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Portolan Capital Management Portfolio holdings

AUM $2.67B
1-Year Est. Return 169.09%
This Fund
S&P 500
This Quarter Est. Return
+69.41%
1 Year Est. Return
+169.09%
3 Year Est. Return
+737.83%
5 Year Est. Return
+1,497.12%
10 Year Est. Return
+21,256.61%
AUM
$2.67B
AUM Growth
+$792M
Cap. Flow
+$21.4M
Cap. Flow %
0.8%
Top 10 Hldgs %
29.02%
Holding
180
New
36
Increased
49
Reduced
59
Closed
32

Top Buys

Rank Stock Value
1
VIRT icon
Virtu Financial
VIRT
+$48.9M
2
FOUR icon
Shift4
FOUR
+$38.9M
3
QLYS icon
Qualys
QLYS
+$28.6M
4
SRAD icon
Sportradar
SRAD
+$26.5M
5
PENG
Penguin Solutions Inc
PENG
+$24.8M

Top Sells

Rank Stock Value
1
PBF icon
PBF Energy
PBF
+$38.1M
2
TTMI icon
TTM Technologies
TTMI
+$35.4M
3
CRGY icon
Crescent Energy
CRGY
+$35.1M
4
BIDU icon
Baidu
BIDU
+$33.5M
5
FN icon
Fabrinet
FN
+$31.2M

Sector Composition

Rank Sector Weight
1 Technology 44.68%
2 Consumer Discretionary 12.13%
3 Industrials 12.05%
4 Healthcare 11.19%
5 Financials 9.77%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
DGII icon
76
Digi International
DGII
$2.63B
$10.6M 0.4%
141,243
-29,013
-17% -$1.8M
LASR icon
77
nLIGHT
LASR
$2.31B
$10.6M 0.4%
151,867
-73,709
-33% -$5.14M
VIAV icon
78
Viavi Solutions
VIAV
$8.6B
$10.5M 0.39%
220,118
+74,274
+51% +$3.56M
BOOT icon
79
Boot Barn
BOOT
$4.67B
$10.5M 0.39%
+63,759
New +$10.3M
LPTH icon
80
Lightpath Technologies
LPTH
$607M
$10.3M 0.39%
629,168
-411,294
-40% -$5.74M
FEIM icon
81
Frequency Electronics
FEIM
$678M
$10.1M 0.38%
152,818
+2,677
+2% +$165K
HALO icon
82
Halozyme
HALO
$12.5B
$9.98M 0.37%
+127,498
New +$8.69M
ECO
83
Okeanis Eco Tankers
ECO
$2.79B
$9.82M 0.37%
195,997
-342,863
-64% -$17.9M
ZGN icon
84
Zegna
ZGN
$5.32B
$9.82M 0.37%
753,948
+43,322
+6% +$559K
SG icon
85
Sweetgreen
SG
$814M
$9.07M 0.34%
+1,029,016
New +$7.85M
TPR icon
86
Tapestry
TPR
$24.4B
$9.03M 0.34%
61,688
+44,650
+262% +$6.4M
SEI
87
Solaris Energy Infrastructure
SEI
$3.62B
$8.64M 0.32%
107,401
+79,471
+285% +$5.68M
ATEN icon
88
A10 Networks
ATEN
$1.79B
$8.48M 0.32%
+226,920
New +$6.59M
AMBA icon
89
Ambarella
AMBA
$2.78B
$8.33M 0.31%
97,072
-11,677
-11% -$804K
TGLS icon
90
Tecnoglass Holdings
TGLS
$1.81B
$8.25M 0.31%
+176,254
New +$7.62M
QTRX icon
91
Quanterix
QTRX
$127M
$8.21M 0.31%
1,899,308
-1,046,515
-36% -$3.39M
TGEN
92
Tecogen Inc
TGEN
$94.5M
$8.1M 0.3%
1,551,113
+1,107,558
+250% +$5.55M
HQY icon
93
HealthEquity
HQY
$7.95B
$8.06M 0.3%
89,274
-12,372
-12% -$1.05M
TSEM icon
94
Tower Semiconductor
TSEM
$25.1B
$7.96M 0.3%
30,557
-1,486
-5% -$356K
CSTL icon
95
Castle Biosciences
CSTL
$1.01B
$7.84M 0.29%
328,818
-1,021,465
-76% -$22.8M
SILC icon
96
Silicom
SILC
$235M
$7.79M 0.29%
+162,466
New +$6.18M
CIEN icon
97
Ciena
CIEN
$45.5B
$7.49M 0.28%
15,272
-3,194
-17% -$1.63M
EBAY icon
98
eBay
EBAY
$46B
$7.35M 0.28%
65,741
-60,355
-48% -$6.44M
RBA icon
99
RB Global
RBA
$15.5B
$7.34M 0.27%
+63,009
New +$6.63M
XMTR icon
100
Xometry
XMTR
$5.3B
$7.06M 0.26%
+73,163
New +$5.23M
2 3
4
5 6

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Portolan Capital Management's Q2 2026 Portfolio in Review

As of Q2 2026, Portolan Capital Management held 180 positions worth $2.67B, up 42% from $1.88B the previous quarter. Its ten largest holdings account for 29% of the portfolio.

Portolan Capital Management's Q2 2026 filing shows 36 new, 49 increased, 59 reduced and 32 closed positions. Its largest new stake was Sportradar: 1,819,949 shares worth $27.2M. The largest sale was PBF Energy, an estimated $38.1M.

By sector, the portfolio is most concentrated in Technology at 45% of assets, up from 34% a quarter earlier, followed by Consumer Discretionary and Industrials.

  • Portolan Capital Management's largest Q2 2026 buy was Sportradar: 1,819,949 shares worth $27.2M.
  • Portolan Capital Management added most to Virtu Financial in Q2 2026, an estimated $48.9M increase.
  • Portolan Capital Management's biggest Q2 2026 reduction was TTM Technologies, cutting an estimated $35.4M.
  • Portolan Capital Management fully exited PBF Energy in Q2 2026, selling an estimated $38.1M.
  • Portolan Capital Management's ten largest holdings make up 29% of its $2.67B portfolio in Q2 2026.
  • Portolan Capital Management opened 36 new positions and closed 32 in Q2 2026.
  • Portolan Capital Management's portfolio value rose 42% quarter-over-quarter to $2.67B.

Based on Portolan Capital Management's 13F filing for Q2 2026, filed 14 Aug 2026.