Koppers Holdings Inc.'s (NYSE:KOP) price-to-earnings (or "P/E") ratio of 12.6x 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 17x and even P/E's above 32x 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.

Koppers Holdings 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. One possibility is that the P/E is low because investors think the company's earnings are going to fall away like everyone else's soon. 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 out of favour.

If you'd like to see what analysts are forecasting going forward, you should check out our free report on Koppers Holdings.

Does Growth Match The Low P/E?

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

Retrospectively, the last year delivered an exceptional 40% gain to the company's bottom line. Still, incredibly EPS has fallen 1.8% in total from three years ago, which is quite disappointing. Accordingly, shareholders would have felt downbeat about the medium-term rates of earnings growth.

Turning to the outlook, the next year should generate growth of 6.0% as estimated by the dual analysts watching the company. With the market predicted to deliver 11% growth , the company is positioned for a weaker earnings result.

In light of this, it's understandable that Koppers Holdings' P/E sits below the majority of other companies. Apparently many shareholders weren't comfortable holding on while the company is potentially eyeing a less prosperous future.

The Bottom Line On Koppers Holdings' P/E

It's argued the price-to-earnings ratio is an inferior measure of value within certain industries, but it can be a powerful business sentiment indicator.

We've established that Koppers 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. It's hard to see the share price rising strongly in the near future under these circumstances.

You should always think about risks. Case in point, we've spotted 2 warning signs for Koppers Holdings you should be aware of, and 1 of them can't be ignored.

If P/E ratios interest you, you may wish to see this free collection of other companies with strong earnings growth and low P/E ratios.

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