# ESSEX INVESTMENT MANAGEMENT CO LLC

> Institutional holdings reported to the SEC as of Q2 2026 on Form 13F. CIK 201772. Source: https://holderbook.com/funds/201772-essex-investment-management-co-llc/

- Reported value: $763.4M
- Positions: 306
- Weight of the ten largest: 20.1%
- Filed: 2026-08-06

A 13F reports long US equity positions only. Short positions, bonds, foreign listings, private holdings and cash are not visible, so this is not the manager's whole book.

## Holdings

| Security | Ticker | Value | Shares | Weight | Quarters held |
|---|---|---|---|---|---|
| TOWER SEMICONDUCTOR LTD | [TSEM](https://holderbook.com/stocks/TSEM/) | $27.5M | 105,543 | 3.6% | 10 |
| LINCOLN EDL SVCS CORP | [LINC](https://holderbook.com/stocks/LINC/) | $17.0M | 340,366 | 2.2% | 31 |
| KINIKSA PHARMACEUTICALS INTL | [KNSA](https://holderbook.com/stocks/KNSA/) | $15.4M | 241,382 | 2.0% | 9 |
| OUSTER INC | [OUST](https://holderbook.com/stocks/OUST/) | $14.1M | 226,028 | 1.9% | 10 |
| LIGAND PHARMACEUTICALS INC | [LGND](https://holderbook.com/stocks/LGND/) | $13.8M | 43,567 | 1.8% | 9 |
| CECO ENVIRONMENTAL CORP | [CECO](https://holderbook.com/stocks/CECO/) | $13.6M | 150,416 | 1.8% | 31 |
| STERLING INFRASTRUCTURE INC | [STRL](https://holderbook.com/stocks/STRL/) | $13.6M | 16,155 | 1.8% | 31 |
| ARTERIS INC | [AIP](https://holderbook.com/stocks/AIP/) | $13.5M | 277,665 | 1.8% | 8 |
| MIRUM PHARMACEUTICALS INC | [MIRM](https://holderbook.com/stocks/MIRM/) | $12.4M | 105,669 | 1.6% | 5 |
| ARGAN INC | [AGX](https://holderbook.com/stocks/AGX/) | $12.4M | 15,467 | 1.6% | 9 |
| GRAHAM CORP | [GHM](https://holderbook.com/stocks/GHM/) | $11.6M | 93,405 | 1.5% | 16 |
| LEONARDO DRS INC | [DRS](https://holderbook.com/stocks/DRS/) | $10.7M | 250,215 | 1.4% | 15 |
| ADAPTIVE BIOTECHNOLOGIES COR | [ADPT](https://holderbook.com/stocks/ADPT/) | $10.1M | 472,763 | 1.3% | 14 |
| WERNER ENTERPRISES INC | [WERN](https://holderbook.com/stocks/WERN/) | $10.1M | 231,625 | 1.3% | 1 |
| HCI GROUP INC | [HCI](https://holderbook.com/stocks/HCI/) | $9.9M | 56,260 | 1.3% | 31 |
| GE VERNOVA INC | [GEV](https://holderbook.com/stocks/GEV/) | $9.7M | 8,283 | 1.3% | 9 |
| COHU INC | [COHU](https://holderbook.com/stocks/COHU/) | $9.7M | 131,170 | 1.3% | 5 |
| APPLE INC | [AAPL](https://holderbook.com/stocks/AAPL/) | $9.4M | 32,427 | 1.2% | 31 |
| AMERICAN SUPERCONDUCTOR CORP | [AMSC](https://holderbook.com/stocks/AMSC/) | $9.2M | 221,933 | 1.2% | 12 |
| BRAINSWAY LTD | [BWAY](https://holderbook.com/stocks/BWAY/) | $9.2M | 592,606 | 1.2% | 11 |
| TETRA TECHNOLOGIES INC DEL | [TTI](https://holderbook.com/stocks/TTI/) | $8.4M | 741,007 | 1.1% | 17 |
| LSI INDS INC OHIO | [LYTS](https://holderbook.com/stocks/LYTS/) | $7.9M | 295,820 | 1.0% | 31 |
| MARVELL TECHNOLOGY INC | [MRVL](https://holderbook.com/stocks/MRVL/) | $7.7M | 25,911 | 1.0% | 2 |
| KRATOS DEFENSE & SEC SOLUTIO | [KTOS](https://holderbook.com/stocks/KTOS/) | $7.7M | 153,576 | 1.0% | 18 |
| TRAVERE THERAPEUTICS INC | [TVTX](https://holderbook.com/stocks/TVTX/) | $7.6M | 133,866 | 1.0% | 4 |
| GOLDMAN SACHS GROUP INC | [GS](https://holderbook.com/stocks/GS/) | $7.6M | 7,513 | 1.0% | 31 |
| PATRICK INDS INC | [PATK](https://holderbook.com/stocks/PATK/) | $7.4M | 82,960 | 1.0% | 31 |
| ORION GROUP HLDGS INC | [ORN](https://holderbook.com/stocks/ORN/) | $7.4M | 442,603 | 1.0% | 5 |
| ASML HLDG NV | [ASML](https://holderbook.com/stocks/ASML/) | $7.0M | 3,538 | 0.9% | 6 |
| AMBARELLA INC | [AMBA](https://holderbook.com/stocks/AMBA/) | $6.9M | 79,997 | 0.9% | 9 |
| NOVOCURE LTD | [NVCR](https://holderbook.com/stocks/NVCR/) | $6.7M | 439,648 | 0.9% | 2 |
| AMAZON COM INC | [AMZN](https://holderbook.com/stocks/AMZN/) | $6.4M | 27,062 | 0.8% | 31 |
| AVEPOINT INC | [AVPT](https://holderbook.com/stocks/AVPT/) | $6.4M | 571,541 | 0.8% | 10 |
| ADVANCED DRAIN SYS INC DEL | [WMS](https://holderbook.com/stocks/WMS/) | $6.3M | 40,413 | 0.8% | 8 |
| SEMTECH CORP | [SMTC](https://holderbook.com/stocks/SMTC/) | $6.2M | 38,226 | 0.8% | 6 |
| OCEANEERING INTL INC | [OII](https://holderbook.com/stocks/OII/) | $6.1M | 151,463 | 0.8% | 5 |
| EVERUS CONSTR GROUP | [ECG](https://holderbook.com/stocks/ECG/) | $6.0M | 36,377 | 0.8% | 7 |
| AGNICO EAGLE MINES LTD | [AEM](https://holderbook.com/stocks/AEM/) | $6.0M | 38,462 | 0.8% | 31 |
| LIQUIDIA CORPORATION | [LQDA](https://holderbook.com/stocks/LQDA/) | $6.0M | 74,743 | 0.8% | 2 |
| WILLDAN GROUP INC | [WLDN](https://holderbook.com/stocks/WLDN/) | $5.9M | 74,890 | 0.8% | 31 |
| FREQUENCY ELECTRS INC | [FEIM](https://holderbook.com/stocks/FEIM/) | $5.9M | 89,043 | 0.8% | 5 |
| MICROSOFT CORP | [MSFT](https://holderbook.com/stocks/MSFT/) | $5.9M | 15,714 | 0.8% | 31 |
| MAMAS CREATIONS INC | [MAMA](https://holderbook.com/stocks/MAMA/) | $5.8M | 326,938 | 0.8% | 5 |
| XERIS BIOPHARMA HOLDINGS INC | [XERS](https://holderbook.com/stocks/XERS/) | $5.7M | 715,608 | 0.7% | 7 |
| PARK AEROSPACE CORP | [PKE](https://holderbook.com/stocks/PKE/) | $5.5M | 143,663 | 0.7% | 4 |
| BIODESIX INC | [BDSX](https://holderbook.com/stocks/BDSX/) | $5.5M | 241,915 | 0.7% | 2 |
| XOMETRY INC | [XMTR](https://holderbook.com/stocks/XMTR/) | $5.4M | 55,919 | 0.7% | 1 |
| BLUELINX HLDGS INC | [BXC](https://holderbook.com/stocks/BXC/) | $5.4M | 86,593 | 0.7% | 1 |
| MITEK SYS INC | [MITK](https://holderbook.com/stocks/MITK/) | $5.3M | 263,913 | 0.7% | 2 |
| CREXENDO INC | [CXDO](https://holderbook.com/stocks/CXDO/) | $5.3M | 710,874 | 0.7% | 24 |
| MIRION TECHNOLOGIES INC | [MIR](https://holderbook.com/stocks/MIR/) | $5.3M | 295,060 | 0.7% | 12 |
| RED VIOLET INC | [RDVT](https://holderbook.com/stocks/RDVT/) | $5.3M | 82,555 | 0.7% | 9 |
| JAZZ PHARMACEUTICALS PLC | [JAZZ](https://holderbook.com/stocks/JAZZ/) | $5.2M | 21,665 | 0.7% | 4 |
| DIODES INC | [DIOD](https://holderbook.com/stocks/DIOD/) | $5.1M | 46,732 | 0.7% | 2 |
| APYX MEDICAL CORPORATION | [APYX](https://holderbook.com/stocks/APYX/) | $5.1M | 1,136,630 | 0.7% | 2 |
| BWX TECHNOLOGIES INC | [BWXT](https://holderbook.com/stocks/BWXT/) | $5.0M | 25,431 | 0.6% | 16 |
| OCULAR THERAPEUTIX INC | [OCUL](https://holderbook.com/stocks/OCUL/) | $4.7M | 482,154 | 0.6% | 11 |
| SPROUTS FMRS MKT INC | [SFM](https://holderbook.com/stocks/SFM/) | $4.7M | 55,176 | 0.6% | 2 |
| LIGHTPATH TECHNOLOGIES INC | [LPTH](https://holderbook.com/stocks/LPTH/) | $4.7M | 285,052 | 0.6% | 7 |
| INSMED INC | [INSM](https://holderbook.com/stocks/INSM/) | $4.6M | 42,991 | 0.6% | 16 |
| EXZEO GROUP INC | [XZO](https://holderbook.com/stocks/XZO/) | $4.5M | 268,704 | 0.6% | 3 |
| MISTRAS GROUP INC | [MG](https://holderbook.com/stocks/MG/) | $4.5M | 257,127 | 0.6% | 2 |
| SI-BONE INC | [SIBN](https://holderbook.com/stocks/SIBN/) | $4.4M | 271,404 | 0.6% | 8 |
| CONCENTRA GROUP HOLDINGS PAR | [CON](https://holderbook.com/stocks/CON/) | $4.4M | 148,836 | 0.6% | 7 |
| INTERFACE INC | [TILE](https://holderbook.com/stocks/TILE/) | $4.4M | 123,401 | 0.6% | 1 |
| GRIFFON CORP | [GFF](https://holderbook.com/stocks/GFF/) | $4.4M | 44,937 | 0.6% | 17 |
| JOHNSON OUTDOORS INC | [JOUT](https://holderbook.com/stocks/JOUT/) | $4.3M | 94,176 | 0.6% | 2 |
| DAKTRONICS INC | [DAKT](https://holderbook.com/stocks/DAKT/) | $4.2M | 216,428 | 0.6% | 3 |
| COLUMBUS MCKINNON CORP N Y | [CMCO](https://holderbook.com/stocks/CMCO/) | $4.2M | 278,316 | 0.6% | 3 |
| BADGER METER INC | [BMI](https://holderbook.com/stocks/BMI/) | $4.2M | 28,041 | 0.5% | 31 |
| 908 DEVICES INC | [MASS](https://holderbook.com/stocks/MASS/) | $4.1M | 470,244 | 0.5% | 6 |
| LIQUIDITY SVCS INC | [LQDT](https://holderbook.com/stocks/LQDT/) | $4.0M | 103,302 | 0.5% | 8 |
| PRECIGEN INC | [PGEN](https://holderbook.com/stocks/PGEN/) | $4.0M | 706,294 | 0.5% | 1 |
| AXSOME THERAPEUTICS INC | [AXSM](https://holderbook.com/stocks/AXSM/) | $4.0M | 16,244 | 0.5% | 4 |
| AMPRIUS TECHNOLOGIES INC | [AMPX](https://holderbook.com/stocks/AMPX/) | $3.9M | 284,595 | 0.5% | 6 |
| GLOBUS MED INC | [GMED](https://holderbook.com/stocks/GMED/) | $3.9M | 49,677 | 0.5% | 31 |
| LANTRONIX INC | [LTRX](https://holderbook.com/stocks/LTRX/) | $3.9M | 662,070 | 0.5% | 2 |
| LEGACY ED INC | [LGCY](https://holderbook.com/stocks/LGCY/) | $3.9M | 329,894 | 0.5% | 2 |
| RISKIFIED LTD | [RSKD](https://holderbook.com/stocks/RSKD/) | $3.9M | 769,085 | 0.5% | 2 |
| AMERANT BANCORP INC | [AMTB](https://holderbook.com/stocks/AMTB/) | $3.8M | 150,236 | 0.5% | 3 |
| SOPHIA GENETICS SA | [SOPH](https://holderbook.com/stocks/SOPH/) | $3.8M | 663,428 | 0.5% | 2 |
| NUVATION BIO INC | [NUVB](https://holderbook.com/stocks/NUVB/) | $3.8M | 671,041 | 0.5% | 1 |
| GENTHERM INC | [THRM](https://holderbook.com/stocks/THRM/) | $3.7M | 107,970 | 0.5% | 3 |
| BLACKSKY TECHNOLOGY INC | [BKSY](https://holderbook.com/stocks/BKSY/) | $3.6M | 130,281 | 0.5% | 5 |
| ARCUTIS BIOTHERAPEUTICS INC | [ARQT](https://holderbook.com/stocks/ARQT/) | $3.6M | 137,500 | 0.5% | 9 |
| DOLLAR TREE INC | [DLTR](https://holderbook.com/stocks/DLTR/) | $3.6M | 29,455 | 0.5% | 31 |
| BGC GROUP INC | [BGC](https://holderbook.com/stocks/BGC/) | $3.4M | 321,484 | 0.5% | 10 |
| OCTAVE SPECIALTY GROUP INC | [OSG](https://holderbook.com/stocks/OSG/) | $3.4M | 539,289 | 0.4% | 3 |
| FORUM ENERGY TECHNOLOGIES IN | [FET](https://holderbook.com/stocks/FET/) | $3.3M | 66,611 | 0.4% | 1 |
| INFORMATION SVCS GROUP INC | [III](https://holderbook.com/stocks/III/) | $3.3M | 808,345 | 0.4% | 3 |
| NEUROPACE INC | [NPCE](https://holderbook.com/stocks/NPCE/) | $3.3M | 208,703 | 0.4% | 6 |
| FREIGHTCAR AMER INC | [RAIL](https://holderbook.com/stocks/RAIL/) | $3.3M | 337,662 | 0.4% | 4 |
| NOVANTA INC | [NOVT](https://holderbook.com/stocks/NOVT/) | $3.2M | 19,811 | 0.4% | 31 |
| CROWDSTRIKE HLDGS INC | [CRWD](https://holderbook.com/stocks/CRWD/) | $3.2M | 4,169 | 0.4% | 1 |
| CODA OCTOPUS GROUP INC | [CODA](https://holderbook.com/stocks/CODA/) | $3.1M | 322,278 | 0.4% | 7 |
| BAKER HUGHES COMPANY | [BKR](https://holderbook.com/stocks/BKR/) | $3.0M | 54,375 | 0.4% | 6 |
| IBEX LTD | [IBEX](https://holderbook.com/stocks/IBEX/) | $3.0M | 98,156 | 0.4% | 6 |
| DOCEBO INC | [DCBO](https://holderbook.com/stocks/DCBO/) | $3.0M | 165,095 | 0.4% | 15 |
| EVERCORE INC | [EVR](https://holderbook.com/stocks/EVR/) | $2.9M | 8,573 | 0.4% | 31 |
| BRC INC | [BRCC](https://holderbook.com/stocks/BRCC/) | $2.9M | 2,624,990 | 0.4% | 1 |

## What the disclosed book did

Not the fund's return. This is the change in value of the positions disclosed on Form 13F, had they been left untouched, against SPY over the same quarter ends.

| Quarter | Book | Market | Difference | Priced |
|---|---|---|---|---|
| Q2 2026 | +25.7% | +14.8% | +10.9% | 100% |
| Q1 2026 | -0.1% | -4.6% | +4.5% | 100% |
| Q4 2025 | +1.8% | +2.4% | -0.6% | 100% |
| Q3 2025 | +19.3% | +7.8% | +11.5% | 99% |
| Q2 2025 | +20.3% | +10.5% | +9.8% | 100% |
| Q1 2025 | -10.4% | -4.6% | -5.9% | 100% |
| Q4 2024 | +5.4% | +2.1% | +3.2% | 100% |
| Q3 2024 | +9.5% | +5.4% | +4.1% | 100% |

## Quarter by quarter

| Quarter | Value | Positions |
|---|---|---|
| Q2 2026 | $763.4M | 306 |
| Q1 2026 | $631.7M | 305 |
| Q4 2025 | $655.9M | 306 |
| Q3 2025 | $653.4M | 299 |
| Q2 2025 | $550.0M | 298 |
| Q1 2025 | $479.4M | 303 |
| Q4 2024 | $556.1M | 307 |
| Q3 2024 | $573.7M | 302 |
| Q2 2024 | $534.7M | 302 |
| Q1 2024 | $506.7M | 306 |
| Q4 2023 | $507.9M | 315 |
| Q3 2023 | $612.7M | 356 |