OBERWEIS ASSET MANAGEMENT INC/
13F filer · CIK 937886 · Lisle, IL
Summary
OBERWEIS ASSET MANAGEMENT INC/ reported $4.84B across 176 positions in its 13F for 2026 Q2, filed Aug 14, 2026. The largest holdings are CRDO (5.7%), AAOI (5.5%), DOCN (3.0%). Versus 2026 Q1, leaving options aside, it opened 23 new positions, added to 113, trimmed 27 and sold out of 27.
Reported value$4.84B
Positions176
Report period2026 Q2
FiledAug 14, 2026
New positions23
Added113
Trimmed27
Sold out27
Top 25 holdings
By reported value, options listed separately · change vs 2026 Q1
Weight 5.7%Value $275.60MPrice $192.67Shares 1.01M -0.84%Since Jun 30 -29.15%
Weight 5.5%Value $265.37MPrice $100.67Shares 1.79M -23.78%Since Jun 30 -32.05%
Weight 3.0%Value $146.04MPrice $136.29Shares 930K +0.27%Since Jun 30 -13.21%
Weight 2.2%Value $105.45MPrice $278.07Shares 316K +11.96%Since Jun 30 -16.58%
Weight 1.9%Value $92.30MPrice $78.07Shares 647K +1.06%Since Jun 30 -45.25%
Weight 1.9%Value $90.37MPrice $181.99Shares 594K -1.08%Since Jun 30 +19.52%
Weight 1.8%Value $89.10MPrice $656.65Shares 120K +0.18%Since Jun 30 -11.93%
Weight 1.7%Value $82.66MPrice $55.69Shares 1.19M +2.27%Since Jun 30 -20.15%
Weight 1.5%Value $71.00MPrice $92.45Shares 855K +83.67%Since Jun 30 +11.39%
Weight 1.4%Value $69.96MPrice $102.12Shares 527K +0.13%Since Jun 30 -23.07%
Weight 1.4%Value $68.22MPrice $278.56Shares 179K -16.92%Since Jun 30 -26.77%
Weight 1.3%Value $61.94MPrice $921.32Shares 72K -72.89%Since Jun 30 +7.37%
Weight 1.2%Value $59.93MPrice $124.03Shares 392K +4.64%Since Jun 30 -18.91%
Weight 1.2%Value $59.00MPrice $370.42Shares 109K -21.22%Since Jun 30 -31.78%
Weight 1.2%Value $57.53MPrice $385.30Shares 93K -1.23%Since Jun 30 -37.54%
Weight 1.2%Value $55.79MPrice $72.92Shares 719K +0.15%Since Jun 30 -6.02%
Weight 1.1%Value $54.46MPrice $116.66Shares 328K +0.51%Since Jun 30 -29.70%
Weight 1.1%Value $51.55MPrice $45.23Shares 878K +4.51%Since Jun 30 -22.99%
Weight 1.1%Value $51.41MPrice $187.23Shares 180K +425.58%Since Jun 30 -34.62%
Weight 1.0%Value $48.58MPrice $39.59Shares 1.19M +2.51%Since Jun 30 -3.06%
Weight 1.0%Value $48.41MPrice $19.55Shares 1.63M +13.48%Since Jun 30 -34.26%
Weight 1.0%Value $48.04MPrice $80.12Shares 393K +0.43%Since Jun 30 -34.51%
Weight 1.0%Value $47.11MPrice $38.10Shares 656K +9.62%Since Jun 30 -46.94%
Weight 0.9%Value $45.85MPrice $313.26Shares 153K +6.32%Since Jun 30 +4.86%
Weight 0.9%Value $45.43MPrice $69.15Shares 565K +6.15%Since Jun 30 -14.06%
| Stock | Weight | Value | Since Jun 30 | Shares change | Action |
|---|---|---|---|---|---|
| 5.7% | $275.60M | -29.15% | -0.84% | Trim | |
| 5.5% | $265.37M | -32.05% | -23.78% | Trim | |
| 3.0% | $146.04M | -13.21% | +0.27% | Add | |
| 2.2% | $105.45M | -16.58% | +11.96% | Add | |
| 1.9% | $92.30M | -45.25% | +1.06% | Add | |
| 1.9% | $90.37M | +19.52% | -1.08% | Trim | |
| 1.8% | $89.10M | -11.93% | +0.18% | Add | |
| 1.7% | $82.66M | -20.15% | +2.27% | Add | |
| 1.5% | $71.00M | +11.39% | +83.67% | Add | |
| 1.4% | $69.96M | -23.07% | +0.13% | Add | |
| 1.4% | $68.22M | -26.77% | -16.92% | Trim | |
| 1.3% | $61.94M | +7.37% | -72.89% | Trim | |
| 1.2% | $59.93M | -18.91% | +4.64% | Add | |
| 1.2% | $59.00M | -31.78% | -21.22% | Trim | |
| 1.2% | $57.53M | -37.54% | -1.23% | Trim | |
| 1.2% | $55.79M | -6.02% | +0.15% | Add | |
| 1.1% | $54.46M | -29.70% | +0.51% | Add | |
| 1.1% | $51.55M | -22.99% | +4.51% | Add | |
| 1.1% | $51.41M | -34.62% | +425.58% | Add | |
| 1.0% | $48.58M | -3.06% | +2.51% | Add | |
| 1.0% | $48.41M | -34.26% | +13.48% | Add | |
| 1.0% | $48.04M | -34.51% | +0.43% | Add | |
| 1.0% | $47.11M | -46.94% | +9.62% | Add | |
| 0.9% | $45.85M | +4.86% | +6.32% | Add | |
| 0.9% | $45.43M | -14.06% | +6.15% | Add |
Weight is the share of the reported 13F value, including options at notional value. “Since Jun 30” compares the latest close with the quarter-end price implied by the filing (value ÷ shares).
Largest buys in 2026 Q2
Largest sells in 2026 Q2
Source: SEC Form 13F, values as reported by the filer. Filings lag up to 45 days after quarter end and cover only certain long positions. Research only, not investment advice.