Craig Scott Anderson - 07 Mar 2024 Form 4 Insider Report for Summit Materials, Inc.

Role: EVP & Chief Financial Officer
Signature: /s/ David Hamm, as Attorney-in-Fact
Issuer symbol: N/A
Transactions as of: 07 Mar 2024
Net transactions value: -$142,218
Form type: 4
Filing time: 08 Mar 2024, 20:24:22 UTC
Previous filing: 04 Mar 2024
Next filing: 26 Dec 2024
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	Award	$0	+11,667	+92%	$0.000000	24,291	07 Mar 2024	Direct	F1, F2
transaction	SUM	Class A Common Stock	Tax liability	$142,218	-3,355	-14%	$42.39	20,936	07 Mar 2024	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	Award	$0	+17,122		$0.000000	17,122	07 Mar 2024	Class A Common Stock	17,122		Direct	F3, F4

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

Explanation of Responses:

Id	Content
F1	Reflects shares of Class A Common Stock earned and delivered on performance units previously granted based upon the satisfaction of certain performance criteria.
F2	Total holdings include shares of Class A Common Stock acquired through the Issuer's Employee Stock Purchase Plan on May 28, 2023 and November 30, 2023.
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	These restricted stock units vest in three equal annual installments beginning on February 28, 2025.