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Oberweis Asset Management Inc.

CIK 937886 · latest 13F filed 14 August 2026 · Read the filing on EDGAR

Oberweis Asset Management Inc. reported 176 US-listed holdings worth $4.84 billion in its 13F for the quarter ended 30 June 2026, filed 14 August 2026. Its largest: Credo Technology Group Holdi (5.7%), Applied Optoelectronics Inc. (5.5%) and DigitalOcean Holdings, Inc. (3.0%). Against the quarter before, it opened 23 positions, added to 107, trimmed 27 and sold out of 27.

Reported holdings$4.84B+42.9% on Q1 2026
Positions176-4 on Q1 2026
The largest ten26.6%of its reported holdings
Latest 13FQ2 2026filed 14 August 2026
Where the money is
Added toTrimmed
CRDO5.7%AAOI5.5%DOCN3.0%SIMO2.2%UCTT1.9%SN1.9%SITM1.8%BTSG1.7%HNGE1.5%RMBS1.4%MTSI1.4%LITE1.3%LSCC1.2%NVMI1.2%161 more68.2%

The 14 largest of its 175 positions, each sized by its share of the reported holdings, coloured by the change in shares against Q1 2026.

Reported holdings, quarter by quarter
Q3 2024: $1.95 billion in 206 positions$1.95BQ3 24Q4 2024: $2.12 billion in 196 positions$2.12BQ4 24Q1 2025: $2.01 billion in 192 positions$2.01BQ1 25Q2 2025: $2.30 billion in 185 positions$2.30BQ2 25Q3 2025: $2.61 billion in 183 positions$2.61BQ3 25Q4 2025: $2.73 billion in 179 positions$2.73BQ4 25Q1 2026: $3.39 billion in 180 positions$3.39BQ1 26Q2 2026: $4.84 billion in 176 positions$4.84BQ2 26

What the fund reported holding at each quarter's end; hover a bar for the number of positions

What it did on the quarter

Opened 23Added 107Held 19Trimmed 27Sold out 27
Opened: 23Added: 107Held: 19Trimmed: 27Sold out: 27

Its positions against its 13F for the quarter to 31 March 2026; a change under 0.1% of a position counts as held

Opened 23

  1. Maxlinear, Inc. MXL$40.9 million
  2. Novanta Inc. NOVT$39.6 million
  3. Billiontoone Inc. BLLN$35.9 million
  4. Element Solutions Inc. ESI$35.3 million
  5. Ouster Inc. OUST$34.1 million
  6. Cognex Corp. CGNX$31.0 million
  7. Granite Construction Inc. GVA$30.5 million
  8. PDF Solutions Inc. PDFS$30.2 million

and 15 more in the table below

Added to 107

  1. Powell Industries Inc. POWL+145,364 shares · +426%
  2. Hinge Health Inc. HNGE+389,710 shares · +84%
  3. Diodes Inc. /Del DIOD+189,450 shares · +84%
  4. Ceco Environmental Corp. Com CECO+223,040 shares · +165%
  5. Moog Inc. MOGA+41,825 shares · +93%
  6. LivaNova plc LIVN+178,250 shares · +55%
  7. Envista Holdings Corp. NVST+455,382 shares · +68%
  8. VSE Corp. VSEC+52,090 shares · +153%

and 99 more in the table below

Trimmed 27

  1. Lumentum Holdings Inc. LITE-194,037 shares · -73%
  2. Applied Optoelectronics Inc. AAOI-558,842 shares · -24%
  3. Nova Ltd NVMI-29,280 shares · -21%
  4. Catalyst Pharmaceuticals Inc. CPRX-486,900 shares · -62%
  5. Macom Technology Solutions Holdings, Inc. MTSI-36,530 shares · -17%
  6. Imax Corp. IMAX-250,600 shares · -43%
  7. Argan Inc. AGX-12,202 shares · -37%
  8. Dana Inc. DAN-293,200 shares · -18%

and 19 more in the table below

Sold out of 27

  1. Flowserve Corp. FLS$32.0 million last quarter
  2. Primoris Services Corp. PRIM$23.8 million last quarter
  3. Genpact Ltd. G$22.6 million last quarter
  4. Alphatec Hldgs Inc. ATEC$20.8 million last quarter
  5. National Vision Holdings, Inc. EYE$20.7 million last quarter
  6. Pegasystems Inc. PEGA$19.4 million last quarter
  7. American Eagle Outfitters Inc. AEO$17.4 million last quarter
  8. Genedx Holdings Corp. WGS$16.8 million last quarter

What it holds

CompanySharesValueOf its bookChange in shares
Credo Technology Group Holdi CRDO1,013,428$275.6 million5.69%-8,540
Applied Optoelectronics Inc. AAOI1,791,127$265.4 million5.48%-558,842
DigitalOcean Holdings, Inc. DOCN930,005$146.0 million3.02%+2,500
Silicon Motion Technology Corporation SIMO316,350$105.4 million2.18%+33,800
Ultra Clean Holdings, Inc. UCTT647,276$92.3 million1.91%+6,800
SharkNinja, Inc. SN593,500$90.4 million1.87%-6,470
Sitime Corp. SITM119,501$89.1 million1.84%+220
BrightSpring Health Services, Inc. BTSG1,185,280$82.7 million1.71%+26,310
Hinge Health Inc. HNGE855,476$71.0 million1.47%+389,710
Rambus Inc. RMBS527,016$70.0 million1.45%+700
Macom Technology Solutions Holdings, Inc. MTSI179,356$68.2 million1.41%-36,530
Lumentum Holdings Inc. LITE72,185$61.9 million1.28%-194,037
Lattice Semiconductor Corp. LSCC391,816$59.9 million1.24%+17,380
Nova Ltd NVMI108,675$59.0 million1.22%-29,280
Carpenter Technology Corp. CRS93,273$57.5 million1.19%-1,160
Frontdoor, Inc. FTDR719,060$55.8 million1.15%+1,100
Everus Construction Group, Inc. ECG328,183$54.5 million1.13%+1,650
Veracyte, Inc. VCYT877,734$51.5 million1.07%+37,900
Powell Industries Inc. POWL179,521$51.4 million1.06%+145,364
Life Time Group Holdings, Inc. LTH1,189,620$48.6 million1.00%+29,120
Rush Street Interactive, Inc. RSI1,627,930$48.4 million1.00%+193,370
Mercury Systems Inc. MRCY392,723$48.0 million0.99%+1,700
Dutch Bros Inc. BROS656,093$47.1 million0.97%+57,600
Clean Harbors Inc. CLH153,475$45.9 million0.95%+9,120
Solaris Energy Infrastructure, Inc. SEI564,581$45.4 million0.94%+32,692
Diodes Inc. /Del DIOD413,750$45.3 million0.94%+189,450
Arcosa, Inc. ACA295,450$42.9 million0.89%+27,750
Blue Bird Corp. BLBD529,838$41.8 million0.86%+140,600
Camtek Ltd CAMT253,380$41.3 million0.85%+30,600
LivaNova plc LIVN500,150$41.1 million0.85%+178,250
American Superconductor Corp. AMSC987,500$41.0 million0.85%+137,600
Maxlinear, Inc. MXL319,500$40.9 million0.85%new
Globus Medical Inc. GMED512,100$40.5 million0.84%+119,900
Novanta Inc. NOVT244,260$39.6 million0.82%new
Skywest Inc. SKYW383,799$38.1 million0.79%-8,700
Viavi Solutions Inc. VIAV793,600$37.9 million0.78%+200,400
Moog Inc. MOGA86,735$36.8 million0.76%+41,825
Littelfuse Inc. LFUS79,800$36.3 million0.75%+8,000
Arcutis Biotherapeutics Inc. ARQT1,372,941$36.0 million0.74%+7,000
FirstCash Holdings, Inc. FCFS166,105$35.9 million0.74%+440
Billiontoone Inc. BLLN299,030$35.9 million0.74%new
Dana Inc. DAN1,318,300$35.9 million0.74%-293,200
Element Solutions Inc. ESI740,100$35.3 million0.73%new
AAR Corp. AIR246,325$35.2 million0.73%+1,200
Remitly Global, Inc. RELY1,570,400$35.2 million0.73%+116,100
ICU Medical Inc. ICUI237,050$34.8 million0.72%+33,340
Federal Signal Corp. FSS269,084$34.6 million0.71%+1,450
Ouster Inc. OUST545,810$34.1 million0.71%new
Levi Strauss & Co. New LEVI1,358,100$33.7 million0.70%+190,800
Merit Medical Systems Inc. MMSI473,409$32.8 million0.68%+49,200
Assurant, Inc. AIZ122,100$32.8 million0.68%+19,800
Waystar Holding Corp. WAY1,589,364$32.6 million0.67%+421,890
Ceco Environmental Corp. Com CECO358,072$32.5 million0.67%+223,040
Liquidia Corp. LQDA406,400$32.4 million0.67%+34,300
Encompass Health Corp. EHC316,886$32.0 million0.66%+27,401
Indivior Pharmaceuticals, Inc. INDV779,188$32.0 million0.66%+125,775
Cognex Corp. CGNX427,820$31.0 million0.64%new
Granite Construction Inc. GVA193,090$30.5 million0.63%new
PDF Solutions Inc. PDFS426,400$30.2 million0.62%new
Envista Holdings Corp. NVST1,120,782$29.5 million0.61%+455,382
Dave Inc. DAVE78,902$29.4 million0.61%+12,200
Ambarella Inc. AMBA342,254$29.4 million0.61%+47,069
Nlight Inc. LASR413,310$28.8 million0.59%+50,300
MYR Group Inc. MYRG54,190$27.1 million0.56%new
Adaptive Biotechnologies Corporation ADPT1,258,751$27.0 million0.56%+451,800
Leonardo DRS Inc. DRS628,486$26.8 million0.55%+178,986
Tutor Perini Corp. TPC323,200$26.8 million0.55%-70,700
Kodiak Gas Services, Inc. KGS355,870$26.7 million0.55%new
Kiniksa Pharmaceuticals Intl KNSA413,034$26.4 million0.55%+94,400
Chime Finl Inc CHYM1,268,330$26.0 million0.54%+232,800
Alignment Healthcare, Inc. ALHC1,089,600$25.9 million0.54%+123,000
Halozyme Therapeutics, Inc. HALO321,030$25.1 million0.52%+101,100
Irhythm Technologies Inc. IRTC202,004$24.0 million0.50%+46,000
Ameris Bancorp ABCB264,600$23.9 million0.49%+1,100
Zurn Elkay Water Solutions Corp. ZWS468,453$23.7 million0.49%+116,270
OSI Systems Inc. OSIS107,143$23.4 million0.48%+550
Omada Health Inc. OMDA1,048,800$23.0 million0.48%new
Urban Outfitters Inc. URBN316,192$22.4 million0.46%+1,400
ANI Pharmaceuticals Inc. ANIP265,306$22.0 million0.45%+43,920
Ezcorp Inc. EZPW631,800$21.8 million0.45%-7,600
Core Natural Resources, Inc. CNR271,170$21.7 million0.45%+1,370
Ducommun Inc. Del DCO113,800$21.1 million0.44%+13,900
Skyward Specialty Ins Group SKWD359,100$21.0 million0.43%+32,000
Willdan Group Inc. WLDN262,700$20.8 million0.43%new
A10 Networks, Inc. ATEN552,000$20.6 million0.43%+47,700
Healthequity, Inc. HQY228,291$20.6 million0.43%+61,650
Super Group Sghc Limited SGHC1,521,000$20.6 million0.43%+6,600
SPX Technologies, Inc. SPXC83,811$20.5 million0.42%+370
Formfactor Inc. FORM127,330$20.4 million0.42%new
Watts Water Technologies Inc. WTS50,840$19.9 million0.41%new
Openlane, Inc. OPLN480,580$19.8 million0.41%new
Q2 Holdings, Inc. QTWO410,409$19.7 million0.41%+15,780
Box Inc. BOX743,000$19.7 million0.41%-28,520
VSE Corp. VSEC86,098$19.7 million0.41%+52,090
Benchmark Electronics Inc. BHE198,300$19.6 million0.40%-3,600
New York Times Co. NYT277,050$19.4 million0.40%+65,400
Advanced Energy Industries Inc. AEIS49,423$18.4 million0.38%+240
Eton Pharmaceuticals Inc. ETON501,600$18.2 million0.38%+62,300
Axogen Inc. AXGN388,194$17.9 million0.37%+45,800
Fabrinet FN30,373$17.1 million0.35%+110
Argan Inc. AGX21,120$16.9 million0.35%-12,202
Commscope Hldg Co. Inc. VISN1,298,612$16.6 million0.34%+206,600
Trimas Corp. TRS362,000$16.3 million0.34%new
Zeta Global Holdings Corp. ZETA819,770$16.1 million0.33%-51,290
Seacoast Banking Corp. of Florida SBCF477,866$15.9 million0.33%+99,000
Interface Inc. TILE443,200$15.9 million0.33%-700
Pediatrix Medical Group, Inc. MD623,087$15.8 million0.33%-78,000
Propetro Hldg Corp. PUMP1,097,100$15.7 million0.33%+131,600
Fastly Inc. A FSLY852,322$15.6 million0.32%-218,700
Matador Resources Co. MTDR314,200$15.6 million0.32%+1,500
Onespaworld Holdings Ltd. OSW552,990$15.6 million0.32%+67,300
Lemaitre Vascular Inc. LMAT158,502$15.2 million0.31%+9,901
Calix, Inc. CALX402,230$15.0 million0.31%+67,200
Arlo Technologies, Inc. ARLO1,093,300$14.7 million0.30%+111,000
Innodata Inc. INOD189,200$14.3 million0.30%new
Magnite Inc. MGNI735,000$14.0 million0.29%+87,400
Nicolet Bankshares Inc. NIC83,200$13.8 million0.28%+8,400
M/I Homes, Inc. MHO83,400$13.4 million0.28%+7,000
Grand Canyon Education, Inc. LOPE92,530$13.2 million0.27%-24,370
Imax Corp. IMAX326,539$13.0 million0.27%-250,600
Eplus Inc. PLUS150,998$12.6 million0.26%+13,500
Knowles Corp. KN293,110$12.2 million0.25%+58,910
InterDigital, Inc. IDCC42,935$12.2 million0.25%+290
Boot Barn Holdings, Inc. BOOT73,200$12.0 million0.25%+5,000
Lindblad Expeditions Hldgs I LIND420,721$11.9 million0.25%+42,000
Magnolia Oil & Gas Corp. MGY456,466$11.7 million0.24%+2,000
V2X, Inc. VVX147,370$11.0 million0.23%new
Evolv Technologies Hldngs in EVLV1,823,949$10.6 million0.22%+152,000
Cormedix Inc. CRMD1,323,915$10.4 million0.21%+112,800
Gorman Rupp Co. GRC108,600$10.0 million0.21%+13,600
FB Financial Corp. FBK177,100$9.8 million0.20%+15,000
Phibro Animal Health Corp. PAHC311,100$9.8 million0.20%+34,000
Newpark Res Inc. NPKI587,550$9.3 million0.19%+69,400
American Pub Ed Inc. APEI172,400$9.3 million0.19%+42,000
Catalyst Pharmaceuticals Inc. CPRX293,670$9.2 million0.19%-486,900
Addus HomeCare Corp. ADUS89,916$9.0 million0.19%+520
Babcock &amp Wilcox Enterprises BW627,900$8.9 million0.18%+127,700
Radware Ltd RDWR286,200$8.8 million0.18%-500
Amprius Technologies Inc. AMPX636,200$8.8 million0.18%+51,200
Precision Drilling Corp. PDS110,800$8.5 million0.18%-1,800
Kforce Inc. KFRC176,200$8.3 million0.17%new
1ST Source Corp. SRCE93,800$7.7 million0.16%+7,600
PC Connection Inc. CNXN104,300$7.6 million0.16%+8,100
Fluent Inc RDVT119,000$7.6 million0.16%+14,300
Bioventus Inc. BVS709,714$6.7 million0.14%+81,600
Expro Ltd Ord SHS XPRO452,000$6.7 million0.14%new
Chefs' Warehouse, Inc. CHEF57,544$5.5 million0.11%new
Vita Coco Company, Inc. COCO83,608$5.5 million0.11%-72,500
Rocky Brands Inc. RCKY117,700$4.9 million0.10%-300
SPDR S&P 500 SPY2,378$1.8 million0.04%+4
ACM Research, Inc. ACMR13,000$1.6 million0.03%no change
JPMorgan Chase & Co. JPM3,206$1.0 million0.02%+22
Apple Inc. AAPL3,532$1.0 million0.02%+1
Microsoft Corp. MSFT2,665$994,0980.02%no change
Micron Technology Inc. MU700$808,0030.02%no change
Alphabet Inc. GOOGL1,900$679,0740.01%no change
Freshworks Inc. FRSH57,750$584,4300.01%no change
Johnson & Johnson JNJ2,298$583,5220.01%+4
Alphabet Inc. GOOG1,620$572,3950.01%no change
Travelers Companies, Inc. TRV1,583$522,5680.01%+1
Amgen Inc. AMGN1,036$375,3340.01%no change
Bank of New York Mellon Corp. BNY2,511$363,1240.01%+1
Caterpillar Inc. CAT328$349,6270.01%-80
Mastercard Inc. MA662$339,9690.01%no change
H World Group Ltd HTHT8,000$333,7600.01%-16,000
Intel Corp. INTC2,314$323,1430.01%new
Resmed Inc. RMD1,450$282,5760.01%no change
Newmont Corp. NEM2,876$268,6290.01%+1
Wells Fargo Co. New225$260,3250.01%no change
Walmart Inc. WMT2,139$242,2240.01%+2
Aflac Inc. AFL2,000$234,5000.00%no change
McDonald's Corp. MCD856$231,4480.00%+1
Freeport-McMoRan Inc. FCX3,593$225,9450.00%+3
Merck & Co., Inc. MRK1,730$222,3050.00%no change
Eli Lilly & Co. LLY183$219,4960.00%new
Xenacare Hldgs, Inc.140,000$00.00%no change
Every US-listed position in the fund's 13F for the quarter ended 30 June 2026, by the value it reported.
Read moreChange is shares against its 13F for the quarter before; the 27 it sold out of are in the box above.