Berkshire Hathaway continued its purchases of Verisign in recent days, buying about $4 million of the company that provides Internet domain registry and other services. The small recent buys, approximately 20,000 shares, were made at an average price of nearly $205 a share, according to a form 4 filing with the Securities and Exchange Commission late Friday. Berkshire now owns 13.3 million shares of Verisign, a roughly 14% stake worth about $2.7 billion.