Q2 2026 13F · SEC CIK 1350290

Portolan Capital Management, LLC

Mutual fund managerFiled 2026-08-14 for Q2 2026. Open the filing ↗ · All SEC filings ↗

Reported 13F value: $2.7B
Reported positions: 148
Top holdings a year, 3 yrs: +36.2%
Assets under management: $2.0B

Portolan Capital Management, LLC is a mutual fund manager that reported 148 positions worth $2.7B in its Q2 2026 13F, filed 2026-08-14. Its largest holdings were Vishay Precision Group Inc (VPG, 5.7%), Virtu Finl Inc (VIRT, 4.8%), Ttm Technologies Inc (TTMI, 3.6%). A portfolio copying its top holdings returned 36.2% a year over the last 3 years, against 20.4% for the S&P 500.

Portolan Capital Management, LLC holdings largest 50 of 148 positions.

Weights are shares of the filer's total reported 13F value, compared with Q1 2026. Share changes may reflect splits; weight changes also reflect price moves. A 13F shows long US-listed positions only, up to 135 days after the fact.

Portolan Capital Management, LLC 13F holdings
Stock	% of 13F value	Q1 2026	Shares	Share change	Reported value
VPGVishay Precision Group Inc	5.7%	2.4%	1,008,167	-1.1%	$151.1M
VIRTVirtu Finl Inc	4.8%	2.8%	2,142,215	+76.8%	$127.6M
TTMITtm Technologies Inc	3.6%	3.8%	507,838	-30.2%	$95.0M
MODModine Manufacturing Co	3.1%	4.8%	313,683	-23.9%	$83.8M
QLYSQualys Inc	2.7%	1.1%	529,807	+121.7%	$72.8M
FOURShift4 Pmts Inc Cl A	2.0%	—	1,114,116	—	$54.2M
MECMayville Engr Co Inc	1.8%	0.8%	1,299,256	+58.2%	$48.7M
ENVAEnova Intl Inc	1.8%	0.6%	198,795	+145.7%	$47.9M
SMTCSemtech Corp	1.8%	1.4%	294,619	-11.3%	$47.7M
CLSCelestica Inc	1.7%	3.0%	126,856	-35.9%	$46.3M
UTHRUnited Therapeutics Corp Del	1.7%	2.0%	81,518	+28.5%	$44.2M
GENIGenius Sports Limited	1.6%	0.7%	7,025,809	+151.7%	$42.6M
POWLPowell Inds Inc	1.6%	2.2%	145,631	+92.0%	$41.7M
PENGPenguin Solutions Inc	1.6%	—	546,173	—	$41.5M
DAVEDave Inc	1.5%	1.0%	105,338	-0.1%	$39.2M
FLEXFlex Ltd Ord	1.4%	1.5%	229,027	-48.3%	$37.1M
ALNTAllient Inc	1.4%	1.0%	359,685	+11.2%	$37.0M
PRCHPorch Group Inc	1.4%	0.8%	2,456,451	+14.5%	$36.9M
AKAMAkamai Technologies Inc	1.4%	2.6%	310,361	-26.7%	$36.7M
CADLCandel Therapeutics Inc	1.3%	0.8%	3,490,398	+20.6%	$36.0M
TLNTalen Energy Corp	1.3%	1.4%	90,312	+10.7%	$34.7M
RRXRegal Rexnord Corporation	1.2%	—	137,498	—	$32.8M
LNTHLantheus Hldgs Inc	1.2%	1.7%	288,691	-30.8%	$32.0M
BIIBBiogen Inc	1.2%	1.2%	142,856	+20.6%	$30.9M
VECOVeeco Instrs Inc Del	1.1%	—	401,639	—	$30.4M
MYTELuxexperience BV	1.1%	1.6%	4,053,147	+8.5%	$30.1M
ZETAZeta Global Holdings Corp	1.1%	—	1,502,738	—	$29.6M
CLBTCellebrite Di Ltd	1.1%	1.6%	1,932,514	-11.4%	$28.2M
SRADSportradar Group AG	1.0%	—	1,819,949	—	$27.2M
GOOSCanada Goose Hldgs Inc	1.0%	1.9%	2,750,523	-14.5%	$26.2M
BANDBandwidth Inc	1.0%	—	412,701	—	$26.1M
WRBYWarby Parker Inc	1.0%	—	843,862	—	$25.6M
KTBKontoor Brands Inc Com	0.9%	—	292,115	—	$24.3M
OSKOshkosh Corp	0.9%	—	157,641	—	$24.2M
ECPGEncore Cap Group Inc	0.9%	—	255,715	—	$23.9M
TWLOTwilio Inc	0.9%	—	115,397	—	$23.8M
SEZLSezzle Inc.	0.9%	—	135,743	—	$23.3M
RELYRemitly Global Inc Com	0.9%	—	1,017,592	—	$22.8M
ACMRACM Research, Inc.	0.8%	—	177,432	—	$22.5M
ESIElement Solutions Inc	0.8%	—	469,213	—	$22.4M
NOKNokia Corp	0.8%	1.0%	1,645,761	-31.3%	$21.9M
BBBlackberry Ltd	0.8%	—	1,714,461	—	$21.7M
IFFInternational Flavors&fragra	0.8%	—	269,229	—	$21.3M
PLSEPulse Biosciences Inc	0.8%	0.8%	753,333	+2.7%	$20.9M
MOG-AMoog Inc	0.8%	—	49,274	—	$20.9M
REAXThe Real Brokerage Inc.	0.8%	1.9%	11,042,364	-23.9%	$20.1M
CDNACareDx, Inc.	0.7%	—	684,805	—	$19.5M
PARRPar Pac Holdings Inc	0.7%	2.3%	341,863	-50.7%	$19.2M
VSHVishay Intertechnology Inc	0.7%	—	351,515	—	$18.9M
TTWOTake-Two Interactive Softwar	0.7%	—	72,487	—	$18.1M

What Portolan Capital Management, LLC bought and sold in Q2 2026, against Q1 2026.

New positions

Q1 2026's filing was too long to tell new positions apart.

Added to

GENI Genius Sports Limited+151.7% shares
ENVA Enova Intl Inc+145.7% shares
QLYS Qualys Inc+121.7% shares
POWL Powell Inds Inc+92.0% shares
VIRT Virtu Finl Inc+76.8% shares
MEC Mayville Engr Co Inc+58.2% shares
UTHR United Therapeutics Corp Del+28.5% shares
CADL Candel Therapeutics Inc+20.6% shares

Reduced

PARR Par Pac Holdings Inc-50.7% shares
FLEX Flex Ltd Ord-48.3% shares
CLS Celestica Inc-35.9% shares
NOK Nokia Corp-31.3% shares
LNTH Lantheus Hldgs Inc-30.8% shares
TTMI Ttm Technologies Inc-30.2% shares
AKAM Akamai Technologies Inc-26.7% shares
REAX The Real Brokerage Inc.-23.9% shares

Left the top 50

Share counts compared with the Q1 2026 13F; a split also changes share counts. The latest filing lists more than 50 positions, so a position that left the top 50 may still be held.

How the holdings did against the S&P 500.

1 year: +37.6% /yr; S&P 500 +20.1%
3 years: +36.2% /yr; S&P 500 +20.4%
5 years: +18.3% /yr; S&P 500 +11.6%

A portfolio of the filer's 20 largest 13F positions, weighted by value, bought the trading day after each 13F was filed and held until the next one was: what copying this filer could have earned. 13Fs show long US-listed positions only, so this is an estimate of the stock picks, not the fund's reported returns.

Reported 13F value by quarter.

13F value by quarter
Quarter	13F value	Positions
Q2 2026	$2.7B	148
Q1 2026	$1.9B	144
Q4 2025	$1.9B	155
Q3 2025	$1.8B	119
Q2 2025	$1.6B	118
Q1 2025	$1.3B	109
Q4 2024	$1.5B	131
Q3 2024	$1.4B	129
Q2 2024	$1.2B	117
Q1 2024	$1.3B	116
Q4 2023	$1.1B	127
Q3 2023	$1.1B	123

Questions about Portolan Capital Management, LLC's portfolio

What stocks does Portolan Capital Management, LLC own?

Portolan Capital Management, LLC's latest 13F, for Q2 2026 and filed Aug 14, 2026, lists 148 positions worth $2.7B. The largest are Vishay Precision Group Inc (VPG) at 5.7%, Virtu Finl Inc (VIRT) at 4.8%, Ttm Technologies Inc (TTMI) at 3.6%, Modine Manufacturing Co (MOD) at 3.1% and Qualys Inc (QLYS) at 2.7%.

What did Portolan Capital Management, LLC buy last quarter?

In Q2 2026, Portolan Capital Management, LLC added Genius Sports Limited (GENI) (+151.7% shares), Enova Intl Inc (ENVA) (+145.7% shares) and Qualys Inc (QLYS) (+121.7% shares), compared with its Q1 2026 filing.

What did Portolan Capital Management, LLC sell last quarter?

In Q2 2026, Portolan Capital Management, LLC cut from its top 50 Baidu Inc (BIDU), cut from its top 50 Pbf Energy Inc (PBF), cut from its top 50 Crescent Energy Company (CRGY), cut from its top 50 Castle Biosciences Inc (CSTL), cut from its top 50 Fabrinet (FN), Par Pac Holdings Inc (PARR) (-50.7% shares), Flex Ltd Ord (FLEX) (-48.3% shares) and Celestica Inc (CLS) (-35.9% shares), compared with its Q1 2026 filing.

How has Portolan Capital Management, LLC's portfolio performed?

A portfolio copying Portolan Capital Management, LLC's 20 largest 13F holdings each quarter, from the day each filing was public, returned +36.2% a year over the last 3 years, against +20.4% for the S&P 500. Over 1 year: +37.6% against +20.1%. Over 5 years: +18.3% a year against +11.6%.

When is Portolan Capital Management, LLC's next 13F filing due?

13F filings are due 45 days after each quarter ends. Portolan Capital Management, LLC's filing for the quarter ending Sep 30, 2026 is due by Nov 14, 2026; this page updates the day after it is published.

How much money does Portolan Capital Management, LLC manage?

Portolan Capital Management, LLC reported $2.0B of regulatory assets under management on its latest SEC Form ADV. Its 13F, which covers only US-listed stocks and options, totals $2.7B.