EXHIBIT 99.1

PRESS RELEASE


                                                                                              Contact:
                                                                                            Trisha Tuntland
                                                                                            Director of Investor Relations
                                                                                           Cabot Microelectronics Corporation
                                                                                              (630) 499-2600

CABOT MICROELECTRONICS CORPORATION REPORTS RESULTS
FOR FOURTH QUARTER AND FULL FISCAL YEAR 2015
·
Quarterly Revenue of $100.1 Million; Gross Profit Margin of 52.0 Percent, Up 290 Basis Points Year-Over-Year; Earnings Per Share of $0.50
·
Annual Revenue of $414.1 Million; Gross Profit Margin of 51.3 Percent, Up 350 Basis Points Year-Over-Year; Record Earnings Per Share of $2.26
·
Acquisition of NexPlanar Corporation, a Supplier of Advanced CMP Pad Solutions
·
Balance Sheet Remains Strong With Post-Acquisition Cash Balance of Approximately $225 Million

AURORA, IL, October 29, 2015 – Cabot Microelectronics Corporation (Nasdaq:  CCMP), the world's leading supplier of chemical mechanical planarization (CMP) polishing slurries and a growing CMP pad supplier to the semiconductor industry, today reported financial results for its fourth quarter and full fiscal year 2015, which ended September 30.

During the fourth fiscal quarter, total revenue was $100.1 million, driven by record revenue from the company's CMP slurries for polishing tungsten.  The company achieved a gross profit margin of 52.0 percent of revenue, an increase of 290 basis points over the same quarter last year, diluted earnings per share of $0.50 and cash flow from operations of $24.9 million.

For the full fiscal year, the company generated revenue of $414.1 million, including record annual revenue from tungsten slurries, which grew 10.3 percent year-over-year.  The company achieved a gross profit margin of 51.3 percent of revenue, or 350 basis points higher than last year, and record diluted earnings per share of $2.26, representing an increase of 10.8 percent compared to last year.  Cash flow from operations was $98.7 million for the full fiscal year.  As of September 30, 2015, the company's balance sheet reflected a cash balance of $354.2 million and $164.1 million of debt outstanding.

As announced on October 22, the company completed its acquisition of NexPlanar Corporation, a U.S.-based company that specializes in advanced CMP pad solutions for the semiconductor industry, and funded the acquisition price of approximately $142.3 million from its available cash balance.  The company's post-acquisition cash balance is approximately $225 million, including approximately $15 million of cash from NexPlanar.

"We are pleased with our strong financial performance for the full fiscal year, within a challenging industry environment," said David Li, President and CEO of Cabot Microelectronics.  "This fiscal year was highlighted by record revenue from our slurries for polishing tungsten, as we have been working closely with our strategic customers to support their transitions to FinFET and 3D memory.  In addition, we focused on the broad transformation of our slurries for dielectrics applications, as we advanced the commercialization of a new family of much higher performing solutions, which we believe will contribute to future profitable growth for our company.  The successful execution of our business initiatives enabled us to expand our gross margin percentage to its highest level since 2002, and achieve a record level of profit for our company, representing 11 percent earnings growth compared to the prior year."

Mr. Li continued, "Further, we are delighted to have completed our acquisition of NexPlanar, which expands our pad product offerings with complementary technology that has been adopted in advanced applications by technology leading customers.  By delivering a broader range of innovative, high-quality, high-performing and reliable CMP solutions, including performance-differentiated slurry and pad consumable sets, we believe we can better meet the needs of our customers around the world, and fuel continued profitable growth for our company.  Over the next several months, we will be integrating NexPlanar with our CMP consumables business, with a focus on leveraging our extensive global infrastructure, including our direct sales channel, supply chain capabilities and quality systems, to speed adoption of NexPlanar products.  Based on our achievements in fiscal 2015 to strengthen and grow our CMP consumables business, along with our very recent acquisition of NexPlanar, I am confident we are entering fiscal 2016 as a stronger company."

Key Financial Information

Total fourth fiscal quarter revenue of $100.1 million represents a decrease of 13.9 percent compared to the record revenue recorded in the same quarter last year.  Revenue from the company's CMP tungsten slurries represented a record level; revenue from all other major product areas decreased.  The decrease reflects continued softness in demand within the global semiconductor industry, a departure from traditional seasonal strength in demand the company has historically experienced during its fourth fiscal quarter, and business losses in slurries for dielectrics and data storage applications, all of which the company has previously disclosed.  Foreign exchange effects reduced revenue by $3.0 million, primarily due to the weaker Korean won and Japanese yen versus the U.S. dollar.

Total revenue for the full fiscal year was $414.1 million, which represents a 2.5 percent decrease from $424.7 million in fiscal 2014.  The company achieved record annual revenue from tungsten slurries, which grew 10.3 percent, and also recorded higher revenue from its Engineered Surface Finishes product area; revenue from all other major product areas decreased.  Foreign exchange effects reduced revenue by $7.5 million, primarily due to the weaker Japanese yen and Korean won versus the U.S. dollar.

Gross profit, expressed as a percentage of revenue, was 52.0 percent this quarter, which is 290 basis points higher than the 49.1 percent reported in the same quarter a year ago.  Gross profit percentage increased primarily due to product mix and benefits associated with foreign exchange rate changes, primarily the weaker Japanese yen, partially offset by lower sales volume.

Gross profit margin for the full fiscal year was 51.3 percent of revenue, or 350 basis points higher than last year.  Previously, the company had expected its gross profit margin for the full fiscal year to be between 50 and 51 percent of revenue.  Gross profit margin increased from 47.8 percent of revenue in fiscal 2014, primarily due to product mix, foreign exchange rate changes, and the absence of an asset impairment charge recorded last year.  These benefits were partially offset by higher costs associated with inventory write-offs related to raw material quality recorded during the third fiscal quarter, which the company previously disclosed.  For full fiscal year 2016, the company currently expects its gross profit margin to be between 49 and 51 percent of revenue, including NexPlanar.

The following information was filed by Cabot Microelectronics Corp (CCMP) on Thursday, October 29, 2015 as an 8K 2.02 statement, which is an earnings press release pertaining to results of operations and financial condition. It may be helpful to assess the quality of management by comparing the information in the press release to the information in the accompanying 10-K Annual Report statement of earnings and operation as management may choose to highlight particular information in the press release.

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