Yunnan Yunwei Company Limited's (SHSE:600725) price-to-sales (or "P/S") ratio of 3.8x may look like a poor investment opportunity when you consider close to half the companies in the Metals and Mining industry in China have P/S ratios below 1.4x. However, the P/S might be quite high for a reason and it requires further investigation to determine if it's justified.

How Has Yunnan Yunwei Performed Recently?

Yunnan Yunwei has been doing a good job lately as it's been growing revenue at a solid pace. One possibility is that the P/S ratio is high because investors think this respectable revenue growth will be enough to outperform the broader industry in the near future. However, if this isn't the case, investors might get caught out paying too much for the stock.

How Is Yunnan Yunwei's Revenue Growth Trending?

Yunnan Yunwei's P/S ratio would be typical for a company that's expected to deliver very strong growth, and importantly, perform much better than the industry.

Taking a look back first, we see that the company managed to grow revenues by a handy 11% last year. Ultimately though, it couldn't turn around the poor performance of the prior period, with revenue shrinking 46% in total over the last three years. Therefore, it's fair to say the revenue growth recently has been undesirable for the company.

Comparing that to the industry, which is predicted to deliver 13% 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 Yunnan Yunwei 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 Bottom Line On Yunnan Yunwei's P/S

We'd say the price-to-sales ratio's power isn't primarily as a valuation instrument but rather to gauge current investor sentiment and future expectations.

We've established that Yunnan Yunwei currently trades on a much higher than expected P/S since its recent revenues have been in decline over the medium-term. With a revenue decline on investors' minds, the likelihood of a souring sentiment is quite high which could send the P/S back in line with what we'd expect. If recent medium-term revenue trends continue, it will place shareholders' investments at significant risk and potential investors in danger of paying an excessive premium.

It's always necessary to consider the ever-present spectre of investment risk. We've identified 1 warning sign with Yunnan Yunwei, and understanding should be part of your investment process.

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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