AI leaders lift the S&P 500 while market breadth deteriorates

what happened

Newsmetry API reports that the US equity market is splitting into two distinct stories. The S&P 500 is less than 1% below its all-time high, but as of October 8, about 68% of its constituents were trading beneath their 50-day moving average and roughly 53% were below the 200-day measure. The assessment comes from Philip Palumbo, founder, CEO and chief investment officer of Palumbo Wealth Management.

Palumbo attributes the index’s entire year-to-date advance to only 30 stocks, each of which has gained at least 82.8% this year. Most are technology companies, with a smaller group from energy, industrials and healthcare; many have links to artificial intelligence. A portfolio containing the remaining 470 S&P 500 names would be approximately unchanged for the year, while 211 constituents are still showing losses. In a note issued late Friday, Palumbo said the market remains centered on AI.

He argues that lower energy costs or diminished inflation expectations could ease the pressure from interest rates in the near term. AI-related spending is helping employment and consumer demand, although government borrowing and data-center construction may sustain capital demand and keep rates supported. Palumbo advises investors not to chase the hottest AI performers and instead maintain diversification.

why it matters

The narrow leadership means the index may give a stronger impression than the broader equity market. A setback in the AI investment cycle could expose underlying weakness, while corrections may create fresh opportunities without guaranteeing a rebound.

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