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

Role
Title: EVP, Chief People and ESG Officer and Head of Communications
Signature
/s/ Christopher B. Gaskill, as Attorney-in-Fact
Issuer symbol
N/A
Transactions as of
29 Feb 2024
Net transactions value
-$150,638
Form type
4
Filing time
04 Mar 2024, 18:19:40 UTC
Previous filing
12 May 2023
Next filing
08 Mar 2024
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 Options Exercise +2,369 +12% 21,355 29 Feb 2024 Direct F1, F2, F3
transaction SUM Class A Common Stock Options Exercise +2,409 +11% 23,764 29 Feb 2024 Direct F1
transaction SUM Class A Common Stock Options Exercise +3,074 +13% 26,838 29 Feb 2024 Direct F1
transaction SUM Class A Common Stock Tax liability $150,638 -3,527 -13% $42.71 23,311 29 Feb 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 -2,369 -100% $0.000000* 0 29 Feb 2024 Class A Common Stock 2,369 Direct F4, F5
transaction SUM Restricted Stock Units Options Exercise $0 -2,409 -50% $0.000000 2,409 29 Feb 2024 Class A Common Stock 2,409 Direct F4, F6
transaction SUM Restricted Stock Units Options Exercise $0 -3,074 -33% $0.000000 6,148 29 Feb 2024 Class A Common Stock 3,074 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