Rockwell Automation, Inc.'s (NYSE:ROK) price-to-earnings (or "P/E") ratio of 24.6x 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. Nonetheless, we'd need to dig a little deeper to determine if there is a rational basis for the elevated P/E.

Rockwell Automation has been struggling lately as its earnings have declined faster than most other companies. One possibility is that the P/E is high because investors think the company will turn things around completely and accelerate past most others in the market. You'd really hope so, otherwise you're paying a pretty hefty price for no particular reason.

Does Growth Match The High P/E?

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

Retrospectively, the last year delivered a frustrating 9.9% decrease to the company's bottom line. The last three years don't look nice either as the company has shrunk EPS by 24% in aggregate. So unfortunately, we have to acknowledge that the company has not done a great job of growing earnings over that time.

Looking ahead now, EPS is anticipated to climb by 13% per annum during the coming three years according to the analysts following the company. That's shaping up to be materially higher than the 9.9% per annum growth forecast for the broader market.

With this information, we can see why Rockwell Automation is trading at such a high P/E compared to the market. It seems most investors are expecting this strong future growth and are willing to pay more for the stock.

The Final Word

While the price-to-earnings ratio shouldn't be the defining factor in whether you buy a stock or not, it's quite a capable barometer of earnings expectations.

As we suspected, our examination of Rockwell Automation's analyst forecasts revealed that its superior earnings outlook is contributing to its high P/E. Right now shareholders are comfortable with the P/E as they are quite confident future earnings aren't under threat. Unless these conditions change, they will continue to provide strong support to the share price.

It is also worth noting that we have found 1 warning sign for Rockwell Automation that you need to take into consideration.

It's important to make sure you look for a great company, not just the first idea you come across. So take a peek at this free list of interesting companies with strong recent earnings growth (and 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.

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