VeriSign shares fell on Tuesday after Warren Buffett's Berkshire Hathaway sold nearly one-third of its stake in the internet infrastructure and domain name registry company for $1.23 billion.

VeriSign Inc. shares drop as Berkshire Hathaway sells chunk of holdings. Sale aims to reduce ownership below 10% regulatory threshold.

Since first buying in 2012, Berkshire had built a 13.29 million?share position worth $4.07 billion before this sale, turning early bets into huge gains as VRSN shares jumped 48% YTD. By trimming below 10%,