Despite an already strong run, Sunway Co., Ltd. (SHSE:603333) shares have been powering on, with a gain of 26% in the last thirty days. Looking further back, the 13% rise over the last twelve months isn't too bad notwithstanding the strength over the last 30 days.

Although its price has surged higher, Sunway may still be sending bullish signals at the moment with its price-to-sales (or "P/S") ratio of 1.8x, since almost half of all companies in the Electrical industry in China have P/S ratios greater than 2.6x and even P/S higher than 5x are not unusual. Although, it's not wise to just take the P/S at face value as there may be an explanation why it's limited.

View our latest analysis for Sunway

How Sunway Has Been Performing

We'd have to say that with no tangible growth over the last year, Sunway's revenue has been unimpressive. One possibility is that the P/S is low because investors think this benign revenue growth rate will likely underperform the broader industry in the near future. Those who are bullish on Sunway will be hoping that this isn't the case, so that they can pick up the stock at a lower valuation.

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

In order to justify its P/S ratio, Sunway would need to produce sluggish growth that's trailing the industry.

If we review the last year of revenue, the company posted a result that saw barely any deviation from a year ago. The lack of growth did nothing to help the company's aggregate three-year performance, which is an unsavory 5.0% drop in revenue. Therefore, it's fair to say the revenue growth recently has been undesirable for the company.

Weighing that medium-term revenue trajectory against the broader industry's one-year forecast for expansion of 31% shows it's an unpleasant look.

In light of this, it's understandable that Sunway's P/S would sit below the majority of other companies. However, we think shrinking revenues are unlikely to lead to a stable P/S over the longer term, which could set up shareholders for future disappointment. There's potential for the P/S to fall to even lower levels if the company doesn't improve its top-line growth.

What Does Sunway's P/S Mean For Investors?

Despite Sunway's share price climbing recently, its P/S still lags most other companies. 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.

As we suspected, our examination of Sunway revealed its shrinking revenue over the medium-term is contributing to its low P/S, given the industry is set to grow. At this stage investors feel the potential for an improvement in revenue isn't great enough to justify a higher P/S ratio. If recent medium-term revenue trends continue, it's hard to see the share price moving strongly in either direction in the near future under these circumstances.

Before you take the next step, you should know about the 2 warning signs for Sunway (1 shouldn't be ignored!) that we have uncovered.

If these risks are making you reconsider your opinion on Sunway, explore our interactive list of high quality stocks to get an idea of what else is out there.

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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.