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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) |
|---|---|---|---|---|---|
| TRANSACT TECHNOLOGIES INC | COM | 892918103 | — | 43,161 shares | $208,899 |
| BOS BETTER ONLINE SOLUTIONS | COM | M20115180 | — | 43,855 shares | $206,996 |
| 374WATER INC | COM | 88583P203 | — | 63,303 shares | $205,735 |
| NETSOL TECHNOLOGIES INC | COM | 64115A402 | — | 37,424 shares | $205,458 |
| TESLA INC | COM | 88160R101 | — | 573 shares | $203,306 |
| CPS TECHNOLOGIES CORP | COM | 12619F104 | — | 54,324 shares | $203,172 |
| EXXONMOBIL HOLDINGS CORP | COM | 30233Q108 | — | 1,245 shares | $200,881 |
| PRECISION OPTICS CORP INC MASS | COM | 740294400 | — | 46,630 shares | $193,515 |
| AMPLITECH GROUP INC | COM | 03211Q200 | — | 60,526 shares | $190,052 |
| EOS ENERGY ENTERPRISES INC | COM | 29415C101 | — | 60,425 shares | $185,203 |
| SOUTHERN CO | COM | 842587107 | — | 2,223 shares | $184,264 |
| COMMERCIAL VEH GROUP INC | COM | 202608105 | — | 59,730 shares | $175,009 |
| DUOS TECHNOLOGIES GROUP INC | COM | 266042407 | — | 19,083 shares | $168,694 |
| APPLIED INDL TECHNOLOGIES INC | COM | 03820C105 | — | 505 shares | $167,806 |
| GSI TECHNOLOGY INC | COM | 36241U106 | — | 30,410 shares | $165,582 |
| AUTOMATIC DATA PROCESSING INC | COM | 053015103 | — | 641 shares | $165,416 |
| MERCK & CO INC | COM | 58933Y105 | — | 1,132 shares | $164,491 |
| COSTCO WHOLESALE CORPORATION | COM | 22160K105 | — | 180 shares | $163,861 |
| MICRON TECHNOLOGY INC | COM | 595112103 | — | 153 shares | $162,962 |
| MONOLITHIC PWR SYS INC | COM | 609839105 | — | 120 shares | $161,666 |
| FATPIPE INC UT | COM | 311921100 | — | 29,053 shares | $158,920 |
| FLEXIBLE SOLUTIONS INTL INC | COM | 33938T104 | — | 26,180 shares | $157,342 |
| ABBOTT LABORATORIES | COM | 002824100 | — | 1,523 shares | $150,518 |
| NEPHROS INC | COM | 640671400 | — | 38,927 shares | $144,419 |
| TRIO TECH INTL | COM | 896712205 | — | 22,115 shares | $143,748 |
| RF INDS LTD | COM | 749552105 | — | 17,864 shares | $141,483 |
| NOVA LTD | COM | M7516K103 | — | 359 shares | $138,287 |
| ORACLE CORP | COM | 68389X105 | — | 1,000 shares | $137,300 |
| FUEL TECH INC | COM | 359523107 | — | 77,159 shares | $124,998 |
| ALPHABET INC | COM | 02079K107 | — | 320 shares | $109,037 |
| GENASYS INC | COM | 36872P103 | — | 72,711 shares | $105,431 |
| WASTE MGMT INC DEL | COM | 94106L109 | — | 494 shares | $100,736 |
| TWIST BIOSCIENCE CORP | COM | 90184D100 | — | 502 shares | $97,006 |
| INTUIT | COM | 461202103 | — | 339 shares | $93,466 |
| FREEPORT MCMORAN INC | COM | 35671D857 | — | 1,297 shares | $90,790 |
| WABTEC | COM | 929740108 | — | 306 shares | $87,877 |
| CINCINNATI FINL CORP | COM | 172062101 | — | 549 shares | $87,494 |
| AMNEAL PHARMACEUTICALS INC | COM | 03168L105 | — | 4,295 shares | $86,501 |
| NVENT ELEC PLC | COM | G6700G107 | — | 508 shares | $81,468 |
| AMKOR TECHNOLOGY INC | COM | 031652100 | — | 1,526 shares | $79,932 |
| ROYAL GOLD INC | COM | 780287108 | — | 338 shares | $79,768 |
| PHILIP MORRIS INTL INC | COM | 718172109 | — | 402 shares | $76,710 |
| DTE ENERGY CO | COM | 233331107 | — | 602 shares | $73,324 |
| BRISTOL-MYERS SQUIBB CO | COM | 110122108 | — | 1,120 shares | $69,888 |
| RIO TINTO PLC | ADR | 767204100 | — | 713 shares | $67,143 |
| GLAUKOS CORP | COM | 377322102 | — | 407 shares | $66,825 |
| KINROSS GOLD CORP | COM | 496902404 | — | 2,661 shares | $64,077 |
| CLEAN HARBORS INC | COM | 184496107 | — | 193 shares | $59,874 |
| GATES INDL CORP LTD | COM | G39104107 | — | 1,996 shares | $52,295 |
| HINGE HEALTH INC | COM | 433313103 | — | 536 shares | $52,121 |
| FLOWSERVE CORP | COM | 34354P105 | — | 697 shares | $50,965 |
| CRISPR THERAPEUTICS AG | COM | H17182108 | — | 877 shares | $48,516 |
| WORKIVA INC | COM | 98139A105 | — | 728 shares | $48,463 |
| ARCOSA INC | COM | 039653100 | — | 331 shares | $48,376 |
| ATMUS FILTRATION TECHNOLOGIES | COM | 04956D107 | — | 1,112 shares | $48,283 |
| EXCELERATE ENERGY INC | COM | 30069T101 | — | 1,475 shares | $47,392 |
| DANA INC | COM | 235825205 | — | 1,665 shares | $45,471 |
| WEC ENERGY GROUP INC | COM | 92939U106 | — | 430 shares | $43,335 |
| REMITLY GLOBAL INC | COM | 75960P104 | — | 2,016 shares | $43,021 |
| ISHARES SILVER TR | ETF | 46428Q109 | — | 771 shares | $42,027 |
| PPL CORP | COM | 69351T106 | — | 1,238 shares | $40,718 |
| ACUITY INC | COM | 00508Y102 | — | 131 shares | $40,585 |
| RANGE RES CORP | COM | 75281A109 | — | 1,091 shares | $40,411 |
| WILLIAMS COS INC | COM | 969457100 | — | 573 shares | $38,947 |
| BERKSHIRE HATHAWAY INC DEL | COM | 084670702 | — | 76 shares | $37,844 |
| UNITED PARCEL SVCS INC | COM | 911312106 | — | 404 shares | $37,750 |
| AVIENT CORPORATION | COM | 05368V106 | — | 915 shares | $36,829 |
| Q2 HLDGS INC | COM | 74736L109 | — | 655 shares | $36,313 |
| DT MIDSTREAM INC | COM | 23345M107 | — | 301 shares | $35,960 |
| VIRTRA INC | COM | 92827K301 | — | 12,797 shares | $34,808 |
| INFINEON TECHNOLOGIES AG | ADR | 45662N103 | — | 511 shares | $34,441 |
| VISA INC | COM | 92826C839 | — | 92 shares | $33,058 |
| ITRON INC | COM | 465741106 | — | 362 shares | $31,255 |
| DUPONT DE NEMOURS INC | COM | 26614N201 | — | 238 shares | $30,914 |
| ROCKWELL AUTOMATION INC | COM | 773903109 | — | 70 shares | $30,473 |
| SEMPRA | COM | 816851109 | — | 390 shares | $30,404 |
| FIVE BELOW INC | COM | 33829M101 | — | 137 shares | $30,081 |
| BP PLC | ADR | 055622104 | — | 662 shares | $29,121 |
| EATON CORP PLC | COM | G29183103 | — | 66 shares | $28,361 |
| AMPHENOL CORP | COM | 032095101 | — | 336 shares | $28,325 |
| HELMERICH & PAYNE INC | COM | 423452101 | — | 733 shares | $27,224 |
| GENPACT LIMITED | COM | G3922B107 | — | 823 shares | $26,772 |
| ECOLAB INC | COM | 278865100 | — | 97 shares | $26,634 |
| SLB LIMITED | COM | 806857108 | — | 514 shares | $25,042 |
| XYLEM INC | COM | 98419M100 | — | 218 shares | $22,077 |
| ALKAMI TECHNOLOGY INC | COM | 01644J108 | — | 1,567 shares | $21,452 |
| ALPHABET INC | COM | 02079K305 | — | 62 shares | $21,333 |
| TERADYNE INC | COM | 880770102 | — | 52 shares | $20,847 |
| CONSTELLATION BRANDS INC | COM | 21036P108 | — | 178 shares | $20,125 |
| VANECK ETF TRUST | ETF | 92189F791 | — | 156 shares | $17,776 |
| SENESTECH INC | COM | 81720R604 | — | 26,203 shares | $17,732 |
| REGAL REXNORD CORPORATION | COM | 758750103 | — | 100 shares | $15,511 |
| QNITY ELECTRONICS INC | COM | 74743L100 | — | 106 shares | $13,328 |
| FEDEX CORP | COM | 31428X106 | — | 45 shares | $12,829 |
| CONTEMPORARY AMPEREX TECHNO | COM | 210919106 | — | 722 shares | $11,068 |
| UNION PAC CORP | COM | 907818108 | — | 35 shares | $9,525 |
| SANOFI SA | ADR | 80105N105 | — | 200 shares | $8,246 |
| SANDOZ GROUP AG | COM | 799926100 | — | 47 shares | $3,974 |
| FEDEX FGHT HLDG CO INC | COM | 314352105 | — | 22 shares | $2,406 |
| LYONDELLBASELL INDUSTRIES NV | COM | N53745100 | — | 25 shares | $1,437 |