MatrixOne to Release First Quarter Financial Results on November 15, 2005

As previously announced by MatrixOne, Inc. (NASDAQ:
MONEE), a leading provider of collaborative product lifecycle
management (PLM) solutions for the value chain(TM), the Company plans
to release its financial results for the first quarter ended October
1, 2005 on Tuesday, November 15, 2005, after the market closes. The
Company's management team plans to host a live conference call and
webcast at 5:30 p.m. eastern time today to discuss the financial
results as well as management's outlook for the business. The
conference call may be accessed in the United States by dialing (800)
230-1096 and using passcode "MONE". The conference call may be
accessed outside of the United States by dialing [phone] and
using passcode "MONE". The conference call will be simultaneously
webcast on the Company's Investor Relations website, which can be
accessed at www.matrixone.com/investor. A replay of the webcast will
be available two hours after the call.

   About MatrixOne

   MatrixOne, Inc. (NASDAQ: MONEE), a leading global provider of
collaborative product lifecycle management (PLM) software and
services, enables companies to accelerate product innovation to
achieve top line revenue growth and improve bottom line profitability.
With world-class PLM solutions and a commitment to customer success,
MatrixOne is focused on helping companies across the automotive,
aerospace & defense, consumer, machinery, medical device,
semiconductor and high-tech industries solve their most challenging
new product development and introduction problems. More than 800
companies use MatrixOne's solutions to drive business value and gain a
competitive advantage, including industry leaders such as BAE Systems,
Bosch, Comau, General Electric, Honda, Johnson Controls, Linde AG,
NCR, Nokia, Philips, Porsche, Procter & Gamble, Sony Ericsson,
STMicroelectronics and Toshiba. MatrixOne (www.matrixone.com) is
headquartered in Westford, Massachusetts, with locations throughout
North America, Europe and Asia-Pacific.

   MatrixOne and the MatrixOne logo are registered trademarks, and "a
leading provider of collaborative product lifecycle management (PLM)
solutions for the value chain" is a trademark of MatrixOne, Inc. All
other trademarks and service marks are the property of their
respective owners.

   Safe Harbor Statement under the Private Securities Litigation
Reform Act of 1995 - Forward-looking statements in this release do not
constitute guarantees of future performance. For this purpose, any
statements contained herein that are not statements of historical fact
may be deemed to be forward-looking statements. Without limiting the
foregoing, the words "believes," "anticipates," "plans," "expects,"
"intends," and similar expressions are intended to identify
forward-looking statements. Such forward-looking statements are
subject to risks and uncertainties that could cause our actual results
to differ materially from those anticipated. For a more detailed
discussion of the risks and uncertainties of our business, please
refer to our periodic reports and registration statements filed with
the Securities and Exchange Commission, including our Annual Report on
Form 10-K for the fiscal year ended July 2, 2005 and our Quarterly
Report on Form 10-Q for the fiscal quarter ended April 2, 2005. The
forward-looking statements included in this press release represent
our views as of the date of this press release. We anticipate that
subsequent events and developments may cause our views to change. We
assume no obligation to update any forward-looking information
contained in this press release or with respect to the announcements
described herein.