Christopher B. Gaskill - Mar 1, 2022 Form 4 Insider Report for Summit Materials, Inc. (SUM)

Role: Title: EVP, Chief Legal Officer & Secretary
Signature: /s/ Christopher B. Gaskill
Stock symbol: SUM
Transactions as of: Mar 1, 2022
Transactions value $: $0
Form type: 4
Date filed: 3/3/2022, 03:17 PM
Previous filing: Mar 1, 2022
Next filing: May 26, 2022

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	+8.09K		$0.00	8.09K	Mar 1, 2022	Class A Common Stock	8.09K		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, 2023.

Remarks:

Title: EVP, Chief Legal Officer & Secretary