Filed: 5/11/2026ACC: 0000201772-26-000004
📋 What this filing means
ESSEX INVESTMENT MANAGEMENT CO LLC filed this quarterly 13F‑HR report disclosing 305 equity positions with a total reported market value of $631.74M. This filing provides a transparent view of the manager's long equity holdings as of the quarter end.
305
Positions
$631.74M
Total AUM (reported)
33.09M
Total Shares
Allocation by class
COM$616.53M97.6%
ADR$14.06M2.2%
ETF$1.15M0.2%
Portfolio Concentration
Top 3$47.85M7.6%
4–10$77.89M12.3%
11–25$116.58M18.5%
Rest$389.41M61.6%
Top 3 weight
7.6%
Top 10 weight
19.9%
Voting Authority Distribution
Total shares with voting rights: 33.09M
Sole
Full voting authority
19.54M
shares
% of voting shares59.0%
Shared
Joint voting authority
0.00
shares
% of voting shares0.0%
None
No voting authority
13.56M
shares
% of voting shares41.0%
Investment Discretion (by position count)
Sole305
Shared0
Other0
Dominant voting typeSole · 59.0% of voting shares
Institutional Holdings305
Rows:
TOWER SEMICONDUCTOR LTD
SOLEShares115.93K
TypeSH
Market value$20.34M
3.22%
Sole
86.80K
Shared
0.00
None
29.13K
LINCOLN EDL SVCS CORP
SOLEShares355.30K
TypeSH
Market value$14.45M
2.29%
Sole
186.63K
Shared
0.00
None
168.68K
STERLING INFRASTRUCTURE INC
SOLEShares32.06K
TypeSH
Market value$13.06M
2.07%
Sole
22.39K
Shared
0.00
None
9.67K
KINIKSA PHARMACEUTICALS INTL P
SOLEShares249.28K
TypeSH
Market value$12.00M
1.90%
Sole
163.69K
Shared
0.00
None
85.59K
LIGAND PHARMACEUTICALS INC
SOLEShares58.46K
TypeSH
Market value$11.67M
1.85%
Sole
43.77K
Shared
0.00
None
14.69K
LEONARDO DRS INC
SOLEShares261.45K
TypeSH
Market value$11.64M
1.84%
Sole
137.39K
Shared
0.00
None
124.06K
KRATOS DEFENSE & SEC SOLUTIONS
SOLEShares158.84K
TypeSH
Market value$11.20M
1.77%
Sole
101.45K
Shared
0.00
None
57.39K
GLOBALSTAR INC
SOLEShares165.66K
TypeSH
Market value$11.00M
1.74%
Sole
108.74K
Shared
0.00
None
56.92K
INSMED INC
SOLEShares62.68K
TypeSH
Market value$10.25M
1.62%
Sole
36.12K
Shared
0.00
None
26.56K
GRAHAM CORP
SOLEShares128.29K
TypeSH
Market value$10.12M
1.60%
Sole
67.16K
Shared
0.00
None
61.13K
MIRUM PHARMACEUTICALS INC
SOLEShares108.34K
TypeSH
Market value$10.01M
1.58%
Sole
80.30K
Shared
0.00
None
28.03K
CECO ENVIRONMENTAL CORP
SOLEShares157.25K
TypeSH
Market value$9.37M
1.48%
Sole
81.88K
Shared
0.00
None
75.36K
HCI GROUP INC
SOLEShares57.63K
TypeSH
Market value$8.91M
1.41%
Sole
43.39K
Shared
0.00
None
14.24K
ARGAN INC
SOLEShares16.10K
TypeSH
Market value$8.77M
1.39%
Sole
8.44K
Shared
0.00
None
7.66K
APPLE INC
SOLEShares32.58K
TypeSH
Market value$8.27M
1.31%
Sole
31.79K
Shared
0.00
None
789.00
BRAINSWAY LTD
SOLEShares618.55K
TypeSH
Market value$8.22M
1.30%
Sole
333.28K
Shared
0.00
None
285.27K
AGNICO EAGLE MINES LTD
SOLEShares38.64K
TypeSH
Market value$7.84M
1.24%
Sole
38.14K
Shared
0.00
None
501.00
AMERICAN SUPERCONDUCTOR CORP
SOLEShares227.56K
TypeSH
Market value$7.70M
1.22%
Sole
164.79K
Shared
0.00
None
62.76K
AMPRIUS TECHNOLOGIES INC
SOLEShares445.44K
TypeSH
Market value$7.51M
1.19%
Sole
258.56K
Shared
0.00
None
186.88K
GE VERNOVA INC
SOLEShares8.32K
TypeSH
Market value$7.26M
1.15%
Sole
8.13K
Shared
0.00
None
184.00
PRIMORIS SVCS CORP
SOLEShares48.18K
TypeSH
Market value$6.89M
1.09%
Sole
47.15K
Shared
0.00
None
1.03K
ADAPTIVE BIOTECHNOLOGIES CORP
SOLEShares493.40K
TypeSH
Market value$6.85M
1.08%
Sole
260.93K
Shared
0.00
None
232.47K
TETRA TECHNOLOGIES INC DEL
SOLEShares774.10K
TypeSH
Market value$6.60M
1.04%
Sole
404.33K
Shared
0.00
None
369.77K
GOLDMAN SACHS GROUP INC
SOLEShares7.56K
TypeSH
Market value$6.39M
1.01%
Sole
7.35K
Shared
0.00
None
208.00
WILLDAN GROUP INC
SOLEShares78.29K
TypeSH
Market value$5.99M
0.95%
Sole
40.89K
Shared
0.00
None
37.40K
| Issuer | Class | Shares | Type | Value / Portfolio % | Voting — Sole | Shared | None |
|---|---|---|---|---|---|---|---|
TOWER SEMICONDUCTOR LTDSOLE | COM | 115.93K | SH | $20.34M 3.22% | 86.80K | 0.00 | 29.13K |
LINCOLN EDL SVCS CORPSOLE | COM | 355.30K | SH | $14.45M 2.29% | 186.63K | 0.00 | 168.68K |
STERLING INFRASTRUCTURE INCSOLE | COM | 32.06K | SH | $13.06M 2.07% | 22.39K | 0.00 | 9.67K |
KINIKSA PHARMACEUTICALS INTL PSOLE | COM | 249.28K | SH | $12.00M 1.90% | 163.69K | 0.00 | 85.59K |
LIGAND PHARMACEUTICALS INCSOLE | COM | 58.46K | SH | $11.67M 1.85% | 43.77K | 0.00 | 14.69K |
LEONARDO DRS INCSOLE | COM | 261.45K | SH | $11.64M 1.84% | 137.39K | 0.00 | 124.06K |
KRATOS DEFENSE & SEC SOLUTIONSSOLE | COM | 158.84K | SH | $11.20M 1.77% | 101.45K | 0.00 | 57.39K |
GLOBALSTAR INCSOLE | COM | 165.66K | SH | $11.00M 1.74% | 108.74K | 0.00 | 56.92K |
INSMED INCSOLE | COM | 62.68K | SH | $10.25M 1.62% | 36.12K | 0.00 | 26.56K |
GRAHAM CORPSOLE | COM | 128.29K | SH | $10.12M 1.60% | 67.16K | 0.00 | 61.13K |
MIRUM PHARMACEUTICALS INCSOLE | COM | 108.34K | SH | $10.01M 1.58% | 80.30K | 0.00 | 28.03K |
CECO ENVIRONMENTAL CORPSOLE | COM | 157.25K | SH | $9.37M 1.48% | 81.88K | 0.00 | 75.36K |
HCI GROUP INCSOLE | COM | 57.63K | SH | $8.91M 1.41% | 43.39K | 0.00 | 14.24K |
ARGAN INCSOLE | COM | 16.10K | SH | $8.77M 1.39% | 8.44K | 0.00 | 7.66K |
APPLE INCSOLE | COM | 32.58K | SH | $8.27M 1.31% | 31.79K | 0.00 | 789.00 |
BRAINSWAY LTDSOLE | ADR | 618.55K | SH | $8.22M 1.30% | 333.28K | 0.00 | 285.27K |
AGNICO EAGLE MINES LTDSOLE | COM | 38.64K | SH | $7.84M 1.24% | 38.14K | 0.00 | 501.00 |
AMERICAN SUPERCONDUCTOR CORPSOLE | COM | 227.56K | SH | $7.70M 1.22% | 164.79K | 0.00 | 62.76K |
AMPRIUS TECHNOLOGIES INCSOLE | COM | 445.44K | SH | $7.51M 1.19% | 258.56K | 0.00 | 186.88K |
GE VERNOVA INCSOLE | COM | 8.32K | SH | $7.26M 1.15% | 8.13K | 0.00 | 184.00 |
PRIMORIS SVCS CORPSOLE | COM | 48.18K | SH | $6.89M 1.09% | 47.15K | 0.00 | 1.03K |
ADAPTIVE BIOTECHNOLOGIES CORPSOLE | COM | 493.40K | SH | $6.85M 1.08% | 260.93K | 0.00 | 232.47K |
TETRA TECHNOLOGIES INC DELSOLE | COM | 774.10K | SH | $6.60M 1.04% | 404.33K | 0.00 | 369.77K |
GOLDMAN SACHS GROUP INCSOLE | COM | 7.56K | SH | $6.39M 1.01% | 7.35K | 0.00 | 208.00 |
WILLDAN GROUP INCSOLE | COM | 78.29K | SH | $5.99M 0.95% | 40.89K | 0.00 | 37.40K |
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