Entegris and CMC Materials Receive China Antitrust Clearance for Pending Acquisition

Entegris, Inc. (NASDAQ: ENTG) and CMC Materials, Inc. (NASDAQ: CCMP) today announced that China’s State Administration for Market Regulation has given antitrust clearance for Entegris’ previously announced acquisition of CMC Materials. The transaction has now received all required regulatory clearances. Entegris and CMC Materials anticipate that the transaction will close on or about July 6, 2022, subject to the satisfaction of the remaining customary closing conditions.

The parties announced their agreement for Entegris to acquire CMC Materials in a cash and stock transaction on December 15, 2021. The transaction brings together two highly complementary portfolios, creating the industry’s most comprehensive and innovative electronic materials offering.

About Entegris

Entegris is a world-class supplier of advanced materials and process solutions for the semiconductor and other high-tech industries. Entegris has approximately 6,800 employees throughout its global operations and is ISO 9001 certified. It has manufacturing, customer service and/or research facilities in the United States, Canada, China, France, Germany, Israel, Japan, Malaysia, Singapore, South Korea and Taiwan. Additional information can be found at www.entegris.com.

About CMC Materials, Inc.

CMC Materials, Inc., headquartered in Aurora, Illinois, is a leading global supplier of consumable materials primarily to semiconductor manufacturers. The company’s products play a critical role in the production of advanced semiconductor devices, helping to enable the manufacture of smaller, faster and more complex devices by its customers. CMC Materials, Inc. is also a leading provider of performance materials to pipeline operators. The company's mission is to create value by delivering high-performing and innovative solutions that solve its customers’ challenges. The company has approximately 2,200 employees globally. For more information about CMC Materials, Inc., visit www.cmcmaterials.com, or contact Colleen Mumford, Vice President, Communications and Marketing, at 630-499-2600.

Additional Information about the Acquisition and Where to Find It

This communication does not constitute an offer to buy or sell or the solicitation of an offer to buy or sell any securities or a solicitation of any vote or approval. This communication relates to a proposed business combination between Entegris and CMC. In connection with the proposed transaction Entegris filed with the Securities and Exchange Commission (the “SEC”) a registration statement on Form S-4 (the “Registration Statement”) that included a proxy statement of CMC and that also constitutes a prospectus of Entegris. Each of Entegris and CMC may also file other relevant documents with the SEC regarding the proposed transaction. This document is not a substitute for the proxy statement/prospectus or Registration Statement or any other document that Entegris or CMC may file with the SEC. The Registration Statement was declared effective by the SEC on January 28, 2022 and CMC commenced mailing of the definitive proxy statement/prospectus to its stockholders on or about January 28, 2022. INVESTORS AND SECURITY HOLDERS ARE URGED TO READ THE REGISTRATION STATEMENT, PROXY STATEMENT/PROSPECTUS AND OTHER DOCUMENTS THAT MAY BE FILED WITH THE SEC, AS WELL AS ANY AMENDMENTS OR SUPPLEMENTS TO THESE DOCUMENTS, CAREFULLY AND IN THEIR ENTIRETY BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION ABOUT THE PROPOSED TRANSACTION. Investors and security holders will be able to obtain free copies of these documents and other documents containing important information about Entegris and CMC, once such documents are filed with the SEC through the website maintained by the SEC at http://www.sec.gov. Copies of the documents filed with the SEC by Entegris are available free of charge on Entegris’ website at http://Entegris.com or by contacting Entegris’ Investor Relations Department by email at [e-mail] or by phone at [phone]. Copies of the documents filed with the SEC by CMC will be available free of charge on CMC’s website at www.CMCmaterials.com/investors or by contacting CMC’s Investor Relations Department by email at [e-mail] by phone at [phone].