The stock market has a habit of rewarding investors that stay with it through the ups and downs. Now, the performance of your portfolio in a wide range of market environments will be very specific to the stocks you buy, the length of time that you hold them, the diversification of your holdings, and the types of industries and companies you gravitate toward, to name a few key factors.

If you're on the hunt for stocks that could potentially increase your initial investment five times or more by the start of the next decade, here are two names to consider adding to a well-diversified basket of companies right now. 

Vertex Pharmaceuticals (NASDAQ: VRTX) has built a profitable and market-leading franchise of cystic fibrosis medicines that, to this day, are the only drugs approved to treat the underlying cause of this insidious genetic disease. Even as Vertex Pharmaceuticals continues to dominate the multibillion-dollar cystic fibrosis treatment market, the company is aggressively working to position itself as a leading figure in other sectors of the rare disease drug market. From rare blood disorders to Type 1 diabetes to acute pain, the company has a range of promising candidates in the pipeline, each of which could pose blockbuster potential for this already highly profitable, growth-oriented business. 

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Source Fool.com