Those holding Huizhong Instrumentation Co., Ltd. (SZSE:300371) shares would be relieved that the share price has rebounded 27% in the last thirty days, but it needs to keep going to repair the recent damage it has caused to investor portfolios. Not all shareholders will be feeling jubilant, since the share price is still down a very disappointing 35% in the last twelve months.

Even after such a large jump in price, given about half the companies in China have price-to-earnings ratios (or "P/E's") above 28x, you may still consider Huizhong Instrumentation as an attractive investment with its 18.7x P/E ratio. 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 Huizhong Instrumentation over the last year, which is not ideal at all. It might be that many expect the disappointing earnings performance to continue or accelerate, which has repressed the P/E. However, if this doesn't eventuate then existing shareholders may be feeling optimistic about the future direction of the share price.

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 Huizhong Instrumentation's is when the company's growth is on track to lag the market.

If we review the last year of earnings, dishearteningly the company's profits fell to the tune of 8.2%. This means it has also seen a slide in earnings over the longer-term as EPS is down 20% in total over the last three years. Accordingly, shareholders would have felt downbeat about the medium-term rates of earnings growth.

Weighing that medium-term earnings trajectory against the broader market's one-year forecast for expansion of 36% shows it's an unpleasant look.

With this information, we are not surprised that Huizhong Instrumentation is trading at a P/E lower than the market. 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 Key Takeaway

Despite Huizhong Instrumentation's shares building up a head of steam, its P/E still lags 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 Huizhong Instrumentation 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.

Don't forget that there may be other risks. For instance, we've identified 2 warning signs for Huizhong Instrumentation that you should be aware of.

Of course, you might find a fantastic investment by looking at a few good candidates. So take a peek at this free list of companies with a strong growth track record, trading on 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.