Shanghai Prosolar Resources Development Co., Ltd (SHSE:600193) shareholders would be excited to see that the share price has had a great month, posting a 31% gain and recovering from prior weakness. Unfortunately, the gains of the last month did little to right the losses of the last year with the stock still down 27% over that time.

After such a large jump in price, when almost half of the companies in China's Metals and Mining industry have price-to-sales ratios (or "P/S") below 1.4x, you may consider Shanghai Prosolar Resources Development as a stock not worth researching with its 21x 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 so lofty.

How Has Shanghai Prosolar Resources Development Performed Recently?

For example, consider that Shanghai Prosolar Resources Development'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. If not, then existing shareholders may be quite nervous about the viability of the share price.

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

There's an inherent assumption that a company should far outperform the industry for P/S ratios like Shanghai Prosolar Resources Development's to be considered reasonable.

Retrospectively, the last year delivered a frustrating 63% decrease to the company's top line. As a result, revenue from three years ago have also fallen 92% overall. So unfortunately, we have to acknowledge that the company has not done a great job of growing revenue over that time.

Weighing that medium-term revenue trajectory against the broader industry's one-year forecast for expansion of 15% shows it's an unpleasant look.

With this in mind, we find it worrying that Shanghai Prosolar Resources Development's P/S exceeds that of its industry peers. 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 strong share price surge has lead to Shanghai Prosolar Resources Development's P/S soaring as well. While the price-to-sales ratio shouldn't be the defining factor in whether you buy a stock or not, it's quite a capable barometer of revenue expectations.

Our examination of Shanghai Prosolar Resources Development 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. 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.

And what about other risks? Every company has them, and we've spotted 2 warning signs for Shanghai Prosolar Resources Development (of which 1 is a bit concerning!) you should know about.

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.

Have feedback on this article? Concerned about the content? Get in touch with us directly. Alternatively, email editorial-team (at) simplywallst.com.
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.