Oberweis Asset Management Inc./

In its 13F for Q4 2025 (holdings as of December 31, 2025, filed February 17, 2026), Oberweis Asset Management Inc./ reported 178 stock positions worth $2.7 billion. Its top holding was Lumentum (LITE) at 3.8% of the portfolio, followed by Credo Technology Group Holdi (CRDO, 3.6%) and Applied Optoelectronics (AAOI, 2.6%). Compared with Q3 2025, it opened 20 new positions, sold out of 25, added to 104 and reduced 20. The biggest buy was a new position in Globus Medical Class A (GMED) and the biggest sale an exit from Adma Biologics (ADMA).

Most Recent 13F
Q2 2026
Location
LISLE, IL
CIK
0000937886
Portfolio Value
$2.7B (Q4 2025)
SEC Filing
0001213900-26-017101 ↗ filed Feb 17, 2026

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 Q1 2025 Q2 2025: $2.3B Q2 2025 Q3 2025: $2.6B Q3 2025 Q4 2025: $2.7B $2.7B Q4 2025 Q1 2026: $3.4B Q1 2026 Q2 2026: $4.8B Q2 2026

Holdings 178 stocks · $2.7B
LITE Lumentum Holdings Inc. 3.79% 280,930 $103.5M Reduce -14.5%
CRDO Credo Technology Group Holdi 3.55% 675,388 $97.2M Add +4.9%
AAOI Applied Optoelectronics Inc. 2.60% 2,039,641 $71.1M Add +8.0%
SN Sharkninja Inc. 2.15% 526,310 $58.9M Add +9.0%
AMBA Ambarella Inc. 1.60% 617,860 $43.8M Add +1.1%
RMBS Rambus Inc. 1.55% 462,100 $42.5M Reduce -9.0%
SKYW Skywest Inc. 1.40% 382,220 $38.4M Add +15.6%
EHC Encompass Health Corp. 1.39% 358,971 $38.1M Add +0.1%
SITM Sitime Corp. 1.37% 106,396 $37.6M No change
DOCN Digitalocean Holdings Inc. 1.37% 778,830 $37.5M Add +0.9%
NVMI Nova Ltd. 1.36% 113,285 $37.2M No change
FTDR Frontdoor Inc. 1.29% 610,860 $35.2M No change
BTSG Brightspring Health Services 1.24% 908,000 $34.0M No change
MTSI Macom Technology Solutions H 1.12% 178,960 $30.7M Add +0.7%
VCYT Veracyte Inc. 1.12% 726,740 $30.6M Add +0.7%
MRCY Mercury Systems Inc. 1.11% 414,040 $30.2M Add +3.9%
FLS Flowserve Corp. 1.04% 409,941 $28.4M Add +0.2%
LTH Life Time Group Holdings Inc. 1.03% 1,059,300 $28.2M Add +22.3%
WAY Waystar Holding Corp. 1.01% 840,600 $27.5M Add +0.5%
RSI Rush Street Interactive Inc. 1.00% 1,411,710 $27.4M Add +18.5%
CLH Clean Harbors Inc. 1.00% 116,870 $27.4M Add +0.1%
CRS Carpenter Technology 0.95% 82,611 $26.0M No change
TPC Tutor Perini Corp. 0.95% 387,200 $26.0M Add +2.5%
OSIS Osi Systems Inc. 0.95% 101,400 $25.9M No change
WGS Genedx Holdings Corp. 0.95% 198,770 $25.9M Add +2.5%
PEGA Pegasystems Inc. 0.93% 424,840 $25.4M Add +9.1%
FRSH Freshworks Inc. Class A 0.92% 2,054,470 $25.2M Reduce -0.2%
BROS Dutch Bros Inc. Class A 0.91% 404,500 $24.8M No change
G Genpact Ltd. 0.89% 521,602 $24.4M Add +0.9%
QTWO Q2 Holdings Inc. filed as Q2 HLDGS INC 0.89% 336,860 $24.3M Add +15.3%
IMAX Imax Corp. 0.88% 652,300 $24.1M Add +12.5%
AMSC American Superconductor Corp. 0.88% 835,900 $24.1M Add +25.6%
ICUI Icu Medical Inc. 0.88% 168,040 $24.0M Add +12.7%
MMSI Merit Medical Systems Inc. 0.87% 268,760 $23.7M Add +15.8%
GMED Globus Medical Inc. Class A 0.86% 270,000 $23.6M New
ACA Arcosa Inc. 0.86% 221,600 $23.6M No change
ARQT Arcutis Biotherapeutics Inc. 0.86% 808,400 $23.5M New
CAMT Camtek Ltd. 0.85% 218,880 $23.3M Add +2.5%
LSCC Lattice Semiconductor Corp. 0.85% 314,636 $23.2M Add +14.2%
AIR Aar Corp. 0.83% 272,700 $22.6M Add +15.3%
ECG Everus Construction Group 0.81% 259,800 $22.2M No change
SIMO Silicon Motion Technol-ADR 0.80% 236,300 $21.9M Add +2.5%
URBN Urban Outfitters Inc. 0.79% 286,400 $21.6M Add +22.2%
AEO American Eagle Outfitters 0.79% 814,500 $21.5M Add +68.3%
IRTC Irhythm Holdings Inc. 0.78% 119,700 $21.2M Add +47.4%
ATEC Alphatec Holdings Inc. 0.77% 1,000,400 $21.0M Add +117.0%
NYT New York Times Co. Class A 0.77% 302,700 $21.0M Add +20.1%
FCFS Firstcash Holdings Inc. 0.77% 131,300 $20.9M Add +34.3%
LEVI Levi Strauss & Co. Class A 0.75% 993,900 $20.6M Add +10.0%
PRIM Primoris Services Corp. 0.74% 163,300 $20.3M Reduce -15.1%
EYE National Vision Holdings Inc. 0.74% 784,500 $20.3M Add +31.9%
AIZ Assurant Inc. 0.73% 83,000 $20.0M No change
CARG Cargurus Inc. 0.73% 518,400 $19.9M No change
BOX Box Inc. Class A 0.71% 652,320 $19.5M No change
DAN Dana Inc. 0.69% 796,500 $18.9M New
PI Impinj Inc. 0.68% 107,120 $18.6M No change
FSS Federal Signal Corp. 0.66% 166,500 $18.1M No change
BLBD Blue Bird Corp. 0.66% 382,638 $18.0M Add +2.5%
SXT Sensient Technologies Corp. 0.65% 188,000 $17.7M Add +40.1%
GENI Genius Sports Ltd. 0.64% 1,585,900 $17.5M Add +56.2%
VISN Vistance Networks Inc. filed as COMMSCOPE HLDG CO INC 0.64% 960,912 $17.4M Add +21.5%
SEI Solaris Energy Infrastructur 0.62% 366,900 $16.9M No change
LOPE Grand Canyon Education Inc. 0.61% 99,800 $16.6M No change
UCTT Ultra Clean Holdings Inc. 0.58% 628,500 $15.9M Add +2.5%
ACIW Aci Worldwide Inc. 0.58% 330,702 $15.8M No change
CNR Core Natural Resources Inc. 0.58% 178,400 $15.8M New
LFUS Littelfuse Inc. 0.58% 62,300 $15.8M No change
ZETA Zeta Global Holdings Corp. Class A 0.57% 767,020 $15.6M Add +0.8%
POWL Powell Industries Inc. 0.57% 48,700 $15.5M Add +2.5%
SPXC SPX Technologies Inc. 0.56% 76,900 $15.4M No change
INDV Indivior Ltd. 0.56% 424,941 $15.2M New
SGHC Super Group SGHC Ltd. 0.55% 1,268,500 $15.2M New
ANIP Ani Pharmaceuticals Inc. 0.55% 188,830 $14.9M Add +36.0%
ALHC Alignment Healthcare Inc. 0.54% 747,500 $14.8M New
QLYS Qualys Inc. 0.52% 107,800 $14.3M Add +28.3%
MIR Mirion Technologies Inc. 0.52% 607,800 $14.2M New
CVLT Commvault Systems Inc. 0.51% 110,900 $13.9M Reduce -13.8%
RELY Remitly Global Inc. 0.51% 1,002,800 $13.8M No change
CPRX Catalyst Pharmaceuticals Inc. 0.50% 586,970 $13.7M Add +11.1%
LASR Nlight Inc. 0.49% 356,400 $13.4M Add +34.0%
LIVN Livanova PLC 0.48% 212,300 $13.1M Add +14.1%
DAVE Dave Inc. 0.48% 58,922 $13.0M Add +29.1%
HQY Healthequity Inc. 0.47% 141,580 $13.0M Add +1.1%
CALX Calix Inc. 0.47% 244,600 $12.9M New
KNSA Kiniksa Pharmaceuticals Inte 0.47% 312,800 $12.9M Add +2.5%
COCO The Vita Coco Co. Inc. 0.45% 233,400 $12.4M Add +2.2%
ZWS Zurn Elkay Water Solutions C 0.45% 266,000 $12.4M No change
EZPW Ezcorp Inc. Class A 0.45% 627,900 $12.2M Reduce -8.4%
TILE Interface Inc. 0.44% 435,800 $12.2M Add +2.5%
SKWD Skyward Specialty Insurance 0.44% 237,500 $12.1M Add +2.5%
ADPT Adaptive Biotechnologies 0.44% 744,500 $12.1M Add +2.5%
MD Pediatrix Medical Group Inc. 0.44% 559,987 $12.0M Add +2.6%
ABCB Ameris Bancorp 0.42% 156,400 $11.6M No change
FN Fabrinet 0.42% 25,200 $11.5M Reduce -45.1%
LQDA Liquidia Corp. 0.42% 329,200 $11.4M Add +2.5%
TPB Turning Point Brands Inc. 0.41% 103,500 $11.2M Add +2.5%
AXGN Axogen Inc. 0.40% 336,200 $11.0M Add +2.5%
WK Workiva Inc. 0.40% 127,500 $11.0M New
MTDR Matador Resources Co. 0.39% 253,900 $10.8M No change
AGX Argan Inc. 0.38% 32,971 $10.3M Reduce -45.6%

Show all 178 holdings

Other holdings (1): bonds, preferreds, convertibles and warrants · $273K (not counted above)
SecurityClassShares / PrincipalValueChange
WELLS FARGO & COMPANY (WFC 7.5 PERP L) PERP PFD CNV A 225$273KNew

Total filed on the 13F, all lines: $2.7B.

Portfolio Sells Q3 2025 → Q4 2025
ADMA Adma Biologics Inc. Sold out 0.00% −1.52
SRAD Sportradar Group AG-A Sold out 0.00% −1.42
ITRI Itron Inc. Sold out 0.00% −1.36
LRN Stride Inc. Sold out 0.00% −1.04
QRVO Qorvo Inc. Sold out 0.00% −0.91
PSN Parsons Corp. Sold out 0.00% −0.87
SFM Sprouts Farmers Market Inc. Sold out 0.00% −0.61
BMI Badger Meter Inc. Sold out 0.00% −0.50
RMBS Rambus Inc. Reduce -9.0% 1.55% −0.47
CVLT Commvault Systems Inc. Reduce -13.8% 0.51% −0.42
CBSH Commerce Bancshares Inc. Sold out 0.00% −0.40
OSPN Onespan Inc. Sold out 0.00% −0.39
VRNS Varonis Systems Inc. Sold out 0.00% −0.39
FIVN FIVE9 Inc. Sold out 0.00% −0.37
NGVC Natural Grocers BY Vitamin C Sold out 0.00% −0.34
EXLS Exlservice Holdings Inc. Sold out 0.00% −0.33
LMB Limbach Holdings Inc. Sold out 0.00% −0.31
CLBT Cellebrite Di Ltd. Sold out 0.00% −0.29
AOSL Alpha & Omega Semiconductor Sold out 0.00% −0.29
PRIM Primoris Services Corp. Reduce -15.1% 0.74% −0.27
AGX Argan Inc. Reduce -45.6% 0.38% −0.25
FN Fabrinet Reduce -45.1% 0.42% −0.22
IIIN Insteel Industries Inc. Sold out 0.00% −0.19
DIOD Diodes Inc. Reduce -30.5% 0.27% −0.17
AVPT Avepoint Inc. Sold out 0.00% −0.17
AEIS Advanced Energy Industries Reduce -43.0% 0.30% −0.15
GDOT Green Dot Corp. Class A Reduce -21.2% 0.36% −0.14
IDCC Interdigital Inc. Reduce -17.0% 0.33% −0.12
SE Sea Ltd.-ADR Sold out 0.00% −0.12
CDNS Cadence Design SYS Inc. Sold out 0.00% −0.10
SPOT Spotify Technology SA Sold out 0.00% −0.07
VSEC Vse Corp. Reduce -25.1% 0.21% −0.07
EZPW Ezcorp Inc. Class A Reduce -8.4% 0.45% −0.05
PDD PDD Holdings Inc. Sold out 0.00% −0.04
HSAI Hesai Group Sold out 0.00% −0.03
ARIS WATER SOLUTIONS INC-A Sold out 0.00% −0.02
FRSH Freshworks Inc. Class A Reduce -0.2% 0.92% −0.01
SPY SS SPDR S&P 500 ETF Trust-US Reduce -5.4% 0.05% −0.00
JPM JPMorgan Chase & Co. Reduce -2.2% 0.04% −0.00
TRV The Travelers Cos Inc. Reduce -5.3% 0.02% −0.00
MA Mastercard Inc. Class A Reduce -1.3% 0.01% −0.00
WMT Walmart Inc. Reduce -7.2% 0.01% −0.00
BNY Bank of New York Mellon Corp. Reduce -2.1% 0.01% 0.00
NEM Newmont Corp. Reduce -9.4% 0.01% +0.00
LITE Lumentum Holdings Inc. Reduce -14.5% 3.79% +1.74

Portfolio Buys Q3 2025 → Q4 2025
GMED Globus Medical Inc. Class A New 0.86% +0.86
ARQT Arcutis Biotherapeutics Inc. New 0.86% +0.86
AAOI Applied Optoelectronics Inc. Add +8.0% 2.60% +0.73
DAN Dana Inc. New 0.69% +0.69
CNR Core Natural Resources Inc. New 0.58% +0.58
INDV Indivior Ltd. New 0.56% +0.56
SGHC Super Group SGHC Ltd. New 0.55% +0.55
ALHC Alignment Healthcare Inc. New 0.54% +0.54
MIR Mirion Technologies Inc. New 0.52% +0.52
ATEC Alphatec Holdings Inc. Add +117.0% 0.77% +0.51
CALX Calix Inc. New 0.47% +0.47
AEO American Eagle Outfitters Add +68.3% 0.79% +0.47
WK Workiva Inc. New 0.40% +0.40
DOCN Digitalocean Holdings Inc. Add +0.9% 1.37% +0.36
PLUS Eplus Inc. New 0.36% +0.36
VIAV Viavi Solutions Inc. New 0.33% +0.33
PUMP Propetro Holding Corp. New 0.33% +0.33
BHE Benchmark Electronics Inc. New 0.31% +0.31
PAHC Phibro Animal Health Corp. Class A New 0.29% +0.29
MTSI Macom Technology Solutions H Add +0.7% 1.12% +0.27
FSLY Fastly Inc. Class A New 0.26% +0.26
SN Sharkninja Inc. Add +9.0% 2.15% +0.25
IRTC Irhythm Holdings Inc. Add +47.4% 0.78% +0.24
NYT New York Times Co. Class A Add +20.1% 0.77% +0.21
TCMD Tactile Systems Technology I New 0.21% +0.21
FLS Flowserve Corp. Add +0.2% 1.04% +0.21
ICUI Icu Medical Inc. Add +12.7% 0.88% +0.19
LASR Nlight Inc. Add +34.0% 0.49% +0.19
AXGN Axogen Inc. Add +2.5% 0.40% +0.18
FCFS Firstcash Holdings Inc. Add +34.3% 0.77% +0.17
VCYT Veracyte Inc. Add +0.7% 1.12% +0.17
VISN Vistance Networks Inc. Add +21.5% 0.64% +0.17
SXT Sensient Technologies Corp. Add +40.1% 0.65% +0.16
GENI Genius Sports Ltd. Add +56.2% 0.64% +0.16
IMAX Imax Corp. Add +12.5% 0.88% +0.15
URBN Urban Outfitters Inc. Add +22.2% 0.79% +0.15
WGS Genedx Holdings Corp. Add +2.5% 0.95% +0.15
CECO Ceco Environmental Corp. Add +58.1% 0.32% +0.14
LQDA Liquidia Corp. Add +2.5% 0.42% +0.14
SKYW Skywest Inc. Add +15.6% 1.40% +0.13
DAVE Dave Inc. Add +29.1% 0.48% +0.13
MMSI Merit Medical Systems Inc. Add +15.8% 0.87% +0.13
LTH Life Time Group Holdings Inc. Add +22.3% 1.03% +0.11
ATRC Atricure Inc. Add +42.0% 0.32% +0.11
ETON Eton Pharmaceuticals Inc. Add +124.2% 0.27% +0.11
LIVN Livanova PLC Add +14.1% 0.48% +0.10
CPRX Catalyst Pharmaceuticals Inc. Add +11.1% 0.50% +0.10
QLYS Qualys Inc. Add +28.3% 0.52% +0.10
MD Pediatrix Medical Group Inc. Add +2.6% 0.44% +0.09
COCO The Vita Coco Co. Inc. Add +2.2% 0.45% +0.08

Notes & Other Activity Q3 2025 → Q4 2025
WELLS FARGO & COMPANY (WFC 7.5 PERP L) PERP PFD CNV A New 225 $273K

Bonds, preferreds, convertibles and warrants; not part of the stock holdings or percentages above.

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