EX-4.3



 Exhibit 4.3 

FIRST SUPPLEMENTAL INDENTURE 

FIRST SUPPLEMENTAL INDENTURE (this “Supplemental Indenture”), dated as of September 30, 2016, among SemGroup Corporation, a Delaware
corporation (“SemGroup”), SemGas, L.P., SemMaterials, L.P., SemGroup Europe Holding, L.L.C., SemOperating G.P., L.L.C., SemMexico, L.L.C., SemDevelopment, L.L.C., Mid-America Midstream Gas Services, L.L.C. (the “Guaranteeing
Subsidiaries”), each an indirect wholly-owned subsidiary of SemGroup, Rose Rock Finance Corporation, a Delaware corporation (together with Rose Rock Midstream, L.P., the “Issuers”), the other Subsidiary Guarantors (as defined in the
Indenture referred to below) and Wilmington Trust, National Association, as trustee under the Indenture referred to below (the “Trustee”). 

W I T N E S S E T H 
 WHEREAS,
the Issuers have heretofore executed and delivered to the Trustee a senior unsecured indenture (the “Indenture”), dated as of May 14, 2015 providing for the issuance of 5.625% Senior Notes Due 2023 (the “Notes”); 

WHEREAS, Sections 801 and 802 of the Indenture provide that SemGroup (as the “Successor Company” under the Indenture) shall execute
and deliver to the Trustee a supplemental indenture pursuant to which SemGroup assumes the payment of the principal of and any premium and interest on the Notes and the performance or observance of every covenant of the Indenture on the part of the
Successor Company to be performed or observed; 
 WHEREAS, the Indenture provides that under certain circumstances the Guaranteeing
Subsidiaries shall execute and deliver to the Trustee a supplemental indenture pursuant to which the Guaranteeing Subsidiaries shall unconditionally guarantee all of the Issuers’ Obligations under the Notes and the Indenture on the terms and
conditions set forth herein (the “Subsidiary Guarantee”); and 
 WHEREAS, pursuant to Section 901 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 Guaranteeing Subsidiaries and the Trustee mutually covenant and agree for the equal and ratable benefit of the Holders of the Notes as follows: 

1. CAPITALIZED TERMS. Capitalized terms used herein without definition shall have the meanings assigned to them in the Indenture. 

2. AGREEMENT TO SUBSIDIARY GUARANTEE. The Guaranteeing Subsidiaries hereby agree to provide an unconditional Subsidiary Guarantee on the terms
and subject to the conditions set forth in the Subsidiary Guarantee and in the Indenture including but not limited to Article 12 thereof. 







 3. AGREEMENT TO ASSUME OBLIGATIONS. SemGroup, as “Successor Company” under
the Indenture, hereby assumes the principal of, and any premium and interest on, the Notes and the performance or observance of every covenant of the Indenture on the part of the “Company” under the Indenture to be performed or observed
and all other obligations of the “Company” under the Indenture and the Notes on the terms and subject to the conditions set forth in the Indenture. 

4. NO RECOURSE AGAINST OTHERS. No past, present or future director, officer, employee, incorporator, stockholder or agent of the Guaranteeing
Subsidiaries, as such, shall have any liability for any obligations of the Issuers or any Guaranteeing Subsidiary under the Notes, any Note 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; provided that the foregoing shall not limit any of the Issuers’ obligations under the Notes. Each Holder of the Notes by accepting a Note waives and releases all such liability. The waiver
and release are part of the consideration for issuance of the Notes. Such waiver may not be effective to waive liabilities under the federal securities laws and it is the view of the SEC that such a waiver is against public policy. 

5. GOVERNING LAW. THIS SUPPLEMENTAL INDENTURE SHALL 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. 
 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 the Guaranteeing Subsidiaries and the Issuers. 

[signatures on following pages] 

  
 2 








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

			
	Successor Company:
	SemGroup Corporation
		
	By:	 	 /s/ Robert N. Fitzgerald

	Name:	 	Robert N. Fitzgerald
	Title:	 	Senior Vice President and Chief Financial Officer
	
	Guaranteeing Subsidiaries:
	 SemGas, L.P.
 SemMaterials,
L.P.

	
	By: SemOperating G.P., L.L.C., each such Guarantor’s general partner
		
	By:	 	 /s/ Robert N. Fitzgerald

	Name:	 	Robert N. Fitzgerald
	Title:	 	Senior Vice President and Chief Financial Officer
	
	SemGroup Europe Holding, L.L.C.
	 SemMexico, L.L.C.
 Mid-America
Midstream Gas Services, L.L.C.

		
	By:	 	 /s/ Robert N. Fitzgerald

	Name:	 	Robert N. Fitzgerald
	Title:	 	Chief Financial Officer
	
	 SemOperating G.P., L.L.C.

SemDevelopment, L.L.C.

		
	By:	 	 /s/ Robert N. Fitzgerald

	Name:	 	Robert N. Fitzgerald
	Title:	 	Senior Vice President and Chief Financial Officer
	
	Mid-America Midstream Gas Services, L.L.C.
		
	By:	 	 /s/ Robert N. Fitzgerald

	Name:	 	Robert N. Fitzgerald
	Title:	 	Chief Financial Officer



  
 [Signature Page –
Second Supplemental Indenture] 








 
			
	Guarantors:
	Wattenberg Holding, LLC
	Glass Mountain Holding, LLC
		
	By:	 	Rose Rock Midstream Operating, LLC, each Guarantor’s sole member and manager
		
	By:	 	 /s/ Robert N. Fitzgerald

	Name:	 	Robert N. Fitzgerald
	Title:	 	Senior Vice President and Chief Financial Officer
	
	 Rose Rock Finance Corporation
 Rose
Rock Midstream Operating, LLC
 Rose Rock Midstream Field Services, LLC

Rose Rock Midstream Energy GP, LLC
 SemCrude Pipeline,
L.L.C.

		
	By:	 	 /s/ Robert N. Fitzgerald

	Name:	 	Robert N. Fitzgerald
	Title:	 	Senior Vice President and Chief Financial Officer
	
	Rose Rock Midstream Crude, L.P.
		
	By:	 	Rose Rock Midstream Energy GP, LLC
		
	By:	 	 /s/ Robert N. Fitzgerald

	Name:	 	Robert N. Fitzgerald
	Title:	 	Senior Vice President and Chief Financial Officer



  
 [Signature Page –
Second Supplemental Indenture] 








 
			
	Wilmington Trust, National Association, as Trustee
		
	By:	 	 /s/ Shawn Goffinet

	Name:	 	Shawn Goffinet
	Title:	 	Assistant Vice President



  
 [Signature Page –
First Supplemental Indenture]