The truth is that if you invest for long enough, you're going to end up with some losing stocks. But the long term shareholders of Sanan Optoelectronics Co.,Ltd (SHSE:600703) have had an unfortunate run in the last three years. Unfortunately, they have held through a 58% decline in the share price in that time. And more recent buyers are having a tough time too, with a drop of 42% in the last year. Shareholders have had an even rougher run lately, with the share price down 19% in the last 90 days. Of course, this share price action may well have been influenced by the 14% decline in the broader market, throughout the period.

With that in mind, it's worth seeing if the company's underlying fundamentals have been the driver of long term performance, or if there are some discrepancies.

In his essay The Superinvestors of Graham-and-Doddsville Warren Buffett described how share prices do not always rationally reflect the value of a business. One flawed but reasonable way to assess how sentiment around a company has changed is to compare the earnings per share (EPS) with the share price.

Sanan OptoelectronicsLtd saw its share price decline over the three years in which its EPS also dropped, falling to a loss. Due to the loss, it's not easy to use EPS as a reliable guide to the business. But it's safe to say we'd generally expect the share price to be lower as a result!

The graphic below depicts how EPS has changed over time (unveil the exact values by clicking on the image).

This free interactive report on Sanan OptoelectronicsLtd's earnings, revenue and cash flow is a great place to start, if you want to investigate the stock further.

A Different Perspective

We regret to report that Sanan OptoelectronicsLtd shareholders are down 42% for the year (even including dividends). Unfortunately, that's worse than the broader market decline of 23%. However, it could simply be that the share price has been impacted by broader market jitters. It might be worth keeping an eye on the fundamentals, in case there's a good opportunity. Regrettably, last year's performance caps off a bad run, with the shareholders facing a total loss of 1.8% per year over five years. Generally speaking long term share price weakness can be a bad sign, though contrarian investors might want to research the stock in hope of a turnaround. While it is well worth considering the different impacts that market conditions can have on the share price, there are other factors that are even more important. Case in point: We've spotted 1 warning sign for Sanan OptoelectronicsLtd you should be aware of.

If you would prefer to check out another company -- one with potentially superior financials -- then do not miss this free list of companies that have proven they can grow earnings.

Please note, the market returns quoted in this article reflect the market weighted average returns of stocks that currently trade on Chinese exchanges.

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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.