SEC FORM 4

SEC Form 4

FORM 4

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
or Section 30(h) of the Investment Company Act of 1940

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person^*

Benedict Anne Lee

(Last)

(First)

(Middle)

C/O SUMMIT MATERIALS, INC.

1550 WYNKOOP STREET, 3RD FLOOR

(Street)

DENVER

80202

(City)

(State)

(Zip)

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)
	See Remarks

3. Date of Earliest Transaction (Month/Day/Year)
02/27/2018

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Class A Common Stock	02/27/2018		M		21,756	A	$18	27,258	D
Class A Common Stock	02/27/2018		M		4,411	A	$17.07	31,669	D
Class A Common Stock	02/27/2018		S		26,167	D	$32.32⁽¹⁾	5,502	D
Class A Common Stock	02/28/2018		M		1,793	A	⁽²⁾	7,295	D
Class A Common Stock	02/28/2018		F		520	D	$31.63	6,775	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 (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	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 (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (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: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Options (right to buy)	$18	02/27/2018		M			21,756	⁽³⁾	03/11/2025	Class A Common Stock	21,756	$0	21,756	D
Options (right to buy)	$17.07	02/27/2018		M			4,411	⁽⁴⁾	02/24/2026	Class A Common Stock	4,411	$0	4,412	D
Restricted Stock Units	⁽⁵⁾	02/28/2018		M			1,793	⁽⁶⁾	⁽⁶⁾	Class A Common Stock	1,793	$0	3,584	D
Restricted Stock Units	⁽⁵⁾	02/28/2018		A		8,256		⁽⁷⁾	⁽⁷⁾	Class A Common Stock	8,256	$0	8,256	D

Explanation of Responses:

1. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $32.16 to $32.43, 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.

2. 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.

3. Reflects the grant of 43,512 options that vest in four equal annual installments beginning on March 11, 2016.

4. Reflects the grant of 13,235 options that vest in three equal annual installments beginning on February 24, 2017.

5. 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.

6. On February 28, 2017, the Reporting Person was granted 5,377 restricted stock units that vest in three equal annual installments beginning on February 28, 2018.

7. These restricted stock units vest in three equal annual installments beginning on February 28, 2019.

Remarks:

Title: EVP, Chief Legal Officer & Secretary

	/s/Anne Lee Benedict	03/01/2018
	** Signature of Reporting Person	Date
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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