In this edition of The Motley Fool's "Ask a Fool" series, Motley Fool One analyst Jason Moser takes a question from a reader who asks: "I have a large investment in Disney (NYSE:DIS) and InvenSense (NYSE:INVN). Should I sell Disney at $82 and reinvest proceeds into InvenSense? If I do this I will have 2,900 shares of InvenSense hoping for a upward movement."

As a guideline, Jason believes that you don't want to overweight your portfolio in any investment. No matter how much you may like the company and its prospects, investors need to expect the unexpected, and diversity helps prepare you for just that. Because small caps are inherently riskier because of their size, investors should plan on owning a number of small caps to spread that risk out.

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Jason Moser owns shares of Walt Disney. The Motley Fool recommends and owns shares of InvenSense and Walt Disney. Try any of our Foolish newsletter services free for 30 days. We Fools don't all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.