Press Release

AURORA, Ill., July 14 /PRNewswire/ -- Cabot Microelectronics Corporation (Nasdaq: CCMP), the leading supplier of chemical mechanical planarization (CMP) polishing slurries to the semiconductor industry, today announced that it will release financial results for its fiscal 2003 third quarter ended June 30, 2003 on Thursday, July 24, 2003.

The press release, which will be issued prior to the market opening and available in the Investor Relations section of the company's website at www.cabotcmp.com , will be followed by a conference call at 10:00 a.m. Eastern time, 9:00 a.m. Central time. Matthew Neville, Cabot Microelectronics' Chairman, President and CEO will host the call.

The conference call will be available to all interested parties via webcast from its site at www.cabotcmp.com or by phone at 800-923-0061. Callers outside the U.S. can dial 706-634-5545.

For those who cannot listen to the live broadcast, a replay will be available through August 7, 2003 by calling 800-642-1687 or 706-645-9291, access code 7436114. A transcript of the conference call also will be available in the Investor Relations section of the company's site at www.cabotcmp.com .

About Cabot Microelectronics

Cabot Microelectronics, headquartered in Aurora, Ill., is the leading supplier of CMP slurries for polishing various materials used in semiconductor manufacturing processes. The company's products play a critical role in its customers' manufacturing processes, enabling the manufacture of smaller, faster and more complex devices. Cabot Microelectronics is traded on Nasdaq under the symbol CCMP. For more information on Cabot Microelectronics, visit our website www.cabotcmp.com or call 630-499-2600.

    Contact:
    Bill Johnson
    Vice President and Chief Financial Officer
    Cabot Microelectronics Corporation
    +1-630-375-6631

SOURCE  Cabot Microelectronics Corporation
    -0-                             07/14/2003
    /CONTACT:  Bill Johnson, Vice President and Chief Financial Officer of
Cabot Microelectronics Corporation, +1-630-375-6631/
    /Web site:  http://www.cabotcmp.com /
    (CCMP)

CO:  Cabot Microelectronics Corporation
ST:  Illinois
IN:  CHM
SU:  CCA MAV



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0648 07/14/2003 08:30 EDT http://www.prnewswire.com