Semitool to Announce Third Quarter Financial Results on Tuesday, July 28, 2009

KALISPELL, MT, Jul 14 (MARKET WIRE) --
Semitool, Inc. (NASDAQ: SMTL), a leading manufacturer of wafer processing
equipment for the semiconductor industry, today announced it will issue
its third quarter financial results after the stock market closes on
Tuesday, July 28, 2009.

Following the release of its results, the company will host a conference
call and simultaneous webcast. The call will begin at 5 p.m. Eastern and
will be accessible by dialing 877-356-3834 (706-679-0445 for international
callers) and entering the passcode 19903645.

An audio replay will be accessible approximately two hours after the call
has ended and will be available until 11:59 p.m. Eastern on July 30, 2009.
The replay can be accessed by dialing 800-642-1687 (706-645-9291 for
international callers) and entering the passcode 19903645.

The webcast will be available via the Internet at www.semitool.com.
Webcast participants should access the website at least 10 minutes early
to register and download any necessary audio software. A replay of the
webcast will be available for 90 days.

About Semitool, Inc.

Semitool designs, manufactures and supports highly engineered,
multi-chamber 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 systems for
electroplating copper, gold, solder and other metals; surface preparation
systems for cleaning, stripping and etching silicon wafers; and wafer
transport container cleaning systems. The company's equipment is used in
semiconductor fabrication front-end and back-end 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 Nasdaq under the symbol SMTL. For more information, please visit the
company's website at www.semitool.com.

Semitool is a registered trademark of Semitool, Inc.

Contacts:
SEMITOOL, INC.
Larry Viano
Chief Financial Officer
406-752-2107
Email Contact

Pfeiffer High Investor Relations, Inc.
Geoff High
303-393-7044

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