Summit Materials, Inc. (NYSE:SUM, "Summit" or the "Company"))), a leading vertically integrated construction materials company, today announced that it will release third quarter 2021 financial results after the market closes on Wednesday, November 3, 2021. A conference call will be held on Thursday, November 4, 2021 at 11:00 a.m. eastern time (9:00 a.m. mountain time) to review Summit's financial results, discuss recent events and conduct a question-and-answer session.

A webcast of the third quarter 2021 results conference call and accompanying presentation materials will be available in the Investors section of Summit's website at investors.summit-materials.com or at the following link:

https://event.on24.com/wcc/r/3257022/BE43B9CA1A99E25D8C39723CE6D11D65

To participate in the live teleconference for third quarter 2021 financial results:

Domestic Live:		1-877-823-8690
International Live:		1-825-312-2236
Conference ID:		3128039
Password:		Summit

To listen to a replay of the teleconference, which will be available through November 11, 2021:

Domestic Replay:		1-800-585-8367
International Replay:		1-416-621-4642
Conference ID:		3128039

About Summit Materials, Inc.

Summit Materials is a leading vertically integrated materials-based company that supplies aggregates, cement, ready-mix concrete and asphalt in the United States and British Columbia, Canada. Summit is a geographically diverse, materials-based business of scale that offers customers a single-source provider of construction materials and related downstream products in the public infrastructure, residential and non-residential end markets. Summit has a strong track record of successful acquisitions since its founding and continues to pursue growth opportunities in new and existing markets. For more information about Summit Materials, please visit www.summit-materials.com.

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Summit Materials Announces Third Quarter 2021 Results Conference Call Date