SEC Electric Machinery Co., Ltd. (SHSE:603988) shares have retraced a considerable 26% in the last month, reversing a fair amount of their solid recent performance. The last month has meant the stock is now only up 7.5% during the last year.

In spite of the heavy fall in price, you could still be forgiven for thinking SEC Electric Machinery is a stock not worth researching with a price-to-sales ratios (or "P/S") of 3.5x, considering almost half the companies in China's Electrical industry have P/S ratios below 2.2x. 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 SEC Electric Machinery Performed Recently?

For instance, SEC Electric Machinery's receding revenue in recent times would have to be some food for thought. 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. However, if this isn't the case, investors might get caught out paying too much for the stock.

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

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

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 19%. As a result, revenue from three years ago have also fallen 22% overall. Accordingly, shareholders would have felt downbeat about the medium-term rates of revenue growth.

Comparing that to the industry, which is predicted to deliver 25% growth in the next 12 months, the company's downward momentum based on recent medium-term revenue results is a sobering picture.

With this information, we find it concerning that SEC Electric Machinery is trading at a P/S higher than the industry. 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 Bottom Line On SEC Electric Machinery's P/S

There's still some elevation in SEC Electric Machinery's P/S, even if the same can't be said for its share price recently. 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 SEC Electric Machinery currently trades on a much higher than expected P/S since its recent revenues have been in decline over the medium-term. Right now we aren't comfortable with the high P/S as this revenue performance is highly unlikely to support such positive sentiment for long. Unless the recent medium-term conditions improve markedly, investors will have a hard time accepting the share price as fair value.

Don't forget that there may be other risks. For instance, we've identified 3 warning signs for SEC Electric Machinery (2 are potentially serious) 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.