Archive · 9 Oct 2026
Five Charts Warn U.S. Markets May Be Stretched
Several measures suggest that U.S. stock and bond markets may be unusually stretched.
A small group of technology and AI companies now makes up a very large part of the stock market.
Many other companies are not keeping pace with the biggest firms.
Stocks also offer less extra expected return over government bonds than usual.
Meanwhile, long-term inflation-protected Treasury yields are high, and another measure of the extra return investors want for holding long-term bonds is rising.
These trends could make markets more vulnerable if investors lose confidence.
But the article says strong economic growth and profits from AI could keep stocks rising.
It is unclear whether a turning point is near.
Technology and AI-related companies account for more than half of the S&P 500’s market value, exceeding the concentration seen during the dot-com peak.
The equal-weighted S&P 500 is underperforming the market-cap-weighted index by its widest margin in 24 years.
The equity risk premium is negative and at its lowest level in 24 years, while the article says investors have shown few signs of reducing equity exposure.
The 30-year Treasury inflation-protected security yield is nearing 3.40%, its highest level since 2002.
The Treasury term premium is rising sharply, though its cause is uncertain; strong growth and AI profits could also sustain the market rally.
- Who
- Investors in U.S. stocks and bonds.
- What
- Five market indicators point to unusually stretched conditions, while possible reasons for continued gains remain.
- When
- The article describes current market conditions; it gives historical comparisons including 2000, 2002, and 24-year extremes.
- Where
- U.S. financial markets.
- Why
- High stock-market concentration, weak performance by equal-weighted stocks, a negative equity risk premium, elevated real yields, and a rising term premium are prompting caution.
Reasons for caution
Reasons the rally could continue
Market concentration and AI
Reasons for caution
Tech and AI stocks dominate the index, and a change in AI sentiment could trigger a serious correction.
Reasons the rally could continue
If large AI investments begin to pay off, the stock rally could strengthen.
High yields and market direction
Reasons for caution
Elevated real yields and a sharply rising term premium could weigh on stocks and bonds and eventually hurt corporate borrowers.
Reasons the rally could continue
The article notes that yields could rise for reasons that are not all negative, and strong economic growth may support markets.
- Technology and AI share
- Tech and AI-related companies together account for over 50% of the S&P 500’s market value.
- Equal-weight performance
- The equal-weighted S&P 500 is underperforming the market-cap-weighted index by the widest margin in 24 years.
- Equity risk premium
- It is negative and at its lowest level in 24 years.
- 30-year TIPS yield
- Near 3.40%, the highest since 2002.
- Term premium
- Rising sharply; the article says the reason remains uncertain.
- Potential support for stocks
- Strong economic growth and AI-related profits could sustain the rally.