
Issuer insider activity is sourced from SEC Forms 3, 4, and 5.
Insider trading overview
Last 12 monthsInsider buy and sell flow is broadly balanced over the last 12 months. No Buy or Sell transactions have been reported since 11 May 2025.
Buys
$0
Shares: 0
Insiders: 0
Sells
$0
Shares: 0
Insiders: 0
Net
$0
Shares: 0
Insiders: 0
| Window (months) | Buy shares | Sell shares | Buy $ | Sell $ | Net $ |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
HARVARD BIOSCIENCE INC executives and other stock owners filed with the SEC include:
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Bertrand Loy | Director | $2,286,015 | Mixed | 21 May 2024 | ||
| Michael A. Rossi | Chief Financial Officer | $1,393,889 | Mixed | 29 Dec 2022 | ||
| James W. Green | Director | $1,226,283 | Mixed | 15 Aug 2025 | ||
| Thomas W. Loewald | Director | $1,213,728 | Mixed | 21 May 2024 | ||
| Alan I. Edrick | Director | $1,125,774 | Mixed | 21 May 2024 | ||
| Kenneth Fletcher Olson | Chief Operating Officer | $832,433 | Mixed | 29 Dec 2021 | ||
| Katherine A. Eade | Director | $186,895 | Mixed | 16 Jul 2025 | ||
| Jennifer Cote | Chief Financial Officer | $109,500 | Mixed | 19 Mar 2025 | ||
| John D. Duke | Chief Executive Officer, Director | $108,000 | Market | 20 Mar 2026 | ||
| Seth Benjamin Benson | Director | $48,818 | Mixed | 16 Jul 2025 | ||
| Robert E. Gagnon | Director | $48,818 | Mixed | 16 Jul 2025 | ||
| Frost Mark T. | Chief Financial Officer | $31,768 | Mixed | 20 Mar 2026 | ||
| William Snider | Director | $19,200 | Market | 16 Mar 2026 | ||
| Stephen J. Denelsky | Director | $12,600 | Market | 17 Mar 2026 |
Top shareholders of HARVARD BIOSCIENCE INC (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Ownership % is shown only when it is directly reported or safely comparable across share classes.
Methodology: rows are grouped by holder and ranked by the holder's primary source value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
| Holder | Source | Role / Reporting | Ownership % | Shares | Holdings Value | 12M Net Δ | As of | Details |
|---|---|---|---|---|---|---|---|---|
| Bertrand Loy |
3/4/5
|
Director |
—
class O/S missing
|
556,208
|
$2,286,015 | — | 21 May 2024 | |
| WEBER CAPITAL MANAGEMENT LLC /ADV |
13F
13D/G
|
Company · Weber Capital Management, LLC |
7.3%
from 13D/G
|
3,200,380
|
$2,140,413 | — | 31 Dec 2025 | |
| Leviticus Partners LP |
13D/G
|
— |
7.6%
|
3,401,601
|
$2,006,945 | +$30,445 | 31 Dec 2025 | |
| Michael A. Rossi |
3/4/5
|
Chief Financial Officer |
—
class O/S missing
|
260,540
|
$1,393,889 | — | 29 Dec 2022 | |
| VANGUARD GROUP INC |
13F
|
Company |
36%
|
1,923,275
|
$1,286,671 | — | 31 Dec 2025 | |
| James W. Green |
3/4/5
|
Director |
46%
|
2,452,566
|
$1,226,283 | — | 15 Aug 2025 | |
| Thomas W. Loewald |
3/4/5
|
Director |
—
class O/S missing
|
295,311
|
$1,213,728 | — | 21 May 2024 | |
| ACADIAN ASSET MANAGEMENT LLC |
13F
|
Company |
33%
|
1,772,627
|
$1,184,000 | — | 31 Dec 2025 | |
| Alan I. Edrick |
3/4/5
|
Director |
—
class O/S missing
|
273,911
|
$1,125,774 | — | 21 May 2024 | |
| Kenneth Fletcher Olson |
3/4/5
|
Chief Operating Officer |
—
class O/S missing
|
155,595
|
$832,433 | — | 29 Dec 2021 | |
| Harvey Partners, LLC |
13D/G
|
— |
5%
|
2,187,500
|
$831,250 | $0 | 31 Mar 2025 | |
| Meros Investment Management, LP |
13F
|
Company |
23%
|
1,217,628
|
$814,365 | — | 31 Dec 2025 | |
| CORSAIR CAPITAL MANAGEMENT, L.P. |
13F
|
Company |
21%
|
1,108,692
|
$741,493 | — | 31 Dec 2025 | |
| RENAISSANCE TECHNOLOGIES LLC |
13F
|
Company |
19%
|
1,021,241
|
$683,006 | — | 31 Dec 2025 | |
| TWO SIGMA INVESTMENTS, LP |
13F
|
Company |
19%
|
1,012,417
|
$677,104 | — | 31 Dec 2025 | |
| TWO SIGMA ADVISERS, LP |
13F
|
Company |
17%
|
878,556
|
$587,578 | — | 31 Dec 2025 | |
| William Snider |
13D/G
3/4/5
|
Director |
16%
|
846,000
|
$507,600 | $0 | 17 Dec 2025 | |
| BlackRock, Inc. |
13D/G
13F
|
Company |
2.5%
|
1,113,926
|
$494,360 | $0 | 30 Jun 2025 | |
| NANO CAP NEW MILLENNIUM GROWTH FUND L P |
13F
|
Company |
11%
|
600,000
|
$401,280 | — | 31 Dec 2025 | |
| MILLENNIUM MANAGEMENT LLC |
13F
|
Company |
10%
|
546,067
|
$365,210 | — | 31 Dec 2025 | |
| GEODE CAPITAL MANAGEMENT, LLC |
13F
|
Company |
8.7%
|
460,793
|
$308,248 | — | 31 Dec 2025 | |
| JANE STREET GROUP, LLC |
13F
|
Company |
7.8%
|
415,159
|
$277,658 | — | 31 Dec 2025 | |
| Portolan Capital Management, LLC |
13F
|
Company |
7.7%
|
409,650
|
$273,974 | — | 31 Dec 2025 | |
| Williams & Novak, LLC |
13F
|
Company |
6.6%
|
348,800
|
$233,277 | — | 31 Dec 2025 | |
| Katherine A. Eade |
3/4/5
|
Director |
7.9%
|
421,126
|
$186,895 | — | 16 Jul 2025 | |
| CITIGROUP INC |
13F
|
Company |
3.7%
|
193,828
|
$129,632 | — | 31 Dec 2025 | |
| ESSEX INVESTMENT MANAGEMENT CO LLC |
13F
|
Company |
3.5%
|
184,678
|
$123,513 | — | 31 Dec 2025 | |
| Jennifer Cote |
3/4/5
|
Chief Financial Officer |
—
class O/S missing
|
159,019
|
$109,500 | — | 19 Mar 2025 | |
| John D. Duke |
3/4/5
|
Chief Executive Officer, Director |
3.4%
|
180,000
|
$108,000 | — | 20 Mar 2026 | |
| RBF Capital, LLC |
13F
|
Company |
3%
|
160,000
|
$107,008 | — | 31 Dec 2025 | |
| STATE STREET CORP |
13F
|
Company |
2.8%
|
149,352
|
$99,887 | — | 31 Dec 2025 | |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP |
13F
|
Company |
2.6%
|
139,869
|
$93,544 | — | 31 Dec 2025 | |
| Assenagon Asset Management S.A. |
13F
|
Company |
2.6%
|
139,218
|
$93,109 | — | 31 Dec 2025 | |
| Bank of New York Mellon Corp |
13F
|
Company |
2.4%
|
126,223
|
$84,418 | — | 31 Dec 2025 | |
| NORTHERN TRUST CORP |
13F
|
Company |
1.7%
|
91,973
|
$61,512 | — | 31 Dec 2025 | |
| Robert E. Gagnon |
3/4/5
|
Director |
2.1%
|
110,000
|
$48,818 | — | 16 Jul 2025 | |
| Seth Benjamin Benson |
3/4/5
|
Director |
2.1%
|
110,000
|
$48,818 | — | 16 Jul 2025 | |
| Virtu Financial LLC |
13F
|
Company |
1.1%
|
59,508
|
$40,000 | — | 31 Dec 2025 | |
| GAMCO INVESTORS, INC. ET AL |
13F
|
Company |
1.1%
|
57,000
|
$38,122 | — | 31 Dec 2025 | |
| GOLDMAN SACHS GROUP INC |
13F
|
Company |
0.94%
|
49,751
|
$33,273 | — | 31 Dec 2025 | |
| Frost Mark T. |
3/4/5
|
Chief Financial Officer |
0.9%
|
47,500
|
$31,768 | — | 20 Mar 2026 | |
| Pasadena Private Wealth, LLC |
13F
|
Company |
0.85%
|
45,000
|
$30,096 | — | 31 Dec 2025 | |
| Legato Capital Management LLC |
13F
|
Company |
0.82%
|
43,467
|
$29,071 | — | 31 Dec 2025 | |
| CITADEL ADVISORS LLC |
13F
|
Company |
0.81%
|
42,992
|
$28,753 | — | 31 Dec 2025 | |
| XTX Topco Ltd |
13F
|
Company |
0.74%
|
39,349
|
$26,317 | — | 31 Dec 2025 | |
| GABELLI FUNDS LLC |
13F
|
Company |
0.74%
|
39,000
|
$26,083 | — | 31 Dec 2025 | |
| FMR LLC |
13F
|
Company |
0.62%
|
32,899
|
$22,003 | — | 31 Dec 2025 | |
| Callan Family Office, LLC |
13F
|
Company |
0.56%
|
29,791
|
$19,924 | — | 31 Dec 2025 | |
| DIMENSIONAL FUND ADVISORS LP |
13F
|
Company |
0.52%
|
27,792
|
$18,587 | — | 31 Dec 2025 | |
| GREENWOOD CAPITAL ASSOCIATES LLC |
13F
|
Company |
0.52%
|
27,754
|
$18,562 | — | 31 Dec 2025 |
Recent Insider Transactions by Companies or Individuals for HARVARD BIOSCIENCE INC
Showing up to 300 most recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | Value $ | * Price $ | Shares | Shares Owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Frost Mark T. | HBIO | Common Stock | Award | 171.4% | 30,000 | 47,500 | 20 Mar 2026 | Direct | ||
| John D. Duke | HBIO | Common Stock | Award | 71.4% | 75,000 | 180,000 | 20 Mar 2026 | Direct | ||
| Stephen J. Denelsky | HBIO | Common Stock | Purchase | 90.9% | 10,000 | 21,000 | 17 Mar 2026 | Direct | ||
| William Snider | HBIO | Common Stock | Purchase | 36% | 8,475 | 32,000 | 17 Mar 2026 | Direct | ||
| Frost Mark T. | HBIO | Common Stock | Purchase | 40% | 5,000 | 17,500 | 16 Mar 2026 | Direct | ||
| William Snider | HBIO | Common Stock | Purchase | 113.9% | 12,525 | 23,525 | 16 Mar 2026 | Direct | ||
| John D. Duke | HBIO | Common Stock | Purchase | 5% | 5,000 | 105,000 | 16 Mar 2026 | Direct | ||
| William Snider | HBIO | Common Stock | Award | 110,000 | 110,000 | 17 Dec 2025 | Direct | |||
| Stephen J. Denelsky | HBIO | Common Stock | Award | 110,000 | 110,000 | 05 Sep 2025 | Direct | |||
| James W. Green | HBIO | Common Stock | Tax liability | -1.67% | -44,740 | 2,631,968 | 15 Aug 2025 | Direct | ||
| James W. Green | HBIO | Common Stock | Disposed to Issuer | -12.4% | -347,782 | 2,452,566 | 15 Aug 2025 | Direct | ||
| John D. Duke | HBIO | Common Stock | Award | 1,000,000 | 1,000,000 | 08 Aug 2025 | Direct | |||
| Seth Benjamin Benson | HBIO | Common Stock | Award | 110,000 | 110,000 | 16 Jul 2025 | Direct | |||
| Katherine A. Eade | HBIO | Common Stock | Award | 35.4% | 110,000 | 421,126 | 16 Jul 2025 | Direct | ||
| Robert E. Gagnon | HBIO | Common Stock | Award | 110,000 | 110,000 | 16 Jul 2025 | Direct | |||
| Frost Mark T. | HBIO | Common Stock | Award | 400% | 100,000 | 125,000 | 12 May 2025 | Direct |
* An asterisk sign (*) next to the price indicates that the price is likely invalid.