New Positions
11 managers initiated
Top five by reported value
Harvard Bioscience Inc NASDAQ NMS - GLOBAL MARKET:HBIO
Institutional holders, quarter-over-quarter share deltas, and new and closed positions disclosed in Form 13F. Period 2025-12-31 · prior 2025-09-30.
11 new24 added28 reduced12 exited
Total Institutional Holders
63
as of 2025-12-31
Top Holder
WEBER CAPITAL MANAGEMENT LLC /ADV
$2.1M
Largest QoQ Increase
WEBER CAPITAL MANAGEMENT LLC /ADV
+3,200,380 sh
Largest QoQ Decrease
AMH Equity Ltd
-4,047,535 sh
New Positions(11)
| Manager | Shares | Δ Shares | Value | Δ Value | % Δ |
|---|---|---|---|---|---|
| WEBER CAPITAL MANAGEMENT LLC /ADV | 3,200,380 | +3,200,380 | $2.1M | +$2.1M | — |
| NANO CAP NEW MILLENNIUM GROWTH FUND L P | 600,000 | +600,000 | $401.3K | +$401.3K | — |
| Portolan Capital Management, LLC | 409,650 | +409,650 | $274.0K | +$274.0K | — |
| ESSEX INVESTMENT MANAGEMENT CO LLC | 184,678 | +184,678 | $123.5K | +$123.5K | — |
| GAMCO INVESTORS, INC. ET AL | 57,000 | +57,000 | $38.1K | +$38.1K | — |
| XTX Topco Ltd | 39,349 | +39,349 | $26.3K | +$26.3K | — |
| TWO SIGMA SECURITIES, LLC | 17,549 | +17,549 | $11.7K | +$11.7K | — |
| Vanguard Personalized Indexing Management, LLC | 16,542 | +16,542 | $11.1K | +$11.1K | — |
| Point72 Asset Management, L.P. | 14,717 | +14,717 | $9.8K | +$9.8K | — |
| GSK plc | 11,151 | +11,151 | $7.5K | +$7.5K | — |
| Virtu Financial LLC | 59,508 | +59,508 | $40 | +$40 | — |
Added To(24)
| Manager | Shares | Δ Shares | Value | Δ Value | % Δ |
|---|---|---|---|---|---|
| CORSAIR CAPITAL MANAGEMENT, L.P. | 1,108,692 | +1,008,692 | $741.5K | +$697.6K | 1008.7% |
| TWO SIGMA ADVISERS, LP | 878,556 | +635,400 | $587.6K | +$481.0K | 261.3% |
| VANGUARD GROUP INC | 1,923,275 | +71,429 | $1.3M | +$473.7K | 3.9% |
| TWO SIGMA INVESTMENTS, LP | 1,012,417 | +538,260 | $677.1K | +$469.2K | 113.5% |
| Meros Investment Management, LP | 1,217,628 | +299,369 | $814.4K | +$411.7K | 32.6% |
| RENAISSANCE TECHNOLOGIES LLC | 1,021,241 | +152,763 | $683.0K | +$302.2K | 17.6% |
| JANE STREET GROUP, LLC | 444,959 | +404,395 | $297.6K | +$279.8K | 996.9% |
| RBF Capital, LLC | 320,000 | +160,000 | $214.0K | +$143.9K | 100.0% |
| BlackRock, Inc. | 622,296 | +929 | $416.2K | +$143.7K | 0.1% |
| CITIGROUP INC | 193,828 | +192,319 | $129.6K | +$129.0K | 12744.8% |
| GEODE CAPITAL MANAGEMENT, LLC | 460,793 | +18,923 | $308.2K | +$114.4K | 4.3% |
| Williams & Novak, LLC | 348,800 | +73,300 | $233.3K | +$112.5K | 26.6% |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 139,869 | +55,520 | $93.5K | +$56.6K | 65.8% |
| GOLDMAN SACHS GROUP INC | 49,751 | +37,057 | $33.3K | +$27.7K | 291.9% |
| CITADEL ADVISORS LLC | 62,292 | +19,892 | $41.7K | +$23.1K | 46.9% |
| Legato Capital Management LLC | 43,467 | +29,462 | $29.1K | +$22.9K | 210.4% |
| GROUP ONE TRADING, L.P. | 25,513 | +23,700 | $17.1K | +$16.3K | 1307.2% |
| SIMPLEX TRADING, LLC | 13,790 | +11,041 | $9.2K | +$9.2K | 401.6% |
| UBS Group AG | 21,213 | +7,934 | $14.2K | +$8.4K | 59.7% |
| Royal Bank of Canada | 4,795 | +2,454 | $3.0K | +$2.0K | 104.8% |
| ACADIAN ASSET MANAGEMENT LLC | 1,772,627 | +702,937 | $1.2K | +$717 | 65.7% |
| JPMORGAN CHASE & CO | 1,960 | +323 | $1.3K | +$593 | 19.7% |
| BARCLAYS PLC | 892 | +891 | $395 | +$395 | 89100.0% |
| BANK OF AMERICA CORP /DE/ | 451 | +9 | $301 | +$108 | 2.0% |
Reduced(28)
| Manager | Shares | Δ Shares | Value | Δ Value | % Δ |
|---|---|---|---|---|---|
| DIMENSIONAL FUND ADVISORS LP | 27,792 | -468,352 | $18.6K | -$199.0K | -94.4% |
| MILLENNIUM MANAGEMENT LLC | 546,067 | -25,636 | $365.2K | +$114.5K | -4.5% |
| Pasadena Private Wealth, LLC | 45,000 | -198,911 | $30.1K | -$76.9K | -81.5% |
| STATE STREET CORP | 149,352 | 0 | $99.9K | +$34.4K | 0.0% |
| Assenagon Asset Management S.A. | 139,218 | -2 | $93.1K | +$32.1K | 0.0% |
| Bank of New York Mellon Corp | 126,223 | 0 | $84.4K | +$29.1K | 0.0% |
| GABELLI FUNDS LLC | 39,000 | 0 | $26.1K | +$9.0K | 0.0% |
| Callan Family Office, LLC | 29,791 | -53 | $19.9K | +$6.8K | -0.2% |
| GREENWOOD CAPITAL ASSOCIATES LLC | 27,754 | 0 | $18.6K | +$6.4K | 0.0% |
| Qube Research & Technologies Ltd | 17,029 | -20,226 | $11.4K | -$4.9K | -54.3% |
| MORGAN STANLEY | 16,686 | -17 | $11.2K | +$3.8K | -0.1% |
| PNC Financial Services Group, Inc. | 144 | -7,400 | $96 | -$3.2K | -98.1% |
| Camden Capital, LLC | 13,677 | 0 | $9.1K | +$3.1K | 0.0% |
| Abel Hall, LLC | 25,283 | -6,923 | $16.9K | +$2.8K | -21.5% |
| NORTHERN TRUST CORP | 91,973 | -53,200 | $61.5K | -$2.1K | -36.6% |
| Tower Research Capital LLC (TRC) | 2,395 | -6,067 | $1.6K | -$2.1K | -71.7% |
| FMR LLC | 32,899 | -12,694 | $22.0K | +$2.0K | -27.8% |
| SBI Securities Co., Ltd. | 8,670 | 0 | $5.8K | +$2.0K | 0.0% |
| Ethic Inc. | 10,942 | -1,497 | $7.3K | +$1.9K | -12.0% |
| Balboa Wealth Partners | 10,000 | -1,750 | $6.7K | +$1.5K | -14.9% |
| Brown Shipley& Co Ltd | 4,783 | 0 | $3.2K | +$1.1K | 0.0% |
| NISA INVESTMENT ADVISORS, LLC | 2,289 | 0 | $1.5K | +$527 | 0.0% |
| FEDERATED HERMES, INC. | 1,656 | 0 | $1.1K | +$382 | 0.0% |
| NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO | 4 | -1,896 | $651 | -$182 | -99.8% |
| BNP PARIBAS ARBITRAGE, SNC | 680 | 0 | $455 | +$157 | 0.0% |
| Optiver Holding B.V. | 14 | 0 | $9 | +$3 | 0.0% |
| CWM, LLC | 54 | -19 | $0 | $0 | -26.0% |
| Financial Connections Group, Inc. | 300 | 0 | $0 | $0 | 0.0% |
Sold Out(12)
| Manager | Shares | Δ Shares | Value | Δ Value | % Δ |
|---|---|---|---|---|---|
| NEW YORK STATE COMMON RETIREMENT FUND | 0 | -834,889 | $0 | -$3.6M | — |
| AMH Equity Ltd | 0 | -4,047,535 | $0 | -$1.8M | — |
| Harvey Partners, LLC | 0 | -2,050,000 | $0 | -$898.9K | — |
| Granahan Investment Management, LLC | 0 | -603,519 | $0 | -$264.6K | — |
| Acuitas Investments, LLC | 0 | -491,092 | $0 | -$215.3K | — |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 0 | -98,883 | $0 | -$56.0K | — |
| BRIGHTON JONES LLC | 0 | -25,007 | $0 | -$11.0K | — |
| Point72 Asia (Singapore) Pte. Ltd. | 0 | -14,697 | $0 | -$6.4K | — |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | 0 | -12,500 | $0 | -$5.5K | — |
| WOLVERINE TRADING, LLC | 0 | -11,600 | $0 | -$5.1K | — |
| EverSource Wealth Advisors, LLC | 0 | -1,219 | $0 | -$535 | — |
| Rialto Wealth Management, LLC | 0 | -1,081 | $0 | -$475 | — |
Top Holders by reported value
Ranked by the dollar value reported on the latest Form 13F. Share counts reflect long positions as of 2025-12-31.
| Manager | Shares | $ Value | Δ Shares | QoQ % |
|---|---|---|---|---|
| WEBER CAPITAL MANAGEMENT LLC /ADV | 3,200,380 | $2.1M | +3,200,380 | — |
| VANGUARD GROUP INC | 1,923,275 | $1.3M | +71,429 | 3.9% |
| Meros Investment Management, LP | 1,217,628 | $814.4K | +299,369 | 32.6% |
| CORSAIR CAPITAL MANAGEMENT, L.P. | 1,108,692 | $741.5K | +1,008,692 | 1008.7% |
| RENAISSANCE TECHNOLOGIES LLC | 1,021,241 | $683.0K | +152,763 | 17.6% |
| TWO SIGMA INVESTMENTS, LP | 1,012,417 | $677.1K | +538,260 | 113.5% |
| TWO SIGMA ADVISERS, LP | 878,556 | $587.6K | +635,400 | 261.3% |
| BlackRock, Inc. | 622,296 | $416.2K | +929 | 0.1% |
| NANO CAP NEW MILLENNIUM GROWTH FUND L P | 600,000 | $401.3K | +600,000 | — |
| MILLENNIUM MANAGEMENT LLC | 546,067 | $365.2K | -25,636 | -4.5% |
| GEODE CAPITAL MANAGEMENT, LLC | 460,793 | $308.2K | +18,923 | 4.3% |
| JANE STREET GROUP, LLC | 444,959 | $297.6K | +404,395 | 996.9% |
| Portolan Capital Management, LLC | 409,650 | $274.0K | +409,650 | — |
| Williams & Novak, LLC | 348,800 | $233.3K | +73,300 | 26.6% |
| RBF Capital, LLC | 320,000 | $214.0K | +160,000 | 100.0% |
| CITIGROUP INC | 193,828 | $129.6K | +192,319 | 12744.8% |
| ESSEX INVESTMENT MANAGEMENT CO LLC | 184,678 | $123.5K | +184,678 | — |
| STATE STREET CORP | 149,352 | $99.9K | 0 | 0.0% |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 139,869 | $93.5K | +55,520 | 65.8% |
| Assenagon Asset Management S.A. | 139,218 | $93.1K | -2 | 0.0% |
New & Closed Positions this quarter
Closed Positions
12 managers exited
Top five by prior-quarter value
Methodology
Form 13F is the SEC's quarterly disclosure for institutional investment managers exercising discretion over $100 million or more in qualifying U.S. equity securities. Managers must file within 45 days of each calendar quarter end, which is why holdings shown here reflect a snapshot at the period date — not real-time positioning.
Quarter-over-quarter deltas compare each manager's most recently reported share count for HBIO against its prior-quarter count. New positions are entries where the prior count was zero; closed positions are entries where the current count is zero. Amendments (13F-HR/A) replace prior filings for the same period.
Source: SEC EDGAR Form 13F (XML information tables). Dollar values are as reported by the manager and may use mid-quarter pricing conventions. CUSIP-to-ticker resolution is best-effort.