ESSEX INVESTMENT MANAGEMENT CO LLC
Filing Date
Global Rank
#2,025
/ 8,232
▲ 97
Top Industry
Biotechnology
9.6%
3Y Alpha vs SPY
+3.9%
Period ended 2 months ago
Filed May 11, 2026 · 33d
25 quarters · since Mar 2020
Clone Performance
Jun 2023–Jun 2026 · vs SPYHypothetical growth of cloning every reported 13F position and rebalancing on each filing, indexed to the same start.
Cloned portfolio
+94.8%
SPY
+76.5%
Annualised alpha
+4.0%
Max drawdown
−25.2%
Estimate. 13F holdings are quarter-lagged and long-only, so the clone rebalances about 45 days after each period end — when the filing becomes public — and excludes options and short positions. Past performance does not predict future results.
Portfolio Concentration
295 positions · as of Mar 31, 2026 · Δ vs Dec 31, 2025Top Position
3.2%
−0.3 pts
Top 5
11.4%
+0.0 pts
Top 10
20.0%
+0.8 pts
HHI
98
Diversified+1
Portfolio Trend
25 quarters · across all stocks
Sector Breakdown
As of Mar 31, 2026| Sector | % Portfolio | Value |
|---|---|---|
| Industrials | 28.2% | $177,604,407 |
| Technology | 24.9% | $156,289,491 |
| Healthcare | 23.5% | $147,835,756 |
| Financial Services | 5.7% | $35,842,377 |
| Consumer Defensive | 4.6% | $29,190,367 |
| Communication Services | 4.0% | $24,983,305 |
| Consumer Cyclical | 3.5% | $22,009,888 |
| Energy | 2.9% | $18,268,300 |
| Basic Materials | 2.3% | $14,280,332 |
| Utilities | 0.4% | $2,551,074 |
| Unclassified | 0.0% | $52,535 |
Last Quarter's Activity
Export CSVAdded To
Positions the filer increased
25 positions
| Ticker | Company | Δ Shares | Shares | Value | Open |
|---|---|---|---|---|---|
| RPID | Rapid Micro Biosystems, Inc. | +821,605 | 883,931 | $2,006,523 | |
| CRGO | Freightos Ltd | +379,144 | 997,708 | $1,636,241 | |
| BWAY | Brainsway Ltd. | +314,373 | 618,553 | $8,220,569 | |
| IDN | Intellicheck, Inc. | +215,949 | 537,842 | $3,759,515 | |
| BVS | Bioventus Inc. | +215,372 | 603,258 | $5,507,745 | |
| LPTH | Lightpath Technologies Inc | +175,624 | 216,531 | $2,171,805 | |
| CODA | Coda Octopus Group, Inc. | +166,341 | 189,640 | $2,142,932 | |
| NMTC | NEUROONE MEDICAL TECHNOLOGIES Corp | +73,526 | 261,953 | $203,537 | |
| DCBO | Docebo Inc. | +71,364 | 172,367 | $3,011,251 | |
| OPTT | Ocean Power Technologies, Inc. | +30,579 | 205,193 | $71,817 | |
| STXS | Stereotaxis, Inc. | +28,082 | 1,590,101 | $2,925,785 | |
| TRT | Trio-Tech International | +15,737 | 31,474 | $181,919 | |
| TTI | Tetra Technologies Inc | +13,706 | 774,099 | $6,595,323 | |
| BLND | Blend Labs, Inc. | +13,316 | 762,290 | $1,295,893 | |
| XERS | Xeris Biopharma Holdings, Inc. | +13,237 | 747,769 | $4,337,060 | |
| CXDO | Crexendo, Inc. | +13,109 | 742,986 | $4,584,223 | |
| CCLD | CareCloud, Inc. | +12,932 | 697,836 | $2,547,101 | |
| INVE | Identiv, Inc. | +12,923 | 736,608 | $2,725,449 | |
| AMSC | American Superconductor Corp /De/ | +12,404 | 227,558 | $7,702,838 | |
| ORN | Orion Group Holdings Inc | +12,011 | 461,772 | $5,033,314 | |
| ENPH | Enphase Energy, Inc. | +11,305 | 35,440 | $1,339,986 | |
| CURI | CuriosityStream Inc. | +10,950 | 620,879 | $1,837,801 | |
| RVSB | Riverview Bancorp Inc | +10,316 | 390,295 | $2,146,622 | |
| LAW | CS Disco, Inc. | +9,534 | 539,314 | $2,060,179 | |
| MASS | 908 Devices Inc. | +8,607 | 491,221 | $3,006,272 | |
| No positions match the current search. | |||||
Trimmed
Positions the filer reduced
25 positions
| Ticker | Company | Δ Shares | Shares | Value | Open |
|---|---|---|---|---|---|
| ADPT | Adaptive Biotechnologies Corp | −130,814 | 493,403 | $6,848,433 | |
| TSEM | Tower Semiconductor Ltd | −76,695 | 115,933 | $20,343,922 | |
| AMPX | Amprius Technologies, Inc. | −71,324 | 445,441 | $7,510,135 | |
| OSS | One Stop Systems, Inc. | −33,822 | 35,534 | $268,992 | |
| LINC | Lincoln Educational Services Corp | −33,515 | 355,304 | $14,453,766 | |
| KTOS | Kratos Defense & Security Solutions, Inc. | −31,350 | 158,844 | $11,200,090 | |
| EVER | EverQuote, Inc. | −14,349 | 217,075 | $3,347,296 | |
| FLNC | Fluence Energy, Inc. | −12,982 | 25,576 | $351,925 | |
| STRL | Sterling Infrastructure, Inc. | −12,628 | 32,057 | $13,055,854 | |
| GHM | Graham Corp | −12,397 | 128,294 | $10,124,962 | |
| AGX | Argan Inc | −11,530 | 16,098 | $8,767,775 | |
| CON | Concentra Group Holdings Parent, Inc. | −11,020 | 149,625 | $3,209,456 | |
| AVPT | AvePoint, Inc. | −9,532 | 498,482 | $4,740,563 | |
| VZ | Verizon Communications Inc | −6,787 | 6,546 | $328,609 | |
| RFIL | R F Industries Ltd | −6,703 | 17,895 | $184,497 | |
| CGNX | Cognex Corp | −6,195 | 30,065 | $1,472,884 | |
| PAYX | Paychex Inc | −5,737 | 10,934 | $1,007,240 | |
| NEE | Nextera Energy Inc | −5,247 | 9,923 | $921,648 | |
| PEGA | Pegasystems Inc | −4,979 | 74,445 | $3,168,379 | |
| CL | Colgate Palmolive Co | −4,429 | 6,931 | $590,729 | |
| BKR | Baker Hughes Co | −4,010 | 54,682 | $3,338,336 | |
| B | Barrick Mining Corp | −3,923 | 22,975 | $937,150 | |
| IOT | Samsara Inc. | −3,818 | 33,164 | $1,050,967 | |
| KO | Coca Cola Co | −3,739 | 10,563 | $803,316 | |
| PG | PROCTER & GAMBLE Co | −3,567 | 5,865 | $847,140 | |
| No positions match the current search. | |||||
New Positions
Positions the filer opened this quarter
25 positions
| Ticker | Company | Shares | Value | Open |
|---|---|---|---|---|
| NVCR | NovoCure Ltd | 452,370 | $4,930,833 | |
| SNDX | Syndax Pharmaceuticals Inc | 198,985 | $4,648,289 | |
| MG | Mistras Group, Inc. | 268,567 | $3,969,420 | |
| MITK | Mitek Systems Inc | 275,602 | $3,720,627 | |
| MRVL | Marvell Technology, Inc. | 36,203 | $3,585,907 | |
| AGIO | Agios Pharmaceuticals, Inc. | 103,177 | $3,490,477 | |
| SOPH | SOPHiA GENETICS SA | 692,809 | $3,429,404 | |
| DIOD | Diodes Inc /Del/ | 48,869 | $3,335,797 | |
| APYX | Apyx Medical Corp | 901,398 | $3,326,158 | |
| RSKD | Riskified Ltd. | 803,032 | $3,147,885 | |
| LQDA | Liquidia Corp | 78,171 | $2,950,173 | |
| JOUT | Johnson Outdoors Inc | 62,864 | $2,923,804 | |
| BDSX | Biodesix Inc | 132,086 | $1,915,247 | |
| LGCY | Legacy Education Inc. | 143,439 | $1,795,856 | |
| LTRX | Lantronix Inc | 342,489 | $1,794,642 | |
| ALLT | Allot Ltd. | 226,056 | $1,505,532 | |
| SFM | Sprouts Farmers Market, Inc. | 10,403 | $802,383 | |
| LNN | Lindsay Corp | 5,927 | $705,727 | |
| MWH | SOLV Energy, Inc. | 17,808 | $534,774 | |
| AMBQ | Ambiq Micro, Inc. | 19,216 | $488,278 | |
| CVGI | Commercial Vehicle Group, Inc. | 59,834 | $204,033 | |
| HBIO | Harvard Bioscience Inc | 27,021 | $131,592 | |
| NTWK | Netsol Technologies Inc | 37,493 | $127,101 | |
| LVO | LiveOne, Inc. | 24,535 | $125,128 | |
| IFNNY | Infineon Technologies AG | 607 | $27,442 | |
| No positions match the current search. | ||||
Sold Out
Positions the filer fully exited
25 positions
| Ticker | Company | Shares | Value | Open |
|---|---|---|---|---|
| BBNX | Beta Bionics, Inc. | 217,796 | $6,636,244 | |
| UVE | Universal Insurance Holdings, Inc. | 177,374 | $5,995,241 | |
| ANGO | Angiodynamics Inc | 360,544 | $4,629,384 | |
| WGO | Winnebago Industries Inc | 109,490 | $4,436,534 | |
| MXL | Maxlinear, Inc | 235,595 | $4,106,420 | |
| GLDD | Great Lakes Dredge & Dock CORP | 301,986 | $3,962,056 | |
| RDCM | Radcom Ltd | 228,305 | $2,986,229 | |
| CRNT | Ceragon Networks Ltd | 1,391,697 | $2,922,563 | |
| DERM | Journey Medical Corp | 345,977 | $2,667,482 | |
| LZ | Legalzoom.Com, Inc. | 267,857 | $2,659,820 | |
| PROF | Profound Medical Corp. | 309,604 | $2,436,583 | |
| FSLR | First Solar, Inc. | 8,021 | $2,095,325 | |
| CTM | Castellum, Inc. | 2,114,029 | $1,908,968 | |
| PHR | Phreesia, Inc. | 102,423 | $1,732,997 | |
| SLND | Southland Holdings, Inc. | 475,723 | $1,579,400 | |
| BLDR | Builders FirstSource, Inc. | 13,482 | $1,387,162 | |
| PRLB | Proto Labs Inc | 15,504 | $784,347 | |
| DE | Deere & Co | 1,468 | $683,456 | |
| DFLI | Dragonfly Energy Holdings Corp. | 196,007 | $601,741 | |
| OWLT | Owlet, Inc. | 28,563 | $462,434 | |
| ARRY | Array Technologies, Inc. | 46,725 | $430,804 | |
| ACNT | Ascent Industries Co. | 12,041 | $194,943 | |
| AIRG | Airgain Inc | 19,398 | $78,755 | |
| LASE | Laser Photonics Corp | 27,361 | $67,581 | |
| SPY | Spdr S&P 500 ETF Trust | 85 | $57,963 | |
| No positions match the current search. | ||||
18 positions ·
$14,280,332 total
· Basic Materials only
· as of Mar 31, 2026
All sectors
Basic Materials
Communication Services
Consumer Cyclical
Consumer Defensive
Energy
Financial Services
Healthcare
Industrials
Technology
Utilities
| Ticker | Company | Type | Shares | Value (USD) | % of Portfolio | History |
|---|---|---|---|---|---|---|
| AEM |
Agnico Eagle Mines Ltd
Basic Materials
|
Reduced | 38,643 | $7,843,756 | 54.93% | |
| CTVA |
Corteva, Inc.
Basic Materials
|
Reduced | 18,668 | $1,562,698 | 10.94% | |
| B |
Barrick Mining Corp
Basic Materials
|
Reduced | 22,975 | $937,150 | 6.56% | |
| MLM |
Martin Marietta Materials Inc
Basic Materials
|
Held | 1,333 | $784,710 | 5.50% | |
| APD |
Air Products & Chemicals, Inc.
Basic Materials
|
Reduced | 2,567 | $745,687 | 5.22% | |
| FNV |
FRANCO NEVADA Corp
Basic Materials
|
Reduced | 2,995 | $739,914 | 5.18% | |
| WPM |
Wheaton Precious Metals Corp.
Basic Materials
|
Held | 4,906 | $642,735 | 4.50% | |
| NEM |
NEWMONT Corp /DE/
Basic Materials
|
Reduced | 4,053 | $438,737 | 3.07% | |
| FSI |
Flexible Solutions International Inc
Basic Materials
|
Held | 26,252 | $141,787 | 0.99% | |
| RGLD |
Royal Gold Inc
Basic Materials
|
Held | 338 | $86,017 | 0.60% | |
| KGC |
Kinross Gold Corp
Basic Materials
|
Held | 2,661 | $81,213 | 0.57% | |
| FCX |
Freeport-Mcmoran Inc
Basic Materials
|
Held | 1,297 | $76,237 | 0.53% | |
| RIO |
Rio Tinto PLC
Basic Materials
|
Added | 713 | $66,515 | 0.47% | |
| SNES |
SenesTech, Inc.
Basic Materials
|
Added | 26,294 | $43,122 | 0.30% | |
| AVNT |
Avient Corp
Basic Materials
|
Held | 915 | $33,214 | 0.23% | |
| DD |
DuPont de Nemours, Inc.
Basic Materials
|
Held | 715 | $32,747 | 0.23% | |
| ECL |
Ecolab Inc.
Basic Materials
|
Held | 83 | $22,079 | 0.15% | |
| LYB |
LyondellBasell Industries N.V.
Basic Materials
|
Held | 25 | $2,014 | 0.01% |