The iDreamSky Technology Holdings Limited (HKG:1119) share price has done very well over the last month, posting an excellent gain of 26%. Unfortunately, despite the strong performance over the last month, the full year gain of 3.8% isn't as attractive.

Since its price has surged higher, you could be forgiven for thinking iDreamSky Technology Holdings is a stock not worth researching with a price-to-sales ratios (or "P/S") of 2.5x, considering almost half the companies in Hong Kong's Entertainment industry have P/S ratios below 1.5x. Although, it's not wise to just take the P/S at face value as there may be an explanation why it's as high as it is.

How Has iDreamSky Technology Holdings Performed Recently?

For example, consider that iDreamSky Technology Holdings' financial performance has been poor lately as its revenue has been in decline. One possibility is that the P/S is high because investors think the company will still do enough to outperform the broader industry in the near future. You'd really hope so, otherwise you're paying a pretty hefty price for no particular reason.

Do Revenue Forecasts Match The High P/S Ratio?

The only time you'd be truly comfortable seeing a P/S as high as iDreamSky Technology Holdings' is when the company's growth is on track to outshine the industry.

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 29%. The last three years don't look nice either as the company has shrunk revenue by 45% in aggregate. Accordingly, shareholders would have felt downbeat about the medium-term rates of revenue growth.

Weighing that medium-term revenue trajectory against the broader industry's one-year forecast for expansion of 13% shows it's an unpleasant look.

With this information, we find it concerning that iDreamSky Technology Holdings is trading at a P/S higher than the industry. 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.

What We Can Learn From iDreamSky Technology Holdings' P/S?

The large bounce in iDreamSky Technology Holdings' shares has lifted the company's P/S handsomely. 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 iDreamSky Technology Holdings 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.

You should always think about risks. Case in point, we've spotted 2 warning signs for iDreamSky Technology Holdings you should be aware of, and 1 of them can't be ignored.

If strong companies turning a profit tickle your fancy, then you'll want to check out this free list of interesting companies that trade on a low P/E (but have proven they can grow earnings).

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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.