Document:

EX-4.2

 Exhibit 4.2 

EXECUTION VERSION 

INDEPENDENT BANK GROUP, INC. 

and 
 WELLS FARGO BANK,
NATIONAL ASSOCIATION 
 as Trustee 

THIRD SUPPLEMENTAL INDENTURE 

Dated as of September 15. 2020 

to 
 SUBORDINATED DEBT
INDENTURE 
 Dated as of June 25, 2014 

4.00% Fixed-to-Floating Rate Subordinated Notes Due 2030

  

 TABLE OF CONTENTS 

 

							
	 Article 1
	 	DEFINITIONS	  	 	1	 
			
	 Section 1.01.
	 	Relation to Base Indenture	  	 	1	 
	 Section 1.02.
	 	Definition of Terms	  	 	2	 
			
	 Article 2
	 	ESTABLISHMENT OF THE 2030 SERIES AND GENERAL TERMS AND CONDITIONS OF THE NOTES	  	 	11	 
			
	 Section 2.01.
	 	Establishment of the Series of the Notes and Designation	  	 	11	 
	 Section 2.02.
	 	Maturity	  	 	12	 
	 Section 2.03.
	 	Form, Payment and Appointment	  	 	12	 
	 Section 2.04.
	 	Global Note	  	 	12	 
	 Section 2.05.
	 	Interest	  	 	13	 
	 Section 2.06.
	 	Subordination	  	 	17	 
	 Section 2.07.
	 	Events of Default; Acceleration	  	 	22	 
	 Section 2.08.
	 	No Sinking Fund	  	 	22	 
	 Section 2.09.
	 	No Conversion or Exchange Rights	  	 	22	 
	 Section 2.10.
	 	No Defeasance or Covenant Defeasance	  	 	22	 
			
	 Article 3
	 	REDEMPTION OF THE NOTES	  	 	22	 
			
	 Section 3.01.
	 	Optional Redemption	  	 	22	 
	 Section 3.02.
	 	Redemption of Special Events	  	 	22	 
	 Section 3.03.
	 	Notice to Trustee	  	 	23	 
	 Section 3.04.
	 	Partial Redemption	  	 	23	 
	 Section 3.05.
	 	Notice to Holders	  	 	23	 
			
	 Article 4
	 	FORM OF NOTES	  	 	24	 
			
	 Section 4.01.
	 	Form of Notes	  	 	24	 
			
	 Article 5
	 	SUPPLEMENTAL INDENTURES	  	 	25	 
			
	 Section 5.01.
	 	Supplemental Indentures without Consent of Holders	  	 	25	 
			
	 Article 6
	 	IMMUNITY OF STOCKHOLDERS, EMPLOYEES, AGENTS, OFFICERS AND DIRECTORS	  	 	25	 
			
	 Section 6.01.
	 	Indenture and Notes Solely Corporate Obligations	  	 	25	 

  
 i 

							
	 Article 7
	 	MISCELLANEOUS	  	 	25	 
			
	 Section 7.01.
	 	Ratification of Base Indenture	  	 	25	 
	 Section 7.02.
	 	Trustee Not Responsible for Recitals	  	 	25	 
	 Section 7.03.
	 	Texas Law To Govern	  	 	25	 
	 Section 7.04.
	 	Severability	  	 	25	 
	 Section 7.05.
	 	Counterparts	  	 	26	 
	 Section 7.06.
	 	Benefits of Third Supplemental Indenture	  	 	26	 
	 Section 7.07.
	 	Conflict with Base Indenture	  	 	26	 
	 Section 7.08.
	 	Provisions of Trust Indenture Act Controlling	  	 	26	 
	 Section 7.09.
	 	Successors	  	 	26	 

  
 ii 

 THIS THIRD SUPPLEMENTAL INDENTURE (this “Third Supplemental
Indenture”), dated as of September 15, 2020, between INDEPENDENT BANK GROUP, INC., a corporation duly organized and existing under the laws of the State of Texas (the “Company”), and WELLS FARGO BANK, NATIONAL
ASSOCIATION, a national banking association duly organized and existing under the laws of the United States, as Trustee (the “Trustee”), under the Base Indenture (as hereinafter defined). 

RECITALS 
 WHEREAS,
the Company and the Trustee have heretofore executed and delivered the Subordinated Debt Indenture, dated as of June 25, 2014 (the “Base Indenture” and, as hereby supplemented and amended, the “Indenture”),
providing for the establishment from time to time of Series of the Company’s subordinated unsecured debt securities, which may be notes, bonds, debentures or other evidences of indebtedness of the Company (hereinafter called the
“Securities”), and the issuance by the Company from time to time of Securities under the Indenture; 
 WHEREAS,
Section 901(4) of the Base Indenture provides that the Company and the Trustee may enter into an indenture supplemental to the Base Indenture to establish a Series of Securities thereunder and the form and terms, provisions and conditions of
Securities of such Series of Securities as permitted by Section 201 and Section 301 of the Base Indenture; 
 WHEREAS,
pursuant to Section 301 of the Base Indenture, the Company desires to establish a new Series of Securities under the Indenture to be known as its “4.00%
Fixed-to-Floating Rate Subordinated Notes Due 2030” (the “2030 Series”) and to establish and set the form and terms, provisions and conditions of
the notes of the 2030 Series (the “Notes”), as provided in this Third Supplemental Indenture and to provide for the initial issuance of Notes of the 2030 Series in the aggregate principal amount of $130,000,000; and 

WHEREAS, the Company has requested that the Trustee execute and deliver this Third Supplemental Indenture; and the Company confirms all
requirements necessary to make this Third Supplemental Indenture a valid, binding and enforceable instrument in accordance with its terms, and to make the Notes, when executed by the Company and authenticated and delivered by the Trustee in
accordance with this Indenture, the valid, binding and enforceable obligations of the Company, have been satisfied; and the execution and delivery of this Third Supplemental Indenture has been duly authorized in all respects. 

NOW, THEREFORE, in consideration of the covenants and agreements set forth herein and for other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, the parties hereto hereby agree as follows: 
 ARTICLE 1 

DEFINITIONS 
 Section 1.01.
Relation to Base Indenture. This Third Supplemental Indenture constitutes an integral part of, and amends and supplements, the Base Indenture as set forth herein. 

  
 1 

 Section 1.02. Definition of Terms. For all purposes of this Third Supplemental Indenture: 

 

	 	(a)	 Capitalized terms used herein without definition shall have the meanings set forth in the Base Indenture,
provided that if the definition of a capitalized term defined in this Third Supplemental Indenture conflicts with the definition of that capitalized term in the Base Indenture, the definition of that capitalized term in this Third Supplemental
Indenture shall control for purposes of this Third Supplemental Indenture and the Notes; 

  

	 	(b)	 a term defined anywhere in this Third Supplemental Indenture has the same meaning throughout this Third
Supplemental Indenture; 

  

	 	(c)	 the singular includes the plural and vice versa; 

 

	 	(d)	 headings are for convenience of reference only and do not affect interpretation; 

 

	 	(e)	 unless otherwise specified or unless the context requires otherwise, (i) all references in this Third
Supplemental Indenture to Sections refer to the corresponding Sections of this Third Supplemental Indenture and (ii) the terms “herein,” “hereof,” “hereunder” and any other word of similar import refer to this
Third Supplemental Indenture; and 

  

	 	(f)	 for purposes of this Third Supplemental Indenture and the Notes, the following terms have the meanings given to
them in this Section 1.02(f): 

 “2030 Series” shall have the meaning set forth
in the Recitals. 
 “Base Indenture” shall have the meaning set forth in the Recitals. 

“Benchmark” means, initially, Three-Month Term SOFR; provided that, if the Calculation Agent determines on or prior to the
Reference Time for any Floating Rate Interest Period that a Benchmark Transition Event and its related Benchmark Replacement Date have occurred with respect to Three-Month Term SOFR or the then-current Benchmark, then “Benchmark” means the
applicable Benchmark Replacement for such Floating Rate Interest Period and any subsequent Floating Rate Interest Periods. 

“Benchmark Replacement” means the Interpolated Benchmark with respect to the then-current Benchmark, plus the Benchmark
Replacement Adjustment for such Benchmark; provided that if (a) the Calculation Agent cannot determine the Interpolated Benchmark as of the Benchmark Replacement Date or (b) the then-current Benchmark is Three-Month Term SOFR and a
Benchmark Transition Event and its related Benchmark Replacement Date have occurred with respect to Three-Month Term SOFR (in which event no Interpolated Benchmark with respect to Three-Month Term SOFR shall be determined), then “Benchmark
Replacement” means the first alternative set forth in the order below that can be determined by the Calculation Agent as of the Benchmark Replacement Date: 
  

	 	(1)	 Compounded SOFR; 

  
 2 

	 	(2)	 the sum of: (a) the alternate rate that has been selected or recommended by the Relevant Governmental Body
as the replacement for the then-current Benchmark for the applicable Corresponding Tenor and (b) the Benchmark Replacement Adjustment; 

  

	 	(3)	 the sum of: (a) the ISDA Fallback Rate and (b) the Benchmark Replacement Adjustment;

  

	 	(4)	 the sum of: (a) the alternate rate that has been selected by the Calculation Agent as the replacement for
the then-current Benchmark for the applicable Corresponding Tenor, giving due consideration to any industry-accepted rate as a replacement for the then-current Benchmark for Dollar-denominated floating rate securities at such time, and (b) the
Benchmark Replacement Adjustment. 

 “Benchmark Replacement Adjustment” means the first alternative set
forth in the order below that can be determined by the Calculation Agent as of the Benchmark Replacement Date: 
  

	 	(1)	 the spread adjustment, or method for calculating or determining such spread adjustment (which may be a positive
or negative value or zero), that has been selected or recommended by the Relevant Governmental Body for the applicable Unadjusted Benchmark Replacement; 

  

	 	(2)	 if the applicable Unadjusted Benchmark Replacement is equivalent to the ISDA Fallback Rate, then the ISDA
Fallback Adjustment; and 

  

	 	(3)	 the spread adjustment (which may be a positive or negative value or zero) that has been selected by the
Calculation Agent giving due consideration to any industry-accepted spread adjustment or method for calculating or determining such spread adjustment, for the replacement of the then-current Benchmark with the applicable Unadjusted Benchmark
Replacement for Dollar-denominated floating rate securities at such time. 

 “Benchmark Replacement Conforming
Changes” means, with respect to any Benchmark Replacement, any technical, administrative, or operational changes (including, without limitation, changes to the definition of “Floating Rate Interest Period,” timing and frequency of
determining rates with respect to each Floating Rate Interest Period and making payments of interest, rounding of amounts or tenors, and other administrative matters) that the Calculation Agent determines may be appropriate to reflect the adoption
of such Benchmark Replacement in a manner substantially consistent with market practice (or, if the Calculation Agent determines that adoption of any portion of such market practice is not administratively feasible or if the Calculation Agent
determines that no market practice for use of the Benchmark Replacement exists, in such other manner as the Calculation Agent determines is reasonably necessary). 

“Benchmark Replacement Date” means the earliest to occur of the following events with respect to the then-current Benchmark:

  
 3 

	 	(1)	 in the case of clause (1) of the definition of “Benchmark Transition Event,” the relevant
Reference Time in respect of any determination; 

  

	 	(2)	 in the case of clause (2) or (3) of the definition of “Benchmark Transition Event,” the later of
the date of the public statement or publication of information referenced therein and the date on which the administrator of the Benchmark permanently or indefinitely ceases to provide the Benchmark; or 

 

	 	(3)	 in the case of clause (4) of the definition of “Benchmark Transition Event,” the date of the
public statement or publication of information referenced therein. 

 For the avoidance of doubt, if the event giving rise
to the Benchmark Replacement Date occurs on the same day as, but earlier than, the Reference Time in respect of any determination, the Benchmark Replacement Date will be deemed to have occurred prior to the Reference Time for such determination.

 “Benchmark Transition Event” means the occurrence of one or more of the following events with respect to the then-current
Benchmark: 
  

	 	(1)	 if the Benchmark is Three-Month Term SOFR, (a) the Relevant Governmental Body has not selected or
recommended a forward-looking term rate for a tenor of three months based on SOFR, (b) the development of a forward-looking term rate for a tenor of three months based on SOFR that has been recommended or selected by the Relevant Governmental
Body is not complete or (c) the Company determines that the use of a forward-looking rate for a tenor of three months based on SOFR is not administratively feasible; 

 

	 	(2)	 a public statement or publication of information by or on behalf of the administrator of the Benchmark
announcing that such administrator has ceased or will cease to provide the Benchmark, permanently or indefinitely, provided that, at the time of such statement or publication, there is no successor administrator that will continue to provide the
Benchmark; 

  

	 	(3)	 a public statement or publication of information by the regulatory supervisor for the administrator of the
Benchmark, the central bank for the currency of the Benchmark, an insolvency official with jurisdiction over the administrator for the Benchmark, a resolution authority with jurisdiction over the administrator for the Benchmark or a court or an
entity with similar insolvency or resolution authority over the administrator for the Benchmark, which states that the administrator of the Benchmark has ceased or will cease to provide the Benchmark permanently or indefinitely, provided that, at
the time of such statement or publication, there is no successor administrator that will continue to provide the Benchmark; or 

  
 4 

	 	(4)	 a public statement or publication of information by the regulatory supervisor for the administrator of the
Benchmark announcing that the Benchmark is no longer representative. 

 “Business Day” means any day,
other than a Saturday or Sunday, that is neither a legal holiday nor a day on which banking institutions in the City of New York or any Place of Payment are authorized or required by law, regulation, or executive order to close. 

“Calculation Agent” means the Person appointed by the Company prior to the commencement of the Floating Rate Period (which may
include the Company or any of its Affiliates) to act in accordance with Section 2.05. The Company shall initially act as the Calculation Agent. 

“Company” shall have the meaning set forth in the Preamble. 

“Compounded SOFR” means the compounded average of SOFRs for the applicable Corresponding Tenor, with the rate, or
methodology for this rate, and conventions for this rate being established by the Calculation Agent in accordance with: 
  

	 	(1)	 the rate, or methodology for this rate, and conventions for this rate selected or recommended by the Relevant
Governmental Body for determining Compounded SOFR; provided that: 

  

	 	(2)	 if, and to the extent that, the Calculation Agent determines that Compounded SOFR cannot be determined in
accordance with clause (1) above, then the rate, or methodology for this rate, and conventions for this rate that have been selected by the Calculation Agent giving due consideration to any industry-accepted market practice for
Dollar-denominated floating rate securities at such time. 

 For the avoidance of doubt, the calculation of Compounded SOFR
shall exclude the Benchmark Replacement Adjustment and the spread specified herein. 
 “Corresponding Tenor” means
(i) with respect to Term SOFR, three months, and (ii) with respect to a Benchmark Replacement, a tenor (including overnight) having approximately the same length (disregarding business day adjustment) as the applicable tenor for the
then-current Benchmark. 
 “DTC” shall have the meaning set forth in Section 2.03 hereof. 

“Existing Company Subordinated Indebtedness” means the Company’s 5.875% Subordinated Notes due August 1, 2024 and
5.00% Fixed-to-Floating Rate Subordinated Notes due December 31, 2027. 

  
 5 

 “Federal Reserve Board” means the Board of Governors of the Federal Reserve
System or any successor regulatory authority with jurisdiction over bank holding companies. 
 “Fixed Rate Interest Payment
Date” shall have the meaning set forth in Section 2.05(a) hereof. 
 “Fixed Rate Period”
shall have the meaning set forth in Section 2.05(a) hereof. 
 “Floating Period Interest Payment
Date” shall have the meaning set forth in Section 2.05(b) hereof. 
 “Floating Rate Interest
Period” means the period from and including the immediately preceding Floating Period Interest Payment Date in respect of which interest has been paid or duly provided for, to, but excluding, the applicable Floating Period Interest Payment
Date or Maturity Date or Redemption Date, if applicable (except that the first Floating Rate Interest Period will commence on September 15, 2025). 

“Floating Rate Period” shall have the meaning set forth in Section 2.05(b) hereof. 

“FRBNY’s Website” means the website of the Federal Reserve Bank of New York (the “FRBNY”) at
http://www.newyorkfed.org, or any successor source. 
 “Global Note” shall have the meaning set forth in
Section 2.04 hereof. 
 “Indenture” shall have the meaning set forth in the Recitals. 

“Independent Bank Regulatory Counsel” means a law firm, a member of a law firm or an independent practitioner that is
experienced in matters of federal bank holding company and banking regulatory law, including the laws, rules and guidelines of the Federal Reserve Board relating to regulatory capital, and shall include any Person who, under the standards of
professional conduct then prevailing and applicable to such counsel, would not have a conflict of interest in representing the Company or the Trustee in connection with providing the legal opinion contemplated by the definition of the term
“Tier 2 Capital Event.” 
 “Independent Tax Counsel” means a law firm, a member of a law firm or an independent
practitioner that is experienced in matters of federal income taxation law, including the deductibility of interest payments made with respect to corporate debt instruments, and shall include any Person who, under the standards of professional
conduct then prevailing and applicable to such counsel, would not have a conflict of interest in representing the Company or the Trustee in connection with providing the legal opinion contemplated by the definition of the term “Tax Event.”

 “Interest Payment Date” shall have the meaning set forth in Section 2.05(b) hereof. 

“Interpolated Benchmark” with respect to the Benchmark means the rate determined by the Calculation Agent for the
Corresponding Tenor by interpolating on a linear basis between: (1) the Benchmark for the longest period (for which the Benchmark is available) that is shorter than the Corresponding Tenor, and (2) the Benchmark for the shortest period
(for which the Benchmark is available) that is longer than the Corresponding Tenor. 

  
 6 

 “ISDA” means the International Swaps and Derivatives Association, Inc. or
any successor. 
 “ISDA Definitions” means the 2006 ISDA Definitions published by ISDA, as amended or supplemented from time
to time, or any successor definitional booklet for interest rate derivatives published from time to time. 
 “ISDA Fallback
Adjustment” means the spread adjustment (which may be a positive or negative value or zero) that would apply for derivatives transactions referencing the ISDA Definitions to be determined upon the occurrence of an index cessation event with
respect to the Benchmark for the applicable tenor. 
 “ISDA Fallback Rate” means the rate that would apply for derivatives
transactions referencing the ISDA Definitions to be effective upon the occurrence of an index cessation date with respect to the Benchmark for the applicable tenor excluding the applicable ISDA Fallback Adjustment. 

“Maturity Date” shall have the meaning set forth in Section 2.02 hereof. 

“Notes” shall have the meaning set forth in the Recitals. 

“Optional Redemption” shall have the meaning set forth in Section 3.01 hereof. 

“Redemption Date” means each date, if any, on which Notes are redeemed pursuant to the redemption provisions of
Section 3.01 or Section 3.02 hereof. 
 “Reference Time” with respect to
any determination of the Benchmark means (i) if the Benchmark is Three-Month Term SOFR, the time determined by the Calculation Agent after giving effect to the Three-Month Term SOFR Conventions, and (ii) if the Benchmark is not Three-Month
Term SOFR, the time determined by the Calculation Agent after giving effect to the Benchmark Replacement Conforming Changes. 

“Relevant Governmental Body” means the Federal Reserve Board and/or the FRBNY, or a committee officially endorsed or convened
by the Federal Reserve Board and/or the FRBNY or any successor thereto. 
 “Securities” shall have the meaning set forth in
the Recitals. 
 “Senior Indebtedness” means the principal of, and premium, if any, and interest, including interest
accruing after the commencement of any bankruptcy proceeding relating to the Company, on, or substantially similar payments the Company makes in respect of the following categories of debt, whether that debt is outstanding on the date of execution
of this Third Supplemental Indenture or thereafter incurred, created or assumed: 
  

	 	(1)	 the indebtedness that may be incurred, currently in the amount of up to $100.0 million, pursuant to the
Company’s revolving credit facility for which U.S. Bank, National Association is the administrative agent and any renewal or extension thereof or any new facility replacing or refinancing such revolving credit facility; 

  
 7 

	 	(2)	 other indebtedness evidenced by notes, debentures, or bonds or other securities issued under the provisions of
any indenture, fiscal agency agreement, debenture or note purchase agreement or other agreement, including any senior debt securities that may be offered, including by means of a base prospectus and one or more prospectus supplements;

  

	 	(3)	 indebtedness for money borrowed or represented by purchase-money obligations, as defined below;

  

	 	(4)	 indebtedness to general creditors; 

 

	 	(5)	 obligations as lessee under leases of property whether made as part of a sale and leaseback transaction to
which the Company is a party or otherwise; 

  

	 	(6)	 indebtedness, obligations and liabilities of others in respect of which the Company is liable contingently or
otherwise to pay or advance money or property or as guarantor, endorser or otherwise or which the Company has agreed to purchase or otherwise acquire and indebtedness of partnerships and joint ventures that is included in the Company’s
consolidated financial statements; 

  

	 	(7)	 reimbursement and other obligations relating to letters of credit, bankers’ acceptances and similar
obligations; 

  

	 	(8)	 obligations under various hedging arrangements and agreements, including interest rate and currency hedging
agreements and swap and nonswap forward agreements; 

  

	 	(9)	 all of the Company’s obligations issued or assumed as the deferred purchase price of property or services,
but excluding trade accounts payable and accrued liabilities arising in the ordinary course of business; and 

  

	 	(10)	 deferrals, renewals or extensions of any of the indebtedness or obligations described in the clauses above.

  
 8 

 However, “Senior Indebtedness” excludes: 

 

	 	(1)	 any indebtedness, obligation or liability referred to in the definition of Senior Indebtedness above as to
which, in the instrument creating, governing or evidencing that indebtedness, obligation or liability, it is expressly provided that such indebtedness, obligation or liability is not senior in right of payment to, is junior in right of payment to,
or ranks equally in right of payment with, other specified types of indebtedness, obligations and liabilities of the Company, which other specified types of indebtedness, obligations and liabilities of the Company include the Notes;

  

	 	(2)	 any indebtedness, obligation or liability that is subordinated to other of the Company’s indebtedness,
obligations or liabilities to substantially the same extent as or to a greater extent than the Notes are subordinated; 

  

	 	(3)	 all obligations to trade creditors created or assumed by the Company in the ordinary course of business; and

  

	 	(4)	 the Notes and any other securities issued pursuant to the Indenture and the Company’s outstanding junior
subordinated debentures and, unless expressly provided in the terms thereof, any of the Company’s indebtedness to the Company’s subsidiaries. 

As used above, the term “purchase-money obligations” means indebtedness, obligations evidenced by a note, debenture, bond or other
instrument, whether or not secured by a lien or other security interest, issued to evidence the obligation to pay or a guarantee of the payment of, and any deferred obligation for the payment of, the purchase price of property but excluding
indebtedness or obligations for which recourse is limited to the property purchased, issued or assumed as all or a part of the consideration for the acquisition of property or services, whether by purchase, merger, consolidation or otherwise, but
does not include any trade accounts payable. 
 Notwithstanding the foregoing, if the Federal Reserve Board (or other competent regulatory
agency or authority) promulgates any rule or issues any interpretation that defines general creditor(s), the main purpose of which is to establish criteria for determining whether the subordinated debt of a bank holding company is to be included in
its capital, then the term “general creditors” as used in this definition of  “Senior Indebtedness” in this Third Supplemental Indenture will have the meaning as described in that rule or interpretation. 

“SOFR” means the secured overnight financing rate published by the FRBNY, as the administrator of the Benchmark (or any
successor administrator), on the FRBNY’s Website. 
 “Tax Event” shall mean the receipt by the Company of an opinion of
Independent Tax Counsel to the effect that: 
  

	 	(1)	 an amendment to or change (including any announced prospective amendment or change) in any law, treaty, statute
or code, or any regulation thereunder, of the United States or any of its political subdivisions or taxing authorities; 

  
 9 

	 	(2)	 a judicial decision, administrative action, official administrative pronouncement, ruling, regulatory
procedure, regulation, notice or announcement, including any notice or announcement of intent to adopt or promulgate any ruling, regulatory procedure or regulation (any of the foregoing, an “administrative or judicial action”);

  

	 	(3)	 an amendment to or change in any official position with respect to, or any interpretation of, an administrative
or judicial action or a law or regulation of the United States that differs from the previously generally accepted position or interpretation; or 

  

	 	(4)	 a threatened challenge asserted in writing in connection with an audit of the Company’s federal income tax
returns or positions or a similar audit of any of its Subsidiaries, or a publicly known threatened challenge asserted in writing against any other taxpayer that has raised capital through the issuance of securities that are substantially similar to
the Notes, 

 in each case, occurring or becoming publicly known on or after the date of original issuance of the Notes,
has resulted in more than an insubstantial increase in the risk that the interest paid by the Company on the Notes is not, or within 90 days of receipt of such opinion of tax counsel, will not be, deductible by the Company, in whole or in part, for
U.S. federal income tax purposes. 
 “Term SOFR” means the forward-looking term rate for the applicable Corresponding Tenor
based on SOFR that has been selected or recommended by the Relevant Governmental Body. 
 “Term SOFR Administrator” means
any entity designated by the Relevant Governmental Body as the administrator of Term SOFR (or any successor administrator). 
 “Third
Supplemental Indenture” shall have the meaning set forth in the Preamble. 
 “Three-Month Term SOFR” means the rate
for Term SOFR for a tenor of three months that is published by the Term SOFR Administrator at the Reference Time for any Floating Rate Interest Period, as determined by the Calculation Agent after giving effect to the Three-Month Term SOFR
Conventions. All percentages used in or resulting from any calculation of Three-Month Term SOFR shall be rounded, if necessary, to the nearest one-hundred-thousandth of a percentage point, with 0.000005%
rounded up to 0.00001%. 
 “Three-Month Term SOFR Conventions” means any determination, decision, or election with respect
to any technical, administrative, or operational matter (including with respect to the manner and timing of the publication of Three-Month Term SOFR, or changes to the definition of “Floating Rate Interest Period,” timing and frequency of
determining Three-Month Term SOFR with respect to each Floating Rate Interest Period and making payments of interest, rounding of amounts or tenors, and other administrative matters) that the Calculation Agent determines may be appropriate to
reflect the use of Three-Month Term SOFR as the Benchmark in a manner substantially consistent with market practice (or, if the Calculation Agent determines that adoption of any portion of such market practice is not administratively feasible or if
the Calculation Agent determines that no market practice for the use of Three-Month Term SOFR exists, in such other manner as the Calculation Agent determines is reasonably necessary). 

  
 10 

 “Tier 2 Capital Event” shall mean the receipt by the Company of an opinion
of Independent Bank Regulatory Counsel to the effect that, as a result of (a) any amendment to, or change (including any announced prospective change) in, the laws or any regulations thereunder of the United States or any rules, guidelines or
policies of an applicable regulatory authority for the Company or (b) any official administrative pronouncement or judicial decision interpreting or applying such laws or regulations, which amendment or change is effective or which
pronouncement or decision is announced on or after the date of original issuance of the Notes, the Notes do not constitute, or within 90 days of the date of such opinion will not constitute, Tier 2 capital (or its then equivalent if the Company were
subject to such capital requirement) for purposes of capital adequacy guidelines of the Federal Reserve Board (or any successor regulatory authority with jurisdiction over bank holding companies), as then in effect and applicable to the Company.

 “Trustee” shall have the meaning set forth in the Preamble. 

“Unadjusted Benchmark Replacement” means the Benchmark Replacement excluding the Benchmark Replacement Adjustment. 

ARTICLE 2 
 ESTABLISHMENT
OF THE 2030 SERIES AND 
 GENERAL TERMS AND CONDITIONS OF THE NOTES 

Section 2.01. Establishment of the Series of the Notes and Designation. 
  

	 	(a)	 There is hereby authorized and established a Series of Securities designated as the “4.00% Fixed-to-Floating Rate Subordinated Notes Due 2030,” which Series of Securities is unsecured, subordinated to the Senior Indebtedness of the Company as provided herein
and unlimited in the aggregate principal amount that may be issued. The Notes initially issued pursuant to the terms of the Indenture shall be in an aggregate principal amount of $130,000,000, which amount shall be set forth in a Company Order
pursuant to Article 2 of the Base Indenture, and the Trustee shall thereupon authenticate and deliver said Notes in accordance with such Company Order and the Indenture, including Section 303 of the Base Indenture. The Securities that are a
part of such Series of Securities shall be in the form and have the terms, provisions and conditions as set forth in the Base Indenture, this Third Supplemental Indenture and the Notes in the form attached hereto as Exhibit A.

  
 11 

	 	(b)	 The Company may, from time to time, without notice to, or the consent of, the Holders of the Notes, issue
additional Securities ranking equally with the Notes and identical to the Notes issued on the date hereof in all respects (except for the issue date, the offering price, the payment of interest accruing prior to the issue date of such additional
Securities and the first payment of interest following the issue date of such additional Securities) in order that such additional Securities may be consolidated and form a single series with the Notes and have the same terms as to status,
redemption or otherwise as the Notes. However, any additional Securities of the series of which the Notes are a part that are issued and are not fungible with the outstanding Notes of such series for United States federal income tax purposes will be
issued under one or more separate CUSIP numbers and ISIN numbers. No limit exists on the aggregate principal amount of the additional Securities of this series that the Company may issue in the future. 

Section 2.02. Maturity. The date upon which the Notes shall become due and payable at final maturity, together with any accrued and unpaid
interest then owing, is September 15, 2030 (the “Maturity Date”). 
 Section 2.03. Form, Payment and Appointment. Except
as provided in the fourth paragraph of Section 305 of the Base Indenture, the Notes will be issued only in book-entry form, will be represented by one or more Global Notes (as defined below) registered in the name of or held by The Depositary
Trust Company (and any successor organization thereto) (“DTC”) or its nominee. Principal or the Redemption Price, if any, of a Note shall be payable to the Person in whose name that Note is registered on the Maturity Date or
Redemption Date, as the case may be, provided that the Redemption Price, if any, principal of and interest on the Notes represented by one or more Global Notes (as hereinafter defined) registered in the name of or held by DTC or its nominee will be
payable in immediately available funds to DTC or its nominee, as the case may be, as the registered holder of such Global Notes. The principal of any certificated Notes will be payable at the Place of Payment set forth below. 

The Notes shall have such other terms as are set forth in the form thereof attached hereto as Exhibit A, which is incorporated herein and made a part
hereof. 
 The Security Registrar, Authenticating Agent, and Paying Agent for the Notes shall initially be the Trustee. The Company will appoint a Person to
act as the Calculation Agent as provided under the definition of Calculation Agent and Section 2.05. 
 The Place of Payment for
the Notes shall be an office or agency of the Company maintained for such purpose, which shall initially be the Corporate Trust Office of the Paying Agent in Los Angeles, California. 

The Notes will be issued and may be transferred only in denominations of $1,000 or any amount in excess thereof that is an integral multiple of $1,000. The
Company will pay principal of and interest on the Notes in Dollars. 
 Section 2.04. Global Note. The Notes shall be issued initially in the
form of one or more fully registered global notes (each such global note, a “Global Note”) registered in the name of DTC or its nominee and deposited with DTC or its designated custodian or such other Depositary as any Officer of
the Company may from time to time designate. Unless and until a Global Note is exchanged for definitive certificated Notes, such Global Note may be transferred, in whole but not in part, and any payments on the Notes shall be made, only to DTC or a
nominee of DTC, or to a successor Depositary selected or approved by the Company or to a nominee of such successor Depositary as provided in the Indenture. 

  
 12 

 Section 2.05. Interest. 

 

	 	(a)	 From and including September 15, 2020, to, but excluding, September 15, 2025 (unless redeemed prior
to such date pursuant to Section 3.02 hereof) (the “Fixed Rate Period”), the Notes will bear interest at a rate of 4.00% per year. During the Fixed Rate Period, interest on the Notes will accrue from and
including September 15, 2020, and will be payable semiannually in arrears on March 15 and September 15 of each year during the Fixed Rate Period, commencing on March 15, 2021 (each such date, a “Fixed Period Interest
Payment Date”). The interest payable on the Notes on any Fixed Period Interest Payment Date will be paid to the Holder at the close of business on March 1 or September 1 (whether or not a Business Day) immediately preceding the
Fixed Period Interest Payment Date. 

  

	 	(b)	 From and including September 15, 2025, to, but excluding, the Maturity Date (unless redeemed prior to such
date pursuant to Section 3.01 or Section 3.02 hereof) (the “Floating Rate Period”), the Notes will bear interest at a floating rate per year equal to the Benchmark, plus 388.50
basis points. During the Floating Rate Period, interest on the Notes will accrue from and including September 15, 2025 and will be payable quarterly in arrears on March 15, June 15, September 15 and December 15 of each year,
commencing on December 15, 2025 (each such date, a “Floating Period Interest Payment Date” and, together with a Fixed Period Interest Payment Date, an “Interest Payment Date”). The interest payable on the Notes
on any Floating Period Interest Payment Date will, except as noted in the immediately succeeding sentence, be paid to the Holder at the close of business on March 1, June 1, September 1 or December 1 (whether or not a Business
Day) immediately preceding the Floating Period Interest Payment Date. However, interest that the Company pays on the Maturity Date will be paid to the Person to whom the principal will be payable. Notwithstanding the foregoing, if the Benchmark is
less than zero, then the Benchmark shall be deemed to be zero. The Calculation Agent will provide the Company and the Trustee with written notice of the interest rate in effect on the Notes promptly after the Reference Time (or such other date of
determination for the applicable Benchmark). 

  

	 	(c)	 During the Fixed Rate Period, interest will be computed on the basis of a
360-day year consisting of twelve 30-day months. During the Floating Rate Period, interest will be computed on the basis of a
360-day year and the actual number of days elapsed. Dollar amounts resulting from those calculations will be rounded to the nearest cent, with one-half cent being
rounded upward. 

  

	 	(d)	 The Company or the Calculation Agent, as applicable, shall calculate the amount of interest payable on any
Interest Payment Date and the Trustee shall have no duty to confirm or verify any such calculation. If any Fixed Period Interest Payment Date for the Notes or the date for the payment of principal for the Notes occurring during the Fixed Rate Period
falls on a day that is not a Business Day, 

  
 13 

	 	
the Company will postpone the interest or principal payment to the next succeeding Business Day, but the payments made on such dates will be treated as being made on the date that the payment was
first due and the Holders of the Notes will not be entitled to any further interest, principal or other payments with respect to such postponements. If any Floating Period Interest Payment Date or the Maturity Date falls on a day that is not a
Business Day, the Company will postpone the interest payment or the payment of principal and interest at the Maturity Date to the next succeeding Business Day (and, with respect to the Maturity Date, no additional interest will accrue on the amount
payable for the period from and after the Maturity Date) unless, with respect to a Floating Period Interest Payment Date only, such day falls in the next calendar month, in which case the Floating Period Interest Payment Date will instead be the
immediately preceding day that is a Business Day, and interest will accrue to, but excluding, such Floating Period Interest Payment date as so adjusted. 

  

	 	(e)	 The Company shall appoint a Calculation Agent prior to the commencement of the Floating Rate Period. The
Company will act as the initial Calculation Agent. The calculation of the interest rate for any Floating Rate Interest Period by the Calculation Agent will (in the absence of manifest error) be conclusive and binding upon the beneficial owners and
Holders of the Notes, the Company (if the Company is not also the Calculation Agent) and the Trustee. The Calculation Agent’s determination of any interest rate, and its calculation of interest payments, for any Floating Rate Interest Period,
will be maintained on file at the Calculation Agent’s principal offices, will be made available to any Holder of the Notes upon request. The Calculation Agent shall have all the rights, protections and indemnities afforded to the Trustee under
the Indenture. The Calculation Agent may be removed by the Company at any time. If the Calculation Agent is unable or unwilling to act as Calculation Agent or is removed by the Company, the Company will promptly appoint a replacement Calculation
Agent. The Trustee shall not be under any duty to succeed to, assume or otherwise perform, any duties of the Calculation Agent, or to appoint a successor or replacement in the event of the Calculation Agent’s resignation or removal or to
replace the Calculation Agent in the event of a default, breach or failure of performance on the part of the Calculation Agent with respect to the Calculation Agent’s duties and obligations under the Indenture. For the avoidance of doubt, if at
any time there is no Calculation Agent appointed by the Company, then the Company shall be the Calculation Agent. By its acquisition of the Notes, each Holder (including, for the avoidance of doubt, each beneficial owner)
acknowledges, accepts, consents to and agrees to be bound by the Company’s and the Calculation Agent’s determination of the interest rate for each Floating Rate Interest Period, including the Company’s and its
determination of any Benchmark Replacement Conforming Changes, Benchmark Replacement Date, Benchmark Replacement, Benchmark Replacement Adjustment, and Benchmark Transition Event, including as may occur without any prior notice from the Company or
the Calculation Agent and without the need for the Company or it to obtain any further consent from any Holder. 

  
 14 

	 	(f)	 Effect of Benchmark Transition Event. 

 

	 	(1)	 If the Calculation Agent determines that a Benchmark Transition Event and its related Benchmark Replacement
Date have occurred on or prior to the Reference Time in respect of any Floating Rate Interest Period during the Floating Rate Period, then the Benchmark Replacement will replace the then-current Benchmark for all purposes relating to the Notes
during such Floating Rate Interest Period and all remaining Floating Rate Interest Periods. In connection with the implementation of a Benchmark Replacement, the Calculation Agent will have the right to make Benchmark Replacement Conforming Changes
from time to time. 

  

	 	(2)	 Notwithstanding anything set forth in Section 2.05(b) above, if the Calculation Agent
determines on or prior to the relevant Reference Time that a Benchmark Transition Event and its related Benchmark Replacement Date have occurred with respect to Three-Month Term SOFR, then the provisions set forth in this
Section 2.05(f) will thereafter apply to all determinations of the Benchmark used to calculate the interest rate on the Notes for each Floating Rate Interest Period. 

 

	 	(3)	 The Calculation Agent is expressly authorized to make certain determinations, decisions, and elections under
the terms of the Notes, including with respect to the use of Three-Month Term SOFR as the Benchmark for the Floating Rate Period and under this Section 2.05(f). Any determination, decision, or election that may be made by
the Company or by the Calculation Agent under the terms of the Notes, including any determination with respect to a tenor, rate, or adjustment or of the occurrence or non-occurrence of an event, circumstance,
or date and any decision to take or refrain from taking any action or any selection (A) will be conclusive and binding on the Holders of the Notes, the Company (if the Company is not also the Calculation Agent) and the Trustee absent manifest
error, (B) if made by the Company as Calculation Agent, will be made in the Company’s sole discretion, (C) if made by a Calculation Agent other than the Company, will be made after consultation with the Company, and the Calculation
Agent will not make any such determination, decision, or election to which the Company reasonably objects and (D) notwithstanding anything to the contrary in the Indenture, shall become effective without consent from the Holders of the Notes or
the Trustee or any other party. If the Calculation Agent fails to make any determination, decision, or election that it is required to make under the terms of the Notes, then the Company will make such determination, decision, or election on the
same basis as described above. 

  

	 	(4)	 The Company (or the Calculation Agent) shall notify the Trustee in writing (i) upon the occurrence of the
Benchmark Transition Event or the Benchmark Replacement Date, and (ii) of any Benchmark Replacements, Benchmark Replacement Conforming Changes after a Benchmark Transition Event. 

  
 15 

	 	(5)	 The Trustee (including in its capacity as Paying Agent) shall have no (i) responsibility or liability for
the (A) Three-Month Term SOFR Conventions, (B) selection of an alternative reference rate to Three-Month Term SOFR (including, without limitation, whether the conditions for the designation of such rate have been satisfied or whether such
rate is a Benchmark Replacement or an Unadjusted Benchmark Replacement), (C) determination or calculation of a Benchmark Replacement, or (D) determination of whether a Benchmark Transition Event or Benchmark Replacement Date has occurred, and
in each such case under clauses (A) through (D) above shall be entitled to conclusively rely upon the selection, determination, and/or calculation thereof as provided by the Company or its Calculation Agent, as applicable, and
(ii) liability for any failure or delay in performing its duties hereunder as a result of the unavailability of a Benchmark rate as described in the definition thereof, including, without limitation, as a result of the Company’s or the
Calculation Agent’s failure to select a Benchmark Replacement or the Calculation Agent’s failure to calculate a Benchmark. The Trustee shall be entitled to rely conclusively on all notices from the Company or the Calculation Agent
regarding any Benchmark or Benchmark Replacement, including, without limitation, in regards to Three-Month Term SOFR Conventions, a Benchmark Transition Event, Benchmark Replacement Date, and Benchmark Replacement Conforming Changes. The Trustee
shall not be responsible or liable for the actions or omissions of the Calculation Agent, or any failure or delay in the performance of the Calculation Agent’s duties or obligations, nor shall it be under any obligation to monitor or oversee
the performance of the Calculation Agent. The Trustee shall be entitled to rely conclusively on any determination made, and any instruction, notice, Officers’ Certificate or other instruction or information provided by the Calculation Agent
without independent verification, investigation or inquiry of any kind. 

  

	 	(6)	 If the then-current Benchmark is Three-Month Term SOFR, the Calculation Agent will have the right to establish
the Three-Month Term SOFR Conventions, and if any of the foregoing provisions concerning the calculation of the interest rate and interest payments during the Floating Rate Period are inconsistent with any of the Three-Month Term SOFR Conventions
determined by the Calculation Agent, then the relevant Three-Month Term SOFR Conventions will apply. Furthermore, if the Calculation Agent determines that a Benchmark Transition Event and its related Benchmark Replacement Date have occurred with
respect to the Three-Month Term SOFR at any time when any of the Notes are outstanding, then the foregoing provisions concerning the calculation of the interest rate and interest payments during the Floating Rate Period will be modified in
accordance with this Section 2.05(f). 

  
 16 

 Section 2.06. Subordination. 

 

	 	(a)	 The Company, for itself, its successors and assigns, covenants and agrees, and each Holder of Notes by the
Holder’s acceptance thereof, likewise covenants and agrees, that the payment of the principal of and interest on each and all of the Notes is and will be expressly subordinated in right of payment to the prior payment in full of all Senior
Indebtedness, subject to clause (j) of this Section 2.06, to the extent and in the manner described in this Section 2.06 and Section 1501 of the Base Indenture.

  

	 	(b)	 In the event of the insolvency, bankruptcy, receivership, liquidation or other marshalling of the assets and
liabilities of the Company (subject to the power of a court of competent jurisdiction to make other equitable provision reflecting the rights conferred upon the Senior Indebtedness and the holders thereof with respect to the Notes and the Holders
thereof by a lawful plan of reorganization under applicable bankruptcy law): 

  

	 	(i)	 the holders of all Senior Indebtedness shall first be entitled to receive payment in full in accordance with
the terms of such Senior Indebtedness of the principal thereof, premium, if any, and the interest due thereon (including interest accruing subsequent to the commencement of any proceeding for the bankruptcy or reorganization of the Company under any
applicable bankruptcy, insolvency or similar law now or hereafter in effect) before the Holders of the Notes are entitled to receive any payment upon the principal of or interest on indebtedness evidenced by the Notes; 

 

	 	(ii)	 any payment or distribution of assets of the Company of any kind or character, whether in cash, property or
securities, to which the Holders of the Notes would be entitled except for the provisions of Section 1501 of the Base Indenture and this Section 2.06, including any such payment or distribution that may be payable or
deliverable by reason of the payment of any other indebtedness of the Company being subordinated to the payment of the Notes, shall be paid by the liquidating trustee or agent or other Person making such payment or distribution, whether a bankruptcy
trustee, a receiver or liquidating trustee or otherwise, directly to the holders of Senior Indebtedness or their representative or representatives or to the trustee or trustees under any indenture under which any instruments evidencing any of such
Senior Indebtedness may have been issued, in accordance with the priorities then existing among holders of Senior Indebtedness for payment of the aggregate amounts remaining unpaid on account of the principal, premium, if any, and interest
(including interest accruing subsequent to the commencement of any proceeding for the bankruptcy or reorganization of the Company under any applicable bankruptcy, insolvency or similar law now or hereafter in effect) on the Senior Indebtedness held
or represented by each, to the extent necessary to make payment in full of all Senior Indebtedness remaining unpaid, after giving effect to any other concurrent payment or distribution to the holders

  
 17 

	 	
of such Senior Indebtedness; it being understood that if the Holders of the Notes shall fail to file a proper claim in the form required by any proceeding referred to in this subparagraph
(ii) prior to 30 days before the expiration of the time to file such claim or claims, then the holders of Senior Indebtedness are hereby authorized to file an appropriate claim or claims for and on behalf of the Holders of the Notes, in the
form required in any such proceeding; and 

  

	 	(iii)	 in the event that, notwithstanding the foregoing, any payment or distribution of assets of the Company of any
kind or character, whether in cash, property or securities, including any such payment or distribution that may be payable or deliverable by reason of the payment of any other indebtedness of the Company being subordinate to the payment of the Notes
shall be received by the Trustee or Holders of the Notes before all Senior Indebtedness is paid in full, such payment or distribution shall be paid over to the trustee in bankruptcy, receiver, liquidating trustee, custodian, assignee, agent or other
Person making payment of assets of the Company for all Senior Indebtedness remaining unpaid until all such Senior Indebtedness shall have been paid in full, after giving effect to any concurrent payment or distribution to the holders of such Senior
Indebtedness. 

 Subject to the payment in full of all Senior Indebtedness, the Holders of the Notes shall be subrogated to
the rights of the holders of Senior Indebtedness to receive payments or distributions of cash, property or securities of the Company applicable to the Senior Indebtedness until the principal of and interest on the Notes shall be paid in full and no
such payments or distributions to holders of such Senior Indebtedness to which the Holders of the Notes would be entitled except for the provisions of Section 1501 of the Base Indenture and this Section 2.06, of cash,
property or securities otherwise distributable to the holders of Senior Indebtedness shall, as between the Company, its creditors, other than the holders of Senior Indebtedness, and the Holders of the Notes, be deemed to be a payment by the Company
to or on account of the Senior Indebtedness. It is understood that the provisions of this Section 2.06 are intended solely for the purpose of defining the relative rights of the Holders of the Notes, on the one hand, and
the holders of Senior Indebtedness, on the other hand, and, in the case of clause (j) of this Section 2.06, the holders of Existing Company Subordinated Indebtedness. Upon any payment or distribution of assets
of the Company referred to in this Section 2.06, the Trustee and the Holders of the Notes shall be entitled to rely upon any order or decree of a court of competent jurisdiction in which such proceeding for the insolvency,
bankruptcy, receivership, liquidation or other marshalling of the assets and liabilities of the Company is pending or upon a certificate of the liquidating trustee or agent or other Person making any distribution to the Trustee or to the Holders of
the Notes for the purpose of ascertaining the Persons entitled to participate in such distribution, the holders of the Senior Indebtedness and other indebtedness of the Company, the amount hereof or payable thereon, the amount or amounts paid or
distributed thereon and 

  
 18 

 
all other facts pertinent thereto or to this Section 2.06. In the absence of any such liquidating trustee, agent or other Person, the Trustee shall be entitled to rely
upon a written notice by a Person representing itself to be a holder of Senior Indebtedness (or a trustee or representative on behalf of such holder) as evidence that such Person is a holder of Senior Indebtedness (or is such a trustee or
representative). With respect to the holders of Senior Indebtedness, the Trustee undertakes to perform or to observe only such of its covenants and obligations as are specifically set forth in this Section 2.06, and no
implied covenants or obligations with respect to the holders of Senior Indebtedness shall be read into this Section 2.06 against the Trustee. The Trustee, however, shall not be deemed to owe any fiduciary duty to the
holders of Senior Indebtedness by reason of the execution of the Base Indenture, this Third Supplemental Indenture, or any other supplemental indenture entered into pursuant to Section 301 or Article Nine of the Base Indenture, and shall not be
liable to any such holders if it shall mistakenly pay over or distribute to or on behalf of Holders of the Notes or the Company moneys or assets to which any holders of Senior Indebtedness shall be entitled by virtue of this
Section 2.06. 
  

	 	(c)	 In the event and during the continuation of any default in the payment of principal of, or premium, if any, or
interest on, any Senior Indebtedness, beyond any applicable grace period, or if any event of default with respect to any Senior Indebtedness shall have occurred and be continuing, or would occur as a result of the payment referred to hereinafter,
permitting the holders of such Senior Indebtedness (or a trustee on behalf of the holders thereof) to accelerate the maturity thereof, then, unless and until such default or event of default shall have been cured or waived or shall have ceased to
exist, no payment or principal of or interest on the Notes, shall be made by the Company. 

  

	 	(d)	 Nothing contained in the Base Indenture, this Third Supplemental Indenture, any other supplemental indenture
entered into pursuant to Section 301 or Article Nine of the Base Indenture, or in any of the Notes shall: (i) impair, as between the Company, its creditors, other than the holders of Senior Indebtedness, and Holders of the Notes, the
obligations of the Company, which are unconditional and absolute, to make, or prevent the Company from making, at any time except as provided in clauses (b), (c), or (j) of this Section 2.06,
payments of principal of, or interest (including interest accruing subsequent to the commencement of any proceeding for the bankruptcy or reorganization of the Company under any applicable bankruptcy, insolvency, or similar law now or hereafter in
effect) on, the Notes, as and when the same shall become due and payable in accordance with the terms of the Notes; (ii) affect the relative rights of the Holders of the Notes and creditors of the Company other than the holders of the Senior
Indebtedness; (iii) except as otherwise expressly provided in the Base Indenture, this Third Supplemental Indenture and the Notes with respect to the limitation on the rights of the Trustee and the Holders of Notes, to accelerate the maturity
of the Notes and pursue remedies upon such an acceleration, prevent the Holder of any Notes or the Trustee from exercising all remedies otherwise permitted by applicable law upon default thereunder, subject to the rights, if any, under this

  
 19 

	 	
Section 2.06 of the holders of Senior Indebtedness in respect of cash, property or securities of the Company received upon the exercise of such remedy; or
(iv) prevent the application by the Trustee or any Paying Agent of any moneys deposited with it hereunder to the payment of or on account of the principal of, or interest on, the Notes or prevent the receipt by the Trustee or any Paying Agent
of such moneys, if, prior to the third Business Day prior to such deposit, the Trustee or such Paying Agent did not have written notice of any event prohibiting the making of such deposit by the Company. 

 

	 	(e)	 Each Holder by his acceptance of any Notes authorizes and expressly directs the Trustee on such Holder’s
behalf to take such action as may be necessary or appropriate to effectuate the subordination provided in the Indenture, and appoints the Trustee such Holder’s
attorney-in-fact for such purposes, including, in the event of any termination, winding up, liquidation or reorganization of the Company (whether in bankruptcy,
insolvency, receivership, reorganization or similar proceedings or upon an assignment for the benefit of creditors by the Company, a marshalling of the assets and liabilities of the Company) tending toward the liquidation of the property and assets
of the Company, the filing of a claim for the unpaid balance of the Notes in the form required in those proceedings. 

 The
Company shall give prompt written notice to the Trustee of any fact known to the Company that would prohibit the Company from making any payment to or by the Trustee in respect of the Notes pursuant to the provisions of this
Section 2.06 or Article Fifteen of the Base Indenture. The Trustee shall not be charged with the knowledge of the existence of any default or event of default with respect to any Senior Indebtedness or of any other facts
that would prohibit the making of any payment to or by the Trustee unless and until the Trustee shall have received notice in writing at its Corporate Trust Office to that effect signed by an Officer of the Company, or by a holder of Senior
Indebtedness or a trustee or agent thereof; and prior to the receipt of any such written notice, the Trustee shall, subject to Article Six of the Indenture, be entitled to assume that no such facts exist; provided that, if the Trustee shall not have
received the notice provided for in this Section 2.06 at least two Business Days prior to the date upon which, by the terms of the Indenture, any monies shall become payable for any purpose (including, without limitation,
the payment of the principal of or interest on any Note), then, notwithstanding anything herein to the contrary, the Trustee shall have full power and authority to receive any monies from the Company and to apply the same to the purpose for which
they were received, and shall not be affected by any notice to the contrary that may be received by it on or after such prior date except for an acceleration of the Notes prior to such application. The foregoing shall not apply if the Paying Agent
is the Company. The Trustee shall be entitled to rely on the delivery to it of a written notice by a Person representing himself or itself to be a holder of any Senior Indebtedness (or a trustee on behalf of, or agent of, such holder) to establish
that such notice has been given by a holder of such Senior Indebtedness or a trustee or agent on behalf of any such holder. In the event that the Trustee determines in good faith that any evidence is

  
 20 

 
required with respect to the right of any Person as a holder of Senior Indebtedness to participate in any payment or distribution pursuant to this Section 2.06 or
Article Fifteen of the Base Indenture, the Trustee may request such Person to furnish evidence to the reasonable satisfaction of the Trustee as to the amount of Senior Indebtedness held by such Person, the extent to which such Person is entitled to
participate in such payment or distribution and any other facts pertinent to the rights of such Person under this Section 2.06 or Article Fifteen of the Base Indenture and, if such evidence is not furnished to the Trustee,
the Trustee may defer any payment to such Person pending such evidence being furnished to the Trustee or a judicial determination that such Person has the right to receive such payment. 

 

	 	(f)	 Notwithstanding the provisions of this Section 2.06 or any other provisions of the Indenture, neither the
Trustee nor any Paying Agent shall be charged with knowledge of the existence of any Senior Indebtedness or of any event that would prohibit the making of any payment or moneys to or by the Trustee or such Paying Agent, unless and until a
Responsible Officer of the Trustee or such Paying Agent shall have received written notice thereof from the Company or from the holder of any Senior Indebtedness or from the representative of any such holder. 

 

	 	(g)	 The Trustee shall be entitled to all of the rights set forth in this Section 2.06 in respect of any Senior
Indebtedness at any time held by it in its individual capacity to the extent set forth in Section 605 of the Base Indenture. 

  

	 	(h)	 The failure to make a payment pursuant to the Notes by reason of any provision in this
Section 2.06 shall not be construed as preventing the occurrence of a default or any Event of Default. 

  

	 	(i)	 Nothing contained in this Section 2.06 shall apply to the claims of, or payments to,
the Trustee under or pursuant to Section 607 of the Base Indenture. 

  

	 	(j)	 Subject to the provisions of this clause (j) of Section 2.06 and to any
provisions established or determined with respect to Securities of any Series pursuant to Section 301 of the Base Indenture, the Notes shall rank pari passu in right of payment with the Existing Company Subordinated Indebtedness. Upon the
occurrence of any of the events specified in clause (b) of this Section 2.06, the provisions of that clause and the corresponding provisions of each indenture or other instrument or document establishing or
governing the terms of any Existing Company Subordinated Indebtedness shall be given effect on a pro rata basis to determine the amount of cash, property or securities that may be payable or deliverable as between the holders of Senior Indebtedness,
on the one hand, and the Holders of the Notes and holders of Existing Company Subordinated Indebtedness, on the other hand. 

  
 21 

	 	(k)	 The subordination provisions in this Section 2.06 or Article Fifteen of the Base
Indenture do not apply to amounts due to the Trustee pursuant to other sections of the Indenture, including Section 607 of the Base Indenture. 

Section 2.07. Events of Default; Acceleration. All of the Events of Default set forth in clauses (1), (2), (4), (5) and (6) of
Section 501 of the Base Indenture will apply with respect to the Notes. Notwithstanding the foregoing, because the Company will treat the Notes as Tier 2 capital (or its then equivalent if the Company were subject to such capital requirement)
for purposes of capital adequacy guidelines of the Federal Reserve Board as then in effect and applicable to the Company, upon the occurrence of an Event of Default other than an Event of Default set forth in clause (5) or (6) of
Section 501 of the Base Indenture, neither the Trustee nor the Holders of the Notes may accelerate the maturity of the Notes and make the principal of, and any accrued and unpaid interest on, the Notes, immediately due and payable. 

Section 2.08. No Sinking Fund. The Notes are not entitled to the benefit of any sinking fund. 

Section 2.09. No Conversion or Exchange Rights. The Notes shall not be convertible into or exchangeable for any equity securities, other
securities or other assets of the Company or any Subsidiary. 
 Section 2.10. No Defeasance or Covenant Defeasance. Sections 1202 and 1203 of
the Base Indenture shall not be applicable to the Notes. 
 ARTICLE 3 

REDEMPTION OF THE NOTES 

Section 3.01. Optional Redemption. The Notes shall not be redeemable prior to September 15, 2025, except as provided in
Section 3.02. The Company may redeem the Notes, at its sole option, beginning with the Interest Payment Date of September 15, 2025 and on any Interest Payment Date thereafter, in whole or in part, at a redemption price
equal to 100% of the principal amount of the Notes to be redeemed, plus accrued and unpaid interest to, but excluding, the Redemption Date, and any such redemption may be subject to the satisfaction of one or more conditions precedent set forth in
the applicable notice of redemption (an “Optional Redemption”). No such Optional Redemption of the Notes by the Company prior to the Maturity Date shall be made without the prior approval of the Federal Reserve Board, to the extent
that such approval is then required under the rules of the Federal Reserve Board. The Notes are not subject to repayment at the option of the Holders. 

Section 3.02. Redemption of Special Events. Other than in the case of an Optional Redemption, the Notes may not be redeemed by the Company prior
to the Maturity Date, except the Company may, at its sole option, redeem the Notes at any time before the Maturity Date in whole, but not in part, upon or after the occurrence of a Tax Event, a Tier 2 Capital Event or if the Company is required to
register as an investment company pursuant to the Investment Company Act of 1940 (15 U.S.C. 80a-1 et seq.), as amended. Any such redemption of the Notes will be at a redemption price equal to 100% of the
principal amount of the Notes to be redeemed, plus accrued and unpaid interest to, but excluding, the Redemption Date, and any such redemption may be subject to the satisfaction of one or more conditions precedent set forth in the applicable notice
of 

  
 22 

 
redemption. Notwithstanding the foregoing, installments of interest on any Notes that are due and payable on Interest Payment Dates falling on or prior to the applicable Redemption Date will be
payable on such Interest Payment Dates to the Holders at the close of business on the relevant record dates specified in Sections 2.05(a) and (b) above in accordance with the Notes and this Indenture. No such redemption of the Notes by the
Company prior to the Maturity Date shall be made without the prior approval of the Federal Reserve Board, to the extent that such approval is then required under the rules of the Federal Reserve Board. 

Section 3.03. Notice to Trustee. If the Company elects to redeem the Notes pursuant to the redemption provisions of
Section 3.01 or Section 3.02 of this Third Supplemental Indenture, at least 15 days prior to the Redemption Date (unless a shorter notice shall be agreed to in writing by the Trustee) but not more
than 60 days before the Redemption Date, the Company shall furnish to the Trustee a Company Officers’ Certificate setting forth (i) the applicable section of this Indenture pursuant to which the redemption shall occur, (ii) the
Redemption Date, (iii) the principal amount of Notes to be redeemed, (iv) the redemption price and (v) a Company Board Resolution. 

Section 3.04. Partial Redemption. In the case of a redemption pursuant to Section 3.01, if less than all of the Notes
are to be redeemed, the Trustee shall select the Notes to be redeemed in accordance with the rules of DTC (or, in the case of any certificated Notes, by lot or in such other manner the Trustee deems fair and appropriate). The Trustee shall promptly
notify in writing the Company of the Notes selected for redemption and, in the case of any Notes selected for partial redemption, the principal amount thereof to be redeemed. Notes and portions of Notes selected shall be in minimum amounts of $1,000
or integral multiples of $1,000 in excess thereof; no Notes of a principal amount of $1,000 or less shall be redeemed in part, except that if all of the Notes of a Holder are to be redeemed, the entire outstanding amount of Notes held by such
Holder, even if not equal to $1,000 or an integral multiple of $1,000 in excess thereof, shall be redeemed. Except as provided in the preceding sentence, provisions of this Indenture that apply to Notes called for redemption also apply to portions
of Notes called for redemption. 
 Section 3.05. Notice to Holders. In the case of any redemption, at least 15 days but no more than 60 days
before the Redemption Date, the Company shall send in accordance with the applicable procedures of the Depositary, or if the Notes are not then global Securities the Company shall mail, or cause to be mailed, a notice of redemption by first-class
mail to each Holder of Notes to be redeemed at such Holder’s registered address appearing on the register. The notice shall identify the Notes to be redeemed (including the CUSIP and/or ISIN numbers thereof, if any) and shall state: 

 

	 	(a)	 the Redemption Date; 

 

	 	(b)	 the principal amount of the Notes that are being redeemed; 

 

	 	(c)	 each Place of Payment; 

 

	 	(d)	 the redemption price and accrued interest to the Redemption Date that is payable pursuant to Section 1102
of the Base Indenture; 

  
 23 

	 	(e)	 if fewer than all outstanding Notes are to be redeemed, the portion of the principal amount of such Notes to be
redeemed and that, after the Redemption Date and upon surrender of such Notes, if applicable, a new Note or Notes in principal amount equal to the unredeemed portion will be issued; 

 

	 	(f)	 the name and address of the Paying Agent; 

 

	 	(g)	 that Notes called for redemption must be surrendered to the Paying Agent to collect the redemption price;

  

	 	(h)	 that unless the Company defaults in making the redemption payment, interest on Notes called for redemption
ceases to accrue on and after the Redemption Date; 

  

	 	(i)	 if such notice is conditioned upon the satisfaction of one or more conditions precedent, such conditions
precedent; 

  

	 	(j)	 the applicable section of this Indenture pursuant to which the Notes called for redemption are being redeemed;
and 

  

	 	(k)	 that no representation is made as to the correctness or accuracy of the CUSIP and/or ISIN numbers, if any,
listed in such notice or printed on the Notes. 

 The Company may state in the notice of redemption that payment of the redemption price
and performance of its obligations with respect to redemption or purchase may be performed by another Person. 
 At the Company’s request, the Trustee
shall give the notice of redemption in the Company’s name and at its expense; provided, that the Company shall have delivered to the Trustee, at least 15 days prior to the Redemption Date, a Company Officers’ Certificate requesting that
the Trustee give such notice and attaching a copy of such notice, which shall set forth the information to be stated in such notice as provided in this Article 3. If any condition precedent to a redemption has not been satisfied, the Company
will provide written notice to the Trustee not less than two Business Days prior to the Redemption Date that such condition precedent has not been satisfied, that the notice of redemption is rescinded or delayed and that the redemption subject to
the satisfaction of such condition precedent shall not occur or shall be delayed (or that such condition precedent is waived and such redemption shall occur or shall be delayed). The Trustee shall promptly send a copy of such notice to the Holders
of the Notes. 
 ARTICLE 4 

FORM OF NOTES 
 Section 4.01. Form
of Notes. The Notes and the Trustee’s certificate of authentication thereon are to be substantially in the form attached as Exhibit A hereto, with such changes therein as the officers of the Company executing the Notes (by manual or
facsimile signature) may approve, such approval to be conclusively evidenced by their execution thereof. To the extent the terms and conditions of the Notes are not set forth herein, such terms and conditions of the Notes shall be as set forth in
the form attached as Exhibit A hereto. 

  
 24 

 ARTICLE 5 

SUPPLEMENTAL INDENTURES 

Section 5.01. Supplemental Indentures without Consent of Holders. Solely with respect to the Notes, and not for the purposes of any other
Securities, Section 901 of the Base Indenture shall be amended to (i) delete the word “or” at the end of clause (13) thereof, (ii) replace the period at the end of clause (14) thereof with “; and” and
(iii) add a new clause (15) immediately after clause (14), which shall read as follows: 
 (15) to implement in accordance with the
terms of this Indenture and any supplemental indenture any Three-Month Term SOFR Conventions or any Benchmark Transition provisions after a Benchmark Transition Event and its related Benchmark Replacement Date have occurred (or in anticipation
thereof). 
 ARTICLE 6 

IMMUNITY OF STOCKHOLDERS, EMPLOYEES, AGENTS, OFFICERS AND 

DIRECTORS 
 Section 6.01. Indenture
and Notes Solely Corporate Obligations. No recourse for the payment of the principal of or interest on any Note, for any claim based thereon, or otherwise in respect thereof, shall be had against any incorporator, shareholder, officer, director,
employee or agent, as such, past, present or future, of the Company or of any successor Person to the Company, it being expressly understood that all such liability is hereby expressly waived and released as a condition of, and as a consideration
for, the execution of this Third Supplemental Indenture and the issue of the Notes. 
 ARTICLE 7 

MISCELLANEOUS 
 Section 7.01.
Ratification of Base Indenture. Solely with respect to the Notes, the Base Indenture, as supplemented by this Third Supplemental Indenture, is in all respects ratified and confirmed, and this Third Supplemental Indenture shall be deemed part
of the Base Indenture in the manner and to the extent herein and therein provided. 
 Section 7.02. Trustee Not Responsible for Recitals. The
recitals contained herein and in the Notes, except the Trustee’s certificates of authentication, shall be taken as statements of the Company and not those of the Trustee, and the Trustee assumes no responsibility for the correctness thereof.
The Trustee makes no representations as to the validity or sufficiency of this Third Supplemental Indenture or of the Notes. The Trustee shall not be accountable for the use or application by the Company of the Notes or of the proceeds thereof. 

Section 7.03. Texas Law To Govern. THIS THIRD SUPPLEMENTAL INDENTURE AND EACH NOTE SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS
OF THE STATE OF TEXAS APPLICABLE TO AGREEMENTS MADE OR INSTRUMENTS ENTERED INTO AND, IN EACH CASE, PERFORMED IN SAID STATE. 
 Section 7.04.
Severability. In case any provision in this Third Supplemental Indenture or in the Notes shall be invalid, illegal or unenforceable, the validity, legality and enforceability of the remaining provisions shall not in any way be affected or
impaired by such invalid, illegal or unenforceable provision. 

  
 25 

 Section 7.05. Counterparts. This Third Supplemental Indenture may be executed in any number of
counterparts each of which shall be an original, but such counterparts shall together constitute but one and the same instrument. The exchange of copies of this Third Supplemental Indenture and of signature pages by facsimile or electronic format
(i.e., “.pdf” or “.tif”) transmission shall constitute effective execution and delivery of this Third Supplemental Indenture as to the parties hereto and may be used in lieu of the original Third Supplemental Indenture for all
purposes. Signatures of the parties hereto transmitted by facsimile or electronic format (i.e., “.pdf” or “.tif”) shall be deemed to be their original signatures for all purposes. 

Section 7.06. Benefits of Third Supplemental Indenture. Nothing in this Third Supplemental Indenture or in the Notes, express or implied, shall
give to any Person, other than the parties to this Third Supplemental Indenture and their successors under this Third Supplemental Indenture and the Holders from time to time, any benefit or any legal or equitable right, remedy or claim under this
Third Supplemental Indenture. 
 Section 7.07. Conflict with Base Indenture. If any provision of this Third Supplemental Indenture relating to
the Notes is inconsistent with any provision of the Base Indenture, such provision of this Third Supplemental Indenture shall control. 
 Section 7.08.
Provisions of Trust Indenture Act Controlling. This Third Supplemental Indenture is subject to the provisions of the Trust Indenture Act that are required to be part of the Indenture and shall, to the extent applicable, be governed by such
provisions. If any provision of this Third Supplemental Indenture limits, qualifies, or conflicts with a provision of the Trust Indenture Act that is required under the Trust Indenture Act to be a part of and govern this Third Supplemental
Indenture, the provision of the Trust Indenture Act shall control. 
 Section 7.09. Successors. All agreements of the Company in the Base
Indenture, this Third Supplemental Indenture and the Notes shall bind its successors. All agreements of the Trustee in the Base Indenture and this Third Supplemental Indenture shall bind its successors. 

[REMAINDER OF PAGE LEFT INTENTIONALLY BLANK.] 

  
 26 

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

			
	 INDEPENDENT BANK GROUP,

INC.

		
	By:	 	 /s/ David R. Brooks

		 	David R. Brooks
		 	Chairman of the Board, Chief Executive Officer and President
	
	 WELLS FARGO BANK,

NATIONAL ASSOCIATION, as
 Trustee

		
	By:	 	 /s/ Patrick Giordano

		 	Patrick Giordano
		 	Vice President

 Signature Page to Third Supplemental Indenture 

  
 27 

 EXHIBIT A 

[Note: The following legend is to be placed at the beginning of any Global Note 

representing Notes.] 

GLOBAL NOTE 
 THIS SECURITY IS A GLOBAL
SECURITY WITHIN THE MEANING OF THE INDENTURE REFERRED TO IN THIS SECURITY AND IS REGISTERED IN THE NAME OF A DEPOSITARY OR ITS NOMINEE. THIS SECURITY MAY NOT BE TRANSFERRED TO, OR REGISTERED OR EXCHANGED FOR SECURITIES REGISTERED IN THE NAME OF, ANY
PERSON OTHER THAN THE DEPOSITARY OR ITS NOMINEE OR A SUCCESSOR OF SUCH DEPOSITARY OR A NOMINEE OF SUCH SUCCESSOR AND NO SUCH TRANSFER MAY BE REGISTERED, EXCEPT IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE. EVERY SECURITY AUTHENTICATED AND
DELIVERED UPON REGISTRATION OF TRANSFER OF, OR IN EXCHANGE FOR OR IN LIEU OF, THIS SECURITY SHALL BE A GLOBAL SECURITY SUBJECT TO THE FOREGOING, EXCEPT IN SUCH LIMITED CIRCUMSTANCES. 

UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITARY TRUST COMPANY, A NEW YORK CORPORATION (“DTC”), TO THE
COMPANY (AS DEFINED HEREIN) OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE, OR PAYMENT, AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC
(AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE, OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE
REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN. 
 THIS SECURITY AND THE OBLIGATIONS OF THE COMPANY (AS DEFINED HEREIN) EVIDENCED
HEREBY (1) ARE NOT DEPOSITS WITH OR HELD BY THE COMPANY AND ARE NOT INSURED BY ANY FEDERAL AGENCY, INCLUDING, WITHOUT LIMITATION, THE FEDERAL DEPOSIT INSURANCE CORPORATION AND (2) ARE SUBORDINATE IN RIGHT OF PAYMENT TO THE SENIOR
INDEBTEDNESS (AS DEFINED IN THE INDENTURE IDENTIFIED HEREIN). 
 INDEPENDENT BANK GROUP, INC. 

4.00% FIXED-TO-FLOATING RATE SUBORDINATED NOTES DUE 2030

  

			
	No. _	  	CUSIP: 45384B AC0
	$	  	ISIN: US45384BAC00

 Independent Bank Group, Inc., a Texas corporation (the “Company,” which term includes any successor
corporation under the Indenture hereinafter referred to), for value received, hereby promises to pay to Cede & Co., or registered assigns, the principal sum of $130,000,000 

  
 1 

 
DOLLARS (or such other amount as set forth in the Schedule of Increases or Decreases in the Note attached hereto) on September 15, 2030 (such date, the “Maturity Date”),
unless redeemed prior to such Maturity Date, and to pay interest thereon as set forth below: 
 From and including September 15, 2020, to, but
excluding, September 15, 2025 (unless redeemed prior to such date pursuant to Section 3.02 of the Third Supplemental Indenture (as defined herein)) (the “Fixed Rate Period”), this note (this
“Note”) will bear interest at a rate of 4.00% per year. During the Fixed Rate Period, interest on the Note will accrue from and including September 15, 2020, and will be payable semiannually in arrears on March 15 and
September 15 of each year during the Fixed Rate Period, commencing on March 15, 2021 (each such date, a “Fixed Period Interest Payment Date”). The interest payable on the Note on any Fixed Period Interest Payment Date
will, except as noted below, be paid to the Holder at the close of business on March 1 or September 1 (whether or not a Business Day) immediately preceding the Fixed Period Interest Payment Date. 

From and including September 15, 2025, to, but excluding, the Maturity Date (unless redeemed prior to such date pursuant to
Section 3.01 or Section 3.02 of the Third Supplemental Indenture) (the “Floating Rate Period”), this Note will bear interest at a floating rate per year equal to the Benchmark,
plus 388.50 basis points. During the Floating Rate Period, interest on the Note will accrue from and including September 15, 2025 and will be payable quarterly in arrears on March 15, June 15, September 15 and December 15 of
each year, commencing on December 15, 2025 (each such date, a “Floating Period Interest Payment Date” and, together with a Fixed Period Interest Payment Date, an “Interest Payment Date”). The interest payable
on the Note on any Floating Period Interest Payment Date will, except as noted below, be paid to Holder at the close of business on March 1, June 1, September 1 or December 1 (whether or not a Business Day) immediately preceding
the Floating Period Interest Payment Date. However, interest that the Company pays on the Maturity Date will be paid to the Person to whom the principal will be payable. Notwithstanding the foregoing, if the Benchmark is less than zero, then the
Benchmark shall be deemed to be zero. 
 Principal and interest on the Note will be payable by wire transfer in immediately available funds in Dollars at an
office or agency of the Company maintained for such purpose, which shall initially be the Corporate Trust Office of the Paying Agent in Los Angeles, California. 

Reference is hereby made to the further provisions of this Note set forth on the reverse hereof, which further provisions shall for all purposes have the same
effect as if set forth at this place. 
 Unless the certificate of authentication hereon has been executed by the Trustee referred to on the reverse hereof
by manual or facsimile signature, this Note shall not be entitled to any benefit under the Indenture or be valid or obligatory for any purpose. 

(Signature page follows) 

  
 2 

 IN WITNESS WHEREOF, the Company has caused this instrument to be duly executed. 

Dated: 
  

			
	INDEPENDENT BANK GROUP, INC.
		
	By:	 	      

		 	David R. Brooks
		 	Chairman of the Board, Chief Executive Officer and President
		
	By:	 	      

		 	Nicole Metcalf
		 	Corporate Secretary

 [Signature Page to Global Note] 

  
 3 

 TRUSTEE’S CERTIFICATE OF AUTHENTICATION 

This is one of the Securities of the Series designated therein referred to in the within-mentioned Indenture. 

Dated: 
  

			
	WELLS FARGO BANK, NATIONAL ASSOCIATION, as Trustee
		
	By:	 	      

	Name:	 	Patrick Giordano
	Title:	 	Vice President

 [Signature Page to Global Note] 

  
 4 

 REVERSE OF NOTE 

INDEPENDENT BANK GROUP, INC. 

4.00% FIXED-TO-FLOATING RATE SUBORDINATED NOTES DUE 2030

 This Note is one of a duly authorized issue of Securities of the Company of a series designated as the “4.00% Fixed-to-Floating Rate Subordinated Notes Due 2030” (the “Notes”) initially issued in an aggregate principal amount of $130,000,000 on September 15, 2020. Such series of Securities
has been established pursuant to, and is one of an unsecured indefinite number of series of subordinated debt securities of the Company issued or issuable under and pursuant to, the Subordinated Debt Indenture (the “Base
Indenture”), dated as of June 25, 2014, between the Company and Wells Fargo Bank, National Association, as Trustee (herein called the “Trustee,” which term includes any successor trustee), as supplemented and amended
by the Third Supplemental Indenture, between the Company and the Trustee, dated as of September 15, 2020 (the “Third Supplemental Indenture” and the Base Indenture as supplemented and amended by the Third Supplemental
Indenture, the “Indenture”), to which Indenture and any other indentures supplemental thereto reference is hereby made for a statement of the respective rights, limitations of rights, duties and immunities thereunder of the Company,
the Trustee and the Persons in whose names Notes are registered on the Security Register from time to time and of the terms upon which the Notes are, and are to be, authenticated and delivered. This Note shall not be valid until the Trustee manually
signs the certificate of authentication on this Note. The terms, conditions and provisions of the Notes are those stated in the Indenture, those made part of the Indenture by reference to the Trust Indenture Act of 1939, as amended, and those set
forth in this Note. To the extent that the terms, conditions and provisions of this Note modify, supplement or are inconsistent with those of the Indenture, then the terms, conditions and other provisions of the Indenture shall govern to the extent
such terms, conditions and other provisions of this Note are not inconsistent with the terms, conditions and provisions made part of the Indenture by reference to the Trust Indenture Act of 1939, as amended. 

All capitalized terms used in this Note and not defined herein that are defined in the Base Indenture or the Third Supplemental Indenture shall have the
meanings assigned to them in the Base Indenture or the Third Supplemental Indenture. If any capitalized term used in this Note and defined herein is also defined in the Base Indenture or the Third Supplemental Indenture, in the event of any conflict
in the meanings ascribed to such capitalized term, the definition of the capitalized term in this Note shall control. To the extent any provision of this Note conflicts with the express provisions of the Indenture, the provisions of the Indenture
shall govern and be controlling. 
 The indebtedness of the Company evidenced by the Notes, including the principal thereof and interest thereon, is, to the
extent and in the manner set forth in the Third Supplemental Indenture, subordinate and junior in right of payment to obligations of the Company constituting the Senior Indebtedness (as defined in the Indenture) on the terms and subject to the terms
and conditions as provided and set forth in Section 2.06 of the Third Supplemental Indenture and shall rank pari passu in right of payment with all other Notes and with all other unsecured subordinated indebtedness of the Company issued under
the Indenture and not by its terms subordinate and junior in right of payment to the promissory notes, bonds, debentures or other evidences of indebtedness of a type that includes the Notes. Each Holder by his acceptance of this Note, agrees to and
shall be bound by such provisions of the Indenture and authorizes and expressly directs the Trustee on such Holder’s behalf to take such actions as may be necessary or appropriate to effectuate the subordination provided in the Indenture. 

  
 5 

 During the Fixed Rate Period, interest will be computed on the basis of a
360-day year consisting of twelve 30-day months. During the Floating Rate Period, interest will be computed on the basis of a
360-day year and the actual number of days elapsed. Dollar amounts resulting from those calculations will be rounded to the nearest cent, with one-half cent being
rounded upward. 
 If any Fixed Period Interest Payment Date for the Note or the date for the payment of principal for the Note occurring during the Fixed
Rate Period falls on a day that is not a Business Day, the Company will postpone the interest or principal payment to the next succeeding Business Day, but the payments made on such dates will be treated as being made on the date that the payment
was first due and the Holder of the Note will not be entitled to any further interest, principal or other payments with respect to such postponements. If any Floating Period Interest Payment Date or the Maturity Date falls on a day that is not a
Business Day, the Company will postpone the interest payment or the payment of principal and interest at the Maturity Date to the next succeeding Business Day (and, with respect to the Maturity Date, no additional interest will accrue on the amount
payable for the period from and after the Maturity Date), unless, with respect to a Floating Period Interest Payment Date only, such day falls in the next calendar month, in which case the Floating Period Interest Payment Date will instead be the
immediately preceding day that is a Business Day, and interest will accrue to, but excluding, such Floating Period Interest Payment Date as so adjusted. 

The Notes are intended to be treated as Tier 2 capital (or its then equivalent if the Company were subject to such capital requirement) for purposes of
capital adequacy guidelines of the Federal Reserve Board as then in effect and applicable to the Company. If an Event of Default with respect to Notes shall occur and be continuing, the principal and any accrued and unpaid interest on the Notes
shall only become due and payable in accordance with the terms and conditions set forth in Article Five of the Base Indenture and Section 2.07 of the Third Supplemental Indenture. Accordingly, the Holder of this Note has no right to
accelerate the maturity of this Note in the event the Company fails to pay interest on any of the Notes or fails to perform any other obligations under the Notes or in the Indenture that are applicable to the Notes. 

The Notes may be redeemed by the Company as set forth in the Indenture. 

The Notes are not entitled to the benefit of any sinking fund. The Notes shall not be convertible into or exchangeable for any equity securities, other
securities or other assets of the Company or any Subsidiary. 
 Sections 1202 and 1203 of the Base Indenture shall not be applicable to the Notes. 

The Notes are issuable and may be transferred only in fully registered form without coupons, in denominations of $1,000 or any amount in excess thereof that
is an integral multiple of $1,000. 
 The Company and the Trustee and any agent of the Company or the Trustee may treat the Person in whose name this Note
is registered as the owner hereof for all purposes, whether or not this Note is overdue, and neither the Company, the Trustee nor any such agent shall be affected by notice to the contrary. 

  
 6 

 No reference herein to the Indenture and no provision of this Security or of the Indenture shall alter or
impair the obligation of the Company, which is absolute and unconditional, to pay the principal of and interest (if any) on this Security at the times, place and rate, and in the coin or currency, herein prescribed. 

[NOTE: THE PROVISIONS BELOW THAT APPEAR IN BRACKETS WILL BE INSERTED INTO ANY GLOBAL NOTE REPRESENTING NOTES.] [This Security is a global note, represented
by one or more permanent global certificates registered in the name of the nominee of The Depositary Trust Company (each a “Global Note” and collectively, the “Global Notes”). Accordingly, unless and until it is
exchanged in whole or in part for individual certificates evidencing the Notes represented hereby, this Security may not be transferred except as a whole by The Depositary Trust Company (the “Depositary”) to a nominee of such
Depositary or by a nominee of such Depositary or by the Depositary or any nominee to a successor Depositary or any nominee of such successor. Ownership of beneficial interests in this Security will be shown on, and the transfer of that ownership
will be effected only through, records maintained by the applicable Depositary or its nominee (with respect to interest of Persons that have accounts with the Depositary (“Participants”) and the records of Participants (with respect
to interests of Persons other than Participants)). Beneficial interests in Notes owned by Persons that hold through Participants will be evidenced only by, and transfers of such beneficial interests with such Participants will be effected only
through, records maintained by such Participants. Except as provided below, owners of beneficial interests in this Security will not be entitled to have any individual certificates and will not be considered the owners or Holders thereof under the
Indenture. 
 Except in the limited circumstances set forth in Section 305 of the Base Indenture, Participants and owners of beneficial
interests in the Global Notes will not be entitled to receive Securities in definitive form and will not be considered Holders of Notes. None of the Company, the Trustee or the Paying Agent will be liable for any delay by the Depositary, its nominee
or any direct or indirect participant in identifying the beneficial owners of the related Notes. The Company and the Paying Agent may conclusively rely on, and will be protected in relying on, instructions from the Depositary or its nominee for all
purposes, including with respect to the registration and delivery, and the respective principal amounts, of the Notes to be issued. 
 Except as
provided in Section 305 of the Base Indenture, beneficial owners of Global Notes will not be entitled to receive physical delivery of Notes in definitive form and no Global Note will be exchangeable except for another Global Note of like
denomination and tenor to be registered in the name of the Depositary or its nominee. Accordingly, each Person owning a beneficial interest in a Global Note must rely on the procedures of the Depositary and, if such Person is not a Participant, on
the procedures of the Participant through which such Person owns its interest, to exercise any rights of a Holder under the Notes. 

  
 7 

 The laws of some jurisdictions may require that purchasers of securities take physical delivery of those
securities in definitive form. Accordingly, the ability to transfer interests in the Notes represented by a Global Note to those Persons may be limited. In addition, because the Depositary can act only on behalf of its Participants, who in turn act
on behalf of Persons who hold interests through Participants, the ability of a Person having an interest in Notes represented by a Global Note to pledge or transfer such interest to Persons that do not participate in the Depositary’s system, or
otherwise to take actions in respect of such interest, may be affected by the lack of a physical definitive security in respect of such interest. None of the Company, the Trustee, the Paying Agent and the Security Registrar will have any
responsibility or liability for any aspect of the records relating to or payments made on account of Notes by the Depositary, or for maintaining, supervising or reviewing any records of the Depositary relating to the Notes.] 

Wells Fargo Bank, National Association will act as the Company’s Paying Agent with respect to the Notes through its offices presently located at 333 S
Grand Ave—Floor 05, Los Angeles, California 90071-1504. The Company may at any time rescind the designation of a Paying Agent, appoint a successor Paying Agent, or approve a change in the office through which any Paying Agent acts. 

Customary abbreviations may be used in the name of a Holder of a Note or an assignee, such as: TEN COM (= tenants in common), TEN ENT (= tenants by the
entireties), JT TEN (= joint tenants with right of survivorship and not as tenants in common), CUST (= Custodian), and U/G/M/A (= Uniform Gifts to Minors Act). 

Pursuant to a recommendation promulgated by the Committee on Uniform Security Identification Procedures, the Company has caused the CUSIP number for the
Series of Securities of which the Notes are a part to be printed on the Notes as a convenience to the Holders of the Notes. No representation is made as to the accuracy of such numbers as printed on the Notes and reliance may be placed only on the
other identification numbers printed hereon. 
 THIS NOTE SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF TEXAS APPLICABLE
TO AGREEMENTS MADE OR INSTRUMENTS ENTERED INTO AND, IN EACH CASE, PERFORMED IN SAID STATE. 

  
 8 

 ASSIGNMENT FORM 

To assign the within Security, fill in the form below: 
 I or we
assign and transfer the within Security to: 
 (Insert assignee’s legal name) 

(Insert assignee’s social security or tax I.D. no.) 

(Print or type assignee’s name, address and zip code) 

and irrevocably appoint as agent to transfer this Security on the books of Independent Bank Group, Inc. The agent may substitute another to act for it. 

 

	
	 Your Signature:

	 (Sign exactly as your name appears on the other side of this Security)

	 Your Name:

	 Date:

	 Signature Guarantee: *

  

	*	 NOTICE: The Signature must be guaranteed by an Institution which is a member of one of the following recognized
signature Guarantee Programs: (i) The Securities Transfer Agent Medallion Program (STAMP); (ii) The New York Stock Exchange Medallion Program (MNSP); (iii) The Stock Exchange Medallion Program (SEMP); or (iv) such other guarantee program
acceptable to the Trustee. 

 SIGNATURE GUARANTEE 

Signatures must be guaranteed by an “eligible guarantor institution” meeting the requirements of the Security registrar, which requirements include
membership or participation in the Security Transfer Agent Medallion Program (“STAMP”) or such other “signature guarantee program” as may be determined by the Security registrar in addition to, or in substitution for,
STAMP, all in accordance with the Securities Exchange Act of 1934, as amended. 

  
 9 

 SCHEDULE OF INCREASES OR DECREASES IN NOTE 

The initial principal amount of this Note is $                . The following
increases or decreases in the principal amount of this Note have been made: 
  

									
	 Date
	  	Amount
of
decrease
in
principal
amount
of this
Note	  	Amount
of
decrease
in
principal
amount
of this
Note	  	Principal
amount
of this
Note
following
such
decrease
or
increase	  	Signature
of
authorized
signatory
of Trustee

  
 10Exhibit 4.1

 

 

Advisors Asset Management, Inc.

18925 Base Camp Road

Monument, Colorado 80132

September 16, 2020

 

Advisors Disciplined Trust 2015

c/o The Bank of New York Mellon, as Trustee

BNY Atlantic Terminal

2 Hanson Place, 12th Floor

Brooklyn, New York 11217

 

Re: Advisors Disciplined Trust 2015 (the “Fund”)

Ladies and Gentlemen:

We have examined
the Registration Statement File No. 333-240308 for the above captioned Fund. We hereby consent to the use in the Registration Statement
of the references to Advisors Asset Management, Inc. as evaluator.

You are hereby authorized
to file a copy of this letter with the Securities and Exchange Commission.

 

	 	Very truly yours,
	 	 	 
	 	Advisors Asset Management, Inc.
	 	 	 
	 	 	 
	 	By	/s/ ALEX R. MEITZNER
	 		Alex R. Meitzner
	 		Senior Vice President

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00314-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00314-of-00352.parquet"}]]