Karli S. Anderson - Feb 28, 2023 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 28, 2023
Transactions value $
-$93,612
Form type
4
Date filed
3/1/2023, 04:42 PM
Previous filing
Feb 24, 2023
Next filing
May 12, 2023

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction SUM Class A Common Stock Options Exercise +2.2K +15.08% 16.8K Feb 28, 2023 Direct F1, F2, F3
transaction SUM Class A Common Stock Options Exercise +2.37K +14.1% 19.2K Feb 28, 2023 Direct F1
transaction SUM Class A Common Stock Options Exercise +2.41K +12.57% 21.6K Feb 28, 2023 Direct F1
transaction SUM Class A Common Stock Tax liability -$93.6K -3.17K -14.69% $29.54 18.4K Feb 28, 2023 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 -2.2K -100% $0.00* 0 Feb 28, 2023 Class A Common Stock 2.2K Direct F4, F5
transaction SUM Restricted Stock Units Options Exercise $0 -2.37K -50% $0.00 2.37K Feb 28, 2023 Class A Common Stock 2.37K Direct F4, F6
transaction SUM Restricted Stock Units Options Exercise $0 -2.41K -33.33% $0.00 4.82K Feb 28, 2023 Class A Common Stock 2.41K 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 and October 18, 2022.
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 vest in three equal annual installments beginning on February 28, 2021.
F6 These restricted stock units vest in three equal annual installments beginning on February 28, 2022.
F7 These restricted stock units vest in three equal annual installments beginning on February 28, 2023.

Remarks:

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