Should I buy the FTSE 100 today?

The FTSE 100 could be a great way to gain exposure to some of the UK’s largest companies when held as part of a diversified portfolio.

The content of this article was relevant at the time of publishing. Circumstances change continuously and caution should therefore be exercised when relying upon any content contained within this article.

You’re reading a free article with opinions that may differ from The Motley Fool’s Premium Investing Services. Become a Motley Fool member today to get instant access to our top analyst recommendations, in-depth research, investing resources, and more. Learn More.

The FTSE 100 is the UK’s leading stock index. It comprises the 100 largest qualifying companies listed on the London Stock Exchange

To qualify for inclusion, companies must meet several criteria. These include having a full listing on the London Stock Exchange with a sterling price, adherence to UK Corporate law and a minimum percentage of shares available for trading. 

FTSE 100 companies are generally considered high-quality investments due to these requirements. What’s more, around 70% of the index’s profits come from outside the UK. So, this is more than just a UK index. These are some of the world’s best businesses at what they do. 

And because the FTSE 100 is one of the world’s largest stock indexes, with a market capitalisation of nearly £2trn, investing in it is straightforward.

FTSE 100 costs 

FTSE 100 tracker funds are designed to replicate the index with the lowest possible costs. The cheapest tracker on the market at the moment charges just 0.06% in annual management fees.

By comparison, the average actively managed investment fund charge is between 0.75% and 1.25% per annum. This difference in charges could have a big impact on returns in the long run.

For example, if I invested £1,000 in a low-cost tracker with an average annual management charge of 0.06%, and that tracker went on to return 5% a year for 10 years, I would end up paying £9 in fees.

However, if I made the same investment in an active fund with an annual management charge of 1%, I would end up paying £150 in fees over the space of a decade. 

That said, it’s not all about fees. Actively managed funds can charge more because they spend more time trying to pick stocks. This can lead to market-beating performance.

So, it might be worth paying the extra money in some cases. Other funds also offer exposure to different investment themes and assets, which can help provide diversification for a portfolio. That’s why I wouldn’t write off active funds entirely just because they are a bit more expensive. 

Diversification is key

Still, I believe buying a FTSE 100 tracker is a great way to gain exposure to 100 of the world’s largest companies quickly and cost-effectively. But I don’t think the index is a one-stop-shop. It is mostly made up of large corporations, which don’t tend to grow as fast as they’re smaller peers.

This is not always correct, but the law of large numbers can act as a sticking point for growth. A business with sales of £10bn, for example, is unlikely to be able to drive revenue growth of 100% in a year. However, a company with sales of £10m may achieve that sort of growth. 

There’s also some risk as the FTSE 100 has limited exposure to technology companies, which have registered faster growth recently. This has held back the index’s performance in comparison to other investments. Still, past performance is no guarantee of future returns. So, this may or may not continue to be a headwind in future. 

Therefore, while I think that the FTSE 100 is a great way to invest in some of the world’s largest companies, I would only devote a portion of my portfolio to this investment. Other stocks, shares and funds may offer access to different sectors and industries, providing more diversification. All in all, I would only own the index as part of a diversified portfolio. 

Rupert Hargreaves owns no share mentioned. The Motley Fool UK has no position in any of the shares mentioned. Views expressed on the companies mentioned in this article are those of the writer and therefore may differ from the official recommendations we make in our subscription services such as Share Advisor, Hidden Winners and Pro. Here at The Motley Fool we believe that considering a diverse range of insights makes us better investors.

More on Investing Articles

A senior man and his wife holding hands walking up a hill on a footpath looking away from the camera at the view. The fishing village of Polperro is behind them.
Investing Articles

Is 50 too old to start buying shares?

Christopher Ruane explains why 'better late than never' is key to his thinking about whether 50's too old to start…

Read more »

Two male friends are out in Tynemouth, North East UK. They are walking on a sidewalk and pushing their baby sons in strollers. They are wearing warm clothing.
Investing Articles

Here’s what £150 a month in a Junior ISA could be worth by 2045…

You might be surprised to learn by how large a Junior ISA portfolio could become inside 20 years from modest…

Read more »

Investing Articles

This red hot equity fund in my SIPP returned 12.6% in the first 2 months of 2026

This global equity fund is delivering huge returns for Edward Sheldon’s SIPP in 2026, despite all the risks and uncertainty…

Read more »

Friends at the bay near the village of Diabaig on the side of Loch Torridon in Wester Ross, Scotland. They are taking a break from their bike ride to relax and chat. They are laughing together.
Investing Articles

Want to retire richer? Here’s Warren Buffett’s golden rule to build wealth

If you want to build wealth for a richer retirement, then following Warren Buffett’s golden rule might be the best…

Read more »

Black woman using smartphone at home, watching stock charts.
Investing Articles

Get ready for stock market volatility…

As conflict in the Middle East makes share prices fluctuate, what strategies can investors use to try and find opportunities…

Read more »

British Isles on nautical map
Investing Articles

Why the FTSE 100 fell almost 5% this week

Declines in mining shares dragged the FTSE 100 down after a strong start to the year. Is the pullback an…

Read more »

Middle aged businesswoman using laptop while working from home
Investing Articles

How much do you need to invest in US stocks to earn a £2,000 monthly passive income?

Is it possible to target several thousand pounds of passive income each month by buying US growth stocks? Absolutely –…

Read more »

A mature woman help a senior woman out of a car as she takes her to the shops.
Investing Articles

How big does your ISA need to be to earn £1,000 a month in passive income?

Andrew Mackie explains how a long-term ISA strategy can help investors build a chunky £12,000 passive income in less than…

Read more »