Contacts

General investor inquiries:

CMC Materials Corporation
Investor Relations
870 N. Commons Drive
Aurora IL 60504
630-499-2600
investors@cmcmaterials.com

Vice President, Communications and Marketing:

Colleen Mumford

Investor Relations Manager:

Eugene Fedotoff

Stock transfer agent and registrar inquiries:

781-575-3400

Mailing addresses

Shareholder correspondence should be mailed to:
Computershare
P.O. BOX 30170
College Station, TX 77842-3170

Overnight correspondence should be sent to:
Computershare
211 Quality Circle, Suite 210
College Station, TX 77845

Shareholder website

www.computershare.com/investor

Shareholder online inquiries

https://www-us.computershare.com/investor/Contact