Q4 2023 · 13F-HR
OBERWEIS ASSET MANAGEMENT INC/holdings as filed
Filed 2024-02-14 · accession 0001213900-24-014028
$1.07B
Reported value
192
Positions
2023-12-31
Period end
Holdings as filed
| CUSIP | Ticker | Issuer | Value | % port. | Shares | Class | Voting |
|---|---|---|---|---|---|---|---|
| F21107101 | CSTM | Constellium NV Cl A | $36.9M | 3.44% | 1,850,371 | Common | SOLE |
| 054540208 | ACLS | Axcelis Technologies | $31.8M | 2.96% | 245,329 | Common | SOLE |
| 00760J108 | AEHR | Aehr Test Systems | $28.9M | 2.70% | 1,091,202 | Common | SOLE |
| 02081G201 | ATEC | Alphatec Hldgs Inc. | $24.3M | 2.26% | 1,607,820 | Common | SOLE |
| G48833118 | WFRD | Weatherford International PLC | $23.5M | 2.19% | 240,060 | Common | SOLE |
| 03209R103 | AMPH | Amphastar Pharmaceuticals, Inc | $21.0M | 1.96% | 340,265 | Common | SOLE |
| 92337F107 | VCYT | Veracyte, Inc. | $18.1M | 1.68% | 656,810 | Common | SOLE |
| 03823U102 | AAOI | Applied Optoelectronics Inc. | $17.2M | 1.61% | 891,915 | Common | SOLE |
| 89377M109 | TMDX | TransMedics Group, Inc. | $16.8M | 1.57% | 212,900 | Common | SOLE |
| M78673114 | PERI | Perion Network, Ltd. | $14.1M | 1.31% | 456,290 | Common | SOLE |
| 91347P105 | OLED | Universal Display Corp. | $12.7M | 1.19% | 66,542 | Common | SOLE |
| 000899104 | ADMA | ADMA Biologics, Inc. | $12.3M | 1.14% | 2,710,700 | Common | SOLE |
| M20791105 | CAMT | Camtek, Ltd. | $12.1M | 1.13% | 174,480 | Common | SOLE |
| 92537N108 | VRT | Vertiv Holdings Co. | $11.2M | 1.05% | 233,672 | Common | SOLE |
| 05465P101 | AXNX* | Axonics, Inc. | $11.1M | 1.03% | 178,470 | Common | SOLE |
| 688239201 | OSK | Oshkosh Corp. | $10.7M | 1.00% | 98,899 | Common | SOLE |
| 34354P105 | FLS | Flowserve Corporation | $10.1M | 0.94% | 245,271 | Common | SOLE |
| 184496107 | CLH | Clean Harbors, Inc. | $10.0M | 0.93% | 57,055 | Common | SOLE |
| 29261A100 | EHC | Encompass Health Corporation | $9.7M | 0.90% | 145,245 | Common | SOLE |
| 35905A109 | FTDR | Frontdoor, Inc. | $9.5M | 0.89% | 271,100 | Common | SOLE |
| 405024100 | HAE | Haemonetics Corp. | $9.1M | 0.84% | 105,880 | Common | SOLE |
| 44925C103 | ICFI | ICF International, Inc. | $8.9M | 0.83% | 66,100 | Common | SOLE |
| 008073108 | AVAV | Aerovironment, Inc. | $8.8M | 0.82% | 69,800 | Common | SOLE |
| 125141101 | CECO | CECO Environmental Corp. | $8.7M | 0.81% | 426,700 | Common | SOLE |
| 90385V107 | UCTT | Ultra Clean Holdings | $8.4M | 0.79% | 247,100 | Common | SOLE |
| 70202L102 | PSN | Parsons Corp. | $8.3M | 0.78% | 133,000 | Common | SOLE |
| 077347300 | BELFB | Bel Fuse, Inc. | $8.3M | 0.77% | 124,300 | Common | SOLE |
| 98956A105 | ZETA | Zeta Global Holdings Corp. | $8.3M | 0.77% | 935,480 | Common | SOLE |
| 589889104 | MMSI | Merit Medical System Inc | $8.1M | 0.76% | 107,090 | Common | SOLE |
| 739276103 | POWI | Power Integrations | $8.1M | 0.75% | 98,195 | Common | SOLE |
| 243537107 | DECK | Deckers Outdoor Corp. | $8.1M | 0.75% | 12,045 | Common | SOLE |
| 33768G107 | FCFS | FirstCash Holdings, Inc | $8.0M | 0.75% | 74,200 | Common | SOLE |
| 01749D105 | ALGM | Allegro MicroSystems, Inc. | $7.8M | 0.73% | 257,980 | Common | SOLE |
| 719405102 | PLAB | Photronics, Inc. | $7.8M | 0.72% | 247,500 | Common | SOLE |
| 63942X106 | NVTS | Navitas Semiconductor Corp. | $7.7M | 0.72% | 959,900 | Common | SOLE |
| 859241101 | STRL | Sterling Construction Co., Inc | $7.7M | 0.72% | 88,000 | Common | SOLE |
| 095306106 | BLBD | Blue Bird Corporation | $7.7M | 0.72% | 286,700 | Common | SOLE |
| 00108J109 | ACMR | ACM Research, Inc. Class A | $7.7M | 0.72% | 393,400 | Common | SOLE |
| 313855108 | FSS | Federal Signal Corp. | $7.6M | 0.71% | 98,830 | Common | SOLE |
| 922417100 | VECO | Veeco Instruments, Inc. | $7.4M | 0.69% | 240,000 | Common | SOLE |
| 78473E103 | SPXC | SPX Technologies, Inc. | $7.4M | 0.69% | 73,000 | Common | SOLE |
| 30050B101 | EVH | Evolent Health, Inc. | $7.1M | 0.66% | 214,540 | Common | SOLE |
| 980745103 | WWD | Woodward, Inc. | $7.1M | 0.66% | 52,000 | Common | SOLE |
| 45826H109 | ITGR | Integer Holdings Corporation | $7.0M | 0.66% | 71,000 | Common | SOLE |
| 00404A109 | ACHC | Acadia Healthcare Co., Inc. | $7.0M | 0.65% | 90,200 | Common | SOLE |
| 94724R108 | WEAV | Weave Communications, Inc. | $7.0M | 0.65% | 609,400 | Common | SOLE |
| 830879102 | SKYW | Skywest Inc | $7.0M | 0.65% | 133,700 | Common | SOLE |
| 74164F103 | PRIM | Primoris Services Corp. | $7.0M | 0.65% | 209,900 | Common | SOLE |
| 458334109 | IPAR | Inter Parfums | $7.0M | 0.65% | 48,400 | Common | SOLE |
| 47103N106 | JBI | Janus International Group, Inc | $6.9M | 0.64% | 528,400 | Common | SOLE |
| 29605J106 | ESAB | ESAB Corporation | $6.9M | 0.64% | 79,100 | Common | SOLE |
| 683344105 | ONTO | Onto Innovation, Inc. | $6.8M | 0.64% | 44,600 | Common | SOLE |
| 55305B101 | MHO | M/I Homes, Inc. | $6.7M | 0.63% | 48,800 | Common | SOLE |
| 36237H101 | GIII | G-III Apparel Group Ltd. | $6.7M | 0.62% | 196,600 | Common | SOLE |
| 346375108 | FORM | Formfactor Inc. | $6.6M | 0.62% | 159,200 | Common | SOLE |
| 740367404 | PFBC | Preferred Bank | $6.5M | 0.61% | 89,600 | Common | SOLE |
| 404251100 | HNI | HNI Corp. | $6.5M | 0.60% | 154,800 | Common | SOLE |
| 64049M209 | NEO | NeoGenomics, Inc. | $6.4M | 0.59% | 392,700 | Common | SOLE |
| 55303J106 | MGPI | MGP Ingredients, Inc. | $6.3M | 0.59% | 64,450 | Common | SOLE |
| G3323L100 | FN | Fabrinet | $6.3M | 0.59% | 33,200 | Common | SOLE |
| 18467V109 | YOU | Clear Secure, Inc. | $6.3M | 0.58% | 303,500 | Common | SOLE |
| 749660106 | RES | RPC, Inc. | $6.2M | 0.58% | 858,128 | Common | SOLE |
| 88362T103 | THR | Thermon Group Hldgs Inc. | $6.2M | 0.58% | 190,700 | Common | SOLE |
| N70544106 | PL0 | Playa Hotels & Resorts N.V. | $6.1M | 0.57% | 701,500 | Common | SOLE |
| 825704109 | SIBN | SI-BONE, Inc. | $6.0M | 0.56% | 287,100 | Common | SOLE |
| 71639T106 | PETQEUR | PetlQ Inc | $6.0M | 0.56% | 304,400 | Common | SOLE |
| 91688F104 | UPWK | Upwork, Inc. | $5.9M | 0.55% | 396,900 | Common | SOLE |
| 14888U101 | CPRX | Catalyst Pharmaceuticals, Inc. | $5.9M | 0.55% | 348,600 | Common | SOLE |
| 268158201 | DVAX | Dynavax Technologies Corp. | $5.8M | 0.54% | 417,400 | Common | SOLE |
| 747316107 | KWR | Quaker Chemical Corporation | $5.8M | 0.54% | 27,000 | Common | SOLE |
| 302301106 | EZPW | EZCorp, Inc. | $5.7M | 0.53% | 655,500 | Common | SOLE |
| 92839U206 | VC | Visteon Corp. | $5.5M | 0.51% | 43,770 | Common | SOLE |
| 86800U104 | SMCIUSD | Super Micro Computer Inc. | $5.4M | 0.51% | 19,100 | Common | SOLE |
| 09180C106 | BJRI | BJ's Restaurants, Inc. | $5.4M | 0.50% | 148,600 | Common | SOLE |
| 53815P108 | RAMP | Liveramp Hldgs, Inc. | $5.3M | 0.49% | 139,000 | Common | SOLE |
| 404030108 | HEESEUR | H&E Equipment Services, Inc. | $5.2M | 0.48% | 98,900 | Common | SOLE |
| 04621X108 | AIZ | Assurant, Inc. | $5.2M | 0.48% | 30,700 | Common | SOLE |
| 45674M101 | INFA1EUR | Informatica Corp. | $5.2M | 0.48% | 182,100 | Common | SOLE |
| 607828100 | MOD | Modine Mfg Co Com | $5.2M | 0.48% | 86,500 | Common | SOLE |
| 00737L103 | CVSA | Adtalem Global Education Inc. | $5.1M | 0.47% | 86,500 | Common | SOLE |
| 77936F103 | — | Rover Group, Inc. | $5.1M | 0.47% | 466,200 | Common | SOLE |
| 577933104 | MMS | Maximus, Inc. | $5.1M | 0.47% | 60,400 | Common | SOLE |
| 14574X104 | TASTUSD | Carrols Restaurant Group, Inc. | $4.9M | 0.46% | 623,500 | Common | SOLE |
| 47580P103 | JELD | JELD-WEN Holding, Inc. | $4.9M | 0.46% | 260,200 | Common | SOLE |
| 447462102 | HURN | Huron Consulting Group, Inc. | $4.9M | 0.45% | 47,500 | Common | SOLE |
| 002896207 | ANF | Abercrombie & Fitch Co. | $4.9M | 0.45% | 55,000 | Common | SOLE |
| 65290E101 | NXT | Nextracker, Inc. | $4.8M | 0.45% | 103,200 | Common | SOLE |
| 553498106 | MSA | MSA Safety Inc | $4.7M | 0.44% | 28,100 | Common | SOLE |
| 866683105 | SNCY | Sun Country Airlines Holdings, | $4.7M | 0.44% | 297,700 | Common | SOLE |
| 82706C108 | SIMO | Silicon Motion Techn ADR | $4.7M | 0.44% | 76,400 | Common | SOLE |
| 92242T101 | VVX | V2X, Inc. | $4.7M | 0.44% | 100,700 | Common | SOLE |
| 227046109 | CROX | Crocs, Inc. | $4.7M | 0.44% | 50,000 | Common | SOLE |
| 01741R102 | ATI | ATI, Inc. | $4.7M | 0.43% | 102,500 | Common | SOLE |
| 228903100 | AORT | Artivion, Inc | $4.6M | 0.43% | 258,000 | Common | SOLE |
| 743713109 | PRLB | Proto Labs Inc. | $4.6M | 0.43% | 117,400 | Common | SOLE |
| 671044105 | OSIS | Osi Systems, Inc. | $4.6M | 0.42% | 35,300 | Common | SOLE |
| 516806205 | 8LP1 | Vital Energy, Inc. | $4.5M | 0.42% | 99,700 | Common | SOLE |
| 53263P105 | LMB | Limbach Hldgs, Inc. | $4.5M | 0.42% | 99,494 | Common | SOLE |
| 31188V100 | FSLY | Fastly, Inc. | $4.4M | 0.41% | 249,800 | Common | SOLE |
| 004498101 | ACIW | ACI Worldwide Inc. | $4.4M | 0.41% | 144,262 | Common | SOLE |
| Y41053102 | INSW | International Seaways, Inc. | $4.3M | 0.40% | 94,600 | Common | SOLE |
| 918284100 | VSEC | VSE Corp. | $4.3M | 0.40% | 66,300 | Common | SOLE |
| 05366Y201 | AVNW | Aviat Networks, Inc. | $4.2M | 0.39% | 129,207 | Common | SOLE |
| 030111207 | AMSC | American Superconductor | $4.2M | 0.39% | 375,800 | Common | SOLE |
| 26856L103 | ELF | e.l.f. Beauty, Inc. | $4.1M | 0.38% | 28,500 | Common | SOLE |
| 974155103 | WING | Wingstop, Inc. | $4.1M | 0.38% | 15,900 | Common | SOLE |
| 609027107 | MCRI | Monarch Casino & Resort, Inc. | $4.0M | 0.38% | 58,500 | Common | SOLE |
| 099406100 | BOOT | Boot Barn Hldgs, Inc. | $4.0M | 0.37% | 51,600 | Common | SOLE |
| 30052C107 | EOLS | Evolus, Inc. | $3.9M | 0.36% | 371,400 | Common | SOLE |
| G5509L101 | LIVN | LivaNova Plc | $3.8M | 0.36% | 74,200 | Common | SOLE |
| 68404L201 | OPCH | Option Care Health Inc. | $3.8M | 0.36% | 113,700 | Common | SOLE |
| 18538R103 | CLW | Clearwater Paper Corp | $3.8M | 0.35% | 103,900 | Common | SOLE |
| 39874R101 | GO | Grocery Outlet Hldg Corp. | $3.8M | 0.35% | 139,200 | Common | SOLE |
| 525558201 | LMAT | LeMaitre Vascular, Inc. | $3.7M | 0.35% | 65,300 | Common | SOLE |
| 42330P107 | HLX | Helix Energy Solutions Group, | $3.7M | 0.34% | 357,400 | Common | SOLE |
| 722304102 | PDD | PDD Holdings Inc. | $3.7M | 0.34% | 25,000 | Common | SOLE |
| 199908104 | FIX | Comfort Systems USA Inc. | $3.6M | 0.34% | 17,700 | Common | SOLE |
| 74167P108 | BCBUSD | Primo Water Corp. | $3.6M | 0.34% | 240,800 | Common | SOLE |
| 40637H109 | HALO | Halozyme Therapeutics, Inc. | $3.6M | 0.33% | 96,300 | Common | SOLE |
| 38526M106 | LOPE | Grand Canyon Education, Inc. | $3.5M | 0.33% | 26,800 | Common | SOLE |
| P73684113 | OSW | OneSpaWorld Holdings Limited | $3.5M | 0.33% | 248,400 | Common | SOLE |
| 74758T303 | QLYS | Qualys, Inc. | $3.5M | 0.32% | 17,600 | Common | SOLE |
| 587376104 | MBWM | Mercantile Bank Corp. | $3.4M | 0.32% | 85,315 | Common | SOLE |
| 127387108 | CDNS | Cadence Design System, Inc. | $3.4M | 0.32% | 12,600 | Common | SOLE |
| 374689107 | ROCK | Gibraltar Inds | $3.4M | 0.32% | 43,300 | Common | SOLE |
| 12763L105 | CDRE | Cadre Hldgs, Inc. | $3.4M | 0.31% | 102,400 | Common | SOLE |
| 78349D107 | RXST | RxSight, Inc. | $3.4M | 0.31% | 83,100 | Common | SOLE |
| 829073105 | SSD | Simpson Manufacturing | $3.3M | 0.31% | 16,800 | Common | SOLE |
| 89531P105 | TREX | Trex Company, Inc. | $3.3M | 0.31% | 40,100 | Common | SOLE |
| 336901103 | SRCE | 1st Source Corp. | $3.3M | 0.31% | 60,000 | Common | SOLE |
| 292218104 | EIG | Employers Holdings, Inc. | $3.3M | 0.30% | 82,500 | Common | SOLE |
| 74022D407 | PDS | Precision Drilling Corp. | $3.2M | 0.30% | 59,700 | Common | SOLE |
| 62955J103 | NOV | NOV, Inc. | $3.2M | 0.30% | 156,900 | Common | SOLE |
| 691497309 | OXM | Oxford Inds, Inc. | $3.1M | 0.29% | 31,500 | Common | SOLE |
| 580589109 | MGRC | McGrath RentCorp | $3.1M | 0.29% | 26,100 | Common | SOLE |
| 42722X106 | HFWA | Heritage Financial Corporation | $3.0M | 0.28% | 140,400 | Common | SOLE |
| 576485205 | MTDR | Matador Resources Company | $3.0M | 0.28% | 52,800 | Common | SOLE |
| 320817109 | FRME | First Merchants Corporation | $2.9M | 0.27% | 79,200 | Common | SOLE |
| Y2106R110 | LPG | Dorian LPG Ltd. | $2.9M | 0.27% | 65,500 | Common | SOLE |
| 830940102 | SKWD | Skyward Specialty Ins Group | $2.8M | 0.26% | 81,800 | Common | SOLE |
| 749527107 | 1RG | Rev Group, Inc. | $2.8M | 0.26% | 151,700 | Common | SOLE |
| 753422104 | RPD | Rapid7, Inc. | $2.8M | 0.26% | 48,200 | Common | SOLE |
| 92846Q107 | COCO | The Vita Coco Co., Inc. | $2.7M | 0.25% | 106,600 | Common | SOLE |
| 129500104 | CAL | Caleres Inc. | $2.7M | 0.25% | 88,400 | Common | SOLE |
| 000360206 | AAON | AAON, Inc. | $2.7M | 0.25% | 36,300 | Common | SOLE |
| 294268107 | PLUS | EPlus, Inc. | $2.7M | 0.25% | 33,300 | Common | SOLE |
| 267475101 | DY | Dycom Industries, Inc. | $2.6M | 0.25% | 23,000 | Common | SOLE |
| 420261109 | HWKN | Hawkins, Inc. | $2.6M | 0.25% | 37,500 | Common | SOLE |
| 56400P706 | MNKD | Mannkind Corp. | $2.6M | 0.25% | 722,800 | Common | SOLE |
| 09227Q100 | BLKB | Blackbaud | $2.6M | 0.24% | 30,100 | Common | SOLE |
| 42226A107 | HQY | HealthEquity Inc. | $2.6M | 0.24% | 38,700 | Common | SOLE |
| 739128106 | POWL | Powell Industries Inc. | $2.5M | 0.24% | 28,600 | Common | SOLE |
| 144285103 | CRS | Carpenter Technology Corp. | $2.5M | 0.24% | 35,700 | Common | SOLE |
| 86333M108 | LRN | Stride, Inc. | $2.5M | 0.24% | 42,500 | Common | SOLE |
| 559663109 | MGY | Magnolia Oil & Gas Corp. | $2.5M | 0.23% | 117,200 | Common | SOLE |
| 53115L104 | LBRT | Liberty Energy, Inc. | $2.5M | 0.23% | 137,400 | Common | SOLE |
| 80874P109 | LNWO | Light & Wonder Inc. | $2.5M | 0.23% | 30,100 | Common | SOLE |
| 04963C209 | ATRC | Atricure, Inc. | $2.5M | 0.23% | 69,100 | Common | SOLE |
| 428567101 | HB6 | Hibbett, Inc. | $2.5M | 0.23% | 34,100 | Common | SOLE |
| 383082104 | GRC | The Gorman-Rupp Co. | $2.4M | 0.23% | 68,900 | Common | SOLE |
| 74766Q101 | QTRX | Quanterix Corp. | $2.4M | 0.22% | 87,800 | Common | SOLE |
| 00182C103 | ANIP | ANI Pharmaceuticals, Inc. | $2.4M | 0.22% | 43,500 | Common | SOLE |
| 893529107 | TRNS | Transcat, Inc. | $2.4M | 0.22% | 21,800 | Common | SOLE |
| 604749101 | MIRM | Mirum Pharmaceuticals, Inc. | $2.3M | 0.21% | 77,400 | Common | SOLE |
| 693282105 | PDFS | Pdf Solutions, Inc. | $2.2M | 0.21% | 69,500 | Common | SOLE |
| 292765104 | EPAC | Enerpac Tool Group Corp. | $2.2M | 0.21% | 71,300 | Common | SOLE |
| 053604104 | AVPT | AvePoint, Inc. | $2.0M | 0.18% | 241,100 | Common | SOLE |
| 874039100 | TSM | Taiwan Semiconductor | $1.8M | 0.16% | 17,000 | Common | SOLE |
| 78462F103 | SPY | SPDR S&P 500 ETF Trust | $1.7M | 0.16% | 3,588 | Common | NONE |
| 66981J102 | MNSO | MINISO Group Holding Limited | $1.6M | 0.15% | 80,400 | Common | SOLE |
| 50202M102 | LI | Li Auto, Inc. ADR | $1.2M | 0.12% | 33,000 | Common | SOLE |
| 359678109 | FLL | Full House Resorts, Inc. | $1.2M | 0.11% | 223,143 | Common | SOLE |
| 594918104 | MSFT | Microsoft Corp. | $1.0M | 0.10% | 2,735 | Common | NONE |
| 52490G102 | LEGN | Legend Biotech Corp. | $962,720 | 0.09% | 16,000 | Common | SOLE |
| 874080104 | TAL | Tal Education Group ADR | $694,650 | 0.06% | 55,000 | Common | SOLE |
| 037833100 | AAPL | Apple, Inc. | $650,917 | 0.06% | 3,381 | Common | NONE |
| 46625H100 | JPM | JP Morgan Chase & Company Inc. | $646,723 | 0.06% | 3,802 | Common | NONE |
| 205768302 | CRK | Comstock Res | $639,809 | 0.06% | 72,295 | Common | SOLE |
| 89417E109 | TRV | The Travelers Co., Inc. | $393,581 | 0.04% | 2,066 | Common | NONE |
| G0457F107 | ARCO | Arcos Dorados Holdings, Inc. | $380,700 | 0.04% | 30,000 | Common | SOLE |
| 478160104 | JNJ | Johnson & Johnson | $339,292 | 0.03% | 2,165 | Common | NONE |
| 57636Q104 | MA | Mastercard, Inc. | $330,737 | 0.03% | 775 | Common | NONE |
| G9470A102 | VTEX | VTEX | $322,672 | 0.03% | 46,900 | Common | SOLE |
| 464287648 | IWO | iShares TR Russell 2000 Growth | $308,970 | 0.03% | 1,225 | Common | NONE |
| 031162100 | AMGN | Amgen, Inc. | $308,012 | 0.03% | 1,069 | Common | NONE |
| 580135101 | MCD | McDonald's Corporation | $249,935 | 0.02% | 843 | Common | NONE |
| 761152107 | RMD | Resmed Inc. | $249,429 | 0.02% | 1,450 | Common | NONE |
| G27358103 | DESP1EUR | Despegar Com Corp. | $212,850 | 0.02% | 22,500 | Common | SOLE |
| 46267X108 | IQ | iQIYI, Inc. | $97,600 | 0.01% | 20,000 | Common | SOLE |
| 23344D108 | D0A | Dada Nexus Limited | $75,696 | 0.01% | 22,800 | Common | SOLE |
| 98401A106 | — | Xenacare Hldgs, Inc. | $0 | — | 140,000 | Common | NONE |
| 001ESC102 | — | AMR Corp Escrow | $0 | — | 18,000 | Common | SOLE |
Source: SEC EDGAR · raw 13F holdings as filed. The Class column shows the option type when reported (Put/Call) or Common when the issuer's equity is held directly. 13F discloses long positions only.