There wouldn't be many who think Innospec Inc.'s (NASDAQ:IOSP) price-to-earnings (or "P/E") ratio of 20.8x is worth a mention when the median P/E in the United States is similar at about 19x. Although, it's not wise to simply ignore the P/E without explanation as investors may be disregarding a distinct opportunity or a costly mistake.

Recent times have been advantageous for Innospec as its earnings have been rising faster than most other companies. It might be that many expect the strong earnings performance to wane, 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.

Does Growth Match The P/E?

There's an inherent assumption that a company should be matching the market for P/E ratios like Innospec's to be considered reasonable.

Taking a look back first, we see that the company managed to grow earnings per share by a handy 13% last year. The latest three year period has also seen an excellent 55% overall rise in EPS, aided somewhat 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 three analysts covering the company suggest earnings should grow by 0.5% over the next year. Meanwhile, the rest of the market is forecast to expand by 15%, which is noticeably more attractive.

With this information, we find it interesting that Innospec is trading at a fairly similar P/E to the market. Apparently many investors in the company are less bearish than analysts indicate and aren't willing to let go of their stock right now. These shareholders may be setting themselves up for future disappointment if the P/E falls to levels more in line with the growth outlook.

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.

Our examination of Innospec's analyst forecasts revealed that its inferior earnings outlook isn't impacting its P/E as much as we would have predicted. 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. Unless these conditions improve, it's challenging to accept these prices as being reasonable.

It's always necessary to consider the ever-present spectre of investment risk. We've identified 1 warning sign with Innospec, and understanding should be part of your investment process.

If these risks are making you reconsider your opinion on Innospec, 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.