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, February 1, 2012 at 4:30 p.m. Eastern Time (1:30 p.m. Pacific Time). The conference call will cover 2011 fourth quarter and year end financial results and current business conditions.

Mattson will also webcast 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, please 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. The company is a leading supplier of plasma and rapid thermal processing equipment to the global semiconductor industry, and operates in three primary product sectors: dry strip, rapid thermal processing (RTP) and etch. Through manufacturing and design innovation, Mattson Technology produces technologically advanced systems that provide productive and cost-effective solutions for customers fabricating current- and next-generation semiconductor devices. The company serves foundries, and memory and logic integrated device manufacturers in the United States, Europe, China, Japan, Korea, Singapore, Taiwan and other Asian countries. For more information, please contact Mattson Technology, Inc., 47131 Bayside Parkway, Fremont, CA, 94538. Telephone: +1-800-MATTSON/+1-510-657-5900. Internet: www.mattson.com.

Mattson Technology Contact Mike Dodson tel +1-(510) 492-6241 fax +1-(510) 492-5963 mike.dodson@mattson.com Investor & Media Contact Laura Guerrant-Oiye Guerrant Associates tel 808-882-1467 lguerrant@guerrantir.com