EX-10.44



 Exhibit 10.44 

AMENDMENT TO 
 SEVENTH
AMENDED AND RESTATED 
 LIMITED LIABILITY COMPANY AGREEMENT 

THIS AMENDMENT TO SEVENTH AMENDED AND RESTATED LIMITED LIABILITY COMPANY AGREEMENT (this “Amendment”) is made as of
[                    ], 2015. Capitalized terms used but not defined herein shall have the meanings ascribed to such terms in the Seventh Amended and
Restated Limited Liability Company Agreement (as amended or modified from time to time in accordance with its terms, the “LLC Agreement”) of NMH Investment, LLC (the “Company”), dated as of September 16, 2014.

 RECITALS 
 WHEREAS, Vestar
Capital Partners V-A, L.P., a Cayman Islands exempted limited partnership (“VCP-A”), and Vestar Capital Partners V-B, L.P., a Cayman Islands exempted limited partnership (“VCP-B”), have been holders of Membership
Interests in the Company since June 29, 2006 (the “Membership Date”); 
 WHEREAS, by their signature hereto, the
Company and the Vestar Member (as defined in the LLC Agreement, without giving effect to this Amendment) are authorizing and approving this Amendment in accordance with Section 7.5 of the LLC Agreement in order to correct a prior
scrivener’s error; and 
 WHEREAS, by their signature hereto, VCP-A and VCP-B are confirming again their acceptance of the terms and
provisions of the LLC Agreement. 
 1. Consent to Amendment to the LLC Agreement. By executing this Amendment, the Company and the
Vestar Member hereby consent to and approve the amendment of the LLC Agreement as set forth in Section 2 hereof. 
 2. Amendments to
the LLC Agreement. 
 2.1. The preamble of the LLC Agreement is hereby amended and restated in its entirety to read as follows: 

THIS SEVENTH AMENDED AND RESTATED LIMITED LIABILITY COMPANY AGREEMENT (as amended or modified from time to time in accordance
with its terms, this “Agreement”) of NMH Investment, LLC (the “Company”), dated and effective as of September 16, 2014, is adopted by, and executed and agreed to, for good and valuable consideration, by and
among Vestar Capital Partners V, L.P., a Cayman Islands exempted limited partnership (“VCP”), Vestar Capital Partners V-A, L.P., a Cayman Islands exempted limited partnership (“VCP-A”), Vestar Capital Partners V-B,
L.P., a Cayman Islands exempted limited partnership (“VCP-B”), Vestar/NMH Investors, LLC, a Delaware limited liability company (“Vestar/NMH Investors” and together with VCP,
VCP-A and VCP-B, the “Vestar Member”), and the other Persons listed as Members in the books and records of the Company as of the date hereof that have executed this Agreement, the First Amended and Restated Agreement, the Second


  
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Amended and Restated Agreement, the Third Amended and Restated Agreement, the Fourth Amended and Restated Agreement, the Fifth Amended and Restated Agreement, the Sixth Amended and Restated
Agreement or any counterparts thereof, and each other Person who becomes a Member in accordance with the terms of this Agreement. Any reference in this Agreement to the Vestar Member shall include its successors to the extent such successors have
become substituted Members in accordance with the provisions of this Agreement. 
 2.2. A new Section 7.14 is hereby added to the LLC
Agreement to read as follows: 
 Section 7.14 Treatment of Membership. The Company and the Members shall treat
VCP-A and VCP-B as holders of Membership Interests in the Company from the Membership Date. 
 3. No Other Amendments. The amendments
set forth herein are limited precisely as written and shall not be deemed to be an amendment of any other term or condition of the LLC Agreement or any of the documents referred to therein. Whenever the LLC Agreement is referred to in the LLC
Agreement or in any other agreements, documents or instruments, such reference shall be to the LLC Agreement as amended hereby. Except as expressly amended hereby, the terms and conditions of the LLC Agreement shall continue in full force and
effect. 
 4. Joinder. By their signature hereto, VCP-A and VCP-B hereby confirm their acceptance of the terms and provisions of the
LLC Agreement, effective as of the Membership Date, as an original party thereto. 
 5. Counterparts. This Amendment may be executed
in any number of counterparts (including by facsimile or electronic copy), none of which need to contain more than the signature of one party, each of which shall be an original and all of which together shall constitute one and the same agreement.


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

			
	COMPANY:
	
	NMH INVESTMENT, LLC
		
	By:	 	  

	Name:	 	  

	Title:	 	  

	
	VESTAR MEMBER:
	
	VESTAR CAPITAL PARTNERS V, L.P.
		
	By:	 	Vestar Associates V, L.P.
	Its:	 	General Partner
		
	By:	 	Vestar Managers V, Ltd.
	Its:	 	General Partner
		
	By:	 	  

	Name:	 	  

	Title:	 	Managing Director
	
	VESTAR/NMH INVESTORS, LLC
		
	By:	 	  

	Name:	 	  

	Title:	 	  



 Signature Page to Amendment to Seventh Amended and Restated Limited Liability Company Agreement 







 
			
	VESTAR CAPITAL PARTNERS V-A, L.P.
		
	By:	 	Vestar Associates V, L.P.
	Its:	 	General Partner
		
	By:	 	Vestar Managers V, Ltd.
	Its:	 	General Partner
		
	By:	 	  

	Name:	 	  

	Title:	 	Managing Director
	
	VESTAR CAPITAL PARTNERS V-B, L.P.
		
	By:	 	Vestar Associates V, L.P.
	Its:	 	General Partner
		
	By:	 	Vestar Managers V, Ltd.
	Its:	 	General Partner
		
	By:	 	  

	Name:	 	  

	Title:	 	Managing Director


 Signature Page to Amendment to Seventh Amended and Restated Limited Liability Company Agreement