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MarketWatch

Wall Street and AI ruined your ‘diversified’ portfolio

Tuesday, September 22, 2026


Technology stocks, including those in artificial intelligence, comprise a significant portion of major U.S. stock indices. The S&P 500's largest companies include multiple AI-related firms, which means portfolios tracking broad market indices hold substantial exposure to this sector. Portfolio performance depends partly on continued investor interest and profitability in AI companies.

Original reporting: https://www.marketwatch.com/story/wall-street-and-ai-ruined-your-diversified-portfolio-f1255373?mod=mw_rss_topstories

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