What is an Index Fund?
If you've started reading about investing, you've probably come across the term index fund. It's mentioned in countless books, podcasts and YouTube videos, and many experienced investors recommend them as the best place for beginners to start.
But what actually is one?
At its simplest, an index fund is an investment fund that aims to track the performance of a particular stock market rather than trying to beat it. Instead of paying a fund manager to decide which companies are worth buying, an index fund simply owns all, or at least most, of the companies that make up a chosen stock market index.
For example, an FTSE 100 index fund invests in the 100 largest companies listed on the London Stock Exchange. An S&P 500 index fund invests in 500 of the largest companies in the United States, while a global index fund owns thousands of companies across developed and emerging markets around the world.
When you buy units in an index fund, you're effectively buying a tiny slice of every company within that fund. Rather than relying on one business to perform well, you're spreading your investment across hundreds or even thousands of companies.
This is a question I used to ask myself when I first became interested in investing.
Surely, if you could pick the next Apple, Amazon or Nvidia before everyone else, you'd make far more money?
The problem is that consistently picking winning companies is incredibly difficult. Even professional fund managers, with teams of analysts and access to huge amounts of research, often struggle to beat the market over long periods.
Instead of trying to predict tomorrow's winners, an index fund simply accepts that nobody knows for certain what the future holds. By owning the whole market, you benefit from the success of the companies that grow while reducing the impact of those that don't.
One of the biggest advantages of an index fund is diversification.
You've probably heard the phrase, "Don't put all your eggs in one basket." Investing is no different.
If you invested all of your money in a single company and that business ran into trouble, your investment could lose a significant amount of its value. An index fund spreads that risk by investing in hundreds or thousands of different companies, often across multiple countries and industries.
Some businesses will perform exceptionally well, others won't, but you're not relying on the success of any one company.
Index funds have become increasingly popular because they're simple, diversified and inexpensive.
Unlike actively managed funds, which employ managers to research companies and buy and sell investments, index funds simply follow the market. Because there's much less buying and selling, the costs are usually much lower.
That matters because fees reduce your returns. A fund charging 1% per year may not sound expensive, but over several decades those extra costs can add up to many thousands of pounds. Keeping fees low means more of your money remains invested and continues to grow over time.
Much of my own thinking has been influenced by the Boglehead approach to investing, named after John Bogle, the founder of Vanguard (whose funds I invest in).
It isn't about finding the next winning share or trying to beat everyone else. It's about accepting that markets generally grow over time and allowing your investments to grow alongside them.
I like that approach because it removes the need to constantly watch the markets or second-guess every investment decision. As teachers, we've all got enough to think about without spending our evenings analysing company accounts.
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It's important to remember that index funds are investments, not savings accounts. Their value will go up and down, and there will be times when markets fall significantly. If you're investing, you should be prepared for periods where your portfolio loses value.
However, for people investing over decades rather than months, history has shown that broadly diversified stock markets have generally rewarded patient investors. Of course, past performance doesn't guarantee future returns, but it's one of the reasons index investing has become so widely accepted as a sensible long-term strategy.
The more I've learned about investing over the years, the more I've come to appreciate that successful investing doesn't have to be complicated.
For many people, including teachers, owning a low-cost, globally diversified index fund can be a simple and effective way of investing for the long term. Rather than trying to outsmart the market, you're simply participating in the growth of businesses around the world and allowing time to do much of the hard work.
This article is for educational purposes only and does not constitute financial advice or a personal recommendation. Investments can fall as well as rise, and you may get back less than you invest. Past performance is not a reliable guide to future returns.