Stocks/Funds/CIK 1350290

Portolan Capital Management, LLC

long-term holder
Quarterly 13F filings · Latest period 2026-03-31 · CIK 1350290
Assets
$1.88B
+42.8% YoY
Holdings
144
Lifetime alpha vs market
+4.93% annual
Average hold time
2.0 yr
median 1.5 yr

Quarterly history

Cum return +84% vs S&P +52% · α +32% lifetimeAUM $1.9B · peak $1.9BFlow $7M (+0%)2016-062017-122019-062020-122022-062023-122025-062026-03
AUM ($B)fundS&P 500(gap = α)/ Flow in/out

Behavior signals (lifetime)

Dip response
-14.05%
trims when stocks drop
when a holding falls −10%+
Middle response
-13.44%
baseline attrition
Rally response
-9.88%
trims into rallies
when a holding rises +10%+

Top positions · 30

Ticker$ value% portYoYHold time
MODModine Manufacturing Com$89M4.8%+182.4%3.5 yr
TTMITTM Technologies, Inc.$71M3.8%+375.0%2.3 yr
CLSCelestica Inc.$56M3.0%+257.4%2.0 yr
VIRTVirtu Financial, Inc.$53M2.8%+18.2%1.5 yr
AKAMAkamai Technologies, Inc$49M2.6%+42.7%2.3 yr
VPGVishay Precision Group, $44M2.4%+80.2%1.5 yr
PARRPar Pacific Holdings, In$43M2.3%+339.3%1.0 yr
POWLPowell Industries, Inc.$41M2.2%+6.3%1.5 yr
BIDUBaidu, Inc.$41M2.2%+21.1%3.3 yr
PBFPBF Energy Inc.$38M2.0%+159.4%2.8 yr
UTHRUnited Therapeutics Corp$38M2.0%+92.4%6.5 yr
REAXThe Real Brokerage Inc.$36M1.9%-38.4%1.3 yr
GOOSCanada Goose Holdings In$35M1.9%+38.0%1.3 yr
CRGYCrescent Energy Company$35M1.9%+26.2%0.5 yr
CSTLCastle Biosciences, Inc.$33M1.8%+22.6%5.8 yr

Portfolio composition (YoY)

Industry mix
Hardware, Equipment & Parts16.0%+8.8pp$301M
Software - Infrastructure7.7%+0.1pp$144M
Auto - Parts5.1%+2.2pp$95M
Oil & Gas Refining & Marketing4.3%$82M
Financial - Capital Markets4.2%+3.1pp$79M
Semiconductors4.1%+4.0pp$78M
Internet Content & Information3.2%-3.9pp$61M
Unknown3.1%+2.6pp$57M
Biotechnology3.0%+0.5pp$57M
Software - Application2.8%-2.3pp$53M
Country
US75.6%-9.3pp
CA7.0%+4.3pp
Unknown3.1%+2.6pp
CN3.0%+2.0pp
SG2.3%+1.6pp
IL2.1%+0.5pp
DE1.6%+0.1pp
KY1.5%
Top 5: 16.9% · Top 10: 28.0% · Top 25: 52.1%

Winners

TickerPrev $PnLYoY %
CLS$31M+0.08B257.4%
TTMI$21M+0.08B375.0%
MOD$38M+0.07B182.4%
VPG$20M+0.02B80.2%
UTHR$14M+0.01B92.4%

Losers

TickerPrev $PnLYoY %
LNTH$85M-0.02B-22.3%
CLBT$19M-0.01B-29.1%
REAX$4M-0.00B-38.4%

Top buys this quarter · 15

VIRT Virtu Financial, Inc.+$37M
CRGY Crescent Energy Company+$35M
PBF PBF Energy Inc.+$31M
PARR Par Pacific Holdings, Inc.+$28M
MUSA Murphy USA Inc.new+$24M
FN Fabrinet+$23M
CRCL Circle Internet Groupnew+$20M
QLYS Qualys, Inc.+$16M
UTHR United Therapeutics Corporatio+$16M
HAFN Hafnia Limitednew+$15M

Top sells this quarter · 15

TTMI TTM Technologies, Inc.$41M
MOD Modine Manufacturing Company$72M
CENX Century Aluminum Company$23M
LASR nLIGHT, Inc.$21M
SPHR Sphere Entertainment Co.exit$21M
TSEM Tower Semiconductor Ltd.$20M
FAF First American Financial Corpoexit$19M
FCX Freeport-McMoRan Inc.exit$17M
AAOI Applied Optoelectronics, Inc.$17M
FSLR First Solar, Inc.exit$16M

Quarterly history (TTM returns)

PeriodAUM# PosReturn (1yr)SPY (1yr)Alpha (1yr)Flow
2026-03-31$1.88B144+45.23%+17.59%+27.64%+0.01B
2025-12-31$1.87B155+25.76%+17.72%+8.04%+0.01B
2025-09-30$1.85B119+34.15%+17.52%+16.64%-0.11B
2025-06-30$1.59B118+23.13%+14.94%+8.18%+0.05B
2025-03-31$1.32B109+3.96%+8.30%-4.34%+0.02B
2024-12-31$1.49B131+36.40%+24.89%+11.51%+0.01B
2024-09-30$1.38B129+33.52%+36.04%-2.52%+0.01B
2024-06-30$1.21B117+27.26%+24.49%+2.77%-0.08B
2024-03-31$1.31B115+40.98%+29.62%+11.35%+0.00B
2023-12-31$1.14B127+34.45%+26.18%+8.27%+0.02B
2023-09-30$1.07B123+33.70%+21.57%+12.14%-0.14B
2023-06-30$1.13B120+20.23%+19.42%+0.81%-0.02B
2023-03-31$1.05B139-13.34%-7.82%-5.53%-0.05B
2022-12-31$1.01B131+4.29%+7.56%-3.27%+0.02B
2022-09-30$946M128-3.49%-4.93%+1.44%-0.01B
2022-06-30$993M123-20.76%-16.11%-4.65%-0.00B