Wellington Management Group’s Summit Materials, Inc. Class A Common Stock SUM Stock Holding History

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2020 Q4	–	Sell	-49,252	Closed	-$801K	–	2032
2020 Q3	$801K	Buy	+49,252	New	+$789K	﹤0.01%	1603
2019 Q3	–	Sell	-1,631,731	Closed	-$30.9M	–	2132
2019 Q2	$30.9M	Sell	1,631,731 -230,775	-12%	-$3.67M	0.01%	903
2019 Q1	$29.1M	Sell	1,862,506 -41,874	-2%	-$655K	0.01%	905
2018 Q4	$23.2M	Buy	1,904,380 +256,748	+16%	+$3.55M	0.01%	947
2018 Q3	$29.5M	Sell	1,647,632 -1,248,648	-43%	-$27.2M	0.01%	961
2018 Q2	$74.8M	Buy	2,896,280 +401,410	+16%	+$11.2M	0.02%	671
2018 Q1	$74.3M	Buy	2,494,870 +1,068,088	+75%	+$32.9M	0.02%	663
2017 Q4	$44.1M	Sell	1,426,782 -16,492	-1%	-$496K	0.01%	806
2017 Q3	$44.8M	Buy	1,443,274 +96,157	+7%	+$2.73M	0.01%	789
2017 Q2	$37.7M	Buy	1,347,117 +781,438	+138%	+$20.3M	0.01%	816
2017 Q1	$13.6M	Buy	+565,679	New	+$13.3M	﹤0.01%	1153
2016 Q4	–	Sell	-770,583	Closed	-$13.7M	–	2289
2016 Q3	$13.7M	Sell	770,583 -20,892	-3%	-$404K	﹤0.01%	1085
2016 Q2	$15.5M	Sell	791,475 -211,423	-21%	-$4.22M	﹤0.01%	1031
2016 Q1	$18.7M	Buy	1,002,898 +60,521	+6%	+$990K	﹤0.01%	948
2015 Q4	$18.1M	Buy	942,377 +97,273	+12%	+$1.98M	﹤0.01%	991
2015 Q3	$15M	Buy	845,104 +36,767	+5%	+$847K	﹤0.01%	1054
2015 Q2	$19.5M	Buy	808,337 +35,535	+5%	+$844K	0.01%	1032
2015 Q1	$16.2M	Buy	+772,802	New	+$15.7M	﹤0.01%	1104