Summit Materials Inc. (SUM)

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Institutional Investors' Holdings

Filing Period:

No.	Name	Shares	Value	% Port
1.	Vanguard Group Inc	12,373,001	$626,073,851	0.01%
2.	Blackrock, Inc.	9,993,637	$505,678,032	0.01%
3.	Macquarie Group Ltd	3,150,287	$159,416,000	0.19%
4.	Dimensional Fund Advisors Lp	3,147,009	$159,240,262	0.03%
5.	Henderson Group Plc	3,096,383	$156,681,837	0.07%