Samsung Electronics Co., the world\'s top smartphone maker, and two other South Korean companies accounted for nearly a third of combined net profits of local firms last year, data showed Monday, in the latest sign of concentration of wealth in a few conglomerates in Asia\'s fourth-largest economy. The other two companies are Hyundai Motor Co. and its smaller sister company Kia Motors Corp., the two major flagship units of Hyundai Motor Group, the world\'s fifth-largest carmaker.