iRobot Corporation (NASDAQ:IRBT) shareholders should be happy to see the share price up 17% in the last week. But that doesn't change the fact that the returns over the last three years have been stomach churning. Indeed, the share price is down a whopping 90% in the last three years. So it's about time shareholders saw some gains. Of course the real question is whether the business can sustain a turnaround. 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.

The recent uptick of 17% could be a positive sign of things to come, so let's take a look at historical fundamentals.

See our latest analysis for iRobot

iRobot isn't currently profitable, so most analysts would look to revenue growth to get an idea of how fast the underlying business is growing. When a company doesn't make profits, we'd generally hope to see good revenue growth. As you can imagine, fast revenue growth, when maintained, often leads to fast profit growth.

In the last three years iRobot saw its revenue shrink by 26% 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 24% 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 company's revenue and earnings (over time) are depicted in the image below (click to see the exact numbers).

You can see how its balance sheet has strengthened (or weakened) over time in this free interactive graphic.

A Different Perspective

While the broader market gained around 33% in the last year, iRobot shareholders lost 70%. 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 13% per year over five years. 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 4 warning signs for iRobot (1 can't be ignored!) that you should be aware of before investing here.

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 American exchanges.

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