Item 7.01 Regulation FD Disclosure.

On August 12, 2021, CMC Materials, Inc. (the "Company") updated its "Third Quarter of Fiscal 2021 Earnings Slides & Remarks" presentation furnished on its investor relations website to include additional financial information in the Appendix. The presentation is available at cmcmaterials.com in the Quarterly Results section of the Investor Relations center. The Company assumes no obligation to update such information in the future.

The information contained in the presentation and incorporated herein by reference is being furnished pursuant to Item 7.01 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.

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