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

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.

Despite once calling Apple the "best business" in the world, Buffett sold 100 million shares in the third quarter, cutting Berkshire's stake by 25%. And while Apple still ranked as the company's largest holding as of Sept. 30, Buffett has now sold more than 615 million shares in the last four quarters.

Six blue-chip stocks aggressively backed by Warren Buffett are on sale on Wall Street as the year draws to a close, mainly due to broad economic factors and stock market fashion. That makes them worth a look,

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

Berkshire Hathaway stock is up a stunning 26% this year, while Warren Buffett has been on a selling spree and now has $325 billion in cash.

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 stature as the company’s largest shareholder.