Gaskill Christopher Burke

• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Earnings

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Abbreviations B: Buy, S: Sell, PP: Planned purchase, PS: Planned sale, O: Option / Other

Notification date	Transaction date	B/S Transaction type	Nb. shares Price Value	Number of shares	Price	Value	Details
2024-12-11	2024-12-10	Summit Materials Inc (SUM)	S Sale	1,536 -3.7% 50.91 USD 78,198	1,536 -3.7%	50.91	USD 78,198
2022-05-26	2022-05-26	Summit Materials Inc (SUM)	PS Planned sale	8,104 -32.9% 27.63 USD 223,914	8,104 -32.9%	27.63	USD 223,914