PTC Inc.'s (NASDAQ:PTC) price-to-earnings (or "P/E") ratio of 70.6x might make it look like a strong sell right now compared to the market in the United States, where around half of the companies have P/E ratios below 17x and even P/E's below 10x are quite common. Nonetheless, we'd need to dig a little deeper to determine if there is a rational basis for the highly elevated P/E.

With earnings that are retreating more than the market's of late, PTC has been very sluggish. It might be that many expect the dismal earnings performance to recover substantially, which has kept the P/E from collapsing. You'd really hope so, otherwise you're paying a pretty hefty price for no particular reason.

Want the full picture on analyst estimates for the company? Then our free report on PTC will help you uncover what's on the horizon.

How Is PTC's Growth Trending?

PTC's P/E ratio would be typical for a company that's expected to deliver very strong growth, and importantly, perform much better than the market.

Retrospectively, the last year delivered a frustrating 4.8% decrease to the company's bottom line. That put a dampener on the good run it was having over the longer-term as its three-year EPS growth is still a noteworthy 21% in total. Accordingly, while they would have preferred to keep the run going, shareholders would be roughly satisfied with the medium-term rates of earnings growth.

Looking ahead now, EPS is anticipated to climb by 35% per annum during the coming three years according to the analysts following the company. With the market only predicted to deliver 10% each year, the company is positioned for a stronger earnings result.

In light of this, it's understandable that PTC's P/E sits above the majority of other companies. It seems most investors are expecting this strong future growth and are willing to pay more for the stock.

What We Can Learn From PTC's P/E?

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 PTC'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. It's hard to see the share price falling strongly in the near future under these circumstances.

You should always think about risks. Case in point, we've spotted 2 warning signs for PTC you should be aware of.

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