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What is a stock market index, and what are the types of stock market indices?


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Stock Market indices

Understanding Stock Market Indices and its Types


Stock market indices are important statistical tools to track financial markets. They indicate the performance of specific market segments or the entire market. To create stock market indices, stocks from related companies meeting specified requirements are selected from the exchange where they are listed and traded. These indices can be generated based on selection criteria like industry, market sector, or market capitalization.


Different types of stock market indices, including Benchmark Indices, Sectoral Indices, and Market-Cap Based Indices, provide insights into the stock market. Benchmark indices like Nifty 50 and BSE Sensex, which capture the top 50 and 30 performing equities respectively, are the best source of information about how stock market indices behave in general. Sectoral indices measure the performance of companies in a particular sector, while Market-Cap Based Indices select companies based on market capitalization.


Stock market indices provide valuable information for investors, including historical comparisons of stock market returns to other assets like gold or debt, benchmarks to assess equity fund performance, and a leading indicator of how the economy or a specific sector is performing. They are essential to modern financial products like Index Funds, Index Futures, and Index Options. To invest successfully in the stock market, it's important to understand the concepts associated with indices.


Overall, understanding stock market indices and their types is crucial for investors to track the performance and price changes of stocks and to get a rough idea of the stock market's state.


Types of Stock Market Indices:


A stock market index is a measure of the performance of a specific group of stocks that are traded on a particular stock exchange. It is a numerical representation of the average performance of the stocks included in the index, and it is used to track the overall performance of a stock market. The following are common types of stock market indices:

  1. Benchmark Indices: These capture the top performing equities and are regarded as the best source of information about how markets behave in general. Examples include Nifty 50 and BSE Sensex.

  2. Sectoral Indices: These measure the performance of companies in a particular sector, such as technology or healthcare.

  3. Market-Cap Based Indices: These select companies based on market capitalization, such as large-cap or small-cap indices.

Investors must understand the terminologies and concepts associated with indices to invest successfully in the stock market.

Price-weighted index

This type of index is calculated by adding up the prices of the individual stocks in the index and dividing by a divisor. The divisor is used to ensure that the index remains comparable over time, even if there are changes in the individual stock prices.

Market capitalization-weighted index
Equal-weighted index
Sector-specific index
Global index

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