When you see that almost half of the companies in the Machinery industry in China have price-to-sales ratios (or "P/S") below 2.4x, Aurora Optoelectronics Co.,Ltd. (SHSE:600666) looks to be giving off strong sell signals with its 8.3x 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.

What Does Aurora OptoelectronicsLtd's Recent Performance Look Like?

Aurora OptoelectronicsLtd has been doing a good job lately as it's been growing revenue at a solid pace. Perhaps the market is expecting this decent revenue performance to beat out the industry over the near term, which has kept the P/S propped up. If not, then existing shareholders may be a little nervous about the viability of the share price.

Do Revenue Forecasts Match The High P/S Ratio?

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

If we review the last year of revenue growth, the company posted a terrific increase of 17%. Despite this strong recent growth, it's still struggling to catch up as its three-year revenue frustratingly shrank by 37% overall. 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 22% shows it's an unpleasant look.

In light of this, it's alarming that Aurora OptoelectronicsLtd's P/S sits above the majority of other companies. It seems most investors are ignoring the recent poor growth rate and are hoping for a turnaround in the company's business prospects. There's a very good chance existing shareholders are setting themselves up for future disappointment if the P/S falls to levels more in line with the recent negative growth rates.

The Final Word

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.

Our examination of Aurora OptoelectronicsLtd 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 1 warning sign for Aurora OptoelectronicsLtd that you need to take into consideration.

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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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.