Those holding Hailun Piano Co.,Ltd. (SZSE:300329) shares would be relieved that the share price has rebounded 35% in the last thirty days, but it needs to keep going to repair the recent damage it has caused to investor portfolios. Not all shareholders will be feeling jubilant, since the share price is still down a very disappointing 27% in the last twelve months.

Since its price has surged higher, given close to half the companies operating in China's Leisure industry have price-to-sales ratios (or "P/S") below 3.4x, you may consider Hailun PianoLtd as a stock to potentially avoid with its 4.1x P/S ratio. Nonetheless, we'd need to dig a little deeper to determine if there is a rational basis for the elevated P/S.

How Hailun PianoLtd Has Been Performing

For instance, Hailun PianoLtd's receding revenue in recent times would have to be some food for thought. It might be that many expect the company to still outplay most other companies over the coming period, which has kept the P/S from collapsing. You'd really hope so, otherwise you're paying a pretty hefty price for no particular reason.

What Are Revenue Growth Metrics Telling Us About The High P/S?

The only time you'd be truly comfortable seeing a P/S as high as Hailun PianoLtd's is when the company's growth is on track to outshine the industry.

Taking a look back first, the company's revenue growth last year wasn't something to get excited about as it posted a disappointing decline of 27%. The last three years don't look nice either as the company has shrunk revenue by 34% in aggregate. So unfortunately, we have to acknowledge that the company has not done a great job of growing revenue over that time.

In contrast to the company, the rest of the industry is expected to grow by 19% over the next year, which really puts the company's recent medium-term revenue decline into perspective.

In light of this, it's alarming that Hailun PianoLtd's P/S sits above the majority of other companies. It seems most investors are ignoring the recent poor growth rate and are hoping for a turnaround in the company's business prospects. Only the boldest would assume these prices are sustainable as a continuation of recent revenue trends is likely to weigh heavily on the share price eventually.

What We Can Learn From Hailun PianoLtd's P/S?

Hailun PianoLtd shares have taken a big step in a northerly direction, but its P/S is elevated as a result. Using the price-to-sales ratio alone to determine if you should sell your stock isn't sensible, however it can be a practical guide to the company's future prospects.

Our examination of Hailun PianoLtd revealed its shrinking revenue over the medium-term isn't resulting in a P/S as low as we expected, given the industry is set to grow. When we see revenue heading backwards and underperforming the industry forecasts, we feel the possibility of the share price declining is very real, bringing the P/S back into the realm of reasonability. Unless the the circumstances surrounding the recent medium-term improve, it wouldn't be wrong to expect a a difficult period ahead for the company's shareholders.

You should always think about risks. Case in point, we've spotted 3 warning signs for Hailun PianoLtd you should be aware of, and 1 of them doesn't sit too well with us.

If companies with solid past earnings growth is up your alley, you may wish to see this free collection of other companies with strong earnings growth and low P/E ratios.

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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.