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Portolan Capital Management Portfolio holdings

AUM $1.88B
1-Year Est. Return 115.74%
This Fund
S&P 500
This Quarter Est. Return
+28.36%
1 Year Est. Return
+115.74%
3 Year Est. Return
+581.85%
5 Year Est. Return
+1,047.01%
10 Year Est. Return
+13,266.68%
AUM
$1.85B
AUM Growth
+$253M
Cap. Flow
-$62.9M
Cap. Flow %
-3.41%
Top 10 Hldgs %
31.58%
Holding
159
New
41
Increased
35
Reduced
42
Closed
40

Top Buys

Rank Stock Value
1
DBRG icon
DigitalBridge
DBRG
+$26.7M
2
DOMO icon
Domo
DOMO
+$24.4M
3
CLBT icon
Cellebrite
CLBT
+$22.1M
4
WWW icon
Wolverine World Wide
WWW
+$21M
5
LASR icon
nLIGHT
LASR
+$19.1M

Top Sells

Rank Stock Value
1
CLS icon
Celestica
CLS
+$60.1M
2
KTOS icon
Kratos Defense & Security Solutions
KTOS
+$46.9M
3
SLM icon
SLM Corp
SLM
+$23.3M
4
FOUR icon
Shift4
FOUR
+$22.9M
5
PBPB
Potbelly
PBPB
+$20.4M

Sector Composition

Rank Sector Weight
1 Technology 36.26%
2 Industrials 16.27%
3 Consumer Discretionary 11.86%
4 Healthcare 9.33%
5 Financials 7.51%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
WWW icon
26
Wolverine World Wide
WWW
$1.55B
$21.9M 1.18%
+796,627
New +$21M
GDOT icon
27
Green Dot
GDOT
$745M
$21.7M 1.17%
1,615,280
+214,152
+15% +$2.64M
MAMA icon
28
Mama's Creations
MAMA
$833M
$21.4M 1.16%
2,034,928
-130,622
-6% -$1.18M
PRIM icon
29
Primoris Services
PRIM
$4.45B
$20.5M 1.11%
149,241
+49,792
+50% +$5.35M
ZETA icon
30
Zeta Global
ZETA
$6.69B
$20.4M 1.1%
1,025,195
-290,495
-22% -$5.22M
PSIX
31
Power Solutions International
PSIX
$942M
$19.2M 1.04%
+195,804
New +$17.4M
FSLR icon
32
First Solar
FSLR
$26.9B
$18.3M 0.99%
+83,198
New +$16M
WRBY icon
33
Warby Parker
WRBY
$3.27B
$17.8M 0.96%
646,088
-303,189
-32% -$7.66M
BELFB
34
Bel Fuse Inc Class B
BELFB
$4.21B
$17.5M 0.94%
123,766
+61,240
+98% +$7.8M
RDNT icon
35
RadNet
RDNT
$5.69B
$17.3M 0.93%
226,669
-114,686
-34% -$7.45M
WIX icon
36
WIX.com
WIX
$2.52B
$17M 0.92%
+95,809
New +$14.4M
ACMR icon
37
ACM Research
ACMR
$5.79B
$15.9M 0.86%
+405,860
New +$12M
LNTH icon
38
Lantheus
LNTH
$6.59B
$15.2M 0.82%
297,208
+42,731
+17% +$2.67M
VRT icon
39
Vertiv
VRT
$105B
$15.2M 0.82%
100,599
+23,884
+31% +$3.19M
FOUR icon
40
Shift4
FOUR
$3.26B
$14.6M 0.79%
188,761
-246,414
-57% -$22.9M
SEI
41
Solaris Energy Infrastructure
SEI
$3.82B
$14.5M 0.79%
+363,440
New +$11.4M
SMCI icon
42
Super Micro Computer
SMCI
$20.1B
$14.2M 0.77%
296,341
+197,793
+201% +$9.44M
AAOI icon
43
Applied Optoelectronics
AAOI
$11.5B
$14.2M 0.77%
546,219
+90,897
+20% +$2.32M
DKNG icon
44
DraftKings
DKNG
$11.9B
$13.9M 0.75%
372,002
-118,545
-24% -$5.26M
CDNA icon
45
CareDx
CDNA
$2.42B
$13.6M 0.73%
933,532
+303,555
+48% +$4.33M
LUXE
46
LuxExperience B.V.
LUXE
$1.11B
$13.3M 0.72%
1,561,266
-1,499,271
-49% -$12.5M
BIO icon
47
Bio-Rad Laboratories Class A
BIO
$9.42B
$13M 0.7%
46,440
-16,344
-26% -$4.45M
SPHR icon
48
Sphere Entertainment
SPHR
$5.73B
$12.9M 0.7%
+208,418
New +$9.84M
LPTH icon
49
Lightpath Technologies
LPTH
$820M
$12.9M 0.7%
+1,631,622
New +$7.28M
ZGN icon
50
Zegna
ZGN
$4B
$12.9M 0.7%
1,369,176
+185,190
+16% +$1.61M
1
2
3 4 5

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Portolan Capital Management's Q3 2025 Portfolio in Review

As of Q3 2025, Portolan Capital Management held 159 positions worth $1.85B, up 16% from $1.59B the previous quarter. Its ten largest holdings account for 32% of the portfolio.

Portolan Capital Management withdrew a net $62.9M in Q3 2025, closing 40 positions and reducing 42 holdings. Its most notable exit was SLM Corp, an estimated $23.3M position sold in full.

By sector, the portfolio is most concentrated in Technology at 36% of assets, up from 27% a quarter earlier, followed by Industrials and Consumer Discretionary.

Against the trend, Portolan Capital Management opened a new position in Wolverine World Wide worth $21.9M.

  • Portolan Capital Management's largest Q3 2025 buy was Wolverine World Wide: 796,627 shares worth $21.9M.
  • Portolan Capital Management added most to DigitalBridge in Q3 2025, an estimated $26.7M increase.
  • Portolan Capital Management's biggest Q3 2025 reduction was Celestica, cutting an estimated $60.1M.
  • Portolan Capital Management fully exited SLM Corp in Q3 2025, selling an estimated $23.3M.
  • Portolan Capital Management's ten largest holdings make up 32% of its $1.85B portfolio in Q3 2025.
  • Portolan Capital Management opened 41 new positions and closed 40 in Q3 2025.
  • Portolan Capital Management's portfolio value rose 16% quarter-over-quarter to $1.85B.

Based on Portolan Capital Management's 13F filing for Q3 2025, filed 13 Nov 2025.