Shenyu Communication Technology Inc. (SZSE:300563) shareholders that were waiting for something to happen have been dealt a blow with a 31% share price drop in the last month. The recent drop has obliterated the annual return, with the share price now down 9.8% over that longer period.

Although its price has dipped substantially, Shenyu Communication Technology may still be sending very bearish signals at the moment with a price-to-earnings (or "P/E") ratio of 51.5x, since almost half of all companies in China have P/E ratios under 29x and even P/E's lower than 18x are not unusual. Nonetheless, we'd need to dig a little deeper to determine if there is a rational basis for the highly elevated P/E.

As an illustration, earnings have deteriorated at Shenyu Communication Technology over the last year, which is not ideal at all. One possibility is that the P/E is high because investors think the company will still do enough to outperform the broader market in the near future. You'd really hope so, otherwise you're paying a pretty hefty price for no particular reason.

See our latest analysis for Shenyu Communication Technology

Does Growth Match The High P/E?

Shenyu Communication Technology's P/E ratio would be typical for a company that's expected to deliver very strong growth, and importantly, perform much better than the market.

Retrospectively, the last year delivered a frustrating 40% decrease to the company's bottom line. This means it has also seen a slide in earnings over the longer-term as EPS is down 49% in total over the last three years. So unfortunately, we have to acknowledge that the company has not done a great job of growing earnings over that time.

In contrast to the company, the rest of the market is expected to grow by 42% over the next year, which really puts the company's recent medium-term earnings decline into perspective.

In light of this, it's alarming that Shenyu Communication Technology's P/E sits above the majority of other companies. Apparently many investors in the company are way more bullish than recent times would indicate and aren't willing to let go of their stock at any price. Only the boldest would assume these prices are sustainable as a continuation of recent earnings trends is likely to weigh heavily on the share price eventually.

The Bottom Line On Shenyu Communication Technology's P/E

Shenyu Communication Technology's shares may have retreated, but its P/E is still flying high. 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.

Our examination of Shenyu Communication Technology revealed its shrinking earnings over the medium-term aren't impacting its high P/E anywhere near as much as we would have predicted, given the market is set to grow. When we see earnings heading backwards and underperforming the market forecasts, we suspect the share price is at risk of declining, sending the high P/E lower. If recent medium-term earnings trends continue, it will place shareholders' investments at significant risk and potential investors in danger of paying an excessive premium.

Don't forget that there may be other risks. For instance, we've identified 2 warning signs for Shenyu Communication Technology that 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 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.