Despite an already strong run, Hynar Water Group Co., Ltd. (SZSE:300961) shares have been powering on, with a gain of 33% in the last thirty days. Looking further back, the 20% rise over the last twelve months isn't too bad notwithstanding the strength over the last 30 days.

After such a large jump in price, given close to half the companies operating in China's Commercial Services industry have price-to-sales ratios (or "P/S") below 3.4x, you may consider Hynar Water Group as a stock to potentially avoid with its 5.2x 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.

What Does Hynar Water Group's Recent Performance Look Like?

For example, consider that Hynar Water Group's financial performance has been poor lately as its revenue has been in decline. Perhaps the market believes the company can do enough to outperform the rest of the industry in the near future, which is keeping the P/S ratio high. You'd really hope so, otherwise you're paying a pretty hefty price for no particular reason.

Do Revenue Forecasts Match The High P/S Ratio?

There's an inherent assumption that a company should outperform the industry for P/S ratios like Hynar Water Group's to be considered reasonable.

Retrospectively, the last year delivered a frustrating 2.3% 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 29% in total over the last three years. Therefore, it's fair to say the revenue growth recently has been undesirable for the company.

In contrast to the company, the rest of the industry is expected to grow by 35% 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 Hynar Water 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 Final Word

The large bounce in Hynar Water 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.

Our examination of Hynar Water Group 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. Right now we aren't comfortable with the high P/S as this revenue performance is highly unlikely to support such positive sentiment for long. 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.

Having said that, be aware Hynar Water Group is showing 3 warning signs in our investment analysis, you should know about.

It's important to make sure you look for a great company, not just the first idea you come across. So if growing profitability aligns with your idea of a great company, take a peek at this free list of interesting companies with strong recent earnings growth (and a low P/E).

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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.