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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
1228680	A Ted Gardner	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	2016-04-19	50,000	$0.00	50,000	No	4	C	Indirect	See Footnote
Class A Common Stock	Disposition	2016-04-19	50,000	$20.00	0	No	4	S	Indirect	See Footnote
Class A Common Stock	Acquisiton	2016-04-19	522,804	$0.00	522,804	No	4	C	Indirect	See Footnote
Class A Common Stock	Disposition	2016-04-19	522,804	$20.00	0	No	4	S	Indirect	See Footnote

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	C	Indirect	See Footnote
No	4	S	Indirect	See Footnote
No	4	C	Indirect	See Footnote
No	4	S	Indirect	See Footnote

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	2016-04-19	50,000	$0.00	50,000	$0.00
Class A Common Stock	LP Units of Summit Materials Holdings L.P.	Disposition	2016-04-19	522,804	$0.00	522,804	$0.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
202,752			No	4	C	Indirect
1,611,022			No	4	C	Indirect

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 ("Class A Common Stock") on a one-for-one basis.
Reflects securities held by a limited liability company controlled by Mr. Gardner.
This amount represents the $20.15 public offering price per share of Class A Common Stock, less the underwriting discount of $0.15 per share.
Reflects securities held by certain investment funds affiliated with Silverhawk Summit, L.P. ("Silverhawk"). Mr. Gardner, a managing partner and co-founder of Silverhawk, may be deemed to have beneficial ownership of the securities of the issuer held by Silverhawk.