Alpha & Omega Semiconductor Ltd. engages in the construction and operation of power semiconductor packaging, testing, and wafer fabrication facilities. It operates through the following geographical segments: Hong Kong, China, South Korea, United States, and Other Countries. The company was founded by Mike F. Chang, Yueh-Se Ho, Anup Bhalla, and Sik Kwong Lui on September 27, 2000 and is headquartered in Sunnyvale, CA.