Document:

EX-10.15

 Exhibit 10.15 
 UNITED STATES DEPARTMENT OF THE TREASURY 
 1500 Pennsylvania Avenue, NW 
 Washington, D.C. 20220 

August 4, 2011 
 Ladies and
Gentlemen: 
 Reference is made to that certain Letter Agreement incorporating the Securities Purchase Agreement – Standard
Terms (the “Securities Purchase Agreement”), dated as of the date set forth on Schedule A hereto, between the United States Department of the Treasury (the “Investor”) and the company set forth on Schedule A hereto
(the “Company”). Capitalized terms used but not defined herein shall have the meanings assigned to them in the Securities Purchase Agreement. Pursuant to the Securities Purchase Agreement, at the Closing, the Company issued to the
Investor the number of shares of the series of its preferred stock set forth on Schedule A hereto (the “Preferred Shares”) and a warrant to purchase the number of shares of the series of its preferred stock set forth on Schedule A
hereto (such shares, the “Warrant Shares”), which was exercised by the Investor at Closing. 
 In connection
with the consummation of the repurchase (the “Repurchase”) by the Company from the Investor, on the date hereof, of the number of Preferred Shares listed on Schedule A hereto (the “Repurchased Preferred Shares”) and
the number of Warrant Shares listed on Schedule A hereto (the “Repurchased Warrant Shares”), as permitted by the Emergency Economic Stabilization Act of 2008, as amended by the American Recovery and Reinvestment Act of 2009:

 (a) The Company hereby acknowledges receipt from the Investor of the share certificate(s) set forth on
Schedule A hereto representing the Preferred Shares; 
 (b) The Investor hereby acknowledges receipt from the
Company of a wire transfer for the account of the Investor in immediately available funds of the aggregate purchase price set forth on Schedule A hereto, representing payment in full for the Repurchased Preferred Shares at a price per share equal to
the Liquidation Amount per share, together with any accrued and unpaid dividends to, but excluding, the date hereof; 
 (c) The Company hereby acknowledges receipt from the Investor of the share certificate(s) set forth on Schedule A hereto representing the Warrant Shares; and 

(d) The Investor hereby acknowledges receipt from the Company of a wire transfer for the account of the Investor in
immediately available funds of the aggregate purchase price set forth on Schedule A hereto, representing payment in full for the Repurchased Warrant Shares at a price per share equal to the Liquidation Amount per share, together with any accrued and
unpaid dividends to, but excluding, the date hereof. 

 This letter agreement will be governed by and construed in accordance with the federal law
of the United States if and to the extent such law is applicable, and otherwise in accordance with the laws of the State of New York applicable to contracts made and to be performed entirely within such State. 

This letter agreement may be executed in any number of separate counterparts, each such counterpart being deemed to be an original
instrument, and all such counterparts will together constitute the same agreement. Executed signature pages to this letter agreement may be delivered by facsimile and such facsimiles will be deemed sufficient as if actual signature pages had been
delivered. 
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 In witness whereof, the parties have duly executed this letter agreement as of the date
first written above. 
  

					
	 UNITED STATES DEPARTMENT OF
 THE TREASURY

		
	By:	 	 /s/ Timothy G. Massad

		 	Name:	 	Timothy G. Massad
		 	Title:	 	Assistant Secretary for Financial Stability

  

					
	COMPANY:
	
	 FIRST NBC BANK HOLDING
 COMPANY

		
	By:	 	 /s/ Ashton J. Ryan, Jr.

		 	Name:	 	Ashton J. Ryan, Jr. 
		 	Title:	 	President

			
		  	SCHEDULE A
	 General Information:
	  	
		
	 Date of Letter Agreement incorporating the Securities
	  	March 20, 2009
	 Purchase Agreement:
	  	
		
	 Name of the Company:
	  	First NBC Bank Holding Company
		
	 Corporate or other organizational form of the Company:
	  	Corporation
		
	 Jurisdiction of organization of the Company:
	  	Louisiana
		
	 Number and series of preferred stock issued to the Investor at the Closing (Preferred Shares):
	  	17,836 shares of Fixed Rate Cumulative Perpetual Preferred Stock, Series A
		
	 Number and series of preferred stock underlying the Warrant issued to the Investor at the Closing (Warrant Shares):
	  	892 shares of Fixed Rate Cumulative Perpetual Preferred Stock, Series B
		
	 Terms of the Repurchase of the Preferred Shares:
	  	
		
	 Number of Preferred Shares purchased by the Company:
	  	17,836
		
	 Share certificate number (representing the Preferred Shares previously issued to the Investor at the Closing):
	  	A-01
		
	 Per share Liquidation Amount of Preferred Shares:
	  	$1,000
		
	 Accrued and unpaid dividends on Preferred Shares:
	  	$195,700.56
		
	 Aggregate purchase price for Repurchased Preferred Shares:
	  	$18,031,700.56
		
	 Terms of the Repurchase of the Warrant Shares:
	  	
		
	 Number of Warrant Shares purchased by the Company:
	  	892
		
	 Share certificate (representing the Warrant Shares previously issued to the Investor at the Closing):
	  	B-01
		
	 Per share Liquidation Amount of Warrant Shares:
	  	$1,000
		
	 Accrued and unpaid dividends on Warrant Shares:
	  	$17,617.00
		
	 Aggregate purchase price for Repurchased Warrant Shares:
	  	$909,617.00
		
	Aggregate purchase price for Repurchased Preferred Shares and Repurchased Warrant Shares:	  	$18,941,317.56

			
	Investor wire information for payment of purchase	  	ABA Number: 021000018
	price:	  	Bank: The Bank of New York Mellon
		  	Account Name: [intentionally omitted]
		  	Account Number: [intentionally omitted]EX-10.16

 Exhibit 10.16 
 lnvesture Evergreen Fund, LP—2011 Special Term Tranche 
 c/o
Investure Evergreen (GP), LLC 
 126 Garrett Street, Suite J 

Charlottesville, Virginia 22902 
 September 27,2011 
 First NBC Bank Holding Company 

210 Baronne Street 
 New Orleans, Louisiana 70112

 Re: Investment in common stock of First NBC Bank Holding Company, a Louisiana corporation (“First NBC”) by Investure
Evergreen Fund, LP—2011 Special Term Tranche, a series of a Delaware series limited partnership (“Investure”), indirectly through Blue Pine Crescent Limited Partnership, a Delaware limited partnership (“Blue Pine
Crescent”) 
 Dear Madam or Sir: 
 This letter agreement (the “Agreement”) is written in connection with the purchase of shares of common stock of First NBC by Blue Pine Crescent. Investure is the sole limited partner of
Blue Pine Crescent. 
 WHEREAS, First NBC is currently conducting an offering of common stock of First NBC (collectively with
all other outstanding common stock of First NBC, the “Stock”); and 
 WHEREAS, Blue Pine Crescent and its
affiliates and related persons plan to initially purchase approximately 9.9% of the Stock in the aggregate and thereafter Investure desires to maintain the percentage ownership of First NBC referred to in Section I hereof through its investment in
Blue Pine Crescent by purchasing additional interests in Blue Pine Crescent for the purpose of Blue Pine Crescent purchasing additional shares of Stock. 
 NOW, THEREFORE, in connection with the foregoing, Investure, Blue Pine Crescent and First NBC hereby agree as follows: 
  

	I.	Right of First Refusal. First NBC hereby agrees that, from the date of this Agreement through the later of (i) December 31, 2011 or (ii) 10 days
after such date on which all of Castle Creek’s Series C Convertible Perpetual Preferred Stock are fully converted to Stock, Blue Pine Crescent shall have a pre-emptive right to purchase additional shares of Stock offered by First NBC in an
amount sufficient to maintain the aggregate percentage ownership of the Stock by Blue Pine Crescent and any of its affiliates and related persons, as close to, but remaining below, 10% as possible (i.e., such that an additional share of Stock would
cause the aggregate percentage ownership of Stock by Blue Pine Crescent and its affiliates and related persons to equal or exceed 10% of any class of voting securities of First NBC). 

	II.	Non-Voting Board Observation and Information Rights. First NBC hereby agrees that, for so long as Blue Pine Crescent holds greater than 2% of the Stock, Blue
Pine Crescent shall have the right (i) to select and/or appoint a person to serve as a non-voting observer for all meetings of the board of directors of First NBC and (ii) through its non-voting observer, to receive all information
regarding First NBC that directors of First NBC receive (including information that directors of First NBC are entitled to receive) in connection with their duties. Accordingly, copies of all such information shall be provided to Blue Pine
Crescent’s non-voting observer as soon as reasonably practicable. 

  

	III.	Prohibited First NBC Actions. Without the prior written consent of Blue Pine Crescent and Investure, First NBC hereby agrees, in accordance with applicable law,
not to take any action, and omit to take any action, that would cause the aggregate percentage ownership of the Stock by Blue Pine Crescent and its affiliates and related persons to equal or exceed 10% of any class of voting securities of First NBC.

  

	IV.	Assignment of Rights. Blue Pine Crescent and First NBC hereby agree that, to the extent Investure shall hold the Stock directly (as opposed to through Blue Pine
Crescent), the rights and benefits granted to Blue Pine Crescent under this Agreement shall be assigned to, and vested in, Investure. 

  

	V.	Confidentiality. Each party hereto will keep the existence and contents of this Agreement and the discussions between the parties hereto regarding the matters
described in this Agreement (the “Confidential Information”) confidential and will not disclose such Confidential Information without the express written consent of the other parties; provided, however, that each party may disclose
Confidential Information (i) on a confidential basis to its attorneys in connection with the matters described in this Agreement and (ii) to any governmental or regulatory body with legal or regulatory oversight of it.

  

	VI.	Representations and Warranties. Each party hereby represents and warrants as of the date of this Agreement to the other parties that: 

 

	 	(i)	it is duly organized, validly existing, and in good standing under the laws of the jurisdiction of its formation, and is in good standing in respect of same;

  

	 	(ii)	it has duly executed and delivered this Agreement and this Agreement constitutes the legal, valid and binding obligation of the party, enforceable against the party in
accordance with its terms; and 

  

	 	(iii)	it has the absolute and unrestricted right, power and authority to execute and deliver this Agreement, and all documents related thereto to which it is a party, and to
perform its obligations hereunder and has all necessary legal capacity to enter into this Agreement and all instruments and documents related hereto. 

  
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	VII.	Governing Law; Severability. This Agreement shall be governed by and enforced in accordance with the laws of the State of Delaware, without regard to
conflict-of-laws principles thereof that would require the application of any other law. If any provision of this Agreement is held invalid or unenforceable by any court of competent jurisdiction, the other provisions of this Agreement will remain
in full force and effect. Any provision of this Agreement held invalid or unenforceable only in part or degree will remain in full force and effect to the extent not held invalid or unenforceable. 

 

	VIII.	Survival of Representations and Warranties. The parties’ representations and warranties, and covenants and agreements hereunder shall survive without
limitation. 

  

	IX.	Entire Agreement and Modification. This Agreement supersedes all prior agreements, whether written or oral, between the parties with respect to its subject
matter (including any term sheet) and constitutes a complete and exclusive statement of the terms of the agreement between the parties with respect to its subject matter. This Agreement may not be amended, supplemented, or otherwise modified except
by a written agreement executed by the party to be charged with the amendment. 

  

	X.	Counterparts. This Agreement may be executed in one or more counterparts, each of which will be deemed to be an original copy of this Agreement and all of which,
when taken together, will be deemed to constitute one and the same agreement. The exchange of copies of this Agreement and of signature pages by facsimile transmission or “portable document format” (commonly referred to as “pdf”)
shall constitute effective execution and delivery of this Agreement as to the parties and may be used in lieu of the original Agreement for all purposes. Signatures of the parties transmitted by facsimile or “portable document format”
shall be deemed to be their original signatures for all purposes. 

 [signature page follows] 

  
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 IN WITNESS WHEREOF, the undersigned have signed this Agreement effective as of the date
first set above. 
 INVESTURE EVERGREEN FUND, LP - 2011 SPECIAL TERM TRANCHE 
 By: Investure Evergreen (GP), LLC, its general partner 
 By: Investure, LLC, its
managing member 
  

			
	                By:	 	/s/ Hans Schroeder
		 	 Name: Hans Schroeder

		 	 Title: Managing Member

 BLUE PINE CRESCENT CRESCENT LIMITED PARTNERSHIP 
 By: Blue Pine Crescent Partners, LLC, its general partner 
  

			
	        By:	 	/s/ Hans Schroeder
		 	 Name: Hans Schroeder

		 	 Title: Managing Member

 FIRST NBC BANK HOLDING COMPANY 
  

			
	By:	 	/s/ Ashton J. Ryan, Jr.
		 	Name: Ashton J. Ryan, Jr.
		 	Title: President & CEO

  
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