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Chapter 2: Understanding Index

11 Apr 2026 • NISM-Series-8: Equity Derivatives Mock Tests

NISM Series VIII: Equity Derivatives — Chapter 2: Understanding Index

Introduction to Market Indices

An index is a fundamental concept in financial markets. Understanding its role, calculation, and utility is crucial for any market participant, especially in the equity derivatives segment.

What is a Stock Market Index?

An index is a portfolio of securities that represents a particular market or a specific portion of a market. Rather than tracking every single security individually, an index aggregates the price movements of a selected basket of stocks to provide a consolidated view.

Key characteristics of an index include:

Calculation Methodology: Each index is designed and calculated based on its own unique and predefined calculation methodology.
Base Value: Indices are typically expressed in terms of a change from a specified base value.
Market Indicator: It serves as an indicator of the performance of the overall stock market or a particular sector.
Performance Benchmark: An index acts as a benchmark against which the performance of active portfolios and investment strategies can be measured.
Derivative Underlying: It is widely used as an underlying asset for various financial applications, particularly exchange-traded derivative contracts.

Types of Stock Market Indices

The composition and movement of a stock market index are determined by how its constituent stocks are weighted. Different weighting methodologies yield different types of indices. The four primary types of stock market indices explained in the study material are:

1. Market Capitalisation Weighted Index

In a market capitalisation weighted index, each constituent stock is assigned a weight based on its market capitalisation.

Weighting Rule: Under this method of calculation, the higher the market capitalisation of a constituent, the higher is its weight in the index. Consequently, a price movement in a high-capitalisation stock will have a much greater impact on the index's value than a similar price movement in a low-capitalisation stock.
Historical Context in India: In India, popular and widely tracked indices such as the Sensex and the Nifty were earlier designed and calculated using this traditional market capitalisation weighted method.

2. Free-Float Market Capitalisation Weighted Index

Equity holding is divided differently among various stakeholders in a company. Modern markets have started to segregate this holding on the basis of what is readily available for trading and what is not.

The Concept of Free Float: The portion of a company's equity that is readily available for immediate trading in the open market is categorised as free float.
Weighting Rule: If we compute the index based on the weights of each security determined by its free-float market capitalisation, it is called a free-float market capitalisation index.

3. Price Weighted Index

A price weighted index is calculated based on the individual share prices of its constituent stocks, rather than their market capitalisation.

Weighting Rule: It is a stock index in which each constituent stock influences the index in direct proportion to its price.
Impact of Stock Prices: Constituent stocks with a higher absolute share price are given more weight and, therefore, exert a greater influence over the performance and overall direction of the index.

4. Equal Weighted Index

An equal weighted index removes the bias toward larger or higher-priced companies by treating all constituent stocks uniformly.

Weighting Rule: This methodology makes no distinction between large and small companies. Both are given an equal weighting in the index portfolio.
Calculation: The value of the index is generated by adding the individual prices of each stock in the index and then dividing that sum by the total number of stocks.

Comparison of Index Weighting Methodologies

Index Type	Basis of Weighting	Influence of Large Companies	Historical or Global Context
Market Capitalisation Weighted	Total Market Capitalisation (Shares Outstanding \(\times\) Price)	Higher weight given to companies with larger market capitalisation	Earlier design of India's flagship indices, BSE Sensex and NSE Nifty
Free-Float Market Capitalisation	Free-Float Market Capitalisation (Readily tradable shares \(\times\) Price)	Weighted by publicly tradable value, excluding locked-in shares	Adopted globally and in modern Indian index calculations
Price Weighted	Absolute Share Price	Highly influenced by stocks with higher share prices, regardless of company size	Share price determines influence, regardless of company size
Equal Weighted	Uniform Weight across all constituents	Equal weight is given to both small and large companies alike	Generated by summing constituent prices and dividing by total stock count

Key Attributes of a Good Market Index

For an index to be highly reliable, useful, and trusted by market participants as a benchmark or an underlying asset for derivatives, it must possess several essential characteristics. A good market index should have the following attributes:

Reflect Market Behaviour: The index must accurately reflect the overall market behaviour or the specific portion of the market it represents.
Independent Computation: It must be computed by an independent third party and be completely free from the influence of any market participant. This ensures transparency and objectivity.
Professional Maintenance: The index must be professionally maintained to ensure its calculations and constituent lists remain accurate over time.

Index Management

Index management is a rigorous process that is typically carried out by specialised agencies to ensure the integrity, relevance, and accuracy of the benchmark. It is broadly classified into three main operational phases:

Index Construction: This is the initial phase where the portfolio of securities is selected and the calculation methodology is established.
Index Maintenance: This involves day-to-day calculations, tracking changes, and making adjustments for corporate actions (such as mergers, splits, or bonuses).
Index Revision: This is the periodic review process where some stocks may be excluded from the index and new, eligible stocks are included to maintain the index's representativeness.

Understanding Liquidity and Impact Cost

Liquidity is a vital concept in both cash and derivatives markets. In the context of the stock market, liquidity refers to a market where large orders can be executed without moving the prices.

Measuring Liquidity: A key metric used to evaluate this ease of execution is Impact Cost.
Numerical Illustration: While the study notes acknowledge the importance of understanding this concept through practical examples, students are advised that the full numerical example illustrating the exact calculation of impact cost is provided in the comprehensive NISM Series VIII textbook.

Financial Applications of Indices

Stock market indices are not just statistical measures; they form the foundation for several major financial products. The primary applications of indices include:

1. Index Funds

Index funds are passive mutual funds designed to track the performance of a specific index.

Investment Objective: The sole objective of an index fund is to generate investment returns that are equivalent to the return on the index itself.
Portfolio Strategy: To achieve this, the fund manager invests in the exact index stocks in the same proportions in which these stocks exist in the index.

2. Index Derivatives

Index derivatives are exchange-traded contracts that use a stock index as their underlying asset.

Popular Contracts: Index Options and Index Futures are the most popular and actively traded derivative contracts worldwide.
Hedging Tool: Index derivatives serve as an excellent and highly efficient tool for market participants to hedge against overall market risk.

3. Exchange Traded Funds (ETFs)

Exchange Traded Funds (ETFs) are passive investment vehicles that track an index but trade like individual stocks.

Trading Mechanism: ETFs have a number of advantages over traditional mutual funds as they can be bought and sold on the exchange.
Intraday Trading: Since ETFs are traded directly on exchanges, intraday transaction is possible.
Basket Trading: Furthermore, ETFs can be used for basket trading in terms of smaller denominations and low transaction costs.

Important Terms for the NISM Series VIII Exam

To clear the certification exam, students should memorise these key index-related terminologies:

Underlying Asset: The underlying represents the financial asset (such as a metal, agricultural commodity, financial asset, or stock index) from which a derivative contract derives its value.
Free Float: The portion of a company's outstanding shares that is readily available for trading in the stock market.
Benchmark: A standard index against which the performance of a portfolio manager or mutual fund is evaluated.
Passive Investing: An investment strategy (like index funds and ETFs) that replicates the performance of a specific market index rather than trying to outperform it.
Impact Cost: A measure of market liquidity, representing the transaction cost associated with executing large orders without moving market prices.

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NISM-Series-8: Equity Derivatives Mock Tests — FAQs

The NISM Series 8 Equity Derivatives exam consists of 100 multiple-choice questions. Candidates must complete the exam within 2 hours. The questions test knowledge of derivatives markets, futures, options, trading strategies, clearing mechanisms, and risk management. Practicing a NISM 8 mock test with 100 questions helps simulate the real exam environment.

The passing marks for NISM Series 8 Equity Derivatives certification are 60%. This means candidates must score at least 60 out of 100 marks to pass the exam. Preparing with realistic NISM Equity Derivatives mock tests improves accuracy and helps candidates achieve the required passing score.

Yes, the NISM Series 8 exam has negative marking. For every incorrect answer, 25% of the marks assigned to that question are deducted. Since each question carries 1 mark, 0.25 marks are deducted for wrong answers. Practicing with a NISM 8 mock test helps reduce mistakes and manage negative marking.

The NISM Series 8 Equity Derivatives exam fee is approximately ₹1500 (excluding GST). After passing the exam, the certification remains valid for 3 years. Candidates must renew their certification before expiry through the NISM Continuing Professional Education (CPE) program or by re-taking the exam.

To pass NISM Series 8 in the first attempt, candidates should study the official NISM workbook, understand derivatives concepts clearly, and practice regularly with NISM Equity Derivatives mock tests. Attempting multiple full-length mock tests and chapter-wise quizzes improves accuracy, time management, and exam confidence.

The NISM Series 8 syllabus covers topics related to equity derivatives markets. Key topics include basics of derivatives, futures contracts, options contracts, trading strategies, clearing and settlement, risk management, and regulatory framework. Understanding these concepts through practice questions and mock tests helps candidates prepare effectively.

Yes, PassNISM.in provides free NISM Series 8 mock tests for candidates preparing for the Equity Derivatives certification exam. These tests are designed based on the latest NISM exam pattern and help students practice real exam-style questions, case studies, and time-based tests before attempting the final exam.

On PassNISM.in, candidates can access multiple NISM Series 8 mock tests, including full-length practice tests and topic-based quizzes. These mock tests simulate the real exam environment with 100 questions and a 2-hour timer, helping candidates improve accuracy and exam readiness.