Bank Nifty, officially the Nifty Bank index, tracks the most liquid and largest Indian banking stocks listed on NSE. It shows how the banking sector as a whole is performing.
Because banks are so closely tied to interest rates, credit growth and the wider economy, Bank Nifty is often more volatile than the Nifty 50. A change in RBI’s policy rate or news about bad loans can move it sharply in a single session.
It’s also a widely traded derivatives index. Some recent changes traders should know:
- Bank Nifty’s last weekly expiry was on 13 November 2024. Under SEBI’s rules, NSE now offers a weekly expiry only on Nifty 50.
- Bank Nifty futures and options now have monthly expiries, which fall on the last Tuesday of the month since September 2025.
- The lot size was revised to 30 from the 30 December 2025 expiry.
These figures are as of October 2026. Lot sizes and expiry rules are revised periodically, so check the latest NSE circular before trading.
A beginner mistake is jumping into Bank Nifty options because they move fast. Fast moves cut both ways, and SEBI’s own studies show most individual F&O traders lose money.
Sector indices, and how bank stocks react to rate decisions, are explained in our Diploma in Stock Market.