Oberweis Asset Management Inc/
Net buyer this quarter
$4.84B
175
+$290M
26.6%
Holdings
| Company | Value | % of portfolio | % of company | POSITION CHANGE qoq % | First reported |
|---|---|---|---|---|---|
| Q2 2026 | |||||
 CRDO | $276M | 5.69% | 0.54% | -0.8% | Q1 2024 |
 AAOI | $265M | 5.48% | 2.12% | -23.8% | Q3 2016 |
 DOCN | $146M | 3.02% | 0.89% | +0.3% | Q3 2024 |
 SIMO | $105M | 2.18% | 0.24% | +12.0% | Q4 2023 |
 UCTT | $92.3M | 1.91% | 1.43% | +1.1% | Q3 2015 |
 SN | $90.4M | 1.87% | 0.42% | -1.1% | Q1 2024 |
 SITM | $89.1M | 1.84% | 0.45% | +0.2% | Q1 2023 |
 BTSG | $82.7M | 1.71% | 0.60% | +2.3% | Q2 2025 |
 HNGE | $71M | 1.47% | 5.22% | +83.7% | Q1 2026 |
 RMBS | $70M | 1.45% | 0.49% | +0.1% | Q4 2024 |
 MTSI | $68.2M | 1.41% | 0.24% | -16.9% | Q3 2020 |
 LITE | $61.9M | 1.28% | 0.08% | -72.9% | Q1 2017 |
 LSCC | $59.9M | 1.24% | 0.29% | +4.6% | Q2 2014 |
 NVMI | $59M | 1.22% | 0.34% | -21.2% | Q4 2021 |
 CRS | $57.5M | 1.19% | 0.19% | -1.2% | Q4 2017 |
 FTDR | $55.8M | 1.15% | 1.04% | +0.2% | Q2 2023 |
 ECG | $54.5M | 1.13% | 0.64% | +0.5% | Q2 2025 |
 VCYT | $51.5M | 1.07% | 1.09% | +4.5% | Q3 2018 |
 POWL | $51.4M | 1.06% | 0.49% | +75.2% | Q3 2018 |
 LTH | $48.6M | 1.00% | 0.53% | +2.5% | Q1 2025 |
 RSI | $48.4M | 1.00% | 0.79% | +13.5% | Q1 2024 |
 MRCY | $48M | 0.99% | 0.65% | +0.4% | Q1 2015 |
 BROS | $47.1M | 0.97% | 0.43% | +9.6% | Q2 2024 |
 CLH | $45.9M | 0.95% | 0.29% | +6.3% | Q1 2019 |
 SEI | $45.4M | 0.94% | Not reported | +6.2% | Q3 2018 |
 DIOD | $45.3M | 0.94% | 0.90% | +84.5% | Q3 2013 |
 ACA | $42.9M | 0.89% | 0.60% | +10.4% | Q4 2019 |
 BLBD | $41.8M | 0.86% | 1.67% | +36.1% | Q1 2023 |
 CAMT | $41.3M | 0.85% | 0.55% | +13.7% | Q1 2018 |
 LIVN | $41.1M | 0.85% | 0.91% | +55.4% | Q4 2023 |
 AMSC | $41M | 0.85% | 2.04% | +16.2% | Q4 2023 |
 MXL | $40.9M | 0.85% | 0.35% | Not reported | Q2 2013 |
 GMED | $40.5M | 0.84% | 0.38% | +30.6% | Q4 2015 |
 NOVT | $39.6M | 0.82% | 0.69% | Not reported | Q3 2022 |
 SKYW | $38.1M | 0.79% | 0.97% | -2.2% | Q2 2015 |
 VIAV | $37.9M | 0.78% | 0.32% | +33.8% | Q3 2019 |
 MOG.A | $36.8M | 0.76% | Not reported | +93.1% | Q1 2026 |
 LFUS | $36.3M | 0.75% | 0.32% | +11.1% | Q2 2023 |
 ARQT | $36M | 0.74% | 1.09% | +0.5% | Q4 2025 |
 FCFS | $35.9M | 0.74% | 0.38% | +0.3% | Q2 2022 |
 BLLN | $35.9M | 0.74% | 2.68% | New | Q2 2026 |
 DAN | $35.9M | 0.74% | 1.23% | -18.2% | Q2 2018 |
 ESI | $35.3M | 0.73% | 0.30% | New | Q2 2026 |
 AIR | $35.2M | 0.73% | 0.62% | +0.5% | Q1 2025 |
 RELY | $35.2M | 0.73% | 0.74% | +8.0% | Q2 2025 |
 ICUI | $34.8M | 0.72% | 0.95% | +16.4% | Q3 2024 |
 FSS | $34.6M | 0.71% | 0.44% | +0.5% | Q4 2017 |
 OUST | $34.1M | 0.71% | 0.80% | New | Q2 2026 |
 LEVI | $33.7M | 0.70% | 0.36% | +16.4% | Q3 2025 |
 MMSI | $32.8M | 0.68% | 0.79% | +11.6% | Q1 2014 |
| Q1 2026 | |||||
| AAOI | $199M | 5.87% | 2.98% | +15.2% | Q3 2016 |
| LITE | $187M | 5.53% | 0.37% | -5.2% | Q1 2017 |
| CRDO | $95.9M | 2.83% | 0.55% | +51.3% | Q1 2024 |
| DOCN | $79.6M | 2.35% | 0.89% | +19.1% | Q3 2024 |
| SN | $63.5M | 1.88% | 0.42% | +14.0% | Q1 2024 |
| NVMI | $59.9M | 1.77% | 0.43% | +21.8% | Q4 2021 |
| DAN | $54.2M | 1.60% | 1.48% | +102.3% | Q2 2018 |
| BTSG | $49.4M | 1.46% | 0.60% | +27.6% | Q2 2025 |
| MTSI | $47.9M | 1.42% | 0.29% | +20.6% | Q3 2020 |
| RMBS | $45.3M | 1.34% | 0.49% | +13.9% | Q4 2024 |
| CLH | $41.4M | 1.22% | 0.27% | +23.5% | Q1 2019 |
| SITM | $41.2M | 1.22% | 0.45% | +12.1% | Q1 2023 |
| UCTT | $39.8M | 1.18% | 1.43% | +1.9% | Q3 2015 |
| ECG | $38.6M | 1.14% | 0.64% | +25.7% | Q2 2025 |
| FTDR | $38M | 1.12% | 1.02% | +17.5% | Q2 2023 |
| CRS | $37.2M | 1.10% | 0.19% | +14.3% | Q4 2017 |
| SKYW | $36M | 1.06% | 0.97% | +2.7% | Q2 2015 |
| LSCC | $34.7M | 1.03% | 0.27% | +19.0% | Q2 2014 |
| GMED | $33.8M | 1.00% | 0.29% | +45.3% | Q4 2015 |
| CAMT | $33.8M | 1.00% | 0.49% | +1.8% | Q1 2018 |
| ARQT | $32.2M | 0.95% | 1.09% | +69.0% | Q4 2025 |
 FLS | $32M | 0.94% | 0.34% | +6.0% | Q2 2023 |
| SIMO | $31.7M | 0.94% | 0.21% | +19.6% | Q4 2023 |
| LTH | $31.3M | 0.92% | 0.52% | +9.6% | Q1 2025 |
| RSI | $31.2M | 0.92% | 0.70% | +1.6% | Q1 2024 |
| FCFS | $31.1M | 0.92% | 0.38% | +26.2% | Q2 2022 |
 FSLY | $31.1M | 0.92% | 0.68% | +55.3% | Q3 2023 |
 TPC | $30.4M | 0.90% | 0.75% | +1.7% | Q1 2025 |
| BROS | $30.3M | 0.90% | 0.39% | +48.0% | Q2 2024 |
| SEI | $30.1M | 0.89% | Not reported | +45.0% | Q3 2018 |
| MMSI | $29.2M | 0.86% | 0.71% | +57.8% | Q1 2014 |
| FSS | $28.9M | 0.85% | 0.44% | +60.7% | Q4 2017 |
| AMSC | $28.8M | 0.85% | 1.78% | +1.7% | Q4 2023 |
| MRCY | $28.5M | 0.84% | 0.66% | -5.6% | Q1 2015 |
| ACA | $28.4M | 0.84% | 0.55% | +20.8% | Q4 2019 |
 OSIS | $28.3M | 0.84% | 0.65% | +5.1% | Q1 2017 |
 CNR | $28.3M | 0.83% | 0.53% | +51.2% | Q4 2025 |
 WAY | $28.1M | 0.83% | 0.61% | +38.9% | Q4 2024 |
 EHC | $28M | 0.83% | 0.29% | -19.4% | Q2 2023 |
| VCYT | $27.1M | 0.80% | 1.05% | +15.6% | Q3 2018 |
| AIR | $26.8M | 0.79% | 0.62% | -10.1% | Q1 2025 |
| ICUI | $26.3M | 0.78% | 0.82% | +21.2% | Q3 2024 |
| LFUS | $24.4M | 0.72% | 0.29% | +15.3% | Q2 2023 |
 PRIM | $23.8M | 0.70% | 0.31% | +1.7% | Q3 2023 |
| RELY | $22.8M | 0.67% | 0.69% | +45.0% | Q2 2025 |
 G | $22.6M | 0.67% | 0.36% | +16.3% | Q3 2024 |
 AIZ | $22.3M | 0.66% | 0.21% | +23.3% | Q4 2023 |
| BLBD | $22.1M | 0.65% | 1.23% | +1.7% | Q1 2023 |
 IMAX | $21.9M | 0.65% | 1.05% | -11.5% | Q2 2013 |
| LEVI | $21.6M | 0.64% | 0.31% | +17.5% | Q3 2025 |
| Q4 2025 | |||||
| LITE | $104M | 3.79% | 0.39% | -14.5% | Q1 2017 |
| CRDO | $97.2M | 3.55% | 0.37% | +4.9% | Q1 2024 |
| AAOI | $71.1M | 2.60% | 2.72% | +8.0% | Q3 2016 |
| SN | $58.9M | 2.15% | 0.37% | +9.0% | Q1 2024 |
 AMBA | $43.8M | 1.60% | 1.44% | +1.1% | Q2 2013 |
| RMBS | $42.5M | 1.55% | 0.43% | -9.0% | Q4 2024 |
| SKYW | $38.4M | 1.40% | 0.95% | +15.6% | Q2 2015 |
| EHC | $38.1M | 1.39% | 0.36% | +0.1% | Q2 2023 |
| SITM | $37.6M | 1.37% | 0.40% | Not reported | Q1 2023 |
| DOCN | $37.5M | 1.37% | 0.85% | +0.9% | Q3 2024 |
| NVMI | $37.2M | 1.36% | 0.36% | Not reported | Q4 2021 |
| FTDR | $35.2M | 1.29% | 0.86% | Not reported | Q2 2023 |
| BTSG | $34M | 1.24% | 0.47% | Not reported | Q2 2025 |
| MTSI | $30.7M | 1.12% | 0.24% | +0.7% | Q3 2020 |
| VCYT | $30.6M | 1.12% | 0.92% | +0.7% | Q3 2018 |
| MRCY | $30.2M | 1.11% | 0.70% | +3.9% | Q1 2015 |
| FLS | $28.4M | 1.04% | 0.32% | +0.2% | Q2 2023 |
| LTH | $28.2M | 1.03% | 0.48% | +22.3% | Q1 2025 |
| WAY | $27.5M | 1.01% | 0.44% | +0.5% | Q4 2024 |
| RSI | $27.4M | 1.00% | 0.69% | +18.5% | Q1 2024 |
| CLH | $27.4M | 1.00% | 0.22% | +0.1% | Q1 2019 |
| CRS | $26M | 0.95% | 0.17% | Not reported | Q4 2017 |
| TPC | $26M | 0.95% | 0.73% | +2.5% | Q1 2025 |
| OSIS | $25.9M | 0.95% | 0.62% | Not reported | Q1 2017 |
 WGS | $25.9M | 0.95% | 0.68% | +2.5% | Q2 2024 |
 PEGA | $25.4M | 0.93% | 0.25% | +9.1% | Q4 2015 |
 FRSH | $25.2M | 0.92% | 1.33% | -0.2% | Q4 2024 |
| BROS | $24.8M | 0.91% | 0.26% | Not reported | Q2 2024 |
| G | $24.4M | 0.89% | 0.31% | +0.9% | Q3 2024 |
 QTWO | $24.3M | 0.89% | 0.54% | +15.3% | Q2 2024 |
| IMAX | $24.1M | 0.88% | 1.21% | +12.5% | Q2 2013 |
| AMSC | $24.1M | 0.88% | 1.76% | +25.6% | Q4 2023 |
| ICUI | $24M | 0.88% | 0.68% | +12.7% | Q3 2024 |
| MMSI | $23.7M | 0.87% | 0.45% | +15.8% | Q1 2014 |
| GMED | $23.6M | 0.86% | 0.20% | Not reported | Q4 2015 |
| ACA | $23.6M | 0.86% | 0.45% | Not reported | Q4 2019 |
| ARQT | $23.5M | 0.86% | 0.66% | New | Q4 2025 |
| CAMT | $23.3M | 0.85% | 0.48% | +2.5% | Q1 2018 |
| LSCC | $23.2M | 0.85% | 0.23% | +14.2% | Q2 2014 |
| AIR | $22.6M | 0.83% | 0.69% | +15.3% | Q1 2025 |
| ECG | $22.2M | 0.81% | 0.51% | Not reported | Q2 2025 |
| SIMO | $21.9M | 0.80% | 0.18% | +2.5% | Q4 2023 |
 URBN | $21.6M | 0.79% | 0.32% | +22.2% | Q2 2019 |
 AEO | $21.5M | 0.79% | 0.48% | +68.3% | Q3 2019 |
 IRTC | $21.2M | 0.78% | 0.37% | +47.4% | Q1 2019 |
 ATEC | $21M | 0.77% | 0.67% | +117.0% | Q3 2020 |
 NYT | $21M | 0.77% | Not reported | +20.1% | Q3 2025 |
| FCFS | $20.9M | 0.77% | 0.30% | +34.3% | Q2 2022 |
| LEVI | $20.6M | 0.75% | 0.26% | +10.0% | Q3 2025 |
| PRIM | $20.3M | 0.74% | 0.30% | -15.1% | Q3 2023 |
| Q3 2025 | |||||
| CRDO | $93.8M | 3.59% | 0.37% | -15.1% | Q1 2024 |
| LITE | $53.5M | 2.05% | 0.46% | +22.1% | Q1 2017 |
| RMBS | $52.9M | 2.03% | 0.47% | +0.4% | Q4 2024 |
| AMBA | $50.4M | 1.93% | 1.43% | +6.6% | Q2 2013 |
| SN | $49.8M | 1.91% | 0.34% | -0.4% | Q1 2024 |
| AAOI | $49M | 1.87% | 2.77% | Not reported | Q3 2016 |
| EHC | $45.6M | 1.75% | 0.36% | -0.1% | Q2 2023 |
| FTDR | $41.1M | 1.57% | 0.84% | Not reported | Q2 2023 |
 ADMA | $39.8M | 1.52% | 1.14% | -13.5% | Q4 2022 |
| AMSC | $39.5M | 1.51% | 1.47% | -0.4% | Q4 2023 |
 SRAD | $37.1M | 1.42% | Not reported | +0.1% | Q4 2024 |
| NVMI | $36.2M | 1.39% | 0.38% | +0.2% | Q4 2021 |
 ITRI | $35.4M | 1.36% | 0.62% | -0.1% | Q1 2016 |
| SKYW | $33.3M | 1.27% | 0.82% | -0.1% | Q2 2015 |
| SITM | $32.1M | 1.23% | 0.41% | +44.8% | Q1 2023 |
| WAY | $31.7M | 1.21% | 0.48% | +12.3% | Q4 2024 |
| MRCY | $30.8M | 1.18% | 0.67% | Not reported | Q1 2015 |
| CLH | $27.1M | 1.04% | 0.22% | -0.5% | Q1 2019 |
 LRN | $27.1M | 1.04% | 0.41% | Not reported | Q2 2021 |
| BTSG | $26.8M | 1.03% | 0.50% | +17.0% | Q2 2025 |
| PRIM | $26.4M | 1.01% | 0.36% | Not reported | Q3 2023 |
| DOCN | $26.4M | 1.01% | 0.84% | +22.2% | Q3 2024 |
| OSIS | $25.3M | 0.97% | 0.60% | -7.0% | Q1 2017 |
| TPC | $24.8M | 0.95% | 0.72% | Not reported | Q1 2025 |
| VCYT | $24.8M | 0.95% | 0.91% | -0.7% | Q3 2018 |
| RSI | $24.4M | 0.93% | 0.58% | +11.4% | Q1 2024 |
 CVLT | $24.3M | 0.93% | 0.29% | +2.1% | Q1 2021 |
| FRSH | $24.2M | 0.93% | 1.34% | +0.4% | Q4 2024 |
| LTH | $23.9M | 0.92% | 0.39% | +6.7% | Q1 2025 |
 QRVO | $23.8M | 0.91% | 0.28% | +30.3% | Q2 2025 |
 PSN | $22.6M | 0.87% | 0.49% | -4.0% | Q2 2023 |
| CAMT | $22.4M | 0.86% | 0.47% | Not reported | Q1 2018 |
| PEGA | $22.4M | 0.86% | 0.23% | -0.1% | Q4 2015 |
| ECG | $22.3M | 0.85% | 0.51% | +12.9% | Q2 2025 |
| MTSI | $22.1M | 0.85% | 0.24% | -1.0% | Q3 2020 |
 LOPE | $21.9M | 0.84% | 0.36% | +10.4% | Q2 2013 |
| SIMO | $21.9M | 0.84% | 0.17% | Not reported | Q4 2023 |
| FLS | $21.7M | 0.83% | 0.31% | -21.6% | Q2 2023 |
| G | $21.6M | 0.83% | 0.30% | +68.8% | Q3 2024 |
| BLBD | $21.5M | 0.82% | 1.17% | Not reported | Q1 2023 |
| AIR | $21.2M | 0.81% | 0.65% | Not reported | Q1 2025 |
| BROS | $21.2M | 0.81% | 0.26% | +70.0% | Q2 2024 |
| QTWO | $21.2M | 0.81% | 0.47% | +0.1% | Q2 2024 |
| LEVI | $21.1M | 0.81% | 0.24% | New | Q3 2025 |
 BOX | $21.1M | 0.81% | 0.45% | -0.2% | Q3 2024 |
| WGS | $20.9M | 0.80% | 0.67% | +19.0% | Q2 2024 |
| ACA | $20.8M | 0.80% | 0.45% | Not reported | Q4 2019 |
| CRS | $20.3M | 0.78% | 0.17% | -0.4% | Q4 2017 |
| LSCC | $20.2M | 0.77% | 0.20% | Not reported | Q2 2014 |
| FSS | $19.8M | 0.76% | 0.27% | Not reported | Q4 2017 |