X0306
4
2019-02-28
0
0001621563
Summit Materials, Inc.
SUM
0001661446
Beck Thomas A.
C/O SUMMIT MATERIALS, INC.
1550 WYNKOOP STREET, 3RD FLOOR
DENVER
CO
80202
0
1
0
0
See Remarks
Class A Common Stock
2019-02-28
4
M
0
1778
A
16329
D
Class A Common Stock
2019-02-28
4
M
0
2703
A
19032
D
Class A Common Stock
2019-02-28
4
F
0
1417
17.00
D
17615
D
Restricted Stock Units
2019-02-28
4
M
0
1778
0
D
Class A Common Stock
1778
1778
D
Restricted Stock Units
2019-02-28
4
M
0
2703
0
D
Class A Common Stock
2703
5408
D
Restricted Stock Units
2019-02-28
4
A
0
17036
0
A
Class A Common Stock
17036
17036
D
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.
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.
On February 28, 2017, the Reporting Person was granted 5,334 restricted stock units that vest in three equal annual installments beginning on February 28, 2018.
On February 28, 2018, the Reporting Person was granted 8,111 restricted stock units that vest in three equal annual installments beginning on February 28, 2019.
These restricted stock units vest in three equal annual installments beginning on February 28, 2020.
Title: EVP and Cement Division President
/s/Anne Lee Benedict, as Attorney-in-Fact
2019-03-04