ChemTrace Shows How Micro-Contamination Control Improves Fab Results at SEMICON Korea

HAYWARD,California,Jan. 16,2020 --Ultra Clean Holdings,Inc. (Nasdaq: UCTT),today announced that its Services Business,ChemTrace,will demonstrate how its micro-contamination analytical testing can help reduce Cost of Ownership (CoO) for wafer fabs and OEMs. ChemTrace will showcase these solutions at booth B524 at SEMICON Korea 2020 at the COEX in Seoul,February 5- 7,2020.

"Customers are increasingly recognizing the advantage of our analytical technology that optimizes micro-contamination control and risk management to improve fab results," said Bill Bentinck,President,UCTT Semiconductor Services Business. "We are excited to demonstrate how our broad-based engagements enable us to customize our approach ensuring our analytical solutions truly address customers' requirements and support robust contamination monitoring programs at SEMICON Korea."

Our representatives will discuss how ChemTrace's highly qualified chemists,engineers and technologists engage closely with customers to reliably provide micro-contamination analysis of chamber parts,wafers/depositions,chemicals,cleanroom materials,water and airborne molecular contamination.

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," "expect," "future," "intends," "may," "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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