Sebi has extended the deadline for implementing new eligibility norms for derivatives on non-benchmark indices like Bank Nifty to October 30, 2025. This allows for a phased adjustment of constituent weights, with Bank Nifty rebalancing until March 31, 2026. Additionally, Sebi has postponed the timeline for Qualified Stock Brokers to implement optional T+0 settlement systems, acknowledging system readiness challenges.