Christopher B. Gaskill - Dec 28, 2021 Form 4 Insider Report for Summit Materials, Inc. (SUM)

Role
Title: EVP, Chief Legal Officer & Secretary
Signature
/s/ Christopher B. Gaskill
Stock symbol
SUM
Transactions as of
Dec 28, 2021
Transactions value $
-$58,230
Form type
4
Date filed
12/29/2021, 03:53 PM
Previous filing
Sep 8, 2021
Next filing
Mar 1, 2022

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction SUM Class A Common Stock Options Exercise +5K +33.59% 19.9K Dec 28, 2021 Direct F1
transaction SUM Class A Common Stock Tax liability -$58.2K -1.45K -7.27% $40.27 18.4K Dec 28, 2021 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 -5K -100% $0.00* 0 Dec 28, 2021 Class A Common Stock 5K Direct F2, F3
* 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 Each restricted stock unit represents a contingent right to receive one share of 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 compensation committee.
F3 On December 28, 2018, the Reporting Person was granted 15,000 restricted stock units that vested in three equal installments on each of December 28, 2019, December 28, 2020 and December 28, 2021.

Remarks:

Title: EVP, Chief Legal Officer & Secretary