OBERWEIS ASSET MANAGEMENT INC/

OBERWEIS ASSET MANAGEMENT INC/ declares $1.8B in 35 of the 230 AI and semiconductor companies tracked on Silicon Floor, as of Jun 30, 2026 (Form 13F): 37.0% of its $4.8B 13F portfolio. Largest positions: Credo (0.54% of the company) and Applied Optoelectronics (2.1% of the company). Over time: $1.8B in 35 of these companies for Q2 2026, against $14.2M in 15 for Q4 2019 (13F values as filed). From Mar 31, 2026 to Jun 30, 2026, it bought $191.9M and sold $327.5M of these stocks, at the quarter's prices: a net sale of $135.6M; 5 new positions and 2 sold out.

Performance of its AI picks

The AI-stock portfolio OBERWEIS ASSET MANAGEMENT INC/ declared for Q2 2026 (Form 13F), held unchanged, returned -23.0% in Q3 2026 (SMH -7.1%), ranked 1768 of 1,783 active managers. Over the last 12 months, quarter after quarter: +103.6% (SMH +87.2%), ranked 26 of 1,359 active managers. Over three years, quarter after quarter: +258.0% (SMH +325.8%). Over five years, quarter after quarter: +402.7% (SMH +389.8%). Trades made during a quarter are not visible in 13F filings: this measures its declared picks, not the return of its funds.

Largest positions

1. Credo (CRDO) — $275.6M: 1.0M shares, 0.54% of the company, 5.7% of its portfolio (trimmed this quarter); held since Q1 2024
2. Applied Optoelectronics (AAOI) — $265.4M: 1.8M shares, 2.1% of the company, 5.5% of its portfolio (trimmed this quarter); held since Q3 2023
3. DigitalOcean (DOCN) — $146.0M: 930,005 shares, 0.79% of the company, 3.0% of its portfolio (added this quarter); held since Q3 2024
4. Silicon Motion (SIMO) — $105.4M: 316,350 shares, 0.94% of the company, 2.2% of its portfolio (added this quarter); held since Q4 2023
5. Ultra Clean (UCTT) — $92.3M: 647,276 shares, 1.4% of the company, 1.9% of its portfolio (added this quarter); held since Q4 2019 or earlier
6. SiTime (SITM) — $89.1M: 119,501 shares, 0.40% of the company, 1.8% of its portfolio (added this quarter); held since Q2 2025
7. Rambus (RMBS) — $70.0M: 527,016 shares, 0.49% of the company, 1.4% of its portfolio (added this quarter); held since Q4 2024
8. MACOM (MTSI) — $68.2M: 179,356 shares, 0.23% of the company, 1.4% of its portfolio (trimmed this quarter); held since Q3 2024
9. Lumentum (LITE) — $61.9M: 72,185 shares, 0.08% of the company, 1.3% of its portfolio (trimmed this quarter); held since Q2 2025
10. Lattice Semiconductor (LSCC) — $59.9M: 391,816 shares, 0.28% of the company, 1.2% of its portfolio (added this quarter); held since Q3 2025
11. Nova (NVMI) — $59.0M: 108,675 shares, 0.37% of the company, 1.2% of its portfolio (trimmed this quarter); held since Q3 2024
12. Powell Industries (POWL) — $51.4M: 179,521 shares, 0.49% of the company, 1.1% of its portfolio (added this quarter); held since Q3 2023
13. Solaris Energy Infrastructure (SEI) — $45.4M: 564,581 shares, 0.74% of the company, 0.94% of its portfolio (added this quarter); held since Q1 2025
14. Diodes (DIOD) — $45.3M: 413,750 shares, 0.90% of the company, 0.94% of its portfolio (added this quarter); held since Q2 2025
15. Camtek (CAMT) — $41.3M: 253,380 shares, 0.55% of the company, 0.85% of its portfolio (added this quarter); held since Q4 2019 or earlier

By sector

• Interconnect — $428.8M, 24% of its AI holdings, 4 companies
• Optics — $411.1M, 23% of its AI holdings, 5 companies
• Chips & compute — $264.9M, 15% of its AI holdings, 6 companies
• Equipment & test — $233.1M, 13% of its AI holdings, 6 companies
• Neoclouds & data centers — $146.0M, 8% of its AI holdings, 1 company
• Power, electrical & cooling — $134.6M, 8% of its AI holdings, 5 companies
• Memory & storage — $106.3M, 6% of its AI holdings, 2 companies
• AI software — $44.5M, 2% of its AI holdings, 2 companies
• Servers & systems — $19.6M, 1% of its AI holdings, 1 company
• Cloud & AI giants — $3.3M, 0% of its AI holdings, 3 companies

Biggest changes this quarter

• trimmed Lumentum (LITE): -$166.5M at the quarter's price
• trimmed Applied Optoelectronics (AAOI): -$82.8M at the quarter's price
• opened a position in MaxLinear (MXL): +$40.9M at the quarter's price
• opened a position in PDF Solutions (PDFS): +$30.2M at the quarter's price
• sold out of Primoris Services (PRIM): -$23.8M at the quarter's price
• added to Powell Industries (POWL): +$22.1M at the quarter's price
• added to Diodes (DIOD): +$20.7M at the quarter's price
• opened a position in FormFactor (FORM): +$20.4M at the quarter's price
• trimmed Nova (NVMI): -$15.9M at the quarter's price
• opened a position in Innodata (INOD): +$14.3M at the quarter's price

Other holders of this size

• Vanguard — $3.6T in 225 of these companies
• BlackRock — $3.1T in 226 of these companies
• State Street — $1.6T in 222 of these companies
• Fidelity (FMR) — $1.2T in 223 of these companies
• Geode Capital — $890.9B in 220 of these companies
• Capital Group — $881.7B in 132 of these companies
• JPMorgan — $717.8B in 225 of these companies
• Invesco — $683.3B in 220 of these companies

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