undamentalytics Newsletter
Sign in

Asset manager

Oberweis Asset Management Inc/

13F for the quarter to June 30, 2026, filed August 14, 2026 · SEC CIK 937886

Reported value
$4.8bn
95% in companies we cover
Positions we cover
164
Largest CRDO 5.7%
Copy, a year
+14.3%
S&P 500 +14.1%
Copy Sharpe ratio
0.57
S&P 500 0.78

How copying its 13F would have done

$10.0k$20.0k$40.0k 2013201520172019202120232025 $58.2k$57.0k
CopyS&P 500 $10,000 copying Oberweis Asset Management Inc/'s filed holdings in companies we cover from August 16, 2013, buying on the first trading day after each 13F was filed and holding until the next, against the S&P 500 (total return). Marked weekly, log scale. Before costs and taxes; misses trading within each quarter and anything 13F does not show (shorts, cash, bonds, non-US holdings).

Biggest drop −42.4% (S&P 500 −31.8%); beta 1.28; alpha −1.3% a year (t = −0.31); last 12 months +17.6% against +12.1%.

Reported value by quarter

Oberweis Asset Management Inc/: 13F reported value Total value of all positions in each quarter's 13F, as filed (values before 2023 were filed in thousands of dollars and are converted).
$0 $200B $400B $600B Reported value, 2013-06-30: $352.7M Reported value, 2013-09-30: $352.1M Reported value, 2013-12-31: $412.9M Reported value, 2014-03-31: $476.2M Reported value, 2014-06-30: $405.6M Reported value, 2014-09-30: $365.1M Reported value, 2014-12-31: $334.9M Reported value, 2015-03-31: $356M Reported value, 2015-06-30: $378M Reported value, 2015-09-30: $343.2M Reported value, 2015-12-31: $356.5M Reported value, 2016-03-31: $346.2M Reported value, 2016-06-30: $336.5M Reported value, 2016-09-30: $347.4M Reported value, 2016-12-31: $334.7M Reported value, 2017-03-31: $339.3M Reported value, 2017-06-30: $364.4M Reported value, 2017-09-30: $359.3M Reported value, 2017-12-31: $427.5M Reported value, 2018-03-31: $381M Reported value, 2018-06-30: $397.9M Reported value, 2018-09-30: $516M Reported value, 2018-12-31: $447.1M Reported value, 2019-03-31: $498M Reported value, 2019-06-30: $550.4M Reported value, 2019-09-30: $442.5M Reported value, 2019-12-31: $300.2M Reported value, 2020-03-31: $181.2M Reported value, 2020-06-30: $254.7M Reported value, 2020-09-30: $297M Reported value, 2020-12-31: $379.8M Reported value, 2021-03-31: $488.9M Reported value, 2021-06-30: $456.5M Reported value, 2021-09-30: $482.9M Reported value, 2021-12-31: $548.1M Reported value, 2022-03-31: $499.2M Reported value, 2022-06-30: $395.1M Reported value, 2022-09-30: $427.3M Reported value, 2022-12-31: $470.4B Reported value, 2023-03-31: $644.5M Reported value, 2023-06-30: $822.8M Reported value, 2023-09-30: $941.5M Reported value, 2023-12-31: $1.1B Reported value, 2024-03-31: $1.4B Reported value, 2024-06-30: $1.6B Reported value, 2024-09-30: $2B Reported value, 2024-12-31: $2.1B Reported value, 2025-03-31: $2B Reported value, 2025-06-30: $2.3B Reported value, 2025-09-30: $2.6B Reported value, 2025-12-31: $2.7B Reported value, 2026-03-31: $3.4B Reported value, 2026-06-30: $4.8B 2013-06-30 2016-03-31 2018-12-31 2021-09-30 2026-06-30 $4.8B
View chart data
Period Reported value
2013-06-30 $352.7M
2013-09-30 $352.1M
2013-12-31 $412.9M
2014-03-31 $476.2M
2014-06-30 $405.6M
2014-09-30 $365.1M
2014-12-31 $334.9M
2015-03-31 $356M
2015-06-30 $378M
2015-09-30 $343.2M
2015-12-31 $356.5M
2016-03-31 $346.2M
2016-06-30 $336.5M
2016-09-30 $347.4M
2016-12-31 $334.7M
2017-03-31 $339.3M
2017-06-30 $364.4M
2017-09-30 $359.3M
2017-12-31 $427.5M
2018-03-31 $381M
2018-06-30 $397.9M
2018-09-30 $516M
2018-12-31 $447.1M
2019-03-31 $498M
2019-06-30 $550.4M
2019-09-30 $442.5M
2019-12-31 $300.2M
2020-03-31 $181.2M
2020-06-30 $254.7M
2020-09-30 $297M
2020-12-31 $379.8M
2021-03-31 $488.9M
2021-06-30 $456.5M
2021-09-30 $482.9M
2021-12-31 $548.1M
2022-03-31 $499.2M
2022-06-30 $395.1M
2022-09-30 $427.3M
2022-12-31 $470.4B
2023-03-31 $644.5M
2023-06-30 $822.8M
2023-09-30 $941.5M
2023-12-31 $1.1B
2024-03-31 $1.4B
2024-06-30 $1.6B
2024-09-30 $2B
2024-12-31 $2.1B
2025-03-31 $2B
2025-06-30 $2.3B
2025-09-30 $2.6B
2025-12-31 $2.7B
2026-03-31 $3.4B
2026-06-30 $4.8B

Holdings and moves

CompanyShare of portfolioValueSharesChange in shares
CRDOCredo Technology Group Holding Ltd5.70%$275.6m1.01M−0.8% Reduced
AAOIApplied Optoelectronics, Inc.5.48%$265.4m1.79M−23.8% Reduced
DOCNDigitalocean Holdings, Inc.3.02%$146.0m930.0K+0.3%
SIMOSilicon Motion Technology Corp2.18%$105.4m316.4K+12.0% Added
UCTTUltra Clean Holdings, Inc.1.91%$92.3m647.3K+1.1% Added
SNSharkninja, Inc.1.87%$90.4m593.5K−1.1% Reduced
BTSGBrightspring Health Services, Inc.1.71%$82.7m1.19M+2.3% Added
HNGEHinge Health, Inc.1.47%$71.0m855.5K+83.7% Added
RMBSRambus Inc1.45%$70.0m527.0K+0.1%
MTSIMacom Technology Solutions Holdings, Inc.1.41%$68.2m179.4K−16.9% Reduced
LITELumentum1.28%$61.9m72.2K−72.9% Reduced
LSCCLattice Semiconductor Corp1.24%$59.9m391.8K+4.6% Added
NVMINova LTD.1.22%$59.0m108.7K−21.2% Reduced
CRSCarpenter Technology Corp1.19%$57.5m93.3K−1.2% Reduced
FTDRFrontdoor, Inc.1.15%$55.8m719.1K+0.2%
ECGEverus Construction Group, Inc.1.13%$54.5m328.2K+0.5% Added
VCYTVeracyte, Inc.1.06%$51.5m877.7K+4.5% Added
POWLPowell Industries Inc1.06%$51.4m179.5K+425.6% Added
LTHLife Time Group Holdings, Inc.1.00%$48.6m1.19M+2.5% Added
RSIRush Street Interactive, Inc.1.00%$48.4m1.63M+13.5% Added
MRCYMercury Systems Inc0.99%$48.0m392.7K+0.4%
BROSDutch Bros Inc.0.97%$47.1m656.1K+9.6% Added
CLHClean Harbors Inc0.95%$45.9m153.5K+6.3% Added
SEISolaris Energy Infrastructure, Inc.0.94%$45.4m564.6K+6.1% Added
DIODDiodes Inc0.94%$45.3m413.8K+84.5% Added
BLBDBlue Bird Corp0.86%$41.8m529.8K+36.1% Added
CAMTCamtek LTD0.85%$41.3m253.4K+13.7% Added
LIVNLivanova PLC0.85%$41.1m500.1K+55.4% Added
AMSCAmerican Superconductor Corp0.85%$41.0m987.5K+16.2% Added
MXLMaxlinear, Inc0.84%$40.9m319.5KNew
GMEDGlobus Medical Inc0.84%$40.5m512.1K+30.6% Added
NOVTNovanta Inc0.82%$39.6m244.3KNew
SKYWSkywest Inc0.79%$38.1m383.8K−2.2% Reduced
VIAVViavi Solutions Inc.0.78%$37.9m793.6K+33.8% Added
LFUSLittelfuse Inc0.75%$36.3m79.8K+11.1% Added
ARQTArcutis Biotherapeutics, Inc.0.74%$36.0m1.37M+0.5% Added
FCFSFirstcash Holdings, Inc.0.74%$35.9m166.1K+0.3%
BLLNBilliontoone, Inc.0.74%$35.9m299.0KNew
DANDana Inc0.74%$35.9m1.32M−18.2% Reduced
ESIElement Solutions Inc0.73%$35.3m740.1KNew
AIRAAR Corp0.73%$35.2m246.3K+0.5%
RELYRemitly Global, Inc.0.73%$35.2m1.57M+8.0% Added
ICUIICU Medical Inc0.72%$34.8m237.1K+16.4% Added
FSSFederal Signal Corp0.71%$34.6m269.1K+0.5% Added
OUSTOuster, Inc.0.70%$34.1m545.8KNew
LEVILevi Strauss & Co0.70%$33.7m1.36M+16.3% Added
MMSIMerit Medical Systems Inc0.68%$32.8m473.4K+11.6% Added
AIZAssurant0.68%$32.8m122.1K+19.4% Added
WAYWaystar Holding Corp.0.67%$32.6m1.59M+36.1% Added
LQDALiquidia Corp0.67%$32.4m406.4K+9.2% Added
EHCEncompass Health Corp0.66%$32.0m316.9K+9.5% Added
INDVIndivior Pharmaceuticals, Inc.0.66%$32.0m779.2K+19.2% Added
CGNXCognex Corp0.64%$31.0m427.8KNew
GVAGranite Construction Inc0.63%$30.5m193.1KNew
PDFSPDF Solutions Inc0.62%$30.2m426.4KNew
NVSTEnvista Holdings Corp0.61%$29.5m1.12M+68.4% Added
DAVEDave Inc.0.61%$29.4m78.9K+18.3% Added
AMBAAmbarella Inc0.61%$29.4m342.3K+15.9% Added
LASRNlight, Inc.0.59%$28.8m413.3K+13.9% Added
MYRGMYR Group Inc.0.56%$27.1m54.2KNew
ADPTAdaptive Biotechnologies Corp0.56%$27.0m1.26M+56.0% Added
DRSLeonardo DRS, Inc.0.55%$26.8m628.5K+39.8% Added
TPCTutor Perini Corp0.55%$26.8m323.2K−17.9% Reduced
KGSKodiak Gas Services, Inc.0.55%$26.7m355.9KNew
KNSAKiniksa Pharmaceuticals International, plc0.55%$26.4m413.0K+29.6% Added
CHYMChime Financial, Inc.0.54%$26.0m1.27M+22.5% Added
ALHCAlignment Healthcare, Inc.0.54%$25.9m1.09M+12.7% Added
HALOHalozyme Therapeutics, Inc.0.52%$25.1m321.0K+46.0% Added
IRTCIrhythm Holdings, Inc.0.50%$24.0m202.0K+29.5% Added
ABCBAmeris Bancorp0.49%$23.9m264.6K+0.4%
ZWSZurn Elkay Water Solutions Corp0.49%$23.7m468.5K+33.0% Added
OSISOSI Systems Inc0.48%$23.4m107.1K+0.5% Added
OMDAOmada Health, Inc.0.48%$23.0m1.05MNew
URBNUrban Outfitters Inc0.46%$22.4m316.2K+0.4%
ANIPANI Pharmaceuticals Inc0.45%$22.0m265.3K+19.8% Added
EZPWEzcorp Inc0.45%$21.8m631.8K−1.2% Reduced
CNRCore Natural Resources, Inc.0.45%$21.7m271.2K+0.5% Added
DCODucommun Inc0.44%$21.1m113.8K+13.9% Added
SKWDSkyward Specialty Insurance Group, Inc.0.43%$21.0m359.1K+9.8% Added
WLDNWilldan Group, Inc.0.43%$20.8m262.7KNew
ATENA10 Networks, Inc.0.43%$20.6m552.0K+9.5% Added
HQYHealthequity, Inc.0.43%$20.6m228.3K+37.0% Added
SGHCSuper Group (sghc) Ltd0.43%$20.6m1.52M+0.4%
SPXCSPX Technologies, Inc.0.42%$20.5m83.8K+0.4%
FORMFormfactor Inc0.42%$20.4m127.3KNew
WTSWatts Water Technologies Inc0.41%$19.9m50.8KNew
OPLNOpenlane, Inc.0.41%$19.8m480.6KNew
QTWOQ2 Holdings, Inc.0.41%$19.7m410.4K+4.0% Added
BOXBOX Inc0.41%$19.7m743.0K−3.7% Reduced
VSECVSE Corp0.41%$19.7m86.1K+153.2% Added
BHEBenchmark Electronics Inc0.40%$19.6m198.3K−1.8% Reduced
NYTNEW York Times Co0.40%$19.4m277.1K+30.9% Added
AEISAdvanced Energy Industries Inc0.38%$18.4m49.4K+0.5%
ETONEton Pharmaceuticals, Inc.0.38%$18.2m501.6K+14.2% Added
AXGNAxogen, Inc.0.37%$17.9m388.2K+13.4% Added
FNFabrinet0.35%$17.1m30.4K+0.4%
AGXArgan Inc0.35%$16.9m21.1K−36.6% Reduced
VISNVistance Networks, Inc.0.34%$16.6m1.30M+18.9% Added
TRSTrimas Corp0.34%$16.3m362.0KNew
ZETAZeta Global Holdings Corp.0.33%$16.1m819.8K−5.9% Reduced
SBCFSeacoast Banking Corp Of Florida0.33%$15.9m477.9K+26.1% Added
TILEInterface Inc0.33%$15.9m443.2K−0.2%
MDPediatrix Medical Group, Inc.0.33%$15.8m623.1K−11.1% Reduced
PUMPPropetro Holding Corp.0.33%$15.7m1.10M+13.6% Added
FSLYFastly, Inc.0.32%$15.6m852.3K−20.4% Reduced
MTDRMatador Resources Co0.32%$15.6m314.2K+0.5%
OSWOnespaworld Holdings Ltd0.32%$15.6m553.0K+13.9% Added
LMATLemaitre Vascular Inc0.31%$15.2m158.5K+6.7% Added
CALXCalix, Inc0.31%$15.0m402.2K+20.1% Added
ARLOArlo Technologies, Inc.0.30%$14.7m1.09M+11.3% Added
INODInnodata Inc0.29%$14.3m189.2KNew
MGNIMagnite, Inc.0.29%$14.0m735.0K+13.5% Added
NICNicolet Bankshares Inc0.28%$13.8m83.2K+11.2% Added
LOPEGrand Canyon Education, Inc.0.27%$13.2m92.5K−20.8% Reduced
IMAXImax Corp0.27%$13.0m326.5K−43.4% Reduced
PLUSEplus Inc0.26%$12.6m151.0K+9.8% Added
KNKnowles Corp0.25%$12.2m293.1K+25.2% Added
IDCCInterdigital, Inc.0.25%$12.2m42.9K+0.7% Added
BOOTBoot Barn Holdings, Inc.0.25%$12.0m73.2K+7.3% Added
LINDLindblad Expeditions Holdings, Inc.0.25%$11.9m420.7K+11.1% Added
MGYMagnolia Oil & Gas Corp0.24%$11.7m456.5K+0.4%
VVXV2x, Inc.0.23%$11.0m147.4KNew
EVLVEvolv Technologies Holdings, Inc.0.22%$10.6m1.82M+9.1% Added
CRMDCormedix Inc.0.21%$10.4m1.32M+9.3% Added
GRCGorman Rupp Co0.21%$10.0m108.6K+14.3% Added
FBKFB Financial Corp0.20%$9.8m177.1K+9.3% Added
PAHCPhibro Animal Health Corp0.20%$9.8m311.1K+12.3% Added
NPKINPK International Inc.0.19%$9.3m587.5K+13.4% Added
APEIAmerican Public Education Inc0.19%$9.3m172.4K+32.2% Added
ADUSAddus Homecare Corp0.19%$9.0m89.9K+0.6% Added
BWBabcock & Wilcox Enterprises, Inc.0.18%$8.9m627.9K+25.5% Added
RDWRRadware LTD0.18%$8.8m286.2K−0.2%
AMPXAmprius Technologies, Inc.0.18%$8.8m636.2K+8.8% Added
PDSPrecision Drilling Corp0.18%$8.5m110.8K−1.6% Reduced
KFRCKforce Inc0.17%$8.3m176.2KNew
SRCE1st Source Corp0.16%$7.7m93.8K+8.8% Added
CNXNPC Connection Inc0.16%$7.6m104.3K+8.4% Added
BVSBioventus Inc.0.14%$6.7m709.7K+13.0% Added
XPROExpro Ltd0.14%$6.7m452.0KNew
CHEFChefs' Warehouse, Inc.0.11%$5.5m57.5KNew
COCOVita Coco Company, Inc.0.11%$5.5m83.6K−46.4% Reduced
RCKYRocky Brands, Inc.0.10%$4.9m117.7K−0.3%
ACMRACM Research, Inc.0.03%$1.6m13.0K0.0%
JPMJPMorgan Chase0.02%$1.0m3.2K+0.7% Added
AAPLApple Inc.0.02%$1.0m3.5K0.0%
MSFTMicrosoft Corporation0.02%$994,0982.7K0.0%
MUMicron Technology0.02%$808,0037000.0%
FRSHFreshworks Inc.0.01%$584,43057.8K0.0%
JNJJohnson & Johnson0.01%$583,5222.3K+0.2%
TRVThe Travelers Companies0.01%$522,5681.6K+0.1%
CompanyBought (value)Shares
POWLPowell Industries Inc$41.6m145.4K
MXLMaxlinear, Inc$40.9m319.5K
NOVTNovanta Inc$39.6m244.3K
BLLNBilliontoone, Inc.$35.9m299.0K
ESIElement Solutions Inc$35.3m740.1K
OUSTOuster, Inc.$34.1m545.8K
HNGEHinge Health, Inc.$32.3m389.7K
CGNXCognex Corp$31.0m427.8K
GVAGranite Construction Inc$30.5m193.1K
PDFSPDF Solutions Inc$30.2m426.4K
MYRGMYR Group Inc.$27.1m54.2K
KGSKodiak Gas Services, Inc.$26.7m355.9K
OMDAOmada Health, Inc.$23.0m1.05M
WLDNWilldan Group, Inc.$20.8m262.7K
DIODDiodes Inc$20.7m189.4K

Change in shares on the previous quarter's 13F, valued at this quarter's reported price.

CompanySold (value)Shares
LITELumentum−$166.5m−194.0K
AAOIApplied Optoelectronics, Inc.−$82.8m−558.8K
FLSFlowserve Corp−$32.0m−434.7K
PRIMPrimoris Services Corp−$23.8m−166.1K
GGenpact LTD−$22.6m−606.8K
ATECAlphatec Holdings, Inc.−$20.8m−1.91M
EYENational Vision Holdings, Inc.−$20.7m−797.8K
PEGAPegasystems Inc−$19.4m−455.3K
AEOAmerican Eagle Outfitters Inc−$17.4m−1.04M
WGSGenedx Holdings Corp.−$16.8m−261.4K
SHAKShake Shack Inc.−$16.6m−187.6K
NVMINova LTD.−$15.9m−29.3K
MTSIMacom Technology Solutions Holdings, Inc.−$13.9m−36.5K
MIRMirion Technologies, Inc.−$13.8m−744.3K
PIImpinj Inc−$12.1m−118.1K

Change in shares on the previous quarter's 13F, valued at this quarter's reported price.

CompanyValue last quarterShares
FLSFlowserve Corp$32.0m434.7K
PRIMPrimoris Services Corp$23.8m166.1K
GGenpact LTD$22.6m606.8K
ATECAlphatec Holdings, Inc.$20.8m1.91M
EYENational Vision Holdings, Inc.$20.7m797.8K
PEGAPegasystems Inc$19.4m455.3K
AEOAmerican Eagle Outfitters Inc$17.4m1.04M
WGSGenedx Holdings Corp.$16.8m261.4K
SHAKShake Shack Inc.$16.6m187.6K
MIRMirion Technologies, Inc.$13.8m744.3K
PIImpinj Inc$12.1m118.1K
QLYSQualys, Inc.$10.4m118.9K
AORTArtivion, Inc.$8.1m221.1K
LINCLincoln Educational Services Corp$7.7m188.4K
CRAICRA International, Inc.$5.9m36.5K
HURNHuron Consulting Group Inc.$5.4m42.3K
TCMDTactile Systems Technology Inc$5.3m202.8K
COURCoursera, Inc.$4.8m821.8K
BRCBBlack Rock Coffee Bar, Inc.$4.7m365.6K
CLMBClimb Global Solutions, Inc.$4.2m211.8K
FUTUFutu Holdings Ltd$615,4204.5K
WEAVWeave Communications, Inc.$336,47572.8K
  • Technology42.7%
  • Health Care19.2%
  • Industrials15.3%
  • Consumer Discretionary10.2%
  • Financials6.0%
  • Energy3.3%
  • Materials2.0%
  • Communication Services1.0%
  • Consumer Staples0.2%

Share of the value held in companies we cover, by sector.

PeriodCopy, a yearS&P 500SharpeS&P 500Biggest dropBeta
Whole backtestAugust 16, 2013 to November 2, 2026+14.3%+14.1%0.570.78−42.4%1.28
2018 onwardsJanuary 5, 2018 to November 2, 2026+10.0%+13.9%0.380.66−42.4%1.27
Last three yearsNovember 3, 2023 to November 2, 2026+19.5%+21.8%0.711.16−25.3%1.28
Last yearNovember 7, 2025 to November 2, 2026+20.5%+14.2%0.780.84−17.1%1.24

From SEC Form 13F data sets. A 13F lists long positions in US-listed shares at the quarter's end, filed up to 45 days later; it does not show shorts, cash, bonds, non-US holdings or trades within the quarter. Positions in companies outside our coverage are not listed here. Research, not investment advice.