
SEBI has directed stock exchanges to implement significant changes to banking and financial services indices. Key modifications include increasing the minimum number of stocks to 14, capping the weight of the single largest stock at 20% (down from 33%), and limiting the combined weight of the top three stocks to 45% (down from 62%). These changes will affect indices like BSE's Bankex and NSE's Bank Nifty. Implementation deadlines are set for December 31, 2023, for Bankex and Finnifty, and March 31, 2024, for Bank Nifty. The move aims to reduce concentration risk and enhance market stability, potentially benefiting smaller banks while creating short-term pressure on larger banks. Passive funds and ETFs will need to rebalance their portfolios accordingly.