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

The share price of my favourite FTSE 100 growth stock can’t stop falling. Time to buy?

Paul Summers loves the near-monopoly this FTSE 100 company enjoys. But he’s also concerned its shares have tumbled over 20% in just one month.

| More on:
Road trip. Father and son travelling together by car

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.

When a FTSE 100 stock can’t stop falling in value, I’ll always sit up and pay attention. And I’ll be particularly quick to do so if it happens to be one of the best growth stocks in the entire index. All in my Foolish opinion, of course.

Stuttering performance

Automotive marketplace giant Auto Trader (LSE: AUTO) has slumped over 20% in the last month alone. That’s a pretty terrible drop for a multi-billion pound business.

There seems to be a few things worrying the market. For one, analysts appear underwhelmed by the firm’s recent set of numbers.

Yes, group revenue and operating profit were up 5% and 6% respectively in the six months to the end of September. But a lack of upgrade to full-year guidance looks to have spooked some.

There is also concern over car dealers cancelling or downgrading their Auto Trader packages in protest at the site’s Deal Builder feature. This allows buyers to do the majority of the buying process online and includes taking a vehicle off-sale for a small fee.

Some dealers are concerned that this feature allows uncommitted buyers to tie up inventory and reduce customer leads. A danger is that this dissatisfaction could spread.

Quality FTSE 100 stock

Notwithstanding the recent wobble, Auto Trader still boasts many hallmarks of a quality business.

I often think of it as the Rightmove of its space. By this, I mean that it has a virtual monopoly in what it does. For example, over 75% of all minutes spent on automotive marketplaces were spent on its site in the aforementioned six-month period, at least according to Auto Trader.

Like the property portal mentioned, the firm’s online-only presence also means operating margins are among the highest you’ll see from a listed business.

But is it too expensive?

All that said, one long-running issue I’ve had with the shares is that they’re usually very expensive, at least compared to the FTSE 100 average. We’re talking about a price-to-earning (P/E) ratio in the high 20s.

Again, this goes some way to explaining why they’ve been hammered. Investors tend to get worried if highly-priced growth stocks might be underperforming.

The forecast P/E now stands at 17. That’s clearly a lot lower than where it once was. It might even prove a bargain in time if the company’s increasing use of AI opportunities, such as its Co-Driver product (which helps to make better adverts), serve to boost performance.

Nevertheless, it could be said that this reflects current conditions in the market. When times are tough, purchasing a new vehicle can usually be postponed.

According to my data provider, there’s been no director buying in the open market for a long time either. Ideally, I want those best-positioned to know how the £5bn-cap’s performing to be investing their own money into the business.

On the watchlist for now

On a more positive note, Auto Trader doesn’t seem to be subject to any attention from short sellers. That doesn’t mean the shares can’t fall further, of course. But it does mean that traders aren’t betting there’s more misery to come. Or, at least, enough misery to make a killing on.

With the outlook seeming foggy however, I’m content to add the stock to my fast-growing watchlist for now.

Paul Summers has no position in any of the shares mentioned. The Motley Fool UK has recommended Auto Trader Group Plc and Rightmove Plc. 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 Growth Shares

Aerial shot showing an aircraft shadow flying over an idyllic beach
Investing Articles

Why are investors flooding into IAG shares this week?

In the last week, investors have been snapping up IAG shares like there's no tomorrow. What could have sparked the…

Read more »

Little girl helping her Grandad plant tomatoes in a greenhouse in his garden.
Investing Articles

With single-digit P/E ratios, here are 3 of the FTSE 100’s cheapest-looking shares!

Only a few FTSE 100 shares are trading at single digit-multiples of earnings! And our Foolish author has highlighted what…

Read more »

Young female business analyst looking at a graph chart while working from home
Investing Articles

After Qatar cuts its stake in Sainsbury’s, is its share price now a great short-term risk/long-term reward play?

Sainsbury’s share price slid after Qatar cut its stake, but with a new activist investor at the helm, does it…

Read more »

Investing Articles

Down 20% but 15% annual earnings growth forecast — is BT’s share price a bargain or a bust going into 2026?

BT’s share price has fallen a long way since July, but analysts forecast strong earnings growth in the coming years,…

Read more »

Rolls-Royce's Pearl 10X engine series
Investing Articles

Will Rolls-Royce shares continue their epic run into 2026 and beyond?

Noting that differences of opinion make the world go round, James Beard discusses what might happen to Rolls-Royce’s shares next…

Read more »

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

I asked ChatGPT if I’ve left it too late to buy Lloyds shares. Here’s what it said…

James Beard turns to artificial intelligence in an attempt to assess whether there’s any value left in Lloyds Banking Group…

Read more »

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

How on earth is this FTSE 100 stock up 319% in 2025?

It's been a barnstormer of a year for FTSE 100 stocks, but one unheralded mining firm is massively outperforming the…

Read more »

Tesco employee helping female customer
Growth Shares

Here’s where the experts think the Tesco share price could finish next year

Jon Smith sets his sights on the Tesco share price direction for 2026 and muses over the forecasts being offered…

Read more »