Over the last 10 years, few stocks have performed as well as Apple and Microsoft. The stock prices for these two tech giants are up 975% and 828%, respectively, compared to the 162% return for the S&P 500. And many investors would rightly credit growth for these market-beating returns.

One company that can claim far greater growth in revenue per share than either Apple or Microsoft is mattress company Sleep Number (NASDAQ: SNBR). And yet, if you invested $1,000 in Sleep Number stock 10 years ago, you'd have just $1,006 today. The stock underperformed the market by a wide margin even though it's beating Apple and Microsoft in revenue-per-share growth, as the chart below shows.

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Source Fool.com