Cabot Microelectronics Corporation Wins Supplier Award from Chartered Semiconductor Manufacturing.

AURORA, Ill. -- Cabot Microelectronics Corporation (NASDAQ:CCMP), the world's leading supplier of chemical mechanical planarization (CMP) polishing slurries to the semiconductor industry, announced today that it has received the Silver Materials Supplier Award from Chartered Semiconductor Manufacturing, one of the world's top dedicated semiconductor foundries. The award was presented to Cabot Microelectronics in Singapore on February 17 during Chartered's Supplier Day, an annual event for honoring the achievements of Chartered's global network of value-chain suppliers and partners.

William Noglows, Chairman, President and CEO of Cabot Microelectronics Corporation said, "We are honored to receive this award. We have spent the past few years executing our strategic initiatives of technology leadership, operations excellence and getting closer to our customers. We believe our efforts are making us more responsive to our customers and receiving this award is evidence of that."

Tang Yong "TY" Ang, Vice President of fab support operations at Chartered, said, "Cabot Microelectronics provided Chartered with excellent logistics support in phasing in a new CMP slurry at Chartered's 300-millimeter Fab 7 and improved the particle distribution in the slurry. We were pleased with Cabot Microelectronics' commitment and dedication in this initiative that helped reduce the process cost-of-ownership."

About Cabot Microelectronics Corporation

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 [phone].

Safe Harbor Statement

This news release may include statements that constitute "forward-looking statements" within the meaning of federal securities regulations. These forward-looking statements include statements related to future sales and operating results, company and industry growth and trends, growth of this market, international events, product performance, new product introductions and development of new products and technologies by Cabot Microelectronics. These forward-looking statements involve a number of risks, uncertainties, and other factors, including those described from time to time in Cabot Microelectronics' filings with the Securities and Exchange Commission (SEC), that could cause the actual results to differ materially from those described by these forward-looking statements. In particular, see "Risks Relating to Our Business" in Management's Discussion and Analysis in our quarterly report on Form 10-Q for the quarter ended December 31, 2005, and our Annual Report on Form 10-K for the fiscal year ended September 30, 2005, both filed with the SEC. Cabot Microelectronics Corporation assumes no obligation to update this forward-looking information.