Item 2.02 Results of Operations and Financial Condition.

On April 23, 2009, Cabot Microelectronics Corporation issued a press release entitled "Cabot Microelectronics Corporation Reports Results for Second Quarter of Fiscal 2009," a copy of which is attached hereto as Exhibit 99.1 and incorporated herein by reference. The press release contains financial and other information including that related to our second fiscal quarter ended March 31, 2009. The press release also includes cautionary statements identifying important factors that could cause actual results to differ materially from those described by any forward-looking statements.

This information is being furnished pursuant to Item 2.02 of Form 8-K and shall not be deemed "filed" for purposes of Section 18 of the Securities and Exchange Act of 1934, as amended (the "Exchange Act"), or incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing.

Item 9.01 Financial Statements and Exhibits.

(c) Exhibits

The following exhibit is being furnished, not filed, herewith pursuant to Item 2.02 of Form 8-K:

99.1 Press release, dated April 23, 2009, entitled "Cabot Microelectronics Corporation Reports Results for Second Quarter of Fiscal 2009."

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