MATTSON TECHNOLOGY, INC. ANNOUNCES RESULTS FOR THE QUARTER AND YEAR ENDED DECEMBER 31, 1999

FREMONT, Calif., January 27, 2000 -- Mattson Technology, Inc. (Nasdaq:MTSN), a leading supplier of advanced process technology for semiconductor manufacturing, today announced financial results for the quarter and year ended December 31, 1999.

Net sales for the fourth quarter of 1999 were $35.8 million, compared to $13.9 million for the fourth quarter of 1998, an increase of 158 percent. The Company recorded net income for the fourth quarter of 1999 of $1.5 million or 8 cents per diluted share, compared to a net loss of $5.1 million or 33 cents per diluted share, for the fourth quarter of 1998. Fourth quarter bookings were $50.6 million, an increase of 244 percent from the fourth quarter of 1998, and backlog increased 147 percent to $56.1 million, compared to $22.7 million in the fourth quarter of 1998.

Quarter-to-quarter net sales increased 23%, up from $29.2 million for the third quarter of 1999. Net income for the fourth quarter of $1.5 million, or 8 cents per diluted share, represents an increase from a net income of $0.3 million, or 2 cents per diluted share last quarter. Bookings increased 42 percent, up from $35.6 million in the third quarter of 1999, resulting in a fourth quarter book-to-bill ratio of 1.4 to 1.0.

Net sales for the year ended December 31, 1999 increased 75 percent to $103.5 million, compared to $59.2 million for the year ended December 31, 1998. Net loss for the year ended December 31, 1999 was $0.8 million, or 5 cents per diluted share, compared to a net loss of $22.4 million, or $1.52 per diluted share, for the year ended December 31, 1998.

"The fourth quarter was our second profitable quarter for 1999, and we experienced 75 percent year-over-year growth in revenue," said Brad Mattson, CEO of Mattson Technology. "Our customers' capital spending outlook has improved, driven by improvements in economic conditions in Asia and in memory pricing." Mattson also added, "Our bookings strength in both third and fourth quarters reflects our customers' continued confidence in the ability of Mattson Technology to ramp production capacity while meeting their needs for innovative technology and productivity solutions."

This Press Release contains forward-looking statements regarding, among other matters, the Company's future financial performance. Forward looking statements address matters which are subject to a number of risks and uncertainties. In addition to the general risks associated with the development of complex technology, future results of the Company will depend on a variety of factors, including the timing of significant orders, the ability of the Company to bring new systems to market, the timing of new product releases by the Company's competitors, slowdowns in the semiconductor industry, and other competitive factors. Reference is made to the Company's filings with the Securities and Exchange Commission for further discussion of risks and uncertainties regarding the Company's business.

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