3 costly investing mistakes to avoid

To become better investors, we first need to recognise where we’re going wrong. Paul Summers offers up three investing mistakes of his own.

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.

Hispanic man using laptop in home office and drinking coffee

Image source: Getty Images

When investing, your capital is at risk. The value of your investments can go down as well as up and you may get back less than you put in.

Read More

The content of this article is provided for information purposes only and is not intended to be, nor does it constitute, any form of personal advice. Investments in a currency other than sterling are exposed to currency exchange risk. Currency exchange rates are constantly changing, which may affect the value of the investment in sterling terms. You could lose money in sterling even if the stock price rises in the currency of origin. Stocks listed on overseas exchanges may be subject to additional dealing and exchange rate charges, and may have other tax implications, and may not provide the same, or any, regulatory protection as in the UK.

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.

Becoming better at anything usually involves needing to reflect on our errors. Stock picking (and holding) is no different. Here are three investing mistakes that have held me back over the years and how I’ve tried to overcome them. 

Mistake #1: Having too little/too much patience

Unless I’m queueing for petrol, I like to think of myself as a patient soul. However, there have been times over my investing journey where I’ve been unable to sit on my hands. This has usually involved snatching at profits ( FTSE 100 stock Halma springs to mind) or selling on a bit of temporary bad news (step forward online casino operator 888). Just to muddy the waters somewhat, I’ve also been too patient at times and waited for a recovery that never arrives. Sometimes it’s better to get out, stay out, and take the loss.

There’s no perfect solution here. However, simply getting into the habit of reflecting on exactly why I’m wanting to act/not act is a start. Keeping a journal and revisiting my reasons for buying a particular stock also helps. Has a company’s strategy changed? Is this now a better business? If yes, why sell?

Mistake #2: It’s all about the price

The ‘buy low, sell high’ mantra persists because it’s patently good advice. However, investing mistakes arise when I tend to put too much weight into categorising something as ‘cheap’ or ‘expensive’. An expensive stock becomes a bargain if the underlying business grows massively. A cheap share can become cheaper if the underlying business is failing.

Now, let’s not get silly here. I’m not suggesting a stock trading on a P/E of 20 is somehow cheaper than one trading on a P/E of 10. My point is simply to look beyond this basic metric and ask whether the price is fair relative to what I’d be getting for it.

Does the company consistently deliver great returns on capital? Is it unfairly valued compared to sub-standard rivals? Does it have the finances to withstand a stock market crash? If so, I’ve likely found a good business worth paying more for. 

Owners of Fundsmith Equity will know that Terry Smith always puts quality ahead of price when picking stocks. To date, this has enhanced rather than impeded his returns.

Mistake#3: Listening to the noise

It’s remarkably easy to assume that the more information I gather about a stock, the greater the edge I have over my peers.

This tactic isn’t necessarily irrational. Finding a promising company that’s flying under many investors’ radars can sometimes generate incredible returns. Think Argo Blockchain from December 2020 to Feburary 2021. 

That said, any information-grabbing exercise must always consider the quality of the source. Back in the day, for example, I’d pay attention to forums and social media sites like Twitter. There would be the odd useful nugget among the dross, but the signal-to-noise trade-off was invariably poor. 

These days, my approach is far more focused and reflects my limited time. My first port of call is always the London Stock Exchange’s news page. I’ll also listen to podcasts or audiobooks from/about proven investors (William Green’s ‘Richer, Wiser, Happier’ is highly recommended).

Again, this won’t guarantee great returns. Even the best are still susceptible to investing mistakes. Nevertheless, standing on the shoulders of identifiable giants rather than unverifiable online personas sounds far less risky.

Should you invest, the value of your investment may rise or fall and your capital is at risk. Before investing, your individual circumstances should be assessed. Consider taking independent financial advice.

Paul Summers owns shares in Fundsmith Equity. The Motley Fool UK has recommended Halma. 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

Businessman hand flipping wooden block cube from 2024 to 2025 on coins
Investing Articles

I bought 1,779 Legal & General shares 2 years ago – see how much dividend income I’ve got since

Harvey Jones holds Legal & General shares and has been pretty underwhelmed by their performance so far. The dividend is…

Read more »

Middle-aged black male working at home desk
Investing Articles

Is the FTSE 100 set to soar? Here are 3 ways to aim to cash in

My outlook for the FTSE 100 is definitely brightening as we get deeper into 2025. How can we make the…

Read more »

Investing Articles

£10k invested in NatWest shares on the ‘Liberation Day’ dip is today worth…

Harvey Jones looks at how NatWest shares have been knocked off course during recent market turbulence, but are now bouncing…

Read more »

Tariffs and Global Economic Supply Chains
US Stock

£5,000 invested in Nvidia stock just before the tariff news is now worth…

Jon Smith talks through the erratic movements in Nvidia stock over the past six weeks and reveals where an investor…

Read more »

Business manager working at a pub doing the accountancy and some paperwork using a laptop computer
Investing Articles

3 high-yield passive income stocks to consider buying right now

These stocks with big dividend yields look very tempting. Passive income investors could do well to consider taking the plunge.

Read more »

Handsome young non-binary androgynous guy, wearing make up, chatting on his smartphone, carrying shopping bags.
Investing Articles

Is a motley collection of businesses holding back this FTSE 100 stock?

Andrew Mackie explains why he's remained loyal to this FTSE 100 stock despite several of its businesses continuing to struggle…

Read more »

Businessman using pen drawing line for increasing arrow from 2024 to 2025
Investing Articles

3 top growth stocks driving wealth in my Stocks and Shares ISA

Our writer shines a light on a trio of outperforming growth firms in his Stocks and Shares ISA portfolio. They're…

Read more »

Young woman working at modern office. Technical price graph and indicator, red and green candlestick chart and stock trading computer screen background.
Investing Articles

Here’s where analysts expect the Lloyds share price to be a year from now

The Lloyds share price has fared well so far in 2025. But with some big issues on the horizon, can…

Read more »