Mega-IPOs from SpaceX and others could intensify 'dangerous' concentration risk in stocks

Mega-IPOs from SpaceX and others could intensify 'dangerous' concentration risk in stocks

Michael M. Santiago/Getty ImagesNearly 40% of the S&P 500's weight is made up of its 10 largest stocks.If SpaceX, OpenAI, and Anthropic go public, that weighting could jump to 50%. While top-heavy market concentration isn't inherently bad, experts warn it can intensify risks.Just 10 stocks account for nearly 40% of the S&P 500's value, the highest concentration in the stock market since the Great Depression.What's more, if SpaceX, OpenAI, and An…