Zhejiang Jindun Fans Co., Ltd (SZSE:300411) shareholders won't be pleased to see that the share price has had a very rough month, dropping 28% and undoing the prior period's positive performance. Instead of being rewarded, shareholders who have already held through the last twelve months are now sitting on a 25% share price drop.

In spite of the heavy fall in price, given around half the companies in China's Machinery industry have price-to-sales ratios (or "P/S") below 2.5x, you may still consider Zhejiang Jindun Fans as a stock to avoid entirely with its 4.9x P/S ratio. Nonetheless, we'd need to dig a little deeper to determine if there is a rational basis for the highly elevated P/S.

How Has Zhejiang Jindun Fans Performed Recently?

For example, consider that Zhejiang Jindun Fans' 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. However, if this isn't the case, investors might get caught out paying too much for the stock.

How Is Zhejiang Jindun Fans' Revenue Growth Trending?

The only time you'd be truly comfortable seeing a P/S as steep as Zhejiang Jindun Fans' is when the company's growth is on track to outshine the industry decidedly.

Retrospectively, the last year delivered a frustrating 2.2% 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 34% in total over the last three years. Accordingly, shareholders would have felt downbeat about the medium-term rates of revenue growth.

Comparing that to the industry, which is predicted to deliver 28% growth in the next 12 months, the company's downward momentum based on recent medium-term revenue results is a sobering picture.

With this information, we find it concerning that Zhejiang Jindun Fans is trading at a P/S higher than the industry. 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.

The Final Word

Even after such a strong price drop, Zhejiang Jindun Fans' P/S still exceeds the industry median significantly. 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 Zhejiang Jindun Fans 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.

Many other vital risk factors can be found on the company's balance sheet. Our free balance sheet analysis for Zhejiang Jindun Fans with six simple checks will allow you to discover any risks that could be an issue.

Of course, profitable companies with a history of great earnings growth are generally safer bets. So you may wish to see this free collection of other companies that have reasonable P/E ratios and have grown earnings strongly.

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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.