Those holding ComNav Technology Ltd. (SHSE:688592) shares would be relieved that the share price has rebounded 35% in the last thirty days, but it needs to keep going to repair the recent damage it has caused to investor portfolios. While recent buyers may be laughing, long-term holders might not be as pleased since the recent gain only brings the stock back to where it started a year ago.

Since its price has surged higher, ComNav Technology may be sending very bearish signals at the moment with a price-to-earnings (or "P/E") ratio of 74.2x, since almost half of all companies in China have P/E ratios under 30x and even P/E's lower than 18x are not unusual. Nonetheless, we'd need to dig a little deeper to determine if there is a rational basis for the highly elevated P/E.

We'd have to say that with no tangible growth over the last year, ComNav Technology's earnings have been unimpressive. 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. If not, then existing shareholders may be a little 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 far outperform the market for P/E ratios like ComNav Technology's to be considered reasonable.

Taking a look back first, we see that there was hardly any earnings per share growth to speak of for the company over the past year. Fortunately, a few good years before that means that it was still able to grow EPS by 7.7% in total over the last three years. Therefore, it's fair to say that earnings growth has been inconsistent recently for the company.

Weighing that recent medium-term earnings trajectory against the broader market's one-year forecast for expansion of 39% shows it's noticeably less attractive on an annualised basis.

In light of this, it's alarming that ComNav Technology's 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 Key Takeaway

Shares in ComNav Technology have built up some good momentum lately, which has really inflated its P/E. 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.

We've established that ComNav Technology currently trades on a much higher than expected P/E since its recent three-year growth is lower than the wider market forecast. 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. 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.

You should always think about risks. Case in point, we've spotted 1 warning sign for ComNav Technology you should be aware of.

You might be able to find a better investment than ComNav Technology. If you want a selection of possible candidates, check out this free list of interesting companies that trade on a low P/E (but have proven they can grow earnings).

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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.