Item 2.02 Triggering Events that Accelerate or Increase a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement.

On September 7, 2021, Summit Materials, LLC ("Summit LLC") and Summit Materials Finance Corp. (together with Summit LLC, the "Issuers"), indirect subsidiaries of Summit Materials, Inc., instructed Wilmington Trust, National Association, as trustee (the "Trustee") for the Issuers' 5.125% Senior Notes due 2025 (the "Notes"), to deliver a notice of redemption to the holders of the Notes ("Redemption Notice"). Pursuant to the Redemption Notice, the Company will redeem in full the outstanding Notes in the aggregate principal amount of $300,000,000 that were issued under an indenture dated as of June 1, 2017, by and among the Issuers, the subsidiary guarantors named on the signature pages thereto and the Trustee (as amended and supplemented, the "Indenture"). The redemption date will be September 27, 2021 (the "Redemption Date") and the redemption price will be equal to 101.281% of the aggregate principal amount thereof plus accrued and unpaid interest, if any, thereon to, but excluding, the Redemption Date. Upon the redemption by the Issuers' of the Notes, the Indenture will be discharged and cease to be of further effect except as to rights thereunder. The Notes are expected to be redeemed with cash on hand.

This Current Report on Form 8-K does not constitute a notice of redemption for the Notes or an offer to tender for, or purchase, any Notes or any other security.

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