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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
2006214	Jason Kilgore	1801 California Street Suite 3500 Denver CO 80202	See Remarks	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
Class A Common Stock	Acquisiton	2024-05-13	50,589	$18.00	111,219	No	4	M	Direct
Class A Common Stock	Disposition	2024-05-13	11,210	$40.40	100,009	No	4	S	Direct
Class A Common Stock	Disposition	2024-05-13	39,379	$40.15	60,630	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	M	Direct
No	4	S	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	Options (right to buy)	Disposition	2024-05-13	50,589	$0.00	50,589	$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	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Class A Common Stock	108,642	Indirect	See Footnote

Footnotes

Total holdings include shares of Class A Common Stock received pursuant to a stock dividend paid on December 29, 2022.
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $40.34 to $40.45, 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. The Reporting Person remains within compliance of the Issuer's equity ownership guidelines.
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $40.01 to $40.29, 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. The Reporting Person remains within compliance of the Issuer's equity ownership guidelines.
Reflects securities held by a limited liability company for the benefit of Mr. Kilgore's family, for which Mr. Kilgore's spouse serves as manager.
These options are fully vested.