SpaceX Anthropic mega-IPOs threaten index fund exposure

SpaceX Anthropic and other major IPOs may exclude index funds from key tech holdings due to high valuation and limited diversification in fund portfolios. The companies' rapid market capitalization growth increases volatility and reduces allocation stability for passive funds. Index fund managers face pressure to adjust holdings amid shifting investor sentiment. The impact is most pronounced in large-cap tech index funds that rely on stable component performance.