When close to half the companies in the United States have price-to-earnings ratios (or "P/E's") above 18x, you may consider Copa Holdings, S.A. (NYSE:CPA) as a highly attractive investment with its 5.5x P/E ratio. Although, it's not wise to just take the P/E at face value as there may be an explanation why it's so limited.

With its earnings growth in positive territory compared to the declining earnings of most other companies, Copa Holdings has been doing quite well of late. It might be that many expect the strong earnings performance to degrade substantially, possibly more than the market, which has repressed the P/E. If not, then existing shareholders have reason to be quite optimistic about the future direction of the share price.

What Are Growth Metrics Telling Us About The Low P/E?

In order to justify its P/E ratio, Copa Holdings would need to produce anemic growth that's substantially trailing the market.

Retrospectively, the last year delivered an exceptional 87% gain to the company's bottom line. Although, its longer-term performance hasn't been as strong with three-year EPS growth being relatively non-existent overall. So it appears to us that the company has had a mixed result in terms of growing earnings over that time.

Turning to the outlook, the next three years should generate growth of 3.3% per annum as estimated by the analysts watching the company. With the market predicted to deliver 10% growth per annum, the company is positioned for a weaker earnings result.

In light of this, it's understandable that Copa Holdings' P/E sits below the majority of other companies. It seems most investors are expecting to see limited future growth and are only willing to pay a reduced amount for the stock.

The Final Word

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.

We've established that Copa Holdings maintains its low P/E on the weakness of its forecast growth being lower than the wider market, as expected. At this stage investors feel the potential for an improvement in earnings isn't great enough to justify a higher P/E ratio. Unless these conditions improve, they will continue to form a barrier for the share price around these levels.

Plus, you should also learn about these 2 warning signs we've spotted with Copa Holdings.

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.