Semitool Penetrates Key Asian Memory and Logic Manufacturer; Expands Market Share in Growing Copper Damascene Sector

Semitool, Inc.
http://www.semitool.com , a leading manufacturer of wafer processing equipment for
the semiconductor industry, today announced it has added another major
memory device manufacturer to its growing list of copper (Cu) damascene
customers. The Asia-based company, which performs 300mm manufacturing in
both memory and logic, represents a key strategic addition to Semitool’s
expanding roster of memory-based customers.

Klaus Pfeifer, Semitool’s general manager for Copper ECD, said, "This
new business win represents another key step toward securing our position
as the dominant player in Cu memory applications. We look forward to
commencing work with this customer on our Raider platform."

Larry Murphy, president and chief operating officer, said, "This win is
vital to our overall Asian penetration strategy. We are very excited to
work with this new customer in developing their next generation Cu devices
for both logic and memory."

About Semitool, Inc.

Semitool designs, manufactures and supports highly engineered,
multi-chambered single-wafer and batch wet chemical processing equipment
used in the fabrication of semiconductor devices. The company’s primary
suites of equipment include electrochemical deposition for electroplating
copper, gold, solder and other metals; surface preparation systems for
cleaning, stripping and etching silicon wafers; and the cleaning of wafer
transport container systems. The company’s equipment is used in
semiconductor fabrication front end (FEOL) and back-end (BEOL) processes
including wafer-level packaging.

Headquartered in Kalispell, Montana, Semitool maintains sales and
support centers in the United States, Europe and Asia. The company’s stock
trades on the Nasdaq national Market under the symbol SMTL. For more
information, please visit the company’s website at http://www.semitool.com.

Semitool is a registered trademark of Semitool, Inc.

Safe Harbor Statement

This news release contains forward-looking statements, including
statements related to the securing a dominant position in the Cu memory
sector and the customer being vital to the company’s overall Asian
strategy. These statements are based on management’s assumptions as of the
date hereof and are subject to risks and uncertainties that are discussed
in our filings with the U.S. Securities and Exchange Commission, including
our Annual Report on Form 10-K for the fiscal year ended September 30,
2006. Many factors can adversely affect market share in a particular
application, including our products’ performance, competition with other
copper plating equipment manufacturers and technological developments
adverse to our products. Our business in general is subject to risks that
can cause actual results to differ materially from those anticipated in our
forward-looking statements, including, without limitation, demand being
adversely affected by the cyclicality in the semiconductor industry, the
financial condition of our customers, the company’s ability to timely
deliver and support its products, the risks associated with competing on a
global basis as well as a number of other risk factors described in our
Form 10-K. We assume no obligation to update forward-looking statements
that become untrue because of subsequent events.

Semitool, Inc.
http://www.semitool.com