Christopher Burke Gaskill - 06 Dec 2023 Form 4 Insider Report for Summit Materials, Inc.

Role: Title: Executive Vice President, Chief Legal Officer and Secretary
Signature: /s/ Christopher B. Gaskill
Issuer symbol: N/A
Transactions as of: 06 Dec 2023
Net transactions value: $0
Form type: 4
Filing time: 06 Dec 2023, 19:14:19 UTC
Previous filing: 01 Mar 2023
Next filing: 04 Mar 2024
SEC: View on sec.gov

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	SUM	Class A Common Stock	Gift	$0	-154	-0.58%	$0.000000	26,452	06 Dec 2023	Direct	F1, F2
transaction	SUM	Class A Common Stock	Gift	$0	-28	-0.11%	$0.000000	26,424	06 Dec 2023	Direct
transaction	SUM	Class A Common Stock	Gift	$0	-14	-0.05%	$0.000000	26,410	06 Dec 2023	Direct
transaction	SUM	Class A Common Stock	Gift	$0	-28	-0.11%	$0.000000	26,382	06 Dec 2023	Direct

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Total holdings include shares of Class A Common Stock received pursuant to a stock dividend paid on December 29, 2022.
F2	Total holdings include shares of Class A Common Stock acquired through the Issuer's Employee Stock Purchase Plan on April 14, 2022, October 18, 2022, May 28, 2023 and November 20, 2023.

Remarks:

Title: Executive Vice President, Chief Legal Officer and Secretary