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Event: Summit Materials, Inc. 2016 Annual Meeting of Stockholders
Date: Thursday, May 26, 2016
Time: 8:00 AM Eastern Time
Address: 425 Lexington Avenue, New York, NY 10017

Additional Information:

The Summit Materials, Inc. 2016 Annual Meeting of Stockholders (the “Annual Meeting”) will be held at the offices of Simpson Thacher & Bartlett LLP, located in the middle of the block on the Eastern side of Lexington Avenue between 44th and 43rd Avenues in New York City. To gain admission to the Annual Meeting, you will need to show that you are a stockholder of Summit Materials, Inc. All stockholders will be required to show valid, government-issued, picture identification. If your shares are registered in your name, your name will be compared to the list of registered stockholders to verify your share ownership. If your shares are in the name of your broker or bank, you will need to bring evidence of your share ownership, such as your most recent brokerage account statement or a legal proxy from your broker. If you do not have valid picture identification and proof that you own stock, you will not be admitted to the Annual Meeting. All packages and bags are subject to inspection. Please note that the registration desk will open at 7:30 a.m. Please arrive in advance of the start of the meeting to allow time for identity verification.