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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
RL icon
151
Ralph Lauren
RL
$23.6B
– –
-17,029
Closed -$4.67M
RRX icon
152
Regal Rexnord
RRX
$11.9B
– –
-24,943
Closed -$3.62M
SLM icon
153
SLM Corp
SLM
$5.15B
– –
-710,291
Closed -$23.3M
SM icon
154
SM Energy
SM
$6.87B
– –
-170,194
Closed -$4.21M
STLN
155
Starling Oncology, Inc. Common Stock
STLN
$641M
– –
-221,512
Closed -$454K
VIRT icon
156
Virtu Financial
VIRT
$4.93B
– –
-273,367
Closed -$12.2M
WEAV icon
157
Weave Communications
WEAV
$423M
– –
-648,765
Closed -$5.4M
MRX
158
Marex Group Limited Ordinary Shares
MRX
$4.37B
– –
-83,759
Closed -$3.31M
TTAM
159
Titan America SA
TTAM
$2.95B
– –
-359,435
Closed -$4.49M
3 4 5 6
7

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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.