Comparable stake leader
William Snider
SEC ownership of HARVARD BIOSCIENCE INC
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001123494.
Disclosed value leader
Bertrand Loy
Comparable rows
11/50
Latest evidence
09 Jun 2026
- Public ticker
- HBIO on Nasdaq
- Parsed ownership sources
-
13D/G, 3/4/5, and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
William Snider
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
11 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
William Snider
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
09 Jun 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001123494
- Issuer location
- Holliston, MA
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of HARVARD BIOSCIENCE INC (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
William Snider
Disclosed value leader
Bertrand Loy
Comparable rows
11/50
Latest evidence
09 Jun 2026
13D/G
3/4/5
13F
Lead comparable stake: 16%
39 rows are not safely comparable across share classes.
13D/G row: William Snider
Showing 1-8 of 50 holder rows.
Quick read
William Snider leads the comparable SEC ownership view at 16%.
11 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens William Snider's linked filing trail.
Comparable ownership
Top 5
William Snider
16%
Leviticus Partners LP
7.6%
WEBER CAPITAL MANAGEMENT LLC /ADV
7.3%
Harvey Partners, LLC
5%
BlackRock, Inc.
2.5%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| William Snider |
13D/G
3/4/5
Director
|
16%
|
$507,600
846,000 shares
|
$0 | 17 Dec 2025 |
| Leviticus Partners LP |
13D/G
|
7.6%
|
$2,006,945
3,401,601 shares
|
+$30,445 | 31 Dec 2025 |
| WEBER CAPITAL MANAGEMENT LLC /ADV |
13F
13D/G
Company · Weber Capital Management, LLC
|
7.3%
from 13D/G
|
$1,558,580
320,037 shares
|
— | 31 Mar 2026 |
| Harvey Partners, LLC |
13D/G
|
5%
|
$831,250
2,187,500 shares
|
$0 | 31 Mar 2025 |
| BlackRock, Inc. |
13D/G
13F
Company
|
2.5%
|
$494,360
1,113,926 shares
|
$0 | 30 Jun 2025 |
| PUNCH & ASSOCIATES INVESTMENT MANAGEMENT, INC. |
13D/G
|
0.1%
|
$9,723
25,586 shares
|
$0 | 31 Mar 2025 |
| James W. Green |
3/4/5
Director
|
54%
|
$1,226,283
2,452,566 shares
|
— | 15 Aug 2025 |
| John D. Duke |
3/4/5
Chief Executive Officer, Director
|
4%
|
$108,000
180,000 shares
|
— | 20 Mar 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Insider buy and sell flow is broadly balanced over the last 12 months. No Buy or Sell transactions have been reported since 20 Jun 2025.
Buys
$0
Insiders: 0
Sells
$0
Insiders: 0
Net
$0
Shares: 0
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 0
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 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 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-14 of 14 reporting-owner rows connected to HARVARD BIOSCIENCE INC. Open a relationship link for the CIK-to-CIK filing trail.
Rows
14
Largest Forms 3/4/5 holder
Bertrand Loy
Net 12M change
$0
Latest report
09 Jun 2026
| 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 | $285,718 | Median | 09 Jun 2026 | ||
| William Snider | Director | $236,467 | Median | 09 Jun 2026 | ||
| Stephen J. Denelsky | Director | $182,897 | Median | 09 Jun 2026 | ||
| Robert E. Gagnon | Director | $134,197 | Median | 09 Jun 2026 | ||
| Seth Benjamin Benson | Director | $134,197 | Median | 09 Jun 2026 | ||
| Jennifer Cote | Chief Financial Officer | $109,500 | Mixed | 19 Mar 2025 | ||
| John D. Duke | Chief Executive Officer, Director | $108,000 | Market | 20 Mar 2026 | ||
| Frost Mark T. | Chief Financial Officer | $31,768 | Mixed | 20 Mar 2026 |
Recent insider transactions for HARVARD BIOSCIENCE INC
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Katherine A. Eade | HBIO | Common Stock | Award | 39.3% | 16,556 | 58,669 | 09 Jun 2026 | Direct | ||
| William Snider | HBIO | Common Stock | Award | 51.7% | 16,556 | 48,556 | 09 Jun 2026 | Direct | ||
| Stephen J. Denelsky | HBIO | Common Stock | Award | 78.8% | 16,556 | 37,556 | 09 Jun 2026 | Direct | ||
| Robert E. Gagnon | HBIO | Common Stock | Award | 150.5% | 16,556 | 27,556 | 09 Jun 2026 | Direct | ||
| Seth Benjamin Benson | HBIO | Common Stock | Award | 150.5% | 16,556 | 27,556 | 09 Jun 2026 | Direct | ||
| 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 |
* marks a reported price that did not pass the local price check.