Anne P. Noonan - 20 Jul 2022 Form 4 Insider Report for Summit Materials, Inc.

Role: President & CEO, Director
Signature: /s/ Christopher B. Gaskill, as Attorney-in-Fact
Issuer symbol: N/A
Transactions as of: 20 Jul 2022
Net transactions value: -$236,267
Form type: 4
Filing time: 20 Jul 2022, 19:01:53 UTC
Previous filing: 12 May 2022
Next filing: 29 Aug 2022
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		+21,289	+23%		115,500	20 Jul 2022	Direct	F1, F2
transaction	SUM	Class A Common Stock	Tax liability	$236,267	-9,346	-8.1%	$25.28	106,154	20 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	-21,289	-50%	$0.000000	21,288	20 Jul 2022	Class A Common Stock	21,289		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 1,014 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 63,866 restricted stock units that vest in three equal installments beginning on July 20, 2021.