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ESSEX INVESTMENT MANAGEMENT CO LLC
Period ended Sep 30, 2026 · Latest filing Oct 19, 2026
These quarterly holdings are delayed and may not include all assets or short positions.
Values are from the reporting date, not current prices or purchase costs.
The same security may appear in multiple rows.
Source: SEC
Reported portfolio value
Quarter-end reported holdings; not current value or investment performance.
View reported values
- Sep 30, 2026: $674,703,164
More quarters will appear as history becomes available.
Top holdings
Top 10 at Sep 30, 2026. Matching entries are combined; security classes and options remain separate. Shares exclude principal amounts; option shares reflect the reported underlying amount.
View top holdings values
- TOWER SEMICONDUCTOR LTD · COM · M87915274 · shares: $20,814,166
- KINIKSA PHARMACEUTICALS INTL P · COM · G52694109 · shares: $15,072,787
- LIGAND PHARMACEUTICALS INC · COM · 53220K504 · shares: $12,156,503
- ADAPTIVE BIOTECHNOLOGIES CORP · COM · 00650F109 · shares: $11,610,142
- APPLE INC · COM · 037833100 · shares: $10,351,594
- CECO ENVIRONMENTAL CORP · COM · 125141101 · shares: $10,147,732
- HCI GROUP INC · COM · 40416E103 · shares: $9,435,297
- LEONARDO DRS INC · COM · 52661A108 · shares: $8,882,006
- MIRUM PHARMACEUTICALS INC · COM · 604749101 · shares: $8,694,684
- COHU INC · COM · 192576106 · shares: $8,666,045
Reported holdings
301 reported entries| Issuer | Class | CUSIP | Type | Shares / principal | Reported value (USD) |
|---|---|---|---|---|---|
| TOWER SEMICONDUCTOR LTD | COM | M87915274 | — | 91,519 shares | $20,814,166 |
| KINIKSA PHARMACEUTICALS INTL P | COM | G52694109 | — | 202,021 shares | $15,072,787 |
| LIGAND PHARMACEUTICALS INC | COM | 53220K504 | — | 38,917 shares | $12,156,503 |
| ADAPTIVE BIOTECHNOLOGIES CORP | COM | 00650F109 | — | 401,735 shares | $11,610,142 |
| APPLE INC | COM | 037833100 | — | 31,084 shares | $10,351,594 |
| CECO ENVIRONMENTAL CORP | COM | 125141101 | — | 145,717 shares | $10,147,732 |
| HCI GROUP INC | COM | 40416E103 | — | 54,282 shares | $9,435,297 |
| LEONARDO DRS INC | COM | 52661A108 | — | 242,479 shares | $8,882,006 |
| MIRUM PHARMACEUTICALS INC | COM | 604749101 | — | 101,716 shares | $8,694,684 |
| COHU INC | COM | 192576106 | — | 127,180 shares | $8,666,045 |
| AVEPOINT INC | COM | 053604104 | — | 551,987 shares | $7,771,977 |
| STERLING INFRASTRUCTURE INC | COM | 859241101 | — | 15,536 shares | $7,640,294 |
| TRAVERE THERAPEUTICS INC | COM | 89422G107 | — | 129,493 shares | $7,624,548 |
| BRAINSWAY LTD | ADR | 10501L106 | — | 574,818 shares | $7,587,598 |
| GE VERNOVA INC | COM | 36828A101 | — | 7,978 shares | $7,583,009 |
| NUVATION BIO INC | COM | 67080N101 | — | 1,344,871 shares | $7,531,278 |
| WERNER ENTERPRISES INC | COM | 950755108 | — | 220,515 shares | $7,493,100 |
| MICROSOFT CORP | COM | 594918104 | — | 14,469 shares | $7,421,150 |
| FREQUENCY ELECTRS INC | COM | 358010106 | — | 86,267 shares | $7,292,150 |
| BIODESIX INC | COM | 09075X207 | — | 234,542 shares | $6,996,388 |
| AGNICO EAGLE MINES LTD | COM | 008474108 | — | 37,195 shares | $6,816,728 |
| NOVOCURE LTD | COM | G6674U108 | — | 424,133 shares | $6,764,921 |
| XERIS BIOPHARMA HOLDINGS INC | COM | 98422E103 | — | 693,260 shares | $6,627,566 |
| SEMTECH CORP | COM | 816850101 | — | 37,026 shares | $6,603,587 |
| MARVELL TECHNOLOGY INC | COM | 573874104 | — | 24,845 shares | $6,564,297 |
| GRAHAM CORP | COM | 384556106 | — | 75,219 shares | $6,492,152 |
| AMAZON COM INC | COM | 023135106 | — | 25,879 shares | $6,447,753 |
| LANTRONIX INC | COM | 516548203 | — | 889,983 shares | $6,416,777 |
| OCEANEERING INTL INC | COM | 675232102 | — | 146,483 shares | $6,391,053 |
| GOLDMAN SACHS GROUP INC | COM | 38141G104 | — | 7,069 shares | $6,364,645 |
| ARTERIS INC | COM | 04302A104 | — | 268,987 shares | $6,358,853 |
| KRATOS DEFENSE & SEC SOLUTIONS | COM | 50077B207 | — | 148,246 shares | $6,328,622 |
| OUSTER INC | COM | 68989M202 | — | 152,925 shares | $6,168,995 |
| ASML HLDG NV | ADR | N07059210 | — | 3,394 shares | $6,148,808 |
| LINCOLN EDL SVCS CORP | COM | 533535100 | — | 278,205 shares | $6,084,343 |
| AMERICAN SUPERCONDUCTOR CORP | COM | 030111207 | — | 205,382 shares | $5,978,670 |
| BLUELINX HLDGS INC | COM | 09624H208 | — | 83,955 shares | $5,971,719 |
| LSI INDS INC OHIO | COM | 50216C108 | — | 287,681 shares | $5,969,381 |
| RISKIFIED LTD | COM | M8216R109 | — | 745,621 shares | $5,897,862 |
| PRECIGEN INC | COM | 74017N105 | — | 683,419 shares | $5,850,067 |
| ARGAN INC | COM | 04010E109 | — | 15,016 shares | $5,675,297 |
| 908 DEVICES INC | COM | 65443P102 | — | 455,706 shares | $5,623,412 |
| XOMETRY INC | COM | 98423F109 | — | 54,162 shares | $5,570,562 |
| SOPHIA GENETICS SA | COM | H82027105 | — | 643,129 shares | $5,389,421 |
| AMBARELLA INC | COM | G037AX101 | — | 77,245 shares | $5,369,300 |
| WILLDAN GROUP INC | COM | 96924N100 | — | 72,557 shares | $5,360,511 |
| PATRICK INDS INC | COM | 703343103 | — | 78,964 shares | $5,352,180 |
| GENTHERM INC | COM | 37253A103 | — | 158,243 shares | $5,269,492 |
| MISTRAS GROUP INC | COM | 60649T107 | — | 249,209 shares | $5,248,342 |
| FORUM ENERGY TECHNOLOGIES INC | COM | 34984V209 | — | 64,563 shares | $5,226,375 |
| RED VIOLET INC | COM | 75704L104 | — | 63,732 shares | $5,035,465 |
| ADVANCED DRAIN SYS INC DEL | COM | 00790R104 | — | 39,200 shares | $4,967,032 |
| SI BONE INC | COM | 825704109 | — | 263,101 shares | $4,946,299 |
| CONCENTRA GROUP HOLDINGS PAREN | COM | 20603L102 | — | 142,065 shares | $4,889,877 |
| JAZZ PHARMACEUTICALS PLC | COM | G50871105 | — | 20,819 shares | $4,820,015 |
| INSMED INC | COM | 457669307 | — | 41,471 shares | $4,733,500 |
| DIODES INC | COM | 254543101 | — | 45,241 shares | $4,378,876 |
| MITEK SYS INC | COM | 606710200 | — | 255,853 shares | $4,362,294 |
| INFORMATION SVCS GROUP INC | COM | 45675Y104 | — | 783,636 shares | $4,333,507 |
| COLUMBUS MCKINNON CORP N Y | COM | 199333105 | — | 269,821 shares | $4,298,249 |
| LIQUIDITY SVCS INC | COM | 53635B107 | — | 100,074 shares | $4,286,169 |
| WATTS WATER TECHNOLOGIES INC | COM | 942749102 | — | 11,985 shares | $4,244,847 |
| CROWDSTRIKE HLDGS INC | COM | 22788C105 | — | 16,017 shares | $4,240,501 |
| NOVANTA INC | COM | 67000B104 | — | 29,696 shares | $4,222,474 |
| TETRA TECHNOLOGIES INC DEL | COM | 88162F105 | — | 717,931 shares | $4,214,255 |
| AMERANT BANCORP INC | COM | 023576101 | — | 145,593 shares | $4,174,151 |
| EVERUS CONSTR GROUP | COM | 300426103 | — | 35,182 shares | $4,134,589 |
| PARK AEROSPACE CORP | COM | 70014A104 | — | 139,188 shares | $4,132,492 |
| IBEX LTD | COM | G4690M101 | — | 95,123 shares | $4,115,021 |
| INTERFACE INC | COM | 458665304 | — | 119,416 shares | $4,107,910 |
| MAMAS CREATIONS INC | COM | 56146T103 | — | 316,744 shares | $4,082,830 |
| GRIFFON CORP | COM | 398433102 | — | 43,460 shares | $4,043,518 |
| MIRION TECHNOLOGIES INC | COM | 60471A101 | — | 285,357 shares | $4,029,241 |
| EVERPURE INC | COM | 74624M102 | — | 30,793 shares | $4,027,109 |
| JOHNSON OUTDOORS INC | COM | 479167108 | — | 91,310 shares | $3,985,682 |
| ALPHA COGNITION INC | COM | 02074J501 | — | 422,858 shares | $3,805,722 |
| EXZEO GROUP INC | COM | 30234F101 | — | 256,229 shares | $3,707,634 |
| NVIDIA CORPORATION | COM | 67066G104 | — | 16,210 shares | $3,702,040 |
| GLOBUS MED INC | COM | 379577208 | — | 49,303 shares | $3,692,795 |
| DOCEBO INC | COM | 25609L105 | — | 160,089 shares | $3,690,051 |
| ORION GROUP HLDGS INC | COM | 68628V308 | — | 429,003 shares | $3,667,976 |
| LGI HOMES INC | COM | 50187T106 | — | 78,553 shares | $3,663,712 |
| DAKTRONICS INC | COM | 234264109 | — | 209,874 shares | $3,649,709 |
| ZETA GLOBAL HOLDINGS CORP | COM | 98956A105 | — | 113,829 shares | $3,593,582 |
| BGC GROUP INC | COM | 088929104 | — | 310,920 shares | $3,584,908 |
| OCULAR THERAPEUTIX INC | COM | 67576A100 | — | 467,325 shares | $3,584,383 |
| ARCUTIS BIOTHERAPEUTICS INC | COM | 03969K108 | — | 132,924 shares | $3,513,181 |
| INNOVATIVE SOLUTIONS & SUPPORT | COM | 45769N105 | — | 184,874 shares | $3,433,110 |
| FENNEC PHARMACEUTICALS INC | COM | 31447P100 | — | 318,771 shares | $3,394,911 |
| BADGER METER INC | COM | 056525108 | — | 27,446 shares | $3,390,679 |
| CODA OCTOPUS GROUP INC | COM | 19188U206 | — | 312,533 shares | $3,353,479 |
| BWX TECHNOLOGIES INC | COM | 05605H100 | — | 24,473 shares | $3,352,801 |
| OCEANFIRST FINL CORP | COM | 675234108 | — | 198,887 shares | $3,287,602 |
| DOLLAR TREE INC | COM | 256746108 | — | 28,367 shares | $3,234,405 |
| LEGACY ED INC | COM | 52474R207 | — | 320,990 shares | $3,103,973 |
| SPROUTS FMRS MKT INC | COM | 85208M102 | — | 45,830 shares | $3,040,821 |
| GUIDEWIRE SOFTWARE INC | COM | 40171V100 | — | 20,237 shares | $2,885,391 |
| AXSOME THERAPEUTICS INC. | COM | 05464T104 | — | 15,616 shares | $2,879,434 |
| LIGHTPATH TECHNOLOGIES INC | COM | 532257805 | — | 277,089 shares | $2,856,788 |
| BAKER HUGHES COMPANY | COM | 05722G100 | — | 52,020 shares | $2,855,898 |