Robeco Schweiz AG

Robeco Schweiz AG declares $3.3B in 40 of the 230 AI and semiconductor companies tracked on Silicon Floor, as of Jun 30, 2026 (Form 13F): 53.4% of its $6.2B 13F portfolio. Largest positions: Arm Holdings (0.08% of the company) and Marvell (0.11% of the company). Over time: $3.3B in 40 of these companies for Q2 2026, against $784.3M in 24 for Q4 2019 (13F values as filed). From Mar 31, 2026 to Jun 30, 2026, it bought $210.3M and sold $307.9M of these stocks, at the quarter's prices: a net sale of $97.6M; 2 new positions and 2 sold out.

Performance of its AI picks

The AI-stock portfolio Robeco Schweiz AG declared for Q2 2026 (Form 13F), held unchanged, returned -12.8% in Q3 2026 (SMH -7.1%), ranked 1684 of 1,783 active managers. Over the last 12 months, quarter after quarter: +81.6% (SMH +87.2%), ranked 60 of 1,359 active managers. Over three years, quarter after quarter: +213.8% (SMH +325.8%), ranked 83 of 783 active managers. Over five years, quarter after quarter: +241.8% (SMH +389.8%), ranked 48 of 535 active managers. 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. Arm Holdings (ARM) — $293.4M: 827,366 shares, 0.08% of the company, 4.7% of its portfolio (trimmed this quarter); held since Q3 2023
2. Marvell (MRVL) — $286.2M: 960,706 shares, 0.11% of the company, 4.6% of its portfolio (trimmed this quarter); held since Q4 2019 or earlier
3. nVent (NVT) — $245.9M: 1.5M shares, 0.90% of the company, 3.9% of its portfolio (added this quarter); held since Q2 2023
4. Quanta Services (PWR) — $235.1M: 326,449 shares, 0.22% of the company, 3.8% of its portfolio (added this quarter); held since Q3 2022
5. Vertiv (VRT) — $213.6M: 637,920 shares, 0.17% of the company, 3.4% of its portfolio (trimmed this quarter); held since Q4 2020
6. Analog Devices (ADI) — $209.5M: 527,512 shares, 0.11% of the company, 3.4% of its portfolio (added this quarter); held since Q4 2019 or earlier
7. onsemi (ON) — $162.8M: 1.7M shares, 0.44% of the company, 2.6% of its portfolio (trimmed this quarter); held since Q4 2019 or earlier
8. Lumentum (LITE) — $158.0M: 184,110 shares, 0.21% of the company, 2.5% of its portfolio (trimmed this quarter); held since Q4 2019 or earlier
9. Generac (GNRC) — $141.0M: 481,609 shares, 0.82% of the company, 2.3% of its portfolio (added this quarter); held since Q4 2025
10. Lattice Semiconductor (LSCC) — $139.2M: 909,862 shares, 0.64% of the company, 2.2% of its portfolio (added this quarter); held since Q1 2020
11. Monolithic Power (MPWR) — $132.8M: 96,033 shares, 0.20% of the company, 2.1% of its portfolio (added this quarter); held since Q4 2019 or earlier
12. Power Integrations (POWI) — $112.3M: 1.3M shares, 2.4% of the company, 1.8% of its portfolio (added this quarter); held since Q4 2019 or earlier
13. Autodesk (ADSK) — $99.7M: 512,880 shares, 0.25% of the company, 1.6% of its portfolio (trimmed this quarter); held since Q1 2020
14. Bloom Energy (BE) — $95.8M: 316,637 shares, 0.11% of the company, 1.5% of its portfolio (added this quarter); held since Q1 2026
15. Trane (TT) — $86.4M: 175,904 shares, 0.08% of the company, 1.4% of its portfolio (added this quarter); held since Q4 2025

By sector

• Chips & compute — $1.5B, 46% of its AI holdings, 15 companies
• Power, electrical & cooling — $1.1B, 34% of its AI holdings, 9 companies
• Optics — $302.5M, 9% of its AI holdings, 4 companies
• Equipment & test — $194.6M, 6% of its AI holdings, 5 companies
• AI software — $151.6M, 5% of its AI holdings, 4 companies
• Interconnect — $26.1M, 1% of its AI holdings, 2 companies
• Servers & systems — $1.8M, 0% of its AI holdings, 1 company

Biggest changes this quarter

• trimmed Marvell (MRVL): -$72.0M at the quarter's price
• trimmed Arm Holdings (ARM): -$63.8M at the quarter's price
• added to Analog Devices (ADI): +$53.0M at the quarter's price
• added to Power Integrations (POWI): +$39.4M at the quarter's price
• trimmed Comfort Systems USA (FIX): -$39.0M at the quarter's price
• trimmed Vertiv (VRT): -$28.5M at the quarter's price
• trimmed Lumentum (LITE): -$26.4M at the quarter's price
• trimmed onsemi (ON): -$22.7M at the quarter's price
• added to SPX Technologies (SPXC): +$19.9M at the quarter's price
• opened a position in Veeco (VECO): +$17.4M at the quarter's price

Other holders of this size

• KAYNE ANDERSON RUDNICK INVESTMENT MANAGEMENT LLC — $3.3B in 110 of these companies
• Newport Trust Company, LLC — $3.3B in 5 of these companies
• Union Bancaire Privee, UBP SA — $3.3B in 79 of these companies
• REAVES W H & CO INC — $3.3B in 27 of these companies
• ExodusPoint Capital Management, LP — $3.3B in 111 of these companies
• Danica Pension, Livsforsikringsaktieselskab — $3.4B in 50 of these companies
• Artemis Investment Management LLP — $3.3B in 41 of these companies
• JOHNSON INVESTMENT COUNSEL INC — $3.4B in 88 of these companies

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