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Super Investors ESSEX INVESTMENT MANAGEMENT CO LLC
EI

ESSEX INVESTMENT MANAGEMENT CO LLC

Quarterly 13F snapshot: US-listed longs only, no performance figures — 13F data cannot support them.

Portfolio value
$675M
Positions
301
Quarter ended
September 30, 2026
Filed
October 19, 2026

Reported portfolio value by quarter (54 quarters reported)

$873M $479M
Q2 13 Q1 16 Q4 18 Q3 21 Q2 24 Q3 26

$567M in Q2 2013 → $675M now. Hover for any quarter.

Holdings

As reported for the quarter ended September 30, 2026. Activity is the change in share count since the prior quarter's filing.

Holding % of portfolio Activity Shares Value
Tower Semiconductor Ltd 3.1% Trimmed 13% 91,519 $20.8M
KP Kiniksa Pharmaceuticals Intl P 2.2% Trimmed 16% 202,021 $15.1M
Ligand Pharmaceuticals Inc 1.8% Trimmed 11% 38,917 $12.2M
Adaptive Biotechnologies Corp 1.7% Trimmed 15% 401,735 $11.6M
Apple Inc 1.5% Trimmed 4.1% 31,084 $10.4M
Ceco Environmental Corp 1.5% Trimmed 3.1% 145,717 $10.1M
Hci Group Inc 1.4% Trimmed 3.5% 54,282 $9.44M
Leonardo Drs Inc 1.3% Trimmed 3.1% 242,479 $8.88M
Mirum Pharmaceuticals Inc 1.3% Trimmed 3.7% 101,716 $8.69M
Cohu Inc 1.3% Trimmed 3.0% 127,180 $8.67M
Avepoint Inc 1.2% Trimmed 3.4% 551,987 $7.77M
Sterling Infrastructure Inc 1.1% Trimmed 3.8% 15,536 $7.64M
Travere Therapeutics Inc 1.1% Trimmed 3.3% 129,493 $7.62M
Brainsway Ltd 1.1% Trimmed 3.0% 574,818 $7.59M
Ge Vernova Inc 1.1% Trimmed 3.7% 7,978 $7.58M
Nuvation Bio Inc 1.1% Added 100% 1,344,871 $7.53M
Werner Enterprises Inc 1.1% Trimmed 4.8% 220,515 $7.49M
Microsoft Corp 1.1% Trimmed 7.9% 14,469 $7.42M
FE Frequency Electrs Inc 1.1% Trimmed 3.1% 86,267 $7.29M
Biodesix Inc 1.0% Trimmed 3.0% 234,542 $7M
Agnico Eagle Mines Ltd 1.0% Trimmed 3.3% 37,195 $6.82M
Novocure Ltd 1.0% Trimmed 3.5% 424,133 $6.76M
Xeris Biopharma Holdings Inc 1.0% Trimmed 3.1% 693,260 $6.63M
Semtech Corp 1.0% Trimmed 3.1% 37,026 $6.6M
Marvell Technology Inc 1.0% Trimmed 4.1% 24,845 $6.56M
Graham Corp 1.0% Trimmed 19% 75,219 $6.49M
Amazon Com Inc 1.0% Trimmed 4.4% 25,879 $6.45M
Lantronix Inc 1.0% Added 34% 889,983 $6.42M
OI Oceaneering Intl Inc 0.9% Trimmed 3.3% 146,483 $6.39M
Goldman Sachs Group Inc 0.9% Trimmed 5.9% 7,069 $6.36M
Arteris Inc 0.9% Trimmed 3.1% 268,987 $6.36M
KD Kratos Defense & Sec Solutions 0.9% Trimmed 3.5% 148,246 $6.33M
Ouster Inc 0.9% Trimmed 32% 152,925 $6.17M
AH Asml Hldg Nv 0.9% Trimmed 4.1% 3,394 $6.15M
LE Lincoln Edl Svcs Corp 0.9% Trimmed 18% 278,205 $6.08M
American Superconductor Corp 0.9% Trimmed 7.5% 205,382 $5.98M
BH Bluelinx Hldgs Inc 0.9% Trimmed 3.0% 83,955 $5.97M
LI Lsi Inds Inc Ohio 0.9% Trimmed 2.8% 287,681 $5.97M
Riskified Ltd 0.9% Trimmed 3.1% 745,621 $5.9M
Precigen Inc 0.9% Trimmed 3.2% 683,419 $5.85M
Argan Inc 0.8% Trimmed 2.9% 15,016 $5.68M
908 Devices Inc 0.8% Trimmed 3.1% 455,706 $5.62M
Xometry Inc 0.8% Trimmed 3.1% 54,162 $5.57M
Sophia Genetics Sa 0.8% Trimmed 3.1% 643,129 $5.39M
Ambarella Inc 0.8% Trimmed 3.4% 77,245 $5.37M
Willdan Group Inc 0.8% Trimmed 3.1% 72,557 $5.36M
PI Patrick Inds Inc 0.8% Trimmed 4.8% 78,964 $5.35M
Gentherm Inc 0.8% Added 47% 158,243 $5.27M
Mistras Group Inc 0.8% Trimmed 3.1% 249,209 $5.25M
Forum Energy Technologies Inc 0.8% Trimmed 3.1% 64,563 $5.23M
Red Violet Inc 0.7% Trimmed 23% 63,732 $5.04M
AD Advanced Drain Sys Inc Del 0.7% Trimmed 3.0% 39,200 $4.97M
Si Bone Inc 0.7% Trimmed 3.1% 263,101 $4.95M
CG Concentra Group Holdings Paren 0.7% Trimmed 4.5% 142,065 $4.89M
Jazz Pharmaceuticals PLC 0.7% Trimmed 3.9% 20,819 $4.82M
Insmed Inc 0.7% Trimmed 3.5% 41,471 $4.73M
Diodes Inc 0.6% Trimmed 3.2% 45,241 $4.38M
MS Mitek Sys Inc 0.6% Trimmed 3.1% 255,853 $4.36M
IS Information Svcs Group Inc 0.6% Trimmed 3.1% 783,636 $4.33M
CM Columbus Mckinnon Corp N Y 0.6% Trimmed 3.1% 269,821 $4.3M

Showing top 60 of 301 positions.

Timeline of changes

What changed each quarter, from the filings' own share counts. Largest moves first; most recent 8 quarters.

Q3 2026

quarter ended September 30, 2026 · filed October 19, 2026

Company Action Shares changed Value of change % of portfolio
Crexendo Inc Exited −710,874 −$5.31M —
Watts Water Technologies Inc Added +11,980 +$4.24M 0.6%
Alpha Cognition Inc New +422,858 +$3.81M 0.6%
Nuvation Bio Inc Added +673,830 +$3.77M 1.1%
Nvidia Corporation New +16,210 +$3.7M 0.5%
Lgi Homes Inc New +78,553 +$3.66M 0.5%
IS Innovative Solutions & Support New +184,874 +$3.43M 0.5%
Fennec Pharmaceuticals Inc New +318,771 +$3.39M 0.5%
Octave Specialty Group Inc Exited −539,289 −$3.37M —
OF Oceanfirst Finl Corp New +198,887 +$3.29M 0.5%

Showing the 10 largest of 207 changes.

Q2 2026

quarter ended June 30, 2026 · filed August 06, 2026

Company Action Shares changed Value of change % of portfolio
Sterling Infrastructure Inc Trimmed −15,902 −$13.3M 1.8%
Globalstar Inc Exited −165,665 −$11M —
Werner Enterprises Inc New +231,625 +$10.1M 1.3%
PS Primoris Svcs Corp Exited −48,177 −$6.89M —
Bioventus Inc Exited −603,258 −$5.51M —
Xometry Inc New +55,919 +$5.4M 0.7%
BH Bluelinx Hldgs Inc New +86,593 +$5.36M 0.7%
Ligand Pharmaceuticals Inc Trimmed −14,893 −$4.71M 1.8%
Syndax Pharmaceuticals Inc Exited −198,985 −$4.65M —
Cohu Inc Trimmed −60,715 −$4.49M 1.3%

Showing the 10 largest of 238 changes.

Q1 2026

quarter ended March 31, 2026 · filed May 11, 2026

Company Action Shares changed Value of change % of portfolio
Tower Semiconductor Ltd Trimmed −76,695 −$13.5M 3.2%
Beta Bionics Inc Exited −217,796 −$6.64M —
Argan Inc Trimmed −11,530 −$6.28M 1.4%
UI Universal Ins Hldgs Inc Exited −177,374 −$6M —
Sterling Infrastructure Inc Trimmed −12,628 −$5.14M 2.1%
Novocure Ltd New +452,370 +$4.93M 0.8%
Syndax Pharmaceuticals Inc New +198,985 +$4.65M 0.7%
Angiodynamics Inc Exited −360,544 −$4.63M —
WI Winnebago Inds Inc Exited −109,490 −$4.44M —
Brainsway Ltd Added +314,373 +$4.18M 1.3%

Showing the 10 largest of 226 changes.

Q4 2025

quarter ended December 31, 2025 · filed February 13, 2026

Company Action Shares changed Value of change % of portfolio
Exzeo Group Inc New +291,076 +$7.06M 1.1%
Clearpoint Neuro Inc Exited −232,458 −$5.07M —
E Enviri Corp Exited −352,360 −$4.47M —
WI Winnebago Inds Inc New +109,490 +$4.44M 0.7%
Penguin Solutions Inc Exited −168,126 −$4.42M —
Insmed Inc Trimmed −24,654 −$4.29M 1.7%
KD Kratos Defense & Sec Solutions Trimmed −53,861 −$4.09M 2.2%
Sunopta Inc Exited −695,206 −$4.07M —
Gentherm Inc New +111,037 +$4.04M 0.6%
Onespan Inc Exited −227,628 −$3.62M —

Showing the 10 largest of 214 changes.

Q3 2025

quarter ended September 30, 2025 · filed November 06, 2025

Company Action Shares changed Value of change % of portfolio
KD Kratos Defense & Sec Solutions Trimmed −106,297 −$9.71M 3.4%
Globalstar Inc New +194,343 +$7.07M 1.1%
American Superconductor Corp Trimmed −100,461 −$5.97M 2.2%
Blueprint Medicines Corp Exited −36,291 −$4.65M —
AD Advanced Drain Sys Inc Del Added +33,274 +$4.62M 0.9%
Nextera Energy Inc Trimmed −60,004 −$4.53M 0.2%
Beta Bionics Inc New +222,615 +$4.42M 0.7%
Penguin Solutions Inc New +168,126 +$4.42M 0.7%
Nutex Health Inc Exited −32,403 −$4.03M —
Travere Therapeutics Inc New +161,988 +$3.87M 0.6%

Showing the 10 largest of 210 changes.

Q2 2025

quarter ended June 30, 2025 · filed August 12, 2025

Company Action Shares changed Value of change % of portfolio
Nutex Health Inc Trimmed −54,820 −$6.82M 0.7%
IT Intra-cellular Therapies Inc Exited −49,717 −$6.56M —
Mirum Pharmaceuticals Inc New +112,731 +$5.74M 1.0%
Travere Therapeutics Inc Exited −254,666 −$4.56M —
GH Generac Hldgs Inc Exited −30,615 −$3.88M —
Ge Vernova Inc Added +7,010 +$3.71M 1.4%
Guidewire Software Inc Trimmed −15,566 −$3.67M 1.0%
BM Bank Marin Bancorp Exited −132,943 −$2.93M —
Pfizer Inc Exited −114,116 −$2.89M —
Interface Inc Exited −142,578 −$2.83M —

Showing the 10 largest of 229 changes.

Q1 2025

quarter ended March 31, 2025 · filed May 07, 2025

Company Action Shares changed Value of change % of portfolio
PS Primoris Svcs Corp Trimmed −83,700 −$4.81M 0.8%
Bp PLC Trimmed −141,757 −$4.79M —
Travere Therapeutics Inc New +254,666 +$4.56M 1.0%
Turtle Beach Corp Exited −204,961 −$3.55M —
Avita Medical Inc Exited −261,171 −$3.34M —
Exxon Mobil Corp Trimmed −27,023 −$3.21M —
RR Range Res Corp Added +77,156 +$3.08M 0.7%
Baker Hughes Company New +68,515 +$3.01M 0.6%
BM Bank Marin Bancorp New +132,943 +$2.93M 0.6%
Penguin Solutions Inc New +163,573 +$2.84M 0.6%

Showing the 10 largest of 244 changes.

Q4 2024

quarter ended December 31, 2024 · filed February 07, 2025

Company Action Shares changed Value of change % of portfolio
Idex Corp Added +23,819 +$4.99M 0.9%
Leonardo Drs Inc Trimmed −117,435 −$3.79M 1.5%
GD Grid Dynamics Hldgs Inc New +139,676 +$3.11M 0.6%
DS Delcath Sys Inc Exited −336,722 −$3.04M —
Xylem Inc Trimmed −26,003 −$3.02M 0.5%
Quidelortho Corp New +63,797 +$2.84M 0.5%
Radcom Ltd New +229,133 +$2.83M 0.5%
Zeta Global Holdings Corp Trimmed −150,455 −$2.71M 0.5%
BD Bancorp Inc Del Exited −49,783 −$2.66M —
Extreme Networks New +155,261 +$2.6M 0.5%

Showing the 10 largest of 244 changes.

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