Oberweis Asset Management Inc./

In its 13F for Q1 2025 (holdings as of March 31, 2025, filed May 15, 2025), Oberweis Asset Management Inc./ reported 192 stock positions worth $2.0 billion. Its top holding was Adma Biologics (ADMA) at 3.4% of the portfolio, followed by Credo Technology Group Holdi (CRDO, 2.5%) and Sharkninja (SN, 2.1%). Compared with Q4 2024, it opened 24 new positions, sold out of 28, added to 67 and reduced 19. The biggest buy was a new position in Life Time (LTH) and the biggest sale an exit from Abercrombie & Fitch Class A (ANF).

Most Recent 13F
Q2 2026
Location
LISLE, IL
CIK
0000937886
Portfolio Value
$2.0B (Q1 2025)
SEC Filing
0001213900-25-043859 ↗ filed May 15, 2025

Holdings Value

0$1.0B$2.0B$3.0B$4.0B$5.0B Q1 2024: $1.4B Q1 2024 Q2 2024: $1.6B Q2 2024 Q3 2024: $2.0B Q3 2024 Q4 2024: $2.1B Q4 2024 Q1 2025: $2.0B $2.0B Q1 2025 Q2 2025: $2.3B Q2 2025 Q3 2025: $2.6B Q3 2025 Q4 2025: $2.7B Q4 2025 Q1 2026: $3.4B Q1 2026 Q2 2026: $4.8B Q2 2026

Holdings 192 stocks · $2.0B
ADMA Adma Biologics Inc. 3.39% 3,426,260 $68.0M Add +2.5%
CRDO Credo Technology Group Holdi 2.52% 1,259,915 $50.6M Add +31.3%
SN Sharkninja Inc. 2.08% 500,160 $41.7M Add +0.2%
EHC Encompass Health Corp. 1.87% 370,720 $37.5M Add +8.8%
DOCS Doximity Inc. Class A 1.69% 584,060 $33.9M Add +1.9%
AMBA Ambarella Inc. 1.43% 568,825 $28.6M Add +211.2%
ITRI Itron Inc. 1.42% 272,510 $28.5M Add +36.9%
SKYW Skywest Inc. 1.39% 319,150 $27.9M No change
WAY Waystar Holding Corp. 1.33% 713,040 $26.6M Add +208.3%
G Genpact Ltd. 1.31% 523,600 $26.4M No change
RMBS Rambus Inc. 1.31% 507,350 $26.3M Add +23.9%
LRN Stride Inc. 1.31% 207,300 $26.2M No change
DORM Dorman Products Inc. 1.25% 208,520 $25.1M Add +16.0%
FLS Flowserve Corp. 1.25% 513,184 $25.1M Add +9.5%
ZETA Zeta Global Holdings Corp. Class A 1.25% 1,843,240 $25.0M Add +0.2%
SRAD Sportradar Group AG-A 1.23% 1,144,700 $24.7M Add +57.0%
FRSH Freshworks Inc. Class A 1.22% 1,728,520 $24.4M Add +109.1%
LTH Life Time Group Holdings Inc. 1.20% 797,000 $24.1M New
MTSI Macom Technology Solutions H 1.16% 232,520 $23.3M Add +29.9%
FTDR Frontdoor Inc. 1.15% 599,460 $23.0M Add +28.2%
VCYT Veracyte Inc. 1.14% 769,350 $22.8M Add +2.8%
PRMB Primo Brands Corp. 1.12% 632,400 $22.4M No change
MMSI Merit Medical Systems Inc. 1.10% 208,560 $22.0M Reduce -0.1%
CLH Clean Harbors Inc. 1.08% 110,320 $21.7M Add +7.7%
ICUI Icu Medical Inc. 1.08% 155,690 $21.6M Reduce -0.6%
AAOI Applied Optoelectronics Inc. 1.06% 1,384,841 $21.3M Add +179.3%
ACIW Aci Worldwide Inc. 1.05% 386,202 $21.1M Add +16.0%
NVMI Nova Ltd. 1.02% 111,000 $20.5M No change
BRBR Bellring Brands Inc. 1.01% 273,300 $20.3M Add +8.0%
DOCN Digitalocean Holdings Inc. 0.98% 586,500 $19.6M Add +37.8%
OSIS Osi Systems Inc. 0.97% 100,400 $19.5M No change
QTWO Q2 Holdings Inc. filed as Q2 HLDGS INC 0.97% 242,990 $19.4M Add +108.6%
DECK Deckers Outdoor Corp. 0.95% 169,870 $19.0M Add +106.3%
BOX Box Inc. Class A 0.92% 597,100 $18.4M Add +6.9%
MRCY Mercury Systems Inc. 0.89% 412,300 $17.8M New
COOP Mr Cooper Group Inc. 0.88% 147,100 $17.6M No change
PSN Parsons Corp. 0.86% 291,460 $17.3M Add +9.0%
AIZ Assurant Inc. 0.85% 81,000 $17.0M No change
FSS Federal Signal Corp. 0.84% 229,830 $16.9M No change
CVLT Commvault Systems Inc. 0.84% 107,000 $16.9M New
GAP The Gap Inc. 0.84% 817,600 $16.9M Add +12.5%
FN Fabrinet 0.83% 84,600 $16.7M Add +32.6%
CCS Century Communities Inc. 0.83% 248,000 $16.6M No change
SFM Sprouts Farmers Market Inc. 0.83% 108,500 $16.6M No change
BFAM Bright Horizons Family Solut 0.82% 129,904 $16.5M No change
YOU Clear Secure Inc. Class A 0.79% 609,400 $15.8M No change
ONTO Onto Innovation Inc. 0.78% 129,175 $15.7M Reduce -0.1%
ACA Arcosa Inc. 0.78% 203,000 $15.7M No change
LOPE Grand Canyon Education Inc. 0.76% 88,700 $15.3M Add +24.6%
IMAX Imax Corp. 0.76% 579,600 $15.3M No change
CRS Carpenter Technology 0.74% 81,411 $14.7M Reduce -2.4%
CARG Cargurus Inc. 0.73% 500,000 $14.6M No change
DLB Dolby Laboratories Inc. Class A 0.72% 181,000 $14.5M No change
PRIM Primoris Services Corp. 0.70% 242,900 $13.9M No change
PEGA Pegasystems Inc. 0.68% 195,400 $13.6M Add +34.3%
BROS Dutch Bros Inc. Class A 0.67% 219,000 $13.5M No change
CLBT Cellebrite Di Ltd. 0.67% 692,910 $13.5M No change
UCTT Ultra Clean Holdings Inc. 0.65% 613,300 $13.1M No change
CBT Cabot Corp. 0.63% 152,800 $12.7M No change
AIR Aar Corp. 0.61% 220,000 $12.3M New
AMSC American Superconductor Corp. 0.60% 668,200 $12.1M Add +0.6%
CAMT Camtek Ltd. 0.58% 199,980 $11.7M No change
OMCL Omnicell Inc. 0.58% 333,200 $11.6M No change
BLBD Blue Bird Corp. 0.58% 358,900 $11.6M No change
CPRX Catalyst Pharmaceuticals Inc. 0.57% 467,600 $11.3M Add +0.1%
WGS Genedx Holdings Corp. 0.55% 123,500 $10.9M No change
NOV Nov Inc. 0.54% 716,400 $10.9M New
RSI Rush Street Interactive Inc. 0.53% 991,900 $10.6M No change
CBSH Commerce Bancshares Inc. 0.52% 167,790 $10.4M No change
EZPW Ezcorp Inc. Class A 0.50% 685,500 $10.1M No change
UAA Under Armour Inc. Class A 0.50% 1,593,200 $10.0M Add +38.1%
FIVN FIVE9 Inc. 0.50% 366,600 $10.0M New
SPXC SPX Technologies Inc. 0.48% 75,400 $9.7M No change
DUOL Duolingo 0.48% 31,000 $9.6M No change
PLYA Playa Hotels & Resorts NV 0.47% 705,100 $9.4M No change
HQY Healthequity Inc. 0.47% 105,900 $9.4M Add +15.7%
MGY Magnolia Oil & Gas Corp. Class A 0.46% 369,200 $9.3M Add +20.5%
SIMO Silicon Motion Technol-ADR 0.46% 183,100 $9.3M Add +16.0%
QLYS Qualys Inc. 0.45% 72,100 $9.1M Add +50.8%
EXLS Exlservice Holdings Inc. 0.45% 190,800 $9.0M No change
MTDR Matador Resources Co. 0.45% 175,300 $9.0M Add +21.1%
WEAV Weave Communications Inc. 0.43% 779,200 $8.6M Add +1.2%
AGX Argan Inc. 0.43% 65,790 $8.6M Add +43.3%
LMAT Lemaitre Vascular Inc. 0.43% 102,065 $8.6M Reduce -0.2%
KRYS Krystal Biotech Inc. 0.42% 46,800 $8.4M No change
TILE Interface Inc. 0.42% 425,300 $8.4M Reduce -11.4%
FCFS Firstcash Holdings Inc. 0.42% 70,100 $8.4M No change
OSPN Onespan Inc. 0.42% 546,350 $8.3M Add +0.2%
ABCB Ameris Bancorp 0.41% 144,100 $8.3M No change
LMB Limbach Holdings Inc. 0.41% 110,800 $8.3M No change
EOLS Evolus Inc. 0.41% 677,600 $8.2M No change
MD Pediatrix Medical Group Inc. 0.39% 545,600 $7.9M Add +16.9%
GDYN Grid Dynamics Holdings Inc. 0.39% 503,000 $7.9M No change
SEI Solaris Energy Infrastructur 0.39% 360,000 $7.8M New
OSW Onespaworld Holdings Ltd. 0.39% 465,400 $7.8M No change
BOOT Boot Barn Holdings Inc. 0.39% 72,700 $7.8M Add +43.1%
TPC Tutor Perini Corp. 0.39% 336,200 $7.8M New
ICHR Ichor Holdings Ltd. 0.38% 337,800 $7.6M No change
CDNA Caredx Inc. 0.37% 423,271 $7.5M Reduce -0.1%
OSCR Oscar Health Inc. Class A 0.37% 568,330 $7.5M Reduce -4.3%

Show all 192 holdings

Portfolio Sells Q4 2024 → Q1 2025
ANF Abercrombie & Fitch Co. Class A Sold out 0.00% −1.04
HIMS Hims & Hers Health Inc. Sold out 0.00% −0.96
LIVN Livanova PLC Reduce -97.5% 0.02% −0.94
WFRD Weatherford International PL Sold out 0.00% −0.93
TNDM Tandem Diabetes Care Inc. Sold out 0.00% −0.86
HAE Haemonetics Corp. Sold out 0.00% −0.83
ELF Elf Beauty Inc. Sold out 0.00% −0.81
AVAV Aerovironment Inc. Sold out 0.00% −0.75
FORM Formfactor Inc. Sold out 0.00% −0.70
OLED Universal Display Corp. Sold out 0.00% −0.68
FRPT Freshpet Inc. Sold out 0.00% −0.66
NEO Neogenomics Inc. Sold out 0.00% −0.60
STRA Strategic Education Inc. Sold out 0.00% −0.59
PAYO Payoneer Global Inc. Sold out 0.00% −0.41
ICFI Icf International Inc. Sold out 0.00% −0.38
WING Wingstop Inc. Sold out 0.00% −0.38
AMPH Amphastar Pharmaceuticals Inc. Sold out 0.00% −0.32
PRG Prog Holdings Inc. Sold out 0.00% −0.29
VECO Veeco Instruments Inc. Sold out 0.00% −0.26
ONTO Onto Innovation Inc. Reduce -0.1% 0.78% −0.23
PLAB Photronics Inc. Sold out 0.00% −0.21
BLND Blend Labs Inc. Class A Sold out 0.00% −0.19
AORT Artivion Inc. Reduce -39.1% 0.23% −0.19
THRM Gentherm Inc. Sold out 0.00% −0.17
USAP Universal Stainless & Alloy Sold out 0.00% −0.17
ULH Universal Logistics Holdings Sold out 0.00% −0.15
SEMR Semrush Holdings Inc. Class A Sold out 0.00% −0.13
TILE Interface Inc. Reduce -11.4% 0.42% −0.13
TSM Taiwan Semiconductor-SP ADR Sold out 0.00% −0.10
ICUI Icu Medical Inc. Reduce -0.6% 1.08% −0.07
SHOP Shopify Inc. Class A Sold out 0.00% −0.06
CDNA Caredx Inc. Reduce -0.1% 0.37% −0.05
COCO The Vita Coco Co. Inc. Reduce -0.7% 0.35% −0.05
SPY SS SPDR S&P 500 ETF Trust-US Reduce -38.0% 0.06% −0.04
RXST Rxsight Inc. Sold out 0.00% −0.03
CDNS Cadence Design SYS Inc. Reduce -11.0% 0.09% −0.02
IWO iShares Russell 2000 Growth Sold out 0.00% −0.02
LMAT Lemaitre Vascular Inc. Reduce -0.2% 0.43% −0.02
OSCR Oscar Health Inc. Class A Reduce -4.3% 0.37% −0.00
TAL Tal Education Group- ADR Reduce -33.3% 0.03% −0.00
PDD PDD Holdings Inc. Reduce -25.0% 0.05% −0.00
ACMR Acm Research Inc. Class A Reduce -38.8% 0.35% +0.00
MA Mastercard Inc. Class A Reduce -0.7% 0.02% +0.00
TRV The Travelers Cos Inc. Reduce -0.9% 0.03% +0.00
CRS Carpenter Technology Reduce -2.4% 0.74% +0.07
ARIS WATER SOLUTIONS INC-A Reduce -3.7% 0.35% +0.09
MMSI Merit Medical Systems Inc. Reduce -0.1% 1.10% +0.15

Portfolio Buys Q4 2024 → Q1 2025
LTH Life Time Group Holdings Inc. New 1.20% +1.20
WAY Waystar Holding Corp. Add +208.3% 1.33% +0.93
MRCY Mercury Systems Inc. New 0.89% +0.89
CVLT Commvault Systems Inc. New 0.84% +0.84
AMBA Ambarella Inc. Add +211.2% 1.43% +0.80
ADMA Adma Biologics Inc. Add +2.5% 3.39% +0.69
SRAD Sportradar Group AG-A Add +57.0% 1.23% +0.64
AIR Aar Corp. New 0.61% +0.61
FRSH Freshworks Inc. Class A Add +109.1% 1.22% +0.59
NOV Nov Inc. New 0.54% +0.54
FIVN FIVE9 Inc. New 0.50% +0.50
QTWO Q2 Holdings Inc. Add +108.6% 0.97% +0.42
ITRI Itron Inc. Add +36.9% 1.42% +0.40
SEI Solaris Energy Infrastructur New 0.39% +0.39
TPC Tutor Perini Corp. New 0.39% +0.39
EHC Encompass Health Corp. Add +8.8% 1.87% +0.39
IDCC Interdigital Inc. New 0.34% +0.34
DOCN Digitalocean Holdings Inc. Add +37.8% 0.98% +0.29
RMBS Rambus Inc. Add +23.9% 1.31% +0.29
CRAI Cra International Inc. New 0.26% +0.26
DOCS Doximity Inc. Class A Add +1.9% 1.69% +0.25
ACIW Aci Worldwide Inc. Add +16.0% 1.05% +0.24
DCTH Delcath Systems Inc. New 0.23% +0.23
FARO Faro Technologies Inc. New 0.22% +0.22
LOPE Grand Canyon Education Inc. Add +24.6% 0.76% +0.22
AAOI Applied Optoelectronics Inc. Add +179.3% 1.06% +0.20
IBEX Ibex Ltd. New 0.18% +0.18
FN Fabrinet Add +32.6% 0.83% +0.17
SG Sweetgreen Inc. Class A Add +160.0% 0.31% +0.17
RDVT Red Violet Inc. New 0.16% +0.16
DECK Deckers Outdoor Corp. Add +106.3% 0.95% +0.16
DORM Dorman Products Inc. Add +16.0% 1.25% +0.16
LINC Lincoln Educational Services New 0.15% +0.15
CRMD Cormedix Inc. New 0.15% +0.15
LYTS Lsi Industries Inc. New 0.14% +0.14
QLYS Qualys Inc. Add +50.8% 0.45% +0.14
AGX Argan Inc. Add +43.3% 0.43% +0.13
CLMB Climb Global Solutions Inc. New 0.13% +0.13
MGY Magnolia Oil & Gas Corp. Class A Add +20.5% 0.46% +0.13
AIOT Powerfleet Inc. Add +97.2% 0.29% +0.12
BRBR Bellring Brands Inc. Add +8.0% 1.01% +0.12
CPRX Catalyst Pharmaceuticals Inc. Add +0.1% 0.57% +0.11
MD Pediatrix Medical Group Inc. Add +16.9% 0.39% +0.11
SPOT Spotify Technology SA Add +117.4% 0.14% +0.09
BOX Box Inc. Class A Add +6.9% 0.92% +0.09
FRME First Merchants Corp. Add +22.5% 0.36% +0.09
WLDN Willdan Group Inc. Add +37.5% 0.22% +0.08
SE Sea Ltd.-ADR New 0.07% +0.07
ARDX Ardelyx Inc. Add +47.1% 0.21% +0.07
MTSI Macom Technology Solutions H Add +29.9% 1.16% +0.07

All Filings

QuarterPositions13F Reported ValueTop Holdings
Q2 2026 175$4.8BCRDO, AAOI, DOCN, SIMO, UCTT
Q1 2026 179$3.4BAAOI, LITE, CRDO, DOCN, SN
Q4 2025 178$2.7BLITE, CRDO, AAOI, SN, AMBA
Q3 2025 183$2.6BCRDO, LITE, RMBS, AMBA, SN
Q2 2025 185$2.3BCRDO, ADMA, AAOI, SN, EHC
Q1 2025 192$2.0BADMA, CRDO, SN, EHC, DOCS
Q4 2024 196$2.1BCRDO, ADMA, SN, ZETA, SKYW
Q3 2024 206$2.0BADMA, SN, ZETA, EHC, WFRD
Q2 2024 197$1.6BWFRD, CSTM, SN, ONTO, TMDX
Q1 2024 196$1.4BCSTM, WFRD, ACLS, ONTO, ATEC