Hualan Group Co., Ltd. (SZSE:301027) shares have continued their recent momentum with a 28% gain in the last month alone. Longer-term shareholders would be thankful for the recovery in the share price since it's now virtually flat for the year after the recent bounce.

Following the firm bounce in price, when almost half of the companies in China's Construction industry have price-to-sales ratios (or "P/S") below 1.3x, you may consider Hualan Group as a stock probably not worth researching with its 3.1x P/S ratio. Although, it's not wise to just take the P/S at face value as there may be an explanation why it's as high as it is.

How Has Hualan Group Performed Recently?

For example, consider that Hualan Group's financial performance has been poor lately as its revenue has been in decline. 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?

In order to justify its P/S ratio, Hualan Group would need to produce impressive growth in excess of the industry.

Retrospectively, the last year delivered a frustrating 19% decrease to the company's top line. This means it has also seen a slide in revenue over the longer-term as revenue is down 48% in total over the last three years. Accordingly, shareholders would have felt downbeat about the medium-term rates of revenue growth.

In contrast to the company, the rest of the industry is expected to grow by 13% over the next year, which really puts the company's recent medium-term revenue decline into perspective.

With this information, we find it concerning that Hualan Group is trading at a P/S higher than the industry. 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 revenue trends is likely to weigh heavily on the share price eventually.

The Bottom Line On Hualan Group's P/S

The large bounce in Hualan Group's shares has lifted the company's P/S handsomely. 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.

We've established that Hualan Group currently trades on a much higher than expected P/S since its recent revenues have been in decline over the medium-term. 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. Should recent medium-term revenue trends persist, it would pose a significant risk to existing shareholders' investments and prospective investors will have a hard time accepting the current value of the stock.

Don't forget that there may be other risks. For instance, we've identified 3 warning signs for Hualan Group that you should be aware of.

If strong companies turning a profit tickle your fancy, then you'll want to 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.