2026 Q2 Portfolio Activity
In 2026 Q2, ESSEX INVESTMENT MANAGEMENT CO LLC maintained a portfolio of 332 distinct positions. The most significant new addition was WERNER ENTERPRISES INC, now representing 1.32% of the total fund value. They heavily accumulated shares in OUSTER INC, increasing the position by 22.5%. Conversely, ESSEX INVESTMENT MANAGEMENT CO LLC completely exited their position in GLOBALSTAR INC.
Position History
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Total Positions
332
Quarter
2026 Q2
Top Holding
TSEM (3.6%)
Top 10 Concentration
20.1%
Turnover Rate
23.4%
Sector HHI
0.18
Items per page:
Showing 1-50 of 332
ESSEX INVESTMENT MANAGEMENT CO LLC Full Holdings List — 2026 Q2
| 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 | 3.60% | 3.22% |
#1
Prev: #1
|
3.9 |
—
|
-10,390 | -9.0% |
P
S
|
105,543 | $27,508,728 | 2014 Q3 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
LINC
LINCOLN EDL SVC...
|
Consumer Defensive | 2.22% | 2.29% |
#2
Prev: #2
|
2.9 |
—
|
-14,938 | -4.2% |
P
S
|
340,366 | $16,984,263 | 2011 Q1 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
KNSA
KINIKSA PHARMAC...
|
Healthcare | 2.02% | 1.90% |
#3
1
Prev: #4
|
2.3 |
—
|
-7,896 | -3.2% |
P
S
|
241,382 | $15,436,379 | 2024 Q2 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
OUST
OUSTER INC
|
Technology | 1.85% | 0.54% |
#4
61
Prev: #65
|
3.7 |
—
|
41,443 | 22.5% |
P
S
|
226,028 | $14,131,271 | 2024 Q1 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
LGND
LIGAND PHARMACE...
|
Healthcare | 1.80% | 1.85% |
#5
Prev: #5
|
1.2 |
—
|
-14,893 | -25.5% |
P
S
|
43,567 | $13,771,093 | 2012 Q4 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
CECO
CECO ENVIRONMEN...
|
Industrials | 1.79% | 1.48% |
#6
6
Prev: #12
|
1.2 |
—
|
-6,830 | -4.3% |
P
S
|
150,416 | $13,648,748 | 1999 Q1 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
STRL
STERLING INFRAS...
|
Industrials | 1.78% | 2.07% |
#7
4
Prev: #3
|
0.7 |
—
|
-15,902 | -49.6% |
P
S
|
16,155 | $13,559,861 | 2015 Q3 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
AIP
ARTERIS INC
|
Technology | 1.77% | 0.76% |
#8
32
Prev: #40
|
1.2 |
—
|
-12,654 | -4.4% |
P
S
|
277,665 | $13,491,742 | 2024 Q3 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
MIRM
MIRUM PHARMACEU...
|
Healthcare | 1.62% | 1.58% |
#9
2
Prev: #11
|
1.1 |
—
|
-2,669 | -2.5% |
P
S
|
105,669 | $12,370,670 | 2025 Q2 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
AGX
ARGAN INC
|
Industrials | 1.62% | 1.39% |
#10
4
Prev: #14
|
1.1 |
—
|
-631 | -3.9% |
P
S
|
15,467 | $12,351,173 | 2023 Q4 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
GHM
GRAHAM CORP
|
Industrials | 1.51% | 1.60% |
#11
1
Prev: #10
|
0.6 |
—
|
-34,889 | -27.2% |
P
S
|
93,405 | $11,562,605 | 2018 Q3 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
DRS
LEONARDO DRS IN...
|
Industrials | 1.40% | 1.84% |
#12
6
Prev: #6
|
1.1 |
—
|
-11,239 | -4.3% |
P
S
|
250,215 | $10,676,674 | 2022 Q4 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
ADPT
ADAPTIVE BIOTEC...
|
Healthcare | 1.33% | 1.08% |
#13
9
Prev: #22
|
1.0 |
—
|
-20,640 | -4.2% |
P
S
|
472,763 | $10,140,766 | 2001 Q4 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
WERN
WERNER ENTERPRI...
|
Industrials | 1.32% | — |
#14
Prev: #—
|
4.0 |
—
|
231,625 | — |
NEW
|
231,625 | $10,101,166 | 2002 Q2 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
HCI
HCI GROUP INC
|
Financial Services | 1.29% | 1.41% |
#15
2
Prev: #13
|
1.0 |
—
|
-1,374 | -2.4% |
P
S
|
56,260 | $9,859,565 | 2018 Q2 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
GEV
GE VERNOVA INC
|
Industrials | 1.27% | 1.15% |
#16
4
Prev: #20
|
1.0 |
—
|
-36 | -0.4% |
P
S
|
8,283 | $9,731,365 | 2024 Q2 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
COHU
COHU INC
|
Technology | 1.27% | 0.93% |
#17
9
Prev: #26
|
0.5 |
—
|
-60,715 | -31.6% |
P
S
|
131,170 | $9,694,775 | 2025 Q2 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
AAPL
APPLE INC
|
Technology | 1.23% | 1.31% |
#18
3
Prev: #15
|
1.0 |
—
|
-153 | -0.5% |
P
S
|
32,427 | $9,383,077 | 1999 Q2 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
AMSC
AMERICAN SUPERC...
|
Industrials | 1.21% | 1.22% |
#19
1
Prev: #18
|
1.0 |
—
|
-5,625 | -2.5% |
P
S
|
221,933 | $9,212,439 | 2000 Q3 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
BWAY
BRAINSWAY LTD
|
Healthcare | 1.20% | 1.30% |
#20
4
Prev: #16
|
1.0 |
—
|
-25,947 | -4.2% |
P
S
|
592,606 | $9,191,319 | 2020 Q3 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
TTI
TETRA TECHNOLOG...
|
Industrials | 1.10% | 1.04% |
#21
2
Prev: #23
|
0.9 |
—
|
-33,092 | -4.3% |
P
S
|
741,007 | $8,395,609 | 2012 Q4 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
LYTS
LSI INDS INC OH...
|
Technology | 1.03% | 0.81% |
#22
14
Prev: #36
|
2.4 |
—
|
21,738 | 7.9% |
P
S
|
295,820 | $7,862,896 | 2009 Q4 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
MRVL
MARVELL TECHNOL...
|
Technology | 1.01% | 0.57% |
#23
34
Prev: #57
|
0.4 |
—
|
-10,292 | -28.4% |
P
S
|
25,911 | $7,718,628 | 2001 Q4 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
KTOS
KRATOS DEFENSE ...
|
Industrials | 1.00% | 1.77% |
#24
17
Prev: #7
|
0.9 |
—
|
-5,268 | -3.3% |
P
S
|
153,576 | $7,657,299 | 2022 Q1 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
TVTX
TRAVERE THERAPE...
|
Healthcare | 1.00% | 0.76% |
#25
14
Prev: #39
|
0.9 |
—
|
-27,839 | -17.2% |
P
S
|
133,866 | $7,604,927 | 2021 Q4 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
GS
GOLDMAN SACHS G...
|
Financial Services | 1.00% | 1.01% |
#26
2
Prev: #24
|
0.9 |
—
|
-43 | -0.6% |
P
S
|
7,513 | $7,598,423 | 1999 Q2 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
PATK
PATRICK INDS IN...
|
Consumer Cyclical | 0.98% | 0.81% |
#27
8
Prev: #35
|
3.4 |
—
|
36,732 | 79.5% |
P
S
|
82,960 | $7,448,149 | 2016 Q2 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
ORN
ORION GROUP HLD...
|
Industrials | 0.98% | 0.80% |
#28
9
Prev: #37
|
0.9 |
—
|
-19,169 | -4.2% |
P
S
|
442,603 | $7,444,582 | 2001 Q1 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
ASML
ASML HLDG NV
|
Technology | 0.92% | 0.74% |
#29
13
Prev: #42
|
0.9 |
—
|
-18 | -0.5% |
P
S
|
3,538 | $7,038,639 | 1999 Q1 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
AMBA
AMBARELLA INC
|
Technology | 0.90% | 0.67% |
#30
18
Prev: #48
|
0.9 |
—
|
-2,390 | -2.9% |
P
S
|
79,997 | $6,863,743 | 2015 Q1 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
NVCR
NOVOCURE LTD
|
Healthcare | 0.87% | 0.78% |
#31
7
Prev: #38
|
0.8 |
—
|
-12,722 | -2.8% |
P
S
|
439,648 | $6,660,667 | 2017 Q3 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
AMZN
AMAZON COM INC
|
Consumer Cyclical | 0.84% | 0.90% |
#32
3
Prev: #29
|
0.8 |
—
|
-146 | -0.5% |
P
S
|
27,062 | $6,449,957 | 1999 Q1 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
AVPT
AVEPOINT INC
|
Technology | 0.84% | 0.75% |
#33
8
Prev: #41
|
2.3 |
—
|
73,059 | 14.7% |
P
S
|
571,541 | $6,406,975 | 2024 Q1 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
WMS
ADVANCED DRAIN ...
|
Industrials | 0.83% | 0.88% |
#34
3
Prev: #31
|
0.8 |
—
|
-156 | -0.4% |
P
S
|
40,413 | $6,343,224 | 2015 Q1 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
SMTC
SEMTECH CORP
|
Technology | 0.81% | 0.62% |
#35
19
Prev: #54
|
0.3 |
—
|
-12,418 | -24.5% |
P
S
|
38,226 | $6,186,878 | 1999 Q3 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
OII
OCEANEERING INT...
|
Energy | 0.80% | 0.89% |
#36
6
Prev: #30
|
0.8 |
—
|
-6,911 | -4.4% |
P
S
|
151,463 | $6,137,281 | 2005 Q4 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
ECG
EVERUS CONSTR G...
|
Industrials | 0.79% | 0.71% |
#37
8
Prev: #45
|
0.8 |
—
|
-1,721 | -4.5% |
P
S
|
36,377 | $6,036,763 | 2024 Q4 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
AEM
AGNICO EAGLE MI...
|
Basic Materials | 0.78% | 1.24% |
#38
21
Prev: #17
|
0.8 |
—
|
-181 | -0.5% |
P
S
|
38,462 | $5,966,610 | 2002 Q1 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
LQDA
LIQUIDIA CORPOR...
|
Healthcare | 0.78% | 0.47% |
#39
45
Prev: #84
|
0.8 |
—
|
-3,428 | -4.4% |
P
S
|
74,743 | $5,959,259 | 2026 Q1 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
WLDN
WILLDAN GROUP I...
|
Industrials | 0.78% | 0.95% |
#40
15
Prev: #25
|
0.8 |
—
|
-3,402 | -4.3% |
P
S
|
74,890 | $5,923,799 | 2014 Q3 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
FEIM
FREQUENCY ELECT...
|
Technology | 0.77% | 0.65% |
#41
9
Prev: #50
|
0.8 |
—
|
-3,983 | -4.3% |
P
S
|
89,043 | $5,908,003 | 2020 Q3 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
MSFT
MICROSOFT CORP
|
Technology | 0.77% | 0.93% |
#42
15
Prev: #27
|
0.8 |
—
|
-77 | -0.5% |
P
S
|
15,714 | $5,861,636 | 1999 Q1 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
MAMA
MAMAS CREATIONS...
|
Consumer Defensive | 0.76% | 0.83% |
#43
10
Prev: #33
|
0.8 |
—
|
-14,719 | -4.3% |
P
S
|
326,938 | $5,835,843 | 2025 Q2 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
XERS
XERIS BIOPHARMA...
|
Healthcare | 0.74% | 0.69% |
#44
2
Prev: #46
|
0.8 |
—
|
-32,161 | -4.3% |
P
S
|
715,608 | $5,667,615 | 2024 Q4 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
PKE
PARK AEROSPACE ...
|
Industrials | 0.72% | 0.65% |
#45
7
Prev: #52
|
0.8 |
—
|
-6,230 | -4.2% |
P
S
|
143,663 | $5,482,180 | 2010 Q1 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
BDSX
BIODESIX INC
|
Healthcare | 0.71% | 0.30% |
#46
69
Prev: #115
|
3.3 |
—
|
109,829 | 83.1% |
P
S
|
241,915 | $5,455,183 | 2021 Q1 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
XMTR
XOMETRY INC
|
Industrials | 0.71% | — |
#47
Prev: #—
|
3.8 |
—
|
55,919 | — |
NEW
|
55,919 | $5,397,302 | 2026 Q2 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
BXC
BLUELINX HLDGS ...
|
Industrials | 0.70% | — |
#48
Prev: #—
|
3.8 |
—
|
86,593 | — |
NEW
|
86,593 | $5,358,375 | 2026 Q2 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
MITK
MITEK SYS INC
|
Technology | 0.70% | 0.59% |
#49
7
Prev: #56
|
0.8 |
—
|
-11,689 | -4.2% |
P
S
|
263,913 | $5,312,569 | 2011 Q3 | 13F Filing | 2026-06-30 | 2026-08-06 | |||
|
CXDO
CREXENDO INC
|
Communication Services | 0.70% | 0.73% |
#50
6
Prev: #44
|
0.8 |
—
|
-32,112 | -4.3% |
P
S
|
710,874 | $5,310,229 | 2020 Q3 | 13F Filing | 2026-06-30 | 2026-08-06 |
Showing 1-50 of 332 holdings