13F-HR filed by OBERWEIS ASSET MANAGEMENT INC/
OBERWEIS ASSET MANAGEMENT INC/ filed this 13F-HR for the quarter ended 2026-03-31, filed 2026-05-15, with 180 holding rows worth $3,385,664,734.
- Accession
- 0001213900-26-057307
- Filer
- CIK 937886
- Filed
- 2026-05-15
- Accepted by EDGAR
- acceptance time not in the bulk data set
- Ingested
- Source
- SEC quarterly data set
13F report for Q1 2026
A holdings report, 180 entries on the cover page, a total value of $3,385,664,734 stated on the cover page (in dollars after the unit check, H1), rows summing to $3,385,664,734 with VALUE read as dollars as filed, 13F file number 028-04688. The quarter's positions are built on this report. The resolved quarter.
The information table after summing rows of one CUSIP and put or call (H4), with the CUSIP and issuer name as filed. Values in dollars after the unit check (method).
| Issuer as filed | CUSIP | Class | Amount | Value | Value read as | Type |
|---|---|---|---|---|---|---|
| APPLIED OPTOELECTRONICS INC | 03823U102 | COM | 2,349,969 | $198,783,878 | dollars as filed | |
| LUMENTUM HLDGS INC COM | 55024U109 | Stock | 266,222 | $187,090,173 | dollars as filed | |
| CREDO TECHNOLOGY GROUP HOLDING ORDINARY SHARES | G25457105 | Stock | 1,021,968 | $95,932,136 | dollars as filed | |
| DIGITALOCEAN HLDGS INC COM | 25402D102 | Stock | 927,505 | $79,561,379 | dollars as filed | |
| SHARKNINJA INC COM SHS | G8068L108 | Stock | 599,970 | $63,536,823 | dollars as filed | |
| NOVA LTD COM | M7516K103 | Stock | 137,955 | $59,911,097 | dollars as filed | |
| DANA INC | 235825205 | COM | 1,611,500 | $54,226,975 | dollars as filed | |
| BRIGHTSPRING HEALTH SVCS | 10950A106 | COM | 1,158,970 | $49,383,712 | dollars as filed | |
| MACOM TECH SOLUTIONS HLDGS INC COM | 55405Y100 | Stock | 215,886 | $47,941,804 | dollars as filed | |
| RAMBUS INC DEL COM | 750917106 | Stock | 526,316 | $45,278,965 | dollars as filed | |
| CLEAN HARBORS INC COM | 184496107 | Stock | 144,355 | $41,390,909 | dollars as filed | |
| SITIME CORP COM | 82982T106 | Stock | 119,281 | $41,193,693 | dollars as filed | |
| ULTRA CLEAN HLDGS INC COM | 90385V107 | Stock | 640,476 | $39,824,798 | dollars as filed | |
| EVERUS CONSTR GROUP COM | 300426103 | Stock | 326,533 | $38,550,486 | dollars as filed | |
| FRONTDOOR INC COM | 35905A109 | Stock | 717,960 | $37,951,366 | dollars as filed | |
| CARPENTER TECHNOLOGY CORP | 144285103 | COM | 94,433 | $37,220,897 | dollars as filed | |
| SKYWEST INC COM | 830879102 | Stock | 392,499 | $36,043,183 | dollars as filed | |
| LATTICE SEMICONDUCTOR CORP COM | 518415104 | Stock | 374,436 | $34,732,683 | dollars as filed | |
| GLOBUS MED INC CL A | 379577208 | Stock | 392,200 | $33,791,952 | dollars as filed | |
| CAMTEK LTD ORD | M20791105 | Stock | 222,780 | $33,775,676 | dollars as filed | |
| ARCUTIS BIOTHERAPEUTICS INC | 03969K108 | COM | 1,365,941 | $32,181,570 | dollars as filed | |
| FLOWSERVE CORP | 34354P105 | COM | 434,681 | $31,953,415 | dollars as filed | |
| SILICON MOTION TECHNOLOGY CORP SPONSORED ADR | 82706C108 | ADR | 282,550 | $31,727,540 | dollars as filed | |
| LIFE TIME GROUP HOLDINGS INC COMMON STOCK | 53190C102 | Stock | 1,160,500 | $31,263,870 | dollars as filed | |
| RUSH STREET INTERACTIVE INC | 782011100 | COM | 1,434,560 | $31,201,680 | dollars as filed | |
| FIRSTCASH HOLDINGS INC | 33768G107 | COM | 165,665 | $31,145,020 | dollars as filed | |
| FASTLY INC | 31188V100 | CL A | 1,071,022 | $31,123,899 | dollars as filed | |
| TUTOR PERINI CORP | 901109108 | COM | 393,900 | $30,405,141 | dollars as filed | |
| DUTCH BROS INC | 26701L100 | CL A | 598,493 | $30,319,655 | dollars as filed | |
| SOLARIS ENERGY INFRAS INC COM CL A | 83418M103 | Stock | 531,889 | $30,057,047 | dollars as filed | |
| MERIT MED SYS INC COM | 589889104 | Stock | 424,209 | $29,240,726 | dollars as filed | |
| FEDERAL SIGNAL CORP | 313855108 | COM | 267,634 | $28,941,941 | dollars as filed | |
| AMERICAN SUPERCONDUCTOR CORP | 030111207 | SHS NEW | 849,900 | $28,769,115 | dollars as filed | |
| MERCURY SYS INC COM | 589378108 | Stock | 391,023 | $28,509,487 | dollars as filed | |
| ARCOSA INC COM | 039653100 | Stock | 267,700 | $28,413,678 | dollars as filed | |
| OSI SYSTEMS INC | 671044105 | COM | 106,593 | $28,301,507 | dollars as filed | |
| CORE NATURAL RESOURCES INC | 218937100 | COM SHS | 269,800 | $28,256,154 | dollars as filed | |
| WAYSTAR HLDG CORP | 946784105 | COM | 1,167,474 | $28,147,798 | dollars as filed | |
| ENCOMPASS HEALTH CORP COM | 29261A100 | Stock | 289,485 | $28,001,892 | dollars as filed | |
| VERACYTE INC COM | 92337F107 | Stock | 839,834 | $27,051,053 | dollars as filed | |
| AAR CORP | 000361105 | COM | 245,125 | $26,831,383 | dollars as filed | |
| ICU MED INC | 44930G107 | COM | 203,710 | $26,309,147 | dollars as filed | |
| LITTELFUSE INC COM | 537008104 | Stock | 71,800 | $24,365,330 | dollars as filed | |
| PRIMORIS SVCS CORP COM | 74164F103 | Stock | 166,100 | $23,758,944 | dollars as filed | |
| REMITLY GLOBAL INC | 75960P104 | COM | 1,454,300 | $22,788,881 | dollars as filed | |
| GENPACT LIMITED SHS | G3922B107 | Stock | 606,832 | $22,604,496 | dollars as filed | |
| ASSURANT INC COM | 04621X108 | Stock | 102,300 | $22,281,963 | dollars as filed | |
| BLUE BIRD CORP | 095306106 | COM | 389,238 | $22,104,826 | dollars as filed | |
| IMAX CORP | 45245E109 | COM | 577,139 | $21,937,053 | dollars as filed | |
| LEVI STRAUSS & CO NEW CL A COM STK | 52736R102 | Stock | 1,167,300 | $21,583,377 | dollars as filed | |
| ALPHATEC HLDGS INC | 02081G201 | COM NEW | 1,908,293 | $20,762,228 | dollars as filed | |
| NLIGHT INC | 65487K100 | COM | 363,010 | $20,698,830 | dollars as filed | |
| NATIONAL VISION HLDGS INC COM | 63845R107 | Stock | 797,780 | $20,662,502 | dollars as filed | |
| AMERIS BANCORP | 03076K108 | COM | 263,500 | $20,550,365 | dollars as filed | |
| LIVANOVA PLC | G5509L101 | SHS | 321,900 | $20,459,964 | dollars as filed | |
| LEONARDO DRS INC COM | 52661A108 | Stock | 449,500 | $20,011,740 | dollars as filed | |
| URBAN OUTFITTERS INC | 917047102 | COM | 314,792 | $19,942,073 | dollars as filed | |
| INDIVIOR PHARMACEUTICALS INC | 45579U109 | COM | 653,413 | $19,916,028 | dollars as filed | |
| GRAND CANYON ED INC COM | 38526M106 | Stock | 116,900 | $19,876,507 | dollars as filed | |
| COMMSCOPE HLDG CO INC | 20337X109 | COM | 1,092,012 | $19,874,618 | dollars as filed | |
| MATADOR RES CO COM | 576485205 | Stock | 312,700 | $19,756,386 | dollars as filed | |
| VIAVI SOLUTIONS INC | 925550105 | COM | 593,200 | $19,741,696 | dollars as filed | |
| CHIME FINL INC COM SHS CL A | 16935C109 | Stock | 1,035,530 | $19,395,477 | dollars as filed | |
| PEGASYSTEMS INC COM | 705573103 | Stock | 455,290 | $19,377,157 | dollars as filed | |
| CATALYST PHARMACEUTICALS INC | 14888U101 | COM | 780,570 | $19,326,913 | dollars as filed | |
| Q2 HLDGS INC COM | 74736L109 | Stock | 394,629 | $18,665,952 | dollars as filed | |
| POWELL INDS INC | 739128106 | COM | 34,157 | $18,481,670 | dollars as filed | |
| IRHYTHM HOLDINGS INC COM | 450056106 | Stock | 156,004 | $18,411,592 | dollars as filed | |
| BOX INC CL A | 10316T104 | Stock | 771,520 | $18,238,733 | dollars as filed | |
| ARGAN INC | 04010E109 | COM | 33,322 | $18,148,603 | dollars as filed | |
| HINGE HEALTH INC A | 433313103 | COMMON STOCK | 465,766 | $17,959,937 | dollars as filed | |
| NEW YORK TIMES CO MTN BE CL A | 650111107 | Stock | 211,650 | $17,721,455 | dollars as filed | |
| AMERICAN EAGLE OUTFITTERS INC COM | 02553E106 | Stock | 1,044,900 | $17,449,830 | dollars as filed | |
| ALIGNMENT HEALTHCARE INC COM | 01625V104 | Stock | 966,600 | $17,031,492 | dollars as filed | |
| ANI PHARMACEUTICALS INC | 00182C103 | COM | 221,386 | $17,024,583 | dollars as filed | |
| ENVISTA HOLDINGS CORPORATION | 29415F104 | COM | 665,400 | $16,881,198 | dollars as filed | |
| GENEDX HOLDINGS CORP | 81663L200 | COM CL A | 261,370 | $16,785,181 | dollars as filed | |
| SPX TECHNOLOGIES INC | 78473E103 | COM | 83,441 | $16,683,194 | dollars as filed | |
| SHAKE SHACK INC | 819047101 | CL A | 187,570 | $16,594,318 | dollars as filed | |
| CALIX INC | 13100M509 | COM | 335,030 | $16,413,120 | dollars as filed | |
| SUPER GROUP SGHC LIMITED | G8588X103 | ORD SHS | 1,514,400 | $16,355,520 | dollars as filed | |
| EZCORP INC | 302301106 | CL A NON VTG | 639,400 | $16,227,972 | dollars as filed | |
| LEMAITRE VASCULAR INC | 525558201 | COM | 148,601 | $16,222,819 | dollars as filed | |
| ADVANCED ENERGY INDS COM | 007973100 | Stock | 49,183 | $15,871,846 | dollars as filed | |
| ZURN ELKAY WATER SOLNS CORP COM | 98983L108 | Stock | 352,183 | $15,791,886 | dollars as filed | |
| FABRINET SHS | G3323L100 | Stock | 30,263 | $15,782,760 | dollars as filed | |
| KINIKSA PHARMACEUTICALS INTL P ORD SHS CL A | G52694109 | Stock | 318,634 | $15,342,227 | dollars as filed | |
| PHIBRO ANIMAL HEALTH CORP (CLA | 71742Q106 | CL A COM | 277,100 | $15,326,401 | dollars as filed | |
| DIODES INC COM | 254543101 | Stock | 224,300 | $15,310,718 | dollars as filed | |
| AMBARELLA INC | G037AX101 | SHS | 295,185 | $15,194,648 | dollars as filed | |
| PEDIATRIX MEDICAL GROUP INC | 58502B106 | COM | 701,087 | $14,996,251 | dollars as filed | |
| MAGNOLIA OIL & GAS CORP | 559663109 | CL A | 454,466 | $14,347,492 | dollars as filed | |
| SKYWARD SPECIALTY INS GROUP | 830940102 | COM | 327,100 | $14,287,728 | dollars as filed | |
| HALOZYME THERAPEUTICS INC COM | 40637H109 | Stock | 219,930 | $14,214,076 | dollars as filed | |
| LIQUIDIA CORPORATION COM NEW | 53635D202 | Stock | 372,100 | $14,043,054 | dollars as filed | |
| ARLO TECHNOLOGIES INC | 04206A101 | COMMON STOCK | 982,300 | $13,978,129 | dollars as filed | |
| HEALTHEQUITY INC COM | 42226A107 | Stock | 166,641 | $13,926,188 | dollars as filed | |
| PROPETRO HLDG CORP | 74347M108 | COM | 965,500 | $13,912,855 | dollars as filed | |
| ZETA GLOBAL HOLDINGS CORP CL A | 98956A105 | Stock | 871,060 | $13,867,275 | dollars as filed | |
| MIRION TECHNOLOGIES INC | 60471A101 | COM CL A | 744,267 | $13,835,924 | dollars as filed | |
| MOOG INC CL A | 615394202 | Stock | 44,910 | $13,142,462 | dollars as filed | |
| INTERDIGITAL INC COM | 45867G101 | Stock | 42,645 | $12,878,790 | dollars as filed | |
| DUCOMMUN INC DEL | 264147109 | COM | 99,900 | $12,187,800 | dollars as filed | |
| IMPINJ INC | 453204109 | COM | 118,086 | $12,127,432 | dollars as filed | |
| A10 NETWORKS INC | 002121101 | COM | 504,300 | $11,659,416 | dollars as filed | |
| DAVE INC | 23834J201 | CLASS A COM NEW | 66,702 | $11,612,151 | dollars as filed | |
| SEACOAST BKG CORP FLA | 811707801 | COM NEW | 378,866 | $11,475,851 | dollars as filed | |
| AXOGEN INC | 05463X106 | COM | 342,394 | $11,343,513 | dollars as filed | |
| BENCHMARK ELECTRS INC COM | 08160H101 | Stock | 201,900 | $11,318,514 | dollars as filed | |
| ADAPTIVE BIOTECHNOLOGIES CORP COM | 00650F109 | Stock | 806,951 | $11,200,480 | dollars as filed | |
| ONESPAWORLD HOLDINGS LIMITED | P73684113 | COM | 485,690 | $11,146,586 | dollars as filed | |
| NICOLET BANKSHARES INC | 65406E102 | COM | 74,800 | $11,116,776 | dollars as filed | |
| PRECISION DRILLING CORP COM NEW | 74022D407 | Stock | 112,600 | $11,079,840 | dollars as filed | |
| INTERFACE INC | 458665304 | COM | 443,900 | $11,061,988 | dollars as filed | |
| ETON PHARMACEUTICALS INC | 29772L108 | COMMON STOCK | 439,300 | $10,841,924 | dollars as filed | |
| QUALYS INC COM | 74758T303 | Stock | 118,900 | $10,445,365 | dollars as filed | |
| EPLUS INC | 294268107 | COM | 137,498 | $10,346,725 | dollars as filed | |
| EVOLV TECHNOLOGIES HLDNGS IN | 30049H102 | COM CL A | 1,671,949 | $10,115,291 | dollars as filed | |
| BOOT BARN HLDGS INC | 099406100 | COM | 68,200 | $9,981,752 | dollars as filed | |
| AMPRIUS TECHNOLOGIES INC COMMON STOCK | 03214Q108 | Stock | 585,000 | $9,863,100 | dollars as filed | |
| M/I HOMES INC | 55305B101 | COM | 76,400 | $9,355,180 | dollars as filed | |
| FB FINL CORP | 30257X104 | COM | 162,100 | $8,419,474 | dollars as filed | |
| ADDUS HOMECARE CORP | 006739106 | COM | 89,396 | $8,371,935 | dollars as filed | |
| CORMEDIX INC COM | 21900C308 | Stock | 1,211,115 | $8,223,471 | dollars as filed | |
| ARTIVION INC | 228903100 | COM | 221,122 | $8,097,488 | dollars as filed | |
| CECO ENVIRONMENTAL CORP | 125141101 | COM | 135,032 | $8,045,207 | dollars as filed | |
| EXPRO GROUP HOLDINGS NV | N3144W105 | COMMON STOCK | 454,600 | $7,914,586 | dollars as filed | |
| THERMON GROUP HLDGS INC | 88362T103 | COM | 154,700 | $7,796,880 | dollars as filed | |
| MAGNITE INC COM | 55955D100 | Stock | 647,600 | $7,693,488 | dollars as filed | |
| LINCOLN EDL SVCS CORP | 533535100 | COM | 188,447 | $7,666,024 | dollars as filed | |
| RADWARE LTD | M81873107 | COMMON STOCK | 286,700 | $7,545,944 | dollars as filed | |
| NPK INTERNATIONAL INC | 651718504 | COMMON STOCK | 518,150 | $7,507,994 | dollars as filed | |
| VITA COCO CO INC | 92846Q107 | COM | 156,108 | $7,479,134 | dollars as filed | |
| AMERICAN PUB ED INC | 02913V103 | COM | 130,400 | $7,417,152 | dollars as filed | |
| BABCOCK & WILCOX ENTERPRISES | 05614L209 | COM | 500,200 | $7,347,938 | dollars as filed | |
| LINDBLAD EXPEDITIONS HLDGS I | 535219109 | COM | 378,721 | $6,551,873 | dollars as filed | |
| VSE CORP COM | 918284100 | Stock | 34,008 | $6,271,075 | dollars as filed | |
| KNOWLES CORP COM | 49926D109 | Stock | 234,200 | $6,014,256 | dollars as filed | |
| 1ST SOURCE CORP COM | 336901103 | Stock | 86,200 | $5,965,902 | dollars as filed | |
| CRA INTL INC | 12618T105 | COM | 36,470 | $5,903,764 | dollars as filed | |
| GORMAN RUPP CO COM | 383082104 | Stock | 95,000 | $5,902,350 | dollars as filed | |
| BIOVENTUS INC | 09075A108 | COM CL A | 628,114 | $5,734,681 | dollars as filed | |
| PC CONNECTION INC | 69318J100 | COM | 96,200 | $5,623,852 | dollars as filed | |
| HURON CONSULTING GROUP INC | 447462102 | COM | 42,300 | $5,392,827 | dollars as filed | |
| TACTILE SYSTEMS TECHNOLOGY I | 87357P100 | COMMON STOCK | 202,839 | $5,300,183 | dollars as filed | |
| COURSERA INC COM | 22266M104 | Stock | 821,800 | $4,782,876 | dollars as filed | |
| BLACK ROCK COFFEE BAR INC A | 092244102 | COMMON STOCK | 365,600 | $4,723,552 | dollars as filed | |
| ROCKY BRANDS INC | 774515100 | COMMON STOCK | 118,000 | $4,568,960 | dollars as filed | |
| CLIMB GLOBAL SOLUTIONS INC | 946760105 | COMMON STOCK | 211,840 | $4,198,669 | dollars as filed | |
| RED VIOLET INC | 75704L104 | COMMON STOCK | 104,700 | $3,622,620 | dollars as filed | |
| SPY | 78462F103 | SHS | 2,374 | $1,544,072 | dollars as filed | |
| H WORLD GROUP LTD SPONSORED ADS | 44332N106 | ADR | 24,000 | $1,206,960 | dollars as filed | |
| Microsoft Corp | 594918104 | COM | 2,665 | $986,503 | dollars as filed | |
| JPMorgan Chase & Co | 46625H100 | COM | 3,184 | $936,470 | dollars as filed | |
| Apple Inc | 037833100 | COM | 3,531 | $896,160 | dollars as filed | |
| FUTU HLDGS LTD SPON ADS CL A | 36118L106 | ADR | 4,500 | $615,420 | dollars as filed | |
| Johnson & Johnson | 478160104 | COM | 2,294 | $560,631 | dollars as filed | |
| Alphabet Inc. Reg. Shares A | 02079K305 | COM | 1,900 | $546,403 | dollars as filed | |
| ACM RESH INC COM CL A | 00108J109 | Stock | 13,000 | $511,550 | dollars as filed | |
| Alphabet Inc. Reg. Shares C | 02079K107 | COM | 1,620 | $464,713 | dollars as filed | |
| FRESHWORKS INC CLASS A COM | 358054104 | Stock | 57,750 | $463,733 | dollars as filed | |
| TRAVELERS COMPANIES INC COM | 89417E109 | Stock | 1,582 | $461,440 | dollars as filed | |
| Amgen Inc. | 031162100 | COM | 1,036 | $364,443 | dollars as filed | |
| WEAVE COMMUNICATIONS INC | 94724R108 | COM | 72,830 | $336,475 | dollars as filed | |
| MasterCard, Inc | 57636Q104 | COM | 662 | $330,641 | dollars as filed | |
| RESMED INC COM | 761152107 | Stock | 1,450 | $325,496 | dollars as filed | |
| NEWMONT CORP | 651639106 | COM | 2,875 | $311,182 | dollars as filed | |
| BANK OF NY MELLON CORP COM | 064058100 | Stock | 2,510 | $297,802 | dollars as filed | |
| SPDR GOLD TR | 78463V107 | GOLD SHS | 675 | $290,446 | dollars as filed | |
| Caterpillar Inc. | 149123101 | COM | 408 | $289,008 | dollars as filed | |
| IBEX LTD | G4690M101 | COMMON STOCK | 10,200 | $273,564 | dollars as filed | |
| Walmart Inc. | 931142103 | COM | 2,137 | $265,632 | dollars as filed | |
| McDonalds Corporation | 580135101 | COM | 855 | $265,615 | dollars as filed | |
| WELLS FARGO & CO | 949746804 | PERP PFD CNV A | 225 | $259,875 | dollars as filed | |
| Micron Technology,Inc. | 595112103 | COM | 700 | $236,488 | dollars as filed | |
| EXXON MOBIL CORP | 30231G102 | COM | 1,303 | $221,067 | dollars as filed | |
| AFLAC INC COM | 001055102 | Stock | 2,000 | $219,420 | dollars as filed | |
| FREEPORT MCMORAN INC CL B | 35671D857 | Stock | 3,590 | $211,048 | dollars as filed | |
| Merck & Co.,Inc. | 58933Y105 | COM | 1,730 | $208,102 | dollars as filed | |
| Xenacare Hldgs, Inc. | 98401A106 | COM | 140,000 | $0 | dollars as filed | Value filed as zero, left out of ratios. |
Amendment chain
| Filing | Role | Filed | Accepted | Ingested |
|---|---|---|---|---|
| 13F-HR 0001213900-26-057307 | this filing | 2026-05-15 | acceptance time not in the bulk data set |