Despite an already strong run, Modine Manufacturing Company (NYSE:MOD) shares have been powering on, with a gain of 26% in the last thirty days. The last month tops off a massive increase of 237% in the last year.

Since its price has surged higher, Modine Manufacturing's price-to-earnings (or "P/E") ratio of 18.9x might make it look like a 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 as high as it is.

Recent times have been pleasing for Modine Manufacturing as its earnings have risen in spite of the market's earnings going into reverse. The P/E is probably high because investors think the company will continue to navigate the broader market headwinds better than most. If not, then existing shareholders might be a little nervous about the viability of the share price.

Does Growth Match The High P/E?

In order to justify its P/E ratio, Modine Manufacturing would need to produce impressive growth in excess of the market.

Taking a look back first, we see that the company grew earnings per share by an impressive 214% last year. However, the latest three year period hasn't been as great in aggregate as it didn't manage to provide any growth at all. Accordingly, shareholders probably wouldn't have been overly satisfied with the unstable medium-term growth rates.

Turning to the outlook, the next year should bring diminished returns, with earnings decreasing 20% as estimated by the four analysts watching the company. Meanwhile, the broader market is forecast to expand by 13%, which paints a poor picture.

In light of this, it's alarming that Modine Manufacturing's P/E sits above the majority of other companies. Apparently many investors in the company reject the analyst cohort's pessimism and aren't willing to let go of their stock at any price. There's a very good chance these shareholders are setting themselves up for future disappointment if the P/E falls to levels more in line with the negative growth outlook.

The Final Word

Modine Manufacturing's P/E is getting right up there since its shares have risen strongly. 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 Modine Manufacturing currently trades on a much higher than expected P/E for a company whose earnings are forecast to decline. Right now we are increasingly uncomfortable with the high P/E as the predicted future earnings are highly unlikely to support such positive sentiment for long. This places shareholders' investments at significant risk and potential investors in danger of paying an excessive premium.

Plus, you should also learn about this 1 warning sign we've spotted with Modine Manufacturing.

You might be able to find a better investment than Modine Manufacturing. If you want a selection of possible candidates, check out this free list of interesting companies that trade on a low P/E (but have proven they can grow earnings).

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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.