# OBERWEIS ASSET MANAGEMENT INC/

> Institutional holdings reported to the SEC as of Q2 2026 on Form 13F. CIK 937886. Source: https://holderbook.com/funds/937886-oberweis-asset-management-inc/

- Reported value: $4.8B
- Positions: 176
- Weight of the ten largest: 26.6%
- Filed: 2026-08-14

A 13F reports long US equity positions only. Short positions, bonds, foreign listings, private holdings and cash are not visible, so this is not the manager's whole book.

## Holdings

| Security | Ticker | Value | Shares | Weight | Quarters held |
|---|---|---|---|---|---|
| CREDO TECHNOLOGY GROUP HOLDI | [CRDO](https://holderbook.com/stocks/CRDO/) | $275.6M | 1,013,428 | 5.7% | 10 |
| APPLIED OPTOELECTRONICS INC | [AAOI](https://holderbook.com/stocks/AAOI/) | $265.4M | 1,791,127 | 5.5% | 12 |
| DIGITALOCEAN HLDGS INC | [DOCN](https://holderbook.com/stocks/DOCN/) | $146.0M | 930,005 | 3.0% | 8 |
| SILICON MOTION TECHNOLOGY CO | [SIMO](https://holderbook.com/stocks/SIMO/) | $105.4M | 316,350 | 2.2% | 11 |
| ULTRA CLEAN HLDGS INC | [UCTT](https://holderbook.com/stocks/UCTT/) | $92.3M | 647,276 | 1.9% | 27 |
| SHARKNINJA INC | [SN](https://holderbook.com/stocks/SN/) | $90.4M | 593,500 | 1.9% | 10 |
| SITIME CORP | [SITM](https://holderbook.com/stocks/SITM/) | $89.1M | 119,501 | 1.8% | 5 |
| BRIGHTSPRING HEALTH SVCS INC | [BTSG](https://holderbook.com/stocks/BTSG/) | $82.7M | 1,185,280 | 1.7% | 5 |
| HINGE HEALTH INC | [HNGE](https://holderbook.com/stocks/HNGE/) | $71.0M | 855,476 | 1.5% | 2 |
| RAMBUS INC DEL | [RMBS](https://holderbook.com/stocks/RMBS/) | $70.0M | 527,016 | 1.4% | 7 |
| MACOM TECH SOLUTIONS HLDGS I | [MTSI](https://holderbook.com/stocks/MTSI/) | $68.2M | 179,356 | 1.4% | 8 |
| LUMENTUM HLDGS INC | [LITE](https://holderbook.com/stocks/LITE/) | $61.9M | 72,185 | 1.3% | 5 |
| LATTICE SEMICONDUCTOR CORP | [LSCC](https://holderbook.com/stocks/LSCC/) | $59.9M | 391,816 | 1.2% | 4 |
| NOVA LTD | [NVMI](https://holderbook.com/stocks/NVMI/) | $59.0M | 108,675 | 1.2% | 8 |
| CARPENTER TECHNOLOGY CORP | [CRS](https://holderbook.com/stocks/CRS/) | $57.5M | 93,273 | 1.2% | 11 |
| FRONTDOOR INC | [FTDR](https://holderbook.com/stocks/FTDR/) | $55.8M | 719,060 | 1.2% | 13 |
| EVERUS CONSTR GROUP | [ECG](https://holderbook.com/stocks/ECG/) | $54.5M | 328,183 | 1.1% | 5 |
| VERACYTE INC | [VCYT](https://holderbook.com/stocks/VCYT/) | $51.5M | 877,734 | 1.1% | 15 |
| POWELL INDS INC | [POWL](https://holderbook.com/stocks/POWL/) | $51.4M | 179,521 | 1.1% | 12 |
| LIFE TIME GROUP HOLDINGS INC | [LTH](https://holderbook.com/stocks/LTH/) | $48.6M | 1,189,620 | 1.0% | 6 |
| RUSH STREET INTERACTIVE INC | [RSI](https://holderbook.com/stocks/RSI/) | $48.4M | 1,627,930 | 1.0% | 10 |
| MERCURY SYS INC | [MRCY](https://holderbook.com/stocks/MRCY/) | $48.0M | 392,723 | 1.0% | 6 |
| DUTCH BROS INC | [BROS](https://holderbook.com/stocks/BROS/) | $47.1M | 656,093 | 1.0% | 9 |
| CLEAN HARBORS INC | [CLH](https://holderbook.com/stocks/CLH/) | $45.9M | 153,475 | 0.9% | 23 |
| SOLARIS ENERGY INFRAS INC | [SEI](https://holderbook.com/stocks/SEI/) | $45.4M | 564,581 | 0.9% | 6 |
| DIODES INC | [DIOD](https://holderbook.com/stocks/DIOD/) | $45.3M | 413,750 | 0.9% | 5 |
| ARCOSA INC | [ACA](https://holderbook.com/stocks/ACA/) | $42.9M | 295,450 | 0.9% | 7 |
| BLUE BIRD CORP | [BLBD](https://holderbook.com/stocks/BLBD/) | $41.8M | 529,838 | 0.9% | 14 |
| CAMTEK LTD | [CAMT](https://holderbook.com/stocks/CAMT/) | $41.3M | 253,380 | 0.9% | 31 |
| LIVANOVA PLC | [LIVN](https://holderbook.com/stocks/LIVN/) | $41.1M | 500,150 | 0.8% | 4 |
| AMERICAN SUPERCONDUCTOR CORP | [AMSC](https://holderbook.com/stocks/AMSC/) | $41.0M | 987,500 | 0.8% | 11 |
| MAXLINEAR INC | [MXL](https://holderbook.com/stocks/MXL/) | $40.9M | 319,500 | 0.8% | 1 |
| GLOBUS MED INC | [GMED](https://holderbook.com/stocks/GMED/) | $40.5M | 512,100 | 0.8% | 3 |
| NOVANTA INC | [NOVT](https://holderbook.com/stocks/NOVT/) | $39.6M | 244,260 | 0.8% | 1 |
| SKYWEST INC | [SKYW](https://holderbook.com/stocks/SKYW/) | $38.1M | 383,799 | 0.8% | 11 |
| VIAVI SOLUTIONS INC | [VIAV](https://holderbook.com/stocks/VIAV/) | $37.9M | 793,600 | 0.8% | 3 |
| MOOG INC | [MOGA](https://holderbook.com/stocks/MOGA/) | $36.8M | 86,735 | 0.8% | 2 |
| LITTELFUSE INC | [LFUS](https://holderbook.com/stocks/LFUS/) | $36.3M | 79,800 | 0.8% | 4 |
| ARCUTIS BIOTHERAPEUTICS INC | [ARQT](https://holderbook.com/stocks/ARQT/) | $36.0M | 1,372,941 | 0.7% | 3 |
| FIRSTCASH HOLDINGS INC | [FCFS](https://holderbook.com/stocks/FCFS/) | $35.9M | 166,105 | 0.7% | 17 |
| BILLIONTOONE INC | [BLLN](https://holderbook.com/stocks/BLLN/) | $35.9M | 299,030 | 0.7% | 1 |
| DANA INC | [DAN](https://holderbook.com/stocks/DAN/) | $35.9M | 1,318,300 | 0.7% | 3 |
| ELEMENT SOLUTIONS INC | [ESI](https://holderbook.com/stocks/ESI/) | $35.3M | 740,100 | 0.7% | 1 |
| AAR CORP | [AIR](https://holderbook.com/stocks/AIR/) | $35.2M | 246,325 | 0.7% | 6 |
| REMITLY GLOBAL INC | [RELY](https://holderbook.com/stocks/RELY/) | $35.2M | 1,570,400 | 0.7% | 5 |
| ICU MED INC | [ICUI](https://holderbook.com/stocks/ICUI/) | $34.8M | 237,050 | 0.7% | 8 |
| FEDERAL SIGNAL CORP | [FSS](https://holderbook.com/stocks/FSS/) | $34.6M | 269,084 | 0.7% | 16 |
| OUSTER INC | [OUST](https://holderbook.com/stocks/OUST/) | $34.1M | 545,810 | 0.7% | 1 |
| LEVI STRAUSS & CO NEW | [LEVI](https://holderbook.com/stocks/LEVI/) | $33.7M | 1,358,100 | 0.7% | 4 |
| MERIT MED SYS INC | [MMSI](https://holderbook.com/stocks/MMSI/) | $32.8M | 473,409 | 0.7% | 19 |
| ASSURANT INC | [AIZ](https://holderbook.com/stocks/AIZ/) | $32.8M | 122,100 | 0.7% | 11 |
| WAYSTAR HLDG CORP | [WAY](https://holderbook.com/stocks/WAY/) | $32.6M | 1,589,364 | 0.7% | 7 |
| CECO ENVIRONMENTAL CORP | [CECO](https://holderbook.com/stocks/CECO/) | $32.5M | 358,072 | 0.7% | 4 |
| LIQUIDIA CORPORATION | [LQDA](https://holderbook.com/stocks/LQDA/) | $32.4M | 406,400 | 0.7% | 10 |
| ENCOMPASS HEALTH CORP | [EHC](https://holderbook.com/stocks/EHC/) | $32.0M | 316,886 | 0.7% | 13 |
| INDIVIOR PHARMACEUTICALS INC | [INDV](https://holderbook.com/stocks/INDV/) | $32.0M | 779,188 | 0.7% | 2 |
| COGNEX CORP | [CGNX](https://holderbook.com/stocks/CGNX/) | $31.0M | 427,820 | 0.6% | 1 |
| GRANITE CONSTR INC | [GVA](https://holderbook.com/stocks/GVA/) | $30.5M | 193,090 | 0.6% | 1 |
| PDF SOLUTIONS INC | [PDFS](https://holderbook.com/stocks/PDFS/) | $30.2M | 426,400 | 0.6% | 1 |
| ENVISTA HOLDINGS CORPORATION | [NVST](https://holderbook.com/stocks/NVST/) | $29.5M | 1,120,782 | 0.6% | 2 |
| DAVE INC | [DAVE](https://holderbook.com/stocks/DAVE/) | $29.4M | 78,902 | 0.6% | 5 |
| AMBARELLA INC | [AMBA](https://holderbook.com/stocks/AMBA/) | $29.4M | 342,254 | 0.6% | 8 |
| NLIGHT INC | [LASR](https://holderbook.com/stocks/LASR/) | $28.8M | 413,310 | 0.6% | 4 |
| MYR GROUP INC | [MYRG](https://holderbook.com/stocks/MYRG/) | $27.1M | 54,190 | 0.6% | 1 |
| ADAPTIVE BIOTECHNOLOGIES COR | [ADPT](https://holderbook.com/stocks/ADPT/) | $27.0M | 1,258,751 | 0.6% | 5 |
| LEONARDO DRS INC | [DRS](https://holderbook.com/stocks/DRS/) | $26.8M | 628,486 | 0.6% | 2 |
| TUTOR PERINI CORP | [TPC](https://holderbook.com/stocks/TPC/) | $26.8M | 323,200 | 0.6% | 6 |
| KODIAK GAS SVCS INC | [KGS](https://holderbook.com/stocks/KGS/) | $26.7M | 355,870 | 0.6% | 1 |
| KINIKSA PHARMACEUTICALS INTL | [KNSA](https://holderbook.com/stocks/KNSA/) | $26.4M | 413,034 | 0.5% | 8 |
| CHIME FINL INC | [CHYM](https://holderbook.com/stocks/CHYM/) | $26.0M | 1,268,330 | 0.5% | 2 |
| ALIGNMENT HEALTHCARE INC | [ALHC](https://holderbook.com/stocks/ALHC/) | $25.9M | 1,089,600 | 0.5% | 3 |
| HALOZYME THERAPEUTICS INC | [HALO](https://holderbook.com/stocks/HALO/) | $25.1M | 321,030 | 0.5% | 5 |
| IRHYTHM HOLDINGS INC | [IRTC](https://holderbook.com/stocks/IRTC/) | $24.0M | 202,004 | 0.5% | 5 |
| AMERIS BANCORP | [ABCB](https://holderbook.com/stocks/ABCB/) | $23.9M | 264,600 | 0.5% | 8 |
| ZURN ELKAY WATER SOLNS CORP | [ZWS](https://holderbook.com/stocks/ZWS/) | $23.7M | 468,453 | 0.5% | 4 |
| OSI SYSTEMS INC | [OSIS](https://holderbook.com/stocks/OSIS/) | $23.4M | 107,143 | 0.5% | 12 |
| OMADA HEALTH INC | [OMDA](https://holderbook.com/stocks/OMDA/) | $23.0M | 1,048,800 | 0.5% | 1 |
| URBAN OUTFITTERS INC | [URBN](https://holderbook.com/stocks/URBN/) | $22.4M | 316,192 | 0.5% | 5 |
| ANI PHARMACEUTICALS INC | [ANIP](https://holderbook.com/stocks/ANIP/) | $22.0M | 265,306 | 0.5% | 12 |
| EZCORP INC | [EZPW](https://holderbook.com/stocks/EZPW/) | $21.8M | 631,800 | 0.5% | 17 |
| CORE NATURAL RESOURCES INC | [CNR](https://holderbook.com/stocks/CNR/) | $21.7M | 271,170 | 0.4% | 3 |
| DUCOMMUN INC DEL | [DCO](https://holderbook.com/stocks/DCO/) | $21.1M | 113,800 | 0.4% | 7 |
| SKYWARD SPECIALTY INS GROUP | [SKWD](https://holderbook.com/stocks/SKWD/) | $21.0M | 359,100 | 0.4% | 11 |
| WILLDAN GROUP INC | [WLDN](https://holderbook.com/stocks/WLDN/) | $20.8M | 262,700 | 0.4% | 1 |
| A10 NETWORKS INC | [ATEN](https://holderbook.com/stocks/ATEN/) | $20.6M | 552,000 | 0.4% | 2 |
| HEALTHEQUITY INC | [HQY](https://holderbook.com/stocks/HQY/) | $20.6M | 228,291 | 0.4% | 11 |
| SUPER GROUP SGHC LIMITED | [SGHC](https://holderbook.com/stocks/SGHC/) | $20.6M | 1,521,000 | 0.4% | 3 |
| SPX TECHNOLOGIES INC | [SPXC](https://holderbook.com/stocks/SPXC/) | $20.5M | 83,811 | 0.4% | 13 |
| FORMFACTOR INC | [FORM](https://holderbook.com/stocks/FORM/) | $20.4M | 127,330 | 0.4% | 1 |
| WATTS WATER TECHNOLOGIES INC | [WTS](https://holderbook.com/stocks/WTS/) | $19.9M | 50,840 | 0.4% | 1 |
| OPENLANE INC | [OPLN](https://holderbook.com/stocks/OPLN/) | $19.8M | 480,580 | 0.4% | 1 |
| Q2 HLDGS INC | [QTWO](https://holderbook.com/stocks/QTWO/) | $19.7M | 410,409 | 0.4% | 9 |
| BOX INC | [BOX](https://holderbook.com/stocks/BOX/) | $19.7M | 743,000 | 0.4% | 8 |
| VSE CORP | [VSEC](https://holderbook.com/stocks/VSEC/) | $19.7M | 86,098 | 0.4% | 17 |
| BENCHMARK ELECTRS INC | [BHE](https://holderbook.com/stocks/BHE/) | $19.6M | 198,300 | 0.4% | 3 |
| NEW YORK TIMES CO MTN BE | [NYT](https://holderbook.com/stocks/NYT/) | $19.4M | 277,050 | 0.4% | 4 |
| ADVANCED ENERGY INDS | [AEIS](https://holderbook.com/stocks/AEIS/) | $18.4M | 49,423 | 0.4% | 5 |
| ETON PHARMACEUTICALS INC | [ETON](https://holderbook.com/stocks/ETON/) | $18.2M | 501,600 | 0.4% | 4 |
| AXOGEN INC | [AXGN](https://holderbook.com/stocks/AXGN/) | $17.9M | 388,194 | 0.4% | 8 |
| FABRINET | [FN](https://holderbook.com/stocks/FN/) | $17.1M | 30,373 | 0.4% | 12 |

## What the disclosed book did

Not the fund's return. This is the change in value of the positions disclosed on Form 13F, had they been left untouched, against SPY over the same quarter ends.

| Quarter | Book | Market | Difference | Priced |
|---|---|---|---|---|
| Q2 2026 | +34.4% | +14.8% | +19.6% | 100% |
| Q1 2026 | +7.8% | -4.6% | +12.4% | 99% |
| Q4 2025 | +2.1% | +2.4% | -0.3% | 100% |
| Q3 2025 | +11.1% | +7.8% | +3.3% | 100% |
| Q2 2025 | +15.6% | +10.5% | +5.2% | 99% |
| Q1 2025 | -11.5% | -4.6% | -6.9% | 100% |
| Q4 2024 | -1.1% | +2.1% | -3.3% | 99% |
| Q3 2024 | +5.6% | +5.4% | +0.2% | 100% |

## Quarter by quarter

| Quarter | Value | Positions |
|---|---|---|
| Q2 2026 | $4.8B | 176 |
| Q1 2026 | $3.4B | 179 |
| Q4 2025 | $2.7B | 178 |
| Q3 2025 | $2.6B | 182 |
| Q2 2025 | $2.3B | 184 |
| Q1 2025 | $2.0B | 191 |
| Q4 2024 | $2.1B | 195 |
| Q3 2024 | $2.0B | 205 |
| Q2 2024 | $1.6B | 195 |
| Q1 2024 | $1.4B | 194 |
| Q4 2023 | $1.1B | 190 |
| Q3 2023 | $941.5M | 191 |