2026 Q3 Portfolio Activity
In 2026 Q3, ESSEX INVESTMENT MANAGEMENT CO LLC maintained a portfolio of 326 distinct positions. The most significant new addition was ALPHA COGNITION INC, now representing 0.56% of the total fund value. They heavily accumulated shares in WATTS WATER TECHNOLOGIES INC, increasing the position by 239600.0%. The fund also reduced its exposure to OUSTER INC by 32.3%.
Position History
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Total Positions
326
Quarter
2026 Q3
Top Holding
TSEM (3.1%)
Top 10 Concentration
17.2%
Turnover Rate
23.4%
Sector HHI
0.18
Items per page:
Showing 1-50 of 326
ESSEX INVESTMENT MANAGEMENT CO LLC Full Holdings List — 2026 Q3
| Stock | History | Sector / Type | Port % | Prev % | Rank / Prev | Conviction | Change | % Change | Influence | Shares | Mkt Value | Avg Cost | Price Held | 1st Owned | Source | Source Date | Date Reported | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
TSEM
TOWER SEMICONDU...
|
Technology | 3.08% | 3.60% |
#1
Prev: #1
|
3.7 |
—
|
-14,024 | -13.3% |
P
S
|
91,519 | $20,814,166 |
$25.42
+687.9%
|
2014 Q3 | 13F Filing | 2026-09-30 | 2026-10-19 | ||
|
KNSA
KINIKSA PHARMAC...
|
Healthcare | 2.23% | 2.02% |
#2
1
Prev: #3
|
2.9 |
—
|
-39,361 | -16.3% |
P
S
|
202,021 | $15,072,787 |
$24.44
+240.3%
|
2024 Q2 | 13F Filing | 2026-09-30 | 2026-10-19 | ||
|
LGND
LIGAND PHARMACE...
|
Healthcare | 1.80% | 1.80% |
#3
2
Prev: #5
|
2.2 |
—
|
-4,650 | -10.7% |
P
S
|
38,917 | $12,156,503 |
$50.72
+486.2%
|
2012 Q4 | 13F Filing | 2026-09-30 | 2026-10-19 | ||
|
ADPT
ADAPTIVE BIOTEC...
|
Healthcare | 1.72% | 1.33% |
#4
9
Prev: #13
|
1.7 |
—
|
-71,028 | -15.0% |
P
S
|
401,735 | $11,610,142 | 2001 Q4 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
AAPL
APPLE INC
|
Technology | 1.53% | 1.23% |
#5
13
Prev: #18
|
1.6 |
—
|
-1,343 | -4.1% |
P
S
|
31,084 | $10,351,594 | 1999 Q2 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
CECO
CECO ENVIRONMEN...
|
Industrials | 1.50% | 1.79% |
#6
Prev: #6
|
1.1 |
—
|
-4,699 | -3.1% |
P
S
|
145,717 | $10,147,732 | 1999 Q1 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
HCI
HCI GROUP INC
|
Financial Services | 1.40% | 1.29% |
#7
8
Prev: #15
|
1.1 |
—
|
-1,978 | -3.5% |
P
S
|
54,282 | $9,435,297 | 2018 Q2 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
DRS
LEONARDO DRS IN...
|
Industrials | 1.32% | 1.40% |
#8
4
Prev: #12
|
1.0 |
—
|
-7,736 | -3.1% |
P
S
|
242,479 | $8,882,006 | 2022 Q4 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
MIRM
MIRUM PHARMACEU...
|
Healthcare | 1.29% | 1.62% |
#9
Prev: #9
|
1.0 |
—
|
-3,953 | -3.7% |
P
S
|
101,716 | $8,694,684 | 2025 Q2 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
COHU
COHU INC
|
Technology | 1.28% | 1.27% |
#10
7
Prev: #17
|
1.0 |
—
|
-3,990 | -3.0% |
P
S
|
127,180 | $8,666,045 | 2025 Q2 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
AVPT
AVEPOINT INC
|
Technology | 1.15% | 0.84% |
#11
22
Prev: #33
|
1.0 |
—
|
-19,554 | -3.4% |
P
S
|
551,987 | $7,771,977 | 2024 Q1 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
STRL
STERLING INFRAS...
|
Industrials | 1.13% | 1.78% |
#12
5
Prev: #7
|
1.0 |
—
|
-619 | -3.8% |
P
S
|
15,536 | $7,640,294 | 2015 Q3 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
TVTX
TRAVERE THERAPE...
|
Healthcare | 1.13% | 1.00% |
#13
12
Prev: #25
|
1.0 |
—
|
-4,373 | -3.3% |
P
S
|
129,493 | $7,624,548 | 2021 Q4 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
BWAY
BRAINSWAY LTD
|
Healthcare | 1.12% | 1.20% |
#14
6
Prev: #20
|
0.9 |
—
|
-17,788 | -3.0% |
P
S
|
574,818 | $7,587,598 | 2020 Q3 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
GEV
GE VERNOVA INC
|
Industrials | 1.12% | 1.27% |
#15
1
Prev: #16
|
0.9 |
—
|
-305 | -3.7% |
P
S
|
7,978 | $7,583,009 | 2024 Q2 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
NUVB
NUVATION BIO IN...
|
Healthcare | 1.12% | 0.50% |
#16
66
Prev: #82
|
3.4 |
—
|
673,830 | 100.4% |
P
S
|
1,344,871 | $7,531,278 | 2026 Q2 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
WERN
WERNER ENTERPRI...
|
Industrials | 1.11% | 1.32% |
#17
3
Prev: #14
|
0.9 |
—
|
-11,110 | -4.8% |
P
S
|
220,515 | $7,493,100 | 2002 Q2 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
MSFT
MICROSOFT CORP
|
Technology | 1.10% | 0.77% |
#18
24
Prev: #42
|
0.9 |
—
|
-1,245 | -7.9% |
P
S
|
14,469 | $7,421,150 | 1999 Q1 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
FEIM
FREQUENCY ELECT...
|
Technology | 1.08% | 0.77% |
#19
22
Prev: #41
|
0.9 |
—
|
-2,776 | -3.1% |
P
S
|
86,267 | $7,292,150 | 2020 Q3 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
BDSX
BIODESIX INC
|
Healthcare | 1.04% | 0.71% |
#20
26
Prev: #46
|
0.9 |
—
|
-7,373 | -3.0% |
P
S
|
234,542 | $6,996,388 | 2021 Q1 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
AEM
AGNICO EAGLE MI...
|
Basic Materials | 1.01% | 0.78% |
#21
17
Prev: #38
|
0.9 |
—
|
-1,267 | -3.3% |
P
S
|
37,195 | $6,816,728 | 2002 Q1 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
NVCR
NOVOCURE LTD
|
Healthcare | 1.00% | 0.87% |
#22
9
Prev: #31
|
0.9 |
—
|
-15,515 | -3.5% |
P
S
|
424,133 | $6,764,921 | 2017 Q3 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
XERS
XERIS BIOPHARMA...
|
Healthcare | 0.98% | 0.74% |
#23
21
Prev: #44
|
0.9 |
—
|
-22,348 | -3.1% |
P
S
|
693,260 | $6,627,566 | 2024 Q4 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
SMTC
SEMTECH CORP
|
Technology | 0.98% | 0.81% |
#24
11
Prev: #35
|
0.9 |
—
|
-1,200 | -3.1% |
P
S
|
37,026 | $6,603,587 | 1999 Q3 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
MRVL
MARVELL TECHNOL...
|
Technology | 0.97% | 1.01% |
#25
2
Prev: #23
|
0.9 |
—
|
-1,066 | -4.1% |
P
S
|
24,845 | $6,564,297 | 2001 Q4 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
GHM
GRAHAM CORP
|
Industrials | 0.96% | 1.51% |
#26
15
Prev: #11
|
0.9 |
—
|
-18,186 | -19.5% |
P
S
|
75,219 | $6,492,152 | 2018 Q3 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
AMZN
AMAZON COM INC
|
Consumer Cyclical | 0.96% | 0.84% |
#27
5
Prev: #32
|
0.9 |
—
|
-1,183 | -4.4% |
P
S
|
25,879 | $6,447,753 | 1999 Q1 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
LTRX
LANTRONIX INC
|
Technology | 0.95% | 0.51% |
#28
49
Prev: #77
|
2.9 |
—
|
227,913 | 34.4% |
P
S
|
889,983 | $6,416,777 | 2014 Q4 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
OII
OCEANEERING INT...
|
Energy | 0.95% | 0.80% |
#29
7
Prev: #36
|
0.9 |
—
|
-4,980 | -3.3% |
P
S
|
146,483 | $6,391,053 | 2005 Q4 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
GS
GOLDMAN SACHS G...
|
Financial Services | 0.94% | 1.00% |
#30
4
Prev: #26
|
0.9 |
—
|
-444 | -5.9% |
P
S
|
7,069 | $6,364,645 | 1999 Q2 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
AIP
ARTERIS INC
|
Technology | 0.94% | 1.77% |
#31
23
Prev: #8
|
0.9 |
—
|
-8,678 | -3.1% |
P
S
|
268,987 | $6,358,853 | 2024 Q3 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
KTOS
KRATOS DEFENSE ...
|
Industrials | 0.94% | 1.00% |
#32
8
Prev: #24
|
0.9 |
—
|
-5,330 | -3.5% |
P
S
|
148,246 | $6,328,622 | 2022 Q1 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
OUST
OUSTER INC
|
Technology | 0.91% | 1.85% |
#33
29
Prev: #4
|
0.4 |
—
|
-73,103 | -32.3% |
P
S
|
152,925 | $6,168,995 | 2024 Q1 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
ASML
ASML HLDG NV
|
Technology | 0.91% | 0.92% |
#34
5
Prev: #29
|
0.9 |
—
|
-144 | -4.1% |
P
S
|
3,394 | $6,148,808 | 1999 Q1 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
LINC
LINCOLN EDL SVC...
|
Consumer Defensive | 0.90% | 2.22% |
#35
33
Prev: #2
|
0.9 |
—
|
-62,161 | -18.3% |
P
S
|
278,205 | $6,084,343 | 2011 Q1 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
AMSC
AMERICAN SUPERC...
|
Industrials | 0.89% | 1.21% |
#36
17
Prev: #19
|
0.9 |
—
|
-16,551 | -7.5% |
P
S
|
205,382 | $5,978,670 | 2000 Q3 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
BXC
BLUELINX HLDGS ...
|
Industrials | 0.89% | 0.70% |
#37
11
Prev: #48
|
0.9 |
—
|
-2,638 | -3.0% |
P
S
|
83,955 | $5,971,719 | 2026 Q2 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
LYTS
LSI INDS INC OH...
|
Technology | 0.88% | 1.03% |
#38
16
Prev: #22
|
0.9 |
—
|
-8,139 | -2.8% |
P
S
|
287,681 | $5,969,381 | 2009 Q4 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
RSKD
RISKIFIED LTD
|
Technology | 0.87% | 0.51% |
#39
40
Prev: #79
|
0.8 |
—
|
-23,464 | -3.1% |
P
S
|
745,621 | $5,897,862 | 2026 Q1 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
PGEN
PRECIGEN INC
|
Healthcare | 0.87% | 0.53% |
#40
33
Prev: #73
|
0.8 |
—
|
-22,875 | -3.2% |
P
S
|
683,419 | $5,850,067 | 2026 Q2 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
AGX
ARGAN INC
|
Industrials | 0.84% | 1.62% |
#41
31
Prev: #10
|
0.8 |
—
|
-451 | -2.9% |
P
S
|
15,016 | $5,675,297 | 2023 Q4 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
MASS
908 DEVICES INC
|
Healthcare | 0.83% | 0.54% |
#42
29
Prev: #71
|
0.8 |
—
|
-14,538 | -3.1% |
P
S
|
455,706 | $5,623,412 | 2025 Q1 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
XMTR
XOMETRY INC
|
Industrials | 0.83% | 0.71% |
#43
4
Prev: #47
|
0.8 |
—
|
-1,757 | -3.1% |
P
S
|
54,162 | $5,570,562 | 2026 Q2 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
SOPH
SOPHIA GENETICS...
|
Healthcare | 0.80% | 0.50% |
#44
37
Prev: #81
|
0.8 |
—
|
-20,299 | -3.1% |
P
S
|
643,129 | $5,389,421 | 2023 Q4 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
AMBA
AMBARELLA INC
|
Technology | 0.80% | 0.90% |
#45
15
Prev: #30
|
0.8 |
—
|
-2,752 | -3.4% |
P
S
|
77,245 | $5,369,300 | 2015 Q1 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
WLDN
WILLDAN GROUP I...
|
Industrials | 0.79% | 0.78% |
#46
6
Prev: #40
|
0.8 |
—
|
-2,333 | -3.1% |
P
S
|
72,557 | $5,360,511 | 2014 Q3 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
PATK
PATRICK INDS IN...
|
Consumer Cyclical | 0.79% | 0.98% |
#47
20
Prev: #27
|
0.8 |
—
|
-3,996 | -4.8% |
P
S
|
78,964 | $5,352,180 | 2016 Q2 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
THRM
GENTHERM INC
|
Consumer Cyclical | 0.78% | 0.48% |
#48
35
Prev: #83
|
2.8 |
—
|
50,273 | 46.6% |
P
S
|
158,243 | $5,269,492 | 2013 Q2 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
MG
MISTRAS GROUP I...
|
Industrials | 0.78% | 0.59% |
#49
13
Prev: #62
|
0.8 |
—
|
-7,918 | -3.1% |
P
S
|
249,209 | $5,248,342 | 2026 Q1 | 13F Filing | 2026-09-30 | 2026-10-19 | |||
|
FET
FORUM ENERGY TE...
|
Energy | 0.77% | 0.44% |
#50
39
Prev: #89
|
0.8 |
—
|
-2,048 | -3.1% |
P
S
|
64,563 | $5,226,375 | 2026 Q2 | 13F Filing | 2026-09-30 | 2026-10-19 |
Showing 1-50 of 326 holdings