Turning an initial capital of, say, $1000 into double that in half a decade amounts to a compound annual growth rate of nearly 15%. That's not easy to pull off, but it is certainly possible. The kind of companies that can register such returns are often corporations with leadership and plenty of room to grow in a vast industry.

Let's look at two companies that appear able to accomplish this feat: (NASDAQ: DXCM) and Etsy (NASDAQ: ETSY). 

DexCom is looking at a massive opportunity in the market for continuous glucose monitoring (CGM) systems. These devices allow diabetes patients to track their blood glucose throughout the day, allowing them to make informed decisions about their health. CMG systems tend to be superior to blood glucose meters that only measure patients' blood glucose at a specific point.

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Source Fool.com