Ownership Submission

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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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(Print or Type Responses)

1. Name and Address of Reporting Person ^*

Grupo Argos S.A.

2. Date of Event Requiring Statement (Month/Day/Year)
01/12/2024

3. Issuer Name and Ticker or Trading Symbol
Summit Materials, Inc. [SUM]

(Last)

(First)

(Middle)

CARRERA 43A # 1A SUR - 143,, EDIFICIO SANTILLANA, TORRE SUR, PISO 3

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

__X__ Director	__X__ 10% Owner
_____ Officer (give title below)	_____ Other (specify below)

5. If Amendment, Date Original Filed (Month/Day/Year)
01/22/2024

(Street)

MEDELLIN, F8 050021

6. Individual or Joint/Group Filing (Check Applicable Line)
___ Form filed by One Reporting Person
_X_ Form filed by More than One Reporting Person

(City)

(State)

(Zip)

Table I - Non-Derivative Securities Beneficially Owned

1.Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Class A Common Stock ⁽¹⁾	6,172,416 ⁽²⁾	I	Held by Valle Cement Investments Inc.
Class A Common Stock ⁽¹⁾	48,547,584 ⁽³⁾	I	Held by Argos SEM, LLC
Series A Non-Convertible Preferred Stock ⁽¹⁾	1 ⁽⁴⁾	I	Held by Cementos Argos S.A.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.			SEC 1473 (7-02)
	Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address	Relationships
Reporting Owner Name / Address	Director	10% Owner	Officer	Other
Grupo Argos S.A. CARRERA 43A # 1A SUR - 143, EDIFICIO SANTILLANA, TORRE SUR, PISO 3 MEDELLIN, F8 050021	X	X
Cementos Argos S.A. CARRERA 43A # 1A SUR - 143 CENTRO SANTILLANA, TORRE NORTE, PISO 3 MEDELLIN, E3 050021	X	X
Argos SEM, LLC 251 LITTLE FALLS DRIVE WILMINGTON, DE 19808	X	X
Valle Cement Investments, Inc. CAPITAL PLAZA BUILDING, 15TH FLOOR, PASEO ROBERTO MOTTA, COSTA DEL ESTE PANAMA, R1 0816-02984	X

Signatures

/s/ Grupo Argos S.A., By: Rafael Olivella, Title: Vice President		01/26/2024
^**Signature of Reporting Person		Date
/s/ Cementos Argos S.A., By: Felipe Aristizabal, Title: Vice President		01/26/2024
^**Signature of Reporting Person		Date
/s/ Valle Cement Investments Inc., By: Gustavo Adolfo Uribe, Title: President		01/26/2024
^**Signature of Reporting Person		Date
/s/ Argos SEM, LLC, By: Gustavo Adolfo Uribe, Title: President		01/26/2024
^**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 5(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).
(1)	This Form 3 is filed jointly by (i) Grupo Argos S.A., a sociedad anonima incorporated in the Republic of Colombia ("Grupo Argos"), (ii) Cementos Argos S.A., a sociedad anonima incorporated in the Republic of Colombia ("Cementos Argos"), (iii) Argos SEM, LLC, a Delaware limited liability company ("Argos SEM") and (iv) Valle Cement Investments Inc., a sociedad anonima incorporated in the Republic of Panama ("Valle Cement" and collectively with Grupo Argos, Cementos Argos and Argos SEM, the "Reporting Persons"). Each of the Reporting Persons disclaims beneficial ownership of the securities reported herein except to the extent of its pecuniary interest therein.
(2)	Represents securities of Summit Materials, Inc., a Delaware corporation (the "Issuer"), directly owned by Valle Cement, which is a wholly-owned subsidiary of Cementos Argos S.A., which is a majority-owned subsidiary of Grupo Argos. Grupo Argos, as the controlling shareholder of Cementos Argos, which in turn is the sole shareholder of Valle Cement, has the power to vote and to dispose of the shares of Class A common stock, par value $0.01 per share ("Class A Common Stock"), of the Issuer directly owned by Valle Cement. As a result of this relationship, Grupo Argos may be deemed to be an indirect beneficial owner of the securities that are beneficially owned by Valle Cement. By reason of the provisions of Rule 13d-3 of the Securities Exchange Act of 1934, as amended, each of the Reporting Persons may be deemed to beneficially own the shares of Common Stock of the Issuer directly owned by Valle Cement.
(3)	Represents securities of the Issuer, directly owned by Argos SEM, which is a wholly-owned subsidiary of Cementos Argos, which is a majority-owned subsidiary of Grupo Argos. Grupo Argos, as the controlling shareholder of Cementos Argos, which in turn is the sole shareholder of Argos SEM, has the power to vote and to dispose of the shares of Class A Common Stock of the Issuer directly owned by Argos SEM. As a result of this relationship, Grupo Argos may be deemed to be an indirect beneficial owner of the securities that are beneficially owned by Argos SEM. By reason of the provisions of Rule 13d-3 of the Securities Exchange Act of 1934, as amended, each of the Reporting Persons may be deemed to beneficially own the shares of Common Stock of the Issuer directly owned by Argos SEM.
(4)	Represents securities of the Issuer, directly owned by Cementos Argos, which is a majority-owned subsidiary of Grupo Argos. Grupo Argos, as the controlling shareholder of Cementos Argos, has the power to vote and to dispose of the share of Series A Non-Convertible Preferred Stock of the Issuer directly owned by Cementos Argos. As a result of this relationship, Grupo Argos may be deemed to be an indirect beneficial owner of the securities that are beneficially owned by Cementos Argos. By reason of the provisions of Rule 13d- 3 of the Securities Exchange Act of 1934, as amended, each of the Reporting Persons may be deemed to beneficially own the shares of Series A Non-Convertible Preferred Stock of the Issuer directly owned by Cementos Argos.
Remarks: Note: This amendment is being made solely for the purpose of including the additional Reporting Persons, Grupo Argos S.A. and Cementos Argos S.A., as the entities' CIKs were unavailable at the time of filing the original Form 3. Grupo Argos S.A. has been designated the primary Reporting Person in this Form 3/A, which hereby amends and restates the original Form 3, which was timely filed on January 22, 2024, in its entirety.

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