8-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C.  20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934

Date of Report (date of earliest event reported):

September 27, 2010

Cabot Microelectronics Corporation

(Exact name of registrant as specified in its charter)

Delaware	000-30205	36-4324765
(State or other jurisdiction of incorporation)	(Commission File Number)	(IRS Employer Identification)

870 Commons Drive, Aurora, Illinois	60504
(Address of principal executive offices)	(Zip Code)

(630) 375-6631

(Registrant’s telephone number, including area code)

Not applicable

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

o   Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

o   Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

o   Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

o   Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

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Item 8.01                      Other Events

On September 27, 2010, Cabot Microelectronics Corporation issued a press release entitled “Cabot Microelectronics Corporation Signs Non-Binding Memorandum of Understanding to Expand Capabilities in South Korea.”  A copy of the press release is attached hereto as Exhibit 99.1 and incorporated herein by reference.

This information is being furnished pursuant to Item 8.01 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 8.01 of Form 8-K:
	99.1           Press release, dated September 27, 2010, entitled “Cabot Microelectronics Corporation Signs Non-Binding Memorandum of Understanding to Expand Capabilities in South Korea.”

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SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

	CABOT MICROELECTRONICS CORPORATION
Date: September 27, 2010	By:	/s/ WILLIAM S. JOHNSON
		William S. Johnson
		Vice President and Chief Financial Officer
		[Principal Financial Officer]

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INDEX TO EXHIBITS

Exhibit Number	Title
99.1	Press release, dated September 27, 2010, entitled “Cabot Microelectronics Corporation Signs Non-Binding Memorandum of Understanding to Expand Capabilities in South Korea.”

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EX-99.1

EXHIBIT 99.1

PRESS RELEASE

 Contact:

 Amy Ford

 Director, Investor Relations

 Cabot Microelectronics Corporation

(630) 375-5412

CABOT MICROELECTRONICS CORPORATION SIGNS NON-BINDING MEMORANDUM OF UNDERSTANDING TO EXPAND CAPABILITIES IN SOUTH KOREA

AURORA, Illinois – September 27, 2010 – Cabot Microelectronics Corporation (NASDAQ: CCMP), the world's leading supplier of chemical mechanical planarization (CMP) polishing slurries and growing CMP pad supplier to the semiconductor industry, announced today that it has entered into a non-binding Memorandum of Understanding (MOU) with the Gyeonggi Province of South Korea to potentially establish manufacturing and research and development capabilities in the region. The signing ceremony was held at Cabot Microelectronics Corporation's headquarters in Aurora, Illinois on September 27, 2010 and was attended by the Governor of Gyeonggi Province, Moon-Soo Kim.

The MOU reflects a potential aggregate investment by the Company of approximately US$10 million in Gyeonggi Province.  The potential investment would provide expanded capabilities in South Korea to serve the needs of the Company’s advanced memory customers.   Ben Han, Cabot Microelectronics' Country Manager of Korea, stated, “This potential investment supports our strategic initiative to get closer to our Asian customers and our continued focus on building strong customer relationships and supply capabilities in Korea.”

ABOUT CABOT MICROELECTRONICS CORPORATION

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 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 925 employees on a global basis. For more information about Cabot Microelectronics Corporation, visit www.cabotcmp.com or contact Amy Ford, Director of Investor Relations at 630-499-26 00.

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, contraction or trends; growth or contraction of the markets in which the company participates; international events or various economic factors; product performance; the generation, protection and acquisition of intellectual property, and litigation related to such intellectual property; new product introductions; development of new products, technologies and markets; the acquisition of or investment in other entities; uses and investment of the company’s cash balance; and the construction of facilities by Cabot Microelectronics Corporation. These forwar d-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 actual results to differ materially from those described by these forward-looking statements. In particular, see “Risk Factors" in the company’s quarterly report on Form 10-Q for the quarter ended June 30, 2010 and in the company’s annual report on Form 10-K for the fiscal year ended September 30, 2009, both filed with the SEC. Cabot Microelectronics assumes no obligation to update this forward-looking information.