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 will release financial results for its second quarter of Fiscal Year 2009, which ended March 31, 2009, on Thursday, April 23.

The press release, which will be issued prior to market open and available in the Investor Relations section of the company’s website, www.cabotcmp.com, will be followed by a conference call at 9:00 a.m. Central Time.

The conference call will be available via webcast from www.cabotcmp.com, or by phone at 866-730-5765. Callers outside the U.S. can dial 857-350-1589. The conference code for the call is 18663419.

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 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 Epoch employees. 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 where shaping, enabling and enhancing the performance of surfaces is critical to success. 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, Investor Relations, 630-499-2600
Amy_Ford@cabotcmp.com