Summit Materials, Inc.

Ownership Transactions Reported by 25 Insiders

	Insiders	Shares	%	Avg Price	Total $
Buys	0
Sells	1	-50.6K	100%	$40.21	-$2.03M
Net	-1	-50.6K	-100%		-$2.03M

Name	Relationship	Holdings Value	Past Year Net Change	Change %	Report Date
Grupo Argos S.A.	Director, 10%+ Owner	$1.75B			Jan 12, 2024
Argos SEM, LLC	Director, 10%+ Owner	$1.75B			Jan 12, 2024
Anne P. Noonan	President & CEO, Director	$14M			Mar 7, 2024
Brian James Harris	EVP & Chief Financial Officer	$7.36M			Feb 28, 2023
Jason Kilgore	Title: EVP, West Segment Construction Materials	$7.36M	-$2.03M	-21.7%	May 13, 2024
Howard L. Lance	Director	$2.8M			Mar 7, 2024
Christopher B. Gaskill	Title: EVP, Chief Legal Officer & Secretary	$2.25M			Mar 7, 2024
Joseph S. Cantie	Director	$2.03M			Mar 7, 2024
Karli S. Anderson	Title: EVP, Chief People and ESG Officer and Head of Communications	$1.84M			Mar 7, 2024
Steven H. Wunning	Director	$1.81M			Mar 7, 2024
Craig Scott Anderson	EVP & Chief Financial Officer	$1.61M			Mar 7, 2024
David Loomes	Officer	$1.32M			Mar 7, 2024
Kekin Ghelani	Chief Strategy&Growth Officer	$1.29M			Mar 7, 2024
Anne K. Wade	Director	$1.29M			Mar 7, 2024
Charles DePriest	Title: EVP, East Segment Construction Materials	$918K			Mar 7, 2024
John R. Murphy	Director	$688K			Sep 29, 2023
Tamla Oates-Forney	Director	$653K			Mar 7, 2024
Brian D. Frantz	Officer	$554K			Mar 7, 2024
Deon MacMillan	EVP, Chief People Officer and Head of Corporate Communications	$414K			Mar 10, 2022
Marshall D. Moore	Title: EVP, Chief Operations Officer	$347K			Mar 7, 2024
Anne M. Cooney	Director	$142K			Mar 7, 2024
Susan A. Ellerbusch	Director	$142K			Mar 7, 2024
Juan Esteban Calle	Director	$142K			Mar 7, 2024
Irene Moshouris	Director	$142K			Mar 7, 2024
Jorge Mario Velasquez	Director	$142K			Mar 7, 2024

Insider	Symbol	Class	Transaction	%	Value $	* Price $	Shares	Shares Owned	Date	Ownership

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