Waters Corporation's (NYSE:WAT) price-to-earnings (or "P/E") ratio of 30.5x might make it look like a strong sell right now compared to the market in the United States, where around half of the companies have P/E ratios below 16x 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.

Waters has been struggling lately as its earnings have declined faster than most other companies. It might be that many expect the dismal earnings performance to recover substantially, which has kept the P/E from collapsing. If not, then existing shareholders may be very nervous about the viability of the share price.

How Is Waters' Growth Trending?

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

Retrospectively, the last year delivered a frustrating 7.9% decrease to the company's bottom line. That put a dampener on the good run it was having over the longer-term as its three-year EPS growth is still a noteworthy 29% in total. So we can start by confirming that the company has generally done a good job of growing earnings over that time, even though it had some hiccups along the way.

Turning to the outlook, the next three years should generate growth of 8.0% per year as estimated by the analysts watching the company. With the market predicted to deliver 10% growth per year, the company is positioned for a weaker earnings result.

With this information, we find it concerning that Waters is trading at a P/E higher than the market. Apparently many investors in the company are way more bullish than analysts indicate and aren't willing to let go of their stock at any price. There's a good chance these shareholders are 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 Waters' analyst forecasts revealed that its inferior earnings outlook isn't impacting its high P/E anywhere near as much as we would have predicted. When we see a weak earnings outlook with slower than market growth, we suspect the share price is at risk of declining, sending the high P/E lower. This places shareholders' investments at significant risk and potential investors in danger of paying an excessive premium.

You should always think about risks. Case in point, we've spotted 1 warning sign for Waters you should be aware of.

Of course, you might find a fantastic investment by looking at a few good candidates. So take a peek at this free list of companies with a strong growth track record, trading on a low P/E.

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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.