Summit Materials Inc. (SUM)

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Institutional Investors' Holdings

Filing Period:

No.	Name	Shares	Value	% Port
1.	Vanguard Group Inc	11,978,367	$460,687,994	0.01%
2.	Blackrock Inc.	11,365,151	$437,103,709	0.01%
3.	Massachusetts Financial Services Co	6,650,459	$255,776,654	0.08%
4.	Dimensional Fund Advisors Lp	5,458,814	$209,948,519	0.06%
5.	Principal Financial Group Inc	5,259,949	$202,297,643	0.12%