PORTOLAN CAPITAL MANAGEMENT LLC
Q4 2025 Form 13-F
BOSTON, MASSACHUSETTS
CIK 0001350290
· CRD 157542
· SEC-registered investment adviser
$1.9B Reported Value Total
PORTOLAN CAPITAL MANAGEMENT, LLC reports 22 total accounts under management (AUM). There are 22 discretionary accounts valued at $1,581,996,022, and 0 non-discretionary accounts.
Source: Form ADV filed * Note that certain holdings are exempt from Form 13-F reporting, so the AUM totals may be greater than the Form 13-F total.
Private funds (Form ADV)
7 funds
· $822.9M gross asset value
Hedge Fund: $822.9M
Source: Form ADV filed 2026-04-15
Reported value
$1.9B
Quarter over quarter
+1.8%
Holdings
155
Top-10 concentration
26.4%
Key People
Form ADV owners & control persons
George Frederic Mccabe
CHIEF INVESTMENT OFFICER, MANAGING DIRECTOR, AND SOLE MEMBER
Nancy Jean Bonner
CHIEF ADMINISTRATIVE OFFICER
Betsy Hochadel Flaherty
CHIEF COMPLIANCE OFFICER
Filing Navigation
Coverage begins with the second quarter of 2013. Earlier quarters are not shown while their accuracy is being verified.
13F Metrics
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Q4 2025 13F record
Q4 2025 13F filing summary
| Period of report | December 31, 2025 |
|---|---|
| Filed | February 17, 2026 |
| Form | 13F-HR |
| Reported value | $1.9B |
| Positions | 155 |
| Change in reported value | +1.0% |
| New positions | 57 |
| Exited positions | 21 |
| Position turnover | 44.3% |
| Top-10 concentration | 26.4% |
13F filings by quarter
| Quarter | Positions | Value |
|---|---|---|
|
Q2 2026 13F
Filed Aug 14, 2026
|
148 | $2.7B |
|
Q1 2026 13F
Filed May 15, 2026
|
144 | $1.9B |
|
Q4 2025 13F
Filed Feb 17, 2026
|
155 | $1.9B |
|
Q3 2025 13F
Filed Nov 13, 2025
|
119 | $1.8B |
|
Q2 2025 13F
Filed Aug 13, 2025
|
118 | $1.6B |
|
Q1 2025 13F
Filed May 15, 2025
|
109 | $1.3B |
|
Q4 2024 13F
Filed Feb 13, 2025
|
131 | $1.5B |
|
Q3 2024 13F
Filed Nov 14, 2024
|
129 | $1.4B |
|
Q2 2024 13F
Filed Aug 14, 2024
|
117 | $1.2B |
|
Q1 2024 13F
Filed May 15, 2024
|
116 | $1.3B |
|
Q4 2023 13F
Filed Feb 14, 2024
|
127 | $1.1B |
|
Q3 2023 13F
Filed Nov 14, 2023
|
123 | $1.1B |
|
Q2 2023 13F
Filed Aug 14, 2023
|
120 | $1.1B |
|
Q1 2023 13F
Filed May 15, 2023
|
139 | $1.0B |
|
Q4 2022 13F
Filed Feb 13, 2023
|
131 | $1.0B |
|
Q3 2022 13F
Filed Nov 14, 2022
|
128 | $946.2M |
|
Q2 2022 13F
Filed Aug 15, 2022
|
123 | $993.2M |
|
Q1 2022 13F
Filed May 16, 2022
|
136 | $1.3B |
|
Q4 2021 13F
Filed Feb 14, 2022
|
131 | $1.5B |
|
Q3 2021 13F
Filed Nov 15, 2021
|
134 | $1.4B |
33 earlier quarters on file — choose one from the quarter menu above.
Top 20 holdings · Q4 2025
| # | Holding | Reported value | % of portfolio |
|---|---|---|---|
| 1 | TTMI TTM TECHNOLOGIES INC | $79.1M | 4.24% |
| 2 | MOD MODINE MFG CO | $71.6M | 3.83% |
| 3 | CSTL CASTLE BIOSCIENCES INC | $67.3M | 3.6% |
| 4 | CLS CELESTICA INC | $50.9M | 2.73% |
| 5 | AKAM AKAMAI TECHNOLOGIES INC | $45.7M | 2.45% |
| 6 | REAX THE REAL BROKERAGE INC | $39.3M | 2.11% |
| 7 | SMTC SEMTECH CORP | $37.5M | 2.01% |
| 8 | BIDU BAIDU INC | $34.5M | 1.85% |
| 9 | VPG VISHAY PRECISION GROUP INC | $33.8M | 1.81% |
| 10 | GENI GENIUS SPORTS LIMITED | $32.4M | 1.73% |
| 11 | LNTH LANTHEUS HLDGS INC | $31.7M | 1.7% |
| 12 | FOUR SHIFT4 PMTS INC | $29.5M | 1.58% |
| 13 | QTRX QUANTERIX CORP | $28.8M | 1.54% |
| 14 | FLEX FLEX LTD | $28.2M | 1.51% |
| 15 | TLN TALEN ENERGY CORP | $28.1M | 1.51% |
| 16 | GOOS CANADA GOOSE HLDGS INC | $27.7M | 1.48% |
| 17 | WRBY WARBY PARKER INC | $26.8M | 1.44% |
| 18 | ZETA ZETA GLOBAL HOLDINGS CORP | $26.8M | 1.44% |
| 19 | POWL POWELL INDS INC | $25.2M | 1.35% |
| 20 | LPTH LIGHTPATH TECHNOLOGIES INC | $25.2M | 1.35% |
Values as reported on the Q4 2025 Form 13F. Every position is in the holdings table below.