Brian James Harris - 30 Jul 2022 Form 4 Insider Report for Summit Materials, Inc.

Role: EVP & Chief Financial Officer
Signature: /s/ Christopher B. Gaskill, as Attorney-in-Fact
Issuer symbol: N/A
Transactions as of: 30 Jul 2022
Net transactions value: -$160,961
Form type: 4
Filing time: 01 Aug 2022, 18:25:21 UTC
Previous filing: 03 Mar 2022
Next filing: 01 Mar 2023
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	Options Exercise		+13,328	+7.2%		197,819	30 Jul 2022	Direct	F1, F2
transaction	SUM	Class A Common Stock	Tax liability	$160,961	-5,851	-3%	$27.51	191,968	30 Jul 2022	Direct

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	Options Exercise	$0	-13,328	-100%	$0.000000^*	0	30 Jul 2022	Class A Common Stock	13,328		Direct	F3, F4

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

Explanation of Responses:

Id	Content
F1	Reflects restricted stock units that upon vesting converted into shares of Class A common stock of the Issuer ("Class A Common Stock") on a one-for-one basis.
F2	Includes 648 shares acquired through the Issuer's Employee Stock Purchase Plan on April 14, 2022.
F3	Each restricted stock unit represents a contingent right to receive one share of 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.
F4	The Reporting Person was granted 26,656 restricted stock units that vest in two equal installments beginning on July 30, 2021.