Berkshire Hathaway Inc. Cl B closed $40.57 below its 52-week high ($491.67), which the company achieved on November 27th.

For decades, Berkshire Hathaway's stock was only available through over-the-counter markets. But on Nov. 29, 1988, it listed what are now known as its Class A shares on the New York Stock Exchange. In his shareholder letter that year, Buffett said his main motivation was minimizing investors' transaction costs.

Berkshire Hathaway (NYSE: BRK.A)(NYSE: BRK.B) has been one of the most successful stock investments of all time. Plus, many people reading this aren't old even enough to have bought Berkshire stock in the 1960s.

Warren Buffett’s Berkshire Hathaway bought more than $560 million worth of stocks over the last three days. The company purchased 8.9 million shares of Occidental Petroleum for $405 million. This pushed Berkshire’s stake in the Houston-based energy producer above 28%.