Stocks/Funds/CIK 937886

OBERWEIS ASSET MANAGEMENT INC/

long-term holder
Quarterly 13F filings · Latest period 2026-03-31 · CIK 937886
Assets
$3.39B
+68.8% YoY
Holdings
179
Lifetime alpha vs market
+1.58% annual
Average hold time
2.7 yr
median 2.0 yr

Quarterly history

Cum return +337% vs S&P +272% · α +65% lifetimeAUM $3.4B · peak $3.4BFlow $422M (+15%)2016-062017-122019-062020-122022-062023-122025-062026-03
AUM ($B)fundS&P 500(gap = α)/ Flow in/out

Behavior signals (lifetime)

Dip response
+5.79%
adds when stocks drop
when a holding falls −10%+
Middle response
+1.80%
steady accumulation
Rally response
+4.68%
adds into rallies
when a holding rises +10%+

Top positions · 30

Ticker$ value% portYoYHold time
AAOIApplied Optoelectronics,$199M5.9%+451.1%3.8 yr
LITELumentum Holdings Inc.$187M5.5%+1027.3%2.3 yr
CRDOCredo Technology Group H$96M2.8%+133.7%2.3 yr
DOCNDigitalOcean Holdings, I$80M2.3%+156.9%1.8 yr
SNSharkNinja, Inc.$64M1.9%+27.0%2.3 yr
NVMINova Ltd.$60M1.8%+135.6%2.8 yr
DANDana Incorporated$54M1.6%+157.7%2.5 yr
BTSGBrightSpring Health Serv$49M1.5%+135.5%1.0 yr
MTSIMACOM Technology Solutio$48M1.4%+121.2%4.5 yr
RMBSRambus Inc.$45M1.3%+66.1%1.5 yr
CLHClean Harbors, Inc.$41M1.2%+45.5%5.8 yr
SITMSiTime Corporation$41M1.2%+125.9%1.3 yr
UCTTUltra Clean Holdings, In$40M1.2%+190.4%8.0 yr
ECGEverus Construction Grou$39M1.1%+218.3%1.0 yr
FTDRFrontdoor, Inc.$38M1.1%+37.6%3.0 yr

Portfolio composition (YoY)

Industry mix
Semiconductors17.6%+8.2pp$597M
Communication Equipment9.7%+6.9pp$329M
Software - Application4.3%-5.6pp$145M
Biotechnology4.0%-2.6pp$137M
Software - Infrastructure3.9%-1.0pp$133M
Medical - Devices3.7%+2.6pp$124M
Industrial - Machinery3.3%-0.0pp$112M
Engineering & Construction3.3%+0.8pp$111M
Aerospace & Defense3.2%+1.0pp$107M
Medical - Healthcare Information Services2.9%-0.4pp$98M
Country
US91.7%+1.8pp
IL3.0%+0.4pp
CA1.0%+0.1pp
HK1.0%+0.4pp
Unknown0.8%-0.2pp
BM0.7%-0.6pp
GB0.6%+0.6pp
GG0.5%
Top 5: 18.5% · Top 10: 26.0% · Top 25: 41.8%

Winners

TickerPrev $PnLYoY %
AAOI$21M+0.10B451.1%
CRDO$51M+0.07B133.7%
DOCN$20M+0.03B156.9%
MTSI$23M+0.03B121.2%
NVMI$20M+0.03B135.6%

Losers

TickerPrev $PnLYoY %
LTH$24M-0.00B-10.8%
BROS$14M-0.00B-17.9%

Top buys this quarter · 15

CRDO Credo Technology Group Holding+$96M
DAN Dana Incorporated+$27M
AAOI Applied Optoelectronics, Inc.+$26M
DRS Leonardo DRS, Inc.new+$20M
INDV Indivior Pharmaceuticals Incnew+$20M
CHYM Chime Financial, Inc. Class A new+$19M
HNGE Hinge Health, Inc.new+$18M
NVST Envista Holdings Corpnew+$17M
SHAK Shake Shack Inc.new+$17M
ARQT Arcutis Biotherapeutics, Inc.+$13M

Top sells this quarter · 15

CARG CarGurus, Inc.exit$18M
AMBA Ambarella, Inc.$17M
SXT Sensient Technologies Corporatexit$16M
FRSH Freshworks Inc.$16M
ACIW ACI Worldwide, Inc.exit$14M
LITE Lumentum Holdings Inc.$104M
ACMR ACM Research, Inc.$9M
TPB Turning Point Brands, Inc.exit$9M
CVLT Commvault Systems, Inc.exit$9M
GDOT Green Dot Corporationexit$9M

Quarterly history (TTM returns)

PeriodAUM# PosReturn (1yr)SPY (1yr)Alpha (1yr)Flow
2026-03-31$3.39B179+45.65%+17.59%+28.06%+0.42B
2025-12-31$2.73B178+21.09%+17.72%+3.37%+0.03B
2025-09-30$2.61B182+17.56%+17.52%+0.04%+0.04B
2025-06-30$2.30B184+17.85%+14.94%+2.91%-0.03B
2025-03-31$2.01B191+7.05%+8.30%-1.25%+0.10B
2024-12-31$2.12B195+26.38%+24.89%+1.49%+0.16B
2024-09-30$1.95B205+36.41%+36.04%+0.38%+0.12B
2024-06-30$1.63B195+15.61%+24.49%-8.88%+0.17B
2024-03-31$1.38B194+17.93%+29.62%-11.69%+0.24B
2023-12-31$1.07B190+29.63%+26.18%+3.45%+0.05B
2023-09-30$941M191+31.64%+21.57%+10.07%+0.16B
2023-06-30$823M182+33.36%+19.42%+13.93%+0.13B
2023-03-31$645M169-2.82%-7.82%+5.00%+0.09B
2022-12-31$470M163-20.69%-18.17%-2.52%+0.00B
2022-09-30$427M168-19.97%-15.51%-4.46%+0.05B
2022-06-30$395M159-16.39%-10.62%-5.77%+0.00B