HARVARD BIOSCIENCE INC - HBIO
Detailed investor-level table based on 13F positions.
Methodology:
Market value and % of portfolio use SEC reported VALUE ($000).
For PUT/CALL positions this reflects reported underlying exposure, not premium cash paid/received.
Details.
Rows: 0
| Investor | History | Status | Shares held | Market value ($000) | % of portfolio | Previous % | Rank | Change in shares | % change in shares | Source | Date reported |
|---|---|---|---|---|---|---|---|---|---|---|---|
| WEBER CAPITAL MANAGEMENT LLC /ADV | History | Reduced | 320,037 | 1,558 | 1.56% | 2.02% | 1 | -2,880,343 | -90.0% | Q1 2026 | Apr 22, 2026 |
| VANGUARD GROUP INC | History | No change | 1,923,275 | 1,286 | 0.0% | 0.0% | 2 | 0 | 0.0% | Q4 2025 | Jan 29, 2026 |
| ACADIAN ASSET MANAGEMENT LLC | History | Reduced | 179,614 | 873 | 0.0% | 0.0% | 3 | -1,593,013 | -89.87% | Q1 2026 | May 13, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | History | New | 163,313 | 795 | 0.0% | — | 4 | +163,313 | New | Q1 2026 | May 15, 2026 |
| CORSAIR CAPITAL MANAGEMENT, L.P. | History | Reduced | 124,810 | 607 | 0.09% | 0.12% | 5 | -983,882 | -88.74% | Q1 2026 | May 15, 2026 |
| TWO SIGMA ADVISERS, LP | History | No change | 878,556 | 587 | 0.0% | 0.0% | 6 | 0 | 0.0% | Q4 2025 | Feb 17, 2026 |
| Meros Investment Management, LP | History | Reduced | 118,522 | 577 | 0.25% | 0.32% | 7 | -1,099,106 | -90.27% | Q1 2026 | May 14, 2026 |
| NANO CAP NEW MILLENNIUM GROWTH FUND L P | History | Reduced | 117,500 | 572 | 0.53% | 0.34% | 8 | -482,500 | -80.42% | Q1 2026 | May 15, 2026 |
| TWO SIGMA INVESTMENTS, LP | History | Reduced | 114,117 | 555 | 0.0% | 0.0% | 9 | -898,300 | -88.73% | Q1 2026 | May 15, 2026 |
| RENAISSANCE TECHNOLOGIES LLC | History | Reduced | 101,427 | 493 | 0.0% | 0.0% | 10 | -919,814 | -90.07% | Q1 2026 | May 14, 2026 |
| BlackRock, Inc. | History | Reduced | 62,226 | 303 | 0.0% | 0.0% | 11 | -560,070 | -90.0% | Q1 2026 | May 13, 2026 |
| GEODE CAPITAL MANAGEMENT, LLC | History | Reduced | 59,511 | 289 | 0.0% | 0.0% | 12 | -401,282 | -87.09% | Q1 2026 | May 15, 2026 |
| MILLENNIUM MANAGEMENT LLC | History | Reduced | 46,332 | 225 | 0.0% | 0.0% | 13 | -499,735 | -91.52% | Q1 2026 | May 15, 2026 |
| Williams & Novak, LLC | History | Reduced | 27,052 | 137 | 0.1% | 0.18% | 14 | -321,748 | -92.24% | Q1 2026 | Apr 20, 2026 |
| VANGUARD FIDUCIARY TRUST CO | History | New | 27,730 | 135 | 0.0% | — | 15 | +27,730 | New | Q1 2026 | May 08, 2026 |
| ESSEX INVESTMENT MANAGEMENT CO LLC | History | Reduced | 27,021 | 131 | 0.02% | 0.02% | 16 | -157,657 | -85.37% | Q1 2026 | May 11, 2026 |
| JANE STREET GROUP, LLC | History | Reduced | 23,830 | 116 | 0.0% | 0.0% | 17 | -421,129 | -94.64% | Q1 2026 | May 12, 2026 |
| RBF Capital, LLC | History | Reduced | 16,000 | 77 | 0.0% | 0.0% | 18 | -144,000 | -90.0% | Q1 2026 | May 18, 2026 |
| STATE STREET CORP | History | Reduced | 14,932 | 72 | 0.0% | 0.0% | 19 | -134,420 | -90.0% | Q1 2026 | May 15, 2026 |
| Bank of New York Mellon Corp | History | Reduced | 10,230 | 49 | 0.0% | 0.0% | 20 | -115,993 | -91.9% | Q1 2026 | May 05, 2026 |
| UBS Group AG | History | Reduced | 8,405 | 40 | 0.0% | 0.0% | 21 | -12,808 | -60.38% | Q1 2026 | May 05, 2026 |
| CITIGROUP INC | History | Reduced | 6,273 | 30 | 0.0% | 0.0% | 22 | -187,555 | -96.76% | Q1 2026 | May 11, 2026 |
| JPMORGAN CHASE & CO | History | Added to | 4,463 | 20 | 0.0% | 0.0% | 23 | +2,503 | 127.7% | Q1 2026 | May 13, 2026 |
| FMR LLC | History | Reduced | 3,274 | 15 | 0.0% | 0.0% | 24 | -29,625 | -90.05% | Q1 2026 | May 15, 2026 |
| GROUP ONE TRADING LLC | History | Reduced | 2,182 | 10 | 0.0% | 0.0% | 25 | -23,331 | -91.45% | Q1 2026 | May 13, 2026 |
| MORGAN STANLEY | History | Reduced | 1,628 | 7 | 0.0% | 0.0% | 26 | -15,058 | -90.24% | Q1 2026 | May 15, 2026 |
| Tower Research Capital LLC (TRC) | History | Reduced | 1,152 | 5 | 0.0% | 0.0% | 27 | -1,243 | -51.9% | Q1 2026 | May 15, 2026 |
| Vanguard Global Advisers, LLC | History | New | 1,221 | 5 | 0.0% | — | 28 | +1,221 | New | Q1 2026 | May 08, 2026 |
| SBI Securities Co., Ltd. | History | Reduced | 866 | 4 | 0.0% | 0.0% | 30 | -7,804 | -90.01% | Q1 2026 | Apr 27, 2026 |
| ROYAL BANK OF CANADA | History | Reduced | 855 | 4 | 0.0% | 0.0% | 29 | -3,940 | -82.17% | Q1 2026 | May 15, 2026 |
| Brown Shipley& Co Ltd | History | Reduced | 478 | 2 | 0.0% | 0.0% | 31 | -4,305 | -90.01% | Q1 2026 | May 06, 2026 |
| NISA INVESTMENT ADVISORS, LLC | History | Reduced | 228 | 1 | 0.0% | 0.0% | 32 | -2,061 | -90.04% | Q1 2026 | Apr 30, 2026 |
| Portolan Capital Management, LLC | History | Closed out | 0 | 0 | — | 0.01% | — | -409,650 | -100.0% | Q1 2026 | May 15, 2026 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | History | Closed out | 0 | 0 | — | 0.0% | — | -139,869 | -100.0% | Q1 2026 | May 15, 2026 |
| Assenagon Asset Management S.A. | History | Closed out | 0 | 0 | — | 0.0% | — | -139,218 | -100.0% | Q1 2026 | Apr 20, 2026 |
| NORTHERN TRUST CORP | History | Closed out | 0 | 0 | — | 0.0% | — | -91,973 | -100.0% | Q1 2026 | May 14, 2026 |
| CITADEL ADVISORS LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -62,292 | -100.0% | Q1 2026 | May 15, 2026 |
| Virtu Financial LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -59,508 | -100.0% | Q1 2026 | May 14, 2026 |
| GAMCO INVESTORS, INC. ET AL | History | Closed out | 0 | 0 | — | 0.0% | — | -57,000 | -100.0% | Q1 2026 | May 14, 2026 |
| GOLDMAN SACHS GROUP INC | History | Closed out | 0 | 0 | — | 0.0% | — | -49,751 | -100.0% | Q1 2026 | May 15, 2026 |
| Pasadena Private Wealth, LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -45,000 | -100.0% | Q1 2026 | Apr 22, 2026 |
| Legato Capital Management LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -43,467 | -100.0% | Q1 2026 | May 14, 2026 |
| XTX Topco Ltd | History | Closed out | 0 | 0 | — | 0.0% | — | -39,349 | -100.0% | Q1 2026 | May 15, 2026 |
| GABELLI FUNDS LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -39,000 | -100.0% | Q1 2026 | May 14, 2026 |
| Callan Family Office, LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -29,791 | -100.0% | Q1 2026 | May 13, 2026 |
| DIMENSIONAL FUND ADVISORS LP | History | Closed out | 0 | 0 | — | 0.0% | — | -27,792 | -100.0% | Q1 2026 | May 07, 2026 |
| GREENWOOD CAPITAL ASSOCIATES LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -27,754 | -100.0% | Q1 2026 | Apr 29, 2026 |
| Abel Hall, LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -25,283 | -100.0% | Q1 2026 | Apr 28, 2026 |
| TWO SIGMA SECURITIES, LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -17,549 | -100.0% | Q1 2026 | May 15, 2026 |
| Qube Research & Technologies Ltd | History | Closed out | 0 | 0 | — | 0.0% | — | -17,029 | -100.0% | Q1 2026 | May 15, 2026 |
| Vanguard Personalized Indexing Management, LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -16,542 | -100.0% | Q1 2026 | May 14, 2026 |
| Point72 Asset Management, L.P. | History | Closed out | 0 | 0 | — | 0.0% | — | -14,717 | -100.0% | Q1 2026 | May 15, 2026 |
| SIMPLEX TRADING, LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -13,790 | -100.0% | Q1 2026 | May 14, 2026 |
| CERTUITY, LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -13,677 | -100.0% | Q1 2026 | May 11, 2026 |
| GSK plc | History | Closed out | 0 | 0 | — | 0.0% | — | -11,151 | -100.0% | Q1 2026 | May 14, 2026 |
| Ethic Inc. | History | Closed out | 0 | 0 | — | 0.0% | — | -10,942 | -100.0% | Q1 2026 | Apr 27, 2026 |
| Balboa Wealth Partners | History | Closed out | 0 | 0 | — | 0.0% | — | -10,000 | -100.0% | Q1 2026 | Apr 16, 2026 |
| FEDERATED HERMES, INC. | History | Reduced | 73 | 0 | — | 0.0% | — | -1,583 | -95.59% | Q1 2026 | May 11, 2026 |
| BNP PARIBAS FINANCIAL MARKETS | History | Reduced | 68 | 0 | — | — | — | -612 | -90.0% | Q1 2026 | May 12, 2026 |
| BANK OF AMERICA CORP /DE/ | History | Closed out | 0 | 0 | — | — | — | -451 | -100.0% | Q1 2026 | May 15, 2026 |
| Financial Connections Group, Inc. | History | Reduced | 30 | 0 | — | — | — | -270 | -90.0% | Q1 2026 | May 01, 2026 |
| PNC FINANCIAL SERVICES GROUP, INC. | History | Reduced | 14 | 0 | — | — | — | -130 | -90.28% | Q1 2026 | May 08, 2026 |
| SHP Wealth Management | History | Reduced | 10 | 0 | — | — | — | -90 | -90.0% | Q1 2026 | May 08, 2026 |
| CWM, LLC | History | Reduced | 4 | 0 | — | — | — | -50 | -92.59% | Q1 2026 | May 14, 2026 |
| BARCLAYS PLC | History | Closed out | 0 | 0 | — | — | — | -21 | -100.0% | Q1 2026 | May 14, 2026 |
| Optiver Holding B.V. | History | Closed out | 0 | 0 | — | — | — | -14 | -100.0% | Q1 2026 | May 15, 2026 |