Sensex vs Nifty vs Bank Nifty: Differences Explained
Sensex, Nifty 50 and Bank Nifty are stock market indices. Each one tracks a basket of shares so you can see in one number how the market, or a sector, is doing. The Sensex tracks 30 large companies on the BSE, the Nifty 50 tracks 50 on the NSE, and Bank Nifty tracks the biggest banking stocks on the NSE.
Quick comparison
| Sensex | Nifty 50 | Nifty Bank (Bank Nifty) | |
|---|---|---|---|
| Exchange | BSE | NSE | NSE |
| Stocks | 30 | 50 | At least 14 banks |
| Coverage | Large companies across sectors | Large companies across sectors | Banking sector only |
| Base value | 100 (1978-79) | 1,000 (3 Nov 1995) | 1,000 (1 Jan 2000) |
| Weighting | Free-float market capitalisation (bigger companies with more publicly traded shares carry more weight) | ||
Sensex
The BSE Sensex is India’s oldest index. Its 30 companies are chosen by size, liquidity and sector representation. When people say “the market rose 500 points”, they usually mean the Sensex.
Nifty 50
The Nifty 50 covers 50 companies across more sectors, so it’s a broader measure than the Sensex. Most index funds and ETFs in India track it, and it is the most traded index in the derivatives market. Because the two share many of the same large companies, the Sensex and Nifty usually move in the same direction on a given day.
Bank Nifty
Nifty Bank tracks the most liquid, largest private and public-sector banks. Under SEBI’s rules for indices with derivatives, it must hold at least 14 stocks, with no single stock above 20% weight and the top three together at no more than 45%. NSE moved to this structure in stages up to March 2026. Earlier the index had 12 banks, dominated by a few.
Why Bank Nifty is more volatile
- One sector: all its stocks react to the same news, so moves aren’t spread out as they are in the Nifty 50.
- Interest rates: RBI repo rate decisions and bond yields affect every bank’s lending margins at once.
- Asset quality: bad-loan (NPA) numbers and quarterly results of big banks move the whole index.
- Liquidity and foreign flows: banks are heavily owned by foreign institutional investors, whose buying and selling shows up quickly.
The same reasons explain why banking stocks often rise or fall together: they share the same economic drivers.
Sector indices like Nifty IT
NSE also publishes sector indices such as Nifty IT (the largest listed IT services companies), Nifty Auto, Nifty Pharma and Nifty FMCG. Nifty IT is sensitive to the US economy, the rupee–dollar rate and client tech spending, because most Indian IT revenue comes from abroad. See what moves share prices.
Derivatives: what changed
- Since 20 November 2024, SEBI allows only one weekly options expiry per exchange. NSE kept it for the Nifty 50 and BSE for the Sensex. Bank Nifty options now expire monthly.
- Budget 2026-27 raised STT on futures to 0.05% (from 0.02%) and on options premium to 0.15% (from 0.1%).
SEBI studies have repeatedly found that most individual traders lose money in futures and options.
Where to see live values
Check live and historical values on the official NSE and BSE websites, or niftyindices.com for index factsheets and constituent lists. The market is open 9:15 am to 3:30 pm IST, Monday to Friday, except exchange holidays.
Frequently asked questions
Which is better to invest in, Sensex or Nifty?
You can’t buy an index directly. You invest through an index fund or ETF. Nifty 50 funds are more common and slightly more diversified, but long-term returns of the two have been very similar.
Why do Sensex and Nifty points differ so much?
They started from different base values and years, so the point levels aren’t comparable. Compare percentage changes instead.
How many stocks are in Bank Nifty now?
At least 14, under SEBI’s rules for derivative indices. Check the current list in the Nifty Bank factsheet on niftyindices.com.
Related guides
Sources: NSE, BSE, NSE Indices, SEBI. General information, not investment advice.