Portolan Capital Management, LLC

Hedge Fund • Long/Short

Portolan Capital Management, LLC is a Long/Short Hedge Fund based in Boston, MA led by George Frederic Mccabe, managing $1.8B across 119 long positions as of Q3 2025 with 36% Technology concentration.

CIOGeorge Frederic Mccabe

Portfolio Value: $1.8B
Positions: 119
Top Holding: MOD at 4.63%
Last Reported: Q3 2025

AddressTwo International Place, Suite 2630, Boston, MA, 02110, United States

Top Holdings

Largest long holdings in Portolan Capital Management, LLC's portfolio (31.6% of total portfolio)

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Holding	Sector	Position	Weight	Traded	Ownership	Owned Since
1 Modine Manufacturing MOD	Auto - Parts Consumer Cyclical	$85.6M	4.63%	+$15.7M Bought	1.15% 602.5K shares	Q4 2022 Held for 2y 11m
2 TTM Technologies TTMI	Hardware, Equipment & Parts Technology	$68.5M	3.71%	+$3.7M Bought	1.15% 1.2M shares	Q1 2024 Held for 1y 8m
3 e.l.f. Beauty ELF	Household & Personal Products Consumer Defensive	$64.6M	3.49%	+$2.7M Bought	0.86% 487.5K shares	Q3 2018 Held for 7y 2m
4 DigitalBridge Group DBRG	REIT - Diversified Real Estate	$64.0M	3.46%	+$27.9M Bought	3.00% 5.5M shares	Q3 2024 Held for 1y 2m
5 Celestica CLS	Hardware, Equipment & Parts Technology	$62.0M	3.35%	-$73.4M Sold	0.22% 251.6K shares	Q2 2023 Held for 2y 5m
6 Kratos Defense & Security Solutions KTOS	Aerospace & Defense Industrials	$54.5M	2.95%	-$66.9M Sold	0.35% 596.1K shares	Q2 2023 Held for 2y 5m
7 Semtech SMTC	Semiconductors Technology	$47.8M	2.59%	+$20.7M Bought	0.77% 668.9K shares	Q1 2024 Held for 1y 8m
8 AeroVironment AVAV	Aerospace & Defense Industrials	$46.6M	2.52%	-$9.7M Sold	0.30% 147.9K shares	Q2 2025 Held for 5 months
9 Powell Industries POWL	Electrical Equipment & Parts Industrials	$45.2M	2.45%	-$6.8M Sold	1.23% 148.2K shares	Q4 2024 Held for 11 months
10 Cellebrite DI Ltd. CLBT	Software - Infrastructure Technology	$44.8M	2.43%	+$26.1M Bought	0.99% 2.4M shares	Q1 2024 Held for 1y 8m

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Changes

Portfolio activity, position movements, and quarter-over-quarter changes in Portolan Capital Management, LLC's latest filing

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Market Value

$1.8B

Prior: $1.6B

Q/Q Change

+15.87%

+$253.1M

Net Flows % of MV

-9.49%

Turnover Ratio

34.0%

New Purchases

22 stocks

$201.0M

Added To

35 stocks

+$265.8M

Sold Out Of

40 stocks

$272.0M

Reduced Holdings

42 stocks

-$370.0M

Increased Positions

Position	Shares Δ	Change
1 nLIGHT, Inc. LASR	New	0 → 769.8K +$22.8M
2 Wolverine World Wide WWW	New	0 → 796.6K +$21.9M
3 First Solar FSLR	New	0 → 83.2K +$18.3M
4 Solaris Energy Infrastructure SEI	New	0 → 363.4K +$14.5M
5 Sphere Entertainment SPHR	New	0 → 208.4K +$12.9M

Decreased Positions

Position	Shares Δ	Change
1 SLM SLM	Sold	710.3K → 0 −$23.3M
2 Potbelly Corporation PBPB	Sold	1.7M → 0 −$20.4M
3 Ramaco Resources METC	Sold	1.4M → 0 −$18.6M
4 Align Technology ALGN	Sold	67.7K → 0 −$12.8M
5 Virtu Financial VIRT	Sold	273.4K → 0 −$12.2M