It was 1965 when Warren Buffett became the CEO of the Berkshire Hathaway (NYSE: BRK.A)(NYSE: BRK.B) investment company. Berkshire also has a record $325 billion in cash, which can be put to work whenever new opportunities arise.

Buffett first invested in Verisign ( VRSN -0.27%) in 2012, and at the time of this writing, the shares have gone on to increase by at least 325% since then. He continued to buy shares in 2013 and 2014, but it has been more than 10 years since he added to the position. Here's why he's coming back to Verisign now.

Investors can often benefit from following the recent movements and decisions made by the biggest names in the market, especially if they can work through reverse engineering some of the reasoning behind these decisions.