Broadridge Financial Solutions, Inc.is the registrar and transfer agent for Summit Materials, Inc.’s common stock. Broadridge is available to resolve problems related to unpaid dividends, lost, destroyed or stolen certificates. It also facilitates name and address changes. The toll-free phone number for Broadridge is (877) 830-4936 and the e-mail address is shareholder@broadridge.com. Please visit www.broadridge.com for more information.
Regular Mail Communication items should be sent to:
Broadridge Corporate Issuer Solutions
P.O. Box 1342
Brentwood, NY 11717