If you are building a properly diversified stock portfolio, the chances are some of your picks will perform badly. Long term Canadian Solar Inc. (NASDAQ:CSIQ) shareholders know that all too well, since the share price is down considerably over three years. Sadly for them, the share price is down 54% in that time. And the ride hasn't got any smoother in recent times over the last year, with the price 53% lower in that time. Shareholders have had an even rougher run lately, with the share price down 18% in the last 90 days. This could be related to the recent financial results - you can catch up on the most recent data by reading our company report.

While the stock has risen 5.6% in the past week but long term shareholders are still in the red, let's see what the fundamentals can tell us.

There is no denying that markets are sometimes efficient, but prices do not always reflect underlying business performance. One way to examine how market sentiment has changed over time is to look at the interaction between a company's share price and its earnings per share (EPS).

During the unfortunate three years of share price decline, Canadian Solar actually saw its earnings per share (EPS) improve by 19% per year. This is quite a puzzle, and suggests there might be something temporarily buoying the share price. Alternatively, growth expectations may have been unreasonable in the past.

It's worth taking a look at other metrics, because the EPS growth doesn't seem to match with the falling share price.

We note that, in three years, revenue has actually grown at a 27% annual rate, so that doesn't seem to be a reason to sell shares. This analysis is just perfunctory, but it might be worth researching Canadian Solar more closely, as sometimes stocks fall unfairly. This could present an opportunity.

You can see how earnings and revenue have changed over time in the image below (click on the chart to see the exact values).

We're pleased to report that the CEO is remunerated more modestly than most CEOs at similarly capitalized companies. It's always worth keeping an eye on CEO pay, but a more important question is whether the company will grow earnings throughout the years. So we recommend checking out this free report showing consensus forecasts

A Different Perspective

Investors in Canadian Solar had a tough year, with a total loss of 53%, against a market gain of about 27%. However, keep in mind that even the best stocks will sometimes underperform the market over a twelve month period. Regrettably, last year's performance caps off a bad run, with the shareholders facing a total loss of 0.5% 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. Take risks, for example - Canadian Solar has 3 warning signs (and 2 which shouldn't be ignored) we think you should know about.

If you like to buy stocks alongside management, then you might just love this free list of companies. (Hint: insiders have been buying them).

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