BlackRock Investment Management’s Summit Materials, Inc. Class A Common Stock SUM Stock Holding History

BlackRock Investment Management’s Portfolio SUM Stock Details SUM Fund Activity

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Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2016 Q4	$6.82M	Sell
2016 Q3	$5.32M	Buy
2016 Q2	$4.83M	Buy
2016 Q1	$2.17M	Buy
2015 Q4	$2.09M	Buy
2015 Q3	$1.63M	Buy
2015 Q2	$2.21M	Buy