Oberweis Asset Management Inc/ Portfolio Stock Holdings
Oberweis Asset Management Inc/ disclosed 180 stock positions valued at approximately $3.4 billion in its latest SEC 13F filing. The largest holdings include Applied Optoelectronics Inc., Lumentum Hldgs, Inc., and Credo Technology Group. The filing reflects positions held as of March 31, 2026 and was filed on May 15, 2026.
- Report Period
- March 31, 2026
- No. of Stocks
- 180
- Portfolio Value
- $3.4B
Holdings by Sector
Oberweis Asset Management Inc/ Portfolio Holdings in Q1 2026
166 holdings in the latest reporting period.
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| Company | Symbol | Sector | Portfolio % | Shares | Change (Shares) | Change % | Value |
|---|---|---|---|---|---|---|---|
| Applied Optoelectronics Inc. | AAOI | Technology | 5.87% | 2,349,969 | +310,328 | +15.21% | $198,783,878 |
| Lumentum Hldgs, Inc. | LITE | Technology | 5.53% | 266,222 | -14,708 | -5.24% | $187,090,173 |
| Credo Technology Group | G25457105 | Other | 2.83% | 1,021,968 | +346,580 | +51.32% | $95,932,136 |
| DigitalOcean Holdings, Inc. | DOCN | Technology | 2.35% | 927,505 | +148,675 | +19.09% | $79,561,379 |
| SharkNinja, Inc. | SN | Other | 1.88% | 599,970 | +73,660 | +14.00% | $63,536,823 |
| Dana Inc. | DAN | Consumer Cyclical | 1.60% | 1,611,500 | +815,000 | +102.32% | $54,226,975 |
| BrightSpring Health Services | BTSG | Healthcare | 1.46% | 1,158,970 | +250,970 | +27.64% | $49,383,712 |
| Macom Technology Solutions | MTSI | Technology | 1.42% | 215,886 | +36,926 | +20.63% | $47,941,804 |
| Rambus, Inc | RMBS | Technology | 1.34% | 526,316 | +64,216 | +13.90% | $45,278,965 |
| Clean Harbors, Inc. | CLH | Industrials | 1.22% | 144,355 | +27,485 | +23.52% | $41,390,909 |
| SiTime Corporation | SITM | Technology | 1.22% | 119,281 | +12,885 | +12.11% | $41,193,693 |
| Ultra Clean Holdings | UCTT | Technology | 1.18% | 640,476 | +11,976 | +1.91% | $39,824,798 |
| Frontdoor, Inc. | FTDR | Consumer Cyclical | 1.12% | 717,960 | +107,100 | +17.53% | $37,951,366 |
| Carpenter Technology Corp. | CRS | Industrials | 1.10% | 94,433 | +11,822 | +14.31% | $37,220,897 |
| Skywest Inc | SKYW | Industrials | 1.06% | 392,499 | +10,279 | +2.69% | $36,043,183 |
| Lattice Semiconductor Corporat | LSCC | Technology | 1.03% | 374,436 | +59,800 | +19.01% | $34,732,683 |
| Globus Medical, Inc.-A | GMED | Healthcare | 1.00% | 392,200 | +122,200 | +45.26% | $33,791,952 |
| Arcutis Biotherapeutics, Inc. | ARQT | Healthcare | 0.95% | 1,365,941 | +557,541 | +68.97% | $32,181,570 |
| Flowserve Corporation | FLS | Industrials | 0.94% | 434,681 | +24,740 | +6.04% | $31,953,415 |
| Silicon Motion Techn ADR | SIMO | Technology | 0.94% | 282,550 | +46,250 | +19.57% | $31,727,540 |
| Life Time Holdings, Inc. | LTH | Consumer Cyclical | 0.92% | 1,160,500 | +101,200 | +9.55% | $31,263,870 |
| Rush Street Interactive, Inc. | RSI | Consumer Cyclical | 0.92% | 1,434,560 | +22,850 | +1.62% | $31,201,680 |
| FirstCash Holdings, Inc | FCFS | Financial Services | 0.92% | 165,665 | +34,365 | +26.17% | $31,145,020 |
| Fastly, Inc. | FSLY | Technology | 0.92% | 1,071,022 | +381,222 | +55.27% | $31,123,899 |
| Tutor Perini Corp. | TPC | Industrials | 0.90% | 393,900 | +6,700 | +1.73% | $30,405,141 |
| Dutch Bros., Inc. | BROS | Consumer Cyclical | 0.90% | 598,493 | +193,993 | +47.96% | $30,319,655 |
| Solaris Energy Infrastructur | SOI | Other | 0.89% | 531,889 | +164,989 | +44.97% | $30,057,047 |
| Merit Medical System Inc | MMSI | Healthcare | 0.86% | 424,209 | +155,449 | +57.84% | $29,240,726 |
| Federal Signal Corp. | FSS | Industrials | 0.85% | 267,634 | +101,134 | +60.74% | $28,941,941 |
| American Superconductor | AMSC | Industrials | 0.85% | 849,900 | +14,000 | +1.67% | $28,769,115 |
| Mercury Systems, Inc. | MRCY | Industrials | 0.84% | 391,023 | -23,017 | -5.56% | $28,509,487 |
| Arcosa, Inc. | ACA | Industrials | 0.84% | 267,700 | +46,100 | +20.80% | $28,413,678 |
| Osi Systems, Inc. | OSIS | Technology | 0.84% | 106,593 | +5,193 | +5.12% | $28,301,507 |
| Core Natural Resources, Inc. | CEIX | Other | 0.83% | 269,800 | +91,400 | +51.23% | $28,256,154 |
| Waystar Holding Corp. | WAY | Healthcare | 0.83% | 1,167,474 | +326,874 | +38.89% | $28,147,798 |
| Encompass Health Corporation | EHC | Healthcare | 0.83% | 289,485 | -69,486 | -19.36% | $28,001,892 |
| Veracyte, Inc. | VCYT | Healthcare | 0.80% | 839,834 | +113,094 | +15.56% | $27,051,053 |
| AAR Corp. | AIR | Industrials | 0.79% | 245,125 | -27,575 | -10.11% | $26,831,383 |
| ICU Medical, Inc. | ICUI | Healthcare | 0.78% | 203,710 | +35,670 | +21.23% | $26,309,147 |
| Littelfuse, Inc. | LFUS | Technology | 0.72% | 71,800 | +9,500 | +15.25% | $24,365,330 |
| Primoris Services Corp. | PRIM | Industrials | 0.70% | 166,100 | +2,800 | +1.71% | $23,758,944 |
| Remitly Global, Inc. | RELY | Technology | 0.67% | 1,454,300 | +451,500 | +45.02% | $22,788,881 |
| Genpact Ltd. | G | Other | 0.67% | 606,832 | +85,230 | +16.34% | $22,604,496 |
| Assurant, Inc. | AIZ | Financial Services | 0.66% | 102,300 | +19,300 | +23.25% | $22,281,963 |
| Blue Bird Corporation | BLBD | Industrials | 0.65% | 389,238 | +6,600 | +1.72% | $22,104,826 |
| Imax Corp. | IMAX | Communication Services | 0.65% | 577,139 | -75,161 | -11.52% | $21,937,053 |
| Levi Strauss & Co. | LEVI | Consumer Cyclical | 0.64% | 1,167,300 | +173,400 | +17.45% | $21,583,377 |
| Alphatec Hldgs Inc. | ATEC | Healthcare | 0.61% | 1,908,293 | +907,893 | +90.75% | $20,762,228 |
| nLIGHT Inc. | LASR | Technology | 0.61% | 363,010 | +6,610 | +1.85% | $20,698,830 |
| National Vision Holdings, Inc. | EYE | Consumer Cyclical | 0.61% | 797,780 | +13,280 | +1.69% | $20,662,502 |
| Ameris Bancorp | ABCB | Financial Services | 0.61% | 263,500 | +107,100 | +68.48% | $20,550,365 |
| LivaNova Plc | LIVN | Other | 0.60% | 321,900 | +109,600 | +51.63% | $20,459,964 |
| Leonardo DRS, Inc. | DRS | Industrials | 0.59% | 449,500 | +449,500 | +100.00% | $20,011,740 |
| Urban Outfitters, Inc. | URBN | Consumer Cyclical | 0.59% | 314,792 | +28,392 | +9.91% | $19,942,073 |
| Grand Canyon Education, Inc. | LOPE | Consumer Defensive | 0.59% | 116,900 | +17,100 | +17.13% | $19,876,507 |
| Vistance Networks, Inc. | COMM | Technology | 0.59% | 1,092,012 | +131,100 | +13.64% | $19,874,618 |
| Matador Resources Company | MTDR | Energy | 0.58% | 312,700 | +58,800 | +23.16% | $19,756,386 |
| Viavi Solutions, Inc. | VIAV | Technology | 0.58% | 593,200 | +85,100 | +16.75% | $19,741,696 |
| Chime Financial Inc. | CHYM | Other | 0.57% | 1,035,530 | +1,035,530 | +100.00% | $19,395,477 |
| Pegasystems Inc. | PEGA | Technology | 0.57% | 455,290 | +30,450 | +7.17% | $19,377,157 |
| Catalyst Pharmaceuticals, Inc. | CPRX | Healthcare | 0.57% | 780,570 | +193,600 | +32.98% | $19,326,913 |
| Q2 Holdings, Inc. | QTWO | Technology | 0.55% | 394,629 | +57,769 | +17.15% | $18,665,952 |
| Powell Industries Inc. | POWL | Industrials | 0.55% | 34,157 | -14,543 | -29.86% | $18,481,670 |
| Irhythm Holdings, Inc. | IRTC | Healthcare | 0.54% | 156,004 | +36,304 | +30.33% | $18,411,592 |
| Box, Inc. | BOX | Technology | 0.54% | 771,520 | +119,200 | +18.27% | $18,238,733 |
| Argan, Inc | AGX | Industrials | 0.54% | 33,322 | +351 | +1.06% | $18,148,603 |
| Hinge Health, Inc. | 433313103 | Other | 0.53% | 465,766 | +465,766 | +100.00% | $17,959,937 |
| New York Times Co. Cl A | NYT | Communication Services | 0.52% | 211,650 | -91,050 | -30.08% | $17,721,455 |
| American Eagle Outfitters | AEO | Consumer Cyclical | 0.52% | 1,044,900 | +230,400 | +28.29% | $17,449,830 |
| Alighnment Healthcare, Inc. | ALHC | Healthcare | 0.50% | 966,600 | +219,100 | +29.31% | $17,031,492 |
| ANI Pharmaceuticals, Inc. | ANIP | Healthcare | 0.50% | 221,386 | +32,556 | +17.24% | $17,024,583 |
| Envista Holdings Corp. | NVST | Healthcare | 0.50% | 665,400 | +665,400 | +100.00% | $16,881,198 |
| Genedx Holdings Corp. | WGS | Healthcare | 0.50% | 261,370 | +62,600 | +31.49% | $16,785,181 |
| SPX Technologies, Inc. | SPXC | Industrials | 0.49% | 83,441 | +6,541 | +8.51% | $16,683,194 |
| Shake Shack, Inc. | SHAK | Consumer Cyclical | 0.49% | 187,570 | +187,570 | +100.00% | $16,594,318 |
| Calix, Inc. | CALX | Technology | 0.48% | 335,030 | +90,430 | +36.97% | $16,413,120 |
| EZCorp, Inc. | EZPW | Financial Services | 0.48% | 639,400 | +11,500 | +1.83% | $16,227,972 |
| LeMaitre Vascular, Inc. | LMAT | Healthcare | 0.48% | 148,601 | +32,300 | +27.77% | $16,222,819 |
| Advanced Energy Industry, Inc. | AEIS | Industrials | 0.47% | 49,183 | +9,483 | +23.89% | $15,871,846 |
| Zurn Elkay Water Solutions Cor | ZWS | Industrials | 0.47% | 352,183 | +86,183 | +32.40% | $15,791,886 |
| Fabrinet | FN | Other | 0.47% | 30,263 | +5,063 | +20.09% | $15,782,760 |
| Phibro Animal Health Corp | PAHC | Healthcare | 0.45% | 277,100 | +67,300 | +32.08% | $15,326,401 |
| Diodes, Inc. | DIOD | Technology | 0.45% | 224,300 | +72,400 | +47.66% | $15,310,718 |
| Pediatrix Medical Group, Inc. | MD | Healthcare | 0.44% | 701,087 | +141,100 | +25.20% | $14,996,251 |
| Magnolia Oil & Gas Corp. | MGY | Energy | 0.42% | 454,466 | +78,166 | +20.77% | $14,347,492 |
| Skyward Specialty Ins Group | SKWD | Financial Services | 0.42% | 327,100 | +89,600 | +37.73% | $14,287,728 |
| Halozyme Therapeutics, Inc. | HALO | Healthcare | 0.42% | 219,930 | +102,350 | +87.05% | $14,214,076 |
| Liquidia Corp. | LQDA | Healthcare | 0.41% | 372,100 | +42,900 | +13.03% | $14,043,054 |
| Arlo Technologies, Inc. | ARLO | Industrials | 0.41% | 982,300 | +982,300 | +100.00% | $13,978,129 |
| HealthEquity Inc. | HQY | Healthcare | 0.41% | 166,641 | +25,061 | +17.70% | $13,926,188 |
| ProPetro Holding Corp. | PUMP | Energy | 0.41% | 965,500 | +17,600 | +1.86% | $13,912,855 |
| Zeta Global Holdings Corp. | ZETA | Technology | 0.41% | 871,060 | +104,040 | +13.56% | $13,867,275 |
| Mirion Technologies, Inc. | MIR | Industrials | 0.41% | 744,267 | +136,467 | +22.45% | $13,835,924 |
| Moog Inc. - A | MOG-A | Industrials | 0.39% | 44,910 | +44,910 | +100.00% | $13,142,462 |
| Interdigital, Inc. | IDCC | Technology | 0.38% | 42,645 | +14,345 | +50.69% | $12,878,790 |
| Ducommun Inc. | DCO | Industrials | 0.36% | 99,900 | +1,800 | +1.83% | $12,187,800 |
| Impinj, Inc. | PI | Technology | 0.36% | 118,086 | +10,966 | +10.24% | $12,127,432 |
| A10 Networks, Inc. | ATEN | Technology | 0.34% | 504,300 | +504,300 | +100.00% | $11,659,416 |
| Dave, Inc. | DAVE | Technology | 0.34% | 66,702 | +7,780 | +13.20% | $11,612,151 |
| Seacoast Bkg Corp. | SBCF | Financial Services | 0.34% | 378,866 | +378,866 | +100.00% | $11,475,851 |