Amkor Technology is a semiconductor product packaging and test services provider. The company has been headquartered in Tempe, Arizona, since 2005, when it was moved from West Chester, Pennsylvania, United States. The company was founded in 1968 and has more than 30,000 employees worldwide and a reported $4.2 billion in revenue for 2018. Amkor Technology is one of the world's largest providers of outsourced semiconductor packaging and test services. The company offers semiconductor design, wafer fabrication, assembly and test services. Amkor's operational base includes production facilities, product development centers, and sales and support offices located in Asia, Europe and the United States. The company's customers include integrated device manufacturers, fabless semiconductor companies and contract foundries. Amkor Technology was founded in 1968 and became a public company in 1998.