What is Sensex?
Historical Background
Key Points
8 points- 1.
Represents the performance of 30 blue-chip companies listed on the BSE
- 2.
Calculated using the free-float market capitalization method
- 3.
Serves as a benchmark for portfolio performance and investment decisions
- 4.
Reflects investor sentiment and overall economic conditions
- 5.
Changes in the Sensex can impact investor confidence and market volatility
Visual Insights
Evolution of Sensex: Key Milestones
A chronological overview of the Sensex, from its inception to recent market movements, highlighting its journey as India's benchmark index.
The Sensex's journey reflects India's economic liberalization and integration into global markets. From its base in 1978-79, it has evolved to become a crucial barometer, influenced by both domestic policies and international events. The shift to free-float methodology in 2003 made it more representative of actual tradable shares. Recent events in March 2026 underscore its vulnerability to global geopolitical and economic shocks.
- 1978-79Base Year for Sensex (Base Value: 100 points)
- 1986Sensex introduced by BSE as India's first stock market index
- 1991Economic Reforms in India (liberalization, privatization, globalization) - significant impact on market growth
- 2003Sensex calculation switched to Free-Float Market Capitalization method
- 2014FIIs merged into Foreign Portfolio Investors (FPIs) under new SEBI regulations
- March 2026Sensex crashed over 2,000 points (2.8%) amid West Asia conflict and surging crude oil prices, wiping out ₹12 lakh crore investor wealth. India VIX surged to 24.
Recent Developments
5 developmentsFluctuations in the Sensex due to global economic uncertainty and geopolitical events
Increased participation of retail investors in the stock market
Growth of algorithmic trading and high-frequency trading
Debate on the impact of foreign portfolio investment (FPI) on the Indian stock market
Introduction of new indices and investment products by the BSE
This Concept in News
2 topicsAppeared in 2 news topics from Mar 2026 to Mar 2026
Indian Stock Market Plunges 5% Amid Rising Crude Oil Prices and West Asia Conflict
14 Mar 2026This news clearly demonstrates the Sensex's role as a real-time barometer of economic sentiment, especially its vulnerability to external shocks. The sharp decline, fueled by the West Asia conflict and surging crude oil prices to over $115/barrel, highlights how global events directly impact domestic market performance and investor wealth. It reveals that Foreign Institutional Investor (FII) selling pressure is a major driver of such downturns, as they pull funds from emerging markets during uncertainty, contributing to a 12 lakh crore loss. The news also shows the interconnectedness of various economic indicators: rising crude oil prices not only hit corporate profitability (e.g., IndiGo's 7% fall) but also weaken the rupee, forcing the Reserve Bank of India (RBI) to intervene by selling dollars. Understanding Sensex in this context is crucial for analyzing how global instability translates into domestic economic challenges and for evaluating the government's and RBI's responses to maintain financial stability.
Source Topic
Indian Stock Market Plunges 5% Amid Rising Crude Oil Prices and West Asia Conflict
EconomyUPSC Relevance
Frequently Asked Questions
61. What is the Sensex, and why is it important for the Indian economy?
The Sensex, or S&P BSE Sensex, is a stock market index composed of the 30 largest and most actively traded companies on the Bombay Stock Exchange (BSE). It serves as a key indicator of the Indian stock market's performance and reflects investor sentiment and overall economic conditions.
Exam Tip
Remember that the Sensex reflects the performance of the top 30 companies on the BSE and is a barometer of the Indian economy.
2. How is the Sensex calculated, and what does 'free-float market capitalization' mean in this context?
The Sensex is calculated using the free-float market capitalization method. This method considers the market capitalization of a company's shares that are readily available for trading in the market, excluding shares held by promoters, government, and other locked-in categories.
Exam Tip
Understand the concept of free-float market capitalization as it's a common term in stock market indices.
