SEC Form 13F

ESSEX INVESTMENT MANAGEMENT CO LLC 13F Holdings

Inspect ESSEX INVESTMENT MANAGEMENT CO LLC's 2026-06-30 SEC 13F positions, public filing date, amendments and original receipt.

As of 2026-08-07T03:59:59.999Z

Report period
2026-06-30
Publicly available
2026-08-07
Reported value
$763,373,957
Positions
306

Disclosed positions

TOWER SEMICONDUCTOR LTDTSEMCOM$27,508,728105,543SHNone
LINCOLN EDL SVCS CORPLINCCOM$16,984,263340,366SHNone
KINIKSA PHARMACEUTICALS INTL PKNSACOM$15,436,379241,382SHNone
OUSTER INCOUSTCOM$14,131,271226,028SHNone
LIGAND PHARMACEUTICALS INCLGNDCOM$13,771,09343,567SHNone
CECO ENVIRONMENTAL CORPCECOCOM$13,648,748150,416SHNone
STERLING INFRASTRUCTURE INCSTRLCOM$13,559,86116,155SHNone
ARTERIS INCAIPCOM$13,491,742277,665SHNone
MIRUM PHARMACEUTICALS INCMIRMCOM$12,370,670105,669SHNone
ARGAN INCAGXCOM$12,351,17315,467SHNone
GRAHAM CORPGHMCOM$11,562,60593,405SHNone
LEONARDO DRS INCDRSCOM$10,676,674250,215SHNone
ADAPTIVE BIOTECHNOLOGIES CORPADPTCOM$10,140,766472,763SHNone
WERNER ENTERPRISES INCWERNCOM$10,101,166231,625SHNone
HCI GROUP INCHCICOM$9,859,56556,260SHNone
GE VERNOVA INCGEVCOM$9,731,3658,283SHNone
COHU INCCOHUCOM$9,694,775131,170SHNone
APPLE INCAAPLCOM$9,383,07732,427SHNone
AMERICAN SUPERCONDUCTOR CORPAMSCCOM$9,212,439221,933SHNone
BRAINSWAY LTDBWAYADR$9,191,319592,606SHNone
TETRA TECHNOLOGIES INC DELTTICOM$8,395,609741,007SHNone
LSI INDS INC OHIOLYTSCOM$7,862,896295,820SHNone
MARVELL TECHNOLOGY INCMRVLCOM$7,718,62825,911SHNone
KRATOS DEFENSE & SEC SOLUTIONSKTOSCOM$7,657,299153,576SHNone
TRAVERE THERAPEUTICS INCTVTXCOM$7,604,927133,866SHNone
GOLDMAN SACHS GROUP INCGSCOM$7,598,4237,513SHNone
PATRICK INDS INCPATKCOM$7,448,14982,960SHNone
ORION GROUP HLDGS INCORNCOM$7,444,582442,603SHNone
ASML HLDG NVASMLADR$7,038,6393,538SHNone
AMBARELLA INCAMBACOM$6,863,74379,997SHNone
NOVOCURE LTDNVCRCOM$6,660,667439,648SHNone
AMAZON COM INCAMZNCOM$6,449,95727,062SHNone
AVEPOINT INCAVPTCOM$6,406,975571,541SHNone
ADVANCED DRAIN SYS INC DELWMSCOM$6,343,22440,413SHNone
SEMTECH CORPSMTCCOM$6,186,87838,226SHNone
OCEANEERING INTL INCOIICOM$6,137,281151,463SHNone
EVERUS CONSTR GROUPECGCOM$6,036,76336,377SHNone
AGNICO EAGLE MINES LTDAEMCOM$5,966,61038,462SHNone
LIQUIDIA CORPORATIONLQDACOM$5,959,25974,743SHNone
WILLDAN GROUP INCWLDNCOM$5,923,79974,890SHNone
FREQUENCY ELECTRS INCFEIMCOM$5,908,00389,043SHNone
MICROSOFT CORPMSFTCOM$5,861,63615,714SHNone
MAMAS CREATIONS INCMAMACOM$5,835,843326,938SHNone
XERIS BIOPHARMA HOLDINGS INCXERSCOM$5,667,615715,608SHNone
PARK AEROSPACE CORPPKECOM$5,482,180143,663SHNone
BIODESIX INCBDSXCOM$5,455,183241,915SHNone
XOMETRY INCXMTRCOM$5,397,30255,919SHNone
BLUELINX HLDGS INCBXCCOM$5,358,37586,593SHNone
MITEK SYS INCMITKCOM$5,312,569263,913SHNone
CREXENDO INCCXDOCOM$5,310,229710,874SHNone

Largest 50 positions by reported value; the filing may contain more positions.

How amendments affect these holdings

This view uses 1 effective filing version(s). A restatement replaces the previous book; a new-holdings amendment adds positions. 9 positions lack a resolved ticker and 0 positions are put or call entries.

A 13F is a delayed quarterly snapshot of disclosed holdings. It is not a complete trade ledger and does not reveal every position in a manager's portfolio. Option values refer to the reported underlying position rather than a traded option premium.

Quarter end and public filing date

Use the filing's public availability date when constructing a historical observation. The quarter-end report period is earlier and cannot be substituted for when the public learned the holdings.