GMS Inc.'s (NYSE:GMS) price-to-earnings (or "P/E") ratio of 16x might make it look like a buy right now compared to the market in the United States, where around half of the companies have P/E ratios above 20x and even P/E's above 36x 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 limited.

While the market has experienced earnings growth lately, GMS' earnings have gone into reverse gear, which is not great. The P/E is probably low because investors think this poor earnings performance isn't going to get any better. If this is the case, then existing shareholders will probably struggle to get excited about the future direction of the share price.

How Is GMS' Growth Trending?

GMS' P/E ratio would be typical for a company that's only expected to deliver limited growth, and importantly, perform worse than the market.

If we review the last year of earnings, dishearteningly the company's profits fell to the tune of 23%. Even so, admirably EPS has lifted 93% in aggregate from three years ago, notwithstanding the last 12 months. Accordingly, while they would have preferred to keep the run going, shareholders would probably welcome the medium-term rates of earnings growth.

Shifting to the future, estimates from the eight analysts covering the company suggest earnings growth is heading into negative territory, declining 2.3% over the next year. Meanwhile, the broader market is forecast to expand by 15%, which paints a poor picture.

In light of this, it's understandable that GMS' P/E would sit below the majority of other companies. However, shrinking earnings are unlikely to lead to a stable P/E over the longer term. There's potential for the P/E to fall to even lower levels if the company doesn't improve its profitability.

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.

As we suspected, our examination of GMS' analyst forecasts revealed that its outlook for shrinking earnings is contributing to its low P/E. At this stage investors feel the potential for an improvement in earnings isn't great enough to justify a higher P/E ratio. It's hard to see the share price rising strongly in the near future under these circumstances.

Before you take the next step, you should know about the 1 warning sign for GMS that we have uncovered.

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