0001213900-21-042765.txt : 20210816 0001213900-21-042765.hdr.sgml : 20210816 20210816122348 ACCESSION NUMBER: 0001213900-21-042765 CONFORMED SUBMISSION TYPE: 13F-HR PUBLIC DOCUMENT COUNT: 2 CONFORMED PERIOD OF REPORT: 20210630 FILED AS OF DATE: 20210816 DATE AS OF CHANGE: 20210816 EFFECTIVENESS DATE: 20210816 FILER: COMPANY DATA: COMPANY CONFORMED NAME: OBERWEIS ASSET MANAGEMENT INC/ CENTRAL INDEX KEY: 0000937886 IRS NUMBER: 364106772 STATE OF INCORPORATION: MA FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: 13F-HR SEC ACT: 1934 Act SEC FILE NUMBER: 028-04688 FILM NUMBER: 211175987 BUSINESS ADDRESS: STREET 1: 3333 WARRENVILLE ROAD STREET 2: SUITE 500 CITY: LISLE STATE: IL ZIP: 60532 BUSINESS PHONE: 6305772300 MAIL ADDRESS: STREET 1: 3333 WARRENVILLE ROAD STREET 2: SUITE 500 CITY: LISLE STATE: IL ZIP: 60532 13F-HR 1 primary_doc.xml 13F-HR LIVE false false false 0000937886 XXXXXXXX 06-30-2021 06-30-2021 false OBERWEIS ASSET MANAGEMENT INC/

3333 Warrenville Road Suite 500 Lisle IL 60532

13F HOLDINGS REPORT 028-04688 N Patrick B. Joyce 800-323-6166 /s/ Patrick B. Joyce Lisle IL 08-16-2021 0 163 456492 INFORMATION TABLE 2 infotable.xml 2U, Inc. com 90214J101 342 8200 SH SOLE 8200 0 0 360 DigiTech, Inc. com 88557W101 1255 30000 SH SOLE 30000 0 0 AMR Corp Escrow com 001ESC102 0 18000 SH SOLE 18000 0 0 Absolute Software Corp. com 00386B109 1166 80500 SH SOLE 80500 0 0 Acadia Healthcare Co., Inc. com 00404A109 2698 42995 SH SOLE 24910 0 18085 Accuray Inc. com 004397105 683 151000 SH SOLE 151000 0 0 Adient Plc com G0084W101 271 6000 SH SOLE 6000 0 0 Adtran, Inc. com 00738A106 822 39800 SH SOLE 39800 0 0 Alibaba Group Holding Ltd ADR com 01609W102 435 1920 SH SOLE 130 0 1790 Allied Motion Technologies com 019330109 963 27900 SH SOLE 27900 0 0 Alpha & Omega Semiconductor com G6331P104 1368 45000 SH SOLE 45000 0 0 Alphabet, Inc. Cl C com 02079k107 251 100 SH SOLE 0 0 100 Alphatec Hldgs Inc. com 02081G201 6672 435530 SH SOLE 390520 0 45010 Amazon.com com 023135106 344 100 SH SOLE 0 0 100 Ameresco, Inc. com 02361E108 2566 40908 SH SOLE 40908 0 0 American Power Corp com 02906T107 0 10000 SH SOLE 0 0 10000 Amgen, Inc. com 031162100 365 1496 SH SOLE 0 0 1496 Amphastar Pharmaceuticals, Inc com 03209R103 214 10600 SH SOLE 10600 0 0 Angiodynamics, Inc. com 03475v101 2667 98300 SH SOLE 98300 0 0 Antares Pharma, Inc. com 036642106 875 200600 SH SOLE 200600 0 0 Apple, Inc. com 037833100 1004 7334 SH SOLE 240 0 7094 Arconic Corporation com 03966V107 1297 36400 SH SOLE 11780 0 24620 Avatar Ventures com 05350B100 0 10000 SH SOLE 0 0 10000 Avaya Hldgs Corp. com 05351X101 1971 73260 SH SOLE 42060 0 31200 Aviat Networks, Inc. com 05366Y201 2936 89607 SH SOLE 89607 0 0 Avid Bioservices, Inc. com 05368M106 1018 39700 SH SOLE 39700 0 0 Avid Technology, Inc. com 05367P100 223 5700 SH SOLE 5700 0 0 Axcelis Technologies com 054540208 5177 128080 SH SOLE 105880 0 22200 BHP Billiton Ltd. ADR com 088606108 222 3043 SH SOLE 140 0 2903 BJs Wholesale Club Holdings, I com 05550J101 1059 22250 SH SOLE 6310 0 15940 Bank of New York Mellon Corp. com 064058100 218 4248 SH SOLE 0 0 4248 Beacon Roofing Supply com 073685109 266 5000 SH SOLE 5000 0 0 Belden, Inc. com 077454106 273 5400 SH SOLE 5400 0 0 Bilibili, Inc. Spon ADR com 090040106 1474 12100 SH SOLE 12100 0 0 Boot Barn Hldgs, Inc. com 099406100 2690 32000 SH SOLE 32000 0 0 Builders Firstsource com 12008R107 1980 46420 SH SOLE 29210 0 17210 CRA Int'l Inc. com 12618T105 548 6400 SH SOLE 6400 0 0 CTS Corp. com 126501105 966 26000 SH SOLE 26000 0 0 Cabot Corp. com 127055101 273 4800 SH SOLE 4800 0 0 Cadence Design System, Inc. com 127387108 2945 21524 SH SOLE 21524 0 0 Camtek, Ltd. com M20791105 1545 40980 SH SOLE 40980 0 0 CareDx, Inc. com 14167L103 4286 46830 SH SOLE 31470 0 15360 Castle Biosciences, Inc. com 14843C105 5431 74060 SH SOLE 55660 0 18400 Central Garden & Pet Co. com 153527106 201 3800 SH SOLE 3800 0 0 ChannelAdvisor Corporation com 159179100 10252 418280 SH SOLE 326960 0 91320 Clean Harbors, Inc. com 184496107 335 3600 SH SOLE 3600 0 0 Clearfield, Inc. com 18482P103 1682 44900 SH SOLE 44900 0 0 Cohu, Inc. com 192576106 1165 31676 SH SOLE 31676 0 0 Commercial Vehicle Group com 202608105 1401 131800 SH SOLE 131800 0 0 Commvault Systems, Inc. com 204166102 305 3900 SH SOLE 3900 0 0 Constellium NV Cl A com F21107101 124920 6592097 SH SOLE 4917339 0 1674758 Cornerstone Ondemand, Inc. com 21925Y103 304 5900 SH SOLE 5900 0 0 Crocs, Inc. com 227046109 5683 48770 SH SOLE 41640 0 7130 Cross Country Healthcare, Inc. com 227483104 1418 85900 SH SOLE 85900 0 0 Cyberoptics Corp. com 232517102 991 24200 SH SOLE 24200 0 0 DZS, Inc. com 268211109 1359 65500 SH SOLE 65500 0 0 Dada Nexus Limited com 23344D108 287 9900 SH SOLE 9900 0 0 Deckers Outdoor Corp. com 243537107 7355 19150 SH SOLE 13680 0 5470 Diebold, Inc. com 253651103 1339 104300 SH SOLE 104300 0 0 El Pollo Loco Hldgs, Inc. com 268603107 1152 63000 SH SOLE 63000 0 0 Employers Holdings, Inc. com 292218104 942 22000 SH SOLE 22000 0 0 EnPro Industries, Inc. com 29355x107 1205 12400 SH SOLE 12400 0 0 Endava Plc Ads com 29260V105 67770 597721 SH SOLE 448872 0 148849 Entravision Communications com 29382r107 2214 331400 SH SOLE 331400 0 0 Extreme Networks, Inc. com 30226D106 1185 106200 SH SOLE 106200 0 0 Farfetch Ltd. com 30744W107 1294 25700 SH SOLE 25700 0 0 First Foundation Inc. com 32026V104 754 33500 SH SOLE 33500 0 0 Flexsteel Inds, Inc. com 339382103 1212 30000 SH SOLE 30000 0 0 Full House Resorts, Inc. com 359678109 1516 152543 SH SOLE 152543 0 0 Futu Holdings Ltd. com 36118L106 1164 6500 SH SOLE 6500 0 0 Golden Nugget Online Gaming, I com 38113L107 1535 120300 SH SOLE 120300 0 0 Griffon Corp. com 398433102 943 36800 SH SOLE 36800 0 0 Guess, Inc com 401617105 3899 147708 SH SOLE 105739 0 41969 Hackett Group, Inc. com 404609109 1297 72000 SH SOLE 72000 0 0 Halozyme Therapeutics, Inc. com 40637H109 3142 69200 SH SOLE 46310 0 22890 Headhunter Group Plc Spon ADR com 42207L106 288 6800 SH SOLE 6800 0 0 Healthstream Inc. com 42222N103 911 32600 SH SOLE 32600 0 0 Heidrick & Struggles com 422819102 1938 43500 SH SOLE 43500 0 0 Helix Energy Solutions Group, com 42330p107 476 83300 SH SOLE 83300 0 0 Helmerich & Payne com 423452101 750 22982 SH SOLE 9160 0 13822 Heska Corp Com Restrc New com 42805E306 230 1000 SH SOLE 1000 0 0 Hooker Furniture Corp com 439038100 987 28500 SH SOLE 28500 0 0 II-VI Inc. com 902104108 5739 79060 SH SOLE 59730 0 19330 Information Svcs Group, Inc. com 45675Y104 1375 235000 SH SOLE 235000 0 0 Inmode Ltd. com M5425M103 6690 70660 SH SOLE 59260 0 11400 Inotiv, Inc. com 45783Q100 1273 47700 SH SOLE 47700 0 0 Intel Corporation com 458140100 317 5639 SH SOLE 0 0 5639 JP Morgan Chase & Company Inc. com 46625H100 677 4352 SH SOLE 140 0 4212 Johnson & Johnson com 478160104 410 2490 SH SOLE 0 0 2490 Johnson Outdoors, Inc. com 479167108 1125 9300 SH SOLE 9300 0 0 KForce, Inc. com 493732101 1454 23100 SH SOLE 23100 0 0 Karooooo Ltd. com Y4600W108 221 6000 SH SOLE 6000 0 0 LI Auto, Inc. ADR com 50202M102 1922 55000 SH SOLE 55000 0 0 LiqTech International, Inc com 53632A201 1235 168729 SH SOLE 168729 0 0 Luna Innovations com 550351100 921 85000 SH SOLE 85000 0 0 M/I Homes, Inc. com 55305B101 1191 20300 SH SOLE 20300 0 0 MYR Group, Inc. com 55405W104 918 10100 SH SOLE 10100 0 0 Macom Technology Solutions com 55405Y100 250 3900 SH SOLE 3900 0 0 Magnolia Oil & Gas Corp. com 559663109 188 12000 SH SOLE 12000 0 0 Malibu Boats, Inc. com 56117J100 3419 46630 SH SOLE 34030 0 12600 Masonite Intl Corp. com 575385109 2468 22075 SH SOLE 16480 0 5595 Mastercard, Inc. com 57636Q104 491 1344 SH SOLE 0 0 1344 Materion Corp. com 576690101 249 3300 SH SOLE 3300 0 0 Maxlinear, Inc. Class A com 57776J100 1506 35450 SH SOLE 11350 0 24100 McDonald's Corporation com 580135101 249 1079 SH SOLE 0 0 1079 Medifast, Inc. com 58470H101 283 1000 SH SOLE 1000 0 0 Mercantile Bank Corp. com 587376104 1089 36074 SH SOLE 21500 0 14574 Merit Medical System Inc com 589889104 226 3500 SH SOLE 3500 0 0 Microsoft Corp. com 594918104 767 2830 SH SOLE 0 0 2830 Model N, Inc. com 607525102 3198 93310 SH SOLE 70110 0 23200 Movado Group, Inc. com 624580106 1517 48200 SH SOLE 48200 0 0 NOV, Inc. com 62955J103 196 12800 SH SOLE 12800 0 0 Natural Grocers By Vitamin C com 63888U108 335 31200 SH SOLE 31200 0 0 Neuronetics, Inc. com 64131A105 1258 78500 SH SOLE 78500 0 0 Newmont Mining com 651639106 392 6183 SH SOLE 400 0 5783 OOMA Inc. com 683416101 930 49300 SH SOLE 49300 0 0 Option Care Health Inc. com 68404L201 236 10800 SH SOLE 10800 0 0 Organogenesis Hlgs, Inc. com 68621F102 9334 561608 SH SOLE 466008 0 95600 PDC Energy, Inc. com 69327R101 201 4400 SH SOLE 4400 0 0 PROG Holdings, Inc. com 74319R101 217 4500 SH SOLE 4500 0 0 Patrick Industries, Inc. com 703343103 212 2900 SH SOLE 2900 0 0 Patterson-Uti Energy, Inc. com 703481101 1133 114000 SH SOLE 114000 0 0 Perficient Inc. com 71375U101 1809 22500 SH SOLE 22500 0 0 Preformed Line Prods Co. com 740444104 519 7000 SH SOLE 7000 0 0 RPC, Inc. com 749660106 938 189400 SH SOLE 189400 0 0 Radnet, Inc. com 750491102 2405 71400 SH SOLE 71400 0 0 Rapid7, Inc. com 753422104 1610 17010 SH SOLE 5350 0 11660 Realogy Hldgs Corp. com 75605Y106 211 11600 SH SOLE 11600 0 0 Red Robin Gourmet Burger com 75689M101 2622 79200 SH SOLE 79200 0 0 Resmed Inc. com 761152107 357 1450 SH SOLE 0 0 1450 Sea Ltd com 81141R100 15615 56863 SH SOLE 56863 0 0 Select Medical Hldgs. Corp com 81619Q105 347 8200 SH SOLE 8200 0 0 Shopify, Inc. com 82509L107 4850 3320 SH SOLE 3320 0 0 Shutterstock, Inc. com 825690100 7489 76282 SH SOLE 50999 0 25283 Shyft Group, Inc. com 825698103 1025 27400 SH SOLE 27400 0 0 Skyline Champion Corporation com 830830105 298 5600 SH SOLE 5600 0 0 Sterling Construction Co., Inc com 859241101 1486 61600 SH SOLE 61600 0 0 Stewart Information Services com 860372101 249 4400 SH SOLE 4400 0 0 Strattec Security Corp. com 863111100 716 16100 SH SOLE 16100 0 0 Stride, Inc. com 86333M108 254 7900 SH SOLE 7900 0 0 Summit Materials, Inc. com 86614U100 268 7700 SH SOLE 7700 0 0 Superior Industries Intl. Inc. com 868168105 1315 152498 SH SOLE 152498 0 0 Synaptics, Inc. com 87157D109 8644 55560 SH SOLE 44840 0 10720 TTEC Hldgs, Inc. com 89854H102 278 2700 SH SOLE 2700 0 0 Tempur Sealy International, In com 88023U101 1547 39471 SH SOLE 39201 0 270 Teradata Corp com 88076W103 330 6600 SH SOLE 6600 0 0 The Travelers Co., Inc. com 89417E109 355 2373 SH SOLE 0 0 2373 Titan Machinery, Inc. com 88830R101 897 29000 SH SOLE 29000 0 0 Titan Oil & Gas, Inc. com 888309101 0 10000 SH SOLE 0 0 10000 Trex Company, Inc. com 89531P105 1844 18040 SH SOLE 9780 0 8260 TrueBlue, Inc. com 89785X101 1026 36500 SH SOLE 36500 0 0 Tupperware Corp. com 899896104 1757 73990 SH SOLE 73990 0 0 Ultra Clean Holdings com 90385V107 4651 86580 SH SOLE 85970 0 610 Upwork, Inc. com 91688F104 4959 85070 SH SOLE 63100 0 21970 VOXX International Corporation com 91829F104 1177 84000 SH SOLE 84000 0 0 Varex Imaging Corp. com 92214X106 1534 57200 SH SOLE 57200 0 0 Veritiv Corp. com 923454102 2549 41500 SH SOLE 41500 0 0 Vishay Precision Group com 92835K103 1117 32800 SH SOLE 32800 0 0 Vocera Communications, Inc. com 92857F107 1611 40426 SH SOLE 40426 0 0 Wal Mart Stores Inc. com 931142103 241 1710 SH SOLE 0 0 1710 Xenacare Hldgs, Inc. com 98401A106 0 140000 SH SOLE 0 0 140000 Zumiez Inc. com 989817101 2342 47800 SH SOLE 47800 0 0 SPDR S&P 500 ETF Trust com 78462F103 1878 4388 SH SOLE 0 0 4388