Shenyu Communication Technology Inc. (SZSE:300563) shares have continued their recent momentum with a 61% gain in the last month alone. The last 30 days bring the annual gain to a very sharp 83%.

After such a large jump in price, Shenyu Communication Technology may be sending bearish signals at the moment with its price-to-earnings (or "P/E") ratio of 43.5x, since almost half of all companies in China have P/E ratios under 31x and even P/E's lower than 19x are not unusual. Although, it's not wise to just take the P/E at face value as there may be an explanation why it's as high as it is.

Shenyu Communication Technology certainly has been doing a great job lately as it's been growing earnings at a really rapid pace. It seems that many are expecting the strong earnings performance to beat most other companies over the coming period, which has increased investors' willingness to pay up for the stock. You'd really hope so, otherwise you're paying a pretty hefty price for no particular reason.

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

In order to justify its P/E ratio, Shenyu Communication Technology would need to produce impressive growth in excess of the market.

Taking a look back first, we see that the company grew earnings per share by an impressive 167% last year. The strong recent performance means it was also able to grow EPS by 40% in total over the last three years. So we can start by confirming that the company has done a great job of growing earnings over that time.

This is in contrast to the rest of the market, which is expected to grow by 39% over the next year, materially higher than the company's recent medium-term annualised growth rates.

In light of this, it's alarming that Shenyu Communication Technology's P/E sits above the majority of other companies. It seems most investors are ignoring the fairly limited recent growth rates and are hoping for a turnaround in the company's business prospects. There's a good chance existing shareholders are setting themselves up for future disappointment if the P/E falls to levels more in line with recent growth rates.

What We Can Learn From Shenyu Communication Technology's P/E?

The large bounce in Shenyu Communication Technology's shares has lifted the company's P/E to a fairly high level. It's argued the price-to-earnings ratio is an inferior measure of value within certain industries, but it can be a powerful business sentiment indicator.

We've established that Shenyu Communication Technology currently trades on a much higher than expected P/E since its recent three-year growth is lower than the wider market forecast. Right now we are increasingly uncomfortable with the high P/E as this earnings performance isn't likely to support such positive sentiment for long. Unless the recent medium-term conditions improve markedly, it's very challenging to accept these prices as being reasonable.

Before you settle on your opinion, we've discovered 2 warning signs for Shenyu Communication Technology (1 can't be ignored!) that you should be aware of.

If P/E ratios interest you, you may wish to see this free collection of other companies with strong earnings growth and low P/E ratios.

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