Wall Street Rally Rests On 'Very Narrow Subset Of Stocks,' Analyst Warns— Is AI Driving A Melt-Up?

Wall Street's rally is becoming increasingly dependent on a small group of mega-cap technology stocks, Standard Chartered analyst Daniel Lam warned on CNBC Thursday, raising concerns that weakening market breadth could make the gains harder to sustain.

“Equities is right now being driven by very very narrow subset of stocks”, Lam, Head of Cross-Asset Derivative Strategy at Standard Chartered Wealth Solutions, said, and added that the high-end semiconductor stocks or the memory stocks are the ones that are driving equity market stocks.

A Handful Of Tech Stocks Continue To Lead

A small group of AI-linked mega-cap tech stocks, including Nvidia (NASDAQ:NVDA), Alphabet (NASDAQ:GOOG) (NASDAQ:GOOGL), and Apple (NASDAQ:AAPL), have driven a significant share of the S&P 500's recent gains, reflecting renewed concentration in the market rally.

Shares of Nvidia and Apple have gained about 14% this year, while Alphabet rose 22%.

Analysts Warn Market Breadth Is Narrowing

Lam added that persistently high interest rates could eventually force investors to reassess current equity valuations, and added that investors may eventually begin to realize valuations have become stretched, potentially increasing the risk of a broader market correction.

“Investors heavily exposed to broad equity indexes should consider diversifying beyond the market's largest constituents to reduce concentration risk,” analysts at UBS said in a note last week.

AI Enthusiasm Continues To Fuel Mega-Cap Gains

Earlier this month, Goldman Sachs analysts said institutional investors are increasingly treating AI-linked stocks as long-term core holdings rather than high-risk growth trades, with many choosing to hold through market volatility amid concerns about being underexposed to the sector's long-term potential.

The AI optimism has been driven by soaring demand for generative AI tools, massive investments in chips and data centers, and expectations that AI could transform industries and boost corporate profits.

Broader Market Participation Remains Weak

Reduced traffic through the Strait of Hormuz amid escalating tensions between the U.S. and Iran has driven oil prices higher, fueling supply-chain disruptions and renewed inflation concerns across the global economy.

Even if the Strait of Hormuz reopens, supply chains could take time to normalize, a lingering risk analysts say global equity markets may not yet be fully pricing in, Lam said.

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