CSS LLC/IL

CSS LLC/IL declares $61.0M in 45 of the 230 AI and semiconductor companies tracked on Silicon Floor, as of Jun 30, 2026 (Form 13F): 2.4% of its $2.6B 13F portfolio. Largest positions: Western Digital (0.01% of the company) and Bloom Energy (0.01% of the company). Over time: $61.0M in 45 of these companies for Q2 2026, against $28.1M in 12 for Q4 2019 (13F values as filed). From Mar 31, 2026 to Jun 30, 2026, it bought $12.7M and sold $9.0M of these stocks, at the quarter's prices: a net purchase of $3.7M; 15 new positions and 6 sold out.

Performance of its AI picks

The AI-stock portfolio CSS LLC/IL declared for Q2 2026 (Form 13F), held unchanged, returned -9.1% in Q3 2026 (SMH -7.1%). Over the last 12 months, quarter after quarter: +78.4% (SMH +87.2%). Over three years, quarter after quarter: +301.6% (SMH +325.8%). Over five years, quarter after quarter: +346.6% (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. Western Digital (WDC) — $15.9M: 24,933 shares, 0.01% of the company, 0.62% of its portfolio (trimmed this quarter); held since Q4 2024
2. Bloom Energy (BE) — $5.2M: 17,197 shares, 0.01% of the company, 0.20% of its portfolio (added this quarter); held since Q2 2025
3. MACOM (MTSI) — $5.0M: 13,148 shares, 0.02% of the company, 0.19% of its portfolio (added this quarter); held since Q4 2025
4. Cipher Mining (CIFR) — $2.9M: 119,750 shares, 0.03% of the company, 0.11% of its portfolio (added this quarter); held since Q1 2026
5. Hewlett Packard Enterprise (HPE) — $2.1M: 47,286 shares, 0.00% of the company, 0.08% of its portfolio (trimmed this quarter); held since Q3 2023
6. Dell (DELL) — $2.1M: 4,850 shares, 0.00% of the company, 0.08% of its portfolio (trimmed this quarter); held since Q2 2022
7. Microsoft (MSFT) — $1.8M: 4,950 shares, 0.00% of the company, 0.07% of its portfolio (added this quarter); held since Q3 2025
8. Qualcomm (QCOM) — $1.5M: 8,294 shares, 0.00% of the company, 0.06% of its portfolio (added this quarter); held since Q4 2023
9. HP Inc. (HPQ) — $1.4M: 64,775 shares, 0.01% of the company, 0.06% of its portfolio (trimmed this quarter); held since Q1 2021
10. TE Connectivity (TEL) — $1.4M: 6,990 shares, 0.00% of the company, 0.05% of its portfolio (added this quarter); held since Q4 2025
11. Sandisk (SNDK) — $1.4M: 610 shares, 0.00% of the company, 0.05% of its portfolio (trimmed this quarter); held since Q3 2025
12. Adobe (ADBE) — $1.2M: 5,810 shares, 0.00% of the company, 0.05% of its portfolio (added this quarter); held since Q2 2023
13. NVIDIA (NVDA) — $1.2M: 5,946 shares, 0.00% of the company, 0.05% of its portfolio (new position this quarter)
14. Fluence (FLNC) — $1.1M: 56,090 shares, 0.03% of the company, 0.04% of its portfolio (new position this quarter)
15. Meta Platforms (META) — $1.1M: 1,905 shares, 0.00% of the company, 0.04% of its portfolio (trimmed this quarter); held since Q2 2024

By sector

• Memory & storage — $19.0M, 31% of its AI holdings, 4 companies
• Power, electrical & cooling — $10.0M, 16% of its AI holdings, 9 companies
• Interconnect — $7.4M, 12% of its AI holdings, 4 companies
• Servers & systems — $6.6M, 11% of its AI holdings, 5 companies
• Chips & compute — $5.4M, 9% of its AI holdings, 6 companies
• Neoclouds & data centers — $4.9M, 8% of its AI holdings, 6 companies
• AI software — $3.8M, 6% of its AI holdings, 7 companies
• Cloud & AI giants — $2.9M, 5% of its AI holdings, 2 companies
• Equipment & test — $593,168.00, 1% of its AI holdings, 1 company
• Optics — $493,076.00, 1% of its AI holdings, 1 company

Biggest changes this quarter

• trimmed Dell (DELL): -$2.5M at the quarter's price
• opened a position in NVIDIA (NVDA): +$1.2M at the quarter's price
• opened a position in Fluence (FLNC): +$1.1M at the quarter's price
• opened a position in Penguin Solutions (PENG): +$1.1M at the quarter's price
• opened a position in Amphenol (APH): +$871,373.00 at the quarter's price
• added to Microsoft (MSFT): +$760,961.00 at the quarter's price
• added to MACOM (MTSI): +$722,703.00 at the quarter's price
• added to Cognizant (CTSH): +$714,956.00 at the quarter's price
• opened a position in Super Micro Computer (SMCI): +$687,349.00 at the quarter's price
• sold out of Eaton (ETN): -$675,996.00 at the quarter's price

Schedule 13D/G declarations

• Wolfspeed (WOLF) — 13G filed Jun 8, 2026: 3.0M shares as of Jun 5, 2026, 5.9% as declared

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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