Christopher Burke Gaskill - 28 Feb 2023 Form 4 Insider Report for Summit Materials, Inc.

Role
Title: Executive Vice President, Chief Legal Officer and Secretary
Signature
/s/ Christopher B. Gaskill
Issuer symbol
N/A
Transactions as of
28 Feb 2023
Net transactions value
-$112,931
Form type
4
Filing time
01 Mar 2023, 16:41:04 UTC
Previous filing
24 Feb 2023
Next filing
06 Dec 2023
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 +2,692 +13% 23,779 28 Feb 2023 Direct F1, F2, F3
transaction SUM Class A Common Stock Options Exercise +3,062 +13% 26,841 28 Feb 2023 Direct F1
transaction SUM Class A Common Stock Options Exercise +2,697 +10% 29,538 28 Feb 2023 Direct F1
transaction SUM Class A Common Stock Tax liability $112,931 -3,823 -13% $29.54 25,715 28 Feb 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 -2,692 -100% $0.000000* 0 28 Feb 2023 Class A Common Stock 2,692 Direct F4, F5
transaction SUM Restricted Stock Units Options Exercise $0 -3,061 -50% $0.000000 3,062 28 Feb 2023 Class A Common Stock 3,061 Direct F4, F6
transaction SUM Restricted Stock Units Options Exercise $0 -2,697 -33% $0.000000 5,392 28 Feb 2023 Class A Common Stock 2,697 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 The Reporting Person was granted 8,077 restricted stock units that vest in three equal annual installments beginning on February 28, 2021.
F6 The Reporting Person was granted 9,185 restricted stock units that vest in three equal annual installments beginning on February 28, 2022.
F7 The Reporting Person was granted 8,089 restricted stock units that vest in three equal annual installments beginning on February 28, 2023.

Remarks:

Title: Executive Vice President, Chief Legal Officer and Secretary