CCMP CMC Materials Inc

Cabot Microelectronics Corporation (Nasdaq:CCMP), the world's leading supplier of chemical mechanical planarization (CMP) slurries to the semiconductor industry, announced today that it is scheduled to present at the 8th Annual Needham & Company, LLC Growth Conference in New York, at 4:30 p.m. Eastern Time, Wednesday, January 11, 2006. Forward looking and other material information may be discussed during the presentation, which will be webcast from the company's site, www.cabotcmp.com. The presentation material will also be archived on the site for 30 days. About Cabot Microelectronics Cabot Microelectronics Corporation, headquartered in Aurora, Illinois, is the world's leading supplier of CMP slurries for polishing various materials used in semiconductor manufacturing processes. The company's products play a critical role in the production of advanced semiconductor devices, enabling the manufacture of smaller, faster and more complex devices by its customers. For more information about Cabot Microelectronics Corporation, visit www.cabotcmp.com or contact Barbara Ven Horst, Director of Investor Relations at (630) 499-2600.