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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1621563	Summit Materials Inc.	SUM	()	4

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1220679	L Howard Lance	C/O Summit Materials, Inc. 1550 Wynkoop Street, 3Rd Floor Denver CO 80202		Yes	No	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Class A Common Stock	Acquisiton	2016-04-05	75,000	$0.00	75,000	No	4	C	Direct
Class A Common Stock	Disposition	2016-04-06	75,000	$19.79	0	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	C	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Class A Common Stock	LP Units of Summit Materials Holdings L.P.	Disposition	2016-04-05	75,000	$0.00	75,000	$0.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
178,499			No	4	C	Direct

Footnotes

Pursuant to the terms of an exchange agreement, dated as of March 11, 2015, the limited partnership units of Summit Materials Holdings L.P. ("LP Units") reported herein are exchangeable from and after the first anniversary of the closing of the issuer's initial public offering (subject to the terms of the exchange agreement and vesting requirements, including certain vesting events more fully described in the issuer's Registration Statement on Form S-1 (File No. 333-201058)) for shares of the issuer's Class A common stock on a one-for-one basis.
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $19.50 to $20.01, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth above.