Share your opinion and earn yourself a free Motley Fool premium report!

We are looking for Fools to join a 75 minute online independent market research forum on 15th / 16th December.

To find out more and express your interest please click here

1 critical mistake to avoid at all costs when the S&P 500 crashes

The S&P 500 will crash again. Maybe not in 2025, but a meltdown will eventually come. And when it does, investors mustn’t make this critical error.

| More on:

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.

Tabletop model of a bear sat on desk in front of monitors showing stock charts

Image source: Getty Images

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.

Over the last five years, the S&P 500 has delivered a total return of 115% to investors. It’s been a pretty impressive run, especially considering this includes the rough stock market correction of 2022. But with uncertainty brewing surrounding tariffs and US economic growth, this winning streak might soon come to an end.

While few experts are predicting a US stock market crash right now, the S&P 500 will undoubtedly drop sharply again at some point in the future. And when it does, investors need to be intelligent.

By avoiding the critical mistake that most investors make, wealth can potentially flourish rather than being decimated.

Golden rule: don’t panic

In the short term, the stock market is incredibly erratic. That makes it exceptionally difficult to predict, even by experienced experts. This has been demonstrated countless times throughout history, and investors have once again seen it first-hand in April.

When tariffs were first announced, experts predicted a new recession and sky-high inflation. Investors panicked, sending the S&P 500 crashing by double-digits in a matter of days. And yet, just as soon as things seemed to be getting worse, the index rallied.

Within less than a month, the S&P 500 fully recovered, before going on to reach new record highs. And anyone who sold at the bottom has subsequently missed out on a 33% return.

History has shown countless times that when the stock market collapses, one of the best moves is to simply do nothing. Investors who just sat on their hands throughout April suffered some painful losses initially, but ultimately recovered and went on to enjoy a 17% gain.

Some have earned even more by capitalising on the chaos and loading up on fantastic stocks while everyone else was busy selling.

Focus on the long run

Arista Networks (NYSE:ANET) is one of many S&P 500 stocks that suffered a major sell-off in April. In fact, within two days, it had lost 20% of its market capitalisation. Yet even with the disruptive forces of tariffs, the group’s networking infrastructure technology didn’t lose its critical status. And investors who remained focused on the long run and snapped up more shares have gone on to enjoy a staggering 121% return!

Today, Arista continues to show promising long-term potential. The group’s positioned itself as a leader in high-bandwidth networking, benefiting from cloud adoption trends as well as increasing AI data centre investments. So much so that the group’s latest results firmly beat expert predictions, sending shares flying once again.

Of course, no stock, even those in the S&P 500, is without its risks. Beyond a lofty valuation, the group has enormous levels of customer concentration.

More than a third of its top-line income stems from Microsoft and Meta Platforms. Apart from limiting its negotiating power in product pricing, should either of these companies decide to swap to a competing supplier, Arista could become massively disrupted, likely sparking enormous volatility.

While that’s a significant risk, the industry-leading quality of its hardware and software acts as a natural buffer. And while the valuation’s definitely pricey today, that may no longer be the case when the S&P 500 suffers another crash in the future. That’s why I’m patiently waiting for a new opportunity to buy more in the future.

Zaven Boyrazian has positions in Arista Networks. The Motley Fool UK has recommended Arista Networks, Meta Platforms, and Microsoft. 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

Young woman holding up three fingers
Investing Articles

Want to start investing in 2026? 3 things to get ready now!

Before someone is ready to start investing in the stock market, our writer reckons it could well be worth them…

Read more »

Investing Articles

Can the stock market continue its strong performance into 2026?

Will the stock market power ahead next year -- or could its recent strong run come crashing down? Christopher Ruane…

Read more »

Businessman hand stacking money coins with virtual percentage icons
Investing Articles

Here’s how someone could invest £20k in an ISA to target a 7% dividend yield in 2026

Is 7% a realistic target dividend yield for a Stocks and Shares ISA? Christopher Ruane reckons that it could be.…

Read more »

A quiet morning and an empty Victoria Street in Edinburgh's historic Old Town.
Investing Articles

How little is £1k invested in Greggs shares in January worth now?

Just how much value have Greggs shares lost this year -- and why has our writer been putting his money…

Read more »

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

This cheap FTSE 100 stock outperformed Barclays, IAG, and Games Workshop shares in 2025 but no one’s talking about it

This FTSE stock has delivered fantastic gains in 2025, outperforming a lot of more popular shares. Yet going into 2026,…

Read more »

Close-up of British bank notes
Investing Articles

100 Lloyds shares cost £55 in January. Here’s what they’re worth now!

How well have Lloyds shares done in 2025? Very well is the answer, as our writer explains. But they still…

Read more »

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

How much do you need in an ISA to target £2,000 a month of passive income

Our writer explores a passive income strategy that involves the most boring FTSE 100 share. But when it comes to…

Read more »

Investing Articles

£5,000 invested in a FTSE 250 index tracker at the start of 2025 is now worth…

Despite underperforming the FTSE 100, the FTSE 250 has been the place to find some of the UK’s top growth…

Read more »