Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

Deon MacMillan, Executive Vice President, Chief People Officer and Head of Corporate Communications of Summit Materials, Inc. (the "Company"), will be leaving the Company effective November 14, 2022. Ms. MacMillan's departure constitutes a termination without "cause" under the Company's Executive Severance Plan.

Item 7.01 Regulation FD Disclosure.

Effective upon Ms. MacMillan's departure, Karli Anderson, Executive Vice President, Chief ESG Officer and Head of Investor Relations of the Company will assume leadership of the Company's human resources and communications functions. As of the time of this report, the Company has not entered into any compensation arrangements with Ms. Anderson in connection with the announcement described above.

The information included under Item 7.01 of report is being furnished and shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or otherwise subject to the liabilities of such section. The information in Item 7.01 of this Current Report on Form 8-K shall not be incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act, unless specifically incorporated by reference into any such filing.

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