Nongfu Spring Co., Ltd.'s (HKG:9633) price-to-earnings (or "P/E") ratio of 29.3x might make it look like a strong sell right now compared to the market in Hong Kong, where around half of the companies have P/E ratios below 10x and even P/E's below 5x are quite common. Nonetheless, we'd need to dig a little deeper to determine if there is a rational basis for the highly elevated P/E.

With earnings growth that's superior to most other companies of late, Nongfu Spring has been doing relatively well. It seems that many are expecting the strong earnings performance to persist, which has raised the P/E. If not, then existing shareholders might be a little nervous about the viability of the share price.

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Is There Enough Growth For Nongfu Spring?

In order to justify its P/E ratio, Nongfu Spring would need to produce outstanding growth well in excess of the market.

If we review the last year of earnings growth, the company posted a terrific increase of 30%. The strong recent performance means it was also able to grow EPS by 94% in total over the last three years. Accordingly, shareholders would have probably welcomed those medium-term rates of earnings growth.

Looking ahead now, EPS is anticipated to climb by 11% per annum during the coming three years according to the analysts following the company. That's shaping up to be materially lower than the 13% per year growth forecast for the broader market.

In light of this, it's alarming that Nongfu Spring's P/E sits above the majority of other companies. It seems most investors are hoping for a turnaround in the company's business prospects, but the analyst cohort is not so confident this will happen. Only the boldest would assume these prices are sustainable as this level of earnings growth is likely to weigh heavily on the share price eventually.

The Key Takeaway

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.

We've established that Nongfu Spring currently trades on a much higher than expected P/E since its forecast growth is lower than the wider market. When we see a weak earnings outlook with slower than market growth, we suspect the share price is at risk of declining, sending the high P/E lower. This places shareholders' investments at significant risk and potential investors in danger of paying an excessive premium.

Before you settle on your opinion, we've discovered 1 warning sign for Nongfu Spring 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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