Kantone Holdings Limited (HKG:1059) shareholders that were waiting for something to happen have been dealt a blow with a 29% share price drop in the last month. The drop over the last 30 days has capped off a tough year for shareholders, with the share price down 35% in that time.

Even after such a large drop in price, Kantone Holdings' price-to-earnings (or "P/E") ratio of 13.9x might still make it look like a sell right now compared to the market in Hong Kong, where around half of the companies have P/E ratios below 9x and even P/E's below 5x are quite common. 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.

As an illustration, earnings have deteriorated at Kantone Holdings 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. If not, then existing shareholders may be quite nervous about the viability of the share price.

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

There's an inherent assumption that a company should outperform the market for P/E ratios like Kantone Holdings' to be considered reasonable.

Retrospectively, the last year delivered a frustrating 41% 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 30% in total over the last three years. Therefore, it's fair to say the earnings growth recently has been undesirable for the company.

Weighing that medium-term earnings trajectory against the broader market's one-year forecast for expansion of 22% shows it's an unpleasant look.

In light of this, it's alarming that Kantone Holdings' 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. There's a very good chance existing shareholders are setting themselves up for future disappointment if the P/E falls to levels more in line with the recent negative growth rates.

The Bottom Line On Kantone Holdings' P/E

Kantone Holdings' P/E hasn't come down all the way after its stock plunged. Generally, our preference is to limit the use of the price-to-earnings ratio to establishing what the market thinks about the overall health of a company.

Our examination of Kantone Holdings 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. Right now we are increasingly uncomfortable with the high P/E as this earnings performance is highly unlikely to support such positive sentiment for long. 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.

It is also worth noting that we have found 4 warning signs for Kantone Holdings (1 is potentially serious!) that you need to take into consideration.

Of course, you might also be able to find a better stock than Kantone Holdings. 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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