International Business Machines Corp. might have lost up to 17% of value in the fourth quarter according to CNBC's , Dominic Chu, but that could not stop billionaire investor Warren Buffett from increasing his stake in the company. The move by the billionaire investor Warren Buffet through his investment firm Berkshire Hathaway goes to affirm support for chief executive, Ginni Rometty, who is trying to reignite growth in the company.