As every investor would know, not every swing hits the sweet spot. But really big losses can really drag down an overall portfolio. So take a moment to sympathize with the long term shareholders of Vir Biotechnology, Inc. (NASDAQ:VIR), who have seen the share price tank a massive 80% over a three year period. That would certainly shake our confidence in the decision to own the stock. More recently, the share price has dropped a further 9.2% in a month. We really feel for shareholders in this scenario. It's a good reminder of the importance of diversification, and it's worth keeping in mind there's more to life than money, anyway.

On a more encouraging note the company has added US$79m to its market cap in just the last 7 days, so let's see if we can determine what's driven the three-year loss for shareholders.

Given that Vir Biotechnology didn't make a profit in the last twelve months, we'll focus on revenue growth to form a quick view of its business development. Shareholders of unprofitable companies usually desire strong revenue growth. As you can imagine, fast revenue growth, when maintained, often leads to fast profit growth.

In the last three years Vir Biotechnology saw its revenue shrink by 69% per year. That means its revenue trend is very weak compared to other loss making companies. And as you might expect the share price has been weak too, dropping at a rate of 22% per year. Never forget that loss making companies with falling revenue can and do cause losses for everyday investors. 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 graphic below depicts how earnings and revenue have changed over time (unveil the exact values by clicking on the image).

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

Investors in Vir Biotechnology had a tough year, with a total loss of 7.9%, against a market gain of about 34%. However, keep in mind that even the best stocks will sometimes underperform the market over a twelve month period. Unfortunately, last year's performance may indicate unresolved challenges, given that it was worse than the annualised loss of 5% 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. 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 example, we've discovered 3 warning signs for Vir Biotechnology that you should be aware of before investing here.

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 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.