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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1621563	Summit Materials Inc.	SUM	Mining & Quarrying Of Nonmetallic Minerals (No Fuels) (1400)	471984212

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1635271	James Brian Harris	C/O Summit Materials, Inc. 1550 Wynkoop Street, 3Rd Floor Denver CO 80202	Evp & Chief Financial Officer	No	Yes	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	2015-03-17	55,000	$18.00	55,000	No	4	P	Direct

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

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Class A Common Stock	Options (right to buy)	Acquisiton	2015-03-11	101,200	$0.00	101,200	$18.00
Class A Common Stock	Options (right to buy)	Acquisiton	2015-03-11	131,560	$0.00	131,560	$18.00
Class A Common Stock	LP Units of Summit Materials Holdings L.P.	Acquisiton	2015-03-11	648,621	$0.00	648,621	$0.00

Remaning Holdings	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
101,200	2025-03-11	No	4	A	Direct
131,560	2025-03-11	No	4	A	Direct
648,621		No	4	A	Indirect

Footnotes

The options vest in four equal annual installments beginning on March 11, 2016.
These securities were acquired in connection with the reclassification of the interests of Summit Material Holdings L.P. prior to the issuer's initial public offering (as more fully described in the issuer's Registration Statement on Form S-1 (File No. 333-201058) (the "Registration Statement").
The options vest upon the achievement of certain vesting events more fully described in the Registration Statement.
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 Registration Statement for shares of the issuer's Class A common stock on a one-for-one basis.
Reflects securities held by a trust for the benefit of Mr. Harris' family, for which Mr. Harris' spouse serves as trustee.