VeriSign is ranked 5th in the S&P 500 for the highest profit margin, at about 56%, tied with Nvidia, according to third-quarter financial data.

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.

Despite Buffett overseeing stakes in nearly four-dozen securities, the lion's share of Berkshire's invested assets have been put to work in seven top ideas.

Geico, and pension plans of other Berkshire Hathaway units bought nearly $30 million of shares of domain-name registry firm VeriSign.

Warren Buffett went on bit of a shopping spree in the stock market before Christmas, picking up shares of Occidental Petroleum among others during a swift December sell-off.

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.

Warren Buffett’s Berkshire Hathaway Inc. has been busy over the past week buying stock in an internet domain-name registry company, to extend its lead as the company’s largest shareholder. In a Form 4 filing with the Securities and Exchange Commission late Thursday,

Warren Buffett has invested more than $74 million in a Reston company best known for controlling internet domains for organizations across the globe.