Siliconware Precision Industries Co., Ltd. is principally engaged in the provision of semiconductor packaging and testing services. The Company operates its businesses through packaging services, which deals with ball grid array (BGA) integrated circuits (ICs), flip-chip BGA ICs and other IC products; bumping services, which offers 8- and 12-inch wafer bumping; testing services, which deals with 8- and 12-inch wafer sort testing, final testing and system level testing, as well as other business, which offers flash memory cards and other products. During the year ended December 31, 2011, the Company obtained approximately 85% of its total revenue from packaging services. It operates its businesses primarily in Taiwan and North America.