P.B. Group Limited (HKG:8331) shareholders have had their patience rewarded with a 94% share price jump in the last month. Still, the 30-day jump doesn't change the fact that longer term shareholders have seen their stock decimated by the 59% share price drop in the last twelve months.

Although its price has surged higher, it's still not a stretch to say that P.B. Group's price-to-earnings (or "P/E") ratio of 8.9x right now seems quite "middle-of-the-road" compared to the market in Hong Kong, where the median P/E ratio is around 9x. However, investors might be overlooking a clear opportunity or potential setback if there is no rational basis for the P/E.

As an illustration, earnings have deteriorated at P.B. Group over the last year, which is not ideal at all. It might be that many expect the company to put the disappointing earnings performance behind them over the coming period, which has kept the P/E from falling. If you like the company, you'd at least be hoping this is the case so that you could potentially pick up some stock while it's not quite in favour.

View our latest analysis for P.B. Group

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

In order to justify its P/E ratio, P.B. Group would need to produce growth that's similar to the market.

Taking a look back first, the company's earnings per share growth last year wasn't something to get excited about as it posted a disappointing decline of 1.3%. At least EPS has managed not to go completely backwards from three years ago in aggregate, thanks to the earlier period of growth. So it appears to us that the company has had a mixed result in terms of growing earnings over that time.

Weighing that recent medium-term earnings trajectory against the broader market's one-year forecast for expansion of 15% shows it's noticeably less attractive on an annualised basis.

In light of this, it's curious that P.B. Group's P/E sits in line with the majority of other companies. It seems most investors are ignoring the fairly limited recent growth rates and are willing to pay up for exposure to the stock. Maintaining these prices will be difficult to achieve as a continuation of recent earnings trends is likely to weigh down the shares eventually.

What We Can Learn From P.B. Group's P/E?

Its shares have lifted substantially and now P.B. Group's P/E is also back up to the market median. Typically, we'd caution against reading too much into price-to-earnings ratios when settling on investment decisions, though it can reveal plenty about what other market participants think about the company.

Our examination of P.B. Group revealed its three-year earnings trends aren't impacting its P/E as much as we would have predicted, given they look worse than current market expectations. Right now we are uncomfortable with the P/E as this earnings performance isn't likely to support a more positive sentiment for long. If recent medium-term earnings trends continue, it will place shareholders' investments at risk and potential investors in danger of paying an unnecessary premium.

It is also worth noting that we have found 2 warning signs for P.B. Group (1 can't be ignored!) that you need to take into consideration.

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 P/E ratio below 20x).

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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.