Harvard Bioscience, Inc. (HBIO) Ownership
HBIO ownership summary
as of October 18, 2026- Institutions
- 41.9% of shares outstanding
- Insiders
- 9.40% of shares outstanding
- Shares outstanding
- 4.6M
- Float
- 3.7M shares available to trade
- Short interest
- 1.00% 45K shares short
- Days to cover
- 2.41 short interest down 6.5% vs prior month
- Institutions 41.91%
- Insiders 9.40%
- Other investors 48.70%
HBIO top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Weber Capital Management LLC | 6.83% | 311K | $2.5M | −9,176 (−2.9%) | June 30, 2026 |
| 2 | Meros Investment Management, LP | 4.02% | 183K | $1.5M | +64,470 (+54.4%) | June 30, 2026 |
| 3 | Acadian Asset Management LLC | 3.95% | 180K | $1.5M | — | June 30, 2026 |
| 4 | Vanguard Capital Management, LLC | 3.73% | 170K | $1.4M | +6,312 (+3.9%) | June 30, 2026 |
| 5 | NANO CAP NEW MILLENNIUM GROWTH FUND L P | 3.14% | 143K | $1.2M | +25,582 (+21.8%) | June 30, 2026 |
| 6 | Corsair Capital Management LLC | 2.70% | 123K | $993,533 | −2,000 (−1.6%) | June 30, 2026 |
| 7 | Two Sigma Investments LLC | 2.52% | 115K | $926,669 | +428 (+0.4%) | June 30, 2026 |
| 8 | Renaissance Technologies Corp | 2.18% | 99K | $803,555 | −2,100 (−2.1%) | June 30, 2026 |
| 9 | BlackRock Inc | 1.36% | 62K | $500,237 | −392 (−0.6%) | June 30, 2026 |
| 10 | Geode Capital Management, LLC | 1.04% | 48K | $384,720 | −11,956 (−20.1%) | June 30, 2026 |
| 11 | Mink Brook Asset Management LLC | 0.73% | 33K | $269,955 | +33,369 (0.0%) | June 30, 2026 |
| 12 | Millennium Management LLC | 0.72% | 33K | $263,896 | −13,712 (−29.6%) | June 30, 2026 |
| 13 | Vanguard Fiduciary Trust Co | 0.61% | 28K | $224,336 | — | June 30, 2026 |
| 14 | Essex Investment Management Company, LLC | 0.59% | 27K | $218,212 | −48 (−0.2%) | June 30, 2026 |
| 15 | Williams & Novak LLC | 0.46% | 21K | $169,477 | −6,103 (−22.6%) | June 30, 2026 |
| 16 | UBS Group AG | 0.39% | 18K | $142,230 | +9,176 (+109.2%) | June 30, 2026 |
| 17 | RBF LLC | 0.35% | 16K | $129,440 | — | June 30, 2026 |
| 18 | State Street Corp | 0.33% | 15K | $120,800 | — | June 30, 2026 |
| 19 | Jane Street Group LLC | 0.31% | 14K | $113,114 | −9,848 (−41.3%) | June 30, 2026 |
| 20 | Citadel Advisors Llc | 0.29% | 13K | $107,201 | +13,251 (0.0%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 7 holders added 153K shares and 9 cut 55K.
HBIO top mutual fund and ETF holders
17 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Vanguard MStar Total Stk Mkt Idx Invest | 2.71% | 123K | $998,872 | — | August 31, 2026 |
| 2 | Fidelity Extended Market Index | 0.49% | 22K | $180,189 | −120 (−0.5%) | August 31, 2026 |
| 3 | Acuitas US Microcap Institutional | 0.29% | 13K | $108,244 | +4,597 (+52.3%) | June 30, 2026 |
| 4 | Fidelity Total Market Index | 0.15% | 7,017 | $56,768 | — | August 31, 2026 |
| 5 | Fidelity Series Total Market Index | 0.13% | 5,946 | $48,103 | — | August 31, 2026 |
| 6 | Vanguard Balanced Index Inv | 0.09% | 4,112 | $33,266 | — | August 31, 2026 |
| 7 | Gabelli Global Mini Mites I | 0.09% | 4,000 | $32,360 | — | June 30, 2026 |
| 8 | Dimensional US Sustainability Core 1 ETF | 0.04% | 1,902 | $15,387 | — | September 30, 2026 |
| 9 | DFA US Core Equity Class F | 0.04% | 1,720 | $13,915 | +1,720 (0.0%) | July 31, 2026 |
| 10 | Fidelity Nasdaq Composite Index | 0.04% | 1,699 | $13,745 | — | August 31, 2026 |
| 11 | DFA US Vector Equity Class F | 0.04% | 1,696 | $13,721 | +1,696 (0.0%) | July 31, 2026 |
| 12 | Dimensional US Small Cap ETF | 0.03% | 1,366 | $11,051 | — | September 30, 2026 |
| 13 | DFA US Vector Equity I | 0.03% | 1,229 | $9,943 | — | August 31, 2026 |
| 14 | Vanguard U.S. Eq Idx £ Acc | 0.03% | 1,221 | $9,878 | — | August 31, 2026 |
| 15 | Dimensional US Core Equity 2 ETF | 0.02% | 1,029 | $8,325 | — | September 30, 2026 |
| 16 | Dimensional US Core Equity 1 ETF | 0.02% | 928 | $7,508 | — | September 24, 2026 |
| 17 | LVIP Dimensional US Core Equity 2 Std | 0.01% | 601 | $4,862 | +601 (0.0%) | June 30, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
HBIO insider transactions
latest 4| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2026-03-17 | Stephen J Denelsky | Buy | $4.87 | 10,000 | $48,700 |
| 2026-03-17 | William Snider | Buy | $4.85 | 8,475 | $41,104 |
| 2026-03-16 | John D Duke | Buy | $5.01 | 5,000 | $25,050 |
| 2026-03-16 | William Snider | Buy | $4.99 | 12,525 | $62,500 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
HBIO shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns HBIO
Institutional investors own 41.9% of Harvard Bioscience's shares and insiders 9.40%. The largest holder is Weber Capital Management LLC with 6.83% of the shares (311K), as of June 30, 2026. Among the top 20 institutions, 7 added shares and 9 reduced their stake in the latest filings. Short interest is 1.00% of the float, or 2.41 days of average trading volume. The share count rose 36.8% since 2014.
Related: HBIO analyst forecast, HBIO key metrics. See the HBIO stock overview for the latest quote and news.
HBIO ownership FAQ
Who owns the most Harvard Bioscience stock?
The largest shareholders of Harvard Bioscience are Weber Capital Management LLC (6.83%), Meros Investment Management, LP (4.02%), Acadian Asset Management LLC (3.95%), Vanguard Capital Management, LLC (3.73%), NANO CAP NEW MILLENNIUM GROWTH FUND L P (3.14%).
What percentage of Harvard Bioscience is owned by institutions?
Institutions hold 41.9% of Harvard Bioscience's shares outstanding; insiders hold 9.40%.
Which funds own Harvard Bioscience?
The largest fund holders of Harvard Bioscience are Vanguard MStar Total Stk Mkt Idx Invest (2.71%), Fidelity Extended Market Index (0.49%), Acuitas US Microcap Institutional (0.29%), Fidelity Total Market Index (0.15%), Fidelity Series Total Market Index (0.13%).
What is Harvard Bioscience's short interest?
45K shares of Harvard Bioscience were sold short, 1.00% of the float; at the average daily volume it would take 2.41 days to cover.
Are insiders buying or selling Harvard Bioscience?
Of the latest 4 reported insider transactions in Harvard Bioscience (since March 16, 2026), 4 were purchases and 0 were sales.
How many shares of Harvard Bioscience are outstanding?
Harvard Bioscience has 4.6M shares outstanding, of which 3.7M are in the public float.