Portolan Capital Management, LLC

BOSTON, MA · CIK 1350290 · 13F filing filed 2026-08-14

No investment adviser registration (Form ADV) found for this filer. It may be a parent company whose subsidiaries are the registered advisers, a bank or insurer, or a manager based outside the US.

Legal entityPORTOLAN CAPITAL MANAGEMENT, LLC (US)

$2.7bn reported value +42.1% vs Q1 2026

148positions

29.0%in top 10

36 new 49 added 59 reduced 32 sold out vs Q1 2026

Holdings, Q2 2026

The small lines show how much was held over the last 4 quarters (adjusted for stock splits).

#	Security	Ticker	Shares	Value	% of portfolio	Change	Shares change
1	VISHAY PRECISION GROUP INC COM VPG	VPG	1,008,167	$151.1m5.66%	5.66%	Reduced -11.7k	-11,701 -1.1%
2	VIRTU FINL INC CL A VIRT	VIRT	2,142,215	$127.6m4.78%	4.78%	Added +930.3k	+930,328 76.8%
3	TTM TECHNOLOGIES INC COM TTMI	TTMI	507,838	$95.0m3.56%	3.56%	Reduced -219.7k	-219,656 -30.2%
4	MODINE MFG CO COM MOD	MOD	313,683	$83.8m3.14%	3.14%	Reduced -98.4k	-98,409 -23.9%
5	QUALYS INC COM QLYS	QLYS	529,807	$72.8m2.73%	2.73%	Added +290.8k	+290,779 121.7%
6	SHIFT4 PMTS INC CL A FOUR	FOUR	1,114,116	$54.2m2.03%	2.03%	Added +899.8k	+899,832 419.9%
7	MAYVILLE ENGR CO INC COM MEC	MEC	1,299,256	$48.7m1.82%	1.82%	Added +478.1k	+478,120 58.2%
8	ENOVA INTL INC COM ENVA	ENVA	198,795	$47.9m1.79%	1.79%	Added +117.9k	+117,872 145.7%
9	SEMTECH CORP COM SMTC	SMTC	294,619	$47.7m1.79%	1.79%	Reduced -37.7k	-37,708 -11.3%
10	CELESTICA INC COM CLS	CLS	126,856	$46.3m1.73%	1.73%	Reduced -71.0k	-71,007 -35.9%
11	UNITED THERAPEUTICS CORP DEL COM UTHR	UTHR	81,518	$44.2m1.65%	1.65%	Added +18.1k	+18,083 28.5%
12	GENIUS SPORTS LIMITED SHARES CL A GENI	GENI	7,025,809	$42.6m1.59%	1.59%	Added +4.2m	+4,234,791 151.7%
13	POWELL INDS INC COM POWL	POWL	145,631	$41.7m1.56%	1.56%	Reduced -81.9k	-81,859 -36.0%
14	PENGUIN SOLUTIONS INC COM PENG	PENG	546,173	$41.5m1.55%	1.55%	New
15	DAVE INC CLASS A COM NEW DAVE	DAVE	105,338	$39.2m1.47%	1.47%	Reduced -104	-104 -0.1%
16	FLEX LTD ORD FLEX	FLEX	229,027	$37.1m1.39%	1.39%	Reduced -214.1k	-214,101 -48.3%
17	ALLIENT INC COM ALNT	ALNT	359,685	$37.0m1.39%	1.39%	Added +36.2k	+36,232 11.2%
18	PORCH GROUP INC COM PRCH	PRCH	2,456,451	$36.9m1.38%	1.38%	Added +311.6k	+311,561 14.5%
19	AKAMAI TECHNOLOGIES INC COM AKAM	AKAM	310,361	$36.7m1.37%	1.37%	Reduced -113.1k	-113,081 -26.7%
20	CANDEL THERAPEUTICS INC COM CADL	CADL	3,490,398	$36.0m1.35%	1.35%	Added +596.1k	+596,073 20.6%
21	TALEN ENERGY CORP COM TLN	TLN	90,312	$34.7m1.30%	1.30%	Added +8.7k	+8,738 10.7%
22	REGAL REXNORD CORPORATION COM RRX	RRX	137,498	$32.8m1.23%	1.23%	Added +83.5k	+83,523 154.7%
23	LANTHEUS HLDGS INC COM LNTH	LNTH	288,691	$32.0m1.20%	1.20%	Reduced -128.7k	-128,699 -30.8%
24	BIOGEN INC COM BIIB	BIIB	142,856	$30.9m1.16%	1.16%	Added +24.4k	+24,375 20.6%
25	VEECO INSTRS INC DEL COM VECO	VECO	401,639	$30.4m1.14%	1.14%	Added +148.3k	+148,260 58.5%
26	LUXEXPERIENCE BV ADS LUXE	LUXE	4,053,147	$30.1m1.13%	1.13%	Added +319.2k	+319,204 8.6%
27	ZETA GLOBAL HOLDINGS CORP CL A ZETA	ZETA	1,502,738	$29.6m1.11%	1.11%	Added +1.0m	+1,016,467 209.0%
28	CELLEBRITE DI LTD ORDINARY SHARES CLBT	CLBT	1,932,514	$28.2m1.06%	1.06%	Reduced -248.4k	-248,410 -11.4%
29	SPORTRADAR GROUP AG CLASS A ORD SHS SRAD	SRAD	1,819,949	$27.2m1.02%	1.02%	New
30	CANADA GOOSE HLDGS INC SHS SUB VTG GOOS	GOOS	2,750,523	$26.2m0.98%	0.98%	Reduced -467.8k	-467,754 -14.5%
31	BANDWIDTH INC COM CL A BAND	BAND	412,701	$26.1m0.98%	0.98%	New
32	WARBY PARKER INC CL A COM WRBY	WRBY	843,862	$25.6m0.96%	0.96%	Added +343.2k	+343,156 68.5%
33	KONTOOR BRANDS INC COM KTB	KTB	292,115	$24.3m0.91%	0.91%	New
34	OSHKOSH CORP COM OSK	OSK	157,641	$24.2m0.91%	0.91%	Added +139.5k	+139,456 766.9%
35	ENCORE CAP GROUP INC COM ECPG	ECPG	255,715	$23.9m0.89%	0.89%	New
36	TWILIO INC CL A TWLO	TWLO	115,397	$23.8m0.89%	0.89%	Added +40.6k	+40,628 54.3%
37	SEZZLE INC COM SEZL	SEZL	135,743	$23.3m0.87%	0.87%	Added +65.7k	+65,697 93.8%
38	REMITLY GLOBAL INC COM RELY	RELY	1,017,592	$22.8m0.85%	0.85%	Added +319.4k	+319,426 45.8%
39	ACM RESH INC COM CL A ACMR	ACMR	177,432	$22.5m0.84%	0.84%	Added +94.2k	+94,176 113.1%
40	ELEMENT SOLUTIONS INC COM ESI	ESI	469,213	$22.4m0.84%	0.84%	Added +248.0k	+247,981 112.1%
41	NOKIA CORP SPONSORED ADR NOK	NOK	1,645,761	$21.9m0.82%	0.82%	Reduced -748.2k	-748,209 -31.2%
42	BLACKBERRY LTD COM BB	BB	1,714,461	$21.7m0.81%	0.81%	New
43	INTERNATIONAL FLAVORS&FRAGRA COM IFF	IFF	269,229	$21.3m0.80%	0.80%	New
44	PULSE BIOSCIENCES INC COM PLSE	PLSE	753,333	$20.9m0.78%	0.78%	Added +20.0k	+19,961 2.7%
45	MOOG INC CL A MOG.A	MOG.A	49,274	$20.9m0.78%	0.78%	Added +19.8k	+19,837 67.4%
46	THE REAL BROKERAGE INC COM NEW COM NEW		11,042,364	$20.1m0.75%	0.75%	Reduced -3.5m	-3,477,484 -23.9%
47	CAREDX INC COM CDNA	CDNA	684,805	$19.5m0.73%	0.73%	Added +344.5k	+344,453 101.2%
48	PAR PAC HOLDINGS INC COM NEW PARR	PARR	341,863	$19.2m0.72%	0.72%	Reduced -352.0k	-351,971 -50.7%
49	VISHAY INTERTECHNOLOGY INC COM VSH	VSH	351,515	$18.9m0.71%	0.71%	New
50	TAKE-TWO INTERACTIVE SOFTWAR COM TTWO	TTWO	72,487	$18.1m0.68%	0.68%	Added +40.3k	+40,268 125.0%
51	GATES INDL CORP PLC ORD SHS 9666678D	9666678D	641,587	$17.9m0.67%	0.67%	New
52	MAMAS CREATIONS INC COM MAMA	MAMA	984,869	$17.6m0.66%	0.66%	Reduced -192.1k	-192,067 -16.3%
53	KURA SUSHI USA INC CL A COM KRUS	KRUS	302,010	$17.4m0.65%	0.65%	Added +798	+798 0.3%
54	SANMINA CORPORATION COM SANM	SANM	68,255	$17.3m0.65%	0.65%	Added +40.9k	+40,923 149.7%
55	PARK AEROSPACE CORP COM PKE	PKE	447,390	$17.1m0.64%	0.64%	Added +36.7k	+36,735 8.9%
56	GRAHAM CORP COM GHM	GHM	136,925	$16.9m0.63%	0.63%	Added +33.4k	+33,369 32.2%
57	BEL FUSE INC CL B BELFB	BELFB	47,856	$15.9m0.60%	0.60%	Reduced -5.3k	-5,314 -10.0%
58	ON HLDG AG NAMEN AKT A ONON	ONON	441,137	$15.6m0.59%	0.59%	Added +238.7k	+238,693 117.9%
59	AMER SPORTS INC COM SHS AS	AS	452,880	$15.3m0.57%	0.57%	Added +95.1k	+95,054 26.6%
60	COHU INC COM COHU	COHU	206,120	$15.2m0.57%	0.57%	New
61	JABIL INC COM JBL	JBL	38,929	$15.0m0.56%	0.56%	Reduced -38.3k	-38,268 -49.6%
62	ADEIA INC COM ADEA	ADEA	443,060	$14.6m0.55%	0.55%	Reduced -286.4k	-286,401 -39.3%
63	VICOR CORP COM VICR	VICR	38,081	$14.5m0.54%	0.54%	Added +11.4k	+11,411 42.8%
64	TENABLE HLDGS INC COM TENB	TENB	387,923	$14.3m0.54%	0.54%	New
65	GE HEALTHCARE TECHNOLOGIES I COMMON STOCK GEHC	GEHC	222,393	$14.2m0.53%	0.53%	New
66	CRANE NXT CO COM CXT	CXT	271,524	$13.9m0.52%	0.52%	New
67	RANPAK HOLDINGS CORP COM CL A PACK	PACK	1,894,855	$13.9m0.52%	0.52%	Reduced -52.8k	-52,826 -2.7%
68	ONTO INNOVATION INC COM ONTO	ONTO	36,503	$13.8m0.52%	0.52%	Added +14.2k	+14,240 64.0%
69	GENEDX HOLDINGS CORP COM CL A WGS	WGS	200,315	$13.8m0.51%	0.51%	Added +97.7k	+97,740 95.3%
70	FORRESTER RESH INC COM FORR	FORR	1,623,925	$13.7m0.51%	0.51%	Added +82.6k	+82,649 5.4%
71	MARINEMAX INC COM HZO	HZO	344,358	$12.6m0.47%	0.47%	New
72	BIO RAD LABS INC CL A BIO	BIO	42,620	$12.5m0.47%	0.47%	Added +28.4k	+28,447 200.7%
73	QUANTUM CORP COM QMCO	QMCO	1,020,120	$11.2m0.42%	0.42%	New
74	BAIDU INC SPON ADR REP A BIDU	BIDU	95,863	$11.0m0.41%	0.41%	Reduced -270.6k	-270,566 -73.8%
75	FERRARI N V COM RACE	RACE	29,079	$10.8m0.41%	0.41%	New
76	DIGI INTL INC COM DGII	DGII	141,243	$10.6m0.40%	0.40%	Reduced -29.0k	-29,013 -17.0%
77	NLIGHT INC COM LASR	LASR	151,867	$10.6m0.40%	0.40%	Reduced -73.7k	-73,709 -32.7%
78	VIAVI SOLUTIONS INC COM VIAV	VIAV	220,118	$10.5m0.39%	0.39%	Added +74.3k	+74,274 50.9%
79	BOOT BARN HLDGS INC COM BOOT	BOOT	63,759	$10.5m0.39%	0.39%	New
80	LIGHTPATH TECHNOLOGIES INC COM CL A LPTH	LPTH	629,168	$10.3m0.39%	0.39%	Reduced -411.3k	-411,294 -39.5%
81	FREQUENCY ELECTRS INC COM FEIM	FEIM	152,818	$10.1m0.38%	0.38%	Added +2.7k	+2,677 1.8%
82	HALOZYME THERAPEUTICS INC COM HALO	HALO	127,498	$10.0m0.37%	0.37%	New
83	OKEANIS ECO TANKERS COR SHS ECO	ECO	195,997	$9.8m0.37%	0.37%	Reduced -342.9k	-342,863 -63.6%
84	ERMENEGILDO ZEGNA N V ORD SHS ZGN	ZGN	753,948	$9.8m0.37%	0.37%	Added +43.3k	+43,322 6.1%
85	SWEETGREEN INC COM CL A SG	SG	1,029,016	$9.1m0.34%	0.34%	New
86	TAPESTRY INC COM TPR	TPR	61,688	$9.0m0.34%	0.34%	Added +44.6k	+44,650 262.1%
87	SOLARIS ENERGY INFRAS INC COM CL A SEI	SEI	107,401	$8.6m0.32%	0.32%	Added +79.5k	+79,471 284.5%
88	A10 NETWORKS INC COM ATEN	ATEN	226,920	$8.5m0.32%	0.32%	New
89	AMBARELLA INC SHS AMBA	AMBA	97,072	$8.3m0.31%	0.31%	Reduced -11.7k	-11,677 -10.7%
90	TECNOGLASS INC ORD SHS TGLS	TGLS	176,254	$8.3m0.31%	0.31%	New
91	QUANTERIX CORP COM QTRX	QTRX	1,899,308	$8.2m0.31%	0.31%	Reduced -1.0m	-1,046,515 -35.5%
92	TECOGEN INC NEW COM NEW TGEN	TGEN	1,551,113	$8.1m0.30%	0.30%	Added +1.1m	+1,107,558 249.7%
93	HEALTHEQUITY INC COM HQY	HQY	89,274	$8.1m0.30%	0.30%	Reduced -12.4k	-12,372 -12.2%
94	TOWER SEMICONDUCTOR LTD SHS NEW TSEM	TSEM	30,557	$8.0m0.30%	0.30%	Reduced -1.5k	-1,486 -4.6%
95	CASTLE BIOSCIENCES INC COM CSTL	CSTL	328,818	$7.8m0.29%	0.29%	Reduced -1.0m	-1,021,465 -75.7%
96	SILICOM LTD ORD SILC	SILC	162,466	$7.8m0.29%	0.29%	New
97	CIENA CORP COM NEW CIEN	CIEN	15,272	$7.5m0.28%	0.28%	Reduced -3.2k	-3,194 -17.3%
98	EBAY INC. COM EBAY	EBAY	65,741	$7.3m0.28%	0.28%	Reduced -60.4k	-60,355 -47.9%
99	RB GLOBAL INC COM RBA	RBA	63,009	$7.3m0.27%	0.27%	New
100	XOMETRY INC CLASS A COM XMTR	XMTR	73,163	$7.1m0.26%	0.26%	New

Sold out since Q1 2026

Security	Ticker	Shares held before	Value then
PBF ENERGY INC PBF	PBF	799,998	$38.1m800.0k shares
CRESCENT ENERGY COMPANY CRGY	CRGY	2,601,142	$35.1m2.6m shares
CORE NATURAL RESOURCES INC CNR	CNR	237,036	$24.8m237.0k shares
MURPHY USA INC MUSA	MUSA	48,107	$23.8m48.1k shares
CIRCLE INTERNET GROUP INC CRCL	CRCL	213,796	$20.4m213.8k shares
PRIMORIS SVCS CORP PRIM	PRIM	130,626	$18.7m130.6k shares
UPWORK INC UPWK	UPWK	1,570,560	$17.2m1.6m shares
REPAY HLDGS CORP RPAY	RPAY	2,856,178	$7.4m2.9m shares
AXCELIS TECHNOLOGIES INC ACLS	ACLS	77,168	$7.2m77.2k shares
VNET GROUP INC VNET	VNET	825,490	$6.9m825.5k shares
NORTHERN OIL & GAS INC NOG	NOG	204,244	$6.0m204.2k shares
BLACKLINE INC BL	BL	159,026	$5.9m159.0k shares
CENTURY ALUM CO CENX	CENX	95,039	$5.6m95.0k shares
MIAMI INTL HLDGS INC MIAX	MIAX	128,819	$5.0m128.8k shares
AEROVIRONMENT INC AVAV	AVAV	26,880	$4.9m26.9k shares
XPENG INC XPEV	XPEV	275,432	$4.7m275.4k shares
PERSONALIS INC PSNL	PSNL	736,713	$4.7m736.7k shares
I3 VERTICALS INC IIIV	IIIV	207,274	$4.6m207.3k shares
PROPETRO HLDG CORP PUMP	PUMP	314,815	$4.5m314.8k shares
FORGENT POWER SOLUTIONS INC FPS	FPS	117,933	$3.5m117.9k shares
DRAGANFLY INC. DPRO	DPRO	682,730	$3.4m682.7k shares
GREEN DOT CORP GDOT	GDOT	298,697	$3.4m298.7k shares
SPROUT SOCIAL INC SPT	SPT	558,350	$3.2m558.4k shares
EXZEO GROUP INC XZO	XZO	209,885	$3.1m209.9k shares
AMPLITUDE INC AMPL	AMPL	359,593	$2.5m359.6k shares

Stakes above 5%

Companies where this manager has reported owning more than 5% of a class of shares, on Schedule 13D (may seek influence) or 13G (passive): its latest filing for each, from 19 Dec 2024 on.

Company	Ticker	Stake	Change	Schedule	Last filed
VISHAY PRECISION GROUP INC VPG · 13G · filed 2026-05-15	VPG	8.3%≈ $152.9m	+1.6 pts	13G	2026-05-15
FORRESTER RESH INC FORR · 13G · filed 2026-05-15	FORR	7.9%≈ $13.0m	+1.8 pts	13G	2026-05-15
CANADA GOOSE HLDGS INC GOOS · 13G · filed 2026-01-16	GOOS	6.3%≈ $27.6m	new	13G	2026-01-16
OPEN LENDING CORP LPRO · 13G · filed 2026-02-26	LPRO	5.9%≈ $21.8m	new	13G	2026-02-26
MAYVILLE ENGR CO INC MEC · 13G · filed 2026-05-28	MEC	5.9%≈ $54.9m	new	13G	2026-05-28
POTBELLY CORP PBPB · 13G · filed 2025-06-27	PBPB	5.5%	new	13G	2025-06-27
TECOGEN INC NEW TGEN · 13G · filed 2026-06-10	TGEN	5.2%≈ $8.1m	new	13G	2026-06-10
LANTRONIX INC LTRX · 13G · filed 2026-10-13	LTRX	5.2%≈ $14.1m	new	13G	2026-10-13
THE REAL BROKERAGE INC 13G · filed 2026-08-14		5.1%≈ $20.1m	-1.7 pts	13G	2026-08-14
SILICOM LTD SILC · 13G · filed 2026-09-30	SILC	5.1%≈ $13.8m	new	13G	2026-09-30