The S&P 500 has more than doubled over the past four years (up 110%), driven largely by AI leaders such as Nvidia (up 2,320%) and Palantir (up 1,680%). The article notes that hyperscalers like Amazon and Alphabet are investing billions in AI, and both reported negative free cash flow in the second quarter. The Buffett indicator, which compares total stock market value to U.S. GDP, is currently at 297%, versus levels approaching 200% in 1999 and 2000. The article says this does not mean a crash is imminent, but investors should prepare by keeping some cash to buy stocks during downturns and by rebalancing holdings that have become too concentrated in one stock.
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S&P 500valuationNvidiaWarren Buffettartificial intelligence
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SPY
• NeutralSPDR S&P 500 ETF
Relevance: low
| Market | US stocks |
|---|---|
| Sector | ETF |
| Close on 10/21/2026 | 773.13 |
| Change that session | +0.53% |
Impact is scored by AI from the headline and may be wrong. It is not investment advice.
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