Unfortunately for some shareholders, the Perfect Optronics Limited (HKG:8311) share price has dived 26% in the last thirty days, prolonging recent pain. The recent drop completes a disastrous twelve months for shareholders, who are sitting on a 58% loss during that time.

Although its price has dipped substantially, Perfect Optronics' price-to-earnings (or "P/E") ratio of 30.9x might still 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 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 so lofty.

For example, consider that Perfect Optronics' financial performance has been pretty ordinary lately as earnings growth is non-existent. It might be that many are expecting an improvement to the uninspiring earnings performance over the coming period, which has kept the P/E from collapsing. You'd really hope so, otherwise you're paying a pretty hefty price for no particular reason.

Check out our latest analysis for Perfect Optronics

How Is Perfect Optronics' Growth Trending?

Perfect Optronics' 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 virtually the same number to the company's bottom line as the year before. That's essentially a continuation of what we've seen over the last three years, as its EPS growth has been virtually non-existent for that entire period. Accordingly, shareholders probably wouldn't have been satisfied with the complete absence of medium-term growth.

Comparing that to the market, which is predicted to deliver 24% growth in the next 12 months, the company's momentum is weaker based on recent medium-term annualised earnings results.

In light of this, it's alarming that Perfect Optronics' 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 Perfect Optronics' P/E

Perfect Optronics' shares may have retreated, but its P/E is still flying high. We'd say the price-to-earnings ratio's power isn't primarily as a valuation instrument but rather to gauge current investor sentiment and future expectations.

Our examination of Perfect Optronics revealed its three-year earnings trends aren't impacting its high P/E anywhere near as much as we would have predicted, given they look worse than current market expectations. When we see weak earnings with slower than market growth, we suspect the share price is at risk of declining, sending the high P/E lower. Unless the recent medium-term conditions improve markedly, it's very challenging to accept these prices as being reasonable.

Before you take the next step, you should know about the 3 warning signs for Perfect Optronics (1 shouldn't be ignored!) that we have uncovered.

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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