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OBERWEIS ASSET MANAGEMENT INC/ — 13F Holdings & Portfolio

CIK 937886 · latest 13F-HR filed 2026-08-14

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OBERWEIS ASSET MANAGEMENT INC/ manages $4.84B in 13F-reported U.S. long-equity assets across 176 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are CRDO (5.69%), AAOI (5.48%), DOCN (3.02%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 23 new positions, exited 27, added to 120, and trimmed 25.

AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.

Filer Information
Address
3333 WARRENVILLE ROAD
SUITE 500
LISLE, IL 60532
Phone
(630) 577-2300
Filing Manager
OBERWEIS ASSET MANAGEMENT INC/
LISLE, IL
Signatory
Thomas P. Joyce
Chief Compliance Officer
Loading holdings…
AUM

$4.84B

Long-equity book

Holdings

176

Distinct positions

Period

2026-06-30

Filed 2026-08-14

Q/Q Activity

+23 / −27 / ↑120 / ↓25

vs 2026-03-31

Firm Profile & Key People
Name Title / Status Ownership Type

Top Adds (vs prior quarter)

  • Credo Technology Group$179.7M +187.3%
  • Silicon Motion Techn ADR$73.7M +232.4%
  • Applied Optoelectronics Inc.$66.6M +33.5%
  • DigitalOcean Holdings, Inc.$66.5M +83.6%
  • Hinge Health, Inc.$53.0M +295.3%
Show all 120 →

Top Trims

  • Lumentum Hldgs, Inc.-$125.2M -66.9%
  • Dana Inc.-$18.4M -33.9%
  • Fastly, Inc.-$15.5M -49.7%
  • Catalyst Pharmaceuticals, Inc.-$10.1M -52.2%
  • Imax Corp.-$8.9M -40.7%
Show all 25 →

New Positions

  • Maxlinear, Inc. Class A$40.9M
  • Novanta, Inc.$39.6M
  • Billiontoone, Inc.$35.9M
  • Element Solutions, Inc.$35.3M
  • Ouster, Inc.$34.1M
Show all 23 →

Exited Positions

  • Flowserve Corporation$32.0M
  • Primoris Services Corp.$23.8M
  • Genpact Ltd.$22.6M
  • Alphatec Hldgs Inc.$20.8M
  • National Vision Holdings, Inc.$20.7M
Show all 27 →
All Holdings

Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).

# Issuer Symbol CUSIP Value Weight Shares Type
1 Credo Technology Group CRDO G25457105 $275.6M 5.69% 1,013,428 SH
2 Applied Optoelectronics Inc. AAOI 03823U102 $265.4M 5.48% 1,791,127 SH
3 DigitalOcean Holdings, Inc. DOCN 25402D102 $146.0M 3.02% 930,005 SH
4 Silicon Motion Techn ADR SIMO 82706C108 $105.4M 2.18% 316,350 SH
5 Ultra Clean Holdings UCTT 90385V107 $92.3M 1.91% 647,276 SH
6 SharkNinja, Inc. SN G8068L108 $90.4M 1.87% 593,500 SH
7 SiTime Corporation SITM 82982T106 $89.1M 1.84% 119,501 SH
8 BrightSpring Health Services BTSG 10950A106 $82.7M 1.71% 1,185,280 SH
9 Hinge Health, Inc. HNGE 433313103 $71.0M 1.47% 855,476 SH
10 Rambus, Inc RMBS 750917106 $70.0M 1.45% 527,016 SH
11 Macom Technology Solutions MTSI 55405Y100 $68.2M 1.41% 179,356 SH
12 Lumentum Hldgs, Inc. LITE 55024U109 $61.9M 1.28% 72,185 SH
13 Lattice Semiconductor Corporat LSCC 518415104 $59.9M 1.24% 391,816 SH
14 Nova Ltd. NVMI M7516K103 $59.0M 1.22% 108,675 SH
15 Carpenter Technology Corp. CRS 144285103 $57.5M 1.19% 93,273 SH
16 Frontdoor, Inc. FTDR 35905A109 $55.8M 1.15% 719,060 SH
17 Everus Construction Group ECG 300426103 $54.5M 1.13% 328,183 SH
18 Veracyte, Inc. VCYT 92337F107 $51.5M 1.07% 877,734 SH
19 Powell Industries Inc. POWL 739128106 $51.4M 1.06% 179,521 SH
20 Life Time Holdings, Inc. LTH 53190C102 $48.6M 1.00% 1,189,620 SH
21 Rush Street Interactive, Inc. RSI 782011100 $48.4M 1.00% 1,627,930 SH
22 Mercury Systems, Inc. MRCY 589378108 $48.0M 0.99% 392,723 SH
23 Dutch Bros., Inc. BROS 26701L100 $47.1M 0.97% 656,093 SH
24 Clean Harbors, Inc. CLH 184496107 $45.9M 0.95% 153,475 SH
25 Solaris Energy Infrastructur SEI 83418M103 $45.4M 0.94% 564,581 SH
26 Diodes, Inc. DIOD 254543101 $45.3M 0.94% 413,750 SH
27 Arcosa, Inc. ACA 039653100 $42.9M 0.89% 295,450 SH
28 Blue Bird Corporation BLBD 095306106 $41.8M 0.86% 529,838 SH
29 Camtek, Ltd. CAMT M20791105 $41.3M 0.85% 253,380 SH
30 LivaNova Plc LIVN G5509L101 $41.1M 0.85% 500,150 SH
31 American Superconductor AMSC 030111207 $41.0M 0.85% 987,500 SH
32 Maxlinear, Inc. Class A MXL 57776J100 $40.9M 0.85% 319,500 SH
33 Globus Medical, Inc.-A GMED 379577208 $40.5M 0.84% 512,100 SH
34 Novanta, Inc. NOVT 67000B104 $39.6M 0.82% 244,260 SH
35 Skywest Inc SKYW 830879102 $38.1M 0.79% 383,799 SH
36 Viavi Solutions, Inc. VIAV 925550105 $37.9M 0.78% 793,600 SH
37 Moog Inc. - A MOG.A 615394202 $36.8M 0.76% 86,735 SH
38 Littelfuse, Inc. LFUS 537008104 $36.3M 0.75% 79,800 SH
39 Arcutis Biotherapeutics, Inc. ARQT 03969K108 $36.0M 0.74% 1,372,941 SH
40 FirstCash Holdings, Inc FCFS 33768G107 $35.9M 0.74% 166,105 SH
41 Billiontoone, Inc. BLLN 090168105 $35.9M 0.74% 299,030 SH
42 Dana Inc. DAN 235825205 $35.9M 0.74% 1,318,300 SH
43 Element Solutions, Inc. ESI 28618M106 $35.3M 0.73% 740,100 SH
44 AAR Corp. AIR 000361105 $35.2M 0.73% 246,325 SH
45 Remitly Global, Inc. RELY 75960P104 $35.2M 0.73% 1,570,400 SH
46 ICU Medical, Inc. ICUI 44930G107 $34.8M 0.72% 237,050 SH
47 Federal Signal Corp. FSS 313855108 $34.6M 0.71% 269,084 SH
48 Ouster, Inc. OUST 68989M202 $34.1M 0.71% 545,810 SH
49 Levi Strauss & Co. LEVI 52736R102 $33.7M 0.70% 1,358,100 SH
50 Merit Medical System Inc MMSI 589889104 $32.8M 0.68% 473,409 SH
Filing History
Period Filed AUM Holdings Accession
2026-06-30 2026-08-14 $4.84B 176 0001213900-26-089777
2026-03-31 2026-05-15 $3.39B 180 0001213900-26-057307
2025-12-31 2026-02-17 $2.73B 179 0001213900-26-017101
2025-09-30 2025-11-17 $2.61B 183 0001213900-25-111225