Summit Materials, Inc. (SUM) Files An 8-K Other Events

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Summit Materials, Inc. (SUM) Files An 8-K Other Events

Item 8.01. Other Events.

On November16, 2016, certain selling stockholders (the Selling
Stockholders) of Summit Materials,Inc. (the Company) completed an
underwritten public offering of 16,614,949 shares (the Shares) of
ClassA common stock, par value $0.01 per share, of the Company at
a public offering price of $22.10 per share to an underwriting
agreement, dated November9, 2016 (the Underwriting Agreement),
among the Company, Summit Materials Holdings L.P., the Selling
Stockholders named in Schedule IV thereto and Barclays Capital
Inc. The Company did not receive any proceeds from the sale of
the Shares by the Selling Stockholders.

A copy of the Underwriting Agreement is filed as Exhibit99.1
hereto and is incorporated herein by reference.

Item 9.01. Financial Statements and
Exhibits.

(d)Exhibits.

99.1

Underwriting Agreement, dated November9, 2016, among Summit
Materials,Inc., Summit Materials Holdings L.P., the selling
stockholders named in Schedule IV thereto and Barclays
Capital Inc.



About Summit Materials, Inc. (SUM)