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 Morgan Stanley Small Cap Executive Conference in New York City, at 1:45 p.m. Eastern Time, Wednesday, June 14, 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 available on the 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. Since becoming an independent public company in 2000, the company has grown to approximately 650 employees who work at research and development labs, sales and business offices, manufacturing facilities and customer service centers in China, France, Germany, Japan, Singapore, South Korea, Taiwan, the United Kingdom and the United States. The company's products play a critical role in the production of the most advanced semiconductor devices, enabling the manufacture of smaller, faster and more complex devices by its customers. In addition to its core CMP business, the company's vision looks beyond the semiconductor industry to become 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 Ven Horst, Director of Investor Relations at (630) 375-5412.