The prudential norms require Non- Benchmark Indices (NBIs) to have a minimum of 14 constituents, with the top constituent’s weight not exceeding 20% and the top three combined weights not exceeding 45%. To comply with these rules, stock exchanges must undertake necessary constituent/weight adjustments in the existing indices. For BANKEX and FINNIFTY, this adjustment must be completed in a single tranche by 31st December 2025. For BANKNIFTY, it will be implemented in a phased manner over four monthly tranches to ensure orderly rebalancing of assets under management (AUM).