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Story summary
- By 2030, the S&P 500's $1 trillion club could expand from nine to 18 companies.
- Nvidia and Apple lead with market caps over $4 trillion, followed by Alphabet and Microsoft.
- Eli Lilly, Walmart, and JPMorgan Chase are near the milestone, while AI and cloud bets could drive growth or trigger sell-offs.
- Concentration risk remains because top-heavy funds may amplify volatility.
