Zomato will join the Sensex on December 23. JSW Steel will exit the index. This change will bring $513 million into Zomato. JSW Steel will see $252 million leave. Other companies like Mahindra & Mahindra, ITC, Infosys, and Sun Pharma will also see minor changes in their Sensex weighting. These adjustments reflect the changing dynamics of the Indian stock market.