4 common investing mistakes to avoid

I think investors can make far more money from the stock market if they cut out these mistakes.

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.

Investing can often be made to sound simple, but at times it can feel tough. When the stock market is falling it is easy to feel negative. However, I believe that over the long term, most investors can make money from the stock market. Avoiding these common mistakes is one way to make the journey much smoother and hopefully far more profitable too. 

Overtrading

The problems with dipping in and out of shares too frequently are twofold. On the one hand, you as an investor will incur significant brokering costs over time and, even within an ISA wrapper, certain taxes on dealing in shares.

The second problem is the opportunity costs of not holding onto winners. By overtrading, you deny yourself opportunities to benefit from the gains of rising stocks while increasing the risk of picking up shares in stocks that could then fall.

Failing to diversify

By failing to invest in shares from different industries and geographies you fall into the classic trap of having all your eggs in one basket. For example, an investor who’s only holding UK stocks in recent years will likely have underperformed the market because the US and India have had far stronger performing stock markets.

It’s far better from a risk management point of view to spread investments out either via investment trusts or by investing in FTSE 100 companies with significant overseas earnings.  

Taking it too personally

There’s been a lot written about the psychology of investing. It can be all too easy to become attached to a particular company or investment style. Critical analysis and subjectivity of investments is very important in order to be a successful investor. It’s important to ask yourself whether a stock really is worth still owning.

At the end of the day, you need to be ready to drop a share that no longer matches your investment criteria or where the reason for investing has gone. Becoming personally attached to a company makes that harder, so try to avoid it. 

Buying and keeping losers

Probably because of the emotion involved in investing, holding onto share prices that are fast going downhill can be all too easy. It’s happened to just about every investor, but can seriously hurt returns. Even if you believe in the reasons for investing in a company sometimes, it’s better to take a small loss, move on, and buy the shares once the price starts to show signs of recovery.

Similarly, it can be tempting to be contrarian and look to buy shares that are very cheap – for example those with low price-to-earnings ratios and probably high dividends as well – but it’s best to be aware that these “losers” can keep falling, so don’t fall into the trap of buying and holding a share just because it appears cheap.

I hope recognising and avoiding these four mistakes will help you in your investment journey and to get more out of your stock market investments.

Andy Ross has no position in any of the shares 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 »