Wall Street’s Record Rally Conceals Broad Market Weakness as More Than 40% of S&P 500 Stocks Fall in 2026

The benchmark index has risen approximately 14% in 2026, placing it on course for a fourth consecutive annual gain. However, a Reuters analysis of LSEG data found that the median S&P 500 stock had gained only about 4%, while more than 200 companies in the index had declined.

The divergence illustrates how a market-capitalisation-weighted index can continue rising even when a substantial proportion of its members struggle. Companies with large market values exert a greater influence on the index, allowing strong performance by a handful of major businesses to offset weakness elsewhere.

Semiconductor and memory-chip companies have been among the strongest performers. Sandisk and Micron Technology have more than tripled in value this year, while Nvidia, Apple, Micron and Advanced Micro Devices have made significant contributions to the benchmark's advance.

Artificial intelligence has become a dominant investment theme as technology companies expand data-centre capacity and demand for advanced computing hardware increases. Investors have rewarded businesses positioned to benefit from the investment cycle, directing capital towards a relatively narrow group of perceived winners.

The broader picture is less robust. A quarter of S&P 500 companies had fallen by at least 11% in 2026, while fewer than half of current index members were trading above their 200-day moving averages. These indicators suggest that the headline index performance does not fully reflect the market's underlying breadth.

Higher borrowing costs have added to the pressure. The Federal Reserve's September interest-rate increase and expectations of further tightening have weighed on industrial companies, consumer-goods businesses and real-estate stocks. Elevated oil prices have also raised concerns about inflation and household purchasing power.

Eight of the index's 11 major sectors were higher for the year, led by energy and technology. However, technology's large weighting meant it contributed more than 10 percentage points to the index's gain, while energy's contribution was less than one percentage point.

The concentration of returns creates risks if investor enthusiasm for AI weakens, earnings disappoint or interest rates rise more sharply than expected. A rotation away from the largest technology stocks could expose the difference between index strength and the performance of the wider market.

For investors, the figures underline the importance of looking beyond headline index records when assessing market health.