The decision was taken after BSE requested them to consider shifting the Bank Nifty expiry to any day other than Friday, the release said. In a bit to revive its derivatives segment, BSE had relaunched its future & options (F&O) contracts on Sensex and Bankex on May 15, 2023, with weekly and monthly expiry happening on Friday. NSE’s Nifty and Bank Nifty contracts expire on Thursday.