Equal-Weight Index Funds: Meaning, How They Work, Benefits, and Risks

An equal-weight index gives every company in the index the same weight. An equal-weight index fund aims to track that index and follows its weighting method.

The key points to remember are:

• In a 50-stock equal-weight index, each stock would have a 2% weight at the time of equal allocation.
• A market-cap-weighted index gives larger companies greater weight.
• Equal weighting reduces the influence of the largest companies within the index.
• Stock prices can cause the weights to change over time, so the index may need periodic rebalancing.
• Equal weighting does not guarantee better returns or lower risk.
• An equal-weight index can perform differently from its market-cap-weighted counterpart in different market conditions.
• An index is a benchmark, while an index fund is an investment scheme that aims to track an index.

Before investing, check the underlying index, its methodology, rebalancing schedule, costs and the mutual fund's Riskometer.

An equal-weight index is an index in which each constituent is assigned the same weight, regardless of its market capitalisation.

For example, imagine an index contains 10 companies. If all 10 companies are equally weighted, each company would have a 10% weight at the time of rebalancing.

If the index contains 50 companies, each would have a 2% weight.

The weight shows how much influence each company has on the index. Equal weighting means that each constituent starts with the same influence.

An equal-weight index fund is a mutual fund or ETF that aims to track an equal-weight index.

An index is a benchmark that follows a defined group of securities and a particular calculation method. An index fund is an investment product that aims to replicate the performance of that benchmark.

For example, an equal-weight index fund tracking the NIFTY 50 Equal Weight Index aims to follow an index where the NIFTY 50 constituents receive equal weights.

You can learn more about index funds to understand how passive funds track their underlying benchmarks.

An equal-weight index fund follows the methodology of its underlying index. The index determines which securities are included and how they are weighted.

Suppose an index has 50 stocks. At the time of equal allocation, each stock may have a 2% weight.

As stock prices change, the value of individual holdings changes at different rates. This can cause the actual weights to move away from 2%.

The index can then be rebalanced according to its stated methodology. The fund tracking the index also adjusts its portfolio to continue following the benchmark.

Equal weighting does not mean that every company is equally sized. It means that each company receives the same weight in the index.

The simplest way to understand equal weighting is to divide 100% by the number of companies in the index.

Equal weight per stock = 100% ÷ Number of stocks

For a 50-stock index:

100% ÷ 50 = 2%

Therefore, each stock would have a 2% weight at the time of equal allocation.

The actual calculation of an index value is more detailed and follows the methodology set by the index provider. For a beginner, the important point is that equal weighting determines the percentage contribution assigned to each constituent.

Rebalancing is the process of adjusting the weights of the index constituents to bring them back in line with the index methodology.

For example, suppose an index has five stocks and each starts with a 20% weight. If one stock rises much more than the others, its weight may increase above 20%.

During a subsequent rebalance, the index can reduce that stock's weight and increase the weights of other constituents to restore the intended allocation.

The exact rebalancing schedule depends on the methodology of the underlying index. Therefore, you should check the index documents rather than assume that every equal-weight index is rebalanced quarterly.

The main difference between the two approaches is how the weight of each company is decided.

The following table shows the basic difference between them:

An equal-weight approach gives each constituent the same starting influence. A market-cap-weighted approach gives larger companies more influence.

Equal weighting changes how exposure is distributed within an index, but it does not automatically make an investment more diversified.

For example, an equal-weight index containing 50 companies still has exposure to those 50 companies and their sectors. If several constituents belong to the same sector, the index can still have sector concentration.

Equal weighting mainly reduces the influence of the largest constituents compared with a market-cap-weighted version of the same index.

Therefore, equal weighting and diversification are related concepts, but they do not mean the same thing.

Equal-weight index funds have a different weighting approach from market-cap-weighted funds. This can affect how much influence individual companies have on the portfolio.

The main features include:

• Equal allocation: Each constituent receives the same target weight according to the index methodology.
• Lower dependence on the largest companies: A few large companies have less influence than they would in a market-cap-weighted version of the same index.
• Systematic approach: The weighting method is defined by the index rather than selected separately for each investment.
• Regular rebalancing: Rebalancing can restore the intended equal weights after market movements change them.
• Different market exposure: The fund can behave differently from a market-cap-weighted index because the weighting of each constituent is different.

These features do not guarantee higher returns or lower risk.

Equal weighting also has limitations. The performance of an equal-weight index can differ from a market-cap-weighted index because the two approaches give different weights to the same companies.

The main points to consider are:

• Rebalancing costs: Restoring equal weights can involve buying and selling securities, which can increase portfolio turnover and transaction costs.
• Different volatility: Giving relatively more weight to smaller constituents within the same index can affect the fund's price movements.
• Different performance: An equal-weight index can outperform or underperform its market-cap-weighted counterpart depending on market conditions.
• Market risk: Equal-weight funds remain exposed to market movements and can lose value.
• Index concentration: Equal weighting does not automatically remove sector or market-wide concentration.

You can also read about volatility to understand how changes in investment values are measured.

Yes, an equal-weight index can outperform its market-cap-weighted counterpart during some periods. It can also underperform during other periods.

The difference depends on how the companies in the index perform relative to one another.

For example, if several companies that have lower weights in a market-cap-weighted index perform strongly, an equal-weight index may benefit more because those companies have a larger relative allocation.

On the other hand, if the largest companies drive market returns, a market-cap-weighted index may have a different performance pattern.

Past performance does not guarantee future returns, so historical performance should not be treated as a prediction.

No. Equal weighting and value investing are different concepts.

Equal weighting determines how much weight each constituent receives in an index.

Value investing is an investment approach that focuses on companies that an investor considers undervalued based on factors such as price and business fundamentals.

An equal-weight index may give a relatively larger allocation to companies that have smaller market capitalisations than the largest companies in its parent index. However, that does not mean the index is selecting stocks based on whether they are undervalued.

An equal-weight approach is only one part of a mutual fund's structure. Before investing, understand the fund and the index it tracks.

Check the following:

• Underlying index: Know which index the fund tracks.
• Index methodology: Understand how constituents are selected and weighted.
• Number of constituents: Check how many securities the index contains.
• Rebalancing schedule: Find out when and how the index restores its target weights.
• Expense ratio: Check the costs charged by the mutual fund.
• Tracking error: Understand how closely the fund has followed its benchmark.
• Riskometer: Check the scheme's stated risk level.
• Investment horizon: Consider whether the fund's risk level suits the period for which you plan to remain invested.
• Tax treatment: Check the tax rules applicable to the fund before investing.

Past returns can provide information about a fund's history, but they do not guarantee future performance.

The NIFTY 50 Equal Weight Index contains the same constituents as the NIFTY 50 but gives them equal weights according to its index methodology.

This means that, at the time of equal allocation, each of the 50 constituents has an equal weight. A fund tracking this index therefore follows a different weighting approach from a fund tracking the standard NIFTY 50.

The two indices can therefore have different performance and risk characteristics even though they contain the same broad set of companies.

Several mutual fund schemes and ETFs can track equal-weight indices in India. Availability can change, so you should check the current scheme list and scheme documents before investing.

Some schemes may track the NIFTY 50 Equal Weight Index, while others may track different equal-weight benchmarks.

Do not assume that all equal-weight funds have the same holdings, costs, risk level or rebalancing schedule. The underlying index and scheme documents determine these details.

An SIP is one method of investing in a mutual fund. If the selected equal-weight index fund offers an SIP facility, you may be able to invest a fixed amount at regular intervals.

The Bajaj Broking website offers SIP and lumpsum investment options for most mutual fund schemes, with a minimum SIP amount of Rs. 100 per month, subject to applicable scheme terms.

You can read more about SIP to understand how regular mutual fund investments work.