Document:

EX-4.16

 Exhibit 4.16 

EXECUTION VERSION 

GUARANTOR JOINDER AGREEMENT (this “Guarantor Joinder Agreement”) dated as of October 1, 2015 among BLACKSTONE
HOLDINGS FINANCE CO. L.L.C. (the “Borrower”), BLACKSTONE HOLDINGS I L.P., BLACKSTONE HOLDINGS II L.P., BLACKSTONE HOLDINGS III L.P., and BLACKSTONE HOLDINGS IV L.P. (collectively, the “Existing Guarantors”),
BLACKSTONE HOLDINGS AI L.P., a Delaware limited partnership (the “New Guarantor”) and CITIBANK, N.A., as administrative agent (the “Administrative Agent”). 

A. Reference is made to the Credit Agreement dated as of March 23, 2010, as amended and restated as of May 29, 2014 (as further amended,
restated, supplemented or otherwise modified from time to time, the “Credit Agreement”), among Blackstone Holdings Finance Co. L.L.C., as Borrower, Blackstone Holdings I L.P., Blackstone Holdings II L.P., Blackstone Holdings III
L.P., and Blackstone Holdings IV L.P., as Guarantors, the Lenders from time to time party thereto and the Administrative Agent. 
 B.
Capitalized terms used but not otherwise defined herein have the meanings assigned to them in the Credit Agreement. 
 C. Under the Credit
Agreement, the Lenders have agreed, upon the terms and subject to the conditions therein set forth, to make Loans to the Borrower, and the Borrower, the Existing Guarantors and the New Guarantor desire that the New Guarantor become a Guarantor under
the Credit Agreement pursuant to the provisions of Section 2.20 of the Credit Agreement. 
 Accordingly, the parties hereto agree as
follows: 
 SECTION 1. Each of the Borrower, the Existing Guarantors and the New Guarantor represents and warrants to the Lenders and the
Administrative Agent that the New Guarantor is an Eligible Additional Guarantor. Upon the effectiveness hereof, the New Guarantor, by joining the Credit Agreement as evidenced by its signature below, represents and warrants that all the
representations and warranties in the Credit Agreement relating to the New Guarantor (after giving effect to this Guarantor Joinder Agreement) are true and correct on and as of the date hereof, except to the extent such representations and
warranties expressly relate to an earlier date, in which case they shall be true and correct as of such earlier date. 
 SECTION 2. In
accordance with Section 2.20 of the Credit Agreement, the New Guarantor, upon the effectiveness hereof, becomes a Guarantor under the Credit Agreement with the same force and effect as if originally named therein as a Guarantor, and the New
Guarantor hereby agrees to all the terms and provisions of the Credit Agreement applicable to it as a Guarantor thereunder. Each reference to a “Guarantor” in the Credit Agreement shall, upon effectiveness hereof, be deemed to include the
New Guarantor. The New Guarantor agrees that it will be jointly and severally liable for the Obligations of the Borrower under the Credit Agreement together with the Existing Guarantors. 

SECTION 3. The New Guarantor represents and warrants to the Administrative Agent and the Lenders that this Guarantor Joinder Agreement has
been duly authorized, executed 

 
and delivered by it and constitutes its legal, valid and binding obligation, enforceable against it in accordance with its terms, except as may be limited by applicable bankruptcy, insolvency,
reorganization, moratorium or similar laws affecting creditors’ rights generally and by general principles of equity (regardless of whether enforcement is sought in a proceeding in equity or at law). 

SECTION 4. This Guarantor Joinder Agreement may be executed in counterparts (and by different parties hereto on different counterparts), each
of which shall constitute an original, but all of which when taken together shall constitute a single contract. This Guarantor Joinder Agreement shall become effective (i) when the Administrative Agent shall have received counterparts hereof that,
when taken together, bear the signatures of the Borrower, the New Guarantor, each of the Existing Guarantors and the Administrative Agent and (ii) the other conditions with respect to the New Guarantor and this Guarantor Joinder Agreement set forth
in Section 4.03 of the Credit Agreement have been satisfied. Delivery of an executed signature page to this Guarantor Joinder Agreement by facsimile transmission shall be effective as delivery of a manually signed counterpart hereof. 

SECTION 5. Except as expressly supplemented hereby, the Credit Agreement shall remain in full force and effect. This Guarantor Joinder
Agreement shall constitute a Loan Document for all purposes of the Credit Agreement. 
 SECTION 6. THIS GUARANTOR JOINDER AGREEMENT SHALL
BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK. 
 SECTION 7. In the event any one or more of the
provisions contained in this Guarantor Joinder Agreement should be held invalid, illegal or unenforceable in any respect, the validity, legality and enforceability of the remaining provisions contained herein shall not in any way be affected or
impaired thereby (it being understood that the invalidity of a particular provision in a particular jurisdiction shall not in and of itself affect the validity of such provision in any other jurisdiction). The parties hereto shall endeavor in
good-faith negotiations to replace the invalid, illegal or unenforceable provisions with valid provisions the economic effect of which comes as close as possible to that of the invalid, illegal or unenforceable provisions. 

SECTION 8. All communications and notices hereunder shall be in writing and given as provided in the Credit Agreement. All communications and
notices hereunder to the New Guarantor shall be given to it at the address set forth under its signature. 
 SECTION 9. The Borrower, the
New Guarantor and the Existing Guarantors agree, jointly and severally, to reimburse the Administrative Agent for its reasonable out-of-pocket expenses in connection with this Guarantor Joinder Agreement, including the reasonable fees, other charges
and disbursements of counsel for the Administrative Agent. 

  
 2 

 IN WITNESS WHEREOF, each of the parties hereto has caused this Guarantor Joinder Agreement to be
duly executed by its authorized officer as of the day and year first above written. 
  

					
	BLACKSTONE HOLDINGS FINANCE CO. L.L.C.
		
	By:	 	 /s/ John G. Finley

			
		 	Name:	 	 John G. Finley

			
		 	Title:	 	 Chief Legal Officer

 [Signature Page to Guarantor Joinder Agreement] 

 
					
	BLACKSTONE HOLDINGS I L.P.
	By: Blackstone Holdings I/II GP Inc., its General Partner
		
	By:	 	 /s/ John G. Finley

			
		 	Name:	 	 John G. Finley

			
		 	Title:	 	 Chief Legal Officer

 [Signature Page to Guarantor Joinder Agreement] 

 
					
	BLACKSTONE HOLDINGS II L.P.
	By: Blackstone Holdings I/II GP Inc., its General Partner
		
	By:	 	 /s/ John G. Finley

			
		 	Name:	 	 John G. Finley

			
		 	Title:	 	 Chief Legal Officer

 [Signature Page to Guarantor Joinder Agreement] 

 
					
	BLACKSTONE HOLDINGS III L.P.
	By: Blackstone Holdings III GP L.P., its General Partner
	By: Blackstone Holdings III GP Management L.L.C., its General Partner
	By:	 	The Blackstone Group L.P., its sole member,
	By: Blackstone Group Management L.L.C., its General Partner
		
	By:	 	 /s/ John G. Finley

			
		 	Name:	 	 John G. Finley

			
		 	Title:	 	 Chief Legal Officer

 [Signature Page to Guarantor Joinder Agreement] 

 
					
	BLACKSTONE HOLDINGS IV L.P.
	By: Blackstone Holdings IV GP L.P., its General Partner
	By: Blackstone Holdings IV GP Management (Delaware) L.P., its General Partner
	By: Blackstone Holdings IV GP Management L.L.C., its General Partner
	By:	 	The Blackstone Group L.P., its sole member,
	By: Blackstone Group Management L.L.C., its General Partner
		
	By:	 	 /s/ John G. Finley

			
		 	Name:	 	 John G. Finley

			
		 	Title:	 	 Chief Legal Officer

 [Signature Page to Guarantor Joinder Agreement] 

 
					
	BLACKSTONE HOLDINGS AI L.P.
	By: Blackstone Holdings I/II GP Inc., its General Partner
		
	By:	 	 /s/ John G. Finley

			
		 	Name:	 	 John G. Finley

			
		 	Title:	 	 Chief Legal Officer

	
	Address and telecopy number for notices:
	
	 c/o The Blackstone Group L.P.

	 345 Park Avenue

	 New York, New York 10154

	 Fax +1 212-583-5749

 [Signature Page to Guarantor Joinder Agreement] 

 
					
	CITIBANK, N.A., as Administrative Agent,
		
	By:	 	 /s/ Maureen P. Maroney

			
		 	Name:	 	 Maureen P. Maroney

			
		 	Title:	 	 Authorized Signatory

 [Signature Page to Guarantor Joinder Agreement]EX-4.17

 Exhibit 4.17 

Execution Version 
  

 
  

EIGHTH SUPPLEMENTAL INDENTURE 

Dated as of October 1, 2015 

Supplementing and Amending that Certain 

INDENTURE 
 Dated as of August 20,
2009 
  
  

Among 
 BLACKSTONE HOLDINGS
FINANCE CO. L.L.C., 
 THE GUARANTOR PARTIES HERETO 

and 
 THE BANK OF NEW YORK MELLON,

 as Trustee 
  

 
  

 TABLE OF CONTENTS 
  

					
	 	  	Page	 
		
	 ARTICLE I Additional Guarantor
	  	 	2	  
		
	 SECTION 1.1. Additional Guarantor.
	  	 	2	  
		
	 ARTICLE II Miscellaneous
	  	 	2	  
		
	 SECTION 2.1. Definitions.
	  	 	2	  
	 SECTION 2.2. Execution as Supplemental Indenture.
	  	 	3	  
	 SECTION 2.3. Relationship with Base Indenture.
	  	 	3	  
	 SECTION 2.4. Not Responsible for Recitals.
	  	 	3	  
	 SECTION 2.5. Separability Clause.
	  	 	3	  
	 SECTION 2.6. Successors and Assigns.
	  	 	3	  
	 SECTION 2.7. Execution and Counterparts.
	  	 	4	  
	 SECTION 2.8. Governing Law.
	  	 	4	  

  
 i 

 This Eighth Supplemental Indenture, dated as of October 1, 2015 (the
“Eighth Supplemental Indenture”), among Blackstone Holdings Finance Co. L.L.C., a limited liability company duly organized and existing under the laws of the State of Delaware, having its principal office at 345
Park Avenue, New York, New York 10154 (the “Company”), the Existing Guarantors (as hereinafter defined), Blackstone Holdings AI L.P., a Delaware limited partnership (the “New Guarantor”), and The Bank of New York
Mellon, a New York banking corporation, as Trustee under the Base Indenture (as hereinafter defined) and hereunder (the “Trustee”), supplements that certain Indenture, dated as of August 20, 2009, among the Company, the Existing
Guarantors and the Trustee (the “Base Indenture” and subject to Section 2.3 hereof, together with this Eighth Supplemental Indenture, the “Indenture”). 

RECITALS OF THE COMPANY 

The Company and the Existing Guarantors have heretofore executed and delivered to the Trustee the Base Indenture providing for the issuance
from time to time of one or more series of the Company’s senior unsecured debt securities (herein and in the Base Indenture called the “Securities”), the forms and terms of which are to be determined as set forth in Sections
201 and 301 of the Base Indenture, and the Guarantees thereof by the Existing Guarantors; 
 The New Guarantor is a “New Holdings
Partnership Entity,” as defined in the Base Indenture; 
 Section 1402 of the Base Indenture provides that the Company and each
Existing Guarantor shall cause each New Holding Partnership Entity (other than a Non Guarantor Entity) to become a Guarantor and provide a Guarantee in respect of the Securities; 

Sections 901(4) and 901(14) of the Base Indenture provide, among other things, that the Company, the Guarantors and the Trustee may enter into
indentures supplemental to the Base Indenture without the consent of the Holders for certain purposes, including, among others, to add a new Guarantor or to change any other provision contained in the Securities of any series or under the Base
Indenture that does not adversely affect the interests of the Holders of Securities of such series in any material respect; 
 The New
Guarantor desires to become a Guarantor and to provide Guarantees with respect to the obligations of the Company and the Existing Guarantors under the Indenture and the Securities issued thereunder; 

The Company and each of the Guarantors have duly authorized the execution and delivery of this Eighth Supplemental Indenture as provided for
in the Base Indenture; and 
 All things necessary have been done to make this Eighth Supplemental Indenture a valid and legally binding
agreement of the Company and the Guarantors, in accordance with its terms. 

  
 1 

 ARTICLE I 

Additional Guarantor 

SECTION 1.1. Additional Guarantor. 

The New Guarantor, by its execution of this Eighth Supplemental Indenture, agrees that it is a Guarantor under the Indenture and is bound by
the terms of the Indenture applicable to Guarantors, including, but not limited to, Article XIV of the Base Indenture. 
 ARTICLE II 

Miscellaneous 
 SECTION
2.1. Definitions. 
 For all purposes of this Eighth Supplemental Indenture (except as herein otherwise expressly provided or unless
the context of this Eighth Supplemental Indenture otherwise requires): 
 (1) any reference to an “Article” or a
“Section” refers to an Article or a Section, as the case may be, of this Eighth Supplemental Indenture; 
 (2) the words
“herein,” “hereof” and “hereunder” and other words of similar import refer to this Eighth Supplemental Indenture as a whole and not to any particular Article, Section or other subdivision; 

(3) “including” means including without limitation; 

(4) unless otherwise provided, references to agreements and other instruments shall be deemed to include all amendments and other
modifications to such agreements and instruments, but only to the extent such amendments and other modifications are not prohibited by the terms of this Eighth Supplemental Indenture. 

The terms defined in this Section 2.1 (except as herein otherwise expressly provided or unless the context of this Eighth Supplemental
Indenture otherwise requires) for all purposes of this Eighth Supplemental Indenture and of any indenture supplemental hereto have the respective meanings specified in this Section 2.1. All other terms used in this Eighth Supplemental Indenture
that are defined in the Base Indenture, either directly or by reference therein (except as herein otherwise expressly provided or unless the context of this Eighth Supplemental Indenture otherwise requires), have the respective meanings assigned to
such terms in the Base Indenture, as in force at the date of this Eighth Supplemental Indenture as originally executed; provided that any term that is defined in both the Base Indenture and this Eighth Supplemental Indenture shall have the
meaning assigned to such term in this Eighth Supplemental Indenture. 
 “Base Indenture” has the meaning specified in the
preamble hereto. 

  
 2 

 “Eighth Supplemental Indenture” has the meaning specified in the preamble
hereto. 
 “Existing Guarantors” means the entities party to the Base Indenture identified as Guarantors therein. 

“Indenture” has the meaning specified in the preamble hereto. 

“New Guarantor” has the meaning specified in the preamble hereto. 

“Securities” has the meaning specified in the preamble hereto. 

“Trustee” has the meaning specified in the preamble hereto. 

SECTION 2.2. Execution as Supplemental Indenture. 

This Eighth Supplemental Indenture is executed and shall be construed as an indenture supplemental to the Base Indenture and, as provided in
the Base Indenture, this Eighth Supplemental Indenture forms a part thereof. 
 SECTION 2.3. Relationship with Base Indenture. 

The terms and provisions contained in the Base Indenture will constitute, and are hereby expressly made, a part of this Eighth Supplemental
Indenture. However, to the extent any provision of the Base Indenture conflicts with the express provisions of this Eighth Supplemental Indenture, the provisions of this Eighth Supplemental Indenture will govern and be controlling. 

SECTION 2.4. Not Responsible for Recitals. 

The recitals contained herein shall be taken as the statements of the Company and the Guarantors, as the case may be, and the Trustee assumes
no responsibility for their correctness. The Trustee makes no representations as to the validity or sufficiency of this Eighth Supplemental Indenture or of the Securities or the Guarantees. 

SECTION 2.5. Separability Clause. 

In case any provision in this Eighth Supplemental Indenture shall be invalid, illegal or unenforceable, the validity, legality and
enforceability of the remaining provisions shall not in any way be affected or impaired thereby. 
 SECTION 2.6. Successors and
Assigns. 
 All covenants and agreements in this Eighth Supplemental Indenture by the Company and the Guarantors shall bind their
respective successors and assigns, whether so expressed or not. All agreements of the Trustee in this Eighth Supplemental Indenture shall bind its successors and assigns, whether so expressed or not. 

  
 3 

 SECTION 2.7. Execution and Counterparts. 

This Eighth Supplemental Indenture may be executed in any number of counterparts, each of which so executed shall be deemed to be an original,
and all such counterparts shall together constitute but one and the same instrument. 
 SECTION 2.8. Governing Law. 

This Eighth Supplemental Indenture shall be governed by, and construed in accordance with, the law of the State of New York. 

[Signature page to follow.] 

  
 4 

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

					
	The Company
	
	Blackstone Holdings Finance Co. L.L.C.
		
	By:	 	Blackstone Holdings I L.P., its sole member
		
	By:	 	Blackstone Holdings I/II GP Inc., its general partner
		
	By:	 	 /s/ John G. Finley

		 	Name:	 	John G. Finley
		 	Title:	 	Chief Legal Officer
	
	The Existing Guarantors
	
	Blackstone Holdings I L.P.
		
	By:	 	Blackstone Holdings I/II GP Inc., its general partner
		
	By:	 	 /s/ John G. Finley

		 	Name:	 	John G. Finley
		 	Title:	 	Chief Legal Officer
	
	Blackstone Holdings II L.P.
		
	By:	 	Blackstone Holdings I/II GP Inc., its general partner
		
	By:	 	 /s/ John G. Finley

		 	Name:	 	John G. Finley
		 	Title:	 	Chief Legal Officer

 [Signature Page to Eighth Supplemental Indenture] 

 
					
	Blackstone Holdings III L.P.
		
	By:	 	Blackstone Holdings III GP L.P., its general partner
		
	By:	 	Blackstone Holdings III GP Management L.L.C., its general partner
		
	By:	 	The Blackstone Group L.P., its sole member
		
	By:	 	Blackstone Group Management L.L.C., its general partner
		
	By:	 	 /s/ John G. Finley

		 	Name:	 	John G. Finley
		 	Title:	 	Chief Legal Officer
	
	Blackstone Holdings IV L.P.
		
	By:	 	Blackstone Holdings IV GP L.P., its general partner
		
	By:	 	Blackstone Holdings IV GP Management (Delaware) L.P., its general partner
		
	By:	 	Blackstone Holdings IV GP Management L.L.C., its general partner
		
	By:	 	The Blackstone Group L.P., its sole member
		
	By:	 	Blackstone Group Management L.L.C., its general partner
		
	By:	 	 /s/ John G. Finley

		 	Name:	 	John G. Finley
		 	Title:	 	Chief Legal Officer

 [Signature Page to Eighth Supplemental Indenture] 

 
					
	The Blackstone Group L.P.
		
	By:	 	Blackstone Group Management L.L.C., its general partner
		
	By:	 	 /s/ John G. Finley

		 	Name:	 	John G. Finley
		 	Title:	 	Chief Legal Officer
	
	The New Guarantor
	
	Blackstone Holdings AI L.P.
		
	By:	 	Blackstone Holdings I/II GP Inc., its general partner
		
	By:	 	 /s/ John G. Finley

		 	Name:	 	John G. Finley
		 	Title:	 	Chief Legal Officer

 [Signature Page to Eighth Supplemental Indenture] 

 
					
	 The Bank of New York Mellon,
 as
Trustee

		
	By:	 	 /s/ Laurence J. O’Brien

		 	Name:	 	Laurence J. O’Brien
		 	Title:	 	Vice President

 [Signature Page to Eighth Supplemental Indenture]

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