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 Tuesday, October 25, 2011 at 4:30 p.m. Eastern Time (1:30 p.m. Pacific Time). The conference call will cover 2011 third 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.

Mattson Technology Contact J. Michael Dodson Chief Financial Officer Mattson Technology, Inc. tel 510-657-5900 mike.dodson@mattson.com Investor & Media Contact Laura Guerrant-Oiye Principal Guerrant Associates tel 808-882-1467 lguerrant@guerrantir.com