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What is 100 index in stock exchange?

In the dynamic world of stock exchanges, indices play a pivotal role in measuring the performance of the market and providing investors with valuable insights into its trends and movements. One such index commonly referred to is the ‘100 index’, which typically comprises the top 100 highly capitalized companies listed on a stock exchange. In this article, we will delve into the definition of a ‘100 index’, provide examples of well-known indexes, discuss the composition and criteria for inclusion, highlight sector representation, explain investment implications, explore trading index products, delve into index weighting and rebalancing, and examine the significance of tracking the performance of a ‘100 index’.


Definition of a ‘100 Index’

A ‘100 index’ is a stock market index composed of the top 100 most highly capitalized companies listed on a stock exchange. These indexes serve as benchmarks for measuring the performance of the broader market and are often used by investors, analysts, and financial institutions to assess the health and direction of the economy.


Examples of ‘100 Indexes’

Several prominent examples of ‘100 indexes’ include:


Nasdaq 100 Index: This index comprises 100 of the largest non-financial companies listed on the Nasdaq stock exchange, representing a diverse range of industries such as technology, healthcare, and consumer goods.

FTSE 100 Index: The FTSE 100 Index consists of the 100 most highly capitalized blue-chip companies listed on the London Stock Exchange. These companies span various sectors, including finance, energy, and telecommunications.

Composition and Criteria

The criteria for inclusion in a ‘100 index’ typically revolve around factors such as market capitalization, liquidity, and industry representation. Companies with the highest market capitalization and trading volume are often prioritized for inclusion, ensuring that the index accurately reflects the performance of the most significant players in the market.

Sector Representation

‘100 indexes’ typically encompass a diverse range of sectors to provide a comprehensive snapshot of the market. Sectors represented in these indexes may include technology, healthcare, consumer goods, utilities, and financial services, among others. This sector diversity helps mitigate risk and provides investors with exposure to various segments of the economy.

Investment Implications

While individuals cannot directly purchase an index, they can invest in funds or products that track the performance of these indexes. Exchange-traded funds (ETFs), index mutual funds, futures contracts, options, and contracts for difference (CFDs) are popular investment vehicles that allow investors to gain exposure to the performance of a ‘100 index’ without directly owning the underlying stocks.

Trading Index Products

Investors can trade a variety of index-linked products that replicate the performance of a ‘100 index’. ETFs, for example, are tradable securities that closely mirror the performance of the underlying index. Futures and options contracts allow investors to speculate on the future movements of the index, while CFDs enable traders to profit from both upward and downward price movements without owning the underlying asset.

Index Weighting and Rebalancing

‘100 indexes’ are typically weighted based on factors such as market capitalization, with larger companies carrying more significant weight in the index. Periodic rebalancing is conducted to ensure that the index accurately reflects changes in the market, such as shifts in market capitalization or industry trends. This rebalancing process helps maintain the integrity and relevance of the index over time.

Performance Tracking

The performance of a ‘100 index’ serves as a barometer for the overall market performance and economic health. Investors and analysts closely monitor the movements of these indexes to gauge market sentiment, identify trends, and make informed investment decisions. Additionally, policymakers and economists often use these indexes as indicators of broader economic conditions and trends.


In conclusion, the ‘100 index’ is a vital tool for investors and market participants seeking to gauge the performance of the stock market and track economic trends. Understanding the composition, criteria for inclusion, sector representation, and investment implications of these indexes is essential for making informed investment decisions and navigating the complexities of the financial markets. By leveraging index-linked products and monitoring index performance, investors can effectively manage risk, diversify their portfolios, and capitalize on market opportunities.

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