MTSN Mattson Technology, Inc.

Mattson Technology, Inc. (NASDAQ: MTSN), a leading supplier of advanced process equipment used to manufacture semiconductors, announced that the company will host a conference call on Wednesday, July 21, 2010 at 5:30 p.m. Eastern Time (2:30 p.m. Pacific Time). The conference call will cover 2010 second quarter financial results and current business conditions.

Mattson will also web cast a slide presentation in conjunction with the conference call. To access the live web cast and slide presentation, please visit Mattson's website www.mattson.com under the 'Investors' section.

To access the live conference call, dial (970) 315-0417.

A digital replay of the conference call will be available on Mattson's website for one week following the live broadcast.

About Mattson Technology, Inc. Mattson Technology, Inc. designs, manufactures and markets semiconductor wafer processing equipment used in the fabrication of integrated circuits. We are a leading supplier of plasma and rapid thermal processing equipment to the global semiconductor industry, and operate in three primary product sectors: Dry Strip, Rapid Thermal Processing and Etch. Through manufacturing and design innovation, we have produced technologically advanced systems that provide productive and cost-effective solutions for customers fabricating current- and next-generation semiconductor devices. For more information, please contact Mattson Technology, Inc., 47131 Bayside Parkway, Fremont, CA, 94538. Telephone: (800) MATTSON/(510) 657-5900. Internet: www.mattson.com.

"Safe Harbor" Statement Under the Private Securities Litigation Reform Act of 1995: This news release contains forward-looking statements. Forward-looking statements address matters that are subject to a number of risks and uncertainties that can cause actual results to differ materially. Such risks and uncertainties include, but are not limited to: end-user demand for semiconductors; customer demand for semiconductor manufacturing equipment; the timing of significant customer orders for the Company's products; customer acceptance of delivered products and the Company's ability to collect amounts due upon shipment and upon acceptance; the Company's ability to timely manufacture, deliver and support ordered products; the Company's ability to bring new products to market and to gain market share with such products; customer rate of adoption of new technologies; risks inherent in the development of complex technology; the timing and competitiveness of new product releases by the Company's competitors; the Company's ability to align its cost structure with market conditions; and other risks and uncertainties described in the Company's Forms 10-K, 10-Q and other filings with the Securities and Exchange Commission. The Company assumes no obligation to update the information provided in this news release.

Mattson Technology Contact Andy Moring tel +1-(510) 492-6241 fax +1-(510) 492-5963 andy.moring@mattson.com Investor & Media Contact Laura Guerrant-Oiye Guerrant Associates tel 808-882-1467 lguerrant@guerrantir.com