Bruce Berkowitz is not giving up on iconic retailer Sears. Berkowitz’s Fairholme Capital Management is the largest external shareholder at Sears Holdings Corp., and he is apparently still confident as he is doubling down on his bet on the firm. Berkowitz has been a strong supporter of Edward Lampert, the hedge fund manager who operates Sears and controls close to half of the shares, for some time. But Fairholme’s December 18th filing with the SEC detailing his larger stake suggests that Berkowitz intends to have a greater say along with his increased stake in the retailer.