The Nanjing Quanxin Cable Technology Co., Ltd. (SZSE:300447) share price has fared very poorly over the last month, falling by a substantial 26%. Instead of being rewarded, shareholders who have already held through the last twelve months are now sitting on a 37% share price drop.

Following the heavy fall in price, Nanjing Quanxin Cable Technology's price-to-earnings (or "P/E") ratio of 22.5x might make it look like a buy right now compared to the market in China, where around half of the companies have P/E ratios above 30x and even P/E's above 54x are quite common. However, the P/E might be low for a reason and it requires further investigation to determine if it's justified.

As an illustration, earnings have deteriorated at Nanjing Quanxin Cable Technology over the last year, which is not ideal at all. One possibility is that the P/E is low because investors think the company won't do enough to avoid underperforming the broader market in the near future. If you like the company, you'd be hoping this isn't the case so that you could potentially pick up some stock while it's out of favour.

Check out our latest analysis for Nanjing Quanxin Cable Technology

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

The only time you'd be truly comfortable seeing a P/E as low as Nanjing Quanxin Cable Technology's is when the company's growth is on track to lag the market.

Taking a look back first, the company's earnings per share growth last year wasn't something to get excited about as it posted a disappointing decline of 26%. This means it has also seen a slide in earnings over the longer-term as EPS is down 2.7% in total over the last three years. Therefore, it's fair to say the earnings growth recently has been undesirable for the company.

Weighing that medium-term earnings trajectory against the broader market's one-year forecast for expansion of 42% shows it's an unpleasant look.

In light of this, it's understandable that Nanjing Quanxin Cable Technology's P/E would sit below the majority of other companies. However, we think shrinking earnings are unlikely to lead to a stable P/E over the longer term, which could set up shareholders for future disappointment. Even just maintaining these prices could be difficult to achieve as recent earnings trends are already weighing down the shares.

The Final Word

Nanjing Quanxin Cable Technology's recently weak share price has pulled its P/E below most other companies. We'd say the price-to-earnings ratio's power isn't primarily as a valuation instrument but rather to gauge current investor sentiment and future expectations.

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

The company's balance sheet is another key area for risk analysis. Take a look at our free balance sheet analysis for Nanjing Quanxin Cable Technology with six simple checks on some of these key factors.

It's important to make sure you look for a great company, not just the first idea you come across. So 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.