If you are building a properly diversified stock portfolio, the chances are some of your picks will perform badly. Long term Shanghai New Power Automotive Technology Company Limited (SHSE:600841) shareholders know that all too well, since the share price is down considerably over three years. So they might be feeling emotional about the 67% share price collapse, in that time. And over the last year the share price fell 34%, so we doubt many shareholders are delighted. Even worse, it's down 12% in about a month, which isn't fun at all. Importantly, this could be a market reaction to the recently released financial results. You can check out the latest numbers in our company report.

Given the past week has been tough on shareholders, let's investigate the fundamentals and see what we can learn.

Shanghai New Power Automotive Technology isn't currently profitable, so most analysts would look to revenue growth to get an idea of how fast the underlying business is growing. Shareholders of unprofitable companies usually desire strong revenue growth. That's because fast revenue growth can be easily extrapolated to forecast profits, often of considerable size.

Over the last three years, Shanghai New Power Automotive Technology's revenue dropped 54% per year. That's definitely a weaker result than most pre-profit companies report. With no profits and falling revenue it is no surprise that investors have been dumping the stock, pushing the price down by 19% per year over that time. When revenue is dropping, and losses are still costing, and the share price sinking fast, it's fair to ask if something is remiss. It could be a while before the company repays long suffering shareholders with share price gains.

The graphic below depicts how earnings and revenue have changed over time (unveil the exact values by clicking on the image).

Take a more thorough look at Shanghai New Power Automotive Technology's financial health with this free report on its balance sheet.

A Different Perspective

While the broader market lost about 17% in the twelve months, Shanghai New Power Automotive Technology shareholders did even worse, losing 34%. Having said that, it's inevitable that some stocks will be oversold in a falling market. The key is to keep your eyes on the fundamental developments. Unfortunately, last year's performance may indicate unresolved challenges, given that it was worse than the annualised loss of 8% over the last half decade. We realise that Baron Rothschild has said investors should "buy when there is blood on the streets", but we caution that investors should first be sure they are buying a high quality business. 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. For instance, we've identified 2 warning signs for Shanghai New Power Automotive Technology that you should be aware of.

Of course, you might find a fantastic investment by looking elsewhere. So take a peek at this free list of companies we expect will 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.