Is the stock market in a bubble?

As the FTSE 100 and the S&P 500 continue to move higher, is the stock market in a bubble? And what should investors do in August if it is?

| 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.

Burst your bubble thumbtack and balloon background

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.

There’s no question that valuations are starting to look stretched in some parts of the stock market. But I don’t think that should deter investors from looking for shares to buy.

It’s hard to make a case for buying Palantir shares at a price-to-sales (P/S) ratio of 120, but not all stocks are the same. The question for investors is where are the opportunities?.

Valuations

Both the FTSE 100 and the S&P 500 are trading at some of their highest price-to-earnings (P/E) multiples in recent years. And that’s because share prices have gone up faster than profits. 

That makes the equation less attractive for investors, but this certainly doesn’t mean a crash is imminent. And I don’t think it’s a good reason to stay away from the stock market entirely.

In general, the fact that a stock trades at an unusually low P/E multiple doesn’t mean it has to go up any time soon. It can take weeks, months, or even years.

Equally, there’s no rule that stocks trading at high multiples have to crash in the near future. Even at a P/S multiple of 120, it’s not illegal for Palantir shares to keep going up!

One reason to stay in the stock market is just because valuation multiples have expanded. But there’s a bigger reason that I think investors should take note of.

It’s nearly always the case in the stock market that there are shares that trade at relatively low prices but could be very rewarding long term. And I think there’s one name that’s hiding in plain sight at the moment. 

Inefficiencies

Shares in Amazon (NASDAQ:AMZN) fell 8% after the firm released its earnings report for the second quarter of 2025. But revenues were up 13% and earnings per share increased by 33%.

The reason the stock fell was because the company’s forecast operating income for Q3 of between $15.5bn and $20.5bn is roughly in line with where it was in 2024.

One potential cause of this is the impact of US tariffs and this is a risk for investors to consider. But at $217, I think the valuation multiple means the stock’s well worth a closer look.

The falling share price means the stock trades at a (trailing) P/E multiple of 33. That’s well below the likes of Walmart (42) and CostCo (53).

I find it hard to see that as anything other than a stock market inefficiency. And that’s without factoring in Amazon’s advertising business growing at 23% a year and AWS posting 17% growth. 

Importantly, I also don’t see tariffs as a genuine threat to Amazon’s long-term competitive position. So I don’t think the stock should be trading at an unusually low P/E multiple.

Opportunities

The truth about the stock market is that there are always shares that are overvalued somewhere. I think that applies to quite a few right now, so it might be fair to say there’s a bubble forming.

Equally though, there are always shares that are undervalued. And the best thing for investors to do is keep looking for these, even when they might seem hard to find.

I have a lot of stocks on my watchlist where I think they’re in bubble territory. But Amazon’s one I’m looking at for my portfolio this month.

Stephen Wright has positions in Amazon. The Motley Fool UK has recommended Amazon and Walmart. 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 Caucasian man making doubtful face at camera
Investing Articles

Time to start preparing for a stock market crash?

2025's been an uneven year on stock markets. This writer is not trying to time the next stock market crash…

Read more »

Santa Clara offices of NVIDIA
Investing Articles

Nvidia stock’s had a great 2025. Can it keep going?

Christopher Ruane sees an argument for Nvidia stock's positive momentum to continue -- and another for the share price to…

Read more »

Close-up of a woman holding modern polymer ten, twenty and fifty pound notes.
Investing Articles

£20,000 in savings? Here’s how someone could aim to turn that into a £10,958 annual second income!

Earning a second income doesn't necessarily mean doing more work. Christopher Ruane highlights one long-term approach based on owning dividend…

Read more »

Road 2025 to 2032 new year direction concept
Investing Articles

My favourite FTSE value stock falls another 6% on today’s results – should I buy more?

Harvey Jones highlights a FTSE 100 value stock that he used to consider boring, but has been surprisingly volatile lately.…

Read more »

UK supporters with flag
Investing Articles

See what £10,000 invested in the FTSE 100 at the start of 2025 is worth today…

Harvey Jones is thrilled by the stunning performance of the FTSE 100, but says he's having a lot more fun…

Read more »

Investing Articles

Prediction: here’s where the latest forecasts show the Vodafone share price going next

With the Vodafone turnaround strategy progressing, strong cash flow forecasts could be the key share price driver for the next…

Read more »

Front view of a young couple walking down terraced Street in Whitley Bay in the north-east of England they are heading into the town centre and deciding which shops to go to they are also holding hands and carrying bags over their shoulders.
Investing Articles

How much do you need in a SIPP or ISA to aim for a £2,500 monthly pension income?

Harvey Jones says many investors overlook the value of a SIPP in building a second income for later life, and…

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

Can you turn your Stocks and Shares ISA into a lean, mean passive income machine?

Harvey Jones shows investors how they can use their Stocks and Shares ISA to generate high, rising and reliable dividends…

Read more »