PECONIC PARTNERS LLC

PECONIC PARTNERS LLC declares $4.9B in 3 of the 230 AI and semiconductor companies tracked on Silicon Floor, as of Jun 30, 2026 (Form 13F): 61.3% of its $8.0B 13F portfolio. Largest positions: Quanta Services (3.1% of the company) and MasTec (4.6% of the company). Over time: $4.9B in 3 of these companies for Q2 2026, against $293.7M in 17 for Q4 2019 (13F values as filed). From Mar 31, 2026 to Jun 30, 2026, it bought $41.6M and sold $405.2M of these stocks, at the quarter's prices: a net sale of $363.6M; 1 sold out.

Performance of its AI picks

The AI-stock portfolio PECONIC PARTNERS LLC declared for Q2 2026 (Form 13F), held unchanged, returned -22.5% in Q3 2026 (SMH -7.1%). Over the last 12 months, quarter after quarter: +34.8% (SMH +87.2%). Over three years, quarter after quarter: +197.9% (SMH +325.8%). Over five years, quarter after quarter: +358.7% (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. Quanta Services (PWR): $3.4B, 4.7M shares, 3.1% of the company, 42.3% of its portfolio (trimmed this quarter); held since Q4 2019 or earlier
2. MasTec (MTZ): $1.5B, 3.7M shares, 4.6% of the company, 19.0% of its portfolio (added this quarter); held since Q3 2025
3. Alphabet (GOOGL): $643,266.00, 1,800 shares, 0.00% of the company, 0.01% of its portfolio; held since Q2 2025

By sector

• Power, electrical & cooling: $4.9B, 100% of its AI holdings, 2 companies
• Cloud & AI giants: $643,266.00, 0% of its AI holdings, 1 company

Biggest changes this quarter

• trimmed Quanta Services (PWR): -$206.6M at the quarter's price
• sold out of Amazon (AMZN): -$198.6M at the quarter's price
• added to MasTec (MTZ): +$41.6M at the quarter's price

Other holders of this size

• Aspex Management (HK) Ltd: $4.9B in 7 of these companies
• DAVENPORT & Co LLC: $5.0B in 111 of these companies
• Rakuten Investment Management, Inc.: $4.9B in 77 of these companies
• VAN LANSCHOT KEMPEN INVESTMENT MANAGEMENT N.V.: $5.0B in 45 of these companies
• Impax Asset Management Group plc: $4.9B in 53 of these companies
• EARNEST PARTNERS LLC: $5.1B in 53 of these companies
• Railway Pension Investments Ltd: $4.9B in 34 of these companies
• SATURNA CAPITAL CORP: $5.1B in 43 of these companies

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