Christopher B. Gaskill - Sep 3, 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
Sep 3, 2021
Transactions value $
-$95,139
Form type
4
Date filed
9/8/2021, 04:19 PM
Previous filing
Aug 12, 2021
Next filing
Dec 29, 2021

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction SUM Class A Common Stock Options Exercise +10K +128.63% 17.8K Sep 3, 2021 Direct F1
transaction SUM Class A Common Stock Tax liability -$95.1K -2.89K -16.26% $32.92 14.9K Sep 3, 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 +10K $0.00* 0 Sep 3, 2021 Class A Common Stock 10K 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 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 compensation committee.
F3 On September 3, 2019, the Reporting Person was granted 10,000 restricted stock units that vest in one installment on September 3, 2021.

Remarks:

Title: EVP, Chief Legal Officer & Secretary