Warren Buffett’s Berkshire Hathaway Inc. added to its stake in the internet domain-name-registry company VeriSign Inc. in the final week of the year, according to a regulatory filing.

Together with the 139,930 Verisign shares purchased earlier in December, Buffett has now increased his stake in the business to roughly 13.3 million shares in total. The stock is trading at an attractive forward price-to-earnings (PE) ratio of 22.97, and readers should note that the company’s last quarterly report included a strong earnings beat.

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 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.

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

Warren Buffett is one of the most successful investors in history. He has often recommended that most people invest in an S&P 500 index fund. The Vanguard S&P 500 ETF is a popular choice that Buffett himself owns through his company,