Here’s how I avoid these 5 big mistakes when looking for the best shares to buy

When I go looking for the best shares to buy, I remind myself to avoid these simple mistakes that could harm my 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.

When hunting for the best shares to buy, simply picking out my favourite companies isn’t enough. I also work hard to avoid making some basic investment mistakes.

Tim Bennett, head of education at investment firm Killik & Co has drawn up a list of the top errors investors make. Here are the five I focus on.

Failing to diversify stocks

I used to pack my portfolio with the best shares I could find to buy at any given moment. Now I’m more preoccupied with striking the right balance. As Bennett points out, no company is immune to single stock risk. Up until 2010, oil giant BP was the largest UK stock and biggest dividend-payer. That ended with the Deepwater oil spill. No firm is too big to fail, so I spread my money around. However, even the most diversified portfolio isn’t shielded from a widespread market crash.

Being ruled by emotion when buying and selling

I try to keep a lid on my emotions when deciding the best shares to buy, but it isn’t easy. That’s one reason I avoid investing in penny shares, as even small movements can have a big impact. I also try to avoid shares that have raced ahead of the market, for fear of jumping on the bandwagon too late in a desperate bid to play catch-up.

Setting limits on the best-buy shares

I used to think setting up stop losses was a great idea. If the stock rises, you keep all your gains. If it falls, you limit your losses. The only time I did it, my stock fell sharply, triggering the stop loss, then rebounded even faster, by which time I was locked out of all its gains. Never again.

Choosing what I think is one of the best shares to buy then setting up a market order to sell once it hits a target price also seems odd. Why set an upper limit on my potential gains?

Letting others decide the best shares to buy

This is a tough one to avoid. Everybody has the herd instinct in them. It’s a necessary survival strategy, but doesn’t work so well when looking for the best shares to buy. By following the crowd I’m likely to repeatedly buy high, then sell low.

As US billionaire investor Warren Buffett famously made clear, I need to do the exact opposite by being “fearful when others are greedy, and greedy when others are fearful”. But that’s easier said than done. And if everybody adopted that strategy, he would have to reverse his mantra.

Getting stuck on old data

Investors can be prone to latch on to past data points that no longer reflect market conditions, Bennett notes. I’ve done that myself, after choosing one of the worst shares to buy rather than the best, grimly hanging on in the hope I can claw back my losses. These days, I’d rather sell and seek better opportunities elsewhere.

Harvey Jones 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

Calendar showing the date of 5th April on desk in a house
Investing Articles

3 things to do right now as the annual ISA deadline looms!

With the ISA contribution deadline less than three weeks away, our writer runs through a trio of things he has…

Read more »

piggy bank, searching with binoculars
Growth Shares

It could be a once-in-a-decade opportunity to buy this cheap FTSE 250 stock

Jon Smith points out a FTSE 250 stock he's weighing up as to whether it could be a rare opportunity…

Read more »

Close-up image depicting a woman in her 70s taking British bank notes from her colourful leather wallet.
Investing Articles

At over 10%, I couldn’t resist this FTSE 250 share’s yield!

Christopher Ruane explains why he has bought into a 10%+ yielding FTSE 250 income share that the market has lately…

Read more »

Investor looking at stock graph on a tablet with their finger hovering over the Buy button
Investing Articles

Jim Cramer is bullish on NIO stock at $5! Should I buy it for my ISA?

NIO stock is trading 26% lower than a few months ago, despite just posting a historic quarter. It it time…

Read more »

Thoughtful man using his phone while riding on a train and looking through the window
Investing Articles

How much do you really need in an ISA to earn a £20,000 passive income

Looking for ways to earn reliable passive income in an ISA? Our writer explores the path to five-figure earnings.

Read more »

Front view of aircraft in flight.
Investing Articles

The Rolls-Royce share price has now fallen 15%. Time to consider buying?

The Rolls-Royce share price is experiencing some turbulence at the moment. Is this a buying opportunity or will there be…

Read more »

Night Takeoff Of The American Space Shuttle
Investing Articles

Should I buy Nasdaq stock Micron for my ISA after blowout Q2 earnings?

Nasdaq tech stock Micron is generating incredible revenue growth at the moment amid the AI boom. Yet it still looks…

Read more »

Hand flipping wooden cubes for change wording" Panic" to " Calm".
Investing Articles

Is it time to dump my shares ahead of an almighty stock market crash? Nah!

How should we cope with growing fears of a stock market crash? 'Keep Calm and Carry On' worked in 1939,…

Read more »