Type	Name	Date
Credit agreement	Amendment No. 2, to the Amended and Restated Credit Agreement, 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	11/21/2017
Credit agreement	Amendment No. 1, to the Amended and Restated Credit Agreement, 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	01/19/2017
Indenture	Indenture, by and among Summit Materials, LLC, Summit Materials Finance Corp., the subsidiary guarantors named on the signature pages thereto and Wilmington Trust, National Association, as trustee	03/08/2016
Indenture	Indenture, by and among Summit Materials, LLC, Summit Materials Finance Corp., the subsidiary guarantors named on the signature pages thereto and Wilmington Trust, National Association, as trustee	07/08/2015
Registration rights agreement	Registration Rights Agreement, by and among Summit Materials, Inc. and the holders from time to time party thereto	03/17/2015
Credit agreement	Amendment No. 3, to the Credit Agreement, by and among Summit Materials, LLC, the guarantors party thereto, Bank of America, N.A., as administrative agent, collateral agent, L/C issuer and swing line lender and the other parties thereto	03/17/2015

Type	Name	Date
By-Laws	Amended and Restated Bylaws of Summit Materials, Inc	03/17/2015

Type	Name	Date
Other	Offer Letter, between Summit Materials Holdings L.P. and Karl Watson	01/04/2018