MATTSON TECHNOLOGY, INC. ANNOUNCES COMPLETION OF ITS PUBLIC OFFERING OF 3 MILLION SHARES OF ITS COMMON STOCK

FREMONT, Calif. — March 8, 2000 — Mattson Technology, Inc. (Nasdaq: MTSN) has announced that it completed its public offering of 3,000,000 shares of its common stock. The public offering price was $42.50 per share. Net proceeds to Mattson, before offering expenses, were approximately $119.9 million. Mattson has granted the underwriters the right to purchase up to an additional 450,000 shares to cover over-allotments.

Morgan Stanley & Co. Incorporated acted as lead manager and Chase H&Q, Bear, Stearns & Co. Inc., Needham & Company, Inc. and Wit SoundView acted as co-managers of the underwriting group. A copy of the prospectus may be obtained from the offices of Morgan Stanley & Co. Incorporated, 1585 Broadway, New York, New York 10036.

This press release shall not constitute an offer to sell or a solicitation to buy the offered shares, nor shall there be any sale of the offered shares in any state in which such offer, solicitation or sale would be unlawful prior to the registration or qualification under the securities laws of any such state. The offering will be made only by means of a prospectus.

About Mattson Technology

Mattson Technology Inc., is a leading supplier of thermal, plasma and wet semiconductor processing equipment. The company's products combine advanced process technology on a high productivity platform, backed by industry-leading support. Since beginning operations in 1989, the company's core vision has been to help bring technology leadership and productivity gains to semiconductor manufacturers worldwide. Headquartered in Fremont, Calif., the company maintains sales and support centers throughout the United States, Europe, Asia/Pacific and Japan. For more information, please contact Mattson Technology Inc., 2800 Bayview Drive, Fremont, Calif. 94538. Telephone: (800) MATTSON. Fax: (510) 657-0165. Internet:www.mattson.com