Buffett may be the world's most well-known value investor -- an investor who buys a stock when it's trading below its intrinsic value, with the idea that the rest of the market will eventually recognize the company's strengths and hop on board. And that will push the stock higher, delivering gains to those who got it for a good price.

The legendary investor expressed his inclination for equities even after selling large chunks of Berkshire Hathaway's investments in three major banks. "That preference won't change," Buffett wrote in his annual letter to shareholders.

A rock star of the RV industry drove his company to Berkshire Hathaway—and made billions for Buffett’s shareholders.