Document:

EX-4.14

 Exhibit 4.14 

Execution Version 

FIRST SUPPLEMENTAL INDENTURE 

First Supplemental Indenture (this “Supplemental Indenture”), dated as of July 17, 2015, among Kilgore Partners, L.P., a
Utah limited partnership, and Lewis & Lewis, Inc., a Wyoming corporation (each, a “Guaranteeing Subsidiary” and collectively, the “Guaranteeing Subsidiaries”), each an indirect subsidiary of Summit
Materials, LLC, a Delaware limited liability company (the “Issuer”), and Wilmington Trust, National Association, a national banking association, as trustee (the “Trustee”), Transfer Agent, Registrar and Paying
Agent. 
 W I T N E S S E T H 

WHEREAS, the Issuer, Summit Materials Finance Corp., a Delaware corporation (together with the Issuer, the “Issuers”), and
the Guarantors have heretofore executed and delivered to the Trustee an Indenture (the “Indenture”), dated as of July 8, 2015, providing for the issuance of $350,000,000 aggregate principal amount of 6.125% Senior Notes due
2023 (the “Initial Notes”); 
 WHEREAS, the Indenture provides that under certain circumstances a Guaranteeing Subsidiary
shall execute and deliver to the Trustee a supplemental indenture pursuant to which such Guaranteeing Subsidiary shall unconditionally guarantee all of the Issuers’ Obligations under the Notes and the Indenture on the terms and conditions set
forth herein and under the Indenture (each, a “Guarantee”); and 
 WHEREAS, pursuant to Section 9.01 of the Indenture,
the Trustee is authorized to execute and deliver this Supplemental Indenture. 
 NOW THEREFORE, in consideration of the foregoing and for
other good and valuable consideration, the receipt of which is hereby acknowledged, the parties mutually covenant and agree for the equal and ratable benefit of the Holders as follows: 

(1) Capitalized Terms. Capitalized terms used herein without definition shall have the meanings assigned to them in the Indenture. 

(2) Agreement to Guarantee. Each Guaranteeing Subsidiary acknowledges that it has received and reviewed a copy of the Indenture and all
other documents it deems necessary to review in order to enter into this Supplemental Indenture, and acknowledges and agrees to (i) join and become a party to the Indenture as indicated by its signature below; (ii) be bound by the
Indenture, as of the date hereof, as if made by, and with respect to, each signatory hereto; and (iii) perform all obligations and duties required of a Guarantor pursuant to the Indenture. Each Guaranteeing Subsidiary hereby agrees to provide
an unconditional Guarantee on the terms and subject to the conditions set forth in the Indenture, including, but not limited to, Article 10 thereof. 

(3) Execution and Delivery. Each Guaranteeing Subsidiary agrees that its Guarantee shall remain in full force and effect notwithstanding
the absence of the endorsement of any notation of such Guarantee on the Notes. 
 (4) No Recourse Against Others. No past, present or
future director, officer, employee, incorporator, member, partner or stockholder of the Issuers or any Guaranteeing Subsidiary shall have any liability for any obligations of the Issuers or the Guarantors (including any Guaranteeing Subsidiary)
under the Notes, any Guarantees, the Indenture or this Supplemental Indenture or for any claim based on, in respect of, or by reason of, such obligations or their creation. Each Holder by accepting Notes waives and releases all such liability. The
waiver and release are part of the consideration for issuance of the Notes. 

 (5) Governing Law. THIS SUPPLEMENTAL INDENTURE, AND ANY CLAIM, CONTROVERSY OR DISPUTE
ARISING UNDER OR RELATED TO THIS SUPPLEMENTAL INDENTURE, WILL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK. 

(6) Counterparts. The parties may sign any number of copies of this Supplemental Indenture. Each signed copy shall be an original, but
all of them together represent the same agreement. This Supplemental Indenture may be executed in multiple counterparts which, when taken together, shall constitute one instrument. The exchange of copies of this Supplemental Indenture and of
signature pages by facsimile or PDF transmissions shall constitute effective execution and delivery of this Supplemental Indenture as to the parties hereto and may be used in lieu of the original Supplemental Indenture for all purposes. Signatures
of the parties hereto transmitted by facsimile or PDF shall be deemed to be their original signatures for all purposes. 
 (7) Effect of
Headings. The Section headings herein are for convenience only and shall not affect the construction hereof. 
 (8) The Trustee.
The Trustee shall not be responsible in any manner whatsoever for or in respect of the validity or sufficiency of this Supplemental Indenture or for or in respect of the recitals contained herein, all of which recitals are made solely by each
Guaranteeing Subsidiary. 
 (9) Benefits Acknowledged. Each Guaranteeing Subsidiary’s Guarantee is subject to the terms and
conditions set forth in the Indenture. Each Guaranteeing Subsidiary acknowledges that it will receive direct and indirect benefits from the financing arrangements contemplated by the Indenture and this Supplemental Indenture and that the guarantee
and waivers made by it pursuant to its Guarantee are knowingly made in contemplation of such benefits. 
 (10) Successors. All
agreements of each Guaranteeing Subsidiary in this Supplemental Indenture shall bind its Successors, except as otherwise provided in this Supplemental Indenture. All agreements of the Trustee in this Supplemental Indenture shall bind its successors.

 [Signatures on following page] 

 IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly
executed, all as of the date first above written. 
  

			
	KILGORE PARTNERS, L.P.
		
	By:	 	SUMMIT MATERIALS LLC, as general partner
		
	By:	 	 /s/ Anne Lee Benedict

		 	Name: Anne Lee Benedict
		 	Title: Chief Legal Officer
	
	LEWIS & LEWIS, INC.
		
	By:	 	 /s/ Anne Lee Benedict

		 	Name: Anne Lee Benedict
		 	Title: Secretary

 [Signature Page to First Supplemental Indenture] 

 
			
	WILMINGTON TRUST, NATIONAL ASSOCIATION, as Trustee
		
	By:	 	 /s/ Joseph O’Donnell

		 	Name: Joseph O’Donnell
		 	Title: Vice President

 [Signature Page to First Supplemental Indenture]EX-10.5

 Exhibit 10.5 

FORM OF AMENDMENT NO. 1 TO STOCKHOLDERS’ AGREEMENT 

This AMENDMENT NO. 1 TO STOCKHOLDERS’ AGREEMENT, dated as of [            ],
2015 (this “Amendment”), is entered into by and between Summit Materials, Inc., a Delaware corporation (the “Company”) and each of the other parties identified on the signature pages hereto (the “Investor
Parties”). This Amendment is an amendment to the Stockholders’ Agreement, dated as of March 11, 2015 (the “Agreement”) by and between the Company and the Investor Parties. 

RECITALS: 
 WHEREAS, the
Company and the Investor Parties desire to amend the Agreement with respect to the matters set forth herein. 
 NOW THEREFORE, in
consideration of the premises and agreements hereinafter set forth, the parties hereto hereby agree as follows: 

Section 1.    Amendments. The Agreement is hereby amended to amend and restate the definition of
“Outstanding Summit Interests” in its entirety to reach as follows: 
 “Outstanding Summit
Interests” means the aggregate number of votes all outstanding shares of Common Stock would at such time be entitled to vote generally in the election of Directors. For purposes of calculating any proportion of Outstanding Summit Interests,
the number of Outstanding Summit Interests held by any Person shall consist of the sum of (a) the number of shares of Class A Common Stock held by such Person and (b) the number of votes such Person is entitled to as a holder of Class
B Common Stock, assuming in each case that the LP Units held by such Person have been exchanged for Class A Common Stock in accordance with the Exchange Agreement. 

Section 2.    Status. This Amendment amends the Agreement, but only to the extent expressly set forth herein.
All other provisions of the Agreement remain in full force and effect. Unless otherwise defined herein, initially capitalized terms have the meaning given them in the Agreement. 

Section 3.    Governing Law. This Amendment shall be governed by and construed in accordance with the
applicable terms and provisions of Section 5.7 of the Agreement, which terms and provisions are incorporated herein by reference. 

Section 4.    Counterparts. This Amendment may be executed in one or more counterparts, each of which shall be
deemed to be an original, but all of which shall be considered one and the same instrument. 

Section 5.    Facsimile Execution. Facsimile signatures on counterparts of this Amendment are hereby
authorized and shall be acknowledged as if such facsimile signatures were an original execution, and this Amendment shall be deemed as executed when an executed facsimile hereof is transmitted by a party to any other party. 

[Remainder of Page Intentionally Left Blank] 

 IN WITNESS WHEREOF, each of the parties hereto has executed this Amendment as of the date first
written above. 
  

			
	COMPANY
	
	 SUMMIT MATERIALS, INC.

		
	 By:
	 	
		 	  

	 Name:

	 Title:

 
			
	INVESTOR PARTIES:
	
	 BLACKSTONE PARTICIPATION PARTNERSHIP (DELAWARE) V-NQ L.P.

		
	 By:
	 	BCP V-NQ GP L.L.C., its U.S. general partner
		
	 By:
	 	
		 	  

	 Name:

	 Title:

	
	BLACKSTONE FAMILY INVESTMENT PARTNERSHIP (DELAWARE) V-NQ L.P.
		
	 By:
	 	BCP V-NQ GP L.L.C., its U.S. general partner
		
	 By:
	 	
		 	  

	 Name:

	 Title:

	
	BLACKSTONE CAPITAL PARTNERS (DELAWARE) V-NQ L.P.
		
	 By:
	 	Blackstone Management Associates (Cayman) V-NQ L.P., its general partner
		
	 By:
	 	BCP V-NQ GP L.L.C., its U.S. general partner
		
	 By:
	 	
		 	  

	 Name:

	 Title:

			
	
	BLACKSTONE CAPITAL PARTNERS (DELAWARE) NQ V-AC L.P.
		
	 By:
	 	Blackstone Management Associates (Cayman) V-NQ L.P., its general partner
		
	 By:
	 	BCP V-NQ GP L.L.C., its U.S. general partner
		
	 By:
	 	
		 	  

	 Name:

	 Title:

	
	SUMMIT BCP INTERMEDIATE HOLDINGS L.P.
		
	 By:
	 	Summit BCP Intermediate Holdings GP, Ltd., its general partner
		
	 By:
	 	
		 	  

	 Name:

	 Title:

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