When close to half the companies in the United States have price-to-earnings ratios (or "P/E's") below 18x, you may consider A10 Networks, Inc. (NYSE:ATEN) as a stock to avoid entirely with its 27.5x P/E ratio. Nonetheless, we'd need to dig a little deeper to determine if there is a rational basis for the highly elevated P/E.

A10 Networks certainly has been doing a good job lately as it's been growing earnings more than most other companies. The P/E is probably high because investors think this strong earnings performance will continue. You'd really hope so, otherwise you're paying a pretty hefty price for no particular reason.

How Is A10 Networks' Growth Trending?

A10 Networks' P/E ratio would be typical for a company that's expected to deliver very strong growth, and importantly, perform much better than the market.

If we review the last year of earnings growth, the company posted a terrific increase of 24%. However, this wasn't enough as the latest three year period has seen a very unpleasant 44% drop in EPS in aggregate. Therefore, it's fair to say the earnings growth recently has been undesirable for the company.

Looking ahead now, EPS is anticipated to slump, contracting by 7.9% during the coming year according to the four analysts following the company. Meanwhile, the broader market is forecast to expand by 15%, which paints a poor picture.

With this information, we find it concerning that A10 Networks is trading at a P/E higher than the market. Apparently many investors in the company reject the analyst cohort's pessimism and aren't willing to let go of their stock at any price. There's a very good chance these shareholders are setting themselves up for future disappointment if the P/E falls to levels more in line with the negative growth outlook.

What We Can Learn From A10 Networks' P/E?

Typically, we'd caution against reading too much into price-to-earnings ratios when settling on investment decisions, though it can reveal plenty about what other market participants think about the company.

Our examination of A10 Networks' analyst forecasts revealed that its outlook for shrinking earnings isn't impacting its high P/E anywhere near as much as we would have predicted. When we see a poor outlook with earnings heading backwards, we suspect the share price is at risk of declining, sending the high P/E lower. Unless these conditions improve markedly, it's very challenging to accept these prices as being reasonable.

The company's balance sheet is another key area for risk analysis. You can assess many of the main risks through our free balance sheet analysis for A10 Networks with six simple checks.

If these risks are making you reconsider your opinion on A10 Networks, explore our interactive list of high quality stocks to get an idea of what else is out there.

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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.