From September 2025, NSE shifted its derivatives expiries to Tuesday, so the Nifty weekly contract expires on Tuesday and monthly contracts on the last Tuesday of the month. BSE’s Sensex contracts expire on Thursday, which keeps the two exchanges on separate days.
The change makes more sense when you look at what came before it. Under SEBI’s F&O framework of October 2024, each exchange can offer only one weekly expiry. Bank Nifty, FinNifty and Midcap Select weeklies were discontinued in November 2024, leaving Nifty 50 as NSE’s only weekly contract and Sensex as BSE’s. With so few weekly products left, having NSE and BSE expire on clearly different days spreads expiry-day activity across the week instead of stacking it up.
For a trader, the practical impact is on planning. Say you hold a short Nifty option position into the week. Your theta decay, your margin and the extra 2% ELM on short options all now peak around Tuesday, not Thursday. Many students still carry the old “Thursday expiry” habit from older videos and books, and that leads to positions being managed on the wrong day.
Expiry days have been changed more than once, so treat this as the position as of October 2026 and check the latest NSE circular before you trade. We cover expiry mechanics and margin rules in the Option and Future Certification course.