Today, let's look at investing giant Warren Buffett. His Berkshire Hathaway Inc. (NYSE: BRK.B ) company has increased its per-share book value by an annual average of 19.7% between 1965 and 2012, leaving the S&P 500 in the dust with its 9.4%. Clearly, the guy knows a thing or two about investing. With that in mind, let's take a look at his company's recent investment activity, noting that he heads a large corporation, and not a hedge fund or mutual fund. While he owns many businesses in their entirety, from Dairy Queen to Geico to Fruit of the Loom, he also has tens of billions of dollars invested in the stock of other companies.