F5, Inc.'s (NASDAQ:FFIV) price-to-earnings (or "P/E") ratio of 20.6x might make it look like a sell right now compared to the market in the United States, where around half of the companies have P/E ratios below 17x and even P/E's below 10x are quite common. However, the P/E might be high for a reason and it requires further investigation to determine if it's justified.

F5 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. It seems that many are expecting the company to continue defying the broader market adversity, which has increased investors' willingness to pay up for the stock. You'd really hope so, otherwise you're paying a pretty hefty price for no particular reason.

Want the full picture on analyst estimates for the company? Then our free report on F5 will help you uncover what's on the horizon.

How Is F5's Growth Trending?

The only time you'd be truly comfortable seeing a P/E as high as F5's is when the company's growth is on track to outshine the market.

If we review the last year of earnings growth, the company posted a terrific increase of 70%. The latest three year period has also seen an excellent 94% 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 analysts covering the company suggest earnings should grow by 12% per year over the next three years. With the market predicted to deliver 10% growth per annum, the company is positioned for a comparable earnings result.

With this information, we find it interesting that F5 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 F5's P/E?

Generally, our preference is to limit the use of the price-to-earnings ratio to establishing what the market thinks about the overall health of a company.

Our examination of F5's analyst forecasts revealed that its market-matching earnings outlook isn't impacting its high P/E as much as we would have predicted. Right now we are uncomfortable with the relatively high share price as the predicted future earnings aren't likely to support such positive sentiment for long. Unless these conditions improve, it's challenging to accept these prices as being reasonable.

A lot of potential risks can sit within a company's balance sheet. Take a look at our free balance sheet analysis for F5 with six simple checks on some of these key factors.

If you're unsure about the strength of F5's business, why not explore our interactive list of stocks with solid business fundamentals for some other companies you may have missed.

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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.