UCT to Present at the Stifel Technology, Internet and Media Conference

HAYWARD, Calif., May 25, 2017 - Ultra Clean Holdings, Inc. (Nasdaq: UCTT), a leading developer and supplier of critical systems and subsystems for the semiconductor capital equipment, flat panel, medical, energy and research industries, today announced Jim Scholhamer, Chief Executive Officer and Sheri Brumm, Senior Vice President and Chief Financial Officer will be presenting at the Stifel Technology, Internet and Media Conference on Tuesday, June 6, 2017 at 10:55 am PT the Fairmont Hotel, San Francisco, CA.

An audio webcast of the presentation will be made available on the company's website at www.uct.com shortly after the presentation.

About Ultra Clean Holdings, Inc.

Ultra Clean Holdings, Inc. is a leading developer and supplier of critical systems and subsystems for the semiconductor capital equipment, flat panel, medical, energy and research industries. Ultra Clean offers its customers an integrated outsourced solution for gas delivery systems and other subassemblies, improved design-to-delivery cycle times, component neutral design and manufacturing and component testing capabilities. Ultra Clean's customers are primarily original equipment manufacturers for the semiconductor capital equipment, flat panel, medical, and energy and research industries. Ultra Clean is headquartered in Hayward, California. Additional information is available at www.uct.com.

Contact:

Annie Leschin

(415) 775-1788

annie@streetsmartir.com

SOURCE Ultra Clean Holdings, Inc.

Web Site: http://www.uct.com

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