2026 Q1 Portfolio Activity
In 2026 Q1, Portolan Capital Management, LLC maintained a portfolio of 185 distinct positions. The most significant new addition was PAR PAC HOLDINGS INC, now representing 2.31% of the total fund value. They heavily accumulated shares in VIRTU FINL INC, increasing the position by 222.1%. The fund also reduced its exposure to CASTLE BIOSCIENCES INC by 21.9%.
Position History
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Total Positions
185
Quarter
2026 Q1
Top Holding
MOD (4.8%)
Top 10 Concentration
28.0%
Turnover Rate
23.4%
Sector HHI
0.18
Items per page:
Showing 1-50 of 185
Portolan Capital Management, LLC Full Holdings List — 2026 Q1
| 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
MOD
MODINE MFG CO
|
Consumer Cyclical | 4.75% | 3.83% |
#1
1
Prev: #2
|
3.9 |
—
|
-123,855 | -23.1% |
P
S
|
412,092 | $89,304,457 | 2009 Q3 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
TTMI
TTM TECHNOLOGIE...
|
Technology | 3.77% | 4.24% |
#2
1
Prev: #1
|
3.0 |
—
|
-419,188 | -36.6% |
P
S
|
727,494 | $70,872,465 | 2024 Q1 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
CLS
CELESTICA INC
|
Technology | 2.97% | 2.73% |
#3
1
Prev: #4
|
4.2 |
—
|
25,588 | 14.9% |
P
S
|
197,863 | $55,734,050 | 2024 Q2 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
VIRT
VIRTU FINL INC
|
Financial Services | 2.84% | 0.67% |
#4
47
Prev: #51
|
4.6 |
—
|
835,604 | 222.1% |
P
S
|
1,211,887 | $53,298,790 | 2024 Q3 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
AKAM
AKAMAI TECHNOLO...
|
Technology | 2.59% | 2.45% |
#5
Prev: #5
|
2.0 |
—
|
-100,879 | -19.2% |
P
S
|
423,442 | $48,632,314 | 2008 Q4 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
VPG
VISHAY PRECISIO...
|
Technology | 2.36% | 1.81% |
#6
3
Prev: #9
|
2.9 |
—
|
142,199 | 16.2% |
P
S
|
1,019,868 | $44,282,669 | 2024 Q4 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
PARR
PAR PAC HOLDING...
|
Energy | 2.31% | — |
#7
Prev: #—
|
4.4 |
—
|
693,834 | — |
NEW
|
693,834 | $43,461,762 | 2022 Q2 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
POWL
POWELL INDS INC
|
Industrials | 2.18% | 1.35% |
#8
11
Prev: #19
|
1.4 |
—
|
-3,286 | -4.2% |
P
S
|
75,830 | $41,030,096 | 2006 Q2 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
BIDU
BAIDU INC
|
Communication Services | 2.17% | 1.85% |
#9
1
Prev: #8
|
3.4 |
—
|
102,748 | 39.0% |
P
S
|
366,429 | $40,827,519 | 2012 Q3 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
PBF
PBF ENERGY INC
|
Energy | 2.03% | — |
#10
Prev: #—
|
4.3 |
—
|
799,998 | — |
NEW
|
799,998 | $38,095,905 | 2013 Q4 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
UTHR
UNITED THERAPEU...
|
Healthcare | 2.00% | 0.96% |
#11
20
Prev: #31
|
3.8 |
—
|
26,682 | 72.6% |
P
S
|
63,435 | $37,615,686 | 2015 Q4 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
REAX
THE REAL BROKER...
|
Real Estate | 1.93% | 2.11% |
#12
6
Prev: #6
|
3.3 |
—
|
3,740,005 | 34.7% |
P
S
|
14,519,848 | $36,299,620 | 2025 Q1 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
GOOS
CANADA GOOSE HL...
|
Consumer Cyclical | 1.88% | 1.48% |
#13
3
Prev: #16
|
3.8 |
—
|
1,079,373 | 50.5% |
P
S
|
3,218,277 | $35,304,499 | 2024 Q4 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
CRGY
CRESCENT ENERGY...
|
Energy | 1.87% | 0.02% |
#14
140
Prev: #154
|
3.7 |
—
|
2,561,242 | 6419.2% |
P
S
|
2,601,142 | $35,115,417 | 2025 Q4 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
CSTL
CASTLE BIOSCIEN...
|
Healthcare | 1.76% | 3.60% |
#15
12
Prev: #3
|
0.7 |
—
|
-379,180 | -21.9% |
P
S
|
1,350,283 | $33,149,448 | 2019 Q3 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
LNTH
LANTHEUS HLDGS ...
|
Healthcare | 1.68% | 1.70% |
#16
5
Prev: #11
|
1.2 |
—
|
-58,399 | -12.3% |
P
S
|
417,390 | $31,659,032 | 2023 Q1 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
CLBT
CELLEBRITE DI L...
|
Technology | 1.60% | 1.24% |
#17
5
Prev: #22
|
3.6 |
—
|
893,637 | 69.4% |
P
S
|
2,180,924 | $30,053,133 | 2024 Q1 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
LUXE
LUXEXPERIENCE B...
|
ETF | 1.59% | 1.19% |
#18
6
Prev: #24
|
3.1 |
—
|
1,073,269 | 40.3% |
P
S
|
3,733,943 | $29,871,544 | 2023 Q1 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
FLEX
FLEXTRONICS INT...
|
Technology | 1.54% | 1.51% |
#19
5
Prev: #14
|
1.1 |
—
|
-23,785 | -5.1% |
P
S
|
443,128 | $29,007,159 | 2022 Q3 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
FN
FABRINET
|
Technology | 1.52% | 0.27% |
#20
89
Prev: #109
|
3.6 |
—
|
43,885 | 403.4% |
P
S
|
54,763 | $28,560,000 | 2013 Q4 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
ECO
OKEANIS ECO TAN...
|
Industrials | 1.45% | 0.29% |
#21
80
Prev: #101
|
3.6 |
—
|
377,045 | 233.0% |
P
S
|
538,860 | $27,260,927 | 2025 Q4 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
TLN
TALEN ENERGY CO...
|
Utilities | 1.39% | 1.51% |
#22
7
Prev: #15
|
2.6 |
—
|
6,590 | 8.8% |
P
S
|
81,574 | $26,040,868 | 2024 Q3 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
SMTC
SEMTECH CORP
|
Technology | 1.36% | 2.01% |
#23
16
Prev: #7
|
0.5 |
—
|
-176,328 | -34.7% |
P
S
|
332,327 | $25,552,623 | 2024 Q1 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
CNR
CORE NATURAL RE...
|
Energy | 1.32% | 0.62% |
#24
33
Prev: #57
|
3.5 |
—
|
106,794 | 82.0% |
P
S
|
237,036 | $24,824,780 | 2025 Q4 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
MUSA
MURPHY USA INC
|
Consumer Cyclical | 1.26% | — |
#25
Prev: #—
|
4.0 |
—
|
48,107 | — |
NEW
|
48,107 | $23,763,415 | 2026 Q1 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
BIIB
BIOGEN INC
|
Healthcare | 1.16% | 0.80% |
#26
14
Prev: #40
|
3.0 |
—
|
33,491 | 39.4% |
P
S
|
118,481 | $21,721,122 | 2008 Q4 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
KRUS
KURA SUSHI USA ...
|
Consumer Cyclical | 1.12% | 0.53% |
#27
41
Prev: #68
|
3.4 |
—
|
110,416 | 57.9% |
P
S
|
301,212 | $21,021,585 | 2021 Q1 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
QLYS
QUALYS INC
|
Technology | 1.12% | 0.37% |
#28
60
Prev: #88
|
3.4 |
—
|
187,173 | 361.0% |
P
S
|
239,028 | $20,998,610 | 2013 Q4 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
JBL
JABIL INC
|
Technology | 1.09% | 0.86% |
#29
8
Prev: #37
|
2.4 |
—
|
6,532 | 9.2% |
P
S
|
77,197 | $20,505,839 | 2010 Q2 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
CRCL
CIRCLE INTERNET...
|
Financial Services | 1.09% | — |
#30
Prev: #—
|
3.9 |
—
|
213,796 | — |
NEW
|
213,796 | $20,398,276 | 2026 Q1 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
DHT
DHT HOLDINGS IN...
|
Energy | 1.06% | — |
#31
Prev: #—
|
3.9 |
—
|
1,091,788 | — |
NEW
|
1,091,788 | $19,946,967 | 2020 Q4 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
NOK
NOKIA CORP
|
Technology | 1.02% | 0.37% |
#32
53
Prev: #85
|
3.4 |
—
|
1,317,848 | 122.5% |
P
S
|
2,393,970 | $19,247,519 | 2007 Q1 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
ALNT
ALLIENT INC
|
Technology | 1.02% | 0.87% |
#33
3
Prev: #36
|
2.4 |
—
|
21,565 | 7.1% |
P
S
|
323,453 | $19,112,838 | 2025 Q3 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
PRIM
PRIMORIS SVCS C...
|
Industrials | 0.99% | 0.70% |
#34
14
Prev: #48
|
2.9 |
—
|
24,910 | 23.6% |
P
S
|
130,626 | $18,684,743 | 2012 Q3 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
DAVE
DAVE INC
|
Technology | 0.98% | 0.52% |
#35
35
Prev: #70
|
3.4 |
—
|
61,441 | 139.6% |
P
S
|
105,442 | $18,356,398 | 2008 Q2 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
KTOS
KRATOS DEFENSE ...
|
Industrials | 0.97% | 1.20% |
#36
13
Prev: #23
|
0.9 |
—
|
-34,195 | -11.6% |
P
S
|
259,811 | $18,319,274 | 2023 Q2 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
MAMA
MAMAS CREATIONS...
|
Consumer Defensive | 0.96% | 0.90% |
#37
3
Prev: #34
|
0.9 |
—
|
-68,831 | -5.5% |
P
S
|
1,176,936 | $18,054,198 | 2024 Q2 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
ADEA
ADEIA INC
|
Technology | 0.93% | 0.24% |
#38
74
Prev: #112
|
3.4 |
—
|
473,253 | 184.7% |
P
S
|
729,461 | $17,528,948 | 2025 Q4 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
UPWK
UPWORK INC
|
Communication Services | 0.92% | 0.76% |
#39
6
Prev: #45
|
3.4 |
—
|
850,916 | 118.2% |
P
S
|
1,570,560 | $17,213,338 | 2025 Q1 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
PLSE
PULSE BIOSCIENC...
|
Healthcare | 0.84% | 0.29% |
#40
62
Prev: #102
|
3.3 |
—
|
339,873 | 86.4% |
P
S
|
733,372 | $15,833,501 | 2025 Q3 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
PRCH
PORCH GROUP INC
|
Financial Services | 0.82% | 1.02% |
#41
13
Prev: #28
|
0.8 |
—
|
61,835 | 3.0% |
P
S
|
2,144,890 | $15,378,861 | 2020 Q4 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
HAFN
HAFNIA LTD
|
Industrials | 0.79% | — |
#42
Prev: #—
|
3.8 |
—
|
1,948,717 | — |
NEW
|
1,948,717 | $14,810,249 | 2026 Q1 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
MEC
MAYVILLE ENGR C...
|
Industrials | 0.78% | 0.51% |
#43
29
Prev: #72
|
3.3 |
—
|
308,374 | 60.1% |
P
S
|
821,136 | $14,739,391 | 2025 Q4 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
CADL
CANDEL THERAPEU...
|
Healthcare | 0.75% | 0.51% |
#44
29
Prev: #73
|
3.3 |
—
|
1,198,958 | 70.7% |
P
S
|
2,894,325 | $14,182,193 | 2024 Q4 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
LASR
NLIGHT INC
|
Technology | 0.68% | 1.19% |
#45
20
Prev: #25
|
0.3 |
—
|
-364,857 | -61.8% |
P
S
|
225,576 | $12,862,344 | 2025 Q3 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
GENI
GENIUS SPORTS L...
|
Communication Services | 0.66% | 1.73% |
#46
36
Prev: #10
|
0.8 |
—
|
-147,101 | -5.0% |
P
S
|
2,791,018 | $12,364,210 | 2022 Q4 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
AS
AMER SPORTS INC
|
Consumer Cyclical | 0.63% | — |
#47
Prev: #—
|
3.8 |
—
|
357,826 | — |
NEW
|
357,826 | $11,779,632 | 2026 Q1 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
EBAY
EBAY INC.
|
Consumer Cyclical | 0.61% | 0.27% |
#48
60
Prev: #108
|
3.2 |
—
|
67,952 | 116.9% |
P
S
|
126,096 | $11,477,258 | 2008 Q4 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
PKE
PARK AEROSPACE ...
|
Industrials | 0.60% | 0.28% |
#49
56
Prev: #105
|
3.2 |
—
|
165,620 | 67.6% |
P
S
|
410,655 | $11,243,734 | 2025 Q3 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
ENVA
ENOVA INTL INC
|
Financial Services | 0.58% | 0.82% |
#50
11
Prev: #39
|
0.7 |
—
|
-16,924 | -17.3% |
P
S
|
80,923 | $10,991,771 | 2020 Q3 | 13F Filing | 2026-03-31 | 2026-05-15 |
Showing 1-50 of 185 holdings