Shanghai Yaohua Pilkington Glass Group Co., Ltd. (SHSE:600819) shareholders should be happy to see the share price up 18% in the last week. But in truth the last year hasn't been good for the share price. After all, the share price is down 37% in the last year, significantly under-performing the market.

Although the past week has been more reassuring for shareholders, they're still in the red over the last year, so let's see if the underlying business has been responsible for the decline.

Shanghai Yaohua Pilkington Glass Group wasn't profitable in the last twelve months, it is unlikely we'll see a strong correlation between its share price and its earnings per share (EPS). Arguably revenue is our next best option. Shareholders of unprofitable companies usually expect strong revenue growth. That's because it's hard to be confident a company will be sustainable if revenue growth is negligible, and it never makes a profit.

In the last twelve months, Shanghai Yaohua Pilkington Glass Group increased its revenue by 12%. While that may seem decent it isn't great considering the company is still making a loss. Given this lacklustre revenue growth, the share price drop of 37% seems pretty appropriate. It's important not to lose sight of the fact that profitless companies must grow. But if you buy a loss making company then you could become a loss making investor.

The image below shows how earnings and revenue have tracked over time (if you click on the image you can see greater detail).

This free interactive report on Shanghai Yaohua Pilkington Glass Group's balance sheet strength is a great place to start, if you want to investigate the stock further.

A Different Perspective

We regret to report that Shanghai Yaohua Pilkington Glass Group shareholders are down 37% for the year (even including dividends). Unfortunately, that's worse than the broader market decline of 19%. 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 0.8% 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. I find it very interesting to look at share price over the long term as a proxy for business performance. But to truly gain insight, we need to consider other information, too. For instance, we've identified 2 warning signs for Shanghai Yaohua Pilkington Glass Group that you should be aware of.

For those who like to find winning investments this free list of growing companies with recent insider purchasing, could be just the ticket.

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.