SUM / Summit Materials, Inc. - Pengajuan SECLaporan Tahunan, Pernyataan Proksi

Summit Materials, Inc.
US ˙ NYSE ˙ US86614U1007
HINDI NA ACTIVE ANG SIMBONG ITO

Mga Batayang Estadistika
LEI 549300C97P3BW8QROE16
CIK 1621563
SEC Filings
All companies that sell securities in the United States must register with the Securities and Exchange Commission (SEC) and file reports on a regular basis. These reports include company annual reports (10K, 10Q), news updates (8K), investor presentations (found in 8Ks), insider trades (form 4), ownership reports (13D, and 13G), and reports related to the specific securities sold, such as registration statements and prospectus. This page shows recent SEC filings related to Summit Materials, Inc.
SEC Filings (Chronological Order)
Halaman ini menyediakan daftar lengkap dan kronologis dari Pengajuan SEC, tidak termasuk pengajuan kepemilikan yang kami sediakan di tempat lain.
February 21, 2025 15-12G

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 15 CERTIFICATION AND NOTICE OF TERMINATION OF REGISTRATION UNDER SECTION 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR SUSPENSION OF DUTY TO FILE REPORTS UNDER SECTIONS 13

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 15 CERTIFICATION AND NOTICE OF TERMINATION OF REGISTRATION UNDER SECTION 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR SUSPENSION OF DUTY TO FILE REPORTS UNDER SECTIONS 13 AND 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934. Commission File Number: 001-36873 Summit Materials, Inc. (Exact name of registrant as specified in

February 11, 2025 EX-99.25

EX-99.25

NOTIFICATION OF THE REMOVAL FROM LISTING AND REGISTRATION OF THE STATED SECURITIES The New York Stock Exchange hereby notifies the SEC of its intention to remove the entire class of the stated securities from listing and registration on the Exchange at the opening of business on February 24, 2025, pursuant to the provisions of Rule 12d2-2 (a).

February 10, 2025 8-K

Changes in Control of Registrant, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Entry into a Material Definitive Agreement, Termination of a Material Definitive Agreement, Material Modification to Rights of Security Holders, Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing, Financial Statements and Exhibits, Completion of Acquisition or Disposition of Assets, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): February 10, 2025 Summit Materials, Inc. (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 (State or Other Jurisdiction (Commission (I.R.S. Employe

February 10, 2025 EX-99.1

Summit Materials Completes Merger with Quikrete

Exhibit 99.1 Summit Materials Completes Merger with Quikrete Denver, Co. February 10, 2025 – Summit Materials, Inc. (NYSE: SUM) (“Summit,” “Summit Materials” or the “Company”), a leading producer of aggregates and cement, today announced the closing of its previously announced definitive agreement to be acquired by Quikrete Holdings, Inc. (“Quikrete”) for $52.50 per share in cash, for a total ente

February 10, 2025 EX-10.1

Amendment to Restrictive Covenant Agreement

Exhibit 10.1 Amendment to Restrictive Covenant Agreement This FIRST AMENDMENT TO THE RESTRICTIVE COVENANT AGREEMENT (this “Amendment”) dated as of February 10, 2025, is entered into by and among Summit Materials, Inc., a Delaware corporation (the “Company”), Grupo Argos S.A., a sociedad anónima incorporated in the Republic of Colombia (“Grupo”), and Cementos Argos S.A., a sociedad anónima incorpor

February 10, 2025 EX-3.1

THIRD AMENDED AND RESTATED CERTIFICATE OF INCORPORATION SUMMIT MATERIALS, INC.

Exhibit 3.1 THIRD AMENDED AND RESTATED CERTIFICATE OF INCORPORATION of SUMMIT MATERIALS, INC. 1. Name. The name of the corporation is Summit Materials, Inc. (the “Corporation”). 2. Address; Registered Office and Agent. The address of the Corporation’s registered office is 1521 Concord Pike Suite 201, City of Wilmington, County of New Castle, State of Delaware 19803; and the name of its registered

February 10, 2025 S-8 POS

As filed with the Securities and Exchange Commission on February 10, 2025

As filed with the Securities and Exchange Commission on February 10, 2025 Registration No.

February 10, 2025 POSASR

As filed with the Securities and Exchange Commission on February 10, 2025

As filed with the Securities and Exchange Commission on February 10, 2025 Registration No.

February 10, 2025 S-8 POS

As filed with the Securities and Exchange Commission on February 10, 2025

As filed with the Securities and Exchange Commission on February 10, 2025 Registration No.

February 10, 2025 S-8 POS

As filed with the Securities and Exchange Commission on February 10, 2025

As filed with the Securities and Exchange Commission on February 10, 2025 Registration No.

February 10, 2025 EX-3.2

FIFTH AMENDED AND RESTATED BYLAWS SUMMIT MATERIALS, INC. (a Delaware Corporation) TABLE OF CONTENTS

Exhibit 3.2 FIFTH AMENDED AND RESTATED BYLAWS Of SUMMIT MATERIALS, INC. (a Delaware Corporation) TABLE OF CONTENTS Page Article 1 DEFINITIONS 1 Article 2 STOCKHOLDERS 2 Article 3 DIRECTORS 7 Article 4 COMMITTEES OF THE BOARD 9 Article 5 OFFICERS 9 Article 6 GENERAL PROVISIONS 11 Article 1 DEFINITIONS As used in these Bylaws, unless the context otherwise requires, the term: 1.1 “Assistant Secretary

February 5, 2025 8-K

Financial Statements and Exhibits, Other Events, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): February 5, 2025 Summit Materials, Inc. (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 (State or Other Jurisdiction (Commission (I.R.S. Employer

February 5, 2025 EX-99.1

2

EXHIBIT 99.1 Summit Materials Announces Stockholder Approval of Quikrete Transaction Company Release - 02/05/2025 DENVER, Feb. 5, 2025 /PRNewswire/ - Summit Materials, Inc. (NYSE: SUM) ("Summit," "Summit Materials" or the "Company"), a leading producer of aggregates and cement, today announced that the Company has obtained all requisite stockholder approvals in connection with the proposed acquisi

January 28, 2025 8-K

Regulation FD Disclosure, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): January 28, 2025 Summit Materials, Inc. (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 (State or Other Jurisdiction (Commission (I.R.S. Employer

January 27, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): January 27, 2025 Summit Material

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): January 27, 2025 Summit Materials, Inc. (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 (State or Other Jurisdiction (Commission (I.R.S. Employer

January 10, 2025 EX-99.1

Summit Materials Announces Expiration of HSR Act Waiting Period for Acquisition by Quikrete

Exhibit 99.1 Summit Materials Announces Expiration of HSR Act Waiting Period for Acquisition by Quikrete Company Release - 01/07/2025 DENVER, Jan. 7, 2025 /PRNewswire/ - Summit Materials, Inc. (NYSE: SUM) ("Summit," "Summit Materials" or the "Company"), a leading producer of aggregates and cement, today announced the expiration of the waiting period under the Hart-Scott-Rodino Antitrust Improvemen

January 10, 2025 EX-99.2

Summit Materials Announces Expiration of the Competition Act (Canada) Waiting Period for Acquisition by Quikrete

Exhibit 99.2 Summit Materials Announces Expiration of the Competition Act (Canada) Waiting Period for Acquisition by Quikrete Company Release - 01/09/2025 DENVER, Jan. 9, 2025 /PRNewswire/ - Summit Materials, Inc. (NYSE: SUM) ("Summit," "Summit Materials" or the "Company"), a leading producer of aggregates and cement, today announced the expiration of the waiting period under the Competition Act (

January 10, 2025 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): January 10, 2025 (January 6, 2025) Summit Materials, Inc. (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 (State or Other Jurisdiction (Commissio

January 10, 2025 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934 Filed by the Registrant x Filed by a Party other than the Registrant ¨ Check the appropriate box: ¨ Preliminary Proxy Statement ¨ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ¨ Definitive Proxy State

January 7, 2025 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Definitive Proxy State

December 30, 2024 DEFM14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant  ☐ Check the appropriate box:  ☐ Preliminary Proxy Statement  ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a 6(e)(2)) ☒ D

December 26, 2024 EX-10.4

Summit Materials, Inc.

EX-10.4 5 dp222690ex1004.htm EXHIBIT 10.4 Exhibit 10.4 Summit Materials, Inc. December 18, 2024 Chris Gaskill 2400 S Columbine St. Denver, CO 80210 Dear Chris: This letter memorializes our recent discussions concerning tax planning actions in connection with the transactions (the “Merger”) contemplated by the Agreement and Plan of Merger by and among Summit Materials, Inc. (the “Company”), Quikret

December 26, 2024 EX-10.1

Summit Materials, Inc.

EX-10.1 2 dp222690ex1001.htm EXHIBIT 10.1 Exhibit 10.1 Summit Materials, Inc. December 18, 2024 Anne Noonan 520 Steel Street Denver, CO 8/0206 Dear Anne: This letter memorializes our recent discussions concerning tax planning actions in connection with the transactions (the “Merger”) contemplated by the Agreement and Plan of Merger by and among Summit Materials, Inc. (the “Company”), Quikrete Hold

December 26, 2024 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): December 26, 2024 (December 20, 2024) Summit Materials, Inc. (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 (State or Other Jurisdiction (Commis

December 26, 2024 EX-10.2

Summit Materials, Inc.

EX-10.2 3 dp222690ex1002.htm EXHIBIT 10.2 Exhibit 10.2 Summit Materials, Inc. December 18, 2024 Scott Anderson 1530 NE 39th St. Topeka, KS 66617 Dear Scott: This letter memorializes our recent discussions concerning tax planning actions in connection with the transactions (the “Merger”) contemplated by the Agreement and Plan of Merger by and among Summit Materials, Inc. (the “Company”), Quikrete H

December 26, 2024 EX-10.3

Summit Materials, Inc.

EX-10.3 4 dp222690ex1003.htm EXHIBIT 10.3 Exhibit 10.3 Summit Materials, Inc. December 18, 2024 Karli Anderson 3066 S Saint Paul St. Denver, CO 80210 Dear Karli: This letter memorializes our recent discussions concerning tax planning actions in connection with the transactions (the “Merger”) contemplated by the Agreement and Plan of Merger by and among Summit Materials, Inc. (the “Company”), Quikr

December 20, 2024 EX-FILING FEES

CALCULATION OF FILING FEE TABLES Schedule 14A (Form Type) Summit Materials, Inc. (Exact Name of Registrant as Specified in its Charter) T able 1: Transaction Valuation

Exhibit 107 CALCULATION OF FILING FEE TABLES Schedule 14A (Form Type) Summit Materials, Inc.

December 20, 2024 PREM14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant  ☐ Check the appropriate box: ☒ Preliminary Proxy Statement  ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a 6(e)(2))  ☐ D

November 25, 2024 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant ¨ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Definitive Proxy State

November 25, 2024 EX-99.1

VOTING AGREEMENT

Exhibit 99.1 VOTING AGREEMENT This VOTING AGREEMENT (this “Agreement”), dated as of November 24, 2024, is by and among (i) Quikrete Holdings, Inc., a Delaware corporation (“Parent”), and (ii) in their respective capacities as record and beneficial owners of Common Shares (as defined below), Cementos Argos S.A., a sociedad anónima incorporated in the Republic of Colombia (“Cementos”), Argos SEM LLC

November 25, 2024 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Definitive Proxy State

November 25, 2024 EX-2.1

AGREEMENT AND PLAN OF MERGER dated as of November 24, 2024 SUMMIT MATERIALS, INC., QUIKRETE HOLDINGS, INC. SOAR SUBSIDIARY, INC. TABLE OF CONTENTS

Exhibit 2.1 AGREEMENT AND PLAN OF MERGER dated as of November 24, 2024 among SUMMIT MATERIALS, INC., QUIKRETE HOLDINGS, INC. and SOAR SUBSIDIARY, INC. TABLE OF CONTENTS Page Article 1 Definitions Section 1.01. Definitions 1 Section 1.02. Other Definitional and Interpretative Provisions 15 Article 2 The Merger Section 2.01. The Merger 16 Section 2.02. Conversion of Shares 16 Section 2.03. Surrender

November 25, 2024 EX-99.1

VOTING AGREEMENT

EX-99.1 2 d857972dex991.htm EX-99.1 Exhibit 99.1 VOTING AGREEMENT This VOTING AGREEMENT (this “Agreement”), dated as of November 24, 2024, is by and among (i) Quikrete Holdings, Inc., a Delaware corporation (“Parent”), and (ii) in their respective capacities as record and beneficial owners of Common Shares (as defined below), Cementos Argos S.A., a sociedad anónima incorporated in the Republic of

November 25, 2024 SC 13D/A

SUM / Summit Materials, Inc. / Argos SEM, LLC - SC 13D/A Activist Investment

SC 13D/A 1 d857972dsc13da.htm SC 13D/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 1)* SUMMIT MATERIALS, INC. (Name of Issuer) Class A Common Stock (par value $0.01 per share) (Title of Class of Securities) 86614U100 (CUSIP Number) GRUPO ARGOS S.A. Carrera 43A # 1A Sur - 143 Edificio Santillana, Torre

November 25, 2024 EX-99.2

Summit Materials Enters into Definitive Agreement to be Acquired by Quikrete for $52.50 Per Share in Cash Compelling Premium Maximizes Value to Shareholders

Exhibit 99.2 Summit Materials Enters into Definitive Agreement to be Acquired by Quikrete for $52.50 Per Share in Cash Compelling Premium Maximizes Value to Shareholders Denver, Co. November 25, 2024 – Summit Materials, Inc. (NYSE: SUM), (“Summit,” “Summit Materials,” “Summit Inc.” or the “Company”) a leading producer of aggregates and cement, today announced it has entered into a definitive agree

November 25, 2024 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): November 25, 2024 (November 24,

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): November 25, 2024 (November 24, 2024) Summit Materials, Inc. (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 (State or Other Jurisdictionof Incor

November 25, 2024 EX-99.1

VOTING AGREEMENT

Exhibit 99.1 VOTING AGREEMENT This VOTING AGREEMENT (this “Agreement”), dated as of November 24, 2024, is by and among (i) Quikrete Holdings, Inc., a Delaware corporation (“Parent”), and (ii) in their respective capacities as record and beneficial owners of Common Shares (as defined below), Cementos Argos S.A., a sociedad anónima incorporated in the Republic of Colombia (“Cementos”), Argos SEM LLC

November 25, 2024 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Definitive Proxy State

November 25, 2024 8-K

Regulation FD Disclosure, Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): November 25, 2024 (November 24, 2024) Summit Materials, Inc. (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 (State or Other Jurisdictionof Incor

November 25, 2024 EX-99.2

Summit Materials Enters into Definitive Agreement to be Acquired by Quikrete for $52.50 Per Share in Cash Compelling Premium Maximizes Value to Shareholders

Exhibit 99.2 Summit Materials Enters into Definitive Agreement to be Acquired by Quikrete for $52.50 Per Share in Cash Compelling Premium Maximizes Value to Shareholders Denver, Co. November 25, 2024 – Summit Materials, Inc. (NYSE: SUM), (“Summit,” “Summit Materials,” “Summit Inc.” or the “Company”) a leading producer of aggregates and cement, today announced it has entered into a definitive agree

November 25, 2024 EX-2.1

AGREEMENT AND PLAN OF MERGER dated as of November 24, 2024 SUMMIT MATERIALS, INC., QUIKRETE HOLDINGS, INC. SOAR SUBSIDIARY, INC. TABLE OF CONTENTS

Exhibit 2.1 AGREEMENT AND PLAN OF MERGER dated as of November 24, 2024 among SUMMIT MATERIALS, INC., QUIKRETE HOLDINGS, INC. and SOAR SUBSIDIARY, INC. TABLE OF CONTENTS Page Article 1 Definitions Section 1.01. Definitions 1 Section 1.02. Other Definitional and Interpretative Provisions 15 Article 2 The Merger Section 2.01. The Merger 16 Section 2.02. Conversion of Shares 16 Section 2.03. Surrender

November 25, 2024 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant ¨ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Definitive Proxy State

November 25, 2024 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934 Filed by the Registrant x Filed by a Party other than the Registrant ¨ Check the appropriate box: ¨ Preliminary Proxy Statement ¨ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ¨ Definitive Proxy State

November 25, 2024 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Definitive Proxy State

November 15, 2024 EX-3.1

FOURTH AMENDED AND RESTATED SUMMIT MATERIALS, INC. ARTICLE I.

Exhibit 3.1 FOURTH AMENDED AND RESTATED BYLAWS OF SUMMIT MATERIALS, INC. ARTICLE I. Offices Section 1. Registered Office. The registered office and registered agent of Summit Materials, Inc. (the “Corporation”) in the State of Delaware shall be as set forth in the Corporation’s certificate of incorporation as then in effect (as the same may be amended and/or restated from time to time, the “Restat

November 15, 2024 EX-3.2

FOURTHTHIRD AMENDED AND RESTATED SUMMIT MATERIALS, INC. ARTICLE I.

Exhibit 3.2 FOURTHTHIRD AMENDED AND RESTATED BYLAWS OF SUMMIT MATERIALS, INC. ARTICLE I. Offices Section 1. Registered Office. The registered office and registered agent of Summit Materials, Inc. (the “Corporation”) in the State of Delaware shall be as set forth in the Corporation’s certificate of incorporation as then in effect (as the same may be amended and/or restated from time to time, the “R

November 15, 2024 8-K

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): November 13, 2024 Summit Materials, Inc. (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 (State or Other Jurisdiction of Incorporation) (Commissio

November 12, 2024 SC 13G/A

SUM / Summit Materials, Inc. / MASSACHUSETTS FINANCIAL SERVICES CO /MA/ - SEC SCHEDULE 13G Passive Investment

SC 13G/A 1 SEC13GFiling.htm SEC SCHEDULE 13G 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) Common Stock (Title of Class of Securities) 86614U100 (CUSIP Number) September 30, 2024 (Date of Event Which Requires Filing of this Statement) Check the appropriate bo

October 31, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 28, 2024 ☐ TRANSITION REPO

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 28, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file numbers: 001-36873 (Sum

October 31, 2024 EX-95.1

Mine Safety Disclosures

Exhibit 95.1 Mine Safety Disclosures The operation of Summit Materials, Inc.’s and its subsidiaries’ (collectively, the “Company’s”) domestic aggregates quarries and mines are subject to regulation by the federal Mine Safety and Health Administration (“MSHA”) under the Federal Mine Safety and Health Act of 1977 (the “Mine Act”). MSHA inspects the Company’s quarries and mines on a regular basis and

October 30, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): October 30, 2024 Summit Materials, Inc. (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 (State or Other Jurisdiction (Commission (I.R.S. Employer

October 30, 2024 EX-99.1

Summit Materials, Inc. Reports Third Quarter 2024 Results Pricing Momentum Continues Sets ELEVATE Summit Record for Quality of Earnings Refining 2024 Guidance

Exhibit 99.1 Summit Materials, Inc. Reports Third Quarter 2024 Results Pricing Momentum Continues Sets ELEVATE Summit Record for Quality of Earnings Refining 2024 Guidance DENVER, CO. - (October 30, 2024) - Summit Materials, Inc. (NYSE: SUM) (“Summit,” “Summit Materials,” “Summit Inc.” or the “Company”), a market-leading producer of aggregates and cement company, today announced results for the th

August 22, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): August 22, 2024 Summit Materials

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): August 22, 2024 Summit Materials, Inc. (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 (State or Other Jurisdiction (Commission (I.R.S. Employer

August 6, 2024 EX-95.1

Mine Safety Disclosures

Exhibit 95.1 Mine Safety Disclosures The operation of Summit Materials, Inc.’s and its subsidiaries’ (collectively, the “Company’s”) domestic aggregates quarries and mines are subject to regulation by the federal Mine Safety and Health Administration (“MSHA”) under the Federal Mine Safety and Health Act of 1977 (the “Mine Act”). MSHA inspects the Company’s quarries and mines on a regular basis and

August 6, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 29, 2024 ☐ TRANSITION REPORT PU

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 29, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file numbers: 001-36873 (Summit M

August 5, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): August 5, 2024 Summit Materials, Inc. (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 (State or Other Jurisdiction (Commission (I.R.S. Employer o

August 5, 2024 EX-99.1

Summit Materials, Inc. Reports Second Quarter 2024 Results Argos USA Synergies On Track Sustained Aggregates Growth Reaffirming 2024 Guidance Range

Exhibit 99.1 Summit Materials, Inc. Reports Second Quarter 2024 Results Argos USA Synergies On Track Sustained Aggregates Growth Reaffirming 2024 Guidance Range DENVER, CO. - (August 5, 2024) - Summit Materials, Inc. (NYSE: SUM) (“Summit,” “Summit Materials,” “Summit Inc.” or the “Company”), a market-leading producer of aggregates and cement company, today announced results for the second quarter

July 25, 2024 EX-10.1

Amendment No. 8, dated as of July 25, 2024, to the Amended and Restated Credit Agreement, dated as of July 17, 2015 (as amended by Amendment No. 1, dated as of January 19, 2017, Amendment No. 2, dated as of November 21, 2017, Amendment No. 3, dated as of May 22, 2018, Amendment No. 4, dated as of February 25, 2019, Amendment No. 5, dated as of December 14, 2022, Amendment No. 6, dated as of January 10, 2023 and Amendment No. 7, dated as of January 12, 2024) among Summit Materials, LLC, as the borrower, the guarantors party thereto, the several banks and other financial institutions or entities from time to time party thereto, Bank of America, N.A., as administrative agent, collateral agent, L/C issuer and swing line lender and the other parties thereto.

Exhibit 10.1 Execution Version AMENDMENT No. 8, dated as of July 25, 2024 (this “Amendment”) among SUMMIT MATERIALS, LLC, a Delaware limited liability company (the “Borrower”), the Guarantors party hereto, the Term B-2 Lenders party hereto and BANK OF AMERICA, N.A., as Administrative Agent (the “Administrative Agent”), Collateral Agent, L/C Issuer and Swing Line Lender, to the Amended and Restated

July 25, 2024 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): July 25, 2024 Summit Materials, Inc. (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 (State or Other Jurisdiction of Incorporation) (Commission Fi

May 22, 2024 8-K

Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): May 21, 2024 Summit Materials, Inc. (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 (State or Other Jurisdiction (Commission (I.R.S. Employer of

May 6, 2024 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. 1)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. 1) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, For Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Defi

May 6, 2024 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. 1)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. 1) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, For Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Defi

May 2, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 30, 2024 ☐ TRANSITION REPORT P

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 30, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file numbers: 001-36873 (Summit

May 2, 2024 EX-99.1

Summit Materials, LLC’s Unaudited Consolidated Financial Statements and Notes to Unaudited Consolidated Financial Statements.

Exhibit 99.1 SUMMIT MATERIALS, LLC AND SUBSIDIARIES Consolidated Balance Sheets (In thousands) March 30, December 30, 2024 2023 (unaudited) (audited) Assets Current assets: Cash and cash equivalents $ 486,208 $ 355,669 Restricted cash — 800,000 Accounts receivable, net 454,799 287,252 Costs and estimated earnings in excess of billings 11,681 10,289 Inventories 338,501 241,350 Other current assets

May 2, 2024 EX-10.13

Mining Lease Agreement, dated April 1, 1986, by and between Florida Rock Industries, Inc. and Florida Rock Properties, Inc., as amended.

Exhibit 10.13 [***] CERTAIN INFORMATION IN THIS DOCUMENT HAS BEEN EXCLUDED PURSUANT TO REGULATION S-K, ITEM 601(B)(10). SUCH EXCLUDED INFORMATION IS NOT MATERIAL AND IS OF THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE AND CONFIDENTIAL. MINING LEASE AGREEMENT This agreement, made and entered into this 1st day of April, 1986, by and between FLORIDA ROCK INDUSTRIES, INC., a Florida corporation, with

May 2, 2024 EX-95.1

Mine Safety Disclosures

Exhibit 95.1 Mine Safety Disclosures The operation of Summit Materials, Inc.’s and its subsidiaries’ (collectively, the “Company’s”) domestic aggregates quarries and mines are subject to regulation by the federal Mine Safety and Health Administration (“MSHA”) under the Federal Mine Safety and Health Act of 1977 (the “Mine Act”). MSHA inspects the Company’s quarries and mines on a regular basis and

May 1, 2024 EX-99.1

Summit Materials, Inc. Reports First Quarter 2024 Results Margin Expansion Fueled by Pricing Momentum and Operational Improvements Raises 2024 Synergy Target to At Least $40 million Adjusting 2024 Guidance Higher

Exhibit 99.1 Summit Materials, Inc. Reports First Quarter 2024 Results Margin Expansion Fueled by Pricing Momentum and Operational Improvements Raises 2024 Synergy Target to At Least $40 million Adjusting 2024 Guidance Higher DENVER, CO. - (May 1, 2024) - Summit Materials, Inc. (NYSE: SUM) (“Summit,” “Summit Materials,” “Summit Inc.” or the “Company”), market-leading producer of aggregates and cem

May 1, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): May 1, 2024 Summit Materials, Inc. (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 (State or Other Jurisdiction (Commission (I.R.S. Employer of I

April 26, 2024 EX-99.2

UNAUDITED PRELIMINARY PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION

Exhibit 99.2 UNAUDITED PRELIMINARY PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION In January 2024, Summit Materials, Inc. (the “Company” or “Summit Inc.”) completed a combination with Argos North America Corp. (“Argos USA”), Cementos Argos S.A. (“Cementos Argos”), Argos SEM LLC and Valle Cement Investments, Inc., pursuant to which Summit acquired all of the outstanding equity interests (the “T

April 26, 2024 EX-99.1

Argos North America Corp. and Subsidiaries Consolidated and Combined Financial Statements As of and for the years ended December 31, 2023, 2022, and 2021 INDEX TO FINANCIAL STATEMENTS

Exhibit 99.1 Argos North America Corp. and Subsidiaries Consolidated and Combined Financial Statements As of and for the years ended December 31, 2023, 2022, and 2021 INDEX TO FINANCIAL STATEMENTS Consolidated and combined financial statements Independent Auditors’ Report 2 Consolidated and combined statements of operations for the years ended December 31, 2023, 2022, and 2021 4 Consolidated and c

April 26, 2024 8-K

Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): April 26, 2024 Summit Materials, Inc. (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 (State or Other Jurisdiction of Incorporation) (Commission F

April 8, 2024 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.  )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.  ) Filed by the Registrant ☒ Filed by a Party other than the Registrant  ☐ Check the appropriate box:  ☐ Preliminary Proxy Statement  ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ D

April 8, 2024 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.  )

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.  ) Filed by the Registrant ☒ Filed by a Party other than the Registrant  ☐ Check the appropriate box:  ☐ Preliminary Proxy Statement  ☐ Confidential, for Use of the Commission Only (as permitted by Rul

March 13, 2024 8-K

Regulation FD Disclosure

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): March 13, 2024 Summit Materials, Inc. (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 (State or Other Jurisdiction of Incorporation) (Commission F

February 15, 2024 EX-21

Subsidiaries of Summit Materials, LLC and Summit Materials, Inc.

Exhibit 21 SUBSIDIARIES OF SUMMIT MATERIALS, INC. SUBSIDIARIES OF SUMMIT MATERIALS, LLC (as of February 15, 2024) Name Jurisdiction of Incorporation or Organization Alan Ritchey Materials Company, L.C. Oklahoma Alleyton Resource Company, LLC Delaware Alleyton Services Company, LLC Delaware American Materials Company, LLC North Carolina AMI Associates, LC Utah Argos North America Corp. Delaware Arg

February 15, 2024 EX-99.1

Summit Materials, LLC’s Consolidated Financial Statements and Notes to Consolidated Financial Statements.

Exhibit 99.1 Report of Independent Registered Public Accounting Firm To the Members and Board of Directors Summit Materials, LLC: Opinion on the Consolidated Financial Statements We have audited the accompanying consolidated balance sheets of Summit Materials, LLC and subsidiaries (the Company) as of December 30, 2023 and December 31, 2022, the related consolidated statements of operations, compre

February 15, 2024 EX-95.1

Mine Safety Disclosures.

Exhibit 95.1 Mine Safety Disclosures The operation of Summit Materials, Inc.’s and its subsidiaries’ (collectively, the “Company’s”) domestic aggregates quarries and mines are subject to regulation by the federal Mine Safety and Health Administration (“MSHA”) under the Federal Mine Safety and Health Act of 1977 (the “Mine Act”). MSHA inspects the Company’s quarries and mines on a regular basis and

February 15, 2024 EX-97.1

Incentive Compensation Clawback Policy

Exhibit 97.1 SUMMIT MATERIALS, INC. Incentive Compensation Clawback Policy (As Adopted on November 13, 2023 Pursuant to NYSE Rule 303A.14) 1.Overview. The Human Capital and Compensation Committee (the “Committee”) of the Board of Directors (the “Board”) of Summit Materials, Inc. (the “Company”) has adopted this Incentive Compensation Clawback Policy (the “Policy”) which requires the recoupment of

February 15, 2024 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One)

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 30, 2023 OR ☐TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file numbers: 001-368

February 15, 2024 EX-4.1

Description of Securities of Summit Materials, Inc.

Exhibit 4.1 DESCRIPTION OF REGISTRANT’S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 The following is a brief description of the Class A common stock, par value $0.01 per shares (the “Class A common stock”) of Summit Materials, Inc. (the “Company”) which is the only security of the Company registered pursuant to Section 12 of the Securities Exchange Act of 19

February 14, 2024 EX-99.2

Summit Materials, Inc. Preliminary Pro Forma Condensed Combined Balance Sheet as of 2023 Fiscal Year End

Exhibit 99.2 UNAUDITED PRELIMINARY PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION In January 2024, Summit Materials, Inc. (the “Company” or “Summit Inc.”) completed a merger with Argos North America Corp. ("Argos USA"), Cementos Argos S.A. (“Cementos Argos”), Argos SEM LLC and Valle Cement Investments, Inc., pursuant to which Summit acquired all of the outstanding equity interests (the "Transa

February 14, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): February 14, 2024 Summit Materials, Inc. (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 (State or Other Jurisdiction (Commission (I.R.S. Employe

February 14, 2024 EX-99.1

Summit Materials, Inc. Reports Fourth Quarter and Full Year 2023 Results Establishes Annual Summit Records for Revenue and Profitability Record Annual Organic Pricing Growth for Aggregates and Cement

Exhibit 99.1 Summit Materials, Inc. Reports Fourth Quarter and Full Year 2023 Results Establishes Annual Summit Records for Revenue and Profitability Record Annual Organic Pricing Growth for Aggregates and Cement DENVER, CO. - (February 14, 2024) - Summit Materials, Inc. (NYSE: SUM) (“Summit,” “Summit Materials,” “Summit Inc.” or the “Company”), market-leading producer of aggregates and cement com

February 13, 2024 SC 13G/A

SUM / Summit Materials, Inc. / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 9)* Name of issuer: Summit Materials, Inc. Class A Title of Class of Securities: Common Stock CUSIP Number: 86614U100 Date of Event Which Requires Filing of this Statement: December 29, 2023 Check the appropriate box to designate the rule pursuant to which this Schedule

February 12, 2024 EX-10.1

Restrictive Covenant Agreement, dated as of January 12, 2024, by and among Grupo Argos S.A., Cementos Argos S.A. and Summit Materials, Inc.

Exhibit 10.1 RESTRICTIVE COVENANT AGREEMENT This RESTRICTIVE COVENANT AGREEMENT (this “Agreement”) dated as of January 12, 2024 is by and between Grupo Argos S.A., a sociedad anónima incorporated in the Republic of Colombia (“Grupo”), Cementos Argos S.A., a sociedad anónima incorporated in the Republic of Colombia (“Cementos”), and Summit Materials, Inc., a Delaware corporation (“Summit”). Capital

February 12, 2024 EX-10.4

Cement Supply Agreement, dated as of January 12, 2024, by and between Zona Franca Argos S.A.S. and Argos USA LLC.

Exhibit 10.4 Cement Supply Agreement This Cement Supply Agreement (the “Agreement”), dated as of January 12, 2024 (the “Effective Date”), is entered into by and between ZONA FRANCA ARGOS S.A.S., a sociedad por acciones simplificadas organized and existing under the laws of the Republic of Colombia (hereinafter referred to as the “Seller”), and ARGOS USA LLC, a Delaware limited liability company (h

February 12, 2024 EX-99.1

Independent Auditors’ Report

Exhibit 99.1 Independent Auditors’ Report To the Stockholders and Board of Directors Argos North America Corp.: Opinion We have audited the consolidated and combined financial statements of Argos North America Corp. and its subsidiaries (the Company), which comprise the consolidated and combined balance sheets as of December 31, 2022 and 2021, and the related consolidated and combined statements o

February 12, 2024 EX-99.2

Argos North America Corp. Unaudited consolidated and combined statements of operations (In millions)

Exhibit 99.2 Argos North America Corp. Unaudited consolidated and combined statements of operations (In millions) For the three months ended September 30, For the nine months ended September 30, 2023 2022 2023 2022 Revenues $435.5 $413.5 $1,296.2 $1,189.3 Cost of goods sold 330.5 341.0 1,030.5 1,017.8 Gross profit 105.0 72.5 265.7 171.5 Operating expenses: Selling, general and administrative expen

February 12, 2024 EX-10.5

Intellectual Property License Agreement, dated as of January 12, 2024, by and among Cementos Argos S.A., Summit Materials, Inc. and Argos North America Corp.

Exhibit 10.5 EXECUTION VERSION INTELLECTUAL PROPERTY LICENSE AGREEMENT This INTELLECTUAL PROPERTY LICENSE AGREEMENT (this “Agreement”) is made and entered into as of as of January 12, 2024 (the “Effective Date”), by and between, on the one hand, Cementos Argos S.A., sociedad anónima incorporated in the Republic of Colombia (“Cementos Argos”), and, on the other hand, Summit Materials, Inc., a Delaw

February 12, 2024 EX-10.3

Support Services Agreement, dated as of January 12, 2024, by and between Summa Servicios Corporativos Integrales S.A.S. and Summit Materials, Inc.

Exhibit 10.3 SUPPORT SERVICES AGREEMENT by and between SUMMA SERVICIOS CORPORATIVOS INTEGRALES S.A.S. and SUMMIT MATERIALS, INC. Dated as of January 12, 2024 TABLE OF CONTENTS Article I DEFINITIONS Section 1.1. General 1 Section 1.2. Reference; Interpretation 4 Article II SERVICES Section 2.1. Services 4 Section 2.2. Standard of Service 5 Section 2.3. Additional Services 5 Section 2.4. Program Man

February 12, 2024 EX-10.6

Logistics Service Agreement (Cartagena), dated as of January 12, 2024, by and between Transatlantic Cement Carriers Inc. and Argos USA LLC.

Exhibit 10.6 LOGISTICS SERVICE AGREEMENT This LOGISTICS SERVICE AGREEMENT (this “Agreement”) is entered into as of January 12, 2024 (the “Effective Date”), by and between TRANSATLANTIC CEMENT CARRIERS INC., a corporation organized under the laws of Panama (“TACC”), and ARGOS USA LLC, a Delaware limited liability company (“Argos USA”), and together with TACC, referred to as the “Parties”. WHEREAS,

February 12, 2024 EX-10.7

International Logistics Service Agreement, dated as of January 12, 2024, by and between Transatlantic Cement Carriers Inc. and Argos USA LLC.

Exhibit 10.7 INTERNATIONAL LOGISTICS SERVICE AGREEMENT This INTERNATIONAL LOGISTICS SERVICE AGREEMENT (this “Agreement”) is entered into as of January 12, 2024 (the “Effective Date”), by and between TRANSATLANTIC CEMENT CARRIERS INC., a corporation organized under the laws of Panama (the “Agent”), and ARGOS USA LLC, a Delaware limited liability company (“Argos USA”), and together with the Agent, r

February 12, 2024 EX-10.8

Master Purchase Agreement, dated as of January 12, 2024, by and between Argos USA LLC and CI Del Mar Caribe (BVI) Inc.

Exhibit 10.8 MASTER PURCHASE AGREEMENT This PURCHASE AGREEMENT (this “Agreement”) is entered into as of January 12, 2024 (the “Effective Date”), by and between ARGOS USA LLC, a Delaware limited liability company (the “Buyer”), and CI DEL MAR CARIBE (BVI) INC., a company organized under the Laws of the British Virgin Islands (the “Agent”), and together with Buyer, referred to as the “Parties”. WHER

February 12, 2024 EX-10.2

Transition Services Agreement, dated as of January 12, 2024, by and between Cementos Argos S.A. and Summit Materials, Inc.

Exhibit 10.2 TRANSITION SERVICES AGREEMENT by and between CEMENTOS ARGOS S.A. and SUMMIT MATERIALS, INC. Dated as of January 12, 2024 TABLE OF CONTENTS Article I DEFINITIONS Section 1.1. General 1 Section 1.2. Reference; Interpretation 5 Article II SERVICES Section 2.1. Services 5 Section 2.2. Standard of Service 5 Section 2.3. Additional Services 5 Section 2.4. Program Managers 5 Section 2.5. Tra

February 12, 2024 8-K/A

Entry into a Material Definitive Agreement, Financial Statements and Exhibits

CIK 0001571371 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K/A CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): January 12, 2024 Summit Materials, Inc. Summit Materials, LLC (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 Delaware 333-18755

February 12, 2024 EX-99.3

UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION

Exhibit 99.3 UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION The following unaudited pro forma condensed combined financial statements (the “pro forma financial statements”) are derived from the historical audited and unaudited financial statements of Summit Materials, Inc. (“Summit” or the “Company”) and Argos North America Corp. (“Argos USA”) and its subsidiaries. The historical fin

February 9, 2024 SC 13G

SUM / Summit Materials, Inc. / MASSACHUSETTS FINANCIAL SERVICES CO /MA/ - SEC SCHEDULE 13G Passive Investment

SC 13G 1 SEC13GFiling.htm SEC SCHEDULE 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* SUMMIT MATERIALS, INC. (Name of Issuer) Common Stock (Title of Class of Securities) 86614U100 (CUSIP Number) December 29, 2023 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to

February 9, 2024 SC 13G/A

SUM / Summit Materials, Inc. / Capital International Investors - SEC SCHEDULE 13G Passive Investment

SC 13G/A 1 SEC13GFiling.htm SEC SCHEDULE 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 2 )* Summit Materials, Inc. (Name of Issuer) Common Stock (Title of Class of Securities) 86614U100 (CUSIP Number) December 29, 2023 (Date of Event Which Requires Filing of this Statement) Check the appropriate box

February 9, 2024 SC 13G/A

SUM / Summit Materials, Inc. / DIMENSIONAL FUND ADVISORS LP - SEC SCHEDULE 13G Passive Investment

SC 13G/A 1 SEC13GFiling.htm SEC SCHEDULE 13G 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) Common Stock (Title of Class of Securities) 86614U100 (CUSIP Number) December 29, 2023 (Date of Event Which Requires Filing of this Statement) Check the appropriate box t

January 22, 2024 EX-99.1

JOINT FILING AGREEMENT

EX-99.1 2 d698854dex991.htm EX-99.1 Exhibit 99.1 JOINT FILING AGREEMENT In accordance with Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as amended, each of the undersigned Reporting Persons hereby agrees to the joint filing, along with all other such Reporting Persons, on behalf of each of them of a statement on Schedule 13D (including amendments thereto) with respect to the Class A

January 22, 2024 SC 13D

SUM / Summit Materials, Inc. / Argos SEM, LLC - SC 13D Activist Investment

SC 13D 1 d698854dsc13d.htm SC 13D UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 SUMMIT MATERIALS, INC. (Name of Issuer) Class A Common Stock (par value $0.01 per share) (Title of Class of Securities) 86614U100 (CUSIP Number) GRUPO ARGOS S.A. Carrera 43A # 1A Sur - 143 Edificio Santillana, Torre Sur Medellín, Colombia,

January 12, 2024 EX-10.2

Stockholder Agreement, dated as of January 12, 2024, by and among Summit Materials, Inc., Cementos Argos S.A., Argos SEM, LLC and Valle Cement Investments, Inc. and, solely for the purpose of specified sections of the Stockholder Agreement, Grupo Argos S.A.

Exhibit 10.2 STOCKHOLDER AGREEMENT by and among CEMENTOS ARGOS S/A, ARGOS SEM, LLC, VALLE CEMENT INVESTMENTS, INC., SUMMIT MATERIALS, INC., and solely for the limited purposes of Sections 1.1, 1.2, 2.1, 2.2, 4.1, 4.5(j), 4.5(k), 4.5(l), 4.5(m), 4.6, 4.7 and ArticleS V and VI, GRUPO ARGOS S.A. DATED AS OF JANUARY 12, 2024 TABLE OF CONTENTS Page Article I DEFINITIONS Section 1.1 Definitions 1 Sectio

January 12, 2024 EX-10.4

Form of Indemnification Agreement

Exhibit 10.4 INDEMNIFICATION AGREEMENT This Indemnification Agreement is effective as of January 12, 2024, (this “Agreement”) and is between Summit Materials, Inc., a Delaware corporation (the “Company”), and the undersigned director of the Company (the “Indemnitee”). Background The Company believes that, in order to attract and retain highly competent persons to serve as directors, it must provid

January 12, 2024 EX-10.1

Registration Rights Agreement, dated as of January 12, 2024, by and among Summit Materials, Inc., Cementos Argos S.A., Argos SEM, LLC and Valle Cement Investments, Inc.

Exhibit 10.1 REGISTRATION RIGHTS AGREEMENT This Registration Rights Agreement (as amended, restated, supplemented or otherwise modified from time to time, this “Agreement”) is dated as of January 12, 2024, and is among Summit Materials, Inc., a Delaware corporation (the “Company”), Cementos, the other Argos Parties (each as defined below) and the other holders of Registrable Securities (as defined

January 12, 2024 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Entry into a Material Definitive Agreement, Material Modification to Rights of Security Holders, Unregistered Sales of Equity Securities, Financial Statements and Exhibits, Completion of Acquisition or Disposition of Assets, Other Events

CIK: 0001571371 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): January 12, 2024 Summit Materials, Inc. Summit Materials, LLC (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 Delaware 333-187556

January 12, 2024 EX-10.3

Amendment No. 7, dated as of January 12, 2024, to the Amended and Restated Credit Agreement, dated as of July 17, 2015 (as amended by Amendment No. 1, dated as of January 19, 2017, Amendment No. 2, dated as of November 21, 2017, Amendment No. 3, dated as of May 22, 2018, Amendment No. 4, dated as of February 25, 2019, Amendment No. 5, dated as of December 14, 2022 and Amendment No. 6 dated as of January 10, 2023), among Summit Materials, LLC, as the borrower, the guarantors party thereto, the several banks and other financial institutions or entities party thereto, Bank of America, N.A., as administrative agent, collateral agent, L/C issuer and swing line lender and the other parties thereto.

Exhibit 10.3 Execution Version AMENDMENT No. 7, dated as of January 12, 2024 (this “Amendment”), among SUMMIT MATERIALS, LLC, a Delaware limited liability company (the “Borrower”), the Guarantors party hereto, the Term B-2 Lender party hereto, the Amendment No. 7 Incremental Revolving Lenders party hereto, the other Lenders party hereto and BANK OF AMERICA, N.A., as Administrative Agent (the “Admi

January 12, 2024 EX-3.1

Certificate of Designation, dated as of January 12, 2024

Exhibit 3.1 CERTIFICATE OF DESIGNATIONS OF THE VOTING SERIES A NON-CONVERTIBLE PREFERRED STOCK OF SUMMIT MATERIALS, INC. Summit Materials, Inc., a Delaware corporation (the “Corporation”), in accordance with the provisions of Sections 141 and 151 of the General Corporation Law of the State of Delaware, does hereby certify that: WHEREAS, the Restated Certificate of Incorporation of the Corporation

January 12, 2024 EX-99.1

Summit Materials Completes Combination with Argos USA Transaction Creates Unrivaled, Materials Dominant, Platform with National Scale

Exhibit 99.1 Summit Materials Completes Combination with Argos USA Transaction Creates Unrivaled, Materials Dominant, Platform with National Scale DENVER (January 12, 2024) — Summit Materials, Inc. (NYSE: SUM, “Summit” or the “Company”) announced today that it has successfully completed its $3.2 billion combination with Argos North America Corp. (“Argos USA,” the U.S. operations of Cementos Argos

January 11, 2024 EX-99.1

Summit Materials Shareholders Approve Combination with Argos USA

Exhibit 99.1 Summit Materials Shareholders Approve Combination with Argos USA DENVER (January 11, 2024) — Summit Materials, Inc. (NYSE: SUM, “Summit” or the “Company”) announced today that its shareholders have voted overwhelmingly to approve certain proposals related to the Transaction Agreement, dated September 7, 2023 (the “Transaction Agreement”) by and among the Company, Argos North America C

January 11, 2024 8-K

Financial Statements and Exhibits, Other Events, Submission of Matters to a Vote of Security Holders

CIK: 0001571371 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): January 11, 2024 Summit Materials, Inc. Summit Materials, LLC (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 Delaware 333-187556

December 28, 2023 8-K

Other Events

CIK 0001571371 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): December 28, 2023 Summit Materials, Inc. Summit Materials, LLC (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 Delaware 333-187556

December 14, 2023 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): December 14, 2023 Summit Materials, Inc. Summit Materials, LLC (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 Delaware 333-187556 26-4138486 (Sta

December 14, 2023 EX-4.1

Indenture, dated as of December 14, 2023, by and among Summit Materials, LLC, Summit Materials Finance Corp., the subsidiary guarantors named on the signature pages thereto and Wilmington Trust, National Association, as trustee.

Exhibit 4.1     INDENTURE   Dated as of December 14, 2023   Among   SUMMIT MATERIALS, LLC, as the Issuer,   SUMMIT MATERIALS FINANCE CORP., as the Co-Issuer,   the Guarantors named herein   and   WILMINGTON TRUST, NATIONAL ASSOCIATION,   as Trustee, Transfer Agent, Registrar and Paying Agent   $800,000,000 7.250% SENIOR NOTES DUE 2031         TABLE OF CONTENTS         Page         ARTICLE 1     de

December 12, 2023 DEFM14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒ Filed by a party other than the Registrant  ☐ Check the appropriate box:  ☐  ☐ Preliminary Proxy Statement  ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

December 1, 2023 8-K

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): November 30, 2023 Summit Materials, Inc. Summit Materials, LLC (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 Delaware 333-187556 26-4138486 (Sta

November 29, 2023 PRER14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. 2)

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934   (Amendment No. 2) Filed by the Registrant ☒ Filed by a party other than the Registrant  ☐ Check the appropriate box:  ☐ ☒ Preliminary Proxy Statement  ☐ Confidential, for Use of the Commission Only (as permitted by

November 29, 2023 CORRESP

Evan Rosen

Evan Rosen +1 212 450 4505 [email protected] Davis Polk & Wardwell LLP 450 Lexington Avenue New York, NY 10017 davispolk.com November 29, 2023 Re: Summit Materials, Inc. Revised Preliminary Proxy Statement on Schedule 14A Filed November 13, 2023 File No. 001-36873 U.S. Securities and Exchange Commission Division of Corporation Finance Office of Energy & Transportation 100 F Street, N.E. Was

November 27, 2023 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): November 27, 2023 Summit Materials, Inc. Summit Materials, LLC (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 Delaware 333-187556 26-4138486 (Sta

November 27, 2023 EX-99.2

Summary Historical Consolidated Financial and Other Data of Summit LLC and Subsidiaries

Exhibit 99.2 Summary Historical Consolidated Financial and Other Data of Summit LLC and Subsidiaries The following tables set forth, for the periods and as of the dates indicated, our summary historical consolidated financial and other data. The summary historical consolidated financial information as of and for the nine months ended September 30, 2023 and October 1, 2022 was derived from Summit L

November 27, 2023 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant x Filed by a party other than the Registrant ¨ Check the appropriate box: ¨ Preliminary Proxy Statement ¨ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ¨ Defin

November 27, 2023 EX-99.1

Summit Materials Announces intention to offer $800 million of senior notes

Exhibit 99.1 Summit Materials Announces intention to offer $800 million of senior notes DENVER-(PR NEWSWIRE)-Summit Materials, Inc. (NYSE: SUM, “Summit”) announced today that its indirect subsidiaries Summit Materials, LLC and Summit Materials Finance Corp. (the “Issuers”, and, together with Summit, the “Company”) intend to offer $800.0 million aggregate principal amount of Senior Notes due 2031 (

November 13, 2023 CORRESP

Evan Rosen

Evan Rosen +1 212 450 4505 [email protected] Davis Polk & Wardwell llp 450 Lexington Avenue New York, NY 10017 davispolk.com November 13, 2023 Re: Summit Materials, Inc. Proxy Statement on Schedule 14A Filed October 19, 2023 File No. 001-36973 U.S. Securities and Exchange Commission Division of Corporation Finance Office of Energy & Transportation 100 F Street, N.E. Washington, D.C. 20549 A

November 13, 2023 PRER14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. 1)

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934   (Amendment No. 1) Filed by the Registrant ☒ Filed by a party other than the Registrant  ☐ Check the appropriate box:  ☐ ☒ Preliminary Proxy Statement  ☐ Confidential, for Use of the Commission Only (as permitted by

November 3, 2023 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.    )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.    ) Filed by the Registrant ☒ Filed by a party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ De

November 2, 2023 EX-10.1

Assignment Agreement, dated as of August 18, 2023, by and among Summit Materials, Inc. and each of the other persons party thereto.

Exhibit 10.1 ASSIGNMENT AGREEMENT This ASSIGNMENT AGREEMENT (this “Agreement”), dated as of August 18, 2023 (the “Effective Date”), is made and entered into by and among Blackstone Participation Partnership (Delaware) V-NQ L.P., a Delaware limited partnership, Blackstone Family Investment Partnership (Delaware) V-NQ L.P., a Delaware limited partnership, Blackstone Capital Partners (Delaware) V-NQ

November 2, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2023 ☐ TRANSITION REPO

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file numbers: 001-36873 (Sum

November 2, 2023 EX-95.1

Mine Safety Disclosures

Exhibit 95.1 Mine Safety Disclosures The operation of Summit Materials, Inc.’s and its subsidiaries’ (collectively, the “Company’s”) domestic aggregates quarries and mines are subject to regulation by the federal Mine Safety and Health Administration (“MSHA”) under the Federal Mine Safety and Health Act of 1977 (the “Mine Act”). MSHA inspects the Company’s quarries and mines on a regular basis and

November 2, 2023 EX-99.1

Summit Materials, LLC’s Unaudited Consolidated Financial Statements and Notes to Unaudited Consolidated Financial Statements.

Exhibit 99.1 SUMMIT MATERIALS, LLC AND SUBSIDIARIES Consolidated Balance Sheets (In thousands) September 30, December 31, 2023 2022 (unaudited) (audited) Assets Current assets: Cash and cash equivalents $ 192,996 $ 520,451 Accounts receivable, net 375,929 256,669 Costs and estimated earnings in excess of billings 40,985 6,510 Inventories 243,136 212,491 Other current assets 17,976 20,787 Current a

November 2, 2023 EX-10.2

Amendment, dated as of September 28, 2023, to the Transition and Consulting Agreement, dated as of September 8, 2022, by and among Summit Materials, Inc. and Brian J. Harris.

Exhibit 10.2 [***] Portions of this exhibit have been redacted in compliance with Regulation S-K Item 601(a)(6) Summit Materials, Inc. 1801 California Street, Suite 3500 Denver, CO 80202 September 28, 2023 Brian J. Harris [***] Re: Amendment to Transition and Consulting Agreement Dear Brian, Reference is made to that certain transition and consulting agreement (the “Agreement”), dated as of Septem

November 1, 2023 EX-99.1

Summit Materials, Inc. Reports Third Quarter 2023 Results Establishes Summit Records for Revenue and Profitability Sets Elevate Summit highs for ROIC and Adjusted EBITDA Margin Raises 2023 Guidance

Exhibit 99.1 Summit Materials, Inc. Reports Third Quarter 2023 Results Establishes Summit Records for Revenue and Profitability Sets Elevate Summit highs for ROIC and Adjusted EBITDA Margin Raises 2023 Guidance DENVER, CO. - (November 1, 2023) - Summit Materials, Inc. (NYSE: SUM) (“Summit,” “Summit Materials,” "Summit Inc." or the “Company”), a leading vertically integrated construction materials

November 1, 2023 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): November 1, 2023 Summit Materials, Inc. (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 (State or Other Jurisdiction (Commission (I.R.S. Employer

October 24, 2023 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.       )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.       ) Filed by the Registrant ☒ Filed by a party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐

October 20, 2023 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a party other than the Registrant ☐ Check the appropriate box: ☐ ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Def

October 19, 2023 EX-FILING FEES

Calculation of Filing Fee Tables SCHEDULE 14A (Form Type) Summit Materials, Inc. (Name of Registrant as Specified in its Charter) Table 1: Transaction Valuation

Exhibit 107 Calculation of Filing Fee Tables SCHEDULE 14A (Form Type) Summit Materials, Inc.

October 19, 2023 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a party other than the Registrant  ☐ Check the appropriate box:  ☐ ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))   ☐

October 19, 2023 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a party other than the Registrant  ☐ Check the appropriate box:  ☐ ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))   ☐

October 19, 2023 PREM14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934   (Amendment No. ) Filed by the Registrant ☒ Filed by a party other than the Registrant  ☐ Check the appropriate box:  ☐ ☒ Preliminary Proxy Statement  ☐ Confidential, for Use of the Commission Only (as permitted by

September 13, 2023 EX-2.2

Form of Stockholder Agreement, among Summit Materials, Inc., Cementos Argos S.A., Argos SEM, LLC, Valle Cement Investments, Inc., and Grupo Argos S.A. (for the limited purposes set forth therein).

Exhibit 2.2 EXHIBIT A STOCKHOLDER AGREEMENT by and among CEMENTOS ARGOS S/A, ARGOS SEM, LLC, VALLE CEMENT INVESTMENTS, INC., SUMMIT MATERIALS, INC., and solely for the limited purposes of Sections 1.1, 1.2, 2.1, 2.2, 4.1, 4.5(j), 4.5(k), 4.5(l), 4.5(m), 4.6, 4.7 and ArticleS V and VI, GRUPO ARGOS S.A. DATED AS OF [●] TABLE OF CONTENTS Page Article I DEFINITIONS Section 1.1 Definitions 1 Section 1.

September 13, 2023 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): September 13, 2023 (September 7,

CIK 0001571371 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): September 13, 2023 (September 7, 2023) Summit Materials, Inc. Summit Materials, LLC (Exact name of registrant as specified in its charter) Delaware 001-36873 47-198421

September 13, 2023 EX-2.2

Form of Stockholder Agreement, among Summit Materials, Inc., Cementos Argos S.A., Argos SEM, LLC, Valle Cement Investments, Inc., and Grupo Argos S.A. (for the limited purposes set forth therein).

Exhibit 2.2 EXHIBIT A STOCKHOLDER AGREEMENT by and among CEMENTOS ARGOS S/A, ARGOS SEM, LLC, VALLE CEMENT INVESTMENTS, INC., SUMMIT MATERIALS, INC., and solely for the limited purposes of Sections 1.1, 1.2, 2.1, 2.2, 4.1, 4.5(j), 4.5(k), 4.5(l), 4.5(m), 4.6, 4.7 and ArticleS V and VI, GRUPO ARGOS S.A. DATED AS OF [●] TABLE OF CONTENTS Page Article I DEFINITIONS Section 1.1 Definitions 1 Section 1.

September 13, 2023 8-K

Entry into a Material Definitive Agreement, Material Modification to Rights of Security Holders, Unregistered Sales of Equity Securities, Financial Statements and Exhibits

CIK 0001571371 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): September 13, 2023 (September 7, 2023) Summit Materials, Inc. Summit Materials, LLC (Exact name of registrant as specified in its charter) Delaware 001-36873 47-198421

September 8, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): September 8, 2023 (September 7,

CIK 0001571371 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): September 8, 2023 (September 7, 2023) Summit Materials, Inc. Summit Materials, LLC (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212

September 8, 2023 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): September 8, 2023 (September 7,

CIK 0001571371 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): September 8, 2023 (September 7, 2023) Summit Materials, Inc. Summit Materials, LLC (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212

September 8, 2023 EX-2.1

Transaction Agreement, dated September 7, 2023, among Summit Materials, Inc., Argos North America, Corp., Cementos Argos S.A., Argos SEM LLC, Valle Cement Investments, Inc.

Exhibit 2.1 Execution Version TRANSACTION AGREEMENT dated as of September 7, 2023 by and among SUMMIT MATERIALS, INC., ARGOS NORTH AMERICA CORP., CEMENTOS ARGOS S.A., ARGOS SEM, LLC, and VALLE CEMENT INVESTMENTS, INC. TABLE OF CONTENTS Article 1 Definitions Section 1.01. Definitions 2 Section 1.02. Other Definitional and Interpretative Provisions 26 Article 2 Purchase and Sale Section 2.01. Purcha

September 8, 2023 EX-2.1

Transaction Agreement, dated September 7, 2023, among Summit Materials, Inc., Argos North America, Corp., Cementos Argos S.A., Argos SEM LLC, Valle Cement Investments, Inc.

Exhibit 2.1 Execution Version TRANSACTION AGREEMENT dated as of September 7, 2023 by and among SUMMIT MATERIALS, INC., ARGOS NORTH AMERICA CORP., CEMENTOS ARGOS S.A., ARGOS SEM, LLC, and VALLE CEMENT INVESTMENTS, INC. TABLE OF CONTENTS Article 1 Definitions Section 1.01. Definitions 2 Section 1.02. Other Definitional and Interpretative Provisions 26 Article 2 Purchase and Sale Section 2.01. Purcha

September 7, 2023 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Other Events

CIK 0001571371 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): September 7, 2023 Summit Materials, Inc. Summit Materials, LLC (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 Delaware 333-187556

September 7, 2023 EX-99.1

Press Release of Summit Materials, Inc. dated September 7, 2023.

Exhibit 99.1 Summit Materials to Combine with Argos USA, Creating a Materials-Led Enterprise with National Scale Accelerates ‘Elevate Summit’ by Creating Premier Enterprise with ~$1 billion Combined EBITDA Including $100 Million of Synergies Expands Summit’s Cement Footprint in Rapidly Growing, Year-Round Markets with Reduced Seasonality Enhances Scale and Ability to Meet Demand in Increasingly Ca

September 7, 2023 EX-99.2

Summit Materials to Combine with Argos USA Creating a Materials - Led Enterprise with National Scale September 7, 2023

Exhibit 99.2 Summit Materials to Combine with Argos USA Creating a Materials - Led Enterprise with National Scale September 7, 2023 Forward Looking Statements 2 These materials include “forward - looking statements” within the meaning of the federal securities laws, which involve risks and uncertainties . Forward - looking statements include all statements that do not relate solely to historical o

September 7, 2023 EX-99.1

Summit Materials to Combine with Argos USA, Creating a Materials-Led Enterprise with National Scale Accelerates ‘Elevate Summit’ by Creating Premier Enterprise with ~$1 billion Combined EBITDA Including $100 Million of Synergies Expands Summit’s Ceme

Exhibit 99.1 Summit Materials to Combine with Argos USA, Creating a Materials-Led Enterprise with National Scale Accelerates ‘Elevate Summit’ by Creating Premier Enterprise with ~$1 billion Combined EBITDA Including $100 Million of Synergies Expands Summit’s Cement Footprint in Rapidly Growing, Year-Round Markets with Reduced Seasonality Enhances Scale and Ability to Meet Demand in Increasingly Ca

September 7, 2023 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Definitive Proxy State

September 7, 2023 EX-99.2

Investor Presentation.

Exhibit 99.2 Summit Materials to Combine with Argos USA Creating a Materials - Led Enterprise with National Scale September 7, 2023 Forward Looking Statements 2 These materials include “forward - looking statements” within the meaning of the federal securities laws, which involve risks and uncertainties . Forward - looking statements include all statements that do not relate solely to historical o

September 7, 2023 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): September 7, 2023 Summit Materia

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): September 7, 2023 Summit Materials, Inc. Summit Materials, LLC (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 Delaware 333-187556 26-4138486 (St

August 22, 2023 EX-99.1

Summit Materials Announces Significant Step to Streamline Company Structure

Summit Materials Announces Significant Step to Streamline Company Structure DENVER, CO.

August 22, 2023 8-K

Regulation FD Disclosure, Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): August 18, 2023 Summit Materials, Inc. Summit Materials, LLC (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 Delaware 333-187556 26-4138486 (Stat

August 3, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended July 1, 2023 ☐ TRANSITION REPORT PUR

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended July 1, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file numbers: 001-36873 (Summit Ma

August 3, 2023 EX-95.1

Mine Safety Disclosures

Exhibit 95.1 Mine Safety Disclosures The operation of Summit Materials, Inc.’s and its subsidiaries’ (collectively, the “Company’s”) domestic aggregates quarries and mines are subject to regulation by the federal Mine Safety and Health Administration (“MSHA”) under the Federal Mine Safety and Health Act of 1977 (the “Mine Act”). MSHA inspects the Company’s quarries and mines on a regular basis and

August 3, 2023 EX-10.1

Amendment No. 1 to Tax Receivable Agreement, dated as of May 10, 2023, by and among Summit Materials, Inc. and each of the other persons party thereto.

Exhibit 10.1 AMENDMENT NO. 1 TO TAX RECEIVABLE AGREEMENT AMENDMENT NO. 1 TO TAX RECEIVABLE AGREEMENT (this “Amendment”), dated as of May 10, 2023, by and among Summit Materials, Inc., a Delaware corporation (including any successor corporation, the “Corporate Taxpayer”) and the TRA Parties listed on the signature pages hereto (the “Consenting TRA Parties”). RECITALS: WHEREAS, reference is hereby m

August 3, 2023 EX-99.1

Summit Materials, LLC’s Unaudited Consolidated Financial Statements and Notes to Unaudited Consolidated Financial Statements.

Exhibit 99.1 SUMMIT MATERIALS, LLC AND SUBSIDIARIES Consolidated Balance Sheets (In thousands) July 1, December 31, 2023 2022 (unaudited) (audited) Assets Current assets: Cash and cash equivalents $ 230,010 $ 520,451 Accounts receivable, net 370,504 256,669 Costs and estimated earnings in excess of billings 35,315 6,510 Inventories 246,275 212,491 Other current assets 22,336 20,787 Current assets

August 2, 2023 EX-99.1

Summit Materials, Inc. Reports Second Quarter 2023 Results Second Quarter Records established for Revenue and Profitability Achieved Elevate Summit target for ROIC Raises 2023 Guidance

Exhibit 99.1 Summit Materials, Inc. Reports Second Quarter 2023 Results Second Quarter Records established for Revenue and Profitability Achieved Elevate Summit target for ROIC Raises 2023 Guidance DENVER, CO. - (August 2, 2023) - Summit Materials, Inc. (NYSE: SUM) (“Summit,” “Summit Materials,” "Summit Inc." or the “Company”), a leading vertically integrated construction materials company, today

August 2, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): August 2, 2023 Summit Materials,

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): August 2, 2023 Summit Materials, Inc. (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 (State or Other Jurisdiction (Commission (I.R.S. Employer o

June 23, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): June 21, 2023 Summit Materials,

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): June 21, 2023 Summit Materials, Inc. Summit Materials, LLC (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 Delaware 333-187556 26-4138486 (State

May 25, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): May 25, 2023 Summit Materials, I

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): May 25, 2023 Summit Materials, Inc. (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 (State or Other Jurisdiction (Commission (I.R.S. Employer of

May 4, 2023 EX-10.3

Amendment to Participation Notice and Agreement under Summit Materials, Inc. Executive Severance Plan, dated as of March 1, 2023, by and between Summit Materials, Inc. and Anne P. Noonan.

EX-10.3 3 ex10310q12023.htm EX-10.3 Exhibit 10.3 SUMMIT MATERIALS, INC. EXECUTIVE SEVERANCE PLAN Amendment to Participation Notice and Agreement Date: March 1, 2023 Participant: Anne P. Noonan Reference is made herein to my Participation Notice and Agreement (the “Agreement”), dated as of July 20, 2020, under the Summit Materials, Inc. Executive Severance Plan (as amended from time to time, the “P

May 4, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended April 1, 2023 ☐ TRANSITION REPORT PU

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended April 1, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file numbers: 001-36873 (Summit M

May 4, 2023 EX-10.2

Participation Notice and Agreement under Summit Materials, Inc. Executive Severance Plan by and between Summit Materials, Inc. and Scott Anderson.

Exhibit 10.2 Exhibit A SUMMIT MATERIALS, INC. EXECUTIVE SEVERANCE PLAN Participation Notice and Agreement Participant: C. Scott Anderson Qualifying Termination / Qualifying Change in Control Termination Severance Multiple: 2x Welfare Continuation Period: 24 months Severance Payment Period: 24 months I hereby agree to the terms and conditions of the Summit Materials, Inc. Executive Severance Plan (

May 4, 2023 EX-99.1

Summit Materials, LLC’s Unaudited Consolidated Financial Statements and Notes to Unaudited Consolidated Financial Statements.

Exhibit 99.1 SUMMIT MATERIALS, LLC AND SUBSIDIARIES Consolidated Balance Sheets (In thousands) April 1, December 31, 2023 2022 (unaudited) (audited) Assets Current assets: Cash and cash equivalents $ 379,457 $ 520,451 Accounts receivable, net 236,569 256,669 Costs and estimated earnings in excess of billings 14,387 6,510 Inventories 234,564 212,491 Other current assets 24,608 20,787 Current assets

May 4, 2023 EX-95.1

Mine Safety Disclosures

Exhibit 95.1 Mine Safety Disclosures The operation of Summit Materials, Inc.’s and its subsidiaries’ (collectively, the “Company’s”) domestic aggregates quarries and mines are subject to regulation by the federal Mine Safety and Health Administration (“MSHA”) under the Federal Mine Safety and Health Act of 1977 (the “Mine Act”). MSHA inspects the Company’s quarries and mines on a regular basis and

May 3, 2023 EX-99.1

Summit Materials, Inc. Reports First Quarter 2023 Results Record First Quarter Net Revenue Record Quarterly Aggregates Pricing Growth Raises 2023 Adjusted EBITDA Guidance

Exhibit 99.1 Summit Materials, Inc. Reports First Quarter 2023 Results Record First Quarter Net Revenue Record Quarterly Aggregates Pricing Growth Raises 2023 Adjusted EBITDA Guidance DENVER, CO. - (May 3, 2023) - Summit Materials, Inc. (NYSE: SUM) (“Summit,” “Summit Materials,” "Summit Inc." or the “Company”), a leading vertically integrated construction materials company, today announced results

May 3, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): May 3, 2023 Summit Materials, In

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): May 3, 2023 Summit Materials, Inc. (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 (State or Other Jurisdiction (Commission (I.R.S. Employer of I

April 10, 2023 SC 13G/A

SUM / Summit Materials Inc - Class A / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 8)* Name of issuer: Summit Materials Inc. Class A Title of Class of Securities: Common Stock CUSIP Number: 86614U100 Date of Event Which Requires Filing of this Statement: March 31, 2023 Check the appropriate box to designate the rule pursuant to which this Schedule is f

April 10, 2023 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.  )

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.  ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 1

April 10, 2023 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant x Filed by a Party other than the Registrant ¨ Check the appropriate box: ¨ Preliminary Proxy Statement ¨ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ¨ Defin

March 1, 2023 EX-99.1

Summit Materials Announces Scott Anderson as New Chief Financial Officer

Summit Materials Announces Scott Anderson as New Chief Financial Officer DENVER, CO.

March 1, 2023 EX-10.1

Offer Letter between Summit Materials, Inc. and Scott Anderson

February 23, 2023 Dear Scott, Summit Materials, LLC (“Summit Materials” or the “Company”) is pleased to offer you a promotion on our team! The details of your offer are as follows: Position Title: Executive Vice President and Chief Financial Officer, Summit Materials Reporting To: Anne Noonan, President & Chief Executive Officer, Summit Materials Location: Relocation to Denver, CO – timing to be mutually agreed Start Date: Timing to be mutually agreed Annual Base Salary: $566,800 Annual Cash Bonus Target: You are eligible to receive a performance-based bonus target of 75% of your base salary.

March 1, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): March 1, 2023 Summit Materials,

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): March 1, 2023 Summit Materials, Inc. (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 (State or Other Jurisdiction (Commission (I.R.S. Employer of

February 16, 2023 EX-21.1

Subsidiaries of Summit Materials, LLC and Summit Materials, Inc.

Exhibit 21 SUBSIDIARIES OF SUMMIT MATERIALS, INC. SUBSIDIARIES OF SUMMIT MATERIALS, LLC (as of February 16, 2023) Name Jurisdiction of Incorporation or Organization Alan Ritchey Materials Company, L.C. Oklahoma Alleyton Resource Company, LLC Delaware Alleyton Services Company, LLC Delaware American Materials Company, LLC North Carolina AMI Associates, LC Utah Asphalt Materials, LLC Utah Austin Mat

February 16, 2023 EX-4.1

Description of Registrant's Securities

Exhibit 4.1 DESCRIPTION OF REGISTRANT’S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 The following is a brief description of the Class A common stock, par value $0.01 per shares (the “Class A common stock”) of Summit Materials, Inc. (the “Company”) which is the only security of the Company registered pursuant to Section 12 of the Securities Exchange Act of 19

February 16, 2023 EX-10.44

Offer Letter between Summit Materials, Inc. and Kekin Ghelani

Exhibit 10.44 February 27, 2022 Kekin Ghelani Sent via email: Dear Kekin, Summit Materials, LLC (“Summit Materials” or the “Company”) is pleased to offer you a position on our team! The details of your offer are as follows: Position Title: Chief Strategy & Growth Officer, Summit Materials Reporting to: Anne Noonan, President & Chief Executive Officer, Summit Materials Location: Remote from Dallas,

February 16, 2023 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One)

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022 OR ☐TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file numbers: 001-368

February 16, 2023 EX-99.1

Summit Materials, LLC’s Consolidated Financial Statements and Notes to Consolidated Financial Statements.

Exhibit 99.1 Report of Independent Registered Public Accounting Firm To the Members and Board of Directors Summit Materials, LLC: Opinion on the Consolidated Financial Statements We have audited the accompanying consolidated balance sheets of Summit Materials, LLC and subsidiaries (the Company) as of December 31, 2022 and January 1, 2022, the related consolidated statements of operations, comprehe

February 16, 2023 EX-95.1

Mine Safety Disclosures.

Exhibit 95.1 Mine Safety Disclosures The operation of Summit Materials, Inc.’s and its subsidiaries’ (collectively, the “Company’s”) domestic aggregates quarries and mines are subject to regulation by the federal Mine Safety and Health Administration (“MSHA”) under the Federal Mine Safety and Health Act of 1977 (the “Mine Act”). MSHA inspects the Company’s quarries and mines on a regular basis and

February 15, 2023 EX-99.1

Summit Materials, Inc. Reports Fourth Quarter and Full Year 2022 Results Record Safety Performance Record Annual Organic Pricing Growth for All Lines of Business Record Annual Operating Income

Exhibit 99.1 Summit Materials, Inc. Reports Fourth Quarter and Full Year 2022 Results Record Safety Performance Record Annual Organic Pricing Growth for All Lines of Business Record Annual Operating Income DENVER, CO. - (February 15, 2023) - Summit Materials, Inc. (NYSE: SUM) (“Summit,” “Summit Materials,” "Summit Inc." or the “Company”), a leading vertically integrated construction materials comp

February 15, 2023 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): February 15, 2023 Summit Materials, Inc. (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 (State or Other Jurisdiction (Commission (I.R.S. Employe

February 13, 2023 SC 13G/A

SUM / Summit Materials Inc / Capital International Investors - SEC SCHEDULE 13G Passive Investment

SC 13G/A 1 SEC13GFiling.htm SEC SCHEDULE 13G 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) Common Stock (Title of Class of Securities) 86614U100 (CUSIP Number) December 30, 2022 (Date of Event Which Requires Filing of this Statement) Check the appropriate box

February 10, 2023 SC 13G

SUM / Summit Materials Inc / DIMENSIONAL FUND ADVISORS LP - SEC SCHEDULE 13G Passive Investment

SC 13G 1 SEC13GFiling.htm SEC SCHEDULE 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* Summit Materials Inc (Name of Issuer) Common Stock (Title of Class of Securities) 86614U100 (CUSIP Number) December 30, 2022 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to de

February 9, 2023 SC 13G/A

SUM / Summit Materials Inc / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SC 13G/A 1 tv01983-summitmaterialsinccl.htm SCHEDULE 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 7)* Name of issuer: Summit Materials Inc. Class A Title of Class of Securities: Common Stock CUSIP Number: 86614U100 Date of Event Which Requires Filing of this Statement: December 30, 2022 Check the appropriate

January 10, 2023 EX-10.1

Amendment No. 6, dated as of January 10, 2023, to the Amended and Restated Credit Agreement, dated as of July 17, 2015 (as amended by Amendment No. 1, dated as of January 19, 2017, Amendment No. 2, dated as of November 21, 2017, Amendment No. 3, dated as of May 22, 2018, Amendment No. 4, dated as of February 25, 2019 and Amendment No. 5, dated as of December 14, 2022), among Summit Materials, LLC, as the borrower, the guarantors party thereto, the several banks and other financial institutions or entities from time to time party thereto, Bank of America, N.A., as administrative agent, collateral agent, L/C issuer and swing line lender and the other parties thereto.

Exhibit 10.1 Execution Version AMENDMENT No. 6, dated as of January 10, 2023 (this “Amendment”), to the Amended and Restated Credit Agreement dated as of July 17, 2015, among SUMMIT MATERIALS, LLC, a Delaware limited liability company (the “Borrower”), the Guarantors party thereto, the several banks and other financial institutions or entities from time to time parties to the Credit Agreement (the

January 10, 2023 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): January 10, 2023 Summit Materials, Inc. Summit Materials, LLC (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 Delaware 333-187556 26-4138486 (Stat

January 6, 2023 S-3ASR

As filed with the Securities and Exchange Commission on January 6, 2023.

As filed with the Securities and Exchange Commission on January 6, 2023. Registration No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-3 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Summit Materials, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware (State or other jurisdiction of incorporation or organization) 47-1984212 (I.R.S.

January 6, 2023 EX-FILING FEES

Filing fee table.

Exhibit 107.1 Calculation of Filing Fee Tables Form S-3 (Form Type) Summit Materials, Inc. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Fo

December 14, 2022 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): December 14, 2022 Summit Materials, Inc. Summit Materials, LLC (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 Delaware 333-187556 26-4138486 (Sta

December 14, 2022 EX-10.1

Amendment No. 5, dated as of December 14, 2022, to the Amended and Restated Credit Agreement, dated as of July 17, 2015 (as amended by Amendment No. 1, dated as of January 19, 2017, Amendment No. 2, dated as of November 21, 2017, Amendment No. 3, dated as of May 22, 2018 and Amendment No. 4, dated as of February 25, 2019), among Summit Materials, LLC, as the borrower, the guarantors party thereto, the several banks and other financial institutions or entities from time to time party thereto, Bank of America, N.A., as administrative agent, collateral agent, L/C issuer and swing line lender and the other parties thereto.

Exhibit 10.1 Execution Version AMENDMENT No. 5, dated as of December 14, 2022 (this ?Amendment?), to the Amended and Restated Credit Agreement dated as of July 17, 2015, among SUMMIT MATERIALS, LLC, a Delaware limited liability company (the ?Borrower?), the Guarantors party thereto, the several banks and other financial institutions or entities from time to time parties to the Credit Agreement (th

December 5, 2022 EX-99.1

Summit Materials, Inc. Declares Special Stock Dividend

Summit Materials, Inc. Declares Special Stock Dividend DENVER, CO. - (December 5, 2022) - Summit Materials, Inc. (NYSE: SUM) (?Summit,? ?Summit Materials,? "Summit Inc." or the ?Company?), a leading vertically integrated construction materials company, today announced that it has declared a special stock dividend of 0.017 shares of the Company?s Class A common stock, par value $0.01 per share (?Cl

December 5, 2022 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): December 5, 2022 Summit Materials, Inc. Summit Materials, LLC (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 Delaware 333-187556 24-4138486 (Sta

November 21, 2022 8-K

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): November 16, 2022 Summit Materials, Inc. (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 (State or Other Jurisdiction (Commission (I.R.S. Employe

November 21, 2022 EX-3.1

Third Amended and Restated By-Laws of Summit Materials, Inc. (incorporated by reference to Exhibit 3.1 to Summit Materials, Inc.’s Current Report on Form 8-K filed on November 21, 2022 (File No. 001-36873)).

THIRD AMENDED AND RESTATED BYLAWS OF SUMMIT MATERIALS, INC. ARTICLE I. Offices Section 1. Registered Office. The registered office and registered agent of Summit Materials, Inc. (the ?Corporation?) in the State of Delaware shall be as set forth in the Corporation?s certificate of incorporation as then in effect (as the same may be amended and/or restated from time to time, the ?Restated Certificat

November 16, 2022 EX-10.1

Offer Letter between Summit Materials, Inc. and Karli Anderson (incorporated by reference to Summit Materials, Inc.’s Current Report on Form 8-K filed on November 16, 2022 (File No. 001-46783)).

November 15, 2022 Ms. Karli Anderson c/o Summit Materials, Inc. 1801 California Street Suite 3500 Denver, CO 80202 Dear Karli, I am pleased to offer you the position of Executive Vice President, Chief People, Environmental, Social and Governance Officer and Head of Communications of Summit Materials, LLC (?Summit Materials? or ?Company?), reporting directly to me, President and Chief Executive Off

November 16, 2022 EX-99.1

Summit Materials, Inc. Announces Senior Leadership Change  Karli Anderson assumes expanded leadership role to include oversight of Summit Materials’ human resources and communications functions

Summit Materials, Inc. Announces Senior Leadership Change? Karli Anderson assumes expanded leadership role to include oversight of Summit Materials? human resources and communications functions DENVER, CO. - (November 16, 2022) - Summit Materials, Inc. (NYSE: SUM) (?Summit,? ?Summit Materials,? "Summit Inc." or the ?Company?), a leading vertically integrated construction materials company, announc

November 16, 2022 8-K

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): November 15, 2022 Summit Materials, Inc. (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 (State or Other Jurisdiction (Commission (I.R.S. Employe

November 14, 2022 8-K

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): November 14, 2022 Summit Materials, Inc. (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 (State or Other Jurisdiction (Commission (I.R.S. Employe

November 3, 2022 EX-95.1

Mine Safety Disclosures

Exhibit 95.1 Mine Safety Disclosures The operation of Summit Materials, Inc.?s and its subsidiaries? (collectively, the ?Company?s?) domestic aggregates quarries and mines are subject to regulation by the federal Mine Safety and Health Administration (?MSHA?) under the Federal Mine Safety and Health Act of 1977 (the ?Mine Act?). MSHA inspects the Company?s quarries and mines on a regular basis and

November 3, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended October 1, 2022 ☐ TRANSITION REPORT

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended October 1, 2022 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file numbers: 001-36873 (Summit

November 3, 2022 EX-99.1

Summit Materials, LLC’s Unaudited Consolidated Financial Statements and Notes to Unaudited Consolidated Financial Statements.

Exhibit 99.1 SUMMIT MATERIALS, LLC AND SUBSIDIARIES Consolidated Balance Sheets (In thousands) October 1, January 1, 2022 2022 (unaudited) (audited) Assets Current assets: Cash and cash equivalents $ 437,299 $ 380,961 Accounts receivable, net 363,956 287,226 Costs and estimated earnings in excess of billings 33,568 7,600 Inventories 202,783 180,760 Other current assets 20,132 11,827 Current assets

November 2, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): November 2, 2022 Summit Materials, Inc. (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 (State or Other Jurisdiction (Commission (I.R.S. Employer

November 2, 2022 EX-99.1

Summit Materials, Inc. Reports Third Quarter 2022 Results Announces Acquisition of SCI Materials Record Organic Pricing Growth for Aggregates, Cement, and Ready-mix Record Adjusted Diluted Net Income Strongest Balance Sheet in Company History

EX-99.1 2 a8kexhibit991-q32022.htm EX-99.1 Exhibit 99.1 Summit Materials, Inc. Reports Third Quarter 2022 Results Announces Acquisition of SCI Materials Record Organic Pricing Growth for Aggregates, Cement, and Ready-mix Record Adjusted Diluted Net Income Strongest Balance Sheet in Company History DENVER, CO. - (November 2, 2022) - Summit Materials, Inc. (NYSE: SUM) (“Summit,” “Summit Materials,”

September 12, 2022 EX-99.1

Summit Materials, Inc. Announces Senior Leadership Change After a planned transition, CFO Brian Harris will assume a non-executive role DENVER, CO. - (September 12, 2022) - Summit Materials, Inc. (NYSE: SUM) (“Summit,” “Summit Materials,” "Summit Inc

Summit Materials, Inc. Announces Senior Leadership Change After a planned transition, CFO Brian Harris will assume a non-executive role DENVER, CO. - (September 12, 2022) - Summit Materials, Inc. (NYSE: SUM) (?Summit,? ?Summit Materials,? "Summit Inc." or the ?Company?), a leading vertically integrated construction materials company, announced today that Brian J. Harris, Executive Vice President a

September 12, 2022 EX-10.1

Transition and Consulting Agreement by and among Summit Materials, Inc. and Brian J. Harris dated as of September 8, 2022 (incorporated by reference to Exhibit 10.1 to Summit Materials, Inc.'s Current Report on Form 8-K filed on September 12, 2022 (File No. 001-36783)).

1 TRANSITION AND CONSULTING AGREEMENT This Transition and Consulting Agreement (this ?Agreement?) is made this 8th day of September, 2022 (the ?Effective Date?) by and among Summit Materials, Inc.

September 12, 2022 8-K

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): September 8, 2022 Summit Materials, Inc. (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 (State or Other Jurisdiction (Commission (I.R.S. Employe

August 4, 2022 EX-95.1

Mine Safety Disclosures

Exhibit 95.1 Mine Safety Disclosures The operation of Summit Materials, Inc.?s and its subsidiaries? (collectively, the ?Company?s?) domestic aggregates quarries and mines are subject to regulation by the federal Mine Safety and Health Administration (?MSHA?) under the Federal Mine Safety and Health Act of 1977 (the ?Mine Act?). MSHA inspects the Company?s quarries and mines on a regular basis and

August 4, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended July 2, 2022 ☐ TRANSITION REPORT PUR

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended July 2, 2022 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file numbers: 001-36873 (Summit Ma

August 4, 2022 EX-99.1

Summit Materials, LLC’s Unaudited Consolidated Financial Statements and Notes to Unaudited Consolidated Financial Statements.

Exhibit 99.1 SUMMIT MATERIALS, LLC AND SUBSIDIARIES Consolidated Balance Sheets (In thousands) July 2, January 1, 2022 2022 (unaudited) (audited) Assets Current assets: Cash and cash equivalents $ 465,315 $ 380,961 Accounts receivable, net 327,266 287,226 Costs and estimated earnings in excess of billings 37,813 7,600 Inventories 209,875 180,760 Other current assets 14,393 11,827 Current assets he

August 3, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): August 3, 2022 Summit Materials, Inc. (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 (State or Other Jurisdiction (Commission (I.R.S. Employer o

August 3, 2022 EX-99.1

Summit Materials, Inc. Reports Second Quarter 2022 Results Record Quarterly Net Income Strongest Balance Sheet in Company History Net Leverage Ratio remains below Elevate Summit target

Exhibit 99.1 Summit Materials, Inc. Reports Second Quarter 2022 Results Record Quarterly Net Income Strongest Balance Sheet in Company History Net Leverage Ratio remains below Elevate Summit target DENVER, CO. - (August 3, 2022) - Summit Materials, Inc. (NYSE: SUM) (?Summit,? ?Summit Materials,? "Summit Inc." or the ?Company?), a leading vertically integrated construction materials company, today

July 12, 2022 CORRESP

* * *

1550 Wynkoop Street, 3rd Fl Denver, Colorado 80202 (303) 893-0012 Office (303) 893-6993 Fax summit-materials.

May 24, 2022 EX-99.1

Exhibit 99.1 Summit Materials, Inc. Provides Update on Its Elevate Strategy 3 of 4 Horizon One targets achieved in year after strategy launch Over $470 million in proceeds generated from divestitures Reiterates and Provides Additional Details on its

Exhibit 99.1 Summit Materials, Inc. Provides Update on Its Elevate Strategy 3 of 4 Horizon One targets achieved in year after strategy launch Over $470 million in proceeds generated from divestitures Reiterates and Provides Additional Details on its Path to Horizon Three Targeted Returns and Margins DENVER, CO. - (May 24, 2022) - Summit Materials, Inc. (NYSE: SUM) (?Summit,? ?Summit Materials,? "S

May 24, 2022 EX-99.2

2022 SUMMIT MATERIALS INVESTOR DAY May 24, 2022 Forward Looking Statements This presentation includes “forward-looking statements” within the meaning of the federal securities laws, which involve risks and uncertainties. Forward-looking statements in

exhibit992 2022 SUMMIT MATERIALS INVESTOR DAY May 24, 2022 Forward Looking Statements This presentation includes “forward-looking statements” within the meaning of the federal securities laws, which involve risks and uncertainties.

May 24, 2022 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): May 24, 2022 Summit Materials, Inc. (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 (State or Other Jurisdiction (Commission (I.R.S. Employer of

May 18, 2022 8-K

Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): May 18, 2022 Summit Materials, Inc. (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 (State or Other Jurisdiction (Commission (I.R.S. Employer of

May 16, 2022 EX-99.1

SUMMIT MATERIALS ANNOUNCES DIVESTITURE OF HINKLE CONTRACTING TO CRH AMERICAS MATERIALS DENVER, May 16, 2022--Summit Materials, Inc. (NYSE: SUM) ("Summit," “Summit Materials,” “Summit, Inc.” or the "Company"), a leading vertically integrated construct

SUMMIT MATERIALS ANNOUNCES DIVESTITURE OF HINKLE CONTRACTING TO CRH AMERICAS MATERIALS DENVER, May 16, 2022-Summit Materials, Inc.

May 16, 2022 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): May 13, 2022 Summit Materials, Inc. Summit Materials, LLC (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 Delaware 333-187556 26-4138486 (State o

May 5, 2022 EX-99.1

Summit Materials, LLC’s Unaudited Consolidated Financial Statements and Notes to Unaudited Consolidated Financial Statements.

Exhibit 99.1 SUMMIT MATERIALS, LLC AND SUBSIDIARIES Consolidated Balance Sheets (In thousands) April 2, January 1, 2022 2022 (unaudited) (audited) Assets Current assets: Cash and cash equivalents $ 287,392 $ 380,961 Accounts receivable, net 239,839 287,226 Costs and estimated earnings in excess of billings 12,723 7,600 Inventories 187,009 180,760 Other current assets 14,305 11,827 Current assets h

May 5, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended April 2, 2022 ☐ TRANSITION REPORT PU

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended April 2, 2022 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file numbers: 001-36873 (Summit M

May 5, 2022 EX-95.1

Mine Safety Disclosures

Exhibit 95.1 Mine Safety Disclosures The operation of Summit Materials, Inc.?s and its subsidiaries? (collectively, the ?Company?s?) domestic aggregates quarries and mines are subject to regulation by the federal Mine Safety and Health Administration (?MSHA?) under the Federal Mine Safety and Health Act of 1977 (the ?Mine Act?). MSHA inspects the Company?s quarries and mines on a regular basis and

May 4, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): May 4, 2022 Summit Materials, Inc. (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 (State or Other Jurisdiction (Commission (I.R.S. Employer of I

May 4, 2022 EX-99.1

Summit Materials, Inc. Reports First Quarter 2022 Results Strong pricing and demand conditions continue Results in line with expectations Net Leverage Ratio remains below Elevate Summit target

Exhibit 99.1 Summit Materials, Inc. Reports First Quarter 2022 Results Strong pricing and demand conditions continue Results in line with expectations Net Leverage Ratio remains below Elevate Summit target DENVER, CO. - (May 4, 2022) - Summit Materials, Inc. (NYSE: SUM) (?Summit,? ?Summit Materials,? "Summit Inc." or the ?Company?), a leading vertically integrated construction materials company, t

April 1, 2022 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.  )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.??) Filed by the Registrant?x Filed by a Party other than the Registrant?? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Defi

April 1, 2022 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.  )

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ? SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.??) ? Filed by the Registrant?? Filed by a Party other than the Registrant?? Check the appropriate box: ? Preliminary Proxy Statement ? ? Confidential, for Use of the Commission Only (as permitted by

March 2, 2022 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): March 2, 2022 Summit Materials, Inc. (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 (State or Other Jurisdiction (Commission (I.R.S. Employer of

March 2, 2022 EX-99.1

1 Summit Materials, Inc. Announces Stock Repurchase Program Board authorizes repurchase of up to $250 million of Summit’s Class A common stock Complements Summit’s M&A program Reflects Summit’s Commitment to Sound Capital Allocation DENVER, CO. - (Ma

1 Summit Materials, Inc. Announces Stock Repurchase Program Board authorizes repurchase of up to $250 million of Summit?s Class A common stock Complements Summit?s M&A program Reflects Summit?s Commitment to Sound Capital Allocation DENVER, CO. - (March 2, 2022) - Summit Materials, Inc. (NYSE: SUM) (?Summit,? ?Summit Materials,? "Summit Inc." or the ?Company?), a leading vertically integrated cons

February 24, 2022 EX-4.1

Description of Registrant's Securities

DESCRIPTION OF REGISTRANT?S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 The following is a brief description of the Class A common stock, par value $0.

February 24, 2022 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One)

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ?ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended January 1, 2022 OR ?TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file numbers: 001-36873

February 24, 2022 EX-21

Subsidiaries of Summit Materials, LLC and Summit Materials, Inc.

Exhibit 21 SUBSIDIARIES OF SUMMIT MATERIALS, INC. SUBSIDIARIES OF SUMMIT MATERIALS, LLC (as of February 24, 2022) Name Jurisdiction of Incorporation or Organization Alan Ritchey Materials Company, L.C. Oklahoma Alleyton Resource Company, LLC Delaware Alleyton Services Company, LLC Delaware American Materials Company, LLC North Carolina Austin Materials, LLC Delaware B&B Resources, Inc. Utah Bourbo

February 24, 2022 EX-95.1

Mine Safety Disclosures.

Exhibit 95.1 Mine Safety Disclosures The operation of Summit Materials, Inc.?s and its subsidiaries? (collectively, the ?Company?s?) domestic aggregates quarries and mines are subject to regulation by the federal Mine Safety and Health Administration (?MSHA?) under the Federal Mine Safety and Health Act of 1977 (the ?Mine Act?). MSHA inspects the Company?s quarries and mines on a regular basis and

February 24, 2022 EX-99.1

Summit Materials, LLC’s Consolidated Financial Statements and Notes to Consolidated Financial Statements.

Exhibit 99.1 Report of Independent Registered Public Accounting Firm To the Members and Board of Directors Summit Materials, LLC: Opinion on the Consolidated Financial Statements We have audited the accompanying consolidated balance sheets of Summit Materials, LLC and subsidiaries (the Company) as of January 1, 2022 and January 2, 2021, the related consolidated statements of operations, comprehens

February 23, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): February 23, 2022 Summit Materials, Inc. (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 (State or Other Jurisdiction (Commission (I.R.S. Employe

February 23, 2022 EX-99.1

Summit Materials, Inc. Reports Fourth Quarter and Full Year 2021 Results Record Full Year 2021 Net Revenue of $2.2 billion, an increase of 4.6% Record Full Year 2021 Net income attributable to Summit Inc. of $152.2 million, an increase of 10.3% Recor

Exhibit 99.1 Summit Materials, Inc. Reports Fourth Quarter and Full Year 2021 Results Record Full Year 2021 Net Revenue of $2.2 billion, an increase of 4.6% Record Full Year 2021 Net income attributable to Summit Inc. of $152.2 million, an increase of 10.3% Record Full Year 2021 Adjusted EBITDA of $520.1 million, an increase of 7.8% Net Leverage ratio improved to an all-time low DENVER, CO. - (Feb

February 11, 2022 SC 13G

SUM / Summit Materials Inc / Capital International Investors - SEC SCHEDULE 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* Summit Materials, Inc. (Name of Issuer) Common Stock (Title of Class of Securities) 86614U100 (CUSIP Number) December 31, 2021 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this S

February 10, 2022 SC 13G/A

SUM / Summit Materials Inc / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 6)* Name of issuer: Summit Materials Inc. Class A Title of Class of Securities: Common Stock CUSIP Number: 86614U100 Date of Event Which Requires Filing of this Statement: December 31, 2021 Check the appropriate box to designate the rule pursuant to which this Schedule i

February 8, 2022 SC 13G/A

SUM / Summit Materials Inc / DIMENSIONAL FUND ADVISORS LP - SEC SCHEDULE 13G Passive Investment

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) Common Stock (Title of Class of Securities) 86614U100 (CUSIP Number) December 31, 2021 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this S

November 4, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended October 2, 2021 ☐ TRANSITION REPORT

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended October 2, 2021 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file numbers: 001-36873 (Summit

November 4, 2021 EX-99.1

Summit Materials, LLC’s Unaudited Consolidated Financial Statements and Notes to Unaudited Consolidated Financial Statements.

Exhibit 99.1 SUMMIT MATERIALS, LLC AND SUBSIDIARIES Consolidated Balance Sheets (In thousands) October 2, January 2, 2021 2021 (unaudited) (audited) Assets Current assets: Cash and cash equivalents $ 258,083 $ 418,181 Accounts receivable, net 333,351 254,696 Costs and estimated earnings in excess of billings 34,181 8,666 Inventories 195,312 200,308 Other current assets 13,855 11,428 Total current

November 4, 2021 EX-95.1

Mine Safety Disclosures

EX-95.1 10 exhibit95110q32021.htm EX-95.1 Exhibit 95.1 Mine Safety Disclosures The operation of Summit Materials, Inc.’s and its subsidiaries’ (collectively, the “Company’s”) domestic aggregates quarries and mines are subject to regulation by the federal Mine Safety and Health Administration (“MSHA”) under the Federal Mine Safety and Health Act of 1977 (the “Mine Act”). MSHA inspects the Company’s

November 3, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): November 3, 2021 Summit Materials, Inc. (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 (State or Other Jurisdiction (Commission (I.R.S. Employer

November 3, 2021 EX-99.1

Summit Materials, Inc. Reports Third Quarter 2021 Results - Third Quarter Net Revenue of $662.3 million, an increase of 2.6% -Net income attributable to Summit Inc. of $74.2 million -Third Quarter Adjusted EBITDA of $190.3 million -Aggregates volumes

Exhibit 99.1 Summit Materials, Inc. Reports Third Quarter 2021 Results - Third Quarter Net Revenue of $662.3 million, an increase of 2.6% -Net income attributable to Summit Inc. of $74.2 million -Third Quarter Adjusted EBITDA of $190.3 million -Aggregates volumes increased 9.2% -Cement volumes increased 2.0% DENVER, CO. - (November 3, 2021) - Summit Materials, Inc. (NYSE: SUM, ?Summit,? ?Summit Ma

September 27, 2021 8-K

Termination of a Material Definitive Agreement

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): September 27, 2021 Summit Materials, Inc. Summit Materials, LLC (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 Delaware 333-187556 26-4138486 (S

September 7, 2021 8-K

Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): September 7, 2021 Summit Materials, Inc. Summit Materials, LLC (Exact name of registrant as specified in its charter) Delaware 001-36873 47-1984212 Delaware 333-187556 26-4138486 (St

August 5, 2021 S-8

As filed with the Securities and Exchange Commission on August 5, 2021.

As filed with the Securities and Exchange Commission on August 5, 2021. Registration No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-8 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Summit Materials, Inc. (Exact name of registrant as specified in its charter) Delaware 47-1984212 (State or other jurisdiction of incorporation or organization) (I.R.S.

August 5, 2021 EX-99.1

Summit Materials, LLC’s Unaudited Consolidated Financial Statements and Notes to Unaudited Consolidated Financial Statements.

Exhibit 99.1 SUMMIT MATERIALS, LLC AND SUBSIDIARIES Consolidated Balance Sheets (In thousands) July 3, January 2, 2021 2021 (unaudited) (audited) Assets Current assets: Cash and cash equivalents $ 469,097 $ 418,181 Accounts receivable, net 316,615 254,696 Costs and estimated earnings in excess of billings 28,717 8,666 Inventories 198,217 200,308 Other current assets 15,271 11,428 Total current ass

August 5, 2021 EX-10.3

Omnibus Amendment to Participation Notice and Agreements Under the Summit Materials, Inc. Executive Severance Plan

Exhibit 10.3 OMNIBUS AMENDMENT TO PARTICIPATION NOTICE AND AGREEMENTS UNDER THE SUMMIT MATERIALS, INC. EXECUTIVE SEVERANCE PLAN THIS OMNIBUS AMENDMENT (this ?Omnibus Amendment?), dated as of May 18, 2021, amends each Participation Notice and Agreement under the Summit Materials, Inc. Executive Severance Plan (as such plan may be amended and/or restated from time to time, the ?Severance Plan?) that

August 5, 2021 EX-95.1

Mine Safety Disclosures

Exhibit 95.1 Mine Safety Disclosures The operation of Summit Materials, Inc.?s and its subsidiaries? (collectively, the ?Company?s?) domestic aggregates quarries and mines are subject to regulation by the federal Mine Safety and Health Administration (?MSHA?) under the Federal Mine Safety and Health Act of 1977 (the ?Mine Act?). MSHA inspects the Company?s quarries and mines on a regular basis and

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