【Buffett Increases Stake in an Internet Infrastructure Service Company】Golden Finance reports that the latest documents show that Berkshire Hathaway, owned by Buffett, has increased its stake by purchasing 143,424 shares of the internet infrastructure service company VeriSign for $28.55 million over three trading days ending on the 24th. Together with the shares purchased previously, Berkshire currently holds 13.7% of the issued shares of VeriSign, worth nearly $2.7 billion. The report states that one reason Buffett may be interested in VeriSign is its high rankings in various profit margin metrics among the S&P 500 component companies.