Mattson Technology to Participate in the Eighth Annual Craig-Hallum Institutional Investor Conference

FREMONT, CA, May 31 (MARKET WIRE) --
Mattson Technology, Inc. (NASDAQ: MTSN), a leading supplier of advanced
process equipment used to manufacture semiconductors, today announced
that the Company will be participating in the Eighth Annual Craig-Hallum
Institutional Investor Conference on June 1, 2011. The conference is
being held at the Radisson Plaza Hotel in Minneapolis.

The conference is comprised of a number of one-on-one meetings arranged
by Craig-Hallum with investors and no formal presentation or webcast will
be available for this conference. Investors planning to attend the
conference should contact their Craig-Hallum representative to arrange a
meeting.

Presentation materials will be available on the investor relations
section of the Company's website at 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: Company
expectations with respect to continued growth of its business; growth of
the industry and the size of the Company's served available market; 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 cash
position overall, especially as a result of payments made for inventory
and the related collections upon shipment of such inventory; end-user
demand for semiconductors, including the growing mobility electronics
industry; customer demand for semiconductor manufacturing equipment,
including as a result of Greenfield fab plans; the Company's ability to
timely manufacture, deliver and support ordered products; the Company's
ability to bring new products to market, to gain market share with such
products and the overall mix of the Company's 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.

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
Andy Moring
Chief Financial Officer
Mattson Technology, Inc.
tel 510-657-5900
fax 510-492-5963
andy.moring@mattson.com

Investor & Media Contact
Laura Guerrant-Oiye
Principal
Guerrant Associates
tel 808-882-1467
lguerrant@guerrantir.com

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