Christopher Burke Gaskill - 22 Feb 2023 Form 4 Insider Report for Summit Materials, Inc.

Role: Title: EVP, Chief Legal Officer & Secretary
Signature: /s/ Christopher B. Gaskill
Issuer symbol: N/A
Transactions as of: 22 Feb 2023
Net transactions value: $0
Form type: 4
Filing time: 24 Feb 2023, 17:06:22 UTC
Previous filing: 01 Aug 2022
Next filing: 01 Mar 2023
SEC: View on sec.gov

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	SUM	Restricted Stock Units	Award	$0	+8,562		$0.000000	8,562	22 Feb 2023	Class A Common Stock	8,562		Direct	F1, F2

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

Explanation of Responses:

Id	Content
F1	Each restricted stock unit represents a contingent right to receive one share of Class A common stock of the Issuer ("Class A Common Stock"). The restricted stock units will be settled in either Class A Common Stock or cash (or a combination thereof) at the discretion of the Issuer's Human Capital and Compensation Committee.
F2	These restricted stock units vest in three equal annual installments beginning on February 28, 2024.

Remarks:

Title: EVP, Chief Legal Officer & Secretary