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

As previously disclosed by Summit Materials, Inc. (the "Company") on a Current Report on Form 8-K filed on November 14, 2022, Karli Anderson, formerly Executive Vice President, Chief ESG Officer and Head of Investor Relations of the Company has assumed leadership of the Company's human resources and communications functions. In connection with her expanded leadership role the Company's Board of Directors (the "Board") appointed Ms. Anderson Executive Vice President, Chief People and ESG Officer and Head of Communications and, as approved by the Human Capital and Compensation Committee of the Board, Ms. Anderson has entered into a new offer of employment that provides for an increase in base salary from $394,000 to $475,000 to reflect her increased responsibilities.

The foregoing description of Ms. Anderson's new offer of employment does not purport to be complete and is qualified in its entirety by reference to such offer letter, a copy of which is filed as Exhibit 10.1 to, and is incorporated by reference into, this Current Report on Form 8-K.

Item 7.01 Regulation FD Disclosure.

On November 16, 2022, the Company issued a press release announcing Ms. Anderson's expanded leadership role. A copy of the Company's press release is attached as Exhibit 99.1 to this report.

The information included under Item 7.01 of report, including Exhibit 99.1 attached hereto, 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, including Exhibit 99.1, 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.

Item 9.01 Financial Statements and Exhibits.



(d)  Exhibits

     Exhibit No.                                           Description

10.1                          Offer Letter between Summit Materials, Inc. and Karli Anderson  .

99.1                          Press Release of Summit Materials, Inc. dated November 16, 2022  .

                            Cover Page Interactive Data File (embedded within the Inline XBRL
104.1                       document)

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