Sleep Number Corporation (NASDAQ:SNBR) shareholders will doubtless be very grateful to see the share price up 37% in the last quarter. But spare a thought for the long term holders, who have held the stock as it bled value over the last five years. In fact, the share price has tumbled down a mountain to land 80% lower after that period. So we don't gain too much confidence from the recent recovery. The important question is if the business itself justifies a higher share price in the long term. 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.

While the stock has risen 28% in the past week but long term shareholders are still in the red, let's see what the fundamentals can tell us.

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Sleep Number 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 five years Sleep Number saw its revenue shrink by 1.5% per year. While far from catastrophic that is not good. The share price fall of 13% (per year, over five years) is a stern reminder that money-losing companies are expected to grow revenue. We're generally averse to companies with declining revenues, but we're not alone in that. That is not really what the successful investors we know aim for.

You can see how earnings and revenue have changed over time in the image below (click on the chart to see the exact values).

It's probably worth noting we've seen significant insider buying in the last quarter, which we consider a positive. That said, we think earnings and revenue growth trends are even more important factors to consider. You can see what analysts are predicting for Sleep Number in this interactive graph of future profit estimates.

A Different Perspective

Sleep Number shareholders are down 7.9% for the year, but the market itself is up 19%. However, keep in mind that even the best stocks will sometimes underperform the market over a twelve month period. However, the loss over the last year isn't as bad as the 13% per annum loss investors have suffered over the last half decade. We would want clear information suggesting the company will grow, before taking the view that the share price will stabilize. 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. Like risks, for instance. Every company has them, and we've spotted 3 warning signs for Sleep Number (of which 2 are significant!) you should know about.

Sleep Number is not the only stock insiders are buying. So take a peek at this free list of small cap companies at attractive valuations which insiders have been buying.

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

Have feedback on this article? Concerned about the content? Get in touch with us directly. Alternatively, email editorial-team (at) simplywallst.com.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.