Castle Hook Partners LP

Castle Hook Partners LP declares $3.6B in 16 of the 230 AI and semiconductor companies tracked on Silicon Floor, as of Jun 30, 2026 (Form 13F): 16.5% of its $21.8B 13F portfolio. Largest positions: Western Digital (0.25% of the company) and Sandisk (0.16% of the company). Over time: $3.6B in 16 of these companies for Q2 2026, against $279.5M in 7 for Q4 2019 (13F values as filed). From Mar 31, 2026 to Jun 30, 2026, it bought $936.2M and sold $770.4M of these stocks, at the quarter's prices: a net purchase of $165.8M; 6 new positions and 1 sold out.

Performance of its AI picks

The AI-stock portfolio Castle Hook Partners LP declared for Q2 2026 (Form 13F), held unchanged, returned -17.5% in Q3 2026 (SMH -7.1%), ranked 1730 of 1,783 active managers. Over the last 12 months, quarter after quarter: +121.7% (SMH +87.2%), ranked 15 of 1,359 active managers. Over three years, quarter after quarter: +749.3% (SMH +325.8%). 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) — $577.0M: 903,374 shares, 0.25% of the company, 2.6% of its portfolio (added this quarter); held since Q2 2025
2. Sandisk (SNDK) — $540.2M: 237,578 shares, 0.16% of the company, 2.5% of its portfolio (trimmed this quarter); held since Q3 2025
3. Seagate (STX) — $527.2M: 546,287 shares, 0.24% of the company, 2.4% of its portfolio (trimmed this quarter); held since Q2 2025
4. TTM Technologies (TTMI) — $333.1M: 1.8M shares, 1.7% of the company, 1.5% of its portfolio (trimmed this quarter); held since Q4 2025
5. Amazon (AMZN) — $305.8M: 1.3M shares, 0.01% of the company, 1.4% of its portfolio (added this quarter); held since Q1 2026
6. Applied Materials (AMAT) — $290.6M: 401,956 shares, 0.05% of the company, 1.3% of its portfolio (trimmed this quarter); held since Q4 2025
7. Credo (CRDO) — $202.2M: 743,555 shares, 0.40% of the company, 0.93% of its portfolio (new position this quarter)
8. Comfort Systems USA (FIX) — $195.2M: 98,482 shares, 0.28% of the company, 0.89% of its portfolio (trimmed this quarter); held since Q3 2025
9. Intel (INTC) — $182.6M: 1.3M shares, 0.03% of the company, 0.84% of its portfolio (new position this quarter)
10. Alphabet (GOOGL) — $162.4M: 459,557 shares, 0.00% of the company, 0.74% of its portfolio (new position this quarter)
11. Analog Devices (ADI) — $133.4M: 335,984 shares, 0.07% of the company, 0.61% of its portfolio (added this quarter); held since Q4 2025
12. Equinix (EQIX) — $103.6M: 99,423 shares, 0.10% of the company, 0.48% of its portfolio (trimmed this quarter); held since Q1 2026
13. Microchip (MCHP) — $46.0M: 504,526 shares, 0.09% of the company, 0.21% of its portfolio (new position this quarter)
14. Lumentum (LITE) — $2.6M: 3,004 shares, 0.00% of the company, 0.01% of its portfolio (trimmed this quarter); held since Q3 2025
15. Coherent (COHR) — $2.1M: 5,205 shares, 0.00% of the company, 0.01% of its portfolio (new position this quarter)

By sector

• Memory & storage — $1.6B, 46% of its AI holdings, 3 companies
• Cloud & AI giants — $468.2M, 13% of its AI holdings, 2 companies
• Chips & compute — $364.0M, 10% of its AI holdings, 4 companies
• Servers & systems — $333.1M, 9% of its AI holdings, 1 company
• Equipment & test — $290.6M, 8% of its AI holdings, 1 company
• Interconnect — $202.2M, 6% of its AI holdings, 1 company
• Power, electrical & cooling — $195.2M, 5% of its AI holdings, 1 company
• Neoclouds & data centers — $103.6M, 3% of its AI holdings, 1 company
• Optics — $4.6M, 0% of its AI holdings, 2 companies

Biggest changes this quarter

• added to Amazon (AMZN): +$303.5M at the quarter's price
• trimmed Comfort Systems USA (FIX): -$218.9M at the quarter's price
• opened a position in Credo (CRDO): +$202.2M at the quarter's price
• opened a position in Intel (INTC): +$182.6M at the quarter's price
• trimmed Equinix (EQIX): -$171.5M at the quarter's price
• opened a position in Alphabet (GOOGL): +$162.4M at the quarter's price
• trimmed Lumentum (LITE): -$127.4M at the quarter's price
• trimmed Sandisk (SNDK): -$89.3M at the quarter's price
• trimmed Applied Materials (AMAT): -$85.8M at the quarter's price
• trimmed TTM Technologies (TTMI): -$62.3M at the quarter's price

Other holders of this size

• Orbis Allan Gray Ltd — $3.6B in 10 of these companies
• Walleye Capital LLC — $3.6B in 194 of these companies
• Walleye Trading LLC — $3.6B in 108 of these companies
• YOUSIF CAPITAL MANAGEMENT, LLC — $3.6B in 163 of these companies
• SRS Investment Management, LLC — $3.6B in 12 of these companies
• CANTOR FITZGERALD, L. P. — $3.7B in 45 of these companies
• Investment Management Corp of Ontario — $3.6B in 104 of these companies
• Optiver Holding B.V. — $3.7B in 102 of these companies

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