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FollowingThe S & P 500 Index hits a record high, concerns about market breadth emerge.
The S & P 500 Index rose about 0.5%, and is expected to hit its 28th all-time high in 2026, the first time since August this year. The Nasdaq index continued its strong momentum, while the Dow Jones Industrial Average rose slightly, boosted by a fall in oil and government bond yields.
What is worth noting is the divergence in market breadth. According to Morgan Stanley research data cited by Barron's, more than 70% of the S & P 500 components are still at least 10% below recent highs. This means that even if most components have not yet reached their peak, the index as a whole may still hit a record high.
Performance of large technology-dominated index
The gap between the broad market index and the average of individual stocks has widened significantly. Over the past three months, the capital-weighted S & P 500 has risen about 3.9%, while the equal-weighted version has fallen about 1.8%. The equal-weight index gives each constituent stock roughly the same influence, and its weak performance highlights the current rally's heavy reliance on a few giant technology stocks.
This concentration began to show in September, when about 78% of stocks in the S & P 500 fell despite the benchmark index being close to historical highs. The same "breadth problem" continued into October.
Another measure provided by the Market Observer: The median stock price of the S & P 500 is still about 17% below its 252-day high.
Strong AI profits offset high interest rate pressure
The technology sector and artificial intelligence are still the main sources of power for the market. Analysts expect the S & P 500's third-quarter earnings per share to increase by approximately 29.5% year-on-year, with artificial intelligence infrastructure companies contributing more than half of the growth. Only about one-third of the S & P 500 stocks have risen since mid-September.
This profit momentum allows large technology stocks to remain resilient against an unfavorable bond market backdrop. Although the yield on the 10-year Treasury bond recently exceeded 5.3%, and high interest rates usually put heavy pressure on technology stocks, the latest round of Nasdaq rebound once again confirms this pattern: strong artificial intelligence profits effectively offset high interest rates. Valuation pressure brought by.
