3 mistakes I must avoid in the next stock market crash

Investors made plenty of mistakes in the 2020 stock market crash, professionals and private investors alike. Here are three errors I strive to avoid.

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.

In sport, what really stands out among top professionals is they make far fewer unforced errors than amateurs. In the world of investing however, I reckon professionals frequently make more errors than long-term private investors. And I think that shows in a stock market crash more than any other time.

Some mistakes are inevitable, but we can benefit by learning from them. We can also gain from the mistakes of the professionals too.

Don’t panic and sell

What happens when an asset class, like shares, suffers? The institutional investors start messing with their risk calculations and their asset allocation algorithms. If a stock market crash comes along, they’ll shift out of shares. Maybe into bonds, or gold, or whatever.

But that panic-led flight only makes things worse. It pushes shares down further than they would have gone. Now, sure, some will deserve to be valued more lowly when a stock market crash hits. Those are the ones whose businesses are directly affected by whatever catastrophe has kicked it all off. But did the FTSE 100 deserve to crash 35% in a month? It’s now back to a fall of only around 10%, so I don’t think so.

That’s the first mistake, which I didn’t make this time and won’t next time either. I won’t sell shares in perfectly good companies at rock bottom prices when a stock market crash pushes them down too far.

Buy at stock market crash prices

So, should I wait and see how things unfold? No, I want to buy oversold shares when they’re super cheap. I couldn’t buy during the key period around March, because I was already fully invested and had no spare cash for more shares. That makes me ponder another question. Is it a mistake to not keep some cash back for something like a stock market crash? I’ll have to think more about it. But I usually decide that being fully invested is better in the long term.

When it comes to buying, there’s one mistake I always try to avoid. Some of the most tempting bargains can be those stocks directly affected. I’m thinking of companies like Rolls-Royce and International Consolidated Airlines here. Their businesses have been shattered, but they’ll survive and recover, right?

I think so. But I reckon it could be a big mistake to buy before I see real indications of a recovery happening. And I’d surely be wrong to invest in shares that I’d never buy in good times, like airlines.

Never forget the long term

I think possibly the biggest mistake, which really encompasses the first two, would be for me to forget my long-term approach. Even with that in mind, it can be so easy to panic and want to sell when a stock market crash hits and we see our nest egg slipping away. But I bought my shares to hold for the next decade or longer. Not for just this year, or next year.

I might have avoided some short-term losses had I sold some shares. But looking back over my decades of investing, I’m convinced that reacting on short-term situations would have left me significantly worse off.

Alan Oscroft 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

ISA or SIPP? Here’s 1 advantage and 1 disadvantage of both

SIPPs and Stocks and Shares ISAs both have potentially attractive features, as well as downsides. Christopher Ruane looks at some…

Read more »

Portrait of pensive bearded senior looking on screen of laptop sitting at table with coffee cup.
Investing Articles

£1,000 invested in Lloyds shares 6 weeks ago is now worth…

Lloyds shares have been on a huge run in the last couple of years. But is a 15% pullback in…

Read more »

Man smiling and working on laptop
Investing Articles

After the FTSE 100’s slump, these bargain shares are calling!

Are you on the lookout for top cheap stocks to buy? Royston Wild reveals three FTSE 100 value shares he's…

Read more »

Man hanging in the balance over a log at seaside in Scotland
Investing Articles

Worried about a stock market crash? Here are 2 things you should know

A stock market crash may look plausible, but it’s far from a done deal. Still, if markets do wobble, I…

Read more »

piggy bank, searching with binoculars
Investing Articles

This FTSE 100 stock soared 900% — but after a 25% crash, is the rally over?

After blowing away the FTSE 100 in 2025, this miner has hit turbulence in 2026 — Andrew Mackie investigates what’s…

Read more »

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

How much do I need in an ISA for a £700 second income?

Investing in dividend shares can be a great way to target a second income from a Stocks and Shares ISA.…

Read more »

Businessman with tablet, waiting at the train station platform
Investing Articles

If there’s a stock market crash this week, will you be ready?

Christopher Ruane explains why he's not phased by the inevitability of a stock market crash -- but is actively preparing…

Read more »

Mindful young woman breathing out with closed eyes, calming down in stressful situation, working on computer in modern kitchen.
Investing Articles

£15,000 invested in Diageo shares 3 weeks ago is now worth…

Bad times for Diageo shares! The last three weeks have seen yet another drop, but is this a time to…

Read more »