According to Berkshire Hathaway‘s (NYSE: BRK-A) (NYSE: BRK-B) latest SEC filing, the company sold its entire AT&T (NYSE: T) stake during the first quarter of 2016. However, there’s not necessarily anything wrong with AT&T that caused Berkshire to head for the exits. Rather, the reason for getting rid of AT&T is simple — it’s not a Buffett stock.