Warrett Buffett sold all his Pfizer shares...A) (NYSE:BRK.B) buys, it holds for years -- but not all of them. ... In a regulatory filing last week, though, Berkshire revealed that it had dumped all of its shares in the big drugmaker. Pfizer became one of 37 stocks Buffett sold last year and one of 15 of which he completely exited.Feb. 21, 2021