Westfield Capital Management’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
2019 Q4	–	Sell	-1,880,249	Closed	-$41M	–	255
2019 Q3	$41M	Sell	1,880,249 -629,716	-25%	-$12.4M	0.33%	103
2019 Q2	$47.5M	Sell	2,509,965 -362,987	-13%	-$5.77M	0.36%	100
2019 Q1	$44.8M	Buy	2,872,952 +182,409	+7%	+$2.85M	0.34%	96
2018 Q4	$32.8M	Buy	2,690,543 +315,586	+13%	+$4.36M	0.28%	115
2018 Q3	$42.5M	Sell	2,374,957 -72,412	-3%	-$1.57M	0.3%	112
2018 Q2	$63.2M	Sell	2,447,369 -562,249	-19%	-$15.7M	0.47%	71
2018 Q1	$89.6M	Sell	3,009,618 -301,901	-9%	-$9.31M	0.69%	47
2017 Q4	$102M	Sell	3,311,519 -137,362	-4%	-$4.13M	0.78%	31
2017 Q3	$107M	Buy	3,448,881 +366,009	+12%	+$10.4M	0.82%	27
2017 Q2	$86.3M	Buy	3,082,872 +1,619,872	+111%	+$42.2M	0.74%	40
2017 Q1	$35.1M	Sell	1,463,000 -123,571	-8%	-$2.9M	0.3%	116
2016 Q4	$36.6M	Buy	1,586,571 +331,204	+26%	+$6.95M	0.32%	109
2016 Q3	$22.3M	Buy	1,255,367 +131,198	+12%	+$2.54M	0.18%	163
2016 Q2	$22M	Buy	+1,124,169	New	+$22.5M	0.18%	153