Oberweis Asset Management Inc./
In its 13F for Q3 2025 (holdings as of September 30, 2025, filed November 17, 2025), Oberweis Asset Management Inc./ reported 183 stock positions worth $2.6 billion. Its top holding was Credo Technology Group Holdi (CRDO) at 3.6% of the portfolio, followed by Lumentum (LITE, 2.0%) and Rambus (RMBS, 2.0%). Compared with Q2 2025, it opened 23 new positions, sold out of 25, added to 43 and reduced 40. The biggest buy was Lumentum (LITE, shares +22%) and the biggest sale an exit from Mr Cooper (COOP).
- Most Recent 13F
- Q2 2026
- Location
- LISLE, IL
- CIK
- 0000937886
- Portfolio Value
- $2.6B (Q3 2025)
- SEC Filing
- 0001213900-25-111225 ↗ filed Nov 17, 2025
Holdings Value
Holdings 183 stocks · $2.6B
| CRDO Credo Technology Group Holdi | 3.59% | 643,948 | $93.8M | Reduce -15.1% |
| LITE Lumentum Holdings Inc. | 2.05% | 328,630 | $53.5M | Add +22.1% |
| RMBS Rambus Inc. | 2.03% | 507,899 | $52.9M | Add +0.4% |
| AMBA Ambarella Inc. | 1.93% | 611,360 | $50.4M | Add +6.6% |
| SN Sharkninja Inc. | 1.91% | 482,810 | $49.8M | Reduce -0.4% |
| AAOI Applied Optoelectronics Inc. | 1.87% | 1,888,041 | $49.0M | No change |
| EHC Encompass Health Corp. | 1.75% | 358,800 | $45.6M | Reduce -0.1% |
| FTDR Frontdoor Inc. | 1.57% | 610,860 | $41.1M | No change |
| ADMA Adma Biologics Inc. | 1.52% | 2,712,040 | $39.8M | Reduce -13.5% |
| AMSC American Superconductor Corp. | 1.51% | 665,700 | $39.5M | Reduce -0.4% |
| SRAD Sportradar Group AG-A | 1.42% | 1,379,100 | $37.1M | Add +0.1% |
| NVMI Nova Ltd. | 1.39% | 113,285 | $36.2M | Add +0.2% |
| ITRI Itron Inc. | 1.36% | 284,150 | $35.4M | Reduce -0.1% |
| SKYW Skywest Inc. | 1.27% | 330,790 | $33.3M | Reduce -0.1% |
| SITM Sitime Corp. | 1.23% | 106,396 | $32.1M | Add +44.8% |
| WAY Waystar Holding Corp. | 1.21% | 836,550 | $31.7M | Add +12.3% |
| MRCY Mercury Systems Inc. | 1.18% | 398,500 | $30.8M | No change |
| CLH Clean Harbors Inc. | 1.04% | 116,770 | $27.1M | Reduce -0.5% |
| LRN Stride Inc. | 1.04% | 181,800 | $27.1M | No change |
| BTSG Brightspring Health Services | 1.03% | 908,000 | $26.8M | Add +17.0% |
| PRIM Primoris Services Corp. | 1.01% | 192,400 | $26.4M | No change |
| DOCN Digitalocean Holdings Inc. | 1.01% | 772,000 | $26.4M | Add +22.2% |
| OSIS Osi Systems Inc. | 0.97% | 101,400 | $25.3M | Reduce -7.0% |
| TPC Tutor Perini Corp. | 0.95% | 377,800 | $24.8M | No change |
| VCYT Veracyte Inc. | 0.95% | 721,690 | $24.8M | Reduce -0.7% |
| RSI Rush Street Interactive Inc. | 0.93% | 1,191,560 | $24.4M | Add +11.4% |
| CVLT Commvault Systems Inc. | 0.93% | 128,600 | $24.3M | Add +2.1% |
| FRSH Freshworks Inc. Class A | 0.93% | 2,059,470 | $24.2M | Add +0.4% |
| LTH Life Time Group Holdings Inc. | 0.92% | 866,400 | $23.9M | Add +6.7% |
| QRVO Qorvo Inc. | 0.91% | 260,900 | $23.8M | Add +30.3% |
| PSN Parsons Corp. | 0.87% | 272,730 | $22.6M | Reduce -4.0% |
| CAMT Camtek Ltd. | 0.86% | 213,580 | $22.4M | No change |
| PEGA Pegasystems Inc. | 0.86% | 389,400 | $22.4M | Reduce -0.1% |
| ECG Everus Construction Group | 0.85% | 259,800 | $22.3M | Add +12.9% |
| MTSI Macom Technology Solutions H | 0.85% | 177,790 | $22.1M | Reduce -1.0% |
| LOPE Grand Canyon Education Inc. | 0.84% | 99,800 | $21.9M | Add +10.4% |
| SIMO Silicon Motion Technol-ADR | 0.84% | 230,600 | $21.9M | No change |
| FLS Flowserve Corp. | 0.83% | 409,285 | $21.7M | Reduce -21.6% |
| G Genpact Ltd. | 0.83% | 516,800 | $21.6M | Add +68.8% |
| BLBD Blue Bird Corp. | 0.82% | 373,400 | $21.5M | No change |
| AIR Aar Corp. | 0.81% | 236,500 | $21.2M | No change |
| BROS Dutch Bros Inc. Class A | 0.81% | 404,500 | $21.2M | Add +70.0% |
| QTWO Q2 Holdings Inc. filed as Q2 HLDGS INC | 0.81% | 292,260 | $21.2M | Add +0.1% |
| LEVI Levi Strauss & Co. Class A | 0.81% | 903,500 | $21.1M | New |
| BOX Box Inc. Class A | 0.81% | 652,320 | $21.1M | Reduce -0.2% |
| WGS Genedx Holdings Corp. | 0.80% | 193,920 | $20.9M | Add +19.0% |
| ACA Arcosa Inc. | 0.80% | 221,600 | $20.8M | No change |
| CRS Carpenter Technology | 0.78% | 82,611 | $20.3M | Reduce -0.4% |
| LSCC Lattice Semiconductor Corp. | 0.77% | 275,536 | $20.2M | New |
| FSS Federal Signal Corp. | 0.76% | 166,500 | $19.8M | No change |
| PI Impinj Inc. | 0.74% | 107,120 | $19.4M | New |
| MMSI Merit Medical Systems Inc. | 0.74% | 232,010 | $19.3M | Add +9.0% |
| CARG Cargurus Inc. | 0.74% | 518,400 | $19.3M | No change |
| IMAX Imax Corp. | 0.73% | 579,600 | $19.0M | No change |
| AIZ Assurant Inc. | 0.69% | 83,000 | $18.0M | No change |
| ICUI Icu Medical Inc. | 0.69% | 149,130 | $17.9M | Reduce -1.2% |
| ACIW Aci Worldwide Inc. | 0.67% | 330,702 | $17.5M | Reduce -0.3% |
| EYE National Vision Holdings Inc. | 0.66% | 594,900 | $17.4M | No change |
| FN Fabrinet | 0.64% | 45,900 | $16.7M | Reduce -46.8% |
| URBN Urban Outfitters Inc. | 0.64% | 234,300 | $16.7M | Add +10.5% |
| UCTT Ultra Clean Holdings Inc. | 0.64% | 613,300 | $16.7M | No change |
| AGX Argan Inc. | 0.63% | 60,571 | $16.4M | Reduce -7.9% |
| RELY Remitly Global Inc. | 0.63% | 1,002,800 | $16.3M | Add +68.7% |
| LFUS Littelfuse Inc. | 0.62% | 62,300 | $16.1M | New |
| SFM Sprouts Farmers Market Inc. | 0.61% | 145,500 | $15.8M | Add +27.0% |
| FCFS Firstcash Holdings Inc. | 0.59% | 97,800 | $15.5M | No change |
| ZETA Zeta Global Holdings Corp. Class A | 0.58% | 761,200 | $15.1M | Reduce -33.0% |
| SEI Solaris Energy Infrastructur | 0.56% | 366,900 | $14.7M | No change |
| POWL Powell Industries Inc. | 0.55% | 47,500 | $14.5M | Add +27.7% |
| NYT New York Times Co. Class A | 0.55% | 252,000 | $14.5M | New |
| SPXC SPX Technologies Inc. | 0.55% | 76,900 | $14.4M | No change |
| IRTC Irhythm Holdings Inc. | 0.53% | 81,200 | $14.0M | No change |
| HQY Healthequity Inc. | 0.51% | 140,080 | $13.3M | Add +23.1% |
| EZPW Ezcorp Inc. Class A | 0.50% | 685,500 | $13.1M | No change |
| GDOT Green Dot Corp. Class A | 0.50% | 970,300 | $13.0M | New |
| BMI Badger Meter Inc. | 0.50% | 72,610 | $13.0M | Add +21.2% |
| ANIP Ani Pharmaceuticals Inc. | 0.49% | 138,900 | $12.7M | No change |
| SXT Sensient Technologies Corp. | 0.48% | 134,200 | $12.6M | New |
| GENI Genius Sports Ltd. | 0.48% | 1,015,100 | $12.6M | New |
| ZWS Zurn Elkay Water Solutions C | 0.48% | 266,000 | $12.5M | New |
| TILE Interface Inc. | 0.47% | 425,300 | $12.3M | No change |
| VISN Vistance Networks Inc. filed as COMMSCOPE HLDG CO INC | 0.47% | 790,912 | $12.2M | New |
| AEIS Advanced Energy Industries | 0.45% | 69,700 | $11.9M | Reduce -39.2% |
| KNSA Kiniksa Pharmaceuticals Inte | 0.45% | 305,200 | $11.9M | No change |
| IDCC Interdigital Inc. | 0.45% | 34,100 | $11.8M | No change |
| DIOD Diodes Inc. | 0.45% | 218,700 | $11.6M | No change |
| ABCB Ameris Bancorp | 0.44% | 156,400 | $11.5M | No change |
| MTDR Matador Resources Co. | 0.44% | 253,900 | $11.4M | No change |
| MGNI Magnite Inc. | 0.43% | 514,000 | $11.2M | No change |
| QLYS Qualys Inc. | 0.43% | 84,000 | $11.1M | No change |
| SKWD Skyward Specialty Insurance | 0.42% | 231,800 | $11.0M | Add +76.1% |
| ADPT Adaptive Biotechnologies | 0.42% | 726,500 | $10.9M | Add +23.3% |
| MHO M/I Homes Inc. | 0.40% | 73,200 | $10.6M | Add +25.8% |
| CBSH Commerce Bancshares Inc. | 0.40% | 176,890 | $10.6M | No change |
| CPRX Catalyst Pharmaceuticals Inc. | 0.40% | 528,560 | $10.4M | Add +12.9% |
| OSPN Onespan Inc. | 0.39% | 640,450 | $10.2M | Add +0.8% |
| VRNS Varonis Systems Inc. | 0.39% | 176,600 | $10.1M | No change |
| TPB Turning Point Brands Inc. | 0.38% | 101,000 | $10.0M | No change |
| LMAT Lemaitre Vascular Inc. | 0.38% | 113,767 | $10.0M | Reduce -0.8% |
| OSW Onespaworld Holdings Ltd. | 0.38% | 465,400 | $9.8M | No change |
Portfolio Sells Q2 2025 → Q3 2025
| COOP Mr Cooper Group Inc. | Sold out | 0.00% | −1.01 |
| ADMA Adma Biologics Inc. | Reduce -13.5% | 1.52% | −0.96 |
| PRMB Primo Brands Corp. | Sold out | 0.00% | −0.79 |
| GAP The Gap Inc. | Sold out | 0.00% | −0.75 |
| BRBR Bellring Brands Inc. | Sold out | 0.00% | −0.67 |
| OSCR Oscar Health Inc. Class A | Sold out | 0.00% | −0.54 |
| FN Fabrinet | Reduce -46.8% | 0.64% | −0.46 |
| BFAM Bright Horizons Family Solut | Sold out | 0.00% | −0.43 |
| BPMC Blueprint Medicines Corp. | Sold out | 0.00% | −0.40 |
| NOV Nov Inc. | Sold out | 0.00% | −0.39 |
| FARO Faro Technologies Inc. | Sold out | 0.00% | −0.36 |
| FLS Flowserve Corp. | Reduce -21.6% | 0.83% | −0.36 |
| KEX Kirby Corp. | Sold out | 0.00% | −0.33 |
| GDYN Grid Dynamics Holdings Inc. | Sold out | 0.00% | −0.33 |
| WLDN Willdan Group Inc. | Sold out | 0.00% | −0.30 |
| ACMR Acm Research Inc. Class A | Sold out | 0.00% | −0.28 |
| VRNT Verint Systems Inc. | Sold out | 0.00% | −0.28 |
| ITRI Itron Inc. | Reduce -0.1% | 1.36% | −0.27 |
| STRL Sterling Infrastructure Inc. | Sold out | 0.00% | −0.27 |
| FIVN FIVE9 Inc. | Reduce -28.7% | 0.37% | −0.27 |
| MTSI Macom Technology Solutions H | Reduce -1.0% | 0.85% | −0.27 |
| EOLS Evolus Inc. | Sold out | 0.00% | −0.27 |
| CDNA Caredx Inc. | Sold out | 0.00% | −0.25 |
| DCTH Delcath Systems Inc. | Sold out | 0.00% | −0.25 |
| ARIS WATER SOLUTIONS INC-A | Reduce -91.0% | 0.02% | −0.23 |
| CRS Carpenter Technology | Reduce -0.4% | 0.78% | −0.22 |
| SKYW Skywest Inc. | Reduce -0.1% | 1.27% | −0.21 |
| AEIS Advanced Energy Industries | Reduce -39.2% | 0.45% | −0.21 |
| EIG Employers Holdings Inc. | Sold out | 0.00% | −0.20 |
| ZETA Zeta Global Holdings Corp. Class A | Reduce -33.0% | 0.58% | −0.19 |
| QNST Quinstreet Inc. | Sold out | 0.00% | −0.18 |
| ICUI Icu Medical Inc. | Reduce -1.2% | 0.69% | −0.18 |
| SN Sharkninja Inc. | Reduce -0.4% | 1.91% | −0.18 |
| EHC Encompass Health Corp. | Reduce -0.1% | 1.75% | −0.17 |
| BOX Box Inc. Class A | Reduce -0.2% | 0.81% | −0.17 |
| VTLE Vital Energy Inc. | Sold out | 0.00% | −0.16 |
| MNKD Mannkind Corp. | Sold out | 0.00% | −0.16 |
| CLH Clean Harbors Inc. | Reduce -0.5% | 1.04% | −0.14 |
| HOS Hornbeck Offshore Services I | Sold out | 0.00% | −0.14 |
| SPOT Spotify Technology SA | Reduce -54.8% | 0.07% | −0.13 |
| OSIS Osi Systems Inc. | Reduce -7.0% | 0.97% | −0.10 |
| HALO Halozyme Therapeutics Inc. | Reduce -35.5% | 0.33% | −0.08 |
| REVG Rev Group Inc. | Reduce -22.1% | 0.29% | −0.07 |
| PEGA Pegasystems Inc. | Reduce -0.1% | 0.86% | −0.06 |
| VSEC Vse Corp. | Reduce -23.9% | 0.28% | −0.05 |
| LMAT Lemaitre Vascular Inc. | Reduce -0.8% | 0.38% | −0.03 |
| MMYT Makemytrip Ltd. | Sold out | 0.00% | −0.03 |
| YMM Full Truck Alliance -SPN ADR | Sold out | 0.00% | −0.02 |
| PSN Parsons Corp. | Reduce -4.0% | 0.87% | −0.02 |
| JPM JPMorgan Chase & Co. | Reduce -9.5% | 0.04% | −0.01 |
Portfolio Buys Q2 2025 → Q3 2025
| LITE Lumentum Holdings Inc. | Add +22.1% | 2.05% | +0.93 |
| LEVI Levi Strauss & Co. Class A | New | 0.81% | +0.81 |
| LSCC Lattice Semiconductor Corp. | New | 0.77% | +0.77 |
| PI Impinj Inc. | New | 0.74% | +0.74 |
| LFUS Littelfuse Inc. | New | 0.62% | +0.62 |
| RMBS Rambus Inc. | Add +0.4% | 2.03% | +0.62 |
| NYT New York Times Co. Class A | New | 0.55% | +0.55 |
| SITM Sitime Corp. | Add +44.8% | 1.23% | +0.55 |
| GDOT Green Dot Corp. Class A | New | 0.50% | +0.50 |
| SXT Sensient Technologies Corp. | New | 0.48% | +0.48 |
| GENI Genius Sports Ltd. | New | 0.48% | +0.48 |
| ZWS Zurn Elkay Water Solutions C | New | 0.48% | +0.48 |
| VISN Vistance Networks Inc. | New | 0.47% | +0.47 |
| LIVN Livanova PLC | New | 0.37% | +0.37 |
| AEO American Eagle Outfitters | New | 0.32% | +0.32 |
| LASR Nlight Inc. | New | 0.30% | +0.30 |
| AMBA Ambarella Inc. | Add +6.6% | 1.93% | +0.28 |
| ATEC Alphatec Holdings Inc. | New | 0.26% | +0.26 |
| COUR Coursera Inc. | New | 0.25% | +0.25 |
| G Genpact Ltd. | Add +68.8% | 0.83% | +0.24 |
| RSI Rush Street Interactive Inc. | Add +11.4% | 0.93% | +0.24 |
| BTSG Brightspring Health Services | Add +17.0% | 1.03% | +0.23 |
| BBW Build-A-Bear Workshop Inc. | New | 0.23% | +0.23 |
| DOCN Digitalocean Holdings Inc. | Add +22.2% | 1.01% | +0.22 |
| ECG Everus Construction Group | Add +12.9% | 0.85% | +0.22 |
| PGY Pagaya Technologies Ltd. Class A | New | 0.22% | +0.22 |
| POWL Powell Industries Inc. | Add +27.7% | 0.55% | +0.21 |
| ATRC Atricure Inc. | New | 0.21% | +0.21 |
| XPRO Expro Group Holdings NV | New | 0.20% | +0.20 |
| CECO Ceco Environmental Corp. | New | 0.18% | +0.18 |
| QRVO Qorvo Inc. | Add +30.3% | 0.91% | +0.17 |
| ETON Eton Pharmaceuticals Inc. | New | 0.16% | +0.16 |
| WGS Genedx Holdings Corp. | Add +19.0% | 0.80% | +0.15 |
| RELY Remitly Global Inc. | Add +68.7% | 0.63% | +0.14 |
| CRAI Cra International Inc. | Add +83.7% | 0.28% | +0.12 |
| MHO M/I Homes Inc. | Add +25.8% | 0.40% | +0.12 |
| ADPT Adaptive Biotechnologies | Add +23.3% | 0.42% | +0.12 |
| BROS Dutch Bros Inc. Class A | Add +70.0% | 0.81% | +0.10 |
| LOPE Grand Canyon Education Inc. | Add +10.4% | 0.84% | +0.10 |
| SKWD Skyward Specialty Insurance | Add +76.1% | 0.42% | +0.09 |
| CRMD Cormedix Inc. | Add +62.0% | 0.35% | +0.09 |
| LINC Lincoln Educational Services | Add +59.1% | 0.27% | +0.08 |
| DAVE Dave Inc. | Add +87.6% | 0.35% | +0.06 |
| NGVC Natural Grocers BY Vitamin C | Add +34.8% | 0.34% | +0.06 |
| SHOP Shopify Inc. Class A | New | 0.06% | +0.06 |
| NVMI Nova Ltd. | Add +0.2% | 1.39% | +0.03 |
| SE Sea Ltd.-ADR | Add +23.2% | 0.12% | +0.02 |
| CLBT Cellebrite Di Ltd. | Add +4.7% | 0.29% | +0.02 |
| AOSL Alpha & Omega Semiconductor | Add +11.0% | 0.29% | +0.02 |
| CAT Caterpillar Inc. | New | 0.01% | +0.01 |
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 |