The Sundy Service Group Co. Ltd (HKG:9608) share price has done very well over the last month, posting an excellent gain of 36%. The last 30 days bring the annual gain to a very sharp 81%.

Following the firm bounce in price, Sundy Service Group may be sending very bearish signals at the moment with a price-to-earnings (or "P/E") ratio of 22.9x, since almost half of all companies in Hong Kong have P/E ratios under 9x and even P/E's lower than 4x are not unusual. However, the P/E might be quite high for a reason and it requires further investigation to determine if it's justified.

As an illustration, earnings have deteriorated at Sundy Service Group over the last year, which is not ideal at all. One possibility is that the P/E is high because investors think the company will still do enough to outperform the broader market in the near future. You'd really hope so, otherwise you're paying a pretty hefty price for no particular reason.

See our latest analysis for Sundy Service Group

Is There Enough Growth For Sundy Service Group?

The only time you'd be truly comfortable seeing a P/E as steep as Sundy Service Group's is when the company's growth is on track to outshine the market decidedly.

Taking a look back first, the company's earnings per share growth last year wasn't something to get excited about as it posted a disappointing decline of 64%. As a result, earnings from three years ago have also fallen 62% overall. Accordingly, shareholders would have felt downbeat about the medium-term rates of earnings growth.

Comparing that to the market, which is predicted to deliver 23% growth in the next 12 months, the company's downward momentum based on recent medium-term earnings results is a sobering picture.

In light of this, it's alarming that Sundy Service Group's 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.

The Final Word

The strong share price surge has got Sundy Service Group's 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.

We've established that Sundy Service Group currently trades on a much higher than expected P/E since its recent earnings have been in decline over the medium-term. Right now we are increasingly uncomfortable with the high P/E as this earnings performance is highly unlikely to support such positive sentiment for long. Unless the recent medium-term conditions improve markedly, it's very challenging to accept these prices as being reasonable.

Don't forget that there may be other risks. For instance, we've identified 4 warning signs for Sundy Service Group (1 shouldn't be ignored) you should be aware of.

You might be able to find a better investment than Sundy Service Group. 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.