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Business

Ultra Clean Holdings, Inc. ("UCT", the "Company" or "We") was founded in November 2002 for the purpose of acquiring Ultra Clean Technology Systems and Services, Inc. a US-based company founded in 1991 by Mitsubishi Corporation and operated as a subsidiary of Mitsubishi. UCT became a publicly traded company in March 2004. In 2006, we acquired Sieger Engineering, Inc. to better position ourselves as a subsystem supplier primarily to the semiconductor and display capital equipment industries. Sieger Engineering merged into Ultra Clean Technology Systems and Service, Inc. in July of 2016. To facilitate operations in Asia, Ultra Clean Technology (Shanghai) Co., Ltd ("UCTS") and Ultra Clean Micro-Electronics Equipment (Shanghai) Co., Ltd. ("UCME") were established in China in 2005 and 2007, respectively, and Ultra Clean Asia Pacific, Pte, Ltd. was established in Singapore in 2008. UCTS merged into UCME in December of 2015. Our July 2012 acquisition of American Integration Technologies LLC ("AIT") added to our existing customer base in the semiconductor and medical spaces and provided additional manufacturing capabilities. In February 2015, we acquired Marchi Thermal Systems, Inc. ("Marchi") and in July 2015, we acquired MICONEX s.r.o ("Miconex"), both privately held companies with a majority of their revenues in the semiconductor market. Marchi designs and manufactures specialty heaters, thermocouples and temperature controllers, delivering flexible heating elements and thermal solutions to our customers. The Company believes heaters are increasingly critical in equipment design for the most advanced semiconductor nodes. Miconex is a provider of advanced precision fabrication of plastics that has expanded our capabilities with existing customers. In May 2018, Marchi and Miconex changed their names to UCT Thermal Solutions, Inc. ("Thermal") and to UCT Fluid Delivery Solutions s.r.o ("FDS"), respectively.

In August 2018, the Company acquired Quantum Global Technologies, LLC ("QGT"), a provider of ultra-high purity outsourced parts cleaning, process tool part recoating, surface treatment and analytical services to the semiconductor and related industries, for a total purchase price of approximately $340.8 million. See Note 5 to the Company's Consolidated Financial Statements for further information about the acquisition of QGT.

We are a global leader in the design, engineering, and manufacture of production tools, modules and subsystems for the semiconductor capital equipment industry and industry segments with similar requirements including display, consumer and medical. We focus on providing specialized engineering and manufacturing solutions for these applications. We enable our customers to realize lower manufacturing costs and reduced design-to-delivery cycle times while maintaining high quality standards.

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