CCMP CMC Materials Inc

Cabot Microelectronics Corp. (Nasdaq:CCMP), the leading supplier of chemical mechanical planarization (CMP) slurries to the semiconductor industry, has announced its Annual Meeting of Shareholders will be held Tuesday, March 7, 2006, at 8:00 a.m., Central Time. Presentation material for the Annual Meeting will be available to all interested parties in the Investor Relations section of the company's website, www.cabotcmp.com. In addition, callers within the U.S. can dial (800) 893-3008, at 8:00 a.m. Central Time. Callers outside the U.S. can dial (706) 634-5531. The conference ID for the call is 6124165. A transcript of the formal comments made during the Annual Meeting will be available in the Investor Relations section of the company's website. About Cabot Microelectronics Cabot Microelectronics Corporation, headquartered in Aurora, Illinois, is the world's leading supplier of CMP slurries used in semiconductor and data storage manufacturing. The company's products play a critical role in the production of advanced semiconductor devices, enabling its customers to manufacture smaller, faster and more complex devices. As the company continues investing in its core CMP business, it is also looking beyond the semiconductor industry to pursue its vision to "be the world leader in shaping, enabling and enhancing the performance of surfaces". For more information about Cabot Microelectronics Corporation visit www.cabotcmp.com or contact Barbara A. Ven Horst, Director of Investor Relations at (630) 499-2600.