SEC Form 4 · accession 0001104659-17-039985

Summit Materials, Inc. · SUM

Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗

Reporting owner

Officer — See Remarks

Period of report

Jun 14, 2017

Accepted (ET)

Jun 16, 2017 · 6:01 pm EDT

Rule 10b5-1 plan

unknown — predates the checkbox

Issuer CIK

0001621563

Table I — non-derivative securities

Security	Date	Code	Shares	Price	A/D	Owned after	D/I	Nature of ownership
Class A Common Stock^F1	Jun 14, 2017	C	7,500	—	A	11,213	D
Class A Common Stock^F2	Jun 14, 2017	S	7,500	$28.48	D	3,713	D

Security	Conv. / exercise price	Date	Code	Shares	A/D	Exercisable	Expires	Underlying	Underlying shares	Owned after	D/I
LP Units of Summit Materials Holdings L.P.^F1	—	Jun 14, 2017	C	7,500	D	—	—	Class A Common Stock	7,500	71,422	D

F1Pursuant to the terms of an exchange agreement, dated as of March 11, 2015, the limited partnership units of Summit Materials Holdings L.P. ("LP Units") reported herein are exchangeable from and after the first anniversary of the closing of the issuer's initial public offering (subject to the terms of the exchange agreement and vesting requirements, including certain vesting events more fully described in the issuer's Registration Statement on Form S-1 (File No. 333-201058)) for shares of the issuer's Class A common stock on a one-for-one basis.
F2The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $28.482 to $28.49, inclusive. The Reporting Person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth above.

Title: EVP, Chief Legal Officer & Secretary