Oberweis Asset Management Inc./
In its 13F for Q2 2024 (holdings as of June 30, 2024, filed August 14, 2024), Oberweis Asset Management Inc./ reported 197 stock positions worth $1.6 billion. Its top holding was Weatherford International PL (WFRD) at 2.2% of the portfolio, followed by Constellium (CSTM, 2.1%) and Sharkninja (SN, 1.8%). Compared with Q1 2024, it opened 28 new positions, sold out of 27, added to 99 and reduced 28. The biggest buy was Credo Technology Group Holdi (CRDO, shares +142%) and the biggest sale Amphastar Pharmaceuticals (AMPH, shares −68%).
- Most Recent 13F
- Q2 2026
- Location
- LISLE, IL
- CIK
- 0000937886
- Portfolio Value
- $1.6B (Q2 2024)
- SEC Filing
- 0001213900-24-068757 ↗ filed Aug 14, 2024
Holdings Value
Holdings 197 stocks · $1.6B
| WFRD Weatherford International PL | 2.20% | 292,770 | $35.8M | Add +31.8% |
| CSTM Constellium SE | 2.12% | 1,838,871 | $34.7M | Add +2.0% |
| SN Sharkninja Inc. | 1.82% | 394,660 | $29.7M | Add +67.8% |
| ONTO Onto Innovation Inc. | 1.74% | 129,545 | $28.4M | Add +21.1% |
| TMDX Transmedics Group Inc. | 1.73% | 187,090 | $28.2M | Reduce -5.6% |
| ZETA Zeta Global Holdings Corp. Class A | 1.72% | 1,588,380 | $28.0M | Add +34.4% |
| EHC Encompass Health Corp. | 1.54% | 292,187 | $25.1M | Add +43.1% |
| CRDO Credo Technology Group Holdi | 1.53% | 780,330 | $24.9M | Add +142.4% |
| SKYW Skywest Inc. | 1.46% | 291,050 | $23.9M | Add +10.9% |
| CLH Clean Harbors Inc. | 1.43% | 103,245 | $23.3M | Add +27.0% |
| ADMA Adma Biologics Inc. | 1.40% | 2,040,700 | $22.8M | Reduce -26.9% |
| SIMO Silicon Motion Technol-ADR | 1.38% | 277,300 | $22.5M | Add +27.6% |
| CAMT Camtek Ltd. | 1.37% | 178,180 | $22.3M | No change |
| OLED Universal Display Corp. | 1.29% | 100,048 | $21.0M | Add +29.2% |
| OSK Oshkosh Corp. | 1.21% | 182,786 | $19.8M | Add +36.6% |
| CROX Crocs Inc. | 1.14% | 127,100 | $18.5M | Add +33.2% |
| FORM Formfactor Inc. | 1.13% | 305,780 | $18.5M | Add +29.2% |
| FLS Flowserve Corp. | 1.09% | 370,134 | $17.8M | Add +34.9% |
| LIVN Livanova PLC | 1.08% | 322,685 | $17.7M | Add +59.4% |
| MMSI Merit Medical Systems Inc. | 1.02% | 193,840 | $16.7M | Add +23.9% |
| ICFI Icf International Inc. | 1.02% | 111,900 | $16.6M | Add +15.5% |
| ACIW Aci Worldwide Inc. | 1.00% | 412,662 | $16.3M | Add +19.8% |
| ANF Abercrombie & Fitch Co. Class A | 0.99% | 90,700 | $16.1M | Add +88.6% |
| BLBD Blue Bird Corp. | 0.99% | 299,100 | $16.1M | No change |
| RAMP Liveramp Holdings Inc. | 0.97% | 512,630 | $15.9M | Add +73.3% |
| HIMS Hims & Hers Health Inc. | 0.97% | 785,000 | $15.8M | New |
| UCTT Ultra Clean Holdings Inc. | 0.96% | 319,600 | $15.7M | No change |
| AMSC American Superconductor Corp. | 0.95% | 664,400 | $15.5M | Add +4.7% |
| CCS Century Communities Inc. | 0.95% | 190,100 | $15.5M | Add +56.9% |
| ITRI Itron Inc. | 0.92% | 152,400 | $15.1M | Add +21.3% |
| ELF Elf Beauty Inc. | 0.90% | 69,920 | $14.7M | Add +59.9% |
| ESAB Esab Corp. | 0.87% | 150,700 | $14.2M | Add +16.6% |
| WWD Woodward Inc. | 0.87% | 81,600 | $14.2M | Add +19.3% |
| VCYT Veracyte Inc. | 0.87% | 654,100 | $14.2M | Reduce -2.6% |
| TDW Tidewater Inc. | 0.86% | 148,095 | $14.1M | New |
| ATEC Alphatec Holdings Inc. | 0.85% | 1,327,360 | $13.9M | Reduce -4.2% |
| AVAV Aerovironment Inc. | 0.85% | 76,040 | $13.9M | Reduce -25.1% |
| ITGR Integer Holdings Corp. | 0.85% | 119,200 | $13.8M | Add +23.3% |
| HAE Haemonetics Corp. | 0.84% | 165,295 | $13.7M | Add +15.0% |
| VECO Veeco Instruments Inc. | 0.84% | 291,900 | $13.6M | Add +8.5% |
| NXT Nextpower Inc. filed as NEXTRACKER INC | 0.80% | 278,900 | $13.1M | Add +18.3% |
| ACLS Axcelis Technologies Inc. | 0.80% | 91,799 | $13.1M | Reduce -56.1% |
| FSS Federal Signal Corp. | 0.80% | 155,330 | $13.0M | Add +21.5% |
| AZEK The Azek Co. Inc. | 0.79% | 304,800 | $12.8M | Add +38.0% |
| CBT Cabot Corp. | 0.76% | 134,500 | $12.4M | Add +46.0% |
| PSN Parsons Corp. | 0.75% | 149,120 | $12.2M | Reduce -13.4% |
| SLAB Silicon Laboratories Inc. | 0.74% | 109,500 | $12.1M | Add +40.4% |
| INFA Informatica Inc. Class A | 0.72% | 379,800 | $11.7M | Add +22.9% |
| IBP Installed Building Products | 0.70% | 55,700 | $11.5M | Add +83.2% |
| CECO Ceco Environmental Corp. | 0.70% | 394,700 | $11.4M | Reduce -14.8% |
| TNDM Tandem Diabetes Care Inc. | 0.70% | 282,000 | $11.4M | New |
| VRT Vertiv Holdings Co. Class A | 0.68% | 128,810 | $11.2M | Reduce -43.9% |
| SPXC SPX Technologies Inc. | 0.65% | 74,500 | $10.6M | Add +8.0% |
| PRIM Primoris Services Corp. | 0.64% | 209,900 | $10.5M | No change |
| WING Wingstop Inc. | 0.63% | 24,400 | $10.3M | Add +22.0% |
| AIZ Assurant Inc. | 0.63% | 61,900 | $10.3M | Add +37.6% |
| ACMR Acm Research Inc. Class A | 0.62% | 441,130 | $10.2M | No change |
| FTDR Frontdoor Inc. | 0.61% | 295,500 | $10.0M | Add +12.2% |
| YOU Clear Secure Inc. Class A | 0.60% | 523,200 | $9.8M | Add +4.5% |
| MSA Msa Safety Inc. | 0.59% | 51,000 | $9.6M | Add +15.4% |
| BMI Badger Meter Inc. | 0.58% | 51,200 | $9.5M | New |
| OSIS Osi Systems Inc. | 0.58% | 69,200 | $9.5M | Add +25.1% |
| MMS Maximus Inc. | 0.58% | 110,600 | $9.5M | Add +23.3% |
| LMB Limbach Holdings Inc. | 0.58% | 164,800 | $9.4M | No change |
| RSI Rush Street Interactive Inc. | 0.57% | 971,900 | $9.3M | Add +25.1% |
| NEO Neogenomics Inc. | 0.57% | 668,700 | $9.3M | Reduce -9.3% |
| STRA Strategic Education Inc. | 0.57% | 83,800 | $9.3M | New |
| KWR Quaker Chemical Corporation | 0.57% | 54,400 | $9.2M | Add +34.3% |
| DECK Deckers Outdoor Corp. | 0.56% | 9,450 | $9.1M | Add +0.3% |
| SFM Sprouts Farmers Market Inc. | 0.56% | 108,500 | $9.1M | Add +67.7% |
| INSW International Seaways Inc. | 0.55% | 151,600 | $9.0M | Reduce -23.7% |
| BOOT Boot Barn Holdings Inc. | 0.55% | 69,400 | $8.9M | Add +27.6% |
| MYGN Myriad Genetics Inc. | 0.54% | 360,700 | $8.8M | New |
| LRN Stride Inc. | 0.53% | 123,300 | $8.7M | Add +86.8% |
| FCFS Firstcash Holdings Inc. | 0.53% | 82,200 | $8.6M | Reduce -10.4% |
| LMAT Lemaitre Vascular Inc. | 0.51% | 100,703 | $8.3M | Add +25.9% |
| CRS Carpenter Technology | 0.50% | 74,700 | $8.2M | Add +20.9% |
| KRYS Krystal Biotech Inc. | 0.48% | 42,600 | $7.8M | Add +19.3% |
| RXST Rxsight Inc. | 0.47% | 126,640 | $7.6M | No change |
| PETQ Petiq Inc. | 0.46% | 340,700 | $7.5M | No change |
| FIX Comfort Systems USA Inc. | 0.45% | 24,100 | $7.3M | Add +21.7% |
| AORT Artivion Inc. | 0.44% | 282,400 | $7.2M | No change |
| LOPE Grand Canyon Education Inc. | 0.44% | 51,600 | $7.2M | Add +19.4% |
| CLBT Cellebrite Di Ltd. | 0.44% | 603,600 | $7.2M | Add +51.7% |
| AAOI Applied Optoelectronics Inc. | 0.44% | 865,915 | $7.2M | Add +1.9% |
| EZPW Ezcorp Inc. Class A | 0.44% | 685,500 | $7.2M | No change |
| PFBC Preferred Bank/Los Angeles | 0.44% | 95,000 | $7.2M | No change |
| CPRX Catalyst Pharmaceuticals Inc. | 0.44% | 458,400 | $7.1M | No change |
| JBI Janus International Group Inc. | 0.43% | 560,900 | $7.1M | Reduce -19.3% |
| PRMW Primo Water Corp. | 0.43% | 323,500 | $7.1M | No change |
| FN Fabrinet | 0.42% | 27,900 | $6.8M | Add +27.4% |
| AOSL Alpha & Omega Semiconductor | 0.41% | 180,000 | $6.7M | New |
| MGY Magnolia Oil & Gas Corp. Class A | 0.41% | 263,500 | $6.7M | Add +42.7% |
| TREX Trex Company Inc. | 0.41% | 89,500 | $6.6M | Add +48.9% |
| MTDR Matador Resources Co. | 0.41% | 111,100 | $6.6M | Add +34.8% |
| PLAB Photronics Inc. | 0.40% | 266,000 | $6.6M | Add +3.9% |
| PLYA Playa Hotels & Resorts NV | 0.40% | 772,500 | $6.5M | Add +2.8% |
| OSW Onespaworld Holdings Ltd. | 0.40% | 420,400 | $6.5M | No change |
| OSCR Oscar Health Inc. Class A | 0.40% | 407,500 | $6.4M | Add +38.1% |
| ALGM Allegro Microsystems Inc. | 0.39% | 226,100 | $6.4M | Add +2.2% |
Portfolio Sells Q1 2024 → Q2 2024
| AMPH Amphastar Pharmaceuticals Inc. | Reduce -67.7% | 0.33% | −1.00 |
| ACLS Axcelis Technologies Inc. | Reduce -56.1% | 0.80% | −0.89 |
| ACHC Acadia Healthcare Co. Inc. | Sold out | 0.00% | −0.87 |
| AXONICS INC | Sold out | 0.00% | −0.82 |
| EVH Evolent Health Inc. Class A | Sold out | 0.00% | −0.80 |
| VRT Vertiv Holdings Co. Class A | Reduce -43.9% | 0.68% | −0.67 |
| GO Grocery Outlet Holding Corp. | Sold out | 0.00% | −0.62 |
| STRL Sterling Infrastructure Inc. | Reduce -71.7% | 0.20% | −0.57 |
| ATEC Alphatec Holdings Inc. | Reduce -4.2% | 0.85% | −0.53 |
| AEHR Aehr Test Systems | Reduce -44.8% | 0.37% | −0.50 |
| IPAR Interparfums Inc. | Sold out | 0.00% | −0.49 |
| MCRI Monarch Casino & Resort Inc. | Sold out | 0.00% | −0.47 |
| GIII G-III Apparel Group Ltd. | Sold out | 0.00% | −0.46 |
| MOD Modine Manufacturing Co. | Sold out | 0.00% | −0.44 |
| SSD Simpson Manufacturing Co. Inc. | Sold out | 0.00% | −0.37 |
| SNCY Sun Country Airlines Holding | Sold out | 0.00% | −0.36 |
| RPD RAPID7 Inc. | Sold out | 0.00% | −0.34 |
| JBI Janus International Group Inc. | Reduce -19.3% | 0.43% | −0.33 |
| HEES H&E Equipment Services Inc. | Sold out | 0.00% | −0.32 |
| FCFS Firstcash Holdings Inc. | Reduce -10.4% | 0.53% | −0.32 |
| AAON Aaon Inc. | Sold out | 0.00% | −0.31 |
| NOV Nov Inc. | Sold out | 0.00% | −0.31 |
| DY Dycom Industries Inc. | Sold out | 0.00% | −0.30 |
| JELD Jeld-Wen Holding Inc. | Sold out | 0.00% | −0.30 |
| PSN Parsons Corp. | Reduce -13.4% | 0.75% | −0.28 |
| AVAV Aerovironment Inc. | Reduce -25.1% | 0.85% | −0.28 |
| HNI Hni Corp. | Sold out | 0.00% | −0.27 |
| NEO Neogenomics Inc. | Reduce -9.3% | 0.57% | −0.27 |
| RES RPC Inc. | Reduce -23.9% | 0.24% | −0.22 |
| ATI Ati Inc. | Reduce -37.5% | 0.30% | −0.22 |
| INSW International Seaways Inc. | Reduce -23.7% | 0.55% | −0.21 |
| VCYT Veracyte Inc. | Reduce -2.6% | 0.87% | −0.21 |
| DVAX Dynavax Technologies Corp. | Reduce -28.4% | 0.23% | −0.19 |
| QTRX Quanterix Corp. | Sold out | 0.00% | −0.17 |
| AXGN Axogen Inc. | Sold out | 0.00% | −0.17 |
| BASE Couchbase Inc. | Sold out | 0.00% | −0.17 |
| SIBN Si-Bone Inc. | Reduce -11.1% | 0.22% | −0.15 |
| HURN Huron Consulting Group Inc. | Reduce -17.7% | 0.24% | −0.10 |
| CECO Ceco Environmental Corp. | Reduce -14.8% | 0.70% | −0.07 |
| CDNS Cadence Design SYS Inc. | Reduce -2.3% | 0.24% | −0.05 |
| LI Li Auto Inc. - ADR | Sold out | 0.00% | −0.05 |
| ARCO Arcos Dorados Holdings Inc. Class A | Reduce -61.8% | 0.02% | −0.05 |
| MNSO Miniso Group Holding Ltd.-ADR | Sold out | 0.00% | −0.04 |
| REVG Rev Group Inc. | Reduce -12.8% | 0.17% | −0.03 |
| LEGN Legend Biotech Corp.-ADR | Sold out | 0.00% | −0.02 |
| PDD PDD Holdings Inc. | Reduce -17.2% | 0.10% | −0.02 |
| TAL Tal Education Group- ADR | Sold out | 0.00% | −0.02 |
| VTEX Vtex Class A | Reduce -36.5% | 0.02% | −0.02 |
| CELH Celsius Holdings Inc. | Sold out | 0.00% | −0.02 |
| AS Amer Sports Inc. | Sold out | 0.00% | −0.02 |
Portfolio Buys Q1 2024 → Q2 2024
| CRDO Credo Technology Group Holdi | Add +142.4% | 1.53% | +1.03 |
| HIMS Hims & Hers Health Inc. | New | 0.97% | +0.97 |
| TDW Tidewater Inc. | New | 0.86% | +0.86 |
| ZETA Zeta Global Holdings Corp. Class A | Add +34.4% | 1.72% | +0.78 |
| SN Sharkninja Inc. | Add +67.8% | 1.82% | +0.76 |
| TNDM Tandem Diabetes Care Inc. | New | 0.70% | +0.70 |
| BMI Badger Meter Inc. | New | 0.58% | +0.58 |
| STRA Strategic Education Inc. | New | 0.57% | +0.57 |
| ANF Abercrombie & Fitch Co. Class A | Add +88.6% | 0.99% | +0.55 |
| MYGN Myriad Genetics Inc. | New | 0.54% | +0.54 |
| AOSL Alpha & Omega Semiconductor | New | 0.41% | +0.41 |
| BROS Dutch Bros Inc. Class A | New | 0.39% | +0.39 |
| SPSC SPS Commerce Inc. | New | 0.37% | +0.37 |
| FORM Formfactor Inc. | Add +29.2% | 1.13% | +0.35 |
| OLED Universal Display Corp. | Add +29.2% | 1.29% | +0.35 |
| WFRD Weatherford International PL | Add +31.8% | 2.20% | +0.34 |
| ONTO Onto Innovation Inc. | Add +21.1% | 1.74% | +0.34 |
| ADUS Addus Homecare Corp. | New | 0.34% | +0.34 |
| AMSC American Superconductor Corp. | Add +4.7% | 0.95% | +0.33 |
| KEX Kirby Corp. | New | 0.33% | +0.33 |
| EHC Encompass Health Corp. | Add +43.1% | 1.54% | +0.32 |
| QTWO Q2 Holdings Inc. | New | 0.31% | +0.31 |
| VRNT Verint Systems Inc. | New | 0.30% | +0.30 |
| OSPN Onespan Inc. | New | 0.29% | +0.29 |
| ELF Elf Beauty Inc. | Add +59.9% | 0.90% | +0.28 |
| LIVN Livanova PLC | Add +59.4% | 1.08% | +0.27 |
| SFM Sprouts Farmers Market Inc. | Add +67.7% | 0.56% | +0.25 |
| CLH Clean Harbors Inc. | Add +27.0% | 1.43% | +0.25 |
| CDNA Caredx Inc. | New | 0.24% | +0.24 |
| RAMP Liveramp Holdings Inc. | Add +73.3% | 0.97% | +0.23 |
| LRN Stride Inc. | Add +86.8% | 0.53% | +0.23 |
| RSI Rush Street Interactive Inc. | Add +25.1% | 0.57% | +0.21 |
| DESP Despegar.com Corp. | Add +1124.9% | 0.22% | +0.20 |
| WGS Genedx Holdings Corp. | New | 0.20% | +0.20 |
| FLS Flowserve Corp. | Add +34.9% | 1.09% | +0.18 |
| CRS Carpenter Technology | Add +20.9% | 0.50% | +0.18 |
| BOOT Boot Barn Holdings Inc. | Add +27.6% | 0.55% | +0.17 |
| ACIW Aci Worldwide Inc. | Add +19.8% | 1.00% | +0.17 |
| ARDX Ardelyx Inc. | New | 0.17% | +0.17 |
| SIMO Silicon Motion Technol-ADR | Add +27.6% | 1.38% | +0.17 |
| MMSI Merit Medical Systems Inc. | Add +23.9% | 1.02% | +0.16 |
| MGNI Magnite Inc. | New | 0.16% | +0.16 |
| ULH Universal Logistics Holdings | New | 0.15% | +0.15 |
| SKYW Skywest Inc. | Add +10.9% | 1.46% | +0.15 |
| VECO Veeco Instruments Inc. | Add +8.5% | 0.84% | +0.15 |
| CROX Crocs Inc. | Add +33.2% | 1.14% | +0.14 |
| CBT Cabot Corp. | Add +46.0% | 0.76% | +0.14 |
| WLDN Willdan Group Inc. | New | 0.14% | +0.14 |
| AXTI Axt Inc. | New | 0.14% | +0.14 |
| USAP Universal Stainless & Alloy | New | 0.14% | +0.14 |
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 |