Amkor is a provider of outsourced semiconductor packaging and test services to integrated device manufacturers, fabless semiconductor companies, and contract foundries. The firm's products are organized into two streams: advanced products, including flip chip, wafer-level processing and testing services; and mainstream products, including wirebond packaging and testing. Roughly a third of the firm's revenue is generated in the United States, with the rest coming from China, Ireland, Japan, Malaysia, Taiwan, Singapore, and countries across the world.