Hon Hai Precision is the largest contract manufacturer of consumer electronics, communications and computer products with 34% market share globally. It is the biggest supplier to Apple, and business with Apple accounts for 50% of the company's overall revenue. Assembly of electronic products makes up 70% of overall revenue. Hon Hai is also involved in the production of upstream components such as electronic connectors, semiconductor packaging, industrial robots, and metal casings for smartphones. These upstream activities are mainly conducted through its listed subsidiaries Foxconn Interconnect Technology, ShunSin Technology, and Foxconn Industrial Internet, in which Hon Hai holds controlling stakes of 77%, 61%, and 85%, respectively.