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Divergence of Stock Market Indices (Nifty and Sensex)

PYQs

6

Articles

1

Momentum

17

Phase IFoundation

Background

Overview

Understanding the factors that cause discrepancies in major market indicators, the implications for investors and market analysis, and how regulatory changes can influence index behavior and market perception.

Stock market indices like Nifty and Sensex are designed to reflect the overall performance of specific segments or the broader market. However, differences in their composition and calculation methodologies can lead to significant divergence in their movements, especially during periods of market volatility or regulatory changes.

Phase IIStatic core

Facts & tables

Key facts

Composition Difference

Nifty 50 comprises 50 stocks (NSE), while Sensex comprises 30 stocks (BSE).

Weightage Variation

Even common stocks have different weightages in each index (e.g., RIL, HDFC Bank, ICICI Bank).

Impact of CAS

The new Closing Auction Session (CAS) mechanism initially exacerbated this divergence.

Sensitivity to Heavyweights

Sharp movements in a few heavily weighted stocks can disproportionately impact an index.

Reference table

Key Differences between Nifty 50 and Sensex

FeatureNifty 50Sensex
ExchangeNSEBSE
Number of Stocks5030
Weighting MethodFree-float market capFree-float market cap

Reference table

Static syllabus anchors

TypeReference
Conceptual areaFinancial Markets & Instruments

Reference table

Institutions & roles

BodyRole
National Stock Exchange (NSE)Calculates and maintains nifty
Bombay Stock Exchange (BSE)Calculates and maintains sensex
Phase IIIExam lens

Prelims angle

Overview

Prelims angle: Multi-statement analysis

Prelims angle: Institutional roles and functions

Quick revision

  • Nifty (50 stocks, NSE), Sensex (30 stocks, BSE).
  • Divergence due to different constituents & weightages.
  • CAS initially amplified this divergence.
  • Heavyweight stock movements impact indices differently.
  • Important for market analysis and investor decisions.

High-confidence PYQs

2025Multi-statement analysis, Institutional roles and functions

Consider the following statements: I. India accounts for a very large portion of all equity option contracts traded globally thus exhibiting a great boom. I...

EconomyOpen question

With reference to investments, consider the following: I. Bonds II. Hedge Funds III. Stocks IV. Venture Capital How many of the above are treated as Altern...

EconomyOpen question
2025Multi-statement analysis, Conceptual understanding

Consider the following statements: I. India accounts for a very large portion of all equity option contracts traded globally thus exhibiting a great boom. I...

EconomyOpen question

With reference to investments, consider the following: I. Bonds II. Hedge Funds III. Stocks IV. Venture Capital How many of the above are treated as Altern...

EconomyOpen question
2024Multi-statement analysis, Factual recall

Consider the following statements: 1. In India, Non-Banking Financial Companies can access the Liquidity Adjustment Facility window of the Reserve Bank of I...

EconomyOpen question
2023Multi-statement analysis, Conceptual understanding

Consider the following markets: 1. Government Bond Market 2. Call Money Market 3. Treasury Bill Market 4. Stock Market How many of the above are included i...

EconomyOpen question
2021Multi-statement analysis, Institutional roles and functions

With reference to India, consider the following statements: 1. Retail investors through demat account can invest in ‘Treasury Bills’ and ‘Government of India...

EconomyOpen question
2019Factual recall, Definition-based questions

Which of the following is issued by registered foreign portfolio investors to overseas investors who want to be part of the Indian stock market without regis...

EconomyOpen question

Topic timeline

Financial Markets & Instruments
Prelims 2019· Factual recall, Definition-based questions

Which of the following is issued by registered foreign portfolio investors to overseas investors who want to be part of the Indian stock market without regis...

Open question
Prelims 2021· Multi-statement analysis, Institutional roles and functions

With reference to India, consider the following statements: 1. Retail investors through demat account can invest in ‘Treasury Bills’ and ‘Government of India...

Open question
Prelims 2023· Multi-statement analysis, Conceptual understanding

Consider the following markets: 1. Government Bond Market 2. Call Money Market 3. Treasury Bill Market 4. Stock Market How many of the above are included i...

Open question
Prelims 2024· Multi-statement analysis, Factual recall

Consider the following statements: 1. In India, Non-Banking Financial Companies can access the Liquidity Adjustment Facility window of the Reserve Bank of I...

Open question
Prelims 2025· Multi-statement analysis, Institutional roles and functions

Consider the following statements: I. India accounts for a very large portion of all equity option contracts traded globally thus exhibiting a great boom. I...

Open question

With reference to investments, consider the following: I. Bonds II. Hedge Funds III. Stocks IV. Venture Capital How many of the above are treated as Altern...

Open question
Prelims 2025· Multi-statement analysis, Conceptual understanding

Consider the following statements: I. India accounts for a very large portion of all equity option contracts traded globally thus exhibiting a great boom. I...

Open question

With reference to investments, consider the following: I. Bonds II. Hedge Funds III. Stocks IV. Venture Capital How many of the above are treated as Altern...

Open question

Why Nifty and Sensex diverged after launch of new auction mechanism

05 Aug 2026 · The divergence between Nifty and Sensex is primarily due to differences in their constituent stocks and their respective weightages. Regulatory changes, such as the new CAS, can amplify these divergences, impacting market perception and investor decisions.

Read article

Related topics

Current topic

Divergence of Stock Market Indices (Nifty and Sensex)

Often confused with

Closing Auction Session (CAS) and Stock Price Discovery

Open notes

Practice writing on this topic

UPSC has asked 6 linked questions on Divergence of Stock Market Indices (Nifty and Sensex) in Mains. Write an answer to one — and get it evaluated.

See Mains PYQsEvaluate an answer

UPSC Prelims PYQs on Divergence of Stock Market Indices (Nifty and Sensex)

Practice official previous year questions asked by UPSC related to this concept.

Consider the following statements: I. India accounts for a very large portion of all equity option contracts traded globally thus exhibiting a great boom. I...

2025·Economy
Solve

Which of the following is issued by registered foreign portfolio investors to overseas investors who want to be part of the Indian stock market without regis...

2019·Economy
Solve

Consider the following markets: 1. Government Bond Market 2. Call Money Market 3. Treasury Bill Market 4. Stock Market How many of the above are included i...

2023·Economy
Solve

With reference to India, consider the following statements: 1. Retail investors through demat account can invest in ‘Treasury Bills’ and ‘Government of India...

2021·Economy
Solve

Consider the following statements: 1. In India, Non-Banking Financial Companies can access the Liquidity Adjustment Facility window of the Reserve Bank of I...

2024·Economy
Solve

With reference to investments, consider the following: I. Bonds II. Hedge Funds III. Stocks IV. Venture Capital How many of the above are treated as Altern...

2025·Economy
Solve

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