The growing influence of artificial intelligence-related companies is reshaping the U.S. equity market, with the S&P 500 increasingly behaving as a market of individual stocks rather than a broad reflection of overall market conditions, according to Evercore ISI.
Strategists led by Julian Emanuel said the exceptional performance of a small group of technology giants has been responsible for much of the index’s recent strength, even as investors contend with weaker consumer confidence, elevated energy costs and persistent inflation pressures. Core PCE inflation recently reached 3.3% year-over-year, its highest level since 2023.
A Small Group of AI Leaders Drives Earnings Expectations
Evercore highlighted that Micron (NASDAQ:MU), Nvidia (NASDAQ:NVDA) and Alphabet (NASDAQ:GOOG) together have generated more than 40% of the year-to-date increase in consensus earnings-per-share forecasts for the S&P 500 in 2026.
The concentration of market leadership has become increasingly pronounced, with the ten largest companies in the index now accounting for almost 40% of its total weighting, the highest level on record.
According to the firm, this concentration has allowed the benchmark index to continue advancing despite a more mixed macroeconomic backdrop.
Evercore Maintains Bullish Outlook for the S&P 500
Despite concerns surrounding market concentration, Evercore left its year-end target for the S&P 500 unchanged at 7,750 and maintained a bullish scenario of 9,000.
The firm believes further gains are likely to be supported by continued investment in artificial intelligence, particularly within its preferred sectors: Information Technology, Communication Services and Consumer Discretionary.
Together, these sectors now represent roughly 60% of the S&P 500, compared with 39% when ChatGPT first became publicly available.
AI Continues to Shape Global Equity Markets
Evercore argued that the impact of artificial intelligence extends well beyond the United States.
Markets with significant technology exposure have substantially outperformed peers, with Taiwan and South Korea now reaching market capitalizations comparable to India.
The influence of technology stocks has also expanded within emerging markets. Technology companies now account for 42% of the MSCI Emerging Markets Index, surpassing their weighting in the S&P 500.
Earnings Strength Supports Technology Valuations
Although market concentration remains a concern for some investors, Evercore noted that valuations across the U.S. technology sector remain relatively moderate when compared with historical levels and the broader market.
As a result, investor attention remains focused on earnings sustainability, an area where first-quarter 2026 results provided considerable reassurance.
“exceptionally strong,” the strategists said in reference to the earnings performance delivered during the reporting season.
They added: “Indeed, amidst all the geopolitical pressures, the AI buildout has driven record S&P 500 EPS surprises typically reserved for recession recoveries.”
Narrow Leadership Creates Additional Risks
Even with a constructive long-term outlook, Evercore cautioned that a market led by only a handful of companies carries its own risks.
“Heightened index exposure to a select few names in one theme can also accentuate downside,” the strategists noted.
The firm pointed to periods of volatility driven by mega-cap technology stocks during the fourth quarter of 2025 and the opening months of 2026 as evidence of this vulnerability.
According to Evercore, a renewed escalation in geopolitical tensions could trigger a decline toward the S&P 500’s 200-day moving average near 6,800. Conversely, a reduction in uncertainty and continued AI-driven growth could help propel the index toward the firm’s 9,000 bull-case target.