Warren Buffett started to build up the position in Graham Holdings in Q4 2013. Since then they sold 1.73 Million shares. The investor completely sold their stake between Q2 2014 and Q1 2018.
Graham Holdings is a miniature version of Berkshire Hathaway controlled by the Graham family, which has a long relationship with Warren Buffett.Yahoo Finance, over 2 years ago
The miniature conglomerate has lucrative TV stations,Barron's, about 3 years ago