Holders — by stockHoldings — by fund
ESSEX INVESTMENT MANAGEMENT CO LLC
Everything this manager disclosed owning in US-listed stocks — its complete Form 13F portfolio · as of 2026-06-30 · filed with the SEC up to 45 days after quarter end · CIK 0000201772
$763.4M
disclosed book value
306
positions
3.6%
largest position share
Positions, as of 2026-06-30
top 100 of 306 · 13F covers long US-listed positions only — cash, bonds, private and foreign stakes are not disclosed · PUT/CALL tags = options positions (share-equivalents), not shares held
| # | Issuer | Shares | Value | % of book |
|---|---|---|---|---|
| 1 | TOWER SEMICONDUCTOR LTD | 105,543 | $27.5M | 3.6% |
| 2 | LINCLINCOLN EDL SVCS CORP | 340,366 | $17.0M | 2.2% |
| 3 | KINIKSA PHARMACEUTICALS INTL P | 241,382 | $15.4M | 2% |
| 4 | OUSTOUSTER INC | 226,028 | $14.1M | 1.9% |
| 5 | LGNDLIGAND PHARMACEUTICALS INC | 43,567 | $13.8M | 1.8% |
| 6 | CECOCECO ENVIRONMENTAL CORP | 150,416 | $13.6M | 1.8% |
| 7 | STRLSTERLING INFRASTRUCTURE INC | 16,155 | $13.6M | 1.8% |
| 8 | AIPARTERIS INC | 277,665 | $13.5M | 1.8% |
| 9 | MIRMMIRUM PHARMACEUTICALS INC | 105,669 | $12.4M | 1.6% |
| 10 | AGXARGAN INC | 15,467 | $12.4M | 1.6% |
| 11 | GHMGRAHAM CORP | 93,405 | $11.6M | 1.5% |
| 12 | DRSLEONARDO DRS INC | 250,215 | $10.7M | 1.4% |
| 13 | ADPTADAPTIVE BIOTECHNOLOGIES CORP | 472,763 | $10.1M | 1.3% |
| 14 | WERNWERNER ENTERPRISES INC | 231,625 | $10.1M | 1.3% |
| 15 | HCIHCI GROUP INC | 56,260 | $9.9M | 1.3% |
| 16 | GEVGE VERNOVA INC | 8,283 | $9.7M | 1.3% |
| 17 | COHUCOHU INC | 131,170 | $9.7M | 1.3% |
| 18 | AAPLAPPLE INC | 32,427 | $9.4M | 1.2% |
| 19 | AMSCAMERICAN SUPERCONDUCTOR CORP | 221,933 | $9.2M | 1.2% |
| 20 | BWAYBRAINSWAY LTD | 592,606 | $9.2M | 1.2% |
| 21 | TTITETRA TECHNOLOGIES INC DEL | 741,007 | $8.4M | 1.1% |
| 22 | LYTSLSI INDS INC OHIO | 295,820 | $7.9M | 1% |
| 23 | MRVLMARVELL TECHNOLOGY INC | 25,911 | $7.7M | 1% |
| 24 | KTOSKRATOS DEFENSE & SEC SOLUTIONS | 153,576 | $7.7M | 1% |
| 25 | TVTXTRAVERE THERAPEUTICS INC | 133,866 | $7.6M | 1% |
| 26 | GSGOLDMAN SACHS GROUP INC | 7,513 | $7.6M | 1% |
| 27 | PATKPATRICK INDS INC | 82,960 | $7.4M | 1% |
| 28 | ORNORION GROUP HLDGS INC | 442,603 | $7.4M | 1% |
| 29 | ASML HLDG NV | 3,538 | $7.0M | 0.9% |
| 30 | AMBARELLA INC | 79,997 | $6.9M | 0.9% |
| 31 | NOVOCURE LTD | 439,648 | $6.7M | 0.9% |
| 32 | AMZNAMAZON COM INC | 27,062 | $6.4M | 0.8% |
| 33 | AVPTAVEPOINT INC | 571,541 | $6.4M | 0.8% |
| 34 | WMSADVANCED DRAIN SYS INC DEL | 40,413 | $6.3M | 0.8% |
| 35 | SMTCSEMTECH CORP | 38,226 | $6.2M | 0.8% |
| 36 | OIIOCEANEERING INTL INC | 151,463 | $6.1M | 0.8% |
| 37 | ECGEVERUS CONSTR GROUP | 36,377 | $6.0M | 0.8% |
| 38 | AEMAGNICO EAGLE MINES LTD | 38,462 | $6.0M | 0.8% |
| 39 | LQDALIQUIDIA CORPORATION | 74,743 | $6.0M | 0.8% |
| 40 | WLDNWILLDAN GROUP INC | 74,890 | $5.9M | 0.8% |
| 41 | FEIMFREQUENCY ELECTRS INC | 89,043 | $5.9M | 0.8% |
| 42 | MSFTMICROSOFT CORP | 15,714 | $5.9M | 0.8% |
| 43 | MAMAMAMAS CREATIONS INC | 326,938 | $5.8M | 0.8% |
| 44 | XERSXERIS BIOPHARMA HOLDINGS INC | 715,608 | $5.7M | 0.7% |
| 45 | PKEPARK AEROSPACE CORP | 143,663 | $5.5M | 0.7% |
| 46 | BDSXBIODESIX INC | 241,915 | $5.5M | 0.7% |
| 47 | XMTRXOMETRY INC | 55,919 | $5.4M | 0.7% |
| 48 | BXCBLUELINX HLDGS INC | 86,593 | $5.4M | 0.7% |
| 49 | MITKMITEK SYS INC | 263,913 | $5.3M | 0.7% |
| 50 | CXDOCREXENDO INC | 710,874 | $5.3M | 0.7% |
| 51 | MIRMIRION TECHNOLOGIES INC | 295,060 | $5.3M | 0.7% |
| 52 | RDVTRED VIOLET INC | 82,555 | $5.3M | 0.7% |
| 53 | JAZZ PHARMACEUTICALS PLC | 21,665 | $5.2M | 0.7% |
| 54 | DIODDIODES INC | 46,732 | $5.1M | 0.7% |
| 55 | APYXAPYX MEDICAL CORPORATION | 1.1M | $5.1M | 0.7% |
| 56 | BWXTBWX TECHNOLOGIES INC | 25,431 | $5.0M | 0.6% |
| 57 | OCULOCULAR THERAPEUTIX INC | 482,154 | $4.7M | 0.6% |
| 58 | SFMSPROUTS FMRS MKT INC | 55,176 | $4.7M | 0.6% |
| 59 | LPTHLIGHTPATH TECHNOLOGIES INC | 285,052 | $4.7M | 0.6% |
| 60 | INSMINSMED INC | 42,991 | $4.6M | 0.6% |
| 61 | XZOEXZEO GROUP INC | 268,704 | $4.5M | 0.6% |
| 62 | MGMISTRAS GROUP INC | 257,127 | $4.5M | 0.6% |
| 63 | SIBNSI BONE INC | 271,404 | $4.4M | 0.6% |
| 64 | CONCONCENTRA GROUP HOLDINGS PAREN | 148,836 | $4.4M | 0.6% |
| 65 | TILEINTERFACE INC | 123,401 | $4.4M | 0.6% |
| 66 | GFFGRIFFON CORP | 44,937 | $4.4M | 0.6% |
| 67 | JOUTJOHNSON OUTDOORS INC | 94,176 | $4.3M | 0.6% |
| 68 | DAKTDAKTRONICS INC | 216,428 | $4.2M | 0.6% |
| 69 | CMCOCOLUMBUS MCKINNON CORP N Y | 278,316 | $4.2M | 0.6% |
| 70 | BMIBADGER METER INC | 28,041 | $4.2M | 0.5% |
| 71 | MASS908 DEVICES INC | 470,244 | $4.1M | 0.5% |
| 72 | LQDTLIQUIDITY SVCS INC | 103,302 | $4.0M | 0.5% |
| 73 | PGENPRECIGEN INC | 706,294 | $4.0M | 0.5% |
| 74 | AXSMAXSOME THERAPEUTICS INC. | 16,244 | $4.0M | 0.5% |
| 75 | AMPXAMPRIUS TECHNOLOGIES INC | 284,595 | $3.9M | 0.5% |
| 76 | GMEDGLOBUS MED INC | 49,677 | $3.9M | 0.5% |
| 77 | LTRXLANTRONIX INC | 662,070 | $3.9M | 0.5% |
| 78 | LGCYLEGACY ED INC | 329,894 | $3.9M | 0.5% |
| 79 | RISKIFIED LTD | 769,085 | $3.9M | 0.5% |
| 80 | AMTBAMERANT BANCORP INC | 150,236 | $3.8M | 0.5% |
| 81 | SOPHIA GENETICS SA | 663,428 | $3.8M | 0.5% |
| 82 | NUVBNUVATION BIO INC | 671,041 | $3.8M | 0.5% |
| 83 | THRMGENTHERM INC | 107,970 | $3.7M | 0.5% |
| 84 | BKSYBLACKSKY TECHNOLOGY INC | 130,281 | $3.6M | 0.5% |
| 85 | ARQTARCUTIS BIOTHERAPEUTICS INC | 137,500 | $3.6M | 0.5% |
| 86 | DLTRDOLLAR TREE INC | 29,455 | $3.6M | 0.5% |
| 87 | BGCBGC GROUP INC | 321,484 | $3.4M | 0.5% |
| 88 | OSGOCTAVE SPECIALTY GROUP INC | 539,289 | $3.4M | 0.4% |
| 89 | FETFORUM ENERGY TECHNOLOGIES INC | 66,611 | $3.3M | 0.4% |
| 90 | IIIINFORMATION SVCS GROUP INC | 808,345 | $3.3M | 0.4% |
| 91 | NPCENEUROPACE INC | 208,703 | $3.3M | 0.4% |
| 92 | RAILFREIGHTCAR AMER INC | 337,662 | $3.3M | 0.4% |
| 93 | NOVTNOVANTA INC | 19,811 | $3.2M | 0.4% |
| 94 | CRWDCROWDSTRIKE HLDGS INC | 4,169 | $3.2M | 0.4% |
| 95 | CODACODA OCTOPUS GROUP INC | 322,278 | $3.1M | 0.4% |
| 96 | BKRBAKER HUGHES COMPANY | 54,375 | $3.0M | 0.4% |
| 97 | IBEX LTD | 98,156 | $3.0M | 0.4% |
| 98 | DCBODOCEBO INC | 165,095 | $3.0M | 0.4% |
| 99 | EVREVERCORE INC | 8,573 | $2.9M | 0.4% |
| 100 | BRCCBRC INC | 2.6M | $2.9M | 0.4% |
Source: SEC Form 13F-HR, reporting period 2026-06-30. Values are the manager's filed June-30-style quarter-end marks, not live prices. Research, not investment advice.