Karli S. Anderson - Feb 29, 2024 Form 4 Insider Report for Summit Materials, Inc. (SUM)

Role
Title: EVP, Chief People and ESG Officer and Head of Communications
Signature
/s/ Christopher B. Gaskill, as Attorney-in-Fact
Stock symbol
SUM
Transactions as of
Feb 29, 2024
Transactions value $
-$150,638
Form type
4
Date filed
3/4/2024, 06:19 PM
Previous filing
May 12, 2023
Next filing
Mar 8, 2024

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction SUM Class A Common Stock Options Exercise +2.37K +12.48% 21.4K Feb 29, 2024 Direct F1, F2, F3
transaction SUM Class A Common Stock Options Exercise +2.41K +11.28% 23.8K Feb 29, 2024 Direct F1
transaction SUM Class A Common Stock Options Exercise +3.07K +12.94% 26.8K Feb 29, 2024 Direct F1
transaction SUM Class A Common Stock Tax liability -$151K -3.53K -13.14% $42.71 23.3K Feb 29, 2024 Direct

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

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction SUM Restricted Stock Units Options Exercise $0 -2.37K -100% $0.00* 0 Feb 29, 2024 Class A Common Stock 2.37K Direct F4, F5
transaction SUM Restricted Stock Units Options Exercise $0 -2.41K -50% $0.00 2.41K Feb 29, 2024 Class A Common Stock 2.41K Direct F4, F6
transaction SUM Restricted Stock Units Options Exercise $0 -3.07K -33.33% $0.00 6.15K Feb 29, 2024 Class A Common Stock 3.07K Direct F4, F7
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Reflects restricted stock units that upon vesting converted into shares of Class A common stock of the Issuer ("Class A Common Stock") on a one-for-one basis.
F2 Total holdings include shares of Class A Common Stock received pursuant to a stock dividend paid on December 29, 2022.
F3 Total holdings include shares of Class A Common Stock acquired through the Issuer's Employee Stock Purchase Plan on April 14, 2022, October 18, 2022, May 28, 2023 and November 30, 2023.
F4 Each restricted stock unit represents a contingent right to receive one share of Class A common stock of the Issuer ("Class A Common Stock"). The restricted stock units will be settled in either Class A Common Stock or cash (or a combination thereof) at the discretion of the Issuer's Human Capital and Compensation Committee.
F5 These restricted stock units vested on February 29, 2024.
F6 These restricted stock units vest in three equal annual installments beginning on February 28, 2023.
F7 These restricted stock units vest in three equal annual installments beginning on February 29, 2024.

Remarks:

Title: EVP, Chief People and ESG Officer and Head of Communications