Index funds explained: What they are and how they work

Imagine if you could own a tiny piece of the entire stock market without the stress of picking individual stocks. What if your portfolio could grow in line with the broader economy, with minimal effort and lower costs? This is exactly what index funds offer - a simple, effective, and low-maintenance way to invest.

Over the years, index funds have gained immense popularity among investors, from beginners to seasoned professionals. But what exactly are they, and why do they matter? Let's break it down.

What is an index fund?

An index fund is a type of mutual fund designed to mirror the performance of a specific stock market index. Instead of actively selecting stocks, these funds simply hold the same securities as the index they track.

For example, if an index fund tracks the Nifty 50, it will invest in the 50 companies that make up the index in the same proportion. Similarly, a Sensex index fund will follow the 30 stocks in the Sensex. The goal is not to outperform the market but to match its returns as closely as possible.

Since index funds operate passively, they require less management, making them cost-effective compared to actively managed funds.

A brief history of index investing

The idea of index investing was pioneered by John Bogle, the founder of Vanguard, who launched the world's first index fund in 1976. His vision was simple: most actively managed funds fail to consistently beat the market, so why not create a fund that simply follows it?

Initially, the concept was met with scepticism. But over time, as data proved that most active funds struggled to outperform their benchmarks after fees, index investing gained widespread acceptance, especially in developed markets. Today, trillions of dollars are invested in index funds globally. In India, too, passive investing is gaining increasing favour among investors.

How do index funds work?

Index funds follow a straightforward strategy:

• Passive management: Unlike actively managed funds, index funds do not rely on stock picking or market timing. They hold the same stocks as the index in the same proportion.
  
• Lower costs: Since there is minimal buying and selling of stocks, the fund has lower transaction costs and management fees, which boosts returns over time.
  
• Tracking error: While index funds aim to replicate the index, there can be slight differences in performance due to factors like fund expenses or rebalancing delays. A good index fund strives to minimise this difference.

Examples of popular index funds

In India, some of the well-known indices on which index funds are based include:

• Nifty 50 index: Tracking India's top 50 companies.
  
• Sensex index: Investing in the 30 largest firms in the Indian market.
  
• Nifty Next 50 index: Capturing the next big companies outside the Nifty 50.
  
• International index: Providing exposure to global markets, such as S&P 500 index funds.

With growing interest in passive investing, fund houses in India now offer a variety of index funds catering to different investor needs.

Conclusion

Index funds are an excellent investment choice for those who prefer a simple, low-cost, and long-term approach to wealth creation. By passively following the market, they remove the need for constant monitoring and complex decision-making.

Instead of trying to beat the market, why not invest in it? After all, history has shown that markets tend to grow over time. An index fund might just be the set-it-and-forget-it solution your portfolio needs to build wealth steadily.

An investor education and awareness initiative of Nippon India Mutual Fund.

Helpful Information for Mutual Fund Investors: All Mutual Fund investors have to go through a one-time KYC (know your Customer) process. Investors should deal only with registered mutual funds, to be verified on SEBI website under 'Intermediaries/Market Infrastructure Institutions'. For redressal of your complaints, you may please visit www.scores.gov.in For more info on KYC, change in various details and redressal of complaints, visit mf.nipponindiaim.com/InvestorEducation/what-to-know-when-investing

Mutual fund investments are subject to market risks, read all scheme related documents carefully.

Also read: Why invest in index funds?

This article was originally published on March 10, 2025.