It's not possible to invest over long periods without making some bad investments. But really big losses can really drag down an overall portfolio. So consider, for a moment, the misfortune of Shanghai Junshi Biosciences Co., Ltd. (HKG:1877) investors who have held the stock for three years as it declined a whopping 83%. That would be a disturbing experience. The more recent news is of little comfort, with the share price down 61% in a year. Furthermore, it's down 45% in about a quarter. That's not much fun for holders. We note that the company has reported results fairly recently; and the market is hardly delighted. You can check out the latest numbers in our company report. We really hope anyone holding through that price crash has a diversified portfolio. Even when you lose money, you don't have to lose the lesson.

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

Shanghai Junshi Biosciences 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 expect strong revenue growth. As you can imagine, fast revenue growth, when maintained, often leads to fast profit growth.

In the last three years Shanghai Junshi Biosciences saw its revenue shrink by 28% per year. That means its revenue trend is very weak compared to other loss making companies. The swift share price decline at an annual compound rate of 22%, reflects this weak fundamental performance. We prefer leave it to clowns to try to catch falling knives, like this stock. It's worth remembering that investors call buying a steeply falling share price 'catching a falling knife' because it is a dangerous pass time.

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

Balance sheet strength is crucial. It might be well worthwhile taking a look at our free report on how its financial position has changed over time.

A Different Perspective

We regret to report that Shanghai Junshi Biosciences shareholders are down 61% for the year. Unfortunately, that's worse than the broader market decline of 13%. 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 9% 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. It's always interesting to track share price performance over the longer term. But to understand Shanghai Junshi Biosciences better, we need to consider many other factors. Case in point: We've spotted 1 warning sign for Shanghai Junshi Biosciences you should be aware of.

Of course Shanghai Junshi Biosciences may not be the best stock to buy. So you may wish to see this free collection of growth stocks.

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