Oberweis Asset Management Inc/
Institutional manager — quarterly 13F holdings, Q ending 2026-03-31
Reported value
$3.39B
Q ending 2026-03-31
Prior quarter
$2.73B
Q ending 2025-12-31
Change
+23.8% QoQ · +68.8% YoY
Positions
180
reported holdings
Largest positions
Top 100 of 180 reported positions by value, Q ending 2026-03-31. A manager can hold shares, calls and puts on the same security at once — such positions are listed as separate rows. Type: Shares = common stock, Put/Call = option positions (valued at the underlying), Principal = debt. Tickers link to stock pages where covered.
| Holding | Ticker | Type | Value ▼ | Shares |
|---|---|---|---|---|
| Applied Optoelectronics Inc. | AAOI | Shares | $198.8M | 2.3M |
| Lumentum Hldgs, Inc. | LITE | Shares | $187.1M | 266K |
| Credo Technology Group | Shares | $95.9M | 1.0M | |
| Digitalocean Holdings, Inc. | DOCN | Shares | $79.6M | 928K |
| Sharkninja, Inc. | Shares | $63.5M | 600K | |
| Nova Ltd. | Shares | $59.9M | 138K | |
| Dana Inc. | DAN | Shares | $54.2M | 1.6M |
| Brightspring Health Services | BTSG | Shares | $49.4M | 1.2M |
| Macom Technology Solutions | MTSI | Shares | $47.9M | 216K |
| Rambus, Inc | RMBS | Shares | $45.3M | 526K |
| Clean Harbors, Inc. | CLH | Shares | $41.4M | 144K |
| Sitime Corporation | SITM | Shares | $41.2M | 119K |
| Ultra Clean Holdings | UCTT | Shares | $39.8M | 640K |
| Everus Construction Group | ECG | Shares | $38.6M | 327K |
| Frontdoor, Inc. | FTDR | Shares | $38.0M | 718K |
| Carpenter Technology Corp. | CRS | Shares | $37.2M | 94K |
| Skywest Inc | SKYW | Shares | $36.0M | 392K |
| Lattice Semiconductor Corporat | LSCC | Shares | $34.7M | 374K |
| Globus Medical, Inc.-A | GMED | Shares | $33.8M | 392K |
| Camtek, Ltd. | Shares | $33.8M | 223K | |
| Arcutis Biotherapeutics, Inc. | ARQT | Shares | $32.2M | 1.4M |
| Flowserve Corporation | FLS | Shares | $32.0M | 435K |
| Silicon Motion Techn Adr | SIMO | Shares | $31.7M | 283K |
| Life Time Holdings, Inc. | LTH | Shares | $31.3M | 1.2M |
| Rush Street Interactive, Inc. | RSI | Shares | $31.2M | 1.4M |
| Firstcash Holdings, Inc | FCFS | Shares | $31.1M | 166K |
| Fastly, Inc. | FSLY | Shares | $31.1M | 1.1M |
| Tutor Perini Corp. | TPC | Shares | $30.4M | 394K |
| Dutch Bros., Inc. | BROS | Shares | $30.3M | 598K |
| Solaris Energy Infrastructur | SEI | Shares | $30.1M | 532K |
| Merit Medical System Inc | MMSI | Shares | $29.2M | 424K |
| Federal Signal Corp. | FSS | Shares | $28.9M | 268K |
| American Superconductor | AMSC | Shares | $28.8M | 850K |
| Mercury Systems, Inc. | MRCY | Shares | $28.5M | 391K |
| Arcosa, Inc. | ACA | Shares | $28.4M | 268K |
| Osi Systems, Inc. | OSIS | Shares | $28.3M | 107K |
| Core Natural Resources, Inc. | CNR | Shares | $28.3M | 270K |
| Waystar Holding Corp. | WAY | Shares | $28.1M | 1.2M |
| Encompass Health Corporation | EHC | Shares | $28.0M | 289K |
| Veracyte, Inc. | VCYT | Shares | $27.1M | 840K |
| Aar Corp. | AIR | Shares | $26.8M | 245K |
| Icu Medical, Inc. | ICUI | Shares | $26.3M | 204K |
| Littelfuse, Inc. | LFUS | Shares | $24.4M | 72K |
| Primoris Services Corp. | PRIM | Shares | $23.8M | 166K |
| Remitly Global, Inc. | RELY | Shares | $22.8M | 1.5M |
| Genpact Ltd. | Shares | $22.6M | 607K | |
| Assurant, Inc. | AIZ | Shares | $22.3M | 102K |
| Blue Bird Corporation | BLBD | Shares | $22.1M | 389K |
| Imax Corp. | IMAX | Shares | $21.9M | 577K |
| Levi Strauss & Co. | LEVI | Shares | $21.6M | 1.2M |
| Alphatec Hldgs Inc. | ATEC | Shares | $20.8M | 1.9M |
| Nlight Inc. | LASR | Shares | $20.7M | 363K |
| National Vision Holdings, Inc. | EYE | Shares | $20.7M | 798K |
| Ameris Bancorp | ABCB | Shares | $20.6M | 264K |
| Livanova Plc | Shares | $20.5M | 322K | |
| Leonardo Drs, Inc. | DRS | Shares | $20.0M | 450K |
| Urban Outfitters, Inc. | URBN | Shares | $19.9M | 315K |
| Indivior Plc | INDV | Shares | $19.9M | 653K |
| Grand Canyon Education, Inc. | LOPE | Shares | $19.9M | 117K |
| Vistance Networks, Inc. | VISN | Shares | $19.9M | 1.1M |
| Matador Resources Company | MTDR | Shares | $19.8M | 313K |
| Viavi Solutions, Inc. | VIAV | Shares | $19.7M | 593K |
| Chime Financial Inc. | CHYM | Shares | $19.4M | 1.0M |
| Pegasystems Inc. | PEGA | Shares | $19.4M | 455K |
| Catalyst Pharmaceuticals, Inc. | Shares | $19.3M | 781K | |
| Q2 Holdings, Inc. | QTWO | Shares | $18.7M | 395K |
| Powell Industries Inc. | POWL | Shares | $18.5M | 34K |
| Irhythm Holdings, Inc. | IRTC | Shares | $18.4M | 156K |
| Box, Inc. | BOX | Shares | $18.2M | 772K |
| Argan, Inc | AGX | Shares | $18.1M | 33K |
| Hinge Health, Inc. | HNGE | Shares | $18.0M | 466K |
| New York Times Co. Cl A | NYT | Shares | $17.7M | 212K |
| American Eagle Outfitters | AEO | Shares | $17.4M | 1.0M |
| Alighnment Healthcare, Inc. | ALHC | Shares | $17.0M | 967K |
| Ani Pharmaceuticals, Inc. | ANIP | Shares | $17.0M | 221K |
| Envista Holdings Corp. | NVST | Shares | $16.9M | 665K |
| Genedx Holdings Corp. | WGS | Shares | $16.8M | 261K |
| Spx Technologies, Inc. | SPXC | Shares | $16.7M | 83K |
| Shake Shack, Inc. | SHAK | Shares | $16.6M | 188K |
| Calix, Inc. | CALX | Shares | $16.4M | 335K |
| Super Group Sghc Ltd. | Shares | $16.4M | 1.5M | |
| Ezcorp, Inc. | EZPW | Shares | $16.2M | 639K |
| Lemaitre Vascular, Inc. | LMAT | Shares | $16.2M | 149K |
| Advanced Energy Industry, Inc. | AEIS | Shares | $15.9M | 49K |
| Zurn Elkay Water Solutions Cor | ZWS | Shares | $15.8M | 352K |
| Fabrinet | Shares | $15.8M | 30K | |
| Kiniksa Pharmaceuticals, Ltd. | Shares | $15.3M | 319K | |
| Phibro Animal Health Corp | PAHC | Shares | $15.3M | 277K |
| Diodes, Inc. | DIOD | Shares | $15.3M | 224K |
| Ambarella, Inc. | Shares | $15.2M | 295K | |
| Pediatrix Medical Group, Inc. | MD | Shares | $15.0M | 701K |
| Magnolia Oil & Gas Corp. | MGY | Shares | $14.3M | 454K |
| Skyward Specialty Ins Group | SKWD | Shares | $14.3M | 327K |
| Halozyme Therapeutics, Inc. | HALO | Shares | $14.2M | 220K |
| Liquidia Corp. | LQDA | Shares | $14.0M | 372K |
| Arlo Technologies, Inc. | ARLO | Shares | $14.0M | 982K |
| Healthequity Inc. | HQY | Shares | $13.9M | 167K |
| Propetro Holding Corp. | PUMP | Shares | $13.9M | 966K |
| Zeta Global Holdings Corp. | ZETA | Shares | $13.9M | 871K |
| Mirion Technologies, Inc. | MIR | Shares | $13.8M | 744K |
Values as reported in public regulatory filings (USD); holdings are reported quarterly, up to 45 days after quarter end, and may contain reporting errors. Nothing here is investment advice.