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Portolan Capital Management, LLC

Institutional InvestorSimilar funds →SEC EDGAR: CIK 1350290
Institutional-grade research for retail investors

Sector Allocation

  • Technology44.4%$1.2B
  • Industrials17.5%$467.9M
  • Healthcare10.9%$290.8M
  • Financials9.9%$263.3M
  • Consumer Discretionary8.1%$216.9M
  • Materials2.7%$71.8M
  • Communication Services2.1%$57.2M
  • Utilities1.4%$36.1M
  • Consumer Staples1.1%$28.9M
  • Energy1.1%$28.0M

AUM History

13fpro.ai/research/fund/portolan-capital-management-llc-1350290

Conviction and streaks

Stable · top 10 = 29.0%

From the fund's last 12 quarters of 13F filings: positions held longest at size, and names it added to or trimmed several quarters running.

VPG$VPGConviction hold5.7% weight · held 7 quartersTTMI$TTMIConviction hold3.6% weight · held 10 quartersMOD$MODConviction hold3.1% weight · held 10 quartersFOUR$FOURConviction hold2.0% weight · held 10 quartersENVA$ENVAConviction hold1.8% weight · held 10 quartersFORR$FORRAccumulating+686% shares · 7 quarters runningVIRT$VIRTAccumulating+684% shares · 3 quarters runningUTHR$UTHRAccumulating+351% shares · 3 quarters runningALNT$ALNTAccumulating+40% shares · 3 quarters runningPRCH$PRCHAccumulating+60% shares · 3 quarters runningMETA$METATrimming-60% shares · 9 quarters runningKTOS$KTOSTrimming-96% shares · 5 quarters runningMAMA$MAMATrimming-55% shares · 4 quarters runningTTMI$TTMITrimming-57% shares · 3 quarters runningMOD$MODTrimming-48% shares · 3 quarters running

Largest positions — Q2 2026

Top 20 stock positions. Options are left out: 13F reports them at the underlying's value.

13fpro.ai/research/fund/portolan-capital-management-llc-1350290

Portolan Capital Management, LLC 13F holdings — Q2 2026

$2.7B portfolio (+42.1% QoQ) · 148 holdings · Q2 2026 13F · top 10 are 29% of the stock portfolio

All holdings — Portolan Capital Management, LLC (Q2 2026)

148 disclosed positions from the Form 13F-HR on SEC EDGAR, with quarter-over-quarter share changes. Largest by value first; the ten above are not repeated.

Company
UTHR$UTHRUNITED THERAPEUTICS Corp$44.2M+29%
GENI$GENIGenius Sports Ltd$42.6M+152%
POWL$POWLPOWELL INDUSTRIES INC$41.7M+92%
PENG$PENGPenguin Solutions, Inc.$41.5MNew
DAVE$DAVEDave Inc./DE$39.2M-0.1%
FLEX$FLEXFLEX LTD.$37.1M-48%
ALNT$ALNTALLIENT INC$37.0M+11%
PRCH$PRCHPorch Group, Inc.$36.9M+15%
AKAM$AKAMAKAMAI TECHNOLOGIES INC$36.7M-27%
CADL$CADLCandel Therapeutics, Inc.$36.0M+21%
TLN$TLNTalen Energy Corp$34.7M+11%
RRX$RRXREGAL REXNORD CORP$32.8M+155%
LNTH$LNTHLantheus Holdings, Inc.$32.0M-31%
BIIB$BIIBBIOGEN INC.$30.9M+21%
VECO$VECOVEECO INSTRUMENTS INC$30.4M+59%

What changed in Q2 2026

Against the previous quarter's 13F: 36 new, 50 added to, 58 trimmed, 32 sold out. Share-count changes; largest moves by dollar size first.

New positions (36)

  • PENG$PENGPenguin Solutions, Inc.$41.5M

    first bought this quarter

  • SRAD$SRADSportradar Group AG$27.2M

    first bought this quarter

  • BAND$BANDBandwidth Inc.$26.1M

    first bought this quarter

  • KTB$KTBKontoor Brands, Inc.$24.3M

    first bought this quarter

  • ECPG$ECPGENCORE CAPITAL GROUP INC$23.9M

    first bought this quarter

  • BB$BBBLACKBERRY Ltd$21.7M

    first bought this quarter

+30 more in the Excel export

Added to (50)

  • VIRT$VIRTVirtu Financial, Inc.+77%

    now $127.6M · held 3 qtrs, 3 adds in a row

  • FOUR$FOURShift4 Payments, Inc.+420%

    now $54.2M · held 10+ qtrs

  • QLYS$QLYSQUALYS, INC.+122%

    now $72.8M · held 3 qtrs, 3 adds in a row

  • ENVA$ENVAEnova International, Inc.+146%

    now $47.9M · held 10+ qtrs

  • GENI$GENIGenius Sports Ltd+152%

    now $42.6M · held 10+ qtrs

  • OSK$OSKOSHKOSH CORP+767%

    now $24.2M · held 3 qtrs

+44 more in the Excel export

Trimmed (58)

  • TTMI$TTMITTM TECHNOLOGIES INC-30%

    now $95.0M · held 10+ qtrs, 3 trims in a row

  • FLEX$FLEXFLEX LTD.-48%

    now $37.1M · held 10+ qtrs, 3 trims in a row

  • BIDU$BIDUBaidu, Inc.-74%

    now $11.0M · held 4 qtrs

  • FN$FNFabrinet-88%

    now $3.6M · held 5 qtrs

  • MOD$MODMODINE MANUFACTURING CO-24%

    now $83.8M · held 10+ qtrs, 3 trims in a row

  • CLS$CLSCELESTICA INC-36%

    now $46.3M · held 10+ qtrs

+52 more in the Excel export

Sold out (32)

  • PBF$PBFPBF Energy Inc.was $38.1M

    held 1 qtr

  • CRGY$CRGYCrescent Energy Cowas $35.1M

    held 2 qtrs

  • CNR$CNRCore Natural Resources, Inc.was $24.8M

    held 2 qtrs

  • MUSA$MUSAMurphy USA Inc.was $23.8M

    held 1 qtr

  • CRCL$CRCLCircle Internet Group, Inc.was $20.4M

    held 1 qtr

  • PRIM$PRIMPrimoris Services Corpwas $18.7M

+26 more in the Excel export

Firm AUM (Form ADV): $2.0B as of 2025-12-31 · SEC IAPD

Share

Holdings by quarter

Every 13F Portolan Capital Management, LLC has filed, 41 earlier quarters. Pick one to see what it held then.

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Is it too late to follow Portolan Capital Management?

Q2 2026 13F filed with the SEC on Aug 14, 2026. Prices are closing prices as of Oct 26, 2026.

Average quality of Portolan Capital Management's top 20 holdings: 59/100 (our AI quality score, weighted by position size; 17 of the 20 are scored)

Top 10 since filing

-21.1%

Value-weighted move of the 10 largest stock positions

Turnover

34%

Last quarter; 140% over the last 4

Top 10 weight

29%

Share of the stock portfolio in its 10 largest positions

Held 4+ quarters

53%

Share of portfolio value in positions held a year or more

Highest-quality names it owns(among its 100 largest positions)

The 8 highest-scoring companies in this portfolio are a Pro feature.

How these are measured
  • Moves since the quarter-end and since the filing date use our own daily closing prices, from the close on (or just before) each date to the latest close.
  • Turnover is the lesser of shares bought or sold in a quarter, valued at the quarter-end prices in the 13F, divided by the average of the two quarters' stock portfolio values.
  • Quarters held and add/trim streaks count back only through quarters whose filed holdings add up to the filing's own cover-page total (back to Q1 2024 for this fund). A change counts as an add or a trim when the split-adjusted share count moves by more than 1%.
  • Estimate, not the fund's reported cost. For each quarter in the current holding period in which the fund's share count rose (split-adjusted), we take that quarter's average daily close and weight it by the shares added; sales do not change an average cost. Quarters where the stock's price history and the 13F's own implied price disagree by more than 2x are left out.
  • Put and call option rows report the value of the underlying shares, not a position the fund paid for, so they are left out of all of the above.

Portfolio Overview

Portolan Capital Management, LLC disclosed 148 positions worth $2.7B in its Form 13F-HR for Q2 2026, led by $VPG (Vishay Precision Group, Inc.) at 5.7% of the equity portfolio, followed by $VIRT and $TTMI. During the quarter the fund opened 36 new positions and exited 32 — including a new stake in $PENG and a full exit from $PBF. The portfolio is most concentrated in Technology (44.4% of disclosed assets). All figures are sourced directly from Portolan Capital Management, LLC’s Form 13F-HR filing with the SEC under CIK 1350290.

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AI-Powered Hedge Fund Analysis: Portolan Capital Management, LLC

13F Pro is an AI hedge fund tracker and stock research platform. For Portolan Capital Management, LLC (SEC CIK: 1350290), the platform ingests every quarterly Form 13F filing and applies AI-powered analysis on top — 10 specialized AI analysts (value, growth, momentum, macro, activist, and more) debate the fund's top positions and publish AI-generated analysis with cited SEC sources.

Every holding in Portolan Capital Management, LLC's portfolio is scored on an AI quality ranking built from its SEC filings (ROIC, FCF margin, revenue growth, institutional flow, earnings quality, shareholder dilution, and more). Track accumulation and distribution quarter over quarter, identify conviction positions, and see AI stock analysis for each position — alongside 8,700+ other institutional filers and 2,800+ AI-ranked companies.