Those holding Swancor Advanced Materials Co., Ltd. (SHSE:688585) shares would be relieved that the share price has rebounded 32% in the last thirty days, but it needs to keep going to repair the recent damage it has caused to investor portfolios. Unfortunately, the gains of the last month did little to right the losses of the last year with the stock still down 38% over that time.

In spite of the firm bounce in price, given about half the companies in China have price-to-earnings ratios (or "P/E's") above 30x, you may still consider Swancor Advanced Materials as an attractive investment with its 27x P/E ratio. However, the P/E might be low for a reason and it requires further investigation to determine if it's justified.

Swancor Advanced Materials certainly has been doing a great job lately as it's been growing earnings at a really rapid pace. One possibility is that the P/E is low because investors think this strong earnings growth might actually underperform the broader market in the near future. If that doesn't eventuate, then existing shareholders have reason to be quite optimistic about the future direction of the share price.

Does Growth Match The Low P/E?

There's an inherent assumption that a company should underperform the market for P/E ratios like Swancor Advanced Materials' to be considered reasonable.

Taking a look back first, we see that the company grew earnings per share by an impressive 43% last year. Despite this strong recent growth, it's still struggling to catch up as its three-year EPS frustratingly shrank by 29% overall. Therefore, it's fair to say the earnings growth recently has been undesirable for the company.

In contrast to the company, the rest of the market is expected to grow by 41% over the next year, which really puts the company's recent medium-term earnings decline into perspective.

In light of this, it's understandable that Swancor Advanced Materials' P/E would sit below the majority of other companies. Nonetheless, there's no guarantee the P/E has reached a floor yet with earnings going in reverse. Even just maintaining these prices could be difficult to achieve as recent earnings trends are already weighing down the shares.

What We Can Learn From Swancor Advanced Materials' P/E?

Swancor Advanced Materials' stock might have been given a solid boost, but its P/E certainly hasn't reached any great heights. While the price-to-earnings ratio shouldn't be the defining factor in whether you buy a stock or not, it's quite a capable barometer of earnings expectations.

As we suspected, our examination of Swancor Advanced Materials revealed its shrinking earnings over the medium-term are contributing to its low P/E, given the market is set to grow. Right now shareholders are accepting the low P/E as they concede future earnings probably won't provide any pleasant surprises. Unless the recent medium-term conditions improve, they will continue to form a barrier for the share price around these levels.

Don't forget that there may be other risks. For instance, we've identified 1 warning sign for Swancor Advanced Materials that you should be aware of.

Of course, you might also be able to find a better stock than Swancor Advanced Materials. So you may wish to see this free collection of other companies that have reasonable P/E ratios and have grown earnings strongly.

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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.