The United States’ flagship equity index has posted fresh record closes this year, yet the rally is being carried almost entirely by a small group of artificial‑intelligence (AI) beneficiaries. Analysts say the lack of broad‑based participation could trigger a correction of 5‑10% in the coming weeks.
Tech giants shoulder the rally
Since the end of March, ten stocks—chiefly Nvidia, Apple, Microsoft, Amazon, Alphabet and Meta—have supplied roughly 70% of the S&P 500’s gains, according to a post by the market‑watching newsletter The Kobeissi Letter on X. Nvidia alone accounts for about 8.4% of the index, underscoring how a market‑cap weighted benchmark can be swayed by a single heavyweight.
Breadth of market participation wanes
While the S&P 500 and Nasdaq Composite have risen 13% and 15% respectively in 2026, about 84% of the index’s constituents sit at least 10% below their recent peaks. The same analysis showed that 97% of real‑estate stocks, and more than 90% of companies in materials, utilities, consumer discretionary and consumer staples, are lagging by the same margin. An equal‑weight version of the S&P 500, which gives each component roughly the same 0.2% weight, fell 2% in the third quarter, contrasting sharply with the market‑cap version’s gain.
Bond yields add pressure
Elevated Treasury yields are compounding the divergence. The 10‑year U.S. Treasury yield has climbed nearly 80 basis points since the summer, raising the required return for equity investors and compressing the present value of future cash flows. J.P. Morgan Private Bank notes that higher yields tend to penalise sectors that lack the cash cushions of the AI‑rich mega‑caps, such as utilities and traditional industrials.
Analysts caution on correction
Morgan Stanley’s chief investment officer, Mike Wilson, warned that the gap between price and breadth could force a 5%‑10% pull‑back if it remains unresolved. He cited a decline in the proportion of S&P 500 stocks trading above their 200‑day moving average—from roughly 75% to below 50%—as a signal that the rally’s momentum is narrowing. Similarly, Citadel Securities highlighted that the equal‑weight index has logged seven consecutive weeks of decline, a pattern historically associated with bear markets.
Implications for investors
For global investors, including those in India who allocate to U.S. equities through mutual funds and ETFs, the current landscape suggests heightened volatility. While exposure to the AI‑driven mega‑caps may continue to deliver strong returns, the broader market’s under‑performance could affect diversified portfolios and index‑linked products. Market participants are advised to monitor breadth indicators, yield movements, and sector‑specific earnings trends before adjusting allocations.
Overall, the S&P 500’s record highs mask a fragile underpinning. If bond yields stabilize and more stocks join the upside, the rally could sustain; otherwise, a correction may be the market’s way of rebalancing after months of concentrated gains.
Source: Yahoo Finance
This article was compiled by the IndiaBBCNews editorial system from verified international news sources. Facts have been independently reviewed. Original reporting: Yahoo Finance.
