Document:

First Supplemental Indenture National Mercantile

 Exhibit 4.5 
 FIRST SUPPLEMENTAL INDENTURE 
 THIS FIRST SUPPLEMENTAL INDENTURE (this “Supplemental
Indenture”) is dated as of March 12, 2007, by and between First California Financial Group, Inc., a Delaware corporation (the “Successor Company"), and Wilmington Trust Company, a Delaware banking corporation (the
“Trustee”). 
 RECITALS 
 WHEREAS, National Mercantile Bancorp, a California corporation (the “Existing Issuer”), and the Trustee entered into an Indenture dated as of January 25, 2007 (the “Indenture”), pursuant to which the Fixed/Floating
Rate Junior Subordinated Deferrable Interest Debentures (the “Debentures”) have been issued by the Existing Issuer; and 
 WHEREAS,
on the date of this Supplemental Indenture, the Existing Issuer has been merged with and into the Successor Company, with the Successor Company being the surviving corporation (the “Merger”), whereupon the separate corporate existence of
the Existing Issuer has ceased; and 
 WHEREAS, Section 11.1 of the Indenture requires that the Successor Company expressly assume, by a
supplemental indenture executed and delivered to the Trustee by the Successor Company, the due and punctual payment of the principal of (and premium, if any) and the interest on all of the Debentures in accordance with their terms, and the due and
punctual performance and observance of all the covenants and conditions of the Indenture to be kept or performed by the Existing Issuer; and 
 WHEREAS, Section 9.1(a) of the Indenture authorizes, without the consent of any Securityholders, the execution of a supplemental indenture to evidence the succession of another corporation to the Existing Issuer, and the assumption by
any such successor of the covenants, agreements, and obligations of the Existing Issuer under the Indenture; and 
 WHEREAS, the Existing
Issuer has delivered to the Trustee an Officers’ Certificate stating that the Merger and this Supplemental Indenture comply with Article IX of the Indenture and that all conditions precedent therein provided for relating to the Merger have been
complied with; and 
 WHEREAS, capitalized terms used and not otherwise defined herein shall have the respective meanings assigned to such
terms in the Indenture. 
 NOW, THEREFORE, in compliance with Section 11.1 of the Indenture, and in consideration of the covenants
contained herein and intending to be legally bound hereby, the Successor Company and the Trustee, for the benefit of the Securityholders, agree as follows: 
 1. Assumption of Payment and Performance. (a) The Successor Company hereby expressly assumes the due and punctual payment of the principal of (and premium, if any) and interest on all of the Debentures and
the due and punctual performance and observance of all of the covenants and conditions of the Indenture on the part of the Existing Issuer to be performed or observed. 

 (b) Pursuant to Section 11.2 of the Indenture, the Successor Company shall succeed to, and be
substituted for the Existing Issuer, and may exercise every right and power of, the Existing Issuer under the Indenture with the same effect as if the Successor Company had originally been the Existing Issuer under the Indenture. 
 2. Effect of Supplemental Indenture. (a) Upon the execution of this Supplemental Indenture, (i) the Indenture has been and hereby is
modified in accordance herewith; (ii) this Supplemental Indenture forms a part of the Indenture for all purposes; (iii) except as modified and amended by this Supplemental Indenture, the Indenture shall continue in full force and effect;
(iv) the Debentures shall continue to be governed by the Indenture; and (v) every Securityholder heretofore or hereafter under the Indenture shall be bound by this Supplemental Indenture. 
 (b) Upon the effectiveness of this Supplemental Indenture, each reference in the Indenture to “this Indenture,” “hereunder,”
“herein” or words of like import shall mean and be a reference to the Indenture, as affected, amended and supplemented hereby. 
 (c) Upon the effectiveness of this Supplemental Indenture, all references in each of the Debentures, and in the other documents and instruments executed in connection therewith, to the Indenture, including each term defined by reference to
the Indenture, shall mean and be a reference to the Indenture or such term, as the case may be, as affected, amended and supplemented hereby. 
 3. Conditions of Effectiveness. This Supplemental Indenture shall become effective at the effective time of the Merger following executions of the Trustee and the Successor Company of counterparts of this Supplemental Indenture.

 4. Notation on Debentures. Debentures authenticated and delivered on or after the date hereof shall bear the following notation,
which may be printed or typewritten thereon: 
 “Effective March 12, 2007, National Mercantile Bancorp, a California corporation
(the “Issuer”), was merged with and into First California Financial Group, Inc., a Delaware corporation (the “Successor Company”). Pursuant to the First Supplemental Indenture, dated as of March 12, 2007, the Successor
Company has assumed the obligations of the Issuer and the performance of every covenant and condition of the Indenture on the part of the Issuer to be performed or observed.” 
 If the Successor Company shall so determine, new Debentures so modified as to conform to the Indenture as hereby supplemented, in form satisfactory to the Trustee, may at any time hereafter be prepared and executed by
the Successor Company and authenticated and delivered by the Trustee or the Authenticating Agent in exchange for the Debentures then outstanding, and thereafter the notation herein provided shall no longer be required. Anything herein or in the
Indenture to the contrary notwithstanding, the failure to affix the notation herein provided as to any Debenture or to exchange any Debenture for a new Debenture modified as herein provided shall not affect any of the rights of the holder of such
Debenture. 

 5. 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 Successor Company. 
 6. Governing Law. This Supplemental Indenture shall be governed by and construed in accordance with the laws of the State of New York, without
regard to conflict of law principles thereof. 
 7. Successors and Assigns. This Supplemental Indenture shall be binding upon and
inure to the benefit of and be enforceable by the respective successors and assigns of the parties hereto and the holders of any Debentures then outstanding. 
 8. Headings. The headings used in this Supplemental Indenture are inserted for convenience only and shall not in any way affect the meaning or construction of any provision of this Supplemental Indenture.

 9. Counterparts. This Supplemental Indenture may be executed in several counterparts, each of which shall be an original and all of
which shall constitute one and the same instrument. 
 IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be
duly executed by their respective officers thereunto duly authorized, as of the day and year first above written. 
  

			
	 FIRST CALIFORNIA FINANCIAL GROUP,
 INC., as
Successor Company

		
	By:	 	/s/ C. G. Kum
	Name: 	 	C. G. Kum
	Title:	 	President and Chief Executive Officer

  

			
	WILMINGTON TRUST COMPANY, as Trustee
		
	By:	 	/s/ Christopher J. Slaybaugh
	Name: 	 	Christopher J. Slaybaugh
	Title:	 	Senior Financial Services Officer1st Amendment to Stockholders' Agreement

 Exhibit 4(a)(1) 
 FIRST AMENDMENT TO STOCKHOLDERS’ AGREEMENT 
 THIS FIRST AMENDMENT TO STOCKHOLDERS’
AGREEMENT, dated as of August 22, 2005 (this “Amendment”), is entered into in connection with that certain Stockholders’ Agreement dated as of June 18, 2004 (as amended, supplemented, restated or replaced from time to
time, the “Stockholders’ Agreement”), by and among NewStar Financial, Inc. a Delaware corporation (formerly known as Novus Capital, Inc.) (“the “Company”) and the other signatories thereto. Capitalized
terms used but not defined herein shall have the meanings provided in the Stockholders’ Agreement. 
 R E C I T A L S 

WHEREAS, the parties hereto are the Company and the Investors holding more than sixty-six and two thirds percent (66-2/3%) of the outstanding
Common Stock, Class A Common Stock and Preferred Stock held by Investors as of the date of this Amendment, as required pursuant to Section 7.03(a) of the Stockholders’ Agreement; 
 WHEREAS, the parties hereto desire to amend the Stockholders’ Agreement in certain respects and to ratify and approve certain prior acts of
the Company all as provided herein; 
 NOW, THEREFORE, based upon the above Recitals, the mutual premises and agreements contained
herein, and other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereto, intending to be legally bound, hereby agree as follows: 
 SECTION 1. AMENDMENT. 
 Section 1.01(a) of the Stockholders’ Agreement (Definitions) is hereby amended by adding the following definition in the proper alphabetical order therein: 
 “Controlled Company” means any entity with respect to which (i) any Stockholder, directly or indirectly, has the power to direct or
cause the direction of the management and policies of such entity, whether through the ownership of a majority of voting securities, by contract or otherwise, or (ii) any Stockholder has the power to appoint and remove one or more of the
directors, general partners or other managers thereof.” 
 Section 2.09 of the Stockholders’ Agreement (Matters
Requiring Board Authorization) is hereby amended by: 
 (i) in clause (k) deleting the word “and” before “(iv)”
therein, 
 (ii) in clause (k), adding the following clause (v) after the word “Agreements)” and before the phrase
“; and” at the end thereof which will permit such transactions to be entered into by the Company without authorization by the Board: 

 “and (v) any transaction entered into with an Affiliate (other than a Controlled Company) in
the ordinary course of business relating to the origination, purchase or other acquisition of, holding, financing, hedging, management and administration of, sale, transfer or other disposition of, any loan, security, credit linked note, hedge, swap
or other derivative contract in which any Stockholder of NewStar is either a party, a counterparty, or a direct or indirect owner or other affiliate of any party or counterparty thereto”, 
 (iii) replacing the proviso at the end thereof with the following which will permit such transfers without Board approval: 
 “provided, that, for purposes of this Section 2.09, any transfer of assets into or from a special purpose funding vehicle or into
or from a fund or other entity that is an Affiliate of the Company shall be deemed to occur in the ordinary course of business. 
 Section 2.10 of the Stockholders’ Agreement (Matters Requiring Investor Authorization) is hereby amended by: 
 (i) in clause (h), deleting the word “and” before “(iv)” therein, 
 (ii) in clause (h), adding the following
clause (v) after the word “Agreements” and before the phrase “; and” at the end thereof which will permit such transactions to be entered into by the Company without consent of the Stockholders: 
 “and (v) any transaction entered into with an Affiliate in the ordinary course of business including, without limitation, (A) any
transaction entered into with an Affiliate which is a special purpose funding vehicle in connection with any repurchase, short term borrowing, warehouse, collateralized loan obligation, collateralized debt obligation or similar financial transaction
or which is a fund or other entity managed by the Company including, without limitation, any transfer of assets or other transaction contemplated in any documents entered into by the Company or any of its Affiliates in connection with any such
transaction and the performance by the Company and any of its Affiliates of their respective obligations thereunder, and (B) any transaction entered into with an Affiliate (other than a “Controlled Company”) relating to the
origination, purchase or other acquisition of, holding, financing, hedging, management and administration of, sale, transfer or other disposition of, any loan, security, credit linked note, hedge, swap or other derivative contract in which any
Stockholder of NewStar is either a party, a counterparty, or a direct or indirect owner or other affiliate of any party or counterparty thereto”, 
 (iii) replacing the proviso at the end of Section 2.10 with the following which will permit such transfers without Stockholder approval: 
 “provided, that, for purposes of this Section 2.10, any transfer of assets into or from a special purpose funding vehicle or into
or from a fund or other entity that is an Affiliate of the Company shall be deemed to occur in the ordinary course of business.” 
  

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 SECTION 2. RATIFICATION AND APPROVAL OF ACTS. 
 The Stockholders hereby ratify and approve each of the following transactions and the performance by the Company and its Affiliates of their respective
obligations in connection therewith and acknowledge that such transactions were or will be entered into with the approval of the Investors holding a majority of the Fully-Diluted Common Stock of the Company: 
 (a) the $50,000,000 short term warehouse facility transaction and the documents entered into with respect thereto by the Company, NewStar Short-Term
Funding LLC, a bankruptcy remote Delaware limited liability company (the “Borrower”), MMP-5 Funding, LLC, Ixis Financial Products Inc and US Bank National Association in which the Company acts as originator, servicer and guarantor and is
the sole owner and designated manager of the Borrower. 
 (b) the collateralized loan obligation transaction and the documents entered into
with respect thereto by the Company, NewStar LLC 2005-1, a bankruptcy remote Delaware limited liability company (the “Trust Depositor”), and NewStar Trust 2005-1, a bankruptcy remote Delaware statutory trust (the “CLO Issuer”)
pursuant to which the CLO Issuer issued U.S. $375,000,000 of Notes and with respect to which (i) the Company acts as originator and servicer and is the sole owner and designated manager of the Trust Depositor and (ii) the Trust Depositor
owns all of the beneficial interests in the CLO Issuer and a portion of its Class E Notes; and 
 (c) the formation of NewStar Credit
Opportunities Fund, Ltd., an exempted company organized under the laws of the Cayman Islands (the “Fund”), and the documents entered into with respect thereto by the Company as manager of the Fund. 
 SECTION 3. AGREEMENT IN FULL FORCE AND EFFECT AS AMENDED. 
 Except as specifically amended hereby, all provisions of the Stockholders’ Agreement shall remain in full force and effect. After this Amendment becomes effective, all references to the Stockholders’
Agreement, “hereof,” “herein,” or words of similar effect referring to the Stockholders’ Agreement shall be deemed to mean the Stockholders’ Agreement as amended hereby. 
 SECTION 4. REPRESENTATIONS AND WARRANTIES. 
 Each of the parties to this Amendment represents and warrants with respect to itself as of the date of this Amendment that 
 (a) the execution, delivery and performance by it of this Amendment are within its powers, have been duly authorized, and do not contravene (i) its organizational documents, or (ii) any law applicable to it;

 (b) this Amendment has been duly executed and delivered by it; and 
  

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 (c) this Amendment constitutes its legal, valid and binding obligation enforceable against it in
accordance with its terms, except as enforceability may be limited by applicable bankruptcy, insolvency, reorganization, moratorium or similar laws affecting the enforcement of creditors’ rights generally or by general principles of equity.

 SECTION 5. MISCELLANEOUS. 
 (a) This Amendment may be executed in any number of counterparts (including by facsimile), and by the different parties hereto on the same or separate counterparts, each of which shall be deemed to be an original
instrument but all of which together shall constitute one and the same agreement. 
 (b) The descriptive headings of the various sections of
this Amendment are inserted for convenience of reference only and shall not be deemed to affect the meaning or construction of any of the provisions hereof. 
 (c) THIS AMENDMENT AND THE RIGHTS AND OBLIGATIONS OF THE PARTIES UNDER THIS AMENDMENT SHALL BE GOVERNED BY AND CONSTRUED AND INTERPRETED IN ACCORDANCE WITH THE LAWS OF THE STATE OF DELAWARE, WITHOUT REGARD TO THE
CONFLICTS OF LAWS RULES OF SUCH STATE. 
 [Remainder of Page Intentionally Left Blank] 
  

 4 

 IN WITNESS WHEREOF, the parties have caused this Amendment to be executed by their respective
officers thereunto duly authorized, as of the date first above written. 
  

			
	NEWSTAR FINANCIAL, INC.
		
	By:	 	/S/ JOHN KIRBY BRAY
		 	 Name: John Kirby Bray
 Title: Responsible Officer

  

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

  

			
	 SHAWMUT EQUITY PARTNERS L.P.
  
 By: Shawmut Capital Partners, LLC,
         its General Partner

		
	By:	 	 /S/ DANIEL K. DOYLE

		 	 Name: Daniel K. Doyle
 Title: Managing Director

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

  

			
	THE NORTHWESTERN MUTUAL LIFE INSURANCE CORPORATION
		
	By:	 	/S/ JEFFREY J. LUEKEN
		 	 Name: Jeffrey J. Lueken
 Title: Its Authorized Representative

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

  

			
	 CAPITAL Z FINANCIAL SERVICES FUND II, L.P.
  
 By: Capital Z Partners, L.P.,
         its general partner
  
 By: Capital Z Partners, Ltd.,
         its general
partner

		
	By:	 	/S/ ILLEGIBLE
		 	 Name:
 Title:

  
  

			
	 CAPITAL Z FINANCIAL SERVICES PRIVATE FUND II, L.P.
  
 By: Capital Z Partners, L.P.,
         its general partner
  
 By: Capital Z Partners, Ltd.,
         its general partner

		
	By:	 	/S/ ILLEGIBLE
		 	 Name:
 Title:

  

			
	CAPITAL Z INVESTMENTS, LLC
		
	By:	 	 /S/ ILLEGIBLE

		 	 Name:
 Title:

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

  

			
	 J.P. MORGAN CAPITAL, L.P.
  
 By: J.P. Morgan Capital Management Company,
         L.P., as General Partner
  
 By: J.P. Morgan Capital Management Company,
         L.L.C., as
General Partner
  
 By: J.P. Morgan Investment
Partners,
         L.P., as Sole Member
  
 By: J.P. Morgan Capital
         Corporation, as General
         Partner

		
	By:	 	/S/    SCOTT
KRAEMER        
		 	 Name: Scott Kraemer
 Title: Vice President and Assistant Secretary

  

			
	 J.P. MORGAN CORSAIR II CAPITAL PARTNERS, L.P.
  
 By: Corsair II, L.P., as General Partner
  
 By: Corsair II, L.L.C., as General Partner

		
	By:	 	/S/    T. KIMBALL BROOKER,
JR.        
		 	 Name: T. Kimball Brooker, Jr.
 Title: Chief Investment Officer

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

  

			
	 OZ MASTER FUND, LTD.
  
 By: OZ Management, L.L.C.,
         its investment manager

		
	By:	 	/S/ ILLEGIBLE
		 	 Name:
 Title:

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