Cabot Microelectronics Corporation (Nasdaq: CCMP), the world’s leading supplier of chemical mechanical planarization (CMP) slurries and growing CMP pad supplier to the semiconductor industry, announced today that it is scheduled to present at the J.P. Morgan 37th Annual Global Technology, Media and Telecom Conference in Boston, Massachusetts, at 8:40 a.m. Eastern Time, Wednesday, May 20, 2009. Forward looking and other material information may be discussed during the presentation. The presentation will be available to all interested parties via webcast from its site at www.cabotcmp.com.

About Cabot Microelectronics

Cabot Microelectronics Corporation, headquartered in Aurora, Illinois, is the world's leading supplier of CMP polishing slurries and growing CMP pad supplier to the semiconductor industry. 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. Since becoming an independent public company in 2000, the company has grown to approximately 900 employees on a global basis, including employees of its newly acquired Epoch subsidiary. The company's vision is to become the world leader in shaping, enabling and enhancing the performance of surfaces, so the company is leveraging its expertise in CMP slurry formulation, materials and polishing techniques developed for the semiconductor industry and applying it to demanding surface modification applications in other industries. For more information about Cabot Microelectronics Corporation, visit www.cabotcmp.com or contact Amy Ford, Director of Investor Relations at (630) 499-2600.

Cabot Microelectronics Corporation
Amy Ford, Director of Investor Relations
(630) 499-2600