HolderBook

OBERWEIS ASSET MANAGEMENT INC/

Reported holdings as of Q2 2026, from 31 quarterly filings.

CIK
937886
Reported value
$4.8B
Positions
176
Top 10 weight
26.6%
Filed
2026-08-14
Days after quarter end
45

Holdings

SecurityTickerValue SharesWeightWeight change Held Change
CREDO TECHNOLOGY GROUP HOLDICRDO$275.6M1,013,4285.69%+2.86pp10q-0.8%-$2.3M
APPLIED OPTOELECTRONICS INCAAOI$265.4M1,791,1275.48%-0.39pp12q-23.8%-$82.8M
DIGITALOCEAN HLDGS INCDOCN$146.0M930,0053.02%+0.67pp8qHELD
SILICON MOTION TECHNOLOGY COSIMO$105.4M316,3502.18%+1.24pp11q+12.0%+$11.3M
ULTRA CLEAN HLDGS INCUCTT$92.3M647,2761.91%+0.73pp27q+1.1%+$969.6K
SHARKNINJA INCSN$90.4M593,5001.87%-0.01pp10q-1.1%-$985.2K
SITIME CORPSITM$89.1M119,5011.84%+0.62pp5qHELD
BRIGHTSPRING HEALTH SVCS INCBTSG$82.7M1,185,2801.71%+0.25pp5q+2.3%+$1.8M
HINGE HEALTH INCHNGE$71.0M855,4761.47%+0.94pp2q+83.7%+$32.3M
RAMBUS INC DELRMBS$70.0M527,0161.45%+0.11pp7qHELD
MACOM TECH SOLUTIONS HLDGS IMTSI$68.2M179,3561.41%-0.01pp8q-16.9%-$13.9M
LUMENTUM HLDGS INCLITE$61.9M72,1851.28%-4.25pp5q-72.9%-$166.5M
LATTICE SEMICONDUCTOR CORPLSCC$59.9M391,8161.24%+0.21pp4q+4.6%+$2.7M
NOVA LTDNVMI$59.0M108,6751.22%-0.55pp8q-21.2%-$15.9M
CARPENTER TECHNOLOGY CORPCRS$57.5M93,2731.19%+0.09pp11q-1.2%-$715.5K
FRONTDOOR INCFTDR$55.8M719,0601.15%+0.03pp13qHELD
EVERUS CONSTR GROUPECG$54.5M328,1831.13%-0.01pp5q+0.5%+$273.8K
VERACYTE INCVCYT$51.5M877,7341.07%+0.27pp15q+4.5%+$2.2M
POWELL INDS INCPOWL$51.4M179,5211.06%+0.52pp12q+425.6%+$41.6M
LIFE TIME GROUP HOLDINGS INCLTH$48.6M1,189,6201.00%+0.08pp6q+2.5%+$1.2M
RUSH STREET INTERACTIVE INCRSI$48.4M1,627,9301.00%+0.08pp10q+13.5%+$5.8M
MERCURY SYS INCMRCY$48.0M392,7230.99%+0.15pp6qHELD
DUTCH BROS INCBROS$47.1M656,0930.97%+0.08pp9q+9.6%+$4.1M
CLEAN HARBORS INCCLH$45.9M153,4750.95%-0.28pp23q+6.3%+$2.7M
SOLARIS ENERGY INFRAS INCSEI$45.4M564,5810.94%+0.05pp6q+6.1%+$2.6M
DIODES INCDIOD$45.3M413,7500.94%+0.48pp5q+84.5%+$20.7M
ARCOSA INCACA$42.9M295,4500.89%+0.05pp7q+10.4%+$4.0M
BLUE BIRD CORPBLBD$41.8M529,8380.86%+0.21pp14q+36.1%+$11.1M
CAMTEK LTDCAMT$41.3M253,3800.85%-0.14pp31q+13.7%+$5.0M
LIVANOVA PLCLIVN$41.1M500,1500.85%+0.25pp4q+55.4%+$14.7M
AMERICAN SUPERCONDUCTOR CORPAMSC$41.0M987,5000.85%flat11q+16.2%+$5.7M
MAXLINEAR INCMXL$40.9M319,5000.85%-newNEW
GLOBUS MED INCGMED$40.5M512,1000.84%-0.16pp3q+30.6%+$9.5M
NOVANTA INCNOVT$39.6M244,2600.82%-newNEW
SKYWEST INCSKYW$38.1M383,7990.79%-0.28pp11q-2.2%-$864.2K
VIAVI SOLUTIONS INCVIAV$37.9M793,6000.78%+0.20pp3q+33.8%+$9.6M
MOOG INCMOGA$36.8M86,7350.76%+0.37pp2q+93.1%+$17.7M
LITTELFUSE INCLFUS$36.3M79,8000.75%+0.03pp4q+11.1%+$3.6M
ARCUTIS BIOTHERAPEUTICS INCARQT$36.0M1,372,9410.74%-0.21pp3q+0.5%+$183.5K
FIRSTCASH HOLDINGS INCFCFS$35.9M166,1050.74%-0.18pp17qHELD
BILLIONTOONE INCBLLN$35.9M299,0300.74%-newNEW
DANA INCDAN$35.9M1,318,3000.74%-0.86pp3q-18.2%-$8.0M
ELEMENT SOLUTIONS INCESI$35.3M740,1000.73%-newNEW
AAR CORPAIR$35.2M246,3250.73%-0.07pp6qHELD
REMITLY GLOBAL INCRELY$35.2M1,570,4000.73%+0.05pp5q+8.0%+$2.6M
ICU MED INCICUI$34.8M237,0500.72%-0.06pp8q+16.4%+$4.9M
FEDERAL SIGNAL CORPFSS$34.6M269,0840.71%-0.14pp16q+0.5%+$186.3K
OUSTER INCOUST$34.1M545,8100.71%-newNEW
LEVI STRAUSS & CO NEWLEVI$33.7M1,358,1000.70%+0.06pp4q+16.3%+$4.7M
MERIT MED SYS INCMMSI$32.8M473,4090.68%-0.19pp19q+11.6%+$3.4M
ASSURANT INCAIZ$32.8M122,1000.68%+0.02pp11q+19.4%+$5.3M
WAYSTAR HLDG CORPWAY$32.6M1,589,3640.67%-0.16pp7q+36.1%+$8.7M
CECO ENVIRONMENTAL CORPCECO$32.5M358,0720.67%+0.43pp4q+165.2%+$20.2M
LIQUIDIA CORPORATIONLQDA$32.4M406,4000.67%+0.25pp10q+9.2%+$2.7M
ENCOMPASS HEALTH CORPEHC$32.0M316,8860.66%-0.17pp13q+9.5%+$2.8M
INDIVIOR PHARMACEUTICALS INCINDV$32.0M779,1880.66%+0.07pp2q+19.2%+$5.2M
COGNEX CORPCGNX$31.0M427,8200.64%-newNEW
GRANITE CONSTR INCGVA$30.5M193,0900.63%-newNEW
PDF SOLUTIONS INCPDFS$30.2M426,4000.62%-newNEW
ENVISTA HOLDINGS CORPORATIONNVST$29.5M1,120,7820.61%+0.11pp2q+68.4%+$12.0M
DAVE INCDAVE$29.4M78,9020.61%+0.26pp5q+18.3%+$4.5M
AMBARELLA INCAMBA$29.4M342,2540.61%+0.16pp8q+15.9%+$4.0M
NLIGHT INCLASR$28.8M413,3100.59%-0.02pp4q+13.9%+$3.5M
MYR GROUP INCMYRG$27.1M54,1900.56%-newNEW
ADAPTIVE BIOTECHNOLOGIES CORADPT$27.0M1,258,7510.56%+0.23pp5q+56.0%+$9.7M
LEONARDO DRS INCDRS$26.8M628,4860.55%-0.04pp2q+39.8%+$7.6M
TUTOR PERINI CORPTPC$26.8M323,2000.55%-0.34pp6q-17.9%-$5.9M
KODIAK GAS SVCS INCKGS$26.7M355,8700.55%-newNEW
KINIKSA PHARMACEUTICALS INTLKNSA$26.4M413,0340.55%+0.09pp8q+29.6%+$6.0M
CHIME FINL INCCHYM$26.0M1,268,3300.54%-0.04pp2q+22.5%+$4.8M
ALIGNMENT HEALTHCARE INCALHC$25.9M1,089,6000.54%+0.03pp3q+12.7%+$2.9M
HALOZYME THERAPEUTICS INCHALO$25.1M321,0300.52%+0.10pp5q+46.0%+$7.9M
IRHYTHM HOLDINGS INCIRTC$24.0M202,0040.50%-0.05pp5q+29.5%+$5.5M
AMERIS BANCORPABCB$23.9M264,6000.49%-0.11pp8qHELD
ZURN ELKAY WATER SOLNS CORPZWS$23.7M468,4530.49%+0.02pp4q+33.0%+$5.9M
OSI SYSTEMS INCOSIS$23.4M107,1430.48%-0.35pp12q+0.5%+$120.3K
OMADA HEALTH INCOMDA$23.0M1,048,8000.48%-newNEW
URBAN OUTFITTERS INCURBN$22.4M316,1920.46%-0.13pp5qHELD
ANI PHARMACEUTICALS INCANIP$22.0M265,3060.45%-0.05pp12q+19.8%+$3.6M
EZCORP INCEZPW$21.8M631,8000.45%-0.03pp17q-1.2%-$262.7K
CORE NATURAL RESOURCES INCCNR$21.7M271,1700.45%-0.39pp3q+0.5%+$109.6K
DUCOMMUN INC DELDCO$21.1M113,8000.44%+0.08pp7q+13.9%+$2.6M
SKYWARD SPECIALTY INS GROUPSKWD$21.0M359,1000.43%+0.01pp11q+9.8%+$1.9M
WILLDAN GROUP INCWLDN$20.8M262,7000.43%-newNEW
A10 NETWORKS INCATEN$20.6M552,0000.43%+0.08pp2q+9.5%+$1.8M
HEALTHEQUITY INCHQY$20.6M228,2910.43%+0.01pp11q+37.0%+$5.6M
SUPER GROUP SGHC LIMITEDSGHC$20.6M1,521,0000.43%-0.06pp3qHELD
SPX TECHNOLOGIES INCSPXC$20.5M83,8110.42%-0.07pp13qHELD
FORMFACTOR INCFORM$20.4M127,3300.42%-newNEW
WATTS WATER TECHNOLOGIES INCWTS$19.9M50,8400.41%-newNEW
OPENLANE INCOPLN$19.8M480,5800.41%-newNEW
Q2 HLDGS INCQTWO$19.7M410,4090.41%-0.14pp9q+4.0%+$759.0K
BOX INCBOX$19.7M743,0000.41%-0.13pp8q-3.7%-$756.9K
VSE CORPVSEC$19.7M86,0980.41%+0.22pp17q+153.2%+$11.9M
BENCHMARK ELECTRS INCBHE$19.6M198,3000.40%+0.07pp3q-1.8%-$355.2K
NEW YORK TIMES CO MTN BENYT$19.4M277,0500.40%-0.12pp4q+30.9%+$4.6M
ADVANCED ENERGY INDSAEIS$18.4M49,4230.38%-0.09pp5qHELD
ETON PHARMACEUTICALS INCETON$18.2M501,6000.38%+0.05pp4q+14.2%+$2.3M
AXOGEN INCAXGN$17.9M388,1940.37%+0.04pp8q+13.4%+$2.1M
FABRINETFN$17.1M30,3730.35%-0.11pp12qHELD
ARGAN INCAGX$16.9M21,1200.35%-0.19pp8q-36.6%-$9.7M
VISTANCE NETWORKS INCVISN$16.6M1,298,6120.34%-0.24pp4q+18.9%+$2.6M
TRIMAS CORPTRS$16.3M362,0000.34%-newNEW
ZETA GLOBAL HOLDINGS CORPZETA$16.1M819,7700.33%-0.08pp14q-5.9%-$1.0M
SEACOAST BKG CORP FLASBCF$15.9M477,8660.33%-0.01pp2q+26.1%+$3.3M
INTERFACE INCTILE$15.9M443,2000.33%flat8qHELD
PEDIATRIX MEDICAL GROUP INCMD$15.8M623,0870.33%-0.12pp7q-11.1%-$2.0M
PROPETRO HLDG CORPPUMP$15.7M1,097,1000.33%-0.09pp3q+13.6%+$1.9M
FASTLY INCFSLY$15.6M852,3220.32%-0.60pp3q-20.4%-$4.0M
MATADOR RES COMTDR$15.6M314,2000.32%-0.26pp16qHELD
ONESPAWORLD HOLDINGS LIMITEDOSW$15.6M552,9900.32%-0.01pp11q+13.9%+$1.9M
LEMAITRE VASCULAR INCLMAT$15.2M158,5020.31%-0.16pp16q+6.7%+$950.1K
CALIX INCCALX$15.0M402,2300.31%-0.17pp3q+20.1%+$2.5M
ARLO TECHNOLOGIES INCARLO$14.7M1,093,3000.30%-0.11pp2q+11.3%+$1.5M
INNODATA INCINOD$14.3M189,2000.30%-newNEW
MAGNITE INCMGNI$14.0M735,0000.29%+0.06pp9q+13.5%+$1.7M
NICOLET BANKSHARES INCNIC$13.8M83,2000.28%-0.04pp8q+11.2%+$1.4M
M/I HOMES INCMHO$13.4M83,4000.28%flat27q+9.2%+$1.1M
GRAND CANYON ED INCLOPE$13.2M92,5300.27%-0.31pp11q-20.8%-$3.5M
IMAX CORPIMAX$13.0M326,5390.27%-0.38pp10q-43.4%-$10.0M
EPLUS INCPLUS$12.6M150,9980.26%-0.05pp3q+9.8%+$1.1M
KNOWLES CORPKN$12.2M293,1100.25%+0.07pp2q+25.2%+$2.4M
INTERDIGITAL INCIDCC$12.2M42,9350.25%-0.13pp6q+0.7%+$82.1K
BOOT BARN HLDGS INCBOOT$12.0M73,2000.25%-0.05pp30q+7.3%+$821.4K
LINDBLAD EXPEDITIONS HLDGS ILIND$11.9M420,7210.25%+0.05pp7q+11.1%+$1.2M
MAGNOLIA OIL & GAS CORPMGY$11.7M456,4660.24%-0.18pp21qHELD
V2X INCVVX$11.0M147,3700.23%-newNEW
EVOLV TECHNOLOGIES HLDNGS INEVLV$10.6M1,823,9490.22%-0.08pp5q+9.1%+$881.6K
CORMEDIX INCCRMD$10.4M1,323,9150.21%-0.03pp6q+9.3%+$885.5K
GORMAN RUPP COGRC$10.0M108,6000.21%+0.03pp12q+14.3%+$1.2M
FB FINL CORPFBK$9.8M177,1000.20%-0.05pp8q+9.3%+$830.2K
PHIBRO ANIMAL HEALTH CORPPAHC$9.8M311,1000.20%-0.25pp3q+12.3%+$1.1M
NPK INTERNATIONAL INCNPKI$9.3M587,5500.19%-0.03pp5q+13.4%+$1.1M
AMERICAN PUB ED INCAPEI$9.3M172,4000.19%-0.03pp2q+32.2%+$2.3M
CATALYST PHARMACEUTICALS INCCPRX$9.2M293,6700.19%-0.38pp15q-62.4%-$15.3M
ADDUS HOMECARE CORPADUS$9.0M89,9160.19%-0.06pp9q+0.6%+$52.2K
BABCOCK & WILCOX ENTERPRISESBW$8.9M627,9000.18%-0.03pp2q+25.5%+$1.8M
RADWARE LTDRDWR$8.8M286,2000.18%-0.04pp8qHELD
AMPRIUS TECHNOLOGIES INCAMPX$8.8M636,2000.18%-0.11pp2q+8.8%+$709.6K
PRECISION DRILLING CORPPDS$8.5M110,8000.18%-0.15pp11q-1.6%-$138.0K
KFORCE INCKFRC$8.3M176,2000.17%-newNEW
1ST SOURCE CORPSRCE$7.7M93,8000.16%-0.02pp12q+8.8%+$620.0K
PC CONNECTION INCCNXN$7.6M104,3000.16%-0.01pp2q+8.4%+$591.2K
RED VIOLET INCRDVT$7.6M119,0000.16%+0.05pp6q+13.7%+$911.2K
BIOVENTUS INCBVS$6.7M709,7140.14%-0.03pp9q+13.0%+$770.3K
EXPRO LTD ORD SHS$6.7M452,0000.14%-newNEW
CHEFS WHSE INCCHEF$5.5M57,5440.11%-newNEW
VITA COCO CO INCCOCO$5.5M83,6080.11%-0.11pp11q-46.4%-$4.8M
ROCKY BRANDS INCRCKY$4.9M117,7000.10%-0.03pp2qHELD
STATE STR SPDR S&P 500 ETF TSPY$1.8M2,3780.04%-0.01pp31qHELD
ACM RESH INCACMR$1.6M13,0000.03%+0.02pp2qHELD
JPMORGAN CHASE & COJPM$1.0M3,2060.02%-0.01pp31q+0.7%+$7.2K
APPLE INCAAPL$1.0M3,5320.02%-0.01pp31qHELD
MICROSOFT CORPMSFT$994.1K2,6650.02%-0.01pp31qHELD
MICRON TECHNOLOGY INCMU$808.0K7000.02%+0.01pp3qHELD
ALPHABET INCGOOGL$679.1K1,9000.01%flat6qHELD
FRESHWORKS INCFRSH$584.4K57,7500.01%flat7qHELD
JOHNSON & JOHNSONJNJ$583.5K2,2980.01%flat31qHELD
ALPHABET INCGOOG$572.4K1,6200.01%flat6qHELD
TRAVELERS COMPANIES INCTRV$522.6K1,5830.01%flat31qHELD
AMGEN INCAMGN$375.3K1,0360.01%flat31qHELD
BANK OF NY MELLON CORPBNY$363.1K2,5110.01%flat8qHELD
CATERPILLAR INCCAT$349.6K3280.01%flat4q-19.6%-$85.3K
MASTERCARD INCORPORATEDMA$340.0K6620.01%flat31qHELD
H WORLD GROUP LTDHTHT$333.8K8,0000.01%-0.03pp3q-66.7%-$667.5K
INTEL CORPINTC$323.1K2,3140.01%-newNEW
RESMED INCRMD$282.6K1,4500.01%flat29qHELD
NEWMONT CORPNEM$268.6K2,8760.01%flat5qHELD
WELLS FARGO & COWFCPRL$260.3K2250.01%flat3qHELD
WALMART INCWMT$242.2K2,1390.01%flat9qHELD
AFLAC INCAFL$234.5K2,0000.00%flat8qHELD
MCDONALDS CORPMCD$231.4K8560.00%flat15qHELD
FREEPORT-MCMORAN INCFCX$225.9K3,5930.00%flat2qHELD
MERCK & CO INCMRK$222.3K1,7300.00%flat2qHELD
ELI LILLY & COLLY$219.5K1830.00%-newNEW
98401A106$0140,0000.00%-newNEW

By sector

Industry comes from the SIC code on each company's own SEC filings, which is self-reported and sometimes out of date. Derivative exposure is counted with the shares. Securities the SEC assigns no industry - funds, trusts, foreign issues - are shown as not classified rather than dropped.

Semiconductors & Electronics 35.4%Software & IT Services 8.1%Industrials 6.1%Healthcare Services 5.2%Medical Devices 5.0%Biotech & Pharma 5.0%Business Services 4.7%Retail & Consumer 4.4%Autos & Aerospace 4.0%Construction & Building 3.5%Telecom & Media 3.5%Instruments & Controls 3.0%Other sectors 11.9%Not classified 0.3%
 
SectorValueShare
Semiconductors & Electronics$1.7B35.4%
Software & IT Services$389.8M8.1%
Industrials$293.0M6.1%
Healthcare Services$250.0M5.2%
Medical Devices$242.8M5.0%
Biotech & Pharma$240.6M5.0%
Business Services$227.4M4.7%
Retail & Consumer$214.1M4.4%
Autos & Aerospace$195.4M4.0%
Construction & Building$169.2M3.5%
Telecom & Media$167.6M3.5%
Instruments & Controls$144.3M3.0%
Other sectors$574.8M11.9%
Not classified$16.2M0.3%

Quarter by quarter

QuarterValuePositions NewAddedTrimmed ExitedTop 10 Days to file
Q2 2026$4.8B1762489242726.6%45
Q1 2026$3.4B17922125192126.0%45
Q4 2025$2.7B1782197192520.8%48
Q3 2025$2.6B1822336302519.7%48
Q2 2025$2.3B1842082302719.7%45
Q1 2025$2.0B1912456152818.4%45
Q4 2024$2.1B19530112244017.9%45
Q3 2024$2.0B2053574312517.8%45
Q2 2024$1.6B1952891282717.3%45
Q1 2024$1.4B19433110342915.8%45
Q4 2023$1.1B19043105334421.7%45
Q3 2023$941.5M19144115183524.1%45
Q2 2023$822.8M18232104241927.4%45
Q1 2023$644.5M16924118131834.6%45
Q4 2022$470.4M16326106123134.5%45
Q3 2022$427.3M1683477412545.5%45
Q2 2022$395.1M1592173512252.5%46
Q1 2022$499.2M1602877182356.7%46
Q4 2021$548.1M1552365352557.2%45
Q3 2021$482.9M1572751442860.0%46
Q2 2021$456.5M1583144363858.0%47
Q1 2021$488.9M1655538382361.0%47
Q4 2020$379.8M1333729332565.8%47
Q3 2020$297.0M1212928332665.4%47
Q2 2020$254.7M1183323518258.1%45
Q1 2020$181.2M1672449765346.1%45
Q4 2019$300.2M1964441784042.6%45
Q3 2019$442.5M1923755683744.5%45
Q2 2019$550.4M1923175573652.4%45
Q1 2019$498.0M1974956624845.2%45
Q4 2018$447.1M196000042.7%45

Rows marked UNVERIFIED ID, PLACEHOLDER ID, TICKER AS ID or NON-CUSIP ID carry an identifier that is not a valid CUSIP. They are shown because the filer reported that money, but treat the security named with caution - hover the chip for what is wrong with it, and see the methodology.

Held counts consecutive filings in which this manager reported the position, and can reach further back than the quarters listed above: the tabs begin at Q4 2018 because earlier coverage is too sparse to describe a market, but tenure is counted over every filing we hold, some reaching to 2007. A position sold and later rebought starts again from one.

Weight change is the shift in this position's share of the whole book, in percentage points. It is the more useful column: when money flows into or out of a broad fund, almost every holding is bought or sold at once, so added and trimmed largely track flows. A weight that rose while the book shrank is a decision. Both compare with the previous quarter this filer reported, not the previous calendar quarter.