Joseph S. Cantie - 28 Feb 2022 Form 4 Insider Report for Summit Materials, Inc.

Role: Director
Signature: /s/ Christopher B. Gaskill, as Attorney-in-Fact
Issuer symbol: N/A
Transactions as of: 28 Feb 2022
Net transactions value: $0
Form type: 4
Filing time: 01 Mar 2022, 16:48:12 UTC
Previous filing: 06 Jan 2022
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		+4,374	+17%		30,663	28 Feb 2022	Direct	F1
holding	SUM	Class A Common Stock						5,100	28 Feb 2022	See Footnote	F2

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	-4,374	-100%	$0.000000^*	0	28 Feb 2022	Class A Common Stock	4,374		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	Reflects securities held by a trust for the benefit of the Reporting Person, for which the Reporting Person and his spouse serve as trustees.
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	On March 30, 2021, the Reporting Person was granted 4,374 restricted stock units that vested on February 28, 2022.