Portolan Capital Management, LLC
Long book
$1.88B
Q1 2026
Positions
144
Top-10 weight
28%
concentration
Last quarter
+26.1%
SPY +14.8%
Turnover
38%
of book per quarter
Strategy in plain words
auto-generated from filingsPortolan Capital Management, LLC is an institutional manager, running a $1.88B US long book across 144 positions.
The portfolio is moderately concentrated (top 10 ≈ 28% of the book). The portfolio is actively managed, with meaningful quarterly turnover. Current anchor positions: MODINE MANUFACTURING CO, TTM TECHNOLOGIES, CELESTICA INC, VIRTU FINANCIAL INC-CLASS A, AKAMAI TECHNOLOGIES INC.
Over the last 9 quarters its long book ran on average 2.1pp per quarter ahead of the S&P 500, beating the index in 6 of 9 quarters. Signal value of individual moves is limited — treat changes as weak evidence.
Implied long-book return vs S&P 500
methodology: positions priced quarterly, no shorts/options Fund long book S&P 500
Q1 2024
-0.9%
Q2 2024
+7.7%
Q3 2024
+5.1%
Q4 2024
-16.2%
Q1 2025
+18.4%
Q2 2025
+18.6%
Q3 2025
+0.3%
Q4 2025
-0.0%
Q1 2026
+26.1%
Sector allocation
Technology 31%
Industrials 19%
Healthcare 10%
Energy 8%
Services media 7%
Financials 7%
Other 5%
Materials 3%
Long book by quarter
What does Portolan Capital own?
Q1 2026 13F| Company | Sector | Shares | Value | % of book | Change |
|---|---|---|---|---|---|
| MOD MODINE MANUFACTURING CO | Industrials | 412.1K | $89.3M | 4.8% | -23.1% |
| TTMI TTM TECHNOLOGIES | Technology | 727.5K | $70.9M | 3.8% | -36.6% |
| CLS CELESTICA INC | Technology | 197.9K | $55.7M | 3.0% | +14.9% |
| VIRT VIRTU FINANCIAL INC-CLASS A | Financials | 1.2M | $53.3M | 2.8% | +222.1% |
| AKAM AKAMAI TECHNOLOGIES INC | Services media | 423.4K | $48.6M | 2.6% | -19.2% |
| VPG VISHAY PRECISION GROUP | Technology | 1.0M | $44.3M | 2.4% | +16.2% |
| PARR PAR PACIFIC HOLDINGS INC | Energy | 693.8K | $43.5M | 2.3% | New |
| POWL POWELL INDUSTRIES INC | Industrials | 75.8K | $41.0M | 2.2% | -4.2% |
| PBF PBF ENERGY INC-CLASS A | Energy | 800.0K | $38.1M | 2.0% | New |
| UTHR UNITED THERAPEUTICS CORP | Healthcare | 63.4K | $37.6M | 2.0% | +72.6% |
| REAX REAL BROKERAGE INC/THE | Real estate | 14.5M | $36.3M | 1.9% | +34.7% |
| GOOS CANADA GOOSE HOLDINGS INC | Other | 3.2M | $35.3M | 1.9% | +50.5% |
| CRGY CRESCENT ENERGY INC-A | Energy | 2.6M | $35.1M | 1.9% | +6419.2% |
| CSTL CASTLE BIOSCIENCES INC | Healthcare | 1.4M | $33.1M | 1.8% | -21.9% |
| LNTH LANTHEUS HOLDINGS INC | Materials | 417.4K | $31.7M | 1.7% | -12.3% |
| CLBT CELLEBRITE DI LTD | Technology | 2.2M | $30.1M | 1.6% | +69.4% |
| FLEX FLEX LTD | Technology | 443.1K | $29.0M | 1.5% | -5.1% |
| FN FABRINET | Technology | 54.8K | $28.6M | 1.5% | +403.4% |
| ECO OKEANIS ECO TANKERS CORP | Industrials | 538.9K | $27.3M | 1.5% | +233.0% |
| TLN TALEN ENERGY CORP | Utilities | 81.6K | $26.0M | 1.4% | +8.8% |
| SMTC SEMTECH CORP | Technology | 332.3K | $25.6M | 1.4% | -34.7% |
| CNR CORE NATURAL RESOURCES INC | Materials | 237.0K | $24.8M | 1.3% | +82.0% |
| MUSA MURPHY USA INC | Consumer discretionary | 48.1K | $23.8M | 1.3% | New |
| BIIB BIOGEN INC | Healthcare | 118.5K | $21.7M | 1.2% | +39.4% |
| KRUS KURA SUSHI USA INC-CLASS A | Consumer discretionary | 301.2K | $21.0M | 1.1% | +57.9% |
| QLYS QUALYS INC | Technology | 239.0K | $21.0M | 1.1% | +361.0% |
| JBL JABIL INC | Technology | 77.2K | $20.5M | 1.1% | +9.2% |
| CRCL CIRCLE INTERNET GROUP INC | Financials | 213.8K | $20.4M | 1.1% | New |
| DHT DHT HOLDINGS INC | Industrials | 1.1M | $19.9M | 1.1% | New |
| ALNT ALLIENT INC | Technology | 323.5K | $19.1M | 1.0% | +7.1% |
| PRIM PRIMORIS SERVICES CORP | Industrials | 130.6K | $18.7M | 1.0% | +23.6% |
| DAVE DAVE INC | Financials | 105.4K | $18.4M | 1.0% | +139.6% |
| KTOS KRATOS DEFENSE & SECURITY | Industrials | 259.8K | $18.3M | 1.0% | -11.6% |
| MAMA MAMA'S CREATIONS INC | Consumer staples | 1.2M | $18.1M | 1.0% | -5.5% |
| ADEA ADEIA INC | Communications | 729.5K | $17.5M | 0.9% | +184.7% |
| UPWK UPWORK INC | Technology | 1.6M | $17.2M | 0.9% | +118.2% |
| PLSE PULSE BIOSCIENCES INC | Healthcare | 733.4K | $15.8M | 0.8% | +86.4% |
| PRCH PORCH GROUP INC | Technology | 2.1M | $15.4M | 0.8% | +3.0% |
| HAFN HAFNIA LTD | Industrials | 1.9M | $14.8M | 0.8% | New |
| MEC MAYVILLE ENGINEERING CO INC | Industrials | 821.1K | $14.7M | 0.8% | +60.1% |
| CADL CANDEL THERAPEUTICS INC | Healthcare | 2.9M | $14.2M | 0.8% | +70.7% |
| LASR NLIGHT INC | Technology | 225.6K | $12.9M | 0.7% | -61.8% |
| GENI GENIUS SPORTS LTD | Services media | 2.8M | $12.4M | 0.7% | -5.0% |
| AS AMER SPORTS INC | Other | 357.8K | $11.8M | 0.6% | New |
| EBAY EBAY INC | Services media | 126.1K | $11.5M | 0.6% | +116.9% |
| PKE PARK AEROSPACE CORP | Industrials | 410.7K | $11.2M | 0.6% | +67.6% |
| ENVA ENOVA INTERNATIONAL INC | Financials | 80.9K | $11.0M | 0.6% | -17.3% |
| RELY REMITLY GLOBAL INC | Services media | 698.2K | $10.9M | 0.6% | +11.2% |
| EVLV EVOLV TECHNOLOGIES HOLDINGS | Technology | 1.8M | $10.9M | 0.6% | New |
| WRBY WARBY PARKER INC-CLASS A | Healthcare | 500.7K | $10.5M | 0.6% | -59.4% |
13F filing history
| Period | Form | Filed | Entries | Reported value | Flags | Source |
|---|---|---|---|---|---|---|
| Q1 2026 | 13F-HR | May 15, 2026 | 144 | $1.88B | canonical | SEC ↗ |
| Q4 2025 | 13F-HR | Feb 17, 2026 | 155 | $1.87B | canonical | SEC ↗ |
| Q3 2025 | 13F-HR | Nov 13, 2025 | 119 | $1.85B | canonical | SEC ↗ |
| Q2 2025 | 13F-HR | Aug 13, 2025 | 118 | $1.59B | canonical | SEC ↗ |
| Q1 2025 | 13F-HR | May 15, 2025 | 109 | $1.32B | canonical | SEC ↗ |
| Q4 2024 | 13F-HR | Feb 13, 2025 | 131 | $1.49B | canonical | SEC ↗ |
| Q3 2024 | 13F-HR | Nov 14, 2024 | 129 | $1.38B | canonical | SEC ↗ |
| Q2 2024 | 13F-HR | Aug 14, 2024 | 117 | $1.21B | canonical | SEC ↗ |
| Q1 2024 | 13F-HR | May 15, 2024 | 116 | $1.31B | canonical | SEC ↗ |
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