Group 1 - CRH Cement, Carvana, and Comfort Systems USA will be added to the S&P 500 index during the quarterly adjustment at the end of December, while LKQ Corp., Solstice Advanced Materials, and Mohawk Industries will be removed [1][4] - Following the announcement, Carvana and CRH Cement's stock prices rose approximately 7%, while Comfort Systems USA's stock increased by about 2% in after-hours trading [1] - Carvana's stock price has surged from under $4 in 2022 to around $400 currently, marking a 10,000% increase, attributed to cost-cutting and debt restructuring efforts [1] Group 2 - Companies must have a minimum market capitalization of $22.7 billion and meet profitability, liquidity, and stock float requirements to qualify for inclusion in the S&P 500 index [4] - The inclusion of Carvana, CRH Cement, and Comfort Systems USA is seen as beneficial for industry diversification and aligns with the inclusion criteria [4] - Market strategist Matt Maley noted that while the initial stock price increase following inclusion announcements is often temporary, the significance of such announcements remains due to the popularity of index-tracking funds [4]