Karli S. Anderson - Jul 30, 2021 Form 4 Insider Report for Summit Materials, Inc. (SUM)

Role
Title: EVP, Chief ESG Officer and Head of Investor Relations
Signature
/s/ Christopher B. Gaskill, as Attorney-in-Fact
Stock symbol
SUM
Transactions as of
Jul 30, 2021
Transactions value $
-$55,474
Form type
4
Date filed
8/3/2021, 05:00 PM
Previous filing
May 25, 2021
Next filing
Sep 8, 2021

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction SUM Class A Common Stock Options Exercise +5.71K +266.37% 7.86K Jul 30, 2021 Direct F1
transaction SUM Class A Common Stock Tax liability -$55.5K -1.65K -21.02% $33.60 6.2K Jul 30, 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 -5.71K -50% $0.00 5.71K Jul 30, 2021 Class A Common Stock 5.71K 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 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 The Reporting Person was granted 11,421 restricted stock units that vest in two equal annual installments beginning on July 30, 2021.

Remarks:

Title: EVP, Chief ESG Officer and Head of Investor Relations