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OBERWEIS ASSET MANAGEMENT INC/
Period ended Jun 30, 2026 · Latest filing Aug 14, 2026
These quarterly holdings are delayed and may not include all assets or short positions.
Values are from the reporting date, not current prices or purchase costs.
The same security may appear in multiple rows.
Source: SEC
Reported portfolio value
Quarter-end reported holdings; not current value or investment performance.
View reported values
- Jun 30, 2026: $4,839,542,355
More quarters will appear as history becomes available.
Top holdings
Top 10 at Jun 30, 2026. Matching entries are combined; security classes and options remain separate. Shares exclude principal amounts; option shares reflect the reported underlying amount.
View top holdings values
- Credo Technology Group · COM · G25457105 · shares: $275,601,745
- Applied Optoelectronics Inc. · COM · 03823U102 · shares: $265,373,376
- DigitalOcean Holdings, Inc. · COM · 25402D102 · shares: $146,038,685
- Silicon Motion Techn ADR · COM · 82706C108 · shares: $105,448,946
- Ultra Clean Holdings · COM · 90385V107 · shares: $92,295,085
- SharkNinja, Inc. · COM · G8068L108 · shares: $90,372,245
- SiTime Corporation · COM · 82982T106 · shares: $89,095,166
- BrightSpring Health Services · COM · 10950A106 · shares: $82,661,427
- Hinge Health, Inc. · COM · 433313103 · shares: $71,004,508
- Rambus, Inc · COM · 750917106 · shares: $69,956,104
Reported holdings
176 reported entries| Issuer | Class | CUSIP | Type | Shares / principal | Reported value (USD) |
|---|---|---|---|---|---|
| Credo Technology Group | COM | G25457105 | — | 1,013,428 shares | $275,601,745 |
| Applied Optoelectronics Inc. | COM | 03823U102 | — | 1,791,127 shares | $265,373,376 |
| DigitalOcean Holdings, Inc. | COM | 25402D102 | — | 930,005 shares | $146,038,685 |
| Silicon Motion Techn ADR | COM | 82706C108 | — | 316,350 shares | $105,448,946 |
| Ultra Clean Holdings | COM | 90385V107 | — | 647,276 shares | $92,295,085 |
| SharkNinja, Inc. | COM | G8068L108 | — | 593,500 shares | $90,372,245 |
| SiTime Corporation | COM | 82982T106 | — | 119,501 shares | $89,095,166 |
| BrightSpring Health Services | COM | 10950A106 | — | 1,185,280 shares | $82,661,427 |
| Hinge Health, Inc. | COM | 433313103 | — | 855,476 shares | $71,004,508 |
| Rambus, Inc | COM | 750917106 | — | 527,016 shares | $69,956,104 |
| Macom Technology Solutions | COM | 55405Y100 | — | 179,356 shares | $68,221,642 |
| Lumentum Hldgs, Inc. | COM | 55024U109 | — | 72,185 shares | $61,939,061 |
| Lattice Semiconductor Corporat | COM | 518415104 | — | 391,816 shares | $59,932,175 |
| Nova Ltd. | COM | M7516K103 | — | 108,675 shares | $59,004,005 |
| Carpenter Technology Corp. | COM | 144285103 | — | 93,273 shares | $57,534,775 |
| Frontdoor, Inc. | COM | 35905A109 | — | 719,060 shares | $55,791,865 |
| Everus Construction Group | COM | 300426103 | — | 328,183 shares | $54,461,969 |
| Veracyte, Inc. | COM | 92337F107 | — | 877,734 shares | $51,549,318 |
| Powell Industries Inc. | COM | 739128106 | — | 179,521 shares | $51,407,634 |
| Life Time Holdings, Inc. | COM | 53190C102 | — | 1,189,620 shares | $48,584,081 |
| Rush Street Interactive, Inc. | COM | 782011100 | — | 1,627,930 shares | $48,414,638 |
| Mercury Systems, Inc. | COM | 589378108 | — | 392,723 shares | $48,041,805 |
| Dutch Bros., Inc. | COM | 26701L100 | — | 656,093 shares | $47,114,038 |
| Clean Harbors, Inc. | COM | 184496107 | — | 153,475 shares | $45,850,656 |
| Solaris Energy Infrastructur | COM | 83418M103 | — | 564,581 shares | $45,426,174 |
| Diodes, Inc. | COM | 254543101 | — | 413,750 shares | $45,280,800 |
| Arcosa, Inc. | COM | 039653100 | — | 295,450 shares | $42,925,931 |
| Blue Bird Corporation | COM | 095306106 | — | 529,838 shares | $41,836,008 |
| Camtek, Ltd. | COM | M20791105 | — | 253,380 shares | $41,331,346 |
| LivaNova Plc | COM | G5509L101 | — | 500,150 shares | $41,127,335 |
| American Superconductor | COM | 030111207 | — | 987,500 shares | $40,991,125 |
| Maxlinear, Inc. Class A | COM | 57776J100 | — | 319,500 shares | $40,905,585 |
| Globus Medical, Inc.-A | COM | 379577208 | — | 512,100 shares | $40,461,021 |
| Novanta, Inc. | COM | 67000B104 | — | 244,260 shares | $39,628,742 |
| Skywest Inc | COM | 830879102 | — | 383,799 shares | $38,122,755 |
| Viavi Solutions, Inc. | COM | 925550105 | — | 793,600 shares | $37,894,400 |
| Moog Inc. - A | COM | 615394202 | — | 86,735 shares | $36,761,762 |
| Littelfuse, Inc. | COM | 537008104 | — | 79,800 shares | $36,335,334 |
| Arcutis Biotherapeutics, Inc. | COM | 03969K108 | — | 1,372,941 shares | $35,998,513 |
| FirstCash Holdings, Inc | COM | 33768G107 | — | 166,105 shares | $35,931,834 |
| Billiontoone, Inc. | COM | 090168105 | — | 299,030 shares | $35,877,619 |
| Dana Inc. | COM | 235825205 | — | 1,318,300 shares | $35,870,943 |
| Element Solutions, Inc. | COM | 28618M106 | — | 740,100 shares | $35,339,775 |
| AAR Corp. | COM | 000361105 | — | 246,325 shares | $35,207,232 |
| Remitly Global, Inc. | COM | 75960P104 | — | 1,570,400 shares | $35,192,664 |
| ICU Medical, Inc. | COM | 44930G107 | — | 237,050 shares | $34,751,530 |
| Federal Signal Corp. | COM | 313855108 | — | 269,084 shares | $34,574,603 |
| Ouster, Inc. | COM | 68989M202 | — | 545,810 shares | $34,124,041 |
| Levi Strauss & Co. | COM | 52736R102 | — | 1,358,100 shares | $33,721,623 |
| Merit Medical System Inc | COM | 589889104 | — | 473,409 shares | $32,826,180 |
| Assurant, Inc. | COM | 04621X108 | — | 122,100 shares | $32,787,513 |
| Waystar Holding Corp. | COM | 946784105 | — | 1,589,364 shares | $32,629,643 |
| CECO Environmental Corp. | COM | 125141101 | — | 358,072 shares | $32,491,453 |
| Liquidia Corp. | COM | 53635D202 | — | 406,400 shares | $32,402,272 |
| Encompass Health Corporation | COM | 29261A100 | — | 316,886 shares | $32,030,840 |
| Indivior Plc | COM | 45579U109 | — | 779,188 shares | $31,970,084 |
| Cognex Corp. | COM | 192422103 | — | 427,820 shares | $30,982,724 |
| Granite Construction | COM | 387328107 | — | 193,090 shares | $30,523,667 |
| Pdf Solutions, Inc. | COM | 693282105 | — | 426,400 shares | $30,184,856 |
| Envista Holdings Corp. | COM | 29415F104 | — | 1,120,782 shares | $29,532,606 |
| Dave, Inc. | COM | 23834J201 | — | 78,902 shares | $29,398,096 |
| Ambarella, Inc. | COM | G037AX101 | — | 342,254 shares | $29,365,393 |
| nLIGHT Inc. | COM | 65487K100 | — | 413,310 shares | $28,774,642 |
| MYR Group, Inc. | COM | 55405W104 | — | 54,190 shares | $27,116,676 |
| Adaptive Biotechnologies | COM | 00650F109 | — | 1,258,751 shares | $27,000,209 |
| Leonardo DRS, Inc. | COM | 52661A108 | — | 628,486 shares | $26,817,498 |
| Tutor Perini Corp. | COM | 901109108 | — | 323,200 shares | $26,815,904 |
| Kodiak Gas Services, Inc. | COM | 50012A108 | — | 355,870 shares | $26,736,513 |
| Kiniksa Pharmaceuticals, Ltd. | COM | G52694109 | — | 413,034 shares | $26,413,524 |
| Chime Financial Inc. | COM | 16935C109 | — | 1,268,330 shares | $25,975,398 |
| Alighnment Healthcare, Inc. | COM | 01625V104 | — | 1,089,600 shares | $25,943,376 |
| Halozyme Therapeutics, Inc. | COM | 40637H109 | — | 321,030 shares | $25,127,018 |
| Irhythm Holdings, Inc. | COM | 450056106 | — | 202,004 shares | $24,028,376 |
| Ameris Bancorp | COM | 03076K108 | — | 264,600 shares | $23,882,796 |
| Zurn Elkay Water Solutions Cor | COM | 98983L108 | — | 468,453 shares | $23,670,930 |
| Osi Systems, Inc. | COM | 671044105 | — | 107,143 shares | $23,432,174 |
| Omada Health, Inc. | COM | 68170A108 | — | 1,048,800 shares | $23,021,160 |
| Urban Outfitters, Inc. | COM | 917047102 | — | 316,192 shares | $22,405,365 |
| ANI Pharmaceuticals, Inc. | COM | 00182C103 | — | 265,306 shares | $21,962,031 |
| EZCorp, Inc. | COM | 302301106 | — | 631,800 shares | $21,841,326 |
| Core Natural Resources, Inc. | COM | 218937100 | — | 271,170 shares | $21,699,023 |
| Ducommun Inc. | COM | 264147109 | — | 113,800 shares | $21,076,898 |
| Skyward Specialty Ins Group | COM | 830940102 | — | 359,100 shares | $20,953,485 |
| Willdan Group Inc. | COM | 96924N100 | — | 262,700 shares | $20,779,570 |
| A10 Networks, Inc. | COM | 002121101 | — | 552,000 shares | $20,622,720 |
| HealthEquity Inc. | COM | 42226A107 | — | 228,291 shares | $20,619,243 |
| Super Group SGHC Ltd. | COM | G8588X103 | — | 1,521,000 shares | $20,609,550 |
| SPX Technologies, Inc. | COM | 78473E103 | — | 83,811 shares | $20,547,943 |
| Formfactor Inc. | COM | 346375108 | — | 127,330 shares | $20,363,887 |
| Watts Water Technologies | COM | 942749102 | — | 50,840 shares | $19,901,318 |
| Openlane, Inc. | COM | 48238T109 | — | 480,580 shares | $19,819,119 |
| Q2 Holdings, Inc. | COM | 74736L109 | — | 410,409 shares | $19,740,673 |
| Box, Inc. | COM | 10316T104 | — | 743,000 shares | $19,719,220 |
| VSE Corp. | COM | 918284100 | — | 86,098 shares | $19,673,393 |
| Benchmark Electronics Inc | COM | 08160H101 | — | 198,300 shares | $19,566,261 |
| New York Times Co. Cl A | COM | 650111107 | — | 277,050 shares | $19,387,959 |
| Advanced Energy Industry, Inc. | COM | 007973100 | — | 49,423 shares | $18,428,354 |
| Eton Pharmaceuticals, Inc. | COM | 29772L108 | — | 501,600 shares | $18,157,920 |
| AxoGen Inc. | COM | 05463X106 | — | 388,194 shares | $17,930,681 |
| Fabrinet | COM | G3323L100 | — | 30,373 shares | $17,072,056 |