With a median price-to-earnings (or "P/E") ratio of close to 18x in the United States, you could be forgiven for feeling indifferent about American Express Company's (NYSE:AXP) P/E ratio of 18.1x. While this might not raise any eyebrows, if the P/E ratio is not justified investors could be missing out on a potential opportunity or ignoring looming disappointment.

Recent times have been pleasing for American Express as its earnings have risen in spite of the market's earnings going into reverse. It might be that many expect the strong earnings performance to deteriorate like the rest, which has kept the P/E from rising. If you like the company, you'd be hoping this isn't the case so that you could potentially pick up some stock while it's not quite in favour.

Keen to find out how analysts think American Express' future stacks up against the industry? In that case, our free report is a great place to start.

How Is American Express' Growth Trending?

The only time you'd be comfortable seeing a P/E like American Express' is when the company's growth is tracking the market closely.

If we review the last year of earnings growth, the company posted a terrific increase of 36%. Pleasingly, EPS has also lifted 58% in aggregate from three years ago, thanks to the last 12 months of growth. Therefore, it's fair to say the earnings growth recently has been superb for the company.

Looking ahead now, EPS is anticipated to climb by 6.6% per annum during the coming three years according to the analysts following the company. That's shaping up to be materially lower than the 10% per annum growth forecast for the broader market.

With this information, we find it interesting that American Express is trading at a fairly similar P/E to the market. It seems most investors are ignoring the fairly limited growth expectations and are willing to pay up for exposure to the stock. Maintaining these prices will be difficult to achieve as this level of earnings growth is likely to weigh down the shares eventually.

The Key Takeaway

Using the price-to-earnings ratio alone to determine if you should sell your stock isn't sensible, however it can be a practical guide to the company's future prospects.

We've established that American Express currently trades on a higher than expected P/E since its forecast growth is lower than the wider market. Right now we are uncomfortable with the P/E as the predicted future earnings aren't likely to support a more positive sentiment for long. This places shareholders' investments at risk and potential investors in danger of paying an unnecessary premium.

Having said that, be aware American Express is showing 1 warning sign in our investment analysis, you should know about.

Of course, you might also be able to find a better stock than American Express. So you may wish to see this free collection of other companies that have reasonable P/E ratios and have grown earnings strongly.

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This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.

Have feedback on this article? Concerned about the content? Get in touch with us directly. Alternatively, email editorial-team@simplywallst.com