Cabot Microelectronics Corporation to Participate in Techamerica Conferences

Cabot Microelectronics Corporation (NASDAQ: CCMP), the world's leading supplier of chemical mechanical planarization (CMP) polishing slurries and a growing CMP pad supplier to the semiconductor industry, today announced that it is scheduled to participate in the TechAmerica 2011 Classic in San Diego on November 7, 2011 and the TechAmerica Illinois Investor Forum at NASDAQ in New York on November 15, 2011. For more information, or to arrange a meeting with management, please contact Trisha Tuntland of Cabot Microelectronics at [e-mail].

Investor materials are available on the company’s website at www.cabotcmp.com.

ABOUT CABOT MICROELECTRONICS CORPORATION

Cabot Microelectronics Corporation, headquartered in Aurora, Illinois, is the world's leading supplier of CMP polishing slurries and a growing CMP pad supplier to the semiconductor industry. 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. The company’s mission is to create value by developing reliable and innovative solutions, through close customer collaboration, that solve today’s challenges and help enable tomorrow’s technology. Since becoming an independent public company in 2000, the company has grown to approximately 1,000 employees on a global basis. For more information about Cabot Microelectronics Corporation, visit www.cabotcmp.com or contact Trisha Tuntland, Manager of Investor Relations at [phone].

CONTACT: Trisha Tuntland
         Manager, Investor Relations
         [phone]