Carvana, Comfort Systems USA, and CRH to be added to the S&P 500 Index in the upcoming quarterly rebalancing, with Carvana's stock rising 10% in after-hours trading following the announcement

This news story is highly relevant to investors and business professionals managing investment portfolios. The inclusion of a company in the S&P 500 is a significant event with material implications for market exposure, liquidity, and investor flows. The S&P 500 is one of the most widely followed equity benchmarks globally, and being added to it typically triggers automatic buying by index-tracking funds (e.g., ETFs and mutual funds), leading to increased demand and often short-term price appreciation—evidenced here by Carvana's 10% after-hours jump. The fact that multiple reputable sources confirm the addition of Carvana, Comfort Systems, and CRH underscores the legitimacy and market-wide impact of this rebalancing event. Such index changes influence portfolio construction, asset allocation strategies, and sector weighting decisions across institutional and retail investors alike. While not a direct earnings report or Fed decision, the event falls into the 'critical business news' category due to its systemic impact on capital markets and investment strategy. Therefore, this story rates 9–10 on the scale, as it represents a major market-moving event with direct implications for portfolio management, asset allocation, and trading decisions.