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Five semiconductor stocks drive over half of S&P 500 gains amid AI boom, raising market concentration concerns.

Market News
19 May 2026
24/7 Wall Street
View Source
Neutral
pluang ai news

Since January 2025, the S&P 500 has risen over 22%, largely fueled by a surge in semiconductor stocks tied to AI spending. Five companies—Nvidia, Micron, Broadcom, AMD, and Intel—account for 51.6% of the index's gains, highlighting a narrow market rally. This concentration suggests the broader market is weaker than it appears, with risks if these key stocks falter. While strong AI demand and pro-business policies support the rally, investors should watch market breadth closely, as healthy bull markets typically need wider participation.

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