QuantumClean and ChemTrace Show How to Reduce Cost of Ownership at SEMICON Taiwan

HAYWARD,California,Sept. 15,2020 -- Ultra Clean Holdings,Inc. (Nasdaq: UCTT),today announced that its Service Businesses,QuantumClean and ChemTrace,will demonstrate how their ultra-high purity chamber tool part cleaning,proprietary coatings and micro-contamination analytical testing can help reduce Cost of Ownership (CoO) for wafer fabs and OEMs. QuantumClean and ChemTrace will showcase these solutions at booth I2130 at SEMICON Taiwan 2020 at the Nangang Exhibition Center in Taipei September 23 – 25,2020.

"Customers are increasingly recognizing the advantage of our cleaning and analytical technology that optimizes productivity and helps to reduce total CoO throughout the product's lifecycle," said Bill Bentinck,President,UCT Semiconductor Services Business. "We are excited to demonstrate how our differentiated service offerings can improve operations by solving critical semiconductor process chamber part-related manufacturing challenges at SEMICON Taiwan."

A series of presentations will be offered to IDMs,OEMs,OPMs and foundries on how they may increase productivity and reduce CoO for ALD,CVD,diffusion,etch,ion implant and PVD process tools. Booth staff will show how cleaner chambers start-up quicker,faster part turnaround times reduce inventory,longer MTBCs improve productivity and reduce PM costs,and how less aggressive cleaning methods and recoating can extend part life.

About Ultra Clean Holdings,Inc.

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. Ultra Clean offers its customers an integrated outsourced solution for major subassemblies,improved design-to-delivery cycle times,design for manufacturability,prototyping and component manufacturing,and tool chamber parts cleaning and coating,as well as microcontamination analytical services. Ultra Clean is headquartered in Hayward,California. Additional information is available at www.uct.com.

Forward-looking Statements

The foregoing information contains,or may be deemed to contain,"forward-looking statements" (as defined in the US Private Securities Litigation Reform Act of 1995) which reflect our current views with respect to future events and financial performance. We use words such as "anticipates," "projection," "outlook," "forecast," "believes," "plan," "may," "expect," "future," "intends," "will," "estimates," "see," "predicts," and similar expressions to identify these forward-looking statements. Forward looking statements included in this press release include our expectations about the contributions of Ms. Seto to our Board of Directors. All forward-looking statements address matters that involve risks and uncertainties. Accordingly,the Company's actual results may differ materially from the results predicted or implied by these forward-looking statements. These risks,uncertainties and other factors also include,among others,those identified in "Risk Factors," "Management's Discussion and Analysis of Financial Condition and Results of Operations'' and elsewhere in our annual report on Form 10-K for the year ended December 28,2018 as filed with the Securities and Exchange Commission and subsequently filed quarterly reports on Form 10-Q. Ultra Clean Holdings,Inc. undertakes no obligation to publicly update or review any forward-looking statements,whether as a result of new information,future developments or otherwise unless required by law.

Contact:

Rhonda Bennetto

Vice President Investor Relations

rbennetto@uct.com

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