How Does the Nifty 50 Rebalance? Learn How Stocks Enter, Exit, and Change Weight in the Index

The Nifty 50 is a stock market index that tracks 50 major companies listed on the NSE. It is reviewed twice a year through a semi-annual rebalancing process. 

During this review, eligible companies may replace existing constituents, while the weights assigned to individual stocks may change based on their latest free-float market capitalisation. (Source: Nifty50 Factsheet, latest available as of September 30, 2026)

A stock market index must evolve with the market it represents. The Nifty 50 reflects the performance of 50 major companies listed on the NSE. However, with time, companies grow, their market capitalisations change, and some businesses may no longer meet the index's eligibility criteria. 

To account for these developments, the Nifty 50 undergoes a “semi-annual” review. During this process, existing companies may be replaced by eligible candidates, and the weights assigned to individual stocks may change based on their free-float market capitalisation. 

Want to understand this process in detail? Read this article to learn how companies enter or exit the Nifty 50 during rebalancing and how their weights in the index change. 

But firstly, let’s understand what the Nifty 50 index is. 

The Nifty 50 is a stock market “index” that tracks 50 major companies listed on the National Stock Exchange (NSE) of India. The index is calculated using the free-float market capitalisation method, where it considers the market value of shares that are available for public trading (rather than all the shares issued by a company). 

Consequently, companies with a higher free-float market capitalisation have a greater influence on the index's value. The Nifty 50 serves several purposes in the investment market. Mutual fund managers use it as a benchmark to compare the performance of some of their funds with that of the index. 

It also serves as the basis for index mutual funds and Exchange-Traded Funds (ETFs), which aim to track its performance. Additionally, the Nifty 50 has several variants, each designed for a specific purpose. For example,

• The Nifty 50 USD and Nifty 50 JPY show their performance in US dollars and Japanese yen, respectively. 
• The Nifty 50 Total Returns Index (Gross and Net) accounts for dividends received from the index's constituent companies.
• The Nifty 50 Dividend Points Index tracks the dividend points associated with dividends declared by the Nifty 50 companies. (Source: Nifty50 Factsheet, latest available as of September 30, 2026)

The Nifty 50 undergoes a “semi-annual” review. Its constituent companies are reviewed twice a year to check whether they still meet the index's “eligibility criteria”.

Eligibility Criteria for Selecting Nifty 50 Stocks

Not every company listed on the NSE can become part of the Nifty 50. A company must meet the following eligibility criteria before it can be considered for inclusion in the index:

(Source: Nifty50 Factsheet, latest available as of September 30, 2026)

Example Related to Nifty 50 Rebalancing Process

Every 6 months, the index provider assesses eligible companies based on the above eligibility criteria. During this review, companies that no longer meet the required criteria may be removed and replaced by other eligible companies.

Let's understand through an example:

• Suppose Company A is part of the Nifty 50, but its trading activity declines over time. 
• During the next semi-annual review, the index provider finds that Company A no longer meets the eligibility criteria. 
• Meanwhile, Company B has grown in market value and meets the required criteria for inclusion. 
• The index provider may remove Company A and add Company B to the Nifty 50. 

Such reviews take place twice a year, with changes to the Nifty 50 scheduled to take effect on the last working day of March and September. If changes are approved, the index provider announces them in advance. 

Note: The Nifty 50 may also undergo changes outside the regular review if a company is delisted, suspended from trading, or impacted by corporate actions.

As mentioned before, the Nifty 50 consists of 50 companies that meet the index's eligibility criteria. Now, each of these 50 companies in the index has a specific weight, expressed as a percentage. 

This weight determines how much the company's share price movements influence the overall value of the Nifty 50. Note that the weight of each company depends on its “free-float market capitalisation”. Consequently,

• Companies with a higher free-float market capitalisation generally have a higher weight.
• Whereas those with a lower free-float market capitalisation may have a lower weight. 

During Nifty 50 rebalancing, the weights are recalculated according to the index methodology. Let’s understand better through an example.

Example

Assume the Nifty 50 has only three companies for this example. Before rebalancing, their weights are as follows:

Suppose Company A's free-float market capitalisation declines, while Company B's increases. During the scheduled review, the index weights are recalculated based on the companies' latest eligible free-float market capitalisations. Their weights might change as follows:

In this hypothetical example, Company A's weight falls from 50% to 40%, while Company B's rises from 30% to 40%. As a result, Company B's share price movements will have a greater influence on the Nifty 50 than before, while Company A's movements will have a smaller influence.

Note: These figures are illustrative. In the actual Nifty 50, weights depend on the free-float market capitalisation of all constituent companies and the index's calculation rules. Rebalancing does not automatically change every company's weight; a weight may also change as share prices and eligible share counts change over time.

So, now you know what the Nifty 50 index is, when it is rebalanced, and how the rebalancing process works. To revise, the Nifty 50 is a stock market index that tracks 50 major companies listed on the National Stock Exchange (NSE) of India. 

It undergoes a “semi-annual” review, in which its constituent companies are assessed twice a year against the index's eligibility criteria. During this process, existing companies that no longer meet the requirements may be replaced by other eligible companies. 

Rebalancing also influences the weight assigned to each constituent, which depends primarily on its free-float market capitalisation. As these values change, a company's influence on the index may increase or decrease.

For more information, you can visit www.tatamutualfund.com/deshkarenivesh. The Investor Service Centre of Tata Asset Management Pvt. Ltd. is located at Mulla House, Ground Floor, 51, M.G. Road, Near Flora Fountain, Mumbai – 400 001, Maharashtra. The office hours are Monday to Friday, 9:00 AM to 5:30 PM. For assistance, you can also call (022) 6282 7777 from Monday to Saturday, 9:00 AM to 5:30 PM, or email service@tataamc.com

1. Can the value of the Nifty 50 index increase after rebalancing?

No, rebalancing does not lead to a rise in the Nifty 50. It only changes the companies included in the index or their weights based on the index methodology.

The index can rise or fall depending on the share price movements of its constituent companies and broader market conditions.

2. How often does the Nifty 50 rebalance?

The Nifty 50 undergoes a semi-annual review, which means its constituents are reviewed twice a year. During these reviews, the index provider checks whether companies meet the eligibility criteria. 

Changes may include the addition or removal of companies and adjustments to their weights, subject to the index methodology.

3. Why does a company's weight in the Nifty 50 change?

A company's weight depends primarily on its free-float market capitalisation relative to that of other constituents. Changes in share prices or the number of shares available for public trading can influence its weight.

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