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Summit Materials Prices Secondary Offering of Common Stock

SUM | July 13, 2016

Summit Materials Prices Secondary Offering of Common Stock

Summit Materials, Inc. (NYSE: SUM, “Summit”) announced today the pricing of a secondary offering of 12.5 million shares of Class A common stock by certain selling stockholders, including affiliates of The Blackstone Group L.P., at a public offering price of $20.75 per share. The offering is expected to close on July 19, 2016, subject to customary closing conditions.

Summit did not offer any shares of Class A common stock in the offering and will not receive any proceeds from the sale of shares in this offering.

Barclays is serving as sole book-running manager for the offering.

The offering of these securities is being made pursuant to an effective shelf registration statement. The offering will be made only by means of a prospectus. A copy of the prospectus relating to these securities may be obtained, when available, from: Barclays Capital Inc., c/o Broadridge Financial Solutions, 1155 Long Island Avenue, Edgewood, NY 11717, by telephone at: (888) 603-5847 or by email at: Barclaysprospectus@broadridge.com.

This press release shall not constitute an offer to sell or the solicitation of an offer to buy, nor shall there be any sale of these securities in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.

About Summit Materials

Summit Materials is a leading vertically integrated materials-based company that supplies aggregates, cement, ready-mixed 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 nonresidential end markets. Summit has completed more than 40 acquisitions since its founding and continues to pursue growth opportunities in new and existing markets.

Forward-Looking Statements and Information:

This press release contains “forward-looking statements” within the meaning of the federal securities laws, which involve risks and uncertainties. Forward-looking statements include all statements that do not relate solely to historical or current facts, and you can identify forward-looking statements because they contain words such as “believes,” “expects,” “may,” “will,” “should,” “seeks,” “intends,” “trends,” “plans,” “estimates,” “projects” or “anticipates” or similar expressions that concern our strategy, plans, expectations or intentions. Any and all statements made relating to the macroeconomic outlook for our markets, potential acquisition activity, our estimated and projected earnings, margins, costs, expenditures, cash flows, sales volumes and financial results are forward-looking statements. These forward-looking statements are subject to risks and uncertainties that may change at any time, and, therefore, our actual results may differ materially from those expected. We derive many of our forward-looking statements from our operating budgets and forecasts, which are based upon many detailed assumptions. While we believe that our assumptions are reasonable, it is very difficult to predict the impact of known factors, and, of course, it is impossible to anticipate all factors that could affect our actual results.

In light of the significant uncertainties inherent in the forward-looking statements included herein, the inclusion of such information should not be regarded as a representation by us or any other person that the results or conditions described in such statements or our objectives and plans will be achieved. Important factors could affect our results and could cause results to differ materially from those expressed in our forward-looking statements, including but not limited to the factors discussed in the section entitled “Risk Factors” in our annual report on Form 10-K for the fiscal year ended January 2, 2016. Such factors may be updated from time to time in our periodic filings with the SEC, which are accessible on the SEC’s website at www.sec.gov.

We undertake no obligation to publicly update or revise any forward-looking statement as a result of new information, future events or otherwise, except as otherwise required by law.