Sec Form 4 Filing - Harris Brian James @ Summit Materials, Inc. - 2021-02-28

Insider filing report for Changes in Beneficial Ownership
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FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP
Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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1. Name and Address of Reporting Person
Harris Brian James
2. Issuer Name and Ticker or Trading Symbol
Summit Materials, Inc. [ SUM]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
X __ Officer (give title below) _____ Other (specify below)
EVP & Chief Financial Officer
(Last) (First) (Middle)
C/O SUMMIT MATERIALS, INC., 1550 WYNKOOP STREET, 3RD FLOOR
3. Date of Earliest Transaction (MM/DD/YY)
02/28/2021
(Street)
DENVER, CO80202
4. If Amendment, Date Original Filed (MM/DD/YY)
6. Individual or Joint/Group Filing (Check Applicable Line)
__ X __ Form filed by One Reporting Person
_____ Form filed by More than One Reporting Person
(City) (State) (Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code
(Instr. 8)
4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)
6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)
7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Class A Common Stock 02/28/2021 M 4,676 A 109,626 D
Class A Common Stock 02/28/2021 M 9,820 A 119,446 D
Class A Common Stock 02/28/2021 M 6,635 A 126,081 D
Class A Common Stock 02/28/2021 F 6,169 D $ 27.71 119,912 D
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code
(Instr. 8)
5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)
6. Date Exercisable and Expiration Date
(MM/DD/YY)
7. Title and Amount of Underlying Securities
(Instr. 3 and 4)
8. Price of Derivative Security
(Instr. 5)
9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)
10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)
11. Nature of Indirect Benef icial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Restricted Stock Units ( 2 ) 02/28/2021 M 4,676 ( 3 ) ( 3 ) Class A Common Stock 4,676 $ 0 0 D
Restricted Stock Units ( 2 ) 02/28/2021 M 9,820 ( 4 ) ( 4 ) Class A Common Stock 9,820 $ 0 9,820 D
Restricted Stock Units ( 2 ) 02/28/2021 M 6,635 ( 5 ) ( 5 ) Class A Common Stock 6,635 $ 0 13,270 D
Reporting Owners
Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Harris Brian James
C/O SUMMIT MATERIALS, INC.
1550 WYNKOOP STREET, 3RD FLOOR
DENVER, CO80202
EVP & Chief Financial Officer
Signatures
/s/Anne Lee Benedict, as Attorney-in-Fact 03/02/2021
Signature of Reporting Person Date
Explanation of Responses:
( 1 )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.
( 2 )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.
( 3 )On February 28, 2018, the Reporting Person was granted 14,027 restricted stock units that vest in three equal annual installments beginning on February 28, 2019.
( 4 )On February 28, 2019, the Reporting Person was granted 29,460 restricted stock units that vest in three equal annual installments beginning on February 28, 2020.
( 5 )On February 28, 2020, the Reporting Person was granted 19,905 restricted stock units that vest in three equal annual installments beginning on February 28, 2021.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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