Item 1.01. Entry into a Material Definitive Agreement.

Amendment No. 6 to Amended and Restated Credit Agreement

On January 10, 2023, Summit Materials, LLC ("Summit LLC"), an indirect subsidiary of Summit Materials, Inc., and the guarantors party thereto entered into Amendment No. 6 ("Amendment No. 6") to the Amended and Restated Credit Agreement, dated as of July 17, 2015 (together with Amendment No. 1, dated as of January 19, 2017, Amendment No. 2, dated as of November 21, 2017, Amendment No. 3, dated as of May 22, 2018, Amendment No. 4, dated as of February 25, 2019 and Amendment No. 5, dated as of December 14, 2022, the "Credit Agreement"), governing Summit LLC's senior secured credit facilities, among Summit LLC, as borrower, the guarantors party thereto, the several banks and other financial institutions or entities party thereto, Bank of America, N.A., as administrative agent, collateral agent, L/C issuer and swing line lender and the other parties thereto.

Amendment No. 6 amended the Credit Agreement to, among other things, in respect of the revolving credit facility thereunder (the "Revolving Credit Facility"), (a) increase the total aggregate commitments under the Revolving Credit Facility from $345.0 million to $395.0 million, (b) convert the existing LIBOR-based rate applicable to the Revolving Credit Facility to a Term SOFR Rate with a SOFR adjustment of 0.10% per annum and a floor of zero and (c) extend the maturity date of the Revolving Credit Facility to January 10, 2028 (five years from the effective date of Amendment No. 6), provided that the maturity date will be December 14, 2026 if more than $125.0 million in aggregate principal amount of Summit LLC's senior unsecured notes due 2027 remain outstanding as of such date. All other material terms and provisions of the Revolving Credit Facility remain substantially the same as the terms and provisions in place immediately prior to the effectiveness of Amendment No. 6.

The foregoing description of Amendment No. 6 does not purport to be complete and is qualified in its entirety by reference to the full text of Amendment No. 6 which is filed herewith as Exhibit 10.1 and is incorporated herein by reference.

Item 2.03. Creation of a Direct Financial Obligation or an Obligation under an


           Off-Balance Sheet Arrangement of a Registrant.

The information set forth in Item 1.01 is incorporated by reference into this Item 2.03.

Item 9.01. Financial Statements and Exhibits.






(d) Exhibits.



  10.1     Amendment No. 6, dated as of January 10, 2023, to the Amended and
         Restated Credit Agreement, dated as of July 17, 2015 (as amended by
         Amendment No. 1, dated as of January 19, 2017, Amendment No. 2, dated as
         of November 21, 2017, Amendment No. 3, dated as of May 22, 2018, Amendment
         No. 4, dated as of February 25, 2019 and Amendment No. 5, dated as of
         December 14, 2022), among Summit Materials, LLC, as the borrower, the
         guarantors party thereto, the several banks and other financial
         institutions or entities from time to time party thereto, Bank of America,
         N.A., as administrative agent, collateral agent, L/C issuer and swing line
         lender and the other parties thereto.

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

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