Christopher Burke Gaskill

Date	Company	Security	Transaction	Code	Indirect	10b5-1	$Price	#Shares	$Value	#Remaining
10 Feb 25	SUM Summit Materials	Class A Common Stock	Sale back to company	Dispose D	No	No	52.5	44,693	2.35 mm	0
10 Feb 25	SUM Summit Materials	Performance Stock Units Class A Common Stock	Sale back to company	Dispose D	No	No	0	13,589	0.00	0
10 Feb 25	SUM Summit Materials	Performance Stock Units Class A Common Stock	Sale back to company	Dispose D	No	No	0	8,562	0.00	0
10 Feb 25	SUM Summit Materials	RSU Class A Common Stock	Sale back to company	Dispose D	No	No	0	15,289	0.00	0
10 Feb 25	SUM Summit Materials	RSU Class A Common Stock	Sale back to company	Dispose D	No	No	0	13,589	0.00	0
10 Feb 25	SUM Summit Materials	RSU Class A Common Stock	Sale back to company	Dispose D	No	No	0	5,708	0.00	0
10 Feb 25	SUM Summit Materials	RSU Class A Common Stock	Sale back to company	Dispose D	No	No	0	2,696	0.00	0
16 Jan 25	SUM Summit Materials	Class A Common Stock	Payment of exercise	Dispose F	No	No	52.19	3,850	200.93 k	44,693
16 Jan 25	SUM Summit Materials	Class A Common Stock	Grant	Acquire A	No	No	0	8,491	0.00	48,543
15 Jan 25	SUM Summit Materials	RSU Class A Common Stock	Grant	Acquire A	No	No	0	15,289	0.00	15,289

Data from 3, 4 and 5 filings. Values as filed, not updated for current price.