Sensex (Sensitive Index) is India’s oldest and most iconic stock market index, tracking 30 major companies on the Bombay Stock Exchange (BSE). Launched in 1986 with a base value of 100, it has become synonymous with the Indian stock market in popular consciousness. While Nifty is more widely traded, Sensex remains an important benchmark.
- India’s oldest index, tracking 30 BSE stocks
- Free-float market cap weighted methodology
- Base value 100 from 1978-79
How Sensex Works
Sensex calculation uses free-float methodology:
Sensex Calculation:
Index = (Free-Float Market Cap / Base Market Cap) × 100
Free-Float Methodology:
- Counts only publicly tradable shares
- Excludes promoter holdings
- Larger companies have more weight
Historical Milestones:
1979: Base of 100
1992: Crossed 4,000
2006: Crossed 10,000
2014: Crossed 25,000
2021: Crossed 50,000
2024: ~75,000
Quick Reference: Sensex Facts
| Attribute | Details |
|---|---|
| Exchange | Bombay Stock Exchange (BSE) |
| Constituents | 30 stocks |
| Launch Year | 1986 |
| Base Year | 1978-79 |
| Base Value | 100 |
| Current Level | ~75,000 (2024) |
| Full Name | BSE Sensitive Index |
Example: Sensex Composition
Sector Allocation (Approximate):
| Sector | Weight |
|---|---|
| Financial Services | 40% |
| IT | 15% |
| Oil & Gas | 12% |
| Consumer | 10% |
| Auto | 5% |
| Others | 18% |
Top 5 Constituents:
- Reliance Industries
- HDFC Bank
- ICICI Bank
- Infosys
- TCS
Sensex is India’s oldest stock index, tracking 30 major BSE companies since 1986. It uses free-float market cap weighting. While less actively traded than Nifty for derivatives, Sensex remains an iconic measure of Indian market health.
Sensex vs Nifty 50
| Feature | Sensex | Nifty 50 |
|---|---|---|
| Exchange | BSE | NSE |
| Stocks | 30 | 50 |
| Age | 1986 | 1996 |
| F&O Liquidity | Lower | Higher |
| Recognition | Iconic | More traded |
| Correlation | High | High |
Both indices move similarly (0.98+ correlation) since they share major constituents.
Historical Sensex Journey
| Year | Level | Milestone |
|---|---|---|
| 1979 | 100 | Base year |
| 1990 | 1,000 | First thousand |
| 2000 | 5,000 | Tech boom peak |
| 2008 | 21,000 | Pre-crash high |
| 2009 | 8,000 | Financial crisis low |
| 2015 | 30,000 | Modi era |
| 2021 | 60,000 | Post-COVID rally |
| 2024 | 75,000+ | Current levels |
Trading Sensex
Direct Trading
BSE offers Sensex futures and options, though volumes are much lower than Nifty.
ETFs
Sensex ETFs track the index passively. Less popular than Nifty ETFs.
Index Funds
Several mutual funds track Sensex for passive investors.
Correlation Trading
Sensex and Nifty move together—traders often use Nifty but reference Sensex.
Why Sensex Still Matters
Historical Significance
India’s original stock index. Historical comparisons use Sensex.
Public Recognition
Common people know Sensex more than Nifty. News headlines often cite Sensex.
Alternative Benchmark
Some portfolios benchmark to Sensex instead of Nifty.
BSE Platform
Traders on BSE platform use Sensex as primary reference.
Common Mistakes
-
Assuming Sensex and Nifty are different – They’re highly correlated. Move together 99% of the time.
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Trading Sensex derivatives – Low liquidity means higher spreads. Use Nifty instead.
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Converting between indices – Don’t compare Sensex points to Nifty points directly.
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Historical comparisons without context – Sensex at 1,000 vs 75,000 needs inflation adjustment.
How JournalPlus Benchmarks Performance
JournalPlus lets you benchmark returns against both Sensex and Nifty, showing how your trading compares to simple buy-and-hold of either index.
