PORTOLAN CAPITAL MANAGEMENT LLC
Q1 2026 Form 13-F
BOSTON, MASSACHUSETTS
CIK 0001350290
· CRD 157542
· SEC-registered investment adviser
$1.9B Reported Value Total
PORTOLAN CAPITAL MANAGEMENT, LLC reports 20 total accounts under management (AUM). There are 20 discretionary accounts valued at $2,021,361,155, 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
+1.4%
Holdings
144
Top-10 concentration
28.0%
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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Q1 2026 13F record
Q1 2026 13F filing summary
| Period of report | March 31, 2026 |
|---|---|
| Filed | May 15, 2026 |
| Form | 13F-HR |
| Reported value | $1.9B |
| Positions | 144 |
| Change in reported value | +0.7% |
| New positions | 30 |
| Exited positions | 41 |
| Position turnover | 38.4% |
| Top-10 concentration | 28.0% |
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 · Q1 2026
| # | Holding | Reported value | % of portfolio |
|---|---|---|---|
| 1 | MOD MODINE MFG CO | $89.3M | 4.75% |
| 2 | TTMI TTM TECHNOLOGIES INC | $70.9M | 3.77% |
| 3 | CLS CELESTICA INC | $55.7M | 2.97% |
| 4 | VIRT VIRTU FINL INC | $53.3M | 2.84% |
| 5 | AKAM AKAMAI TECHNOLOGIES INC | $48.6M | 2.59% |
| 6 | VPG VISHAY PRECISION GROUP INC | $44.3M | 2.36% |
| 7 | PARR PAR PAC HOLDINGS INC | $43.5M | 2.31% |
| 8 | POWL POWELL INDS INC | $41.0M | 2.18% |
| 9 | BIDU BAIDU INC | $40.8M | 2.17% |
| 10 | PBF PBF ENERGY INC | $38.1M | 2.03% |
| 11 | UTHR UNITED THERAPEUTICS CORP DEL | $37.6M | 2.0% |
| 12 | REAX THE REAL BROKERAGE INC | $36.3M | 1.93% |
| 13 | GOOS CANADA GOOSE HLDGS INC | $35.3M | 1.88% |
| 14 | CRGY CRESCENT ENERGY COMPANY | $35.1M | 1.87% |
| 15 | CSTL CASTLE BIOSCIENCES INC | $33.1M | 1.76% |
| 16 | LNTH LANTHEUS HLDGS INC | $31.7M | 1.68% |
| 17 | CLBT CELLEBRITE DI LTD | $30.1M | 1.6% |
| 18 | LUXE LUXEXPERIENCE BV | $29.9M | 1.59% |
| 19 | FLEX FLEXTRONICS INTL LTD | $29.0M | 1.54% |
| 20 | FN FABRINET | $28.6M | 1.52% |
Values as reported on the Q1 2026 Form 13F. Every position is in the holdings table below.