DENVER--(BUSINESS WIRE)--Summit Materials, Inc. (NYSE: SUM, “Summit” or the “Company”) announced today the launch of an offering of 17,500,000 shares of its Class A common stock. Summit expects to grant the underwriters a 30-day option to purchase up to an additional 2,625,000 shares of Class A common stock. Summit intends to use all of the net proceeds from the offering to purchase for cash 3,750,000 newly-issued limited partnership units, or LP Units, from Summit Materials Holdings L.P. (“Sum


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