We have some exciting news to share! The Motley Fool UK has now become The Twelfth Magpie -- an independent, UK-owned company, led by our long-serving UK management team — Mark Rogers, Chris Nials and Heather Adlington. In practical terms, it’s the same team you know, now fully focused on serving our UK readers and members.

Just as importantly, our approach remains unchanged: long-term, jargon-free, and on your side. This site is our new home, and there will be extra tweaks made across the coming few days as we settle in. So if anything looks a little off, please bear with us!

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.

Why are ARM shares so expensive?

ARM shares rose even further this week. Why are they so expensive? And could the inflated $71 share price still be a good buy?

| More on:
Young woman working at modern office. Technical price graph and indicator, red and green candlestick chart and stock trading computer screen 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.

ARM (NASDAQ: ARM) shares are expensive and have just got even more so. The most recent rise puts the share price at $71 after being just $47 in October. 

If the Cambridge-based chip designer was listed in the UK, it would trade at one of the highest valuations on the London Stock Exchange.

XXX

Instead, ARM is listed on the other side of the Atlantic where stocks cost more. A lot more, in fact.  The S&P 500 average price-to-earnings (P/E) ratio is a whisker below 25 but some distance above the FTSE 100 at just 11. 

Yet even taking into account bigger American valuations, ARM still looks like its eye-wateringly pricey. It trades at over 150 times earnings and over 60 times forward earnings. 

Comparisons

It’s hard not to compare ARM to Nvidia (NASDAQ: NVDA). Nvidia is also in the electronic chips business and also flirts with triple-digit P/E ratios. Most importantly, Nvidia has been a terrific buy – up 14 times over the last five years despite seemingly crazy valuations.

There are two questions I’m interested in here. First, why are ARM shares so expensive? And second, could the firm enjoy Nvidia-like growth over the next few years? 

To circle back to Nvidia, the US giant’s growth has been driven by artificial intelligence (AI). Or rather, the prospect of a world where AI is at the heart of everything we do. 

Its share price surged thanks to investors wanting to get in on the ground floor of this technological revolution. 

Stolen a march

Nvidia has stolen a march on its competition. The firm’s $10,000 A100 microprocessor is used in 95% of current AI applications. Each time we type a question into Chat-GPT, chances are Nvidia’s GPUs are doing the grunt work. 

But Nvidia and ARM aren’t competitors. Without wanting to get too technical, the former’s focus is on making chips whereas ARM designs the architecture some chips are created with.  

In fact, Nvidia’s new GH200 Grace Hopper Superchip is based on ARM architecture and the US firm even bought a sizable stake in ARM at the IPO.

And while ARM has other routes to increasing earnings – notably a plan to bump up licensing fees on the use of its smartphone architecture – the expensive valuation comes, like Nvidia, with the prospect of an AI revolution. 

This is the core issue. If AI changes the world then 150 P/E ARM might look like a cheap buy. If the technology is a damp squib then weak profits would make the stock look even more expensive than it does now.

Unexplored territory

We’re in unexplored territory here, but my own view is cynical. AI applications might look exciting at first glance. I mean, who doesn’t want to ask a robot a question? Or create a picture out of thin air? 

But I haven’t seen any groundbreaking applications yet. It feels like we’re in an evolutionary phase rather than a revolutionary one with this technology.

I don’t doubt AI will improve or that one day machine learning will produce amazing things. But I’m investing for the next 10 or 20 years, not for another 100. I’ll keep ARM on my watchlist for now.

John Fieldsend has no position in any of the shares mentioned. The Motley Fool UK has recommended Nvidia. 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

Friends and sisters exploring the outdoors together in Cornwall. They are standing with their arms around each other at the coast.
Investing Articles

£503 buys 14 shares in this FTSE 250 stock that returned 23.9% annually for the last 15 years

This FTSE 250 stock has averaged a huge return for 15 years. At today's price, £503 buys 14 shares. But…

Read more »

Black woman using loudspeaker to be heard
Investing Articles

£1,000 buys 25 shares in this FTSE 100 stock that’s returned 29.2% annually for the last 10 years

This FTSE 100 mining stock has returned close to 30% a year for a decade. At 3,995p, £1,000 buys 25…

Read more »

Female student sitting at the steps and using laptop
Investing Articles

Down 47%, is this growth stock finally worth buying in May?

With a £288m order book and a hidden pipeline of defence and nuclear contracts, is this growth stock now too…

Read more »

House models and one with REIT - standing for real estate investment trust - written on it.
Investing Articles

2 REITs yielding 7%+ to consider for passive income in 2026

A REIT backed by the NHS and another backed by Tesco and Sainsbury's with both yielding 7%+. Here's why I'm…

Read more »

Woman riding her old fashioned bicycle along the Beach Esplanade at Aberdeen, Scotland.
Investing Articles

Just 97 shares of this UK dividend stock generate £238 in passive income

A 5.7% yield, £238 in passive income from just 97 shares, and one of the most divisive dividend stocks on…

Read more »

ISA coins
Investing Articles

£10,000 in an ISA generates a second income of…

The London Stock Exchange is home to some of the world's most generous dividends. But how big a second income…

Read more »

Shot of a senior man drinking coffee and looking thoughtfully out of a window
Investing Articles

Expert recommendations: 2 top income stocks yielding 7%+!

With yields of 7.2% and 7.8% respectively, these two income stocks are catching the eyes of institutional analysts. Should investors…

Read more »

Illustration of flames over a black background
Investing Articles

3 top income-focused stocks to buy in May 2026, according to experts

Looking for a stock to buy for income in May 2026? Experts have flagged these three UK dividend shares as…

Read more »