David Loomes - 10 Feb 2025 Form 4 Insider Report for Summit Materials, Inc. (SUM)

Role: EVP, Cement
Signature: /s/ Christopher B. Gaskill, as Attorney-in-Fact
Issuer symbol: SUM
Transactions as of: 10 Feb 2025
Net transactions value: -$1,767,885
Form type: 4
Filing time: 10 Feb 2025, 17:44:07 UTC
Previous filing: 17 Jan 2025
SEC: View on sec.gov

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	SUM	Class A Common Stock	Disposed to Issuer	$1,767,885	-33,674	-100%	$52.50	0	10 Feb 2025	Direct	F1

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Shares	Change %	Date	Underlying Class	Amount	Ownership	Footnotes
transaction	SUM	Restricted Stock Units	Disposed to Issuer	-15,895	-100%	10 Feb 2025	Class A Common Stock	15,895	Direct	F1
transaction	SUM	Performance Stock Units	Disposed to Issuer	-7,766	-100%	10 Feb 2025	Class A Common Stock	7,766	Direct	F1
transaction	SUM	Performance Stock Units	Disposed to Issuer	-13,974	-100%	10 Feb 2025	Class A Common Stock	13,974	Direct	F1

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

David Loomes is no longer subject to Section 16 filing requirements. Form 4 or Form 5 obligations may continue.

Explanation of Responses:

Id	Content
F1	At or immediately prior to the effective time of the transactions contemplated by the Agreement and Plan of Merger, dated November 24, 2024, by and among Summit Materials, Inc., Quikrete Holdings, Inc., and Soar Subsidiary, Inc., (i) each share of Class A common stock of the issuer held by the reporting person was canceled, retired and converted into the right to receive $52.50 in cash (the "Merger Consideration"), (ii) the restricted stock units held by the reporting person were pro rata vested, canceled and converted into the right to receive the Merger Consideration and (iii) each performance stock unit award held by the reporting person was vested based on target performance, canceled and converted into the right to receive the Merger Consideration.

Content

At or immediately prior to the effective time of the transactions contemplated by the Agreement and Plan of Merger, dated November 24, 2024, by and among Summit Materials, Inc., Quikrete Holdings, Inc., and Soar Subsidiary, Inc., (i) each share of Class A common stock of the issuer held by the reporting person was canceled, retired and converted into the right to receive $52.50 in cash (the "Merger Consideration"), (ii) the restricted stock units held by the reporting person were pro rata vested, canceled and converted into the right to receive the Merger Consideration and (iii) each performance stock unit award held by the reporting person was vested based on target performance, canceled and converted into the right to receive the Merger Consideration.