Ultra Clean Holdings, Inc. is a leading developer and supplier of critical subsystems, ultra-high purity cleaning and analytical services primarily for the semiconductor industry. The company is headquartered in Hayward, California and has operations in Asia, Europe, and the United States. Ultra Clean Holdings was founded in 1991 and has since grown to become a leading provider of critical subsystems and services for the semiconductor industry. The company's products and services are used in the production of semiconductors, flat panel displays, and other high-tech products.