The National Stock Exchange of India said on Thursday it will retain weekly derivative contracts linked to the benchmark Nifty 50 index, after the country's markets regulator announced tighter rules for equity derivatives.

This move follows SEBI’s recent directive, which mandates exchanges to limit weekly options expiries to just one index per exchange, starting November 20.

National Stock Exchange (NSE) has retained Nifty weekly options contract while letting go Nifty Bank, Nifty Midcap Select and Nifty Financial Services, in line with the Sebi circular which mandates exchanges to provide derivatives contracts for only one of its benchmark index with weekly expiry,