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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
$763M
Positions
306
Quarter ended
June 30, 2026
Filed
August 06, 2026

Reported portfolio value by quarter (53 quarters reported)

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

$567M in Q2 2013 → $763M now. Hover for any quarter.

Holdings

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

Holding % of portfolio Activity Shares Value
Tower Semiconductor Ltd 3.6% Trimmed 9.0% 105,543 $27.5M
LE Lincoln Edl Svcs Corp 2.2% Trimmed 4.2% 340,366 $17M
KP Kiniksa Pharmaceuticals Intl P 2.0% Trimmed 3.2% 241,382 $15.4M
Ouster Inc 1.9% Added 22% 226,028 $14.1M
Ligand Pharmaceuticals Inc 1.8% Trimmed 25% 43,567 $13.8M
Ceco Environmental Corp 1.8% Trimmed 4.3% 150,416 $13.6M
Sterling Infrastructure Inc 1.8% Trimmed 50% 16,155 $13.6M
Arteris Inc 1.8% Trimmed 4.4% 277,665 $13.5M
Mirum Pharmaceuticals Inc 1.6% Trimmed 2.5% 105,669 $12.4M
Argan Inc 1.6% Trimmed 3.9% 15,467 $12.4M
Graham Corp 1.5% Trimmed 27% 93,405 $11.6M
Leonardo Drs Inc 1.4% Trimmed 4.3% 250,215 $10.7M
Adaptive Biotechnologies Corp 1.3% Trimmed 4.2% 472,763 $10.1M
Werner Enterprises Inc 1.3% New 231,625 $10.1M
Hci Group Inc 1.3% Trimmed 2.4% 56,260 $9.86M
Ge Vernova Inc 1.3% Trimmed 0.4% 8,283 $9.73M
Cohu Inc 1.3% Trimmed 32% 131,170 $9.69M
Apple Inc 1.2% Trimmed 0.5% 32,427 $9.38M
AS American Superconductor Corp 1.2% Trimmed 2.5% 221,933 $9.21M
Brainsway Ltd 1.2% Trimmed 4.2% 592,606 $9.19M
TT Tetra Technologies Inc Del 1.1% Trimmed 4.3% 741,007 $8.4M
LI Lsi Inds Inc Ohio 1.0% Added 7.9% 295,820 $7.86M
Marvell Technology Inc 1.0% Trimmed 28% 25,911 $7.72M
KD Kratos Defense & Sec Solutions 1.0% Trimmed 3.3% 153,576 $7.66M
Travere Therapeutics Inc 1.0% Trimmed 17% 133,866 $7.6M
Goldman Sachs Group Inc 1.0% Trimmed 0.6% 7,513 $7.6M
PI Patrick Inds Inc 1.0% Added 79% 82,960 $7.45M
OG Orion Group Hldgs Inc 1.0% Trimmed 4.2% 442,603 $7.44M
AH Asml Hldg Nv 0.9% Trimmed 0.5% 3,538 $7.04M
Ambarella Inc 0.9% Trimmed 2.9% 79,997 $6.86M
Novocure Ltd 0.9% Trimmed 2.8% 439,648 $6.66M
Amazon Com Inc 0.8% Trimmed 0.5% 27,062 $6.45M
Avepoint Inc 0.8% Added 15% 571,541 $6.41M
AD Advanced Drain Sys Inc Del 0.8% Trimmed 0.4% 40,413 $6.34M
Semtech Corp 0.8% Trimmed 25% 38,226 $6.19M
OI Oceaneering Intl Inc 0.8% Trimmed 4.4% 151,463 $6.14M
EC Everus Constr Group 0.8% Trimmed 4.5% 36,377 $6.04M
Agnico Eagle Mines Ltd 0.8% Trimmed 0.5% 38,462 $5.97M
Liquidia Corporation 0.8% Trimmed 4.4% 74,743 $5.96M
Willdan Group Inc 0.8% Trimmed 4.3% 74,890 $5.92M
FE Frequency Electrs Inc 0.8% Trimmed 4.3% 89,043 $5.91M
Microsoft Corp 0.8% Trimmed 0.5% 15,714 $5.86M
MC Mamas Creations Inc 0.8% Trimmed 4.3% 326,938 $5.84M
Xeris Biopharma Holdings Inc 0.7% Trimmed 4.3% 715,608 $5.67M
Park Aerospace Corp 0.7% Trimmed 4.2% 143,663 $5.48M
Biodesix Inc 0.7% Added 83% 241,915 $5.46M
Xometry Inc 0.7% New 55,919 $5.4M
BH Bluelinx Hldgs Inc 0.7% New 86,593 $5.36M
MS Mitek Sys Inc 0.7% Trimmed 4.2% 263,913 $5.31M
Crexendo Inc 0.7% Trimmed 4.3% 710,874 $5.31M
Mirion Technologies Inc 0.7% Trimmed 4.5% 295,060 $5.29M
Red Violet Inc 0.7% Added 35% 82,555 $5.26M
Jazz Pharmaceuticals PLC 0.7% Trimmed 0.5% 21,665 $5.22M
D Diodes Inc 0.7% Trimmed 4.4% 46,732 $5.11M
Apyx Medical Corporation 0.7% Added 26% 1,136,630 $5.1M
Bwx Technologies Inc 0.6% Trimmed 0.5% 25,431 $4.95M
Ocular Therapeutix Inc 0.6% Added 23% 482,154 $4.73M
SF Sprouts Fmrs Mkt Inc 0.6% Added 430% 55,176 $4.67M
Lightpath Technologies Inc 0.6% Added 32% 285,052 $4.66M
Insmed Inc 0.6% Trimmed 31% 42,991 $4.58M

Showing top 60 of 306 positions.

Timeline of changes

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

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
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%
AS 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.

Q3 2024

quarter ended September 30, 2024 · filed October 10, 2024

Company Action Shares changed Value of change % of portfolio
Dynavax Technologies Corp Exited −419,191 −$4.71M
Pfizer Inc New +150,992 +$4.37M 0.8%
Crexendo Inc Added +776,102 +$3.6M 0.7%
Tarsus Pharmaceuticals Inc New +109,156 +$3.59M 0.6%
Talkspace Inc Exited −1,547,721 −$3.56M
Blueprint Medicines Corp New +35,461 +$3.28M 0.6%
Petiq Inc Exited −148,109 −$3.27M
AH Alphatec Hldgs Inc Exited −312,651 −$3.27M
Apple Inc Trimmed −12,865 −$3M 1.7%
AS Amer Software Inc New +266,295 +$2.98M 0.5%

Showing the 10 largest of 209 changes.

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