Oberweis Asset Management Inc./
In its 13F for Q2 2026 (holdings as of June 30, 2026, filed August 14, 2026), Oberweis Asset Management Inc./ reported 175 stock positions worth $4.8 billion. Its top holding was Credo Technology Group Holdi (CRDO) at 5.7% of the portfolio, followed by Applied Optoelectronics (AAOI, 5.5%) and Digitalocean (DOCN, 3.0%). Compared with Q1 2026, it opened 23 new positions, sold out of 27, added to 113 and reduced 27. The biggest buy was Silicon Motion Technol-ADR (SIMO, shares +12%) and the biggest sale Lumentum (LITE, shares −73%).
- Most Recent 13F
- Q2 2026
- Location
- LISLE, IL
- CIK
- 0000937886
- Portfolio Value
- $4.8B (Q2 2026)
- SEC Filing
- 0001213900-26-089777 ↗ filed Aug 14, 2026
Holdings Value
Holdings 175 stocks · $4.8B
| CRDO Credo Technology Group Holdi | 5.70% | 1,013,428 | $275.6M | Reduce -0.8% |
| AAOI Applied Optoelectronics Inc. | 5.48% | 1,791,127 | $265.4M | Reduce -23.8% |
| DOCN Digitalocean Holdings Inc. | 3.02% | 930,005 | $146.0M | Add +0.3% |
| SIMO Silicon Motion Technol-ADR | 2.18% | 316,350 | $105.4M | Add +12.0% |
| UCTT Ultra Clean Holdings Inc. | 1.91% | 647,276 | $92.3M | Add +1.1% |
| SN Sharkninja Inc. | 1.87% | 593,500 | $90.4M | Reduce -1.1% |
| SITM Sitime Corp. | 1.84% | 119,501 | $89.1M | Add +0.2% |
| BTSG Brightspring Health Services | 1.71% | 1,185,280 | $82.7M | Add +2.3% |
| HNGE Hinge Health Inc. Class A | 1.47% | 855,476 | $71.0M | Add +83.7% |
| RMBS Rambus Inc. | 1.45% | 527,016 | $70.0M | Add +0.1% |
| MTSI Macom Technology Solutions H | 1.41% | 179,356 | $68.2M | Reduce -16.9% |
| LITE Lumentum Holdings Inc. | 1.28% | 72,185 | $61.9M | Reduce -72.9% |
| LSCC Lattice Semiconductor Corp. | 1.24% | 391,816 | $59.9M | Add +4.6% |
| NVMI Nova Ltd. | 1.22% | 108,675 | $59.0M | Reduce -21.2% |
| CRS Carpenter Technology | 1.19% | 93,273 | $57.5M | Reduce -1.2% |
| FTDR Frontdoor Inc. | 1.15% | 719,060 | $55.8M | Add +0.1% |
| ECG Everus Construction Group | 1.13% | 328,183 | $54.5M | Add +0.5% |
| VCYT Veracyte Inc. | 1.07% | 877,734 | $51.5M | Add +4.5% |
| POWL Powell Industries Inc. | 1.06% | 179,521 | $51.4M | Add +75.2% |
| LTH Life Time Group Holdings Inc. | 1.00% | 1,189,620 | $48.6M | Add +2.5% |
| RSI Rush Street Interactive Inc. | 1.00% | 1,627,930 | $48.4M | Add +13.5% |
| MRCY Mercury Systems Inc. | 0.99% | 392,723 | $48.0M | Add +0.4% |
| BROS Dutch Bros Inc. Class A | 0.97% | 656,093 | $47.1M | Add +9.6% |
| CLH Clean Harbors Inc. | 0.95% | 153,475 | $45.9M | Add +6.3% |
| SEI Solaris Energy Infrastructur | 0.94% | 564,581 | $45.4M | Add +6.2% |
| DIOD Diodes Inc. | 0.94% | 413,750 | $45.3M | Add +84.5% |
| ACA Arcosa Inc. | 0.89% | 295,450 | $42.9M | Add +10.4% |
| BLBD Blue Bird Corp. | 0.86% | 529,838 | $41.8M | Add +36.1% |
| CAMT Camtek Ltd. | 0.85% | 253,380 | $41.3M | Add +13.7% |
| LIVN Livanova PLC | 0.85% | 500,150 | $41.1M | Add +55.4% |
| AMSC American Superconductor Corp. | 0.85% | 987,500 | $41.0M | Add +16.2% |
| MXL Maxlinear Inc. | 0.85% | 319,500 | $40.9M | New |
| GMED Globus Medical Inc. Class A | 0.84% | 512,100 | $40.5M | Add +30.6% |
| NOVT Novanta Inc. | 0.82% | 244,260 | $39.6M | New |
| SKYW Skywest Inc. | 0.79% | 383,799 | $38.1M | Reduce -2.2% |
| VIAV Viavi Solutions Inc. | 0.78% | 793,600 | $37.9M | Add +33.8% |
| MOG.A Moog Inc. Class A | 0.76% | 86,735 | $36.8M | Add +93.1% |
| LFUS Littelfuse Inc. | 0.75% | 79,800 | $36.3M | Add +11.1% |
| ARQT Arcutis Biotherapeutics Inc. | 0.74% | 1,372,941 | $36.0M | Add +0.5% |
| FCFS Firstcash Holdings Inc. | 0.74% | 166,105 | $35.9M | Add +0.3% |
| BLLN Billiontoone Inc. Class A | 0.74% | 299,030 | $35.9M | New |
| DAN Dana Inc. | 0.74% | 1,318,300 | $35.9M | Reduce -18.2% |
| ESI Element Solutions Inc. | 0.73% | 740,100 | $35.3M | New |
| AIR Aar Corp. | 0.73% | 246,325 | $35.2M | Add +0.5% |
| RELY Remitly Global Inc. | 0.73% | 1,570,400 | $35.2M | Add +8.0% |
| ICUI Icu Medical Inc. | 0.72% | 237,050 | $34.8M | Add +16.4% |
| FSS Federal Signal Corp. | 0.71% | 269,084 | $34.6M | Add +0.5% |
| OUST Ouster Inc. | 0.71% | 545,810 | $34.1M | New |
| LEVI Levi Strauss & Co. Class A | 0.70% | 1,358,100 | $33.7M | Add +16.4% |
| MMSI Merit Medical Systems Inc. | 0.68% | 473,409 | $32.8M | Add +11.6% |
| AIZ Assurant Inc. | 0.68% | 122,100 | $32.8M | Add +19.4% |
| WAY Waystar Holding Corp. | 0.67% | 1,589,364 | $32.6M | Add +36.1% |
| CECO Ceco Environmental Corp. | 0.67% | 358,072 | $32.5M | Add +165.2% |
| LQDA Liquidia Corp. | 0.67% | 406,400 | $32.4M | Add +9.2% |
| EHC Encompass Health Corp. | 0.66% | 316,886 | $32.0M | Add +9.5% |
| INDV Indivior Pharmaceuticals Inc. | 0.66% | 779,188 | $32.0M | Add +19.3% |
| CGNX Cognex Corp. | 0.64% | 427,820 | $31.0M | New |
| GVA Granite Construction Inc. | 0.63% | 193,090 | $30.5M | New |
| PDFS PDF Solutions Inc. | 0.62% | 426,400 | $30.2M | New |
| NVST Envista Holdings Corp. | 0.61% | 1,120,782 | $29.5M | Add +68.4% |
| DAVE Dave Inc. | 0.61% | 78,902 | $29.4M | Add +18.3% |
| AMBA Ambarella Inc. | 0.61% | 342,254 | $29.4M | Add +15.9% |
| LASR Nlight Inc. | 0.59% | 413,310 | $28.8M | Add +13.9% |
| MYRG MYR Group Inc./Delaware | 0.56% | 54,190 | $27.1M | New |
| ADPT Adaptive Biotechnologies | 0.56% | 1,258,751 | $27.0M | Add +56.0% |
| DRS Leonardo DRS Inc. | 0.55% | 628,486 | $26.8M | Add +39.8% |
| TPC Tutor Perini Corp. | 0.55% | 323,200 | $26.8M | Reduce -17.9% |
| KGS Kodiak Gas Services Inc. | 0.55% | 355,870 | $26.7M | New |
| KNSA Kiniksa Pharmaceuticals Inte | 0.55% | 413,034 | $26.4M | Add +29.6% |
| CHYM Chime Financial Inc. Class A | 0.54% | 1,268,330 | $26.0M | Add +22.5% |
| ALHC Alignment Healthcare Inc. | 0.54% | 1,089,600 | $25.9M | Add +12.7% |
| HALO Halozyme Therapeutics Inc. | 0.52% | 321,030 | $25.1M | Add +46.0% |
| IRTC Irhythm Holdings Inc. | 0.50% | 202,004 | $24.0M | Add +29.5% |
| ABCB Ameris Bancorp | 0.49% | 264,600 | $23.9M | Add +0.4% |
| ZWS Zurn Elkay Water Solutions C | 0.49% | 468,453 | $23.7M | Add +33.0% |
| OSIS Osi Systems Inc. | 0.48% | 107,143 | $23.4M | Add +0.5% |
| OMDA Omada Health Inc. | 0.48% | 1,048,800 | $23.0M | New |
| URBN Urban Outfitters Inc. | 0.46% | 316,192 | $22.4M | Add +0.4% |
| ANIP Ani Pharmaceuticals Inc. | 0.45% | 265,306 | $22.0M | Add +19.8% |
| EZPW Ezcorp Inc. Class A | 0.45% | 631,800 | $21.8M | Reduce -1.2% |
| CNR Core Natural Resources Inc. | 0.45% | 271,170 | $21.7M | Add +0.5% |
| DCO Ducommun Inc. | 0.44% | 113,800 | $21.1M | Add +13.9% |
| SKWD Skyward Specialty Insurance | 0.43% | 359,100 | $21.0M | Add +9.8% |
| WLDN Willdan Group Inc. | 0.43% | 262,700 | $20.8M | New |
| ATEN A10 Networks Inc. | 0.43% | 552,000 | $20.6M | Add +9.5% |
| HQY Healthequity Inc. | 0.43% | 228,291 | $20.6M | Add +37.0% |
| SGHC Super Group SGHC Ltd. | 0.43% | 1,521,000 | $20.6M | Add +0.4% |
| SPXC SPX Technologies Inc. | 0.42% | 83,811 | $20.5M | Add +0.4% |
| FORM Formfactor Inc. | 0.42% | 127,330 | $20.4M | New |
| WTS Watts Water Technologies-A | 0.41% | 50,840 | $19.9M | New |
| OPLN Openlane Inc. | 0.41% | 480,580 | $19.8M | New |
| QTWO Q2 Holdings Inc. filed as Q2 HLDGS INC | 0.41% | 410,409 | $19.7M | Add +4.0% |
| BOX Box Inc. Class A | 0.41% | 743,000 | $19.7M | Reduce -3.7% |
| VSEC Vse Corp. | 0.41% | 86,098 | $19.7M | Add +153.2% |
| BHE Benchmark Electronics Inc. | 0.40% | 198,300 | $19.6M | Reduce -1.8% |
| NYT New York Times Co. Class A | 0.40% | 277,050 | $19.4M | Add +30.9% |
| AEIS Advanced Energy Industries | 0.38% | 49,423 | $18.4M | Add +0.5% |
| ETON Eton Pharmaceuticals Inc. | 0.38% | 501,600 | $18.2M | Add +14.2% |
| AXGN Axogen Inc. | 0.37% | 388,194 | $17.9M | Add +13.4% |
| FN Fabrinet | 0.35% | 30,373 | $17.1M | Add +0.4% |
Other holdings (1): bonds, preferreds, convertibles and warrants · $260K (not counted above)
| Security | Class | Shares / Principal | Value | Change |
|---|---|---|---|---|
| WELLS FARGO & COMPANY (WFC 7.5 PERP L) | PERP PFD CNV A | 225 | $260K | No change |
Total filed on the 13F, all lines: $4.8B.
Portfolio Sells Q1 2026 → Q2 2026
| LITE Lumentum Holdings Inc. | Reduce -72.9% | 1.28% | −4.25 |
| FLS Flowserve Corp. | Sold out | 0.00% | −0.94 |
| DAN Dana Inc. | Reduce -18.2% | 0.74% | −0.86 |
| PRIM Primoris Services Corp. | Sold out | 0.00% | −0.70 |
| G Genpact Ltd. | Sold out | 0.00% | −0.67 |
| ATEC Alphatec Holdings Inc. | Sold out | 0.00% | −0.61 |
| EYE National Vision Holdings Inc. | Sold out | 0.00% | −0.61 |
| FSLY Fastly Inc. Class A | Reduce -20.4% | 0.32% | −0.60 |
| PEGA Pegasystems Inc. | Sold out | 0.00% | −0.57 |
| NVMI Nova Ltd. | Reduce -21.2% | 1.22% | −0.55 |
| AEO American Eagle Outfitters | Sold out | 0.00% | −0.52 |
| WGS Genedx Holdings Corp. | Sold out | 0.00% | −0.50 |
| SHAK Shake Shack Inc. Class A | Sold out | 0.00% | −0.49 |
| MIR Mirion Technologies Inc. | Sold out | 0.00% | −0.41 |
| AAOI Applied Optoelectronics Inc. | Reduce -23.8% | 5.48% | −0.39 |
| CPRX Catalyst Pharmaceuticals Inc. | Reduce -62.4% | 0.19% | −0.38 |
| IMAX Imax Corp. | Reduce -43.4% | 0.27% | −0.38 |
| PI Impinj Inc. | Sold out | 0.00% | −0.36 |
| TPC Tutor Perini Corp. | Reduce -17.9% | 0.55% | −0.34 |
| LOPE Grand Canyon Education Inc. | Reduce -20.9% | 0.27% | −0.31 |
| QLYS Qualys Inc. | Sold out | 0.00% | −0.31 |
| SKYW Skywest Inc. | Reduce -2.2% | 0.79% | −0.28 |
| AORT Artivion Inc. | Sold out | 0.00% | −0.24 |
| XPRO Expro Group Holdings NV | Sold out | 0.00% | −0.23 |
| THR Thermon Group Holdings Inc. | Sold out | 0.00% | −0.23 |
| LINC Lincoln Educational Services | Sold out | 0.00% | −0.23 |
| AGX Argan Inc. | Reduce -36.6% | 0.35% | −0.19 |
| CRAI Cra International Inc. | Sold out | 0.00% | −0.17 |
| HURN Huron Consulting Group Inc. | Sold out | 0.00% | −0.16 |
| TCMD Tactile Systems Technology I | Sold out | 0.00% | −0.16 |
| PDS Precision Drilling Corp. | Reduce -1.6% | 0.18% | −0.15 |
| COUR Coursera Inc. | Sold out | 0.00% | −0.14 |
| BRCB Black Rock Coffee Bar Inc. Class A | Sold out | 0.00% | −0.14 |
| BOX Box Inc. Class A | Reduce -3.7% | 0.41% | −0.13 |
| CLMB Climb Global Solutions Inc. | Sold out | 0.00% | −0.12 |
| MD Pediatrix Medical Group Inc. | Reduce -11.1% | 0.33% | −0.12 |
| COCO The Vita Coco Co. Inc. | Reduce -46.4% | 0.11% | −0.11 |
| ZETA Zeta Global Holdings Corp. Class A | Reduce -5.9% | 0.33% | −0.08 |
| RDWR Radware Ltd. | Reduce -0.2% | 0.18% | −0.04 |
| RCKY Rocky Brands Inc. | Reduce -0.3% | 0.10% | −0.03 |
| HTHT H World Group Ltd.-ADR | Reduce -66.7% | 0.01% | −0.03 |
| EZPW Ezcorp Inc. Class A | Reduce -1.2% | 0.45% | −0.03 |
| FUTU Futu Holdings Ltd.-ADR | Sold out | 0.00% | −0.02 |
| WEAV Weave Communications Inc. | Sold out | 0.00% | −0.01 |
| SN Sharkninja Inc. | Reduce -1.1% | 1.87% | −0.01 |
| GLD SPDR Gold Shares | Sold out | 0.00% | −0.01 |
| IBEX Ibex Ltd. | Sold out | 0.00% | −0.01 |
| XOM Exxon Mobil Corp. | Sold out | 0.00% | −0.01 |
| MTSI Macom Technology Solutions H | Reduce -16.9% | 1.41% | −0.01 |
| CAT Caterpillar Inc. | Reduce -19.6% | 0.01% | −0.00 |
Portfolio Buys Q1 2026 → Q2 2026
| SIMO Silicon Motion Technol-ADR | Add +12.0% | 2.18% | +1.24 |
| HNGE Hinge Health Inc. Class A | Add +83.7% | 1.47% | +0.94 |
| MXL Maxlinear Inc. | New | 0.85% | +0.85 |
| NOVT Novanta Inc. | New | 0.82% | +0.82 |
| BLLN Billiontoone Inc. Class A | New | 0.74% | +0.74 |
| UCTT Ultra Clean Holdings Inc. | Add +1.1% | 1.91% | +0.73 |
| ESI Element Solutions Inc. | New | 0.73% | +0.73 |
| OUST Ouster Inc. | New | 0.71% | +0.71 |
| DOCN Digitalocean Holdings Inc. | Add +0.3% | 3.02% | +0.67 |
| CGNX Cognex Corp. | New | 0.64% | +0.64 |
| GVA Granite Construction Inc. | New | 0.63% | +0.63 |
| SITM Sitime Corp. | Add +0.2% | 1.84% | +0.62 |
| PDFS PDF Solutions Inc. | New | 0.62% | +0.62 |
| MYRG MYR Group Inc./Delaware | New | 0.56% | +0.56 |
| KGS Kodiak Gas Services Inc. | New | 0.55% | +0.55 |
| POWL Powell Industries Inc. | Add +75.2% | 1.06% | +0.52 |
| DIOD Diodes Inc. | Add +84.5% | 0.94% | +0.48 |
| OMDA Omada Health Inc. | New | 0.48% | +0.48 |
| CECO Ceco Environmental Corp. | Add +165.2% | 0.67% | +0.43 |
| WLDN Willdan Group Inc. | New | 0.43% | +0.43 |
| FORM Formfactor Inc. | New | 0.42% | +0.42 |
| WTS Watts Water Technologies-A | New | 0.41% | +0.41 |
| OPLN Openlane Inc. | New | 0.41% | +0.41 |
| MOG.A Moog Inc. Class A | Add +93.1% | 0.76% | +0.37 |
| TRS Trimas Corp. | New | 0.34% | +0.34 |
| INOD Innodata Inc. | New | 0.30% | +0.30 |
| VCYT Veracyte Inc. | Add +4.5% | 1.07% | +0.27 |
| DAVE Dave Inc. | Add +18.3% | 0.61% | +0.26 |
| LQDA Liquidia Corp. | Add +9.2% | 0.67% | +0.25 |
| BTSG Brightspring Health Services | Add +2.3% | 1.71% | +0.25 |
| LIVN Livanova PLC | Add +55.4% | 0.85% | +0.25 |
| ADPT Adaptive Biotechnologies | Add +56.0% | 0.56% | +0.23 |
| VVX V2X Inc. | New | 0.23% | +0.23 |
| VSEC Vse Corp. | Add +153.2% | 0.41% | +0.22 |
| LSCC Lattice Semiconductor Corp. | Add +4.6% | 1.24% | +0.21 |
| BLBD Blue Bird Corp. | Add +36.1% | 0.86% | +0.21 |
| VIAV Viavi Solutions Inc. | Add +33.8% | 0.78% | +0.20 |
| KFRC Kforce Inc. | New | 0.17% | +0.17 |
| AMBA Ambarella Inc. | Add +15.9% | 0.61% | +0.16 |
| MRCY Mercury Systems Inc. | Add +0.4% | 0.99% | +0.15 |
| XPRO Expro Ltd. | New | 0.14% | +0.14 |
| CHEF The Chefs' Warehouse Inc. | New | 0.11% | +0.11 |
| NVST Envista Holdings Corp. | Add +68.4% | 0.61% | +0.11 |
| RMBS Rambus Inc. | Add +0.1% | 1.45% | +0.11 |
| HALO Halozyme Therapeutics Inc. | Add +46.0% | 0.52% | +0.10 |
| KNSA Kiniksa Pharmaceuticals Inte | Add +29.6% | 0.55% | +0.09 |
| ATEN A10 Networks Inc. | Add +9.5% | 0.43% | +0.08 |
| LTH Life Time Group Holdings Inc. | Add +2.5% | 1.00% | +0.08 |
| RSI Rush Street Interactive Inc. | Add +13.5% | 1.00% | +0.08 |
| BROS Dutch Bros Inc. Class A | Add +9.6% | 0.97% | +0.08 |
All Filings
| Quarter | Positions | 13F Reported Value | Top Holdings |
|---|---|---|---|
| Q2 2026 | 175 | $4.8B | CRDO, AAOI, DOCN, SIMO, UCTT |
| Q1 2026 | 179 | $3.4B | AAOI, LITE, CRDO, DOCN, SN |
| Q4 2025 | 178 | $2.7B | LITE, CRDO, AAOI, SN, AMBA |
| Q3 2025 | 183 | $2.6B | CRDO, LITE, RMBS, AMBA, SN |
| Q2 2025 | 185 | $2.3B | CRDO, ADMA, AAOI, SN, EHC |
| Q1 2025 | 192 | $2.0B | ADMA, CRDO, SN, EHC, DOCS |
| Q4 2024 | 196 | $2.1B | CRDO, ADMA, SN, ZETA, SKYW |
| Q3 2024 | 206 | $2.0B | ADMA, SN, ZETA, EHC, WFRD |
| Q2 2024 | 197 | $1.6B | WFRD, CSTM, SN, ONTO, TMDX |
| Q1 2024 | 196 | $1.4B | CSTM, WFRD, ACLS, ONTO, ATEC |