Anne P. Noonan - 28 Feb 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: 28 Feb 2022
Net transactions value: -$152,510
Form type: 4
Filing time: 01 Mar 2022, 16:52:27 UTC
Previous filing: 22 Jul 2021
Next filing: 03 Mar 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		+16,946	+21%		98,082	28 Feb 2022	Direct	F1
transaction	SUM	Class A Common Stock	Tax liability	$152,510	-4,885	-5%	$31.22	93,197	28 Feb 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	-16,946	-33%	$0.000000	33,892	28 Feb 2022	Class A Common Stock	16,946		Direct	F2, F3

* 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	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.
F3	The Reporting Person was granted 50,838 restricted stock units that vest in three equal annual installments beginning on February 28, 2022.