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Institutional

Portolan Capital Management, LLC

CIK 0001350290
$1.88B
Reported AUM
144
Positions
Q1 2026
Period
2026-05-15
Filed

The Brief · Portolan Capital Management, LLC · Q1 2026

AI · grounded in 13F

Portolan Capital Management, LLC initiated a new position in PARR valued at $43.5M. The fund also established new stakes in PBF for $38.1M and MUSA for $23.8M. On the sell side, the manager closed its positions in FSLR and FAF, reducing exposure by $20.6M and $19.7M respectively.

Portfolio · Q1 2026

MODTTMICLSVIRTAKAMVPGPARRPOWLBIDUPBFUTHROther$1.28BPL

Top holdings

QoQ vs Q4 2025

#StockIssuerPriceDay %1Y Gr.5Y Gr.Value% of bookΔ shares (QoQ)Status
1MODMODINE MFG CO$282.232.07%195.35%1552.78%$89.3M4.75%123,855−23.1%
2TTMITTM TECHNOLOGIES INC$167.62-9.32%404.58%1098.14%$70.9M3.77%419,188−36.6%
3CLSCELESTICA INC$371.71-12.61%207.89%4090.64%$55.7M2.97%+25,588+14.9%
4VIRTVIRTU FINL INC$53.021.61%27.58%143.22%$53.3M2.84%+835,604+222.1%
5AKAMAKAMAI TECHNOLOGIES INC$149.32-6.08%93.85%24.52%$48.6M2.59%100,879−19.2%
6VPGVISHAY PRECISION GROUP INC$117.38-0.11%319.38%223.45%$44.3M2.36%+142,199+16.2%
7PARRPAR PAC HOLDINGS INC$55.660.20%158.88%239.80%$43.5M2.31%+693,834NEW
8POWLPOWELL INDS INC$295.963.89%348.68%3111.89%$41.0M2.18%3,286−4.2%
9BIDUBAIDU INC$121.880.18%41.78%-25.82%$40.8M2.17%+102,748+39.0%
10PBFPBF ENERGY INC$43.903.28%139.48%417.10%$38.1M2.03%+799,998NEW
11UTHRUNITED THERAPEUTICS CORP DEL$549.870.40%68.76%202.24%$37.6M2.00%+26,682+72.6%
12REAXTHE REAL BROKERAGE INC$1.743.27%-60.00%-6.67%$36.3M1.93%+3,740,005+34.7%
13GOOSCANADA GOOSE HLDGS INC$9.780.00%-14.06%-76.95%$35.3M1.88%+1,079,373+50.5%
14CRGYCRESCENT ENERGY COMPANY$11.771.99%33.71%6.07%$35.1M1.87%+2,561,242+6419.2%
15CSTLCASTLE BIOSCIENCES INC$20.25-3.62%8.00%-71.01%$33.1M1.76%379,180−21.9%
16LNTHLANTHEUS HLDGS INC$102.261.27%23.83%285.86%$31.7M1.68%58,399−12.3%
17CLBTCELLEBRITE DI LTD$13.65-1.16%-16.45%38.93%$30.1M1.60%+893,637+69.4%
18LUXELUXEXPERIENCE BV$7.45-0.33%-20.43%-72.63%$29.9M1.59%+1,073,269+40.3%
19FLEXFLEXTRONICS INTL LTD$152.240.21%252.73%1021.86%$29.0M1.54%23,785−5.1%
20FNFABRINET$621.25-13.09%164.42%557.27%$28.6M1.52%+43,885+403.4%
21ECOOKEANIS ECO TANKERS COR$47.36-0.79%136.92%131.27%$27.3M1.45%+377,045+233.0%
22TLNTALEN ENERGY CORP$361.74-0.82%41.08%572.33%$26.0M1.39%+6,590+8.8%
23SMTCSEMTECH CORP$151.02-10.82%299.00%143.93%$25.6M1.36%176,328−34.7%
24CNRCORE NATURAL RESOURCES INC$93.44-5.53%39.96%382.84%$24.8M1.32%+106,794+82.0%
25MUSAMURPHY USA INC$546.511.25%29.28%280.06%$23.8M1.26%+48,107NEW
26BIIBBIOGEN INC$195.34-0.57%46.73%-40.21%$21.7M1.16%+33,491+39.4%
27KRUSKURA SUSHI USA INC$45.980.88%-42.15%-6.25%$21.0M1.12%+110,416+57.9%
28QLYSQUALYS INC$108.41-1.36%-22.53%8.21%$21.0M1.12%+187,173+361.0%
29JBLJABIL INC$353.24-5.51%100.26%502.89%$20.5M1.09%+6,532+9.2%
30CRCLCIRCLE INTERNET GROUP INC$80.28-11.33%-25.46%-56.26%$20.4M1.09%+213,796NEW
31DHTDHT HOLDINGS INC$16.49-0.99%$19.9M1.06%+1,091,788NEW
32NOKNOKIA CORP$14.38-13.48%$19.2M1.02%+1,317,848+122.5%
33ALNTALLIENT INC$86.331.73%$19.1M1.02%+21,565+7.1%
34PRIMPRIMORIS SVCS CORP$125.132.70%$18.7M0.99%+24,910+23.6%
35DAVEDAVE INC$264.392.38%$18.4M0.98%+61,441+139.6%
36KTOSKRATOS DEFENSE & SEC SOLUTIO$58.980.79%$18.3M0.97%34,195−11.6%
37MAMAMAMAS CREATIONS INC$15.260.73%$18.1M0.96%68,831−5.5%
38ADEAADEIA INC$28.98-10.44%$17.5M0.93%+473,253+184.7%
39UPWKUPWORK INC$8.911.77%$17.2M0.92%+850,916+118.2%
40PLSEPULSE BIOSCIENCES INC$25.580.99%$15.8M0.84%+339,873+86.4%
41PRCHPORCH GROUP INC$9.543.02%$15.4M0.82%+61,835+3.0%
42HAFNHAFNIA LTD$7.22-0.76%$14.8M0.79%+1,948,717NEW
43MECMAYVILLE ENGR CO INC$34.965.14%$14.7M0.78%+308,374+60.1%
44CADLCANDEL THERAPEUTICS INC$8.51-8.20%$14.2M0.75%+1,198,958+70.7%
45LASRNLIGHT INC$68.253.64%$12.9M0.68%364,857−61.8%
46GENIGENIUS SPORTS LIMITED$6.346.83%$12.4M0.66%147,101−5.0%
47ASAMER SPORTS INC$34.250.44%$11.8M0.63%+357,826NEW
48EBAYEBAY INC.$109.350.18%$11.5M0.61%+67,952+116.9%
49PKEPARK AEROSPACE CORP$32.21-0.91%$11.2M0.60%+165,620+67.6%
50ENVAENOVA INTL INC$169.190.22%$11.0M0.58%16,924−17.3%
51RELYREMITLY GLOBAL INC$18.940.90%$10.9M0.58%+70,147+11.2%
52EVLVEVOLV TECHNOLOGIES HLDNGS IN$5.86-0.93%$10.9M0.58%+1,795,688NEW
53WRBYWARBY PARKER INC$23.834.89%$10.5M0.56%731,467−59.4%
54BELFBBEL FUSE INC$278.856.20%$10.5M0.56%86,343−61.9%
55LPTHLIGHTPATH TECHNOLOGIES INC$15.242.07%$10.4M0.56%1,291,722−55.4%
56QTRXQUANTERIX CORP$3.18-3.48%$10.4M0.55%1,579,730−34.9%
57RRXREGAL REXNORD CORPORATION$204.40-4.42%$10.1M0.54%+30,877+133.7%
58AMSCAMERICAN SUPERCONDUCTOR CORP$43.623.01%$10.0M0.53%+295,636NEW
59TWLOTWILIO INC$225.99-4.50%$9.4M0.50%+74,769NEW
60FOURSHIFT4 PMTS INC$38.08-3.08%$9.4M0.50%253,779−54.2%
61HNSTHONEST CO INC$3.311.85%$9.0M0.48%1,758,372−36.6%
62FORRFORRESTER RESH INC$6.94-0.86%$8.7M0.46%+835,527+118.4%
63LPROOPEN LENDING CORP$2.120.24%$8.6M0.46%+2,166,258+45.7%
64MOG/AMOOG INC$8.6M0.46%+29,437NEW
65VECOVEECO INSTRS INC DEL$62.136.30%$8.6M0.46%+253,379NEW
66HQYHEALTHEQUITY INC$88.673.07%$8.5M0.45%+101,646NEW
67ELFE L F BEAUTY INC$52.014.92%$8.3M0.44%55,615−28.9%
68DGIIDIGI INTL INC$67.672.60%$8.2M0.44%67,294−28.3%
69GHMGRAHAM CORP$88.97-16.93%$8.2M0.43%+103,556NEW
70ZETAZETA GLOBAL HOLDINGS CORP$22.02-4.88%$7.7M0.41%832,526−63.1%
71ESIELEMENT SOLUTIONS INC$40.281.09%$7.6M0.40%+221,232NEW
72RPAYREPAY HLDGS CORP$3.470.00%$7.4M0.40%+65,897+2.4%
73ZGNERMENEGILDO ZEGNA N V$14.821.16%$7.4M0.39%+92+0.0%
74WLDNWILLDAN GROUP INC$99.362.22%$7.2M0.38%+36,351+63.1%
75ACLSAXCELIS TECHNOLOGIES INC$158.998.04%$7.2M0.38%+77,168NEW
76CIENCIENA CORP$488.21-8.85%$7.2M0.38%38,015−67.3%
77PACKRANPAK HOLDINGS CORP$6.932.06%$7.0M0.37%3,049−0.2%
78VNETVNET GROUP INC$8.84-8.96%$6.9M0.37%+18,690+2.3%
79ONONON HLDG AG$37.08-1.04%$6.9M0.37%+202,444NEW
80NXTNEXTPOWER INC$131.57-12.47%$6.8M0.36%23,042−28.9%
81FEIMFREQUENCY ELECTRS INC$69.902.31%$6.6M0.35%+37,065+32.8%
82WGSGENEDX HOLDINGS CORP$52.570.69%$6.6M0.35%+46,799+83.9%
83TTWOTAKE-TWO INTERACTIVE SOFTWAR$214.39-1.04%$6.4M0.34%5,468−14.5%
84PRCTPROCEPT BIOROBOTICS CORP$28.753.31%$6.3M0.34%3,402−1.3%
85NOGNORTHERN OIL & GAS INC$21.241.24%$6.0M0.32%+204,244NEW
86CDNACAREDX INC$22.330.36%$5.9M0.31%418,423−55.1%
87BLBLACKLINE INC$28.66-0.17%$5.9M0.31%+159,026NEW
88METAMETA PLATFORMS INC$593.00-5.51%$5.9M0.31%57−0.6%
89CELHCELSIUS HLDGS INC$28.131.37%$5.8M0.31%+164,597NEW
90DBRGDIGITALBRIDGE GROUP INC$15.66-0.06%$5.8M0.31%451,816−54.8%
91IESCIES HOLDINGS INC$712.50-1.14%$5.7M0.30%+77+0.7%
92TSEMTOWER SEMICONDUCTOR LTD$235.48-9.88%$5.6M0.30%116,482−78.4%
93AMBAAMBARELLA INC$68.257.45%$5.6M0.30%+54,507+100.5%
94CENXCENTURY ALUM CO$63.465.56%$5.6M0.30%+95,039NEW
95TALOTALOS ENERGY INC$14.44-5.62%$5.4M0.29%+225,449+189.3%
96TLXTELIX PHARMACEUTICAL LTD$9.330.29%$5.2M0.28%+541,267NEW
97MIAXMIAMI INTL HLDGS INC$39.21-1.01%$5.0M0.27%+128,819NEW
98AVAVAEROVIRONMENT INC$185.92-9.04%$4.9M0.26%49,078−64.6%
99VIAVVIAVI SOLUTIONS INC$47.56-10.62%$4.9M0.26%+145,844NEW
100XPEVXPENG INC$15.95-5.12%$4.7M0.25%+178,505+184.2%
101PSNLPERSONALIS INC$4.7M0.25%+357,516+94.3%
102MBLYMOBILEYE GLOBAL INC$4.7M0.25%+336,199+98.3%
103IIIVI3 VERTICALS INC$4.6M0.25%464,713−69.2%
104ONTOONTO INNOVATION INC$4.6M0.24%+22,263NEW
105PUMPPROPETRO HLDG CORP$4.5M0.24%+314,815NEW
106SEZLSEZZLE INC$4.4M0.24%97,827−58.3%
107NOVTNOVANTA INC$4.4M0.24%69,588−65.0%
108DOUGDOUGLAS ELLIMAN INC$4.4M0.23%+315,080+13.4%
109VICRVICOR CORP$4.3M0.23%22,051−45.3%
110LITELUMENTUM HLDGS INC$4.1M0.22%HELD
111BIOBIO RAD LABS INC$4.0M0.21%19,986−58.5%
112SANMSANMINA CORP$3.5M0.19%39,257−59.0%
113FPSFORGENT POWER SOLUTIONS INC$3.5M0.18%+117,933NEW
114DPRODRAGANFLY INC.$3.4M0.18%+682,730NEW
115GDOTGREEN DOT CORP$3.4M0.18%108,037−26.6%
116ACMRACM RESH INC$3.3M0.17%202,250−70.8%
117SPTSPROUT SOCIAL INC$3.2M0.17%+256,877+85.2%
118XZOEXZEO GROUP INC$3.1M0.16%195,129−48.2%
119OSKOSHKOSH CORP$2.7M0.14%7,755−29.9%
120AAOIAPPLIED OPTOELECTRONICS INC$2.5M0.13%198,625−86.9%
121AMPLAMPLITUDE INC$2.5M0.13%200,503−35.8%
122TPRTAPESTRY INC$2.4M0.13%8,830−34.1%
123GCTGIGACLOUD TECHNOLOGY INC$2.4M0.13%85,464−62.2%
124NTRANATERA INC$2.3M0.12%4,170−26.8%
125UCTTULTRA CLEAN HLDGS INC$2.1M0.11%+33,700NEW
126SDSANDRIDGE ENERGY INC$2.0M0.11%10,409−7.8%
127FLGTFULGENT GENETICS INC$1.7M0.09%62,948−37.1%
128KOSKOSMOS ENERGY LTD$1.7M0.09%+602,542NEW
129GOOGALPHABET INC$1.6M0.09%1,282−18.3%
130SEISOLARIS ENERGY INFRAS INC$1.6M0.08%+8,456+43.4%
131RDNTRADNET INC$1.3M0.07%93,778−79.8%
132PLPLANET LABS PBC$1.3M0.07%21,427−31.2%
133GHGUARDANT HEALTH INC$1.3M0.07%89,933−86.4%
134CWSTCASELLA WASTE SYS INC$1.2M0.06%125−0.8%
135DANDANA INC$1.2M0.06%218,186−86.4%
136TGENTECOGEN INC NEW$1.1M0.06%2,255−0.5%
137TMDXTRANSMEDICS GROUP INC$1.1M0.06%86,205−89.0%
138ECGEVERUS CONSTR GROUP$1.0M0.05%HELD
139LHXL3HARRIS TECHNOLOGIES INC$744K0.04%HELD
140GDSGDS HLDGS LTD$616K0.03%78−0.5%
141DOMODOMO INC$603K0.03%1,961,666−90.9%
142LINCLINCOLN EDL SVCS CORP$570K0.03%HELD
143ESTAESTABLISHMENT LABS HLDGS INC$544K0.03%85,075−89.9%
144AMPYAMPLIFY ENERGY CORP NEW$463K0.02%14,943−16.8%
145FSLRFIRST SOLAR INC78,761EXITED
146FAFFIRST AMERN FINL CORP320,670EXITED
147SPHRSPHERE ENTERTAINMENT CO175,646EXITED
148MRXMAREX GROUP PLC418,745EXITED
149TECHBIO-TECHNE CORP249,070EXITED
150FCXFREEPORT-MCMORAN INC288,124EXITED
151MGAMAGNA INTL INC255,481EXITED
152SNAPSNAP INC1,496,410EXITED
153TGLSTECNOGLASS INC238,852EXITED
154HZOMARINEMAX INC487,426EXITED
155ZGZILLOW GROUP INC150,068EXITED
156METCRAMACO RES INC561,718EXITED
157OPRAOPERA LTD631,177EXITED
158WATWATERS CORP22,379EXITED
159WIXWIX COM LTD80,298EXITED
160STCSTEWART INFORMATION SVCS COR117,708EXITED
161DKNGDRAFTKINGS INC NEW183,778EXITED
162NUSNU SKIN ENTERPRISES INC596,724EXITED
163SGSWEETGREEN INC848,085EXITED
164OWLTOWLET INC343,543EXITED
165BANDBANDWIDTH INC336,874EXITED
166OLPXOLAPLEX HLDGS INC3,082,600EXITED
167QGENQIAGEN NV90,182EXITED
168SMWBSIMILARWEB LTD492,861EXITED
169MRCYMERCURY SYS INC46,348EXITED
170OUSTOUSTER INC145,148EXITED
171QMCOQUANTUM CORP477,214EXITED
172MSFTMICROSOFT CORP5,972EXITED
173SMCISUPER MICRO COMPUTER INC96,544EXITED
174INDIINDIE SEMICONDUCTOR INC671,998EXITED
175AREALEXANDRIA REAL ESTATE EQ IN43,555EXITED
176GTESGATES INDL CORP PLC97,125EXITED
177ORCLORACLE CORP9,560EXITED
178SNSHARKNINJA INC15,907EXITED
179VRTVERTIV HOLDINGS CO9,039EXITED
180RDDTREDDIT INC3,558EXITED
181SHLSSHOALS TECHNOLOGIES GROUP IN72,781EXITED
182NWLNEWELL BRANDS INC126,100EXITED
183CMTGCLAROS MTG TR INC119,700EXITED
184WEAVWEAVE COMMUNICATIONS INC47,600EXITED
185HBIOUSDHARVARD BIOSCIENCE INC409,650EXITED

Source: SEC EDGAR · accession 0001104659-26-062488. 13F discloses long positions only — shorts, foreign equities, and options are excluded.