Shanghai Guao Electronic Technology Co., Ltd. (SZSE:300551) shares have had a horrible month, losing 27% after a relatively good period beforehand. The drop over the last 30 days has capped off a tough year for shareholders, with the share price down 39% in that time.

Even after such a large drop in price, when almost half of the companies in China's Tech industry have price-to-sales ratios (or "P/S") below 3.9x, you may still consider Shanghai Guao Electronic Technology as a stock not worth researching with its 10.2x 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.

How Shanghai Guao Electronic Technology Has Been Performing

For instance, Shanghai Guao Electronic Technology's receding revenue in recent times would have to be some food for thought. 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. If not, then existing shareholders may be quite nervous about the viability of the share price.

How Is Shanghai Guao Electronic Technology's Revenue Growth Trending?

Shanghai Guao Electronic Technology'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, the company's revenue growth last year wasn't something to get excited about as it posted a disappointing decline of 43%. Even so, admirably revenue has lifted 35% in aggregate from three years ago, notwithstanding the last 12 months. Although it's been a bumpy ride, it's still fair to say the revenue growth recently has been more than adequate for the company.

This is in contrast to the rest of the industry, which is expected to grow by 17% over the next year, materially higher than the company's recent medium-term annualised growth rates.

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

What We Can Learn From Shanghai Guao Electronic Technology's P/S?

Even after such a strong price drop, Shanghai Guao Electronic Technology's P/S still exceeds the industry median significantly. 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.

Our examination of Shanghai Guao Electronic Technology revealed its poor three-year revenue trends aren't detracting from the P/S as much as we though, given they look worse than current industry expectations. Right now we aren't comfortable with the high P/S as this revenue performance isn't likely to support such positive sentiment for long. 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.

You should always think about risks. Case in point, we've spotted 2 warning signs for Shanghai Guao Electronic Technology you should be aware of.

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.