A.R.T. Advisors’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 Q1	–	Sell	-129,632	Closed	-$3.05M	–	1055
2019 Q4	$3.05M	Buy	129,632 +95,191	+276%	+$2.16M	0.15%	171
2019 Q3	$752K	Buy	+34,441	New	+$680K	0.04%	683
2019 Q1	–	Sell	-78,659	Closed	-$959K	–	1680
2018 Q4	$959K	Buy	+78,659	New	+$1.09M	0.06%	457
2018 Q2	–	Sell	-64,310	Closed	-$1.91M	–	1812
2018 Q1	$1.91M	Sell	64,310 -7,831	-11%	-$242K	0.08%	399
2017 Q4	$2.23M	Buy	72,141 +21,423	+42%	+$645K	0.1%	334
2017 Q3	$1.57M	Buy	50,718 +10,415	+26%	+$296K	0.08%	355
2017 Q2	$1.13M	Buy	+40,303	New	+$1.05M	0.06%	470
2017 Q1	–	Sell	-90,318	Closed	-$2.08M	–	1762
2016 Q4	$2.08M	Buy	+90,318	New	+$1.89M	0.12%	252
2016 Q3	–	Sell	-17,237	Closed	-$337K	–	1219
2016 Q2	$337K	Sell	17,237 -31,935	-65%	-$638K	0.02%	934
2016 Q1	$916K	Buy	+49,172	New	+$804K	0.04%	623
2015 Q4	–	Sell	-102,850	Closed	-$1.82M	–	1765
2015 Q3	$1.82M	Buy	+102,850	New	+$2.37M	0.07%	407