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 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.

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.

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

Warren Buffett's company, Berkshire Hathaway (NYSE: BRK.A)(NYSE: BRK.B), can't seem to get enough of Occidental Petroleum (NYSE: OXY). The conglomerate recently purchased another 8.9 million shares of the oil company for $405 million.

Also in the second quarter of this year, Berkshire Hathaway added beauty retailer Ulta Beauty Inc (NASDAQ:ULTA) to its portfolio. However, in the following three months, the fund disposed of almost the entire position by selling 665,903 shares.