Despite an already strong run, Guangdong DP Co.,Ltd. (SZSE:300808) shares have been powering on, with a gain of 31% in the last thirty days. The last 30 days bring the annual gain to a very sharp 55%.

Since its price has surged higher, you could be forgiven for thinking Guangdong DPLtd is a stock to steer clear of with a price-to-sales ratios (or "P/S") of 9.7x, considering almost half the companies in China's Electrical industry have P/S ratios below 2.5x. However, the P/S might be quite high for a reason and it requires further investigation to determine if it's justified.

What Does Guangdong DPLtd's Recent Performance Look Like?

As an illustration, revenue has deteriorated at Guangdong DPLtd over the last year, which is not ideal at all. 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 Guangdong DPLtd's Revenue Growth Trending?

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

Taking a look back first, the company's revenue growth last year wasn't something to get excited about as it posted a disappointing decline of 16%. The last three years don't look nice either as the company has shrunk revenue by 41% in aggregate. 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 26% shows it's an unpleasant look.

With this in mind, we find it worrying that Guangdong DPLtd's P/S exceeds that of its industry peers. 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 Guangdong DPLtd's P/S

Guangdong DPLtd's P/S has grown nicely over the last month thanks to a handy boost in the share price. 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 Guangdong DPLtd 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. 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. Unless the recent medium-term conditions improve markedly, investors will have a hard time accepting the share price as fair value.

It is also worth noting that we have found 2 warning signs for Guangdong DPLtd (1 is potentially serious!) that you need to take into consideration.

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.