Edgar Filing: Summit Materials, Inc.

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

____________________________________

SCHEDULE 13G

Under the Securities Exchange Act of 1934

(Amendment No. 1)*

____________________________________

Summit Materials, Inc.

(Name of Issuer)

Class A Common Stock, $0.01 Par Value

(Title of Class of Securities)

86614U100

(CUSIP Number)

N/A

(Date of Event Which Requires Filing of this Statement)

____________________________________

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

☐ Rule 13d-1(b)

☒ Rule 13d-1(c)

☐ Rule 13d-1(d)

*	The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

CUSIP No. 86614U100


1.	NAMES OF REPORTING PERSONS Three Bays Capital LP
2.	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☒
3.	SEC USE ONLY
4.	CITIZENSHIP OR PLACE OF ORGANIZATION Delaware
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5.	SOLE VOTING POWER —0—
		6.	SHARED VOTING POWER —0—
		7.	SOLE DISPOSITIVE POWER —0—
		8.	SHARED DISPOSITIVE POWER —0—
9.	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON —0—
10.	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) ☐
11.	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0%
12.	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) PN, IA

CUSIP No. 86614U100


1.	NAMES OF REPORTING PERSONS TBC GP LLC
2.	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☒
3.	SEC USE ONLY
4.	CITIZENSHIP OR PLACE OF ORGANIZATION Delaware
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5.	SOLE VOTING POWER —0—
		6.	SHARED VOTING POWER —0—
		7.	SOLE DISPOSITIVE POWER —0—
		8.	SHARED DISPOSITIVE POWER —0—
9.	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON —0—
10.	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) ☐
11.	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0%
12.	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) OO

CUSIP No. 86614U100


1.	NAMES OF REPORTING PERSONS TBC Master LP
2.	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☒
3.	SEC USE ONLY
4.	CITIZENSHIP OR PLACE OF ORGANIZATION Cayman Islands
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5.	SOLE VOTING POWER —0—
		6.	SHARED VOTING POWER —0—
		7.	SOLE DISPOSITIVE POWER —0—
		8.	SHARED DISPOSITIVE POWER —0—
9.	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON —0—
10.	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) ☐
11.	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0%
12.	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) PN

CUSIP No. 86614U100


1.	NAMES OF REPORTING PERSONS TBC Partners GP LLC
2.	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☒
3.	SEC USE ONLY
4.	CITIZENSHIP OR PLACE OF ORGANIZATION Delaware
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5.	SOLE VOTING POWER —0—
		6.	SHARED VOTING POWER —0—
		7.	SOLE DISPOSITIVE POWER —0—
		8.	SHARED DISPOSITIVE POWER —0—
9.	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON —0—
10.	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) ☐
11.	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0%
12.	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) OO

CUSIP No. 86614U100


1.	NAMES OF REPORTING PERSONS Matthew Sidman
2.	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☒
3.	SEC USE ONLY
4.	CITIZENSHIP OR PLACE OF ORGANIZATION United States
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5.	SOLE VOTING POWER —0—
		6.	SHARED VOTING POWER —0—
		7.	SOLE DISPOSITIVE POWER —0—
		8.	SHARED DISPOSITIVE POWER —0—
9.	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON —0—
10.	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) ☐
11.	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0%
12.	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) IN

Item 1 (a).

Name of Issuer:

Summit Materials, Inc. (the "Issuer")

Item 1 (b).

Address of Issuer's Principal Executive Offices:

1550 Wynkoop Street, 3rd Floor

Denver, Colorado 80202

Item 2 (a).

Name of Person Filing:

This statement is being filed by the following persons with respect to the shares of Class A Common Stock of the Issuer that were directly owned by TBC Master LP ("TBC Master"):

(i)

Three Bays Capital LP ("Three Bays Capital"), a Delaware limited partnership and investment manager to TBC Master;

(ii)

TBC GP LLC ("TBC GP"), a Delaware limited liability company and the General Partner of Three Bays Capital;

(iii)

TBC Master, a Cayman Islands exempted limited partnership;

(iv)

TBC Partners GP LLC ("TBC Partners GP"), a Delaware limited liability company and the General Partner of TBC Master; and

(v)

Matthew Sidman, the Managing Member of TBC GP and TBC Partners GP.

The above parties are sometimes individually referred to herein as a "Reporting Person" and collectively as the "Reporting Persons".

Item 2 (b).

Address of Principal Business Office or, if None, Residence:

The address for each of the Reporting Persons (except TBC Master) is:

c/o Three Bays Capital LP

222 Berkeley Street, 19th Floor

Boston, Massachusetts 02116

The address for TBC Master is:

c/o Morgan Stanley Fund Services (Cayman) Ltd.

Cayman Corporate Centre

27 Hospital Road

George Town, Grand Cayman KY1-9008

Cayman Islands

Item 2 (c).

Citizenship:

Three Bays Capital – Delaware

TBC GP – Delaware

TBC Master – Cayman Islands

TBC Partners GP – Delaware

Matthew Sidman – United States

Item 2 (d).

Title of Class of Securities:

Class A Common Stock, $0.01 par value ("Class A Common Stock")

Item 2 (e).

CUSIP Number:

86614U100

Item 3.

Not applicable.

Item 4.

Ownership.

For each of the Reporting Persons:

(a)

Amount beneficially owned: 0 shares of Class A Common Stock

(b)

Percent of class: 0%

(c)

Number of shares as to which such person has:

(i)

Sole power to vote or to direct the vote: —0—

(ii)

Shared power to vote or to direct the vote: —0—

(iii)

Sole power to dispose or to direct the disposition of: —0—

(iv)

Shared power to dispose or to direct the disposition of: —0—

Three Bays Capital is the investment manager of TBC Master. TBC GP is the General Partner of Three Bays Capital. TBC Partners GP is the General Partner of TBC Master. Matthew Sidman is the Managing Member of TBC GP and TBC Partners GP.

Each Reporting Person may have been deemed to beneficially own the Class A Common Stock that was held directly by TBC Master, but neither the filing of this Schedule 13G nor any of its contents shall be deemed to constitute an admission that any Reporting Person other than TBC Master was the beneficial owner of Class A Common Stock referred to herein for purposes of Section 13(d) of the Securities Exchange Act of 1934, as amended, or for any other purpose (including, without limitation, any tax purposes) and each of the Reporting Persons other than TBC Master expressly disclaims beneficial ownership of all shares of Class A Common Stock that were held directly by TBC Master and any assertion or presumption that it and the other persons on whose behalf this statement is filed constitute a "group".

Item 5.

Ownership of Five Percent or Less of a Class.

If this statement is being filed to report the fact that as of the date hereof any of the Reporting Persons have ceased to be the beneficial owners of more than five percent of the class of securities, check the following [X].

Item 6.

Ownership of More than Five Percent on Behalf of Another Person.

Certain feeder funds that are limited partners of TBC Master had the right to receive dividends from, and proceeds from, the sale of the Class A Common Stock that was directly held by TBC Master.

Item 7.

Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.

Not applicable.

Item 8.

Identification and Classification of Members of the Group.

Not applicable.

Item 9.

Notice of Dissolution of Group.

Not applicable.

Item 10.

Certification.

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

	December 13, 2018

	Date

	THREE BAYS CAPITAL LP

	By: TBC GP LLC, its General Partner

	/s/ Joe Gigliotti
	Signature

	Chief Financial Officer
	Name/Title

	TBC GP LLC

	/s/ Joe Gigliotti
	Signature

	Chief Financial Officer
	Name/Title

	TBC MASTER LP

	By: TBC Partners GP LLC, its General Partner

	/s/ Joe Gigliotti
	Signature

	Chief Financial Officer
	Name/Title


	TBC PARTNERS GP LLC

	/s/ Joe Gigliotti
	Signature

	Chief Financial Officer
	Name/Title

	MATTHEW SIDMAN

	/s/ Matthew Sidman
	Signature