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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	2017-05-04	57,555	$18.00	57,555	No	4	M	Indirect	See Footnote
Class A Common Stock	Disposition	2017-05-04	36,211	$28.61	21,344	No	4	F	Indirect	See Footnote
Class A Common Stock	Disposition	2017-05-05	21,344	$28.04	0	No	4	S	Indirect	See Footnote

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Indirect	See Footnote
No	4	F	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	Warrants	Disposition	2017-05-04	57,555	$0.00	57,555	$18.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0		2025-03-11	No	4	M	Indirect

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Class A Common Stock	6,414	Direct

Reported Derivative Holdings

Sec. Name	Sec. Type	Price	Date	Expiration Date	Amount	Remaning Holdings	Nature of Ownership
Class A Common Stock	Warrants	$18.00		2025-03-11	27,408	27,408	Indirect

Expiration Date	Amount	Remaning Holdings	Nature of Ownership
2025-03-11	27,408	27,408	Indirect

Footnotes

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.
On May 4, 2017, the Reporting Person exercised warrants to purchase 57,555 shares of Class A Common Stock for $18.00 per share. The Reporting Person paid the exercise price on a cashless basis, resulting in the Issuer withholding 36,211 of the warrant shares to pay the exercise price and issuing to the Reporting Person the remaining 21,344 shares.
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $28.03 to $28.07, 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.
These warrants are fully exercisable.
Reflects securities held by a limited liability company controlled by Mr. Gardner.