The Smart City Development Holdings Limited (HKG:8268) share price has done very well over the last month, posting an excellent gain of 29%. The last 30 days bring the annual gain to a very sharp 100%.

Following the firm bounce in price, Smart City Development Holdings' price-to-earnings (or "P/E") ratio of 22.9x might make it look like a strong sell right now compared to the market in Hong Kong, where around half of the companies have P/E ratios below 9x and even P/E's below 4x 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 so lofty.

As an illustration, earnings have deteriorated at Smart City Development Holdings over the last year, which is not ideal at all. It might be that many expect the company to still outplay most other companies over the coming period, which has kept the P/E from collapsing. If not, then existing shareholders may be quite nervous about the viability of the share price.

Check out our latest analysis for Smart City Development Holdings

How Is Smart City Development Holdings' Growth Trending?

There's an inherent assumption that a company should far outperform the market for P/E ratios like Smart City Development Holdings' to be considered reasonable.

Retrospectively, the last year delivered a frustrating 26% decrease to the company's bottom line. At least EPS has managed not to go completely backwards from three years ago in aggregate, thanks to the earlier period of growth. Accordingly, shareholders probably wouldn't have been overly satisfied with the unstable medium-term growth rates.

Weighing that recent medium-term earnings trajectory against the broader market's one-year forecast for expansion of 22% shows it's noticeably less attractive on an annualised basis.

In light of this, it's alarming that Smart City Development Holdings' P/E sits above the majority of other companies. Apparently many investors in the company are way more bullish than recent times would indicate and aren't willing to let go of their stock at any price. Only the boldest would assume these prices are sustainable as a continuation of recent earnings trends is likely to weigh heavily on the share price eventually.

What We Can Learn From Smart City Development Holdings' P/E?

The strong share price surge has got Smart City Development Holdings' P/E rushing to great heights as well. 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.

Our examination of Smart City Development Holdings revealed its three-year earnings trends aren't impacting its high P/E anywhere near as much as we would have predicted, given they look worse than current market expectations. Right now we are increasingly uncomfortable with the high P/E as this earnings performance isn't likely to support such positive sentiment for long. If recent medium-term earnings trends continue, it will place shareholders' investments at significant risk and potential investors in danger of paying an excessive premium.

It is also worth noting that we have found 4 warning signs for Smart City Development Holdings (1 makes us a bit uncomfortable!) that you need to take into consideration.

Of course, you might also be able to find a better stock than Smart City Development Holdings. So you may wish to see this free collection of other companies that sit on P/E's below 20x and have grown earnings strongly.

Have feedback on this article? Concerned about the content? Get in touch with us directly. Alternatively, email editorial-team (at) simplywallst.com.
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.