Holders — by stockHoldings — by fund
OBERWEIS ASSET MANAGEMENT INC/
Everything this manager disclosed owning in US-listed stocks — its complete Form 13F portfolio · as of 2026-06-30 · filed with the SEC up to 45 days after quarter end · CIK 0000937886
$4.84B
disclosed book value
176
positions
5.7%
largest position share
Positions, as of 2026-06-30
top 100 of 176 · 13F covers long US-listed positions only — cash, bonds, private and foreign stakes are not disclosed · PUT/CALL tags = options positions (share-equivalents), not shares held
| # | Issuer | Shares | Value | % of book |
|---|---|---|---|---|
| 1 | Credo Technology Group | 1.0M | $275.6M | 5.7% |
| 2 | AAOIApplied Optoelectronics Inc. | 1.8M | $265.4M | 5.5% |
| 3 | DOCNDigitalOcean Holdings, Inc. | 930,005 | $146.0M | 3% |
| 4 | SIMOSilicon Motion Techn ADR | 316,350 | $105.4M | 2.2% |
| 5 | UCTTUltra Clean Holdings | 647,276 | $92.3M | 1.9% |
| 6 | SharkNinja, Inc. | 593,500 | $90.4M | 1.9% |
| 7 | SITMSiTime Corporation | 119,501 | $89.1M | 1.8% |
| 8 | BTSGBrightSpring Health Services | 1.2M | $82.7M | 1.7% |
| 9 | HNGEHinge Health, Inc. | 855,476 | $71.0M | 1.5% |
| 10 | RMBSRambus, Inc | 527,016 | $70.0M | 1.4% |
| 11 | MTSIMacom Technology Solutions | 179,356 | $68.2M | 1.4% |
| 12 | LITELumentum Hldgs, Inc. | 72,185 | $61.9M | 1.3% |
| 13 | LSCCLattice Semiconductor Corporat | 391,816 | $59.9M | 1.2% |
| 14 | Nova Ltd. | 108,675 | $59.0M | 1.2% |
| 15 | CRSCarpenter Technology Corp. | 93,273 | $57.5M | 1.2% |
| 16 | FTDRFrontdoor, Inc. | 719,060 | $55.8M | 1.2% |
| 17 | ECGEverus Construction Group | 328,183 | $54.5M | 1.1% |
| 18 | VCYTVeracyte, Inc. | 877,734 | $51.5M | 1.1% |
| 19 | POWLPowell Industries Inc. | 179,521 | $51.4M | 1.1% |
| 20 | LTHLife Time Holdings, Inc. | 1.2M | $48.6M | 1% |
| 21 | RSIRush Street Interactive, Inc. | 1.6M | $48.4M | 1% |
| 22 | MRCYMercury Systems, Inc. | 392,723 | $48.0M | 1% |
| 23 | BROSDutch Bros., Inc. | 656,093 | $47.1M | 1% |
| 24 | CLHClean Harbors, Inc. | 153,475 | $45.9M | 0.9% |
| 25 | SEISolaris Energy Infrastructur | 564,581 | $45.4M | 0.9% |
| 26 | DIODDiodes, Inc. | 413,750 | $45.3M | 0.9% |
| 27 | ACAArcosa, Inc. | 295,450 | $42.9M | 0.9% |
| 28 | BLBDBlue Bird Corporation | 529,838 | $41.8M | 0.9% |
| 29 | Camtek, Ltd. | 253,380 | $41.3M | 0.9% |
| 30 | LivaNova Plc | 500,150 | $41.1M | 0.8% |
| 31 | AMSCAmerican Superconductor | 987,500 | $41.0M | 0.8% |
| 32 | MXLMaxlinear, Inc. Class A | 319,500 | $40.9M | 0.8% |
| 33 | GMEDGlobus Medical, Inc.-A | 512,100 | $40.5M | 0.8% |
| 34 | NOVTNovanta, Inc. | 244,260 | $39.6M | 0.8% |
| 35 | SKYWSkywest Inc | 383,799 | $38.1M | 0.8% |
| 36 | VIAVViavi Solutions, Inc. | 793,600 | $37.9M | 0.8% |
| 37 | MOG/AMoog Inc. - A | 86,735 | $36.8M | 0.8% |
| 38 | LFUSLittelfuse, Inc. | 79,800 | $36.3M | 0.8% |
| 39 | ARQTArcutis Biotherapeutics, Inc. | 1.4M | $36.0M | 0.7% |
| 40 | FCFSFirstCash Holdings, Inc | 166,105 | $35.9M | 0.7% |
| 41 | BLLNBilliontoone, Inc. | 299,030 | $35.9M | 0.7% |
| 42 | DANDana Inc. | 1.3M | $35.9M | 0.7% |
| 43 | ESIElement Solutions, Inc. | 740,100 | $35.3M | 0.7% |
| 44 | AIRAAR Corp. | 246,325 | $35.2M | 0.7% |
| 45 | RELYRemitly Global, Inc. | 1.6M | $35.2M | 0.7% |
| 46 | ICUIICU Medical, Inc. | 237,050 | $34.8M | 0.7% |
| 47 | FSSFederal Signal Corp. | 269,084 | $34.6M | 0.7% |
| 48 | OUSTOuster, Inc. | 545,810 | $34.1M | 0.7% |
| 49 | LEVILevi Strauss & Co. | 1.4M | $33.7M | 0.7% |
| 50 | MMSIMerit Medical System Inc | 473,409 | $32.8M | 0.7% |
| 51 | AIZAssurant, Inc. | 122,100 | $32.8M | 0.7% |
| 52 | WAYWaystar Holding Corp. | 1.6M | $32.6M | 0.7% |
| 53 | CECOCECO Environmental Corp. | 358,072 | $32.5M | 0.7% |
| 54 | LQDALiquidia Corp. | 406,400 | $32.4M | 0.7% |
| 55 | EHCEncompass Health Corporation | 316,886 | $32.0M | 0.7% |
| 56 | INDVIndivior Plc | 779,188 | $32.0M | 0.7% |
| 57 | CGNXCognex Corp. | 427,820 | $31.0M | 0.6% |
| 58 | GVAGranite Construction | 193,090 | $30.5M | 0.6% |
| 59 | PDFSPdf Solutions, Inc. | 426,400 | $30.2M | 0.6% |
| 60 | NVSTEnvista Holdings Corp. | 1.1M | $29.5M | 0.6% |
| 61 | DAVEDave, Inc. | 78,902 | $29.4M | 0.6% |
| 62 | Ambarella, Inc. | 342,254 | $29.4M | 0.6% |
| 63 | LASRnLIGHT Inc. | 413,310 | $28.8M | 0.6% |
| 64 | MYRGMYR Group, Inc. | 54,190 | $27.1M | 0.6% |
| 65 | ADPTAdaptive Biotechnologies | 1.3M | $27.0M | 0.6% |
| 66 | DRSLeonardo DRS, Inc. | 628,486 | $26.8M | 0.6% |
| 67 | TPCTutor Perini Corp. | 323,200 | $26.8M | 0.6% |
| 68 | KGSKodiak Gas Services, Inc. | 355,870 | $26.7M | 0.6% |
| 69 | Kiniksa Pharmaceuticals, Ltd. | 413,034 | $26.4M | 0.5% |
| 70 | CHYMChime Financial Inc. | 1.3M | $26.0M | 0.5% |
| 71 | ALHCAlighnment Healthcare, Inc. | 1.1M | $25.9M | 0.5% |
| 72 | HALOHalozyme Therapeutics, Inc. | 321,030 | $25.1M | 0.5% |
| 73 | IRTCIrhythm Holdings, Inc. | 202,004 | $24.0M | 0.5% |
| 74 | ABCBAmeris Bancorp | 264,600 | $23.9M | 0.5% |
| 75 | ZWSZurn Elkay Water Solutions Cor | 468,453 | $23.7M | 0.5% |
| 76 | OSISOsi Systems, Inc. | 107,143 | $23.4M | 0.5% |
| 77 | OMDAOmada Health, Inc. | 1.0M | $23.0M | 0.5% |
| 78 | URBNUrban Outfitters, Inc. | 316,192 | $22.4M | 0.5% |
| 79 | ANIPANI Pharmaceuticals, Inc. | 265,306 | $22.0M | 0.5% |
| 80 | EZPWEZCorp, Inc. | 631,800 | $21.8M | 0.5% |
| 81 | CNRCore Natural Resources, Inc. | 271,170 | $21.7M | 0.4% |
| 82 | DCODucommun Inc. | 113,800 | $21.1M | 0.4% |
| 83 | SKWDSkyward Specialty Ins Group | 359,100 | $21.0M | 0.4% |
| 84 | WLDNWilldan Group Inc. | 262,700 | $20.8M | 0.4% |
| 85 | ATENA10 Networks, Inc. | 552,000 | $20.6M | 0.4% |
| 86 | HQYHealthEquity Inc. | 228,291 | $20.6M | 0.4% |
| 87 | Super Group SGHC Ltd. | 1.5M | $20.6M | 0.4% |
| 88 | SPXCSPX Technologies, Inc. | 83,811 | $20.5M | 0.4% |
| 89 | FORMFormfactor Inc. | 127,330 | $20.4M | 0.4% |
| 90 | WTSWatts Water Technologies | 50,840 | $19.9M | 0.4% |
| 91 | OPLNOpenlane, Inc. | 480,580 | $19.8M | 0.4% |
| 92 | QTWOQ2 Holdings, Inc. | 410,409 | $19.7M | 0.4% |
| 93 | BOXBox, Inc. | 743,000 | $19.7M | 0.4% |
| 94 | VSECVSE Corp. | 86,098 | $19.7M | 0.4% |
| 95 | BHEBenchmark Electronics Inc | 198,300 | $19.6M | 0.4% |
| 96 | NYTNew York Times Co. Cl A | 277,050 | $19.4M | 0.4% |
| 97 | AEISAdvanced Energy Industry, Inc. | 49,423 | $18.4M | 0.4% |
| 98 | ETONEton Pharmaceuticals, Inc. | 501,600 | $18.2M | 0.4% |
| 99 | AXGNAxoGen Inc. | 388,194 | $17.9M | 0.4% |
| 100 | Fabrinet | 30,373 | $17.1M | 0.4% |
Source: SEC Form 13F-HR, reporting period 2026-06-30. Values are the manager's filed June-30-style quarter-end marks, not live prices. Research, not investment advice.