Some Shareholders Feeling Restless Over Diploma PLC's (LON:DPLM) P/E Ratio

Diploma PLC's (LON:DPLM) price-to-earnings (or "P/E") ratio of 38.1x might make it look like a strong sell right now compared to the market in the United Kingdom, where around half of the companies have P/E ratios below 15x and even P/E's below 9x are quite common. Although, it's not wise to just take the P/E at face value as there may be an explanation why it's so lofty.

Diploma certainly has been doing a good job lately as its earnings growth has been positive while most other companies have been seeing their earnings go backwards. The P/E is probably high because investors think the company will continue to navigate the broader market headwinds better than most. If not, then existing shareholders might be a little nervous about the viability of the share price.

See our latest analysis for Diploma

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How Is Diploma's Growth Trending?

In order to justify its P/E ratio, Diploma would need to produce outstanding growth well in excess of the market.

Retrospectively, the last year delivered an exceptional 19% gain to the company's bottom line. The latest three year period has also seen an excellent 102% overall rise in EPS, aided by its short-term performance. So we can start by confirming that the company has done a great job of growing earnings over that time.

Shifting to the future, estimates from the ten analysts covering the company suggest earnings should grow by 12% per year over the next three years. With the market predicted to deliver 13% growth each year, the company is positioned for a comparable earnings result.

With this information, we find it interesting that Diploma is trading at a high P/E compared to the market. It seems most investors are ignoring the fairly average growth expectations and are willing to pay up for exposure to the stock. These shareholders may be setting themselves up for disappointment if the P/E falls to levels more in line with the growth outlook.

What We Can Learn From Diploma's P/E?

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.

Our examination of Diploma's analyst forecasts revealed that its market-matching earnings outlook isn't impacting its high P/E as much as we would have predicted. When we see an average earnings outlook with market-like growth, we suspect the share price is at risk of declining, sending the high P/E lower. This places shareholders' investments at risk and potential investors in danger of paying an unnecessary premium.

Don't forget that there may be other risks. For instance, we've identified 1 warning sign for Diploma that you should be aware of.

If P/E ratios interest you, you may wish to see this free collection of other companies with strong earnings growth and low P/E ratios.

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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.