Document:

EX-4.14

 Exhibit 4.14 

ASSUMPTION OF 

SUBORDINATED NOTE DUE JUNE 3, 2018 

This assumption agreement (this “Assumption”) is executed as of [—], 2014
by Great Western Bancorp, Inc., a Delaware corporation (the “Successor Issuer”), and Great Western Bancorporation, Inc., an Iowa corporation (the “Issuer”). 

WHEREAS, National Australia Bank New York Branch, a branch of National Australia Bank Limited (a corporation organized under the laws of the
Commonwealth of Australia), is the registered holder of the $35,795,000 aggregate principal amount Subordinated Note due June 3, 2018 (the “Subordinated Note”) issued by Great Western Bancorporation, Inc., an Iowa corporation;

 WHEREAS, in preparation for the expected initial public offering of common stock, par value $0.01 per share, issued by the Successor
Issuer, the Issuer intends to merge with and into the Successor Issuer pursuant to the Agreement and Plan of Merger, dated as of [—], 2014 (the “Merger Agreement”), between the
Issuer and the Successor Issuer, with the Successor Issuer continuing as the surviving entity (the “Merger”); 
 WHEREAS,
the Merger will become effective in accordance with the terms of the Merger Agreement as set forth in the certificate of merger to be filed in the office of the Secretary of State of Delaware and the articles of merger to be filed in the office of
the Secretary of State of the State of Iowa (the time the Merger becomes effective being the “Effective Time”); and 

WHEREAS, Section 4 of the Subordinated Note requires any entity with or into which the Issuer merges to expressly assume the due and
punctual payment of the principal of and interest on the Subordinated Note. 
 NOW, THEREFORE, in compliance with Section 4 of the
Subordinated Note, and in consideration of the covenants contained herein and intending to be legally bound hereby, the Successor Issuer agrees as follows: 

1. Assumption of Performance. Effective as of the Effective Time, the Issuer hereby expressly assigns, and the Successor Issuer hereby
expressly assumes, (i) the due and punctual payment of the principal of and interest on the Subordinated Note, and (ii) the performance and observance of every provision of the Subordinated Note on the part of the Issuer to be performed or
observed. 
 2. Governing Law. This Assumption shall be governed by and construed in accordance with the laws of the State of New
York without regard to conflicts of laws principles. 
 3. Successors and Assigns. This Assumption shall be binding upon the
respective successors and assigns of the parties hereto. 

 4. Headings. The headings used in this Assumption are included for convenience only and
shall not in any way affect the meaning or construction of any provision of this Assumption. 
 5. Counterparts. This Assumption may
be executed in any number of counterparts, each of which so executed shall be deemed to be an original, but all of which together shall constitute one and the same instrument. 

6. Notices to the Successor Issuer. All notices to the Successor Issuer shall be delivered in writing to P.O. Box 2345,
100 N. Phillips Ave., Sioux Falls, SD 57101; Attention: Corporate Secretary. 
 7. Termination. This Assumption will
terminate and be of no further force and effect if the Merger Agreement is terminated for any reason or the Merger is otherwise not consummated. 

[Signature page follows] 

 IN WITNESS WHEREOF, the parties hereto have caused this Assumption to be duly executed as of the
date first written above. 
  

			
	Great Western Bancorporation, Inc.
	
	  

	Name:	 	Peter Chapman
	Title:	 	Vice President & Chief Financial Officer
	
	Great Western Bancorp, Inc.
	
	  

	Name:	 	Ken Karels
	Title:	 	President & CEO

 [Signature Page – GWB Assumption of Subordinated Note]EX-4.15

 Exhibit 4.15 

 
  

GUARANTEE AGREEMENT 
 by
and between 
 GREAT WESTERN BANCORPORATION, INC. 

and 
 U.S. BANK NATIONAL
ASSOCIATION 
 Dated as of December 17, 2003 

 
  

 GUARANTEE AGREEMENT 

This GUARANTEE AGREEMENT (this “Guarantee”), dated as of December 17, 2003, is executed and delivered by Great Western
Bancorporation, Inc., an Iowa corporation (the “Guarantor”), and U.S. Bank National Association, a national banking association, organized under the laws of the United States of America, as trustee (the “Guarantee Trustee”), for
the benefit of the Holders (as defined herein) from time to time of the Capital Securities (as defined herein) of Great Western Statutory Trust IV, a Connecticut statutory trust (the “Issuer”). 

WHEREAS, pursuant to an Amended and Restated Declaration of Trust (the “Declaration”), dated as of the date hereof among U.S. Bank
National Association, not in its individual capacity but solely as institutional trustee, the administrators of the Issuer named therein, the Guarantor, as sponsor, and the holders from time to time of undivided beneficial interests in the assets of
the Issuer, the Issuer is issuing on the date hereof those undivided beneficial interests, having an aggregate liquidation amount of $22,400,000.00 (the “Capital Securities”); and 

WHEREAS, as incentive for the Holders to purchase the Capital Securities, the Guarantor desires irrevocably and unconditionally to agree, to
the extent set forth in this Guarantee, to pay to the Holders of Capital Securities the Guarantee Payments (as defined herein) and to make certain other payments on the terms and conditions set forth herein; 

NOW, THEREFORE, in consideration of the purchase by each Holder of the Capital Securities, which purchase the Guarantor hereby agrees shall
benefit the Guarantor, the Guarantor executes and delivers this Guarantee for the benefit of the Holders. 
 ARTICLE I 

DEFINITIONS AND INTERPRETATION 

Section 1.1. Definitions and Interpretation. In this Guarantee, unless the context otherwise requires: 

(a) capitalized terms used in this Guarantee but not defined in the preamble above have the respective meanings assigned to them in this
Section 1.1; 
 (b) a term defined anywhere in this Guarantee has the same meaning throughout; 

(c) all references to “the Guarantee” or “this Guarantee” are to this Guarantee as modified, supplemented or amended from
time to time; 
 (d) all references in this Guarantee to “Articles” or “Sections” are to Articles or Sections of this
Guarantee, unless otherwise specified; 
 (e) terms defined in the Declaration as at the date of execution of this Guarantee have the same
meanings when used in this Guarantee, unless otherwise defined in this Guarantee or unless the context otherwise requires; and 
 (f) a
reference to the singular includes the plural and vice versa. 
 “Affiliate” has the same meaning as given to that term in
Rule 405 of the Securities Act of 1933, as amended, or any successor rule thereunder. 

 “Beneficiaries” means any Person to whom the Issuer is or hereafter becomes
indebted or liable. 
 “Capital Securities” has the meaning set forth in the recitals to this Guarantee. 

“Common Securities” means the common securities issued by the Issuer to the Guarantor pursuant to the Declaration. 

“Corporate Trust Office” means the office of the Guarantee Trustee at which the corporate trust business of the Guarantee
Trustee shall, at any particular time, be principally administered, which office at the date of execution of this Guarantee is located at 225 Asylum Street, Goodwin Square, Hartford, Connecticut 06103. 

“Covered Person” means any Holder of Capital Securities. 

“Debentures” means the debt securities of the Guarantor designated the Floating Rate Junior Subordinated Deferrable Interest
Debentures due 2033 held by the Institutional Trustee (as defined in the Declaration) of the Issuer. 
 “Declaration Event of
Default” means an “Event of Default” as defined in the Declaration. 
 “Event of Default” has the
meaning set forth in Section 2.4(a). 
 “Guarantee Payments” means the following payments or distributions, without
duplication, with respect to the Capital Securities, to the extent not paid or made by the Issuer: (i) any accrued and unpaid Distributions (as defined in the Declaration) which are required to be paid on such Capital Securities to the extent
the Issuer shall have funds available therefor, (ii) the Redemption Price to the extent the Issuer has funds available therefor, with respect to any Capital Securities called for redemption by the Issuer, (iii) the Special Redemption Price
to the extent the Issuer has funds available therefor, with respect to Capital Securities redeemed upon the occurrence of a Special Event, and (iv) upon a voluntary or involuntary liquidation, dissolution, winding-up or termination of the
Issuer (other than in connection with the distribution of Debentures to the Holders of the Capital Securities in exchange therefor as provided in the Declaration), the lesser of (a) the aggregate of the liquidation amount and all accrued and
unpaid Distributions on the Capital Securities to the date of payment, to the extent the Issuer shall have funds available therefor, and (b) the amount of assets of the Issuer remaining available for distribution to Holders in liquidation of
the Issuer (in either case, the “Liquidation Distribution”). 
 “Guarantee Trustee” means U.S. Bank National
Association, until a Successor Guarantee Trustee has been appointed and has accepted such appointment pursuant to the terms of this Guarantee and thereafter means each such Successor Guarantee Trustee. 

“Guarantor” means Great Western Bancorporation, Inc. and each of its successors and assigns. 

“Holder” means any holder, as registered on the books and records of the Issuer, of any Capital Securities; provided,
however, that, in determining whether the Holders of the requisite percentage of Capital Securities have given any request, notice, consent or waiver hereunder, “Holder” shall not include the Guarantor or any Affiliate of the
Guarantor. 
 “Indemnified Person” means the Guarantee Trustee, any Affiliate of the Guarantee Trustee, or any officers,
directors, shareholders, members, partners, employees, representatives, nominees, custodians or agents of the Guarantee Trustee. 

  
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 “Indenture” means the Indenture dated as of the date hereof between the
Guarantor and U.S. Bank National Association, not in its individual capacity but solely as trustee, and any indenture supplemental thereto pursuant to which the Debentures are to be issued to the institutional trustee of the Issuer. 

“Issuer” has the meaning set forth in the opening paragraph to this Guarantee. 

“Liquidation Distribution” has the meaning set forth in the definition of “Guarantee Payments” herein. 

“Majority in liquidation amount of the Capital Securities” means Holder(s) of outstanding Capital Securities, voting together
as a class, but separately from the holders of Common Securities, of more than 50% of the aggregate liquidation amount (including the stated amount that would be paid on redemption, liquidation or otherwise, plus accrued and unpaid Distributions to
the date upon which the voting percentages are determined) of all Capital Securities then outstanding. 
 “Obligations”
means any costs, expenses or liabilities (but not including liabilities related to taxes) of the Issuer other than obligations of the Issuer to pay to holders of any Trust Securities the amounts due such holders pursuant to the terms of the Trust
Securities. 
 “Officer’s Certificate” means, with respect to any Person, a certificate signed by one Authorized
Officer of such Person. Any Officer’s Certificate delivered with respect to compliance with a condition or covenant provided for in this Guarantee shall include: 

(a) a statement that the officer signing the Officer’s Certificate has read the covenant or condition and the definitions
relating thereto; 
 (b) a brief statement of the nature and scope of the examination or investigation undertaken by the
officer in rendering the Officer’s Certificate; 
 (c) a statement that the officer has made such examination or
investigation as, in such officer’s opinion, is necessary to enable such officer to express an informed opinion as to whether or not such covenant or condition has been complied with; and 

(d) a statement as to whether, in the opinion of the officer, such condition or covenant has been complied with. 

“Person” means a legal person, including any individual, corporation, estate, partnership, joint venture, association, joint
stock company, limited liability company, trust, unincorporated association, or government or any agency or political subdivision thereof, or any other entity of whatever nature. 

“Redemption Price” has the meaning set forth in the Indenture. 

“Responsible Officer” means, with respect to the Guarantee Trustee, any officer within the Corporate Trust Office of the
Guarantee Trustee including any Vice President, Assistant Vice President, Secretary, Assistant Secretary or any other officer of the Guarantee Trustee customarily performing functions similar to those performed by any of the above designated
officers and also, with respect to a particular corporate trust matter, any other officer to whom such matter is referred because of that officer’s knowledge of and familiarity with the particular subject. 

“Special Event” has the meaning set forth in the Indenture. 

  
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 “Special Redemption Price” has the meaning set forth in the Indenture. 

“Successor Guarantee Trustee” means a successor Guarantee Trustee possessing the qualifications to act as Guarantee Trustee
under Section 3.1. 
 “Trust Securities” means the Common Securities and the Capital Securities. 

ARTICLE II 
 POWERS,
DUTIES AND RIGHTS OF 
 GUARANTEE TRUSTEE 

Section 2.1. Powers and Duties of the Guarantee Trustee. 

(a) This Guarantee shall be held by the Guarantee Trustee for the benefit of the Holders of the Capital Securities, and the Guarantee Trustee
shall not transfer this Guarantee to any Person except a Holder of Capital Securities exercising his or her rights pursuant to Section 4.4(b) or to a Successor Guarantee Trustee on acceptance by such Successor Guarantee Trustee of its
appointment to act as Successor Guarantee Trustee. The right, title and interest of the Guarantee Trustee shall automatically vest in any Successor Guarantee Trustee, and such vesting and cessation of title shall be effective whether or not
conveyancing documents have been executed and delivered pursuant to the appointment of such Successor Guarantee Trustee. 
 (b) If an Event
of Default actually known to a Responsible Officer of the Guarantee Trustee has occurred and is continuing, the Guarantee Trustee shall enforce this Guarantee for the benefit of the Holders of the Capital Securities. 

(c) The Guarantee Trustee, before the occurrence of any Event of Default and after curing all Events of Default that may have occurred, shall
undertake to perform only such duties as are specifically set forth in this Guarantee, and no implied covenants shall be read into this Guarantee against the Guarantee Trustee. In case an Event of Default has occurred (that has not been waived
pursuant to Section 2.4) and is actually known to a Responsible Officer of the Guarantee Trustee, the Guarantee Trustee shall exercise such of the rights and powers vested in it by this Guarantee, and use the same degree of care and skill in
its exercise thereof, as a prudent person would exercise or use under the circumstances in the conduct of his or her own affairs. 
 (d) No
provision of this Guarantee shall be construed to relieve the Guarantee Trustee from liability for its own negligent action, its own negligent failure to act, or its own willful misconduct, except that: 

(i) prior to the occurrence of any Event of Default and after the curing or waiving of all such Events of Default that may have
occurred: 
 (A) the duties and obligations of the Guarantee Trustee shall be determined solely by the express provisions of
this Guarantee, and the Guarantee Trustee shall not be liable except for the performance of such duties and obligations as are specifically set forth in this Guarantee, and no implied covenants or obligations shall be read into this Guarantee
against the Guarantee Trustee; and 
 (B) in the absence of bad faith on the part of the Guarantee Trustee, the Guarantee
Trustee may conclusively rely, as to the truth of the statements and the 

  
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correctness of the opinions expressed therein, upon any certificates or opinions furnished to the Guarantee Trustee and conforming to the requirements of this Guarantee; but in the case of any
such certificates or opinions that by any provision hereof are specifically required to be furnished to the Guarantee Trustee, the Guarantee Trustee shall be under a duty to examine the same to determine whether or not they conform to the
requirements of this Guarantee; 
 (ii) the Guarantee Trustee shall not be liable for any error of judgment made in good
faith by a Responsible Officer of the Guarantee Trustee, unless it shall be proved that such Responsible Officer of the Guarantee Trustee or the Guarantee Trustee was negligent in ascertaining the pertinent facts upon which such judgment was made;

 (iii) the Guarantee Trustee shall not be liable with respect to any action taken or omitted to be taken by it in good
faith in accordance with the written direction of the Holders of not less than a Majority in liquidation amount of the Capital Securities relating to the time, method and place of conducting any proceeding for any remedy available to the Guarantee
Trustee, or relating to the exercise of any trust or power conferred upon the Guarantee Trustee under this Guarantee; and 

(iv) no provision of this Guarantee shall require the Guarantee Trustee to expend or risk its own funds or otherwise incur
personal financial liability in the performance of any of its duties or in the exercise of any of its rights or powers, if the Guarantee Trustee shall have reasonable grounds for believing that the repayment of such funds is not reasonably assured
to it under the terms of this Guarantee or security and indemnity, reasonably satisfactory to the Guarantee Trustee, against such risk or liability is not reasonably assured to it. 

Section 2.2. Certain Rights of Guarantee Trustee. 

(a) Subject to the provisions of Section 2.1: 

(i) The Guarantee Trustee may conclusively rely, and shall be fully protected in acting or refraining from acting upon, any
resolution, certificate, statement, instrument, opinion, report, notice, request, direction, consent, order, bond, debenture, note, other evidence of indebtedness or other paper or document believed by it to be genuine and to have been signed, sent
or presented by the proper party or parties. 
 (ii) Any direction or act of the Guarantor contemplated by this Guarantee
shall be sufficiently evidenced by an Officer’s Certificate. 
 (iii) Whenever, in the administration of this Guarantee,
the Guarantee Trustee shall deem it desirable that a matter be proved or established before taking, suffering or omitting any action hereunder, the Guarantee Trustee (unless other evidence is herein specifically prescribed) may, in the absence of
bad faith on its part, request and conclusively rely upon an Officer’s Certificate of the Guarantor which, upon receipt of such request, shall be promptly delivered by the Guarantor. 

(iv) The Guarantee Trustee shall have no duty to see to any recording, filing or registration of any instrument (or any
re-recording, refiling or re-registration thereof). 
 (v) The Guarantee Trustee may consult with counsel of its selection,
and the advice or opinion of such counsel with respect to legal matters shall be full and complete authorization 

  
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and protection in respect of any action taken, suffered or omitted by it hereunder in good faith and in accordance with such advice or opinion. Such counsel may be counsel to the Guarantor or any
of its Affiliates and may include any of its employees. The Guarantee Trustee shall have the right at any time to seek instructions concerning the administration of this Guarantee from any court of competent jurisdiction. 

(vi) The Guarantee Trustee shall be under no obligation to exercise any of the rights or powers vested in it by this Guarantee
at the request or direction of any Holder, unless such Holder shall have provided to the Guarantee Trustee such security and indemnity, reasonably satisfactory to the Guarantee Trustee, against the costs, expenses (including attorneys’ fees and
expenses and the expenses of the Guarantee Trustee’s agents, nominees or custodians) and liabilities that might be incurred by it in complying with such request or direction, including such reasonable advances as may be requested by the
Guarantee Trustee; provided, however, that nothing contained in this Section 2.2(a)(vi) shall relieve the Guarantee Trustee, upon the occurrence of an Event of Default, of its obligation to exercise the rights and powers vested in
it by this Guarantee. 
 (vii) The Guarantee Trustee shall not be bound to make any investigation into the facts or matters
stated in any resolution, certificate, statement, instrument, opinion, report, notice, request, direction, consent, order, bond, debenture, note, other evidence of indebtedness or other paper or document, but the Guarantee Trustee, in its
discretion, may make such further inquiry or investigation into such facts or matters as it may see fit. 
 (viii) The
Guarantee Trustee may execute any of the trusts or powers hereunder or perform any duties hereunder either directly or by or through agents, nominees, custodians or attorneys, and the Guarantee Trustee shall not be responsible for any misconduct or
negligence on the part of any agent or attorney appointed with due care by it hereunder. 
 (ix) Any action taken by the
Guarantee Trustee or its agents hereunder shall bind the Holders of the Capital Securities, and the signature of the Guarantee Trustee or its agents alone shall be sufficient and effective to perform any such action. No third party shall be required
to inquire as to the authority of the Guarantee Trustee to so act or as to its compliance with any of the terms and provisions of this Guarantee, both of which shall be conclusively evidenced by the Guarantee Trustee’s or its agent’s
taking such action. 
 (x) Whenever in the administration of this Guarantee the Guarantee Trustee shall deem it desirable to
receive instructions with respect to enforcing any remedy or right or taking any other action hereunder, the Guarantee Trustee (i) may request instructions from the Holders of a Majority in liquidation amount of the Capital Securities,
(ii) may refrain from enforcing such remedy or right or taking such other action until such instructions are received, and (iii) shall be protected in conclusively relying on or acting in accordance with such instructions. 

(xi) The Guarantee Trustee shall not be liable for any action taken, suffered, or omitted to be taken by it in good faith,
without negligence, and reasonably believed by it to be authorized or within the discretion or rights or powers conferred upon it by this Guarantee. 

(b) No provision of this Guarantee shall be deemed to impose any duty or obligation on the Guarantee Trustee to perform any act or acts or
exercise any right, power, duty or obligation conferred or imposed on it, in any jurisdiction in which it shall be illegal or in which the Guarantee Trustee shall be unqualified or incompetent in accordance with applicable law to perform any such
act or acts or to exercise any such right, power, duty or obligation. No permissive power or authority available to the Guarantee Trustee shall be construed to be a duty. 

  
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 Section 2.3. Not Responsible for Recitals or Issuance of Guarantee. The recitals
contained in this Guarantee shall be taken as the statements of the Guarantor, and the Guarantee Trustee does not assume any responsibility for their correctness. The Guarantee Trustee makes no representation as to the validity or sufficiency of
this Guarantee. 
 Section 2.4. Events of Default; Waiver. 

(a) An Event of Default under this Guarantee will occur upon the failure of the Guarantor to perform any of its payment or other obligations
hereunder. 
 (b) The Holders of a Majority in liquidation amount of the Capital Securities may, voting or consenting as a class, on behalf
of the Holders of all of the Capital Securities, waive any past Event of Default and its consequences. Upon such waiver, any such Event of Default shall cease to exist, and shall be deemed to have been cured, for every purpose of this Guarantee, but
no such waiver shall extend to any subsequent or other default or Event of Default or impair any right consequent thereon. 
 Section
2.5. Events of Default; Notice. 
 (a) The Guarantee Trustee shall, within 90 days after the occurrence of an Event of Default,
transmit by mail, first class postage prepaid, to the Holders of the Capital Securities and the Guarantor, notices of all Events of Default actually known to a Responsible Officer of the Guarantee Trustee, unless such defaults have been cured before
the giving of such notice, provided, however, that the Guarantee Trustee shall be protected in withholding such notice if and so long as a Responsible Officer of the Guarantee Trustee in good faith determines that the withholding of
such notice is in the interests of the Holders of the Capital Securities. 
 (b) The Guarantee Trustee shall not be deemed to have knowledge
of any Event of Default unless the Guarantee Trustee shall have received written notice from the Guarantor or a Holder of the Capital Securities (except in the case of a payment default), or a Responsible Officer of the Guarantee Trustee charged
with the administration of this Guarantee shall have obtained actual knowledge thereof. 
 ARTICLE III 

GUARANTEE TRUSTEE 

Section 3.1. Guarantee Trustee; Eligibility. 

(a) There shall at all times be a Guarantee Trustee which shall: 

(i) not be an Affiliate of the Guarantor, and 

(ii) be a corporation organized and doing business under the laws of the United States of America or any State or Territory
thereof or of the District of Columbia, or Person authorized under such laws to exercise corporate trust powers, having a combined capital and surplus of at least 50 million U.S. dollars ($50,000,000), and subject to supervision or examination
by Federal, State, Territorial or District of Columbia authority. If such corporation publishes reports of condition at least annually, pursuant to law or to the requirements of the supervising or examining authority referred to above, then, for the
purposes of this Section 3.1(a)(ii), the combined capital and surplus of such corporation shall be deemed to be its combined capital and surplus as set forth in its most recent report of condition so published. 

  
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 (b) If at any time the Guarantee Trustee shall cease to be eligible to so act under
Section 3.1(a), the Guarantee Trustee shall immediately resign in the manner and with the effect set out in Section 3.2(c). 
 (c)
If the Guarantee Trustee has or shall acquire any “conflicting interest” within the meaning of Section 310(b) of the Trust Indenture Act, the Guarantee Trustee shall either eliminate such interest or resign to the extent and in the
manner provided by, and subject to this Guarantee. 
 Section 3.2. Appointment, Removal and Resignation of Guarantee Trustee.

 (a) Subject to Section 3.2(b), the Guarantee Trustee may be appointed or removed without cause at any time by the Guarantor except
during an Event of Default. 
 (b) The Guarantee Trustee shall not be removed in accordance with Section 3.2(a) until a Successor
Guarantee Trustee has been appointed and has accepted such appointment by written instrument executed by such Successor Guarantee Trustee and delivered to the Guarantor. 

(c) The Guarantee Trustee appointed to office shall hold office until a Successor Guarantee Trustee shall have been appointed or until its
removal or resignation. The Guarantee Trustee may resign from office (without need for prior or subsequent accounting) by an instrument in writing executed by the Guarantee Trustee and delivered to the Guarantor, which resignation shall not take
effect until a Successor Guarantee Trustee has been appointed and has accepted such appointment by an instrument in writing executed by such Successor Guarantee Trustee and delivered to the Guarantor and the resigning Guarantee Trustee. 

(d) If no Successor Guarantee Trustee shall have been appointed and accepted appointment as provided in this Section 3.2 within
60 days after delivery of an instrument of removal or resignation, the Guarantee Trustee resigning or being removed may petition any court of competent jurisdiction for appointment of a Successor Guarantee Trustee. Such court may thereupon,
after prescribing such notice, if any, as it may deem proper, appoint a Successor Guarantee Trustee. 
 (e) No Guarantee Trustee shall be
liable for the acts or omissions to act of any Successor Guarantee Trustee. 
 (f) Upon termination of this Guarantee or removal or
resignation of the Guarantee Trustee pursuant to this Section 3.2, the Guarantor shall pay to the Guarantee Trustee all amounts owing to the Guarantee Trustee under Sections 7.2 and 7.3 accrued to the date of such termination, removal or
resignation. 

  
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 ARTICLE IV 

GUARANTEE 
 Section
4.1. Guarantee. 
 (a) The Guarantor irrevocably and unconditionally agrees to pay in full to the Holders the Guarantee
Payments (without duplication of amounts theretofore paid by the Issuer), as and when due, regardless of any defense (except the defense of payment by the Issuer), right of set-off or counterclaim that the Issuer may have or assert. The
Guarantor’s obligation to make a Guarantee Payment may be satisfied by direct payment of the required amounts by the Guarantor to the Holders or by causing the Issuer to pay such amounts to the Holders. 

(b) The Guarantor hereby also agrees to assume any and all Obligations of the Issuer and in the event any such Obligation is not so assumed,
subject to the terms and conditions hereof, the Guarantor hereby irrevocably and unconditionally guarantees to each Beneficiary the full payment, when and as due, of any and all Obligations to such Beneficiaries. This Guarantee is intended to be for
the benefit of, and to be enforceable by, all such Beneficiaries, whether or not such Beneficiaries have received notice hereof. 

Section 4.2. Waiver of Notice and Demand. The Guarantor hereby waives notice of acceptance of this Guarantee and of any
liability to which it applies or may apply, presentment, demand for payment, any right to require a proceeding first against the Issuer or any other Person before proceeding against the Guarantor, protest, notice of nonpayment, notice of dishonor,
notice of redemption and all other notices and demands. 
 Section 4.3. Obligations Not Affected. The obligations, covenants,
agreements and duties of the Guarantor under this Guarantee shall in no way be affected or impaired by reason of the happening from time to time of any of the following: 

(a) the release or waiver, by operation of law or otherwise, of the performance or observance by the Issuer of any express or implied
agreement, covenant, term or condition relating to the Capital Securities to be performed or observed by the Issuer; 
 (b) the extension of
time for the payment by the Issuer of all or any portion of the Distributions, Redemption Price, Special Redemption Price, Liquidation Distribution or any other sums payable under the terms of the Capital Securities or the extension of time for the
performance of any other obligation under, arising out of or in connection with, the Capital Securities (other than an extension of time for payment of Distributions, Redemption Price, Special Redemption Price, Liquidation Distribution or other sum
payable that results from the extension of any interest payment period on the Debentures or any extension of the maturity date of the Debentures permitted by the Indenture); 

(c) any failure, omission, delay or lack of diligence on the part of the Holders to enforce, assert or exercise any right, privilege, power or
remedy conferred on the Holders pursuant to the terms of the Capital Securities, or any action on the part of the Issuer granting indulgence or extension of any kind; 

(d) the voluntary or involuntary liquidation, dissolution, sale of any collateral, receivership, insolvency, bankruptcy, assignment for the
benefit of creditors, reorganization, arrangement, composition or readjustment of debt of, or other similar proceedings affecting, the Issuer or any of the assets of the Issuer; 

(e) any invalidity of, or defect or deficiency in, the Capital Securities; 

  
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 (f) the settlement or compromise of any obligation guaranteed hereby or hereby incurred; or 

(g) any other circumstance whatsoever that might otherwise constitute a legal or equitable discharge or defense of a guarantor, it being the
intent of this Section 4.3 that the obligations of the Guarantor hereunder shall be absolute and unconditional under any and all circumstances. 

There shall be no obligation of the Holders to give notice to, or obtain consent of, the Guarantor with respect to the happening of any of the
foregoing. 
 Section 4.4. Rights of Holders. 

(a) The Holders of a Majority in liquidation amount of the Capital Securities have the right to direct the time, method and place of
conducting any proceeding for any remedy available to the Guarantee Trustee in respect of this Guarantee or to direct the exercise of any trust or power conferred upon the Guarantee Trustee under this Guarantee; provided, however, that
(subject to Section 2.1) the Guarantee Trustee shall have the right to decline to follow any such direction if the Guarantee Trustee being advised by counsel determines that the action or proceeding so directed may not lawfully be taken or if
the Guarantee Trustee in good faith by its board of directors or trustees, executive committees or a trust committee of directors or trustees and/or Responsible Officers shall determine that the action or proceedings so directed would involve the
Guarantee Trustee in personal liability. 
 (b) Any Holder of Capital Securities may institute a legal proceeding directly against the
Guarantor to enforce the Guarantee Trustee’s rights under this Guarantee, without first instituting a legal proceeding against the Issuer, the Guarantee Trustee or any other Person. The Guarantor waives any right or remedy to require that any
such action be brought first against the Issuer, the Guarantee Trustee or any other Person before so proceeding directly against the Guarantor. 

Section 4.5. Guarantee of Payment. This Guarantee creates a guarantee of payment and not of collection. 

Section 4.6. Subrogation. The Guarantor shall be subrogated to all (if any) rights of the Holders of Capital Securities
against the Issuer in respect of any amounts paid to such Holders by the Guarantor under this Guarantee; provided, however, that the Guarantor shall not (except to the extent required by mandatory provisions of law) be entitled to
enforce or exercise any right that it may acquire by way of subrogation or any indemnity, reimbursement or other agreement, in all cases as a result of payment under this Guarantee, if, after giving effect to any such payment, any amounts are due
and unpaid under this Guarantee. If any amount shall be paid to the Guarantor in violation of the preceding sentence, the Guarantor agrees to hold such amount in trust for the Holders and to pay over such amount to the Holders. 

Section 4.7. Independent Obligations. The Guarantor acknowledges that its obligations hereunder are independent of the
obligations of the Issuer with respect to the Capital Securities and that the Guarantor shall be liable as principal and as debtor hereunder to make Guarantee Payments pursuant to the terms of this Guarantee notwithstanding the occurrence of any
event referred to in subsections (a) through (g), inclusive, of Section 4.3 hereof. 
 Section 4.8. Enforcement by a
Beneficiary. A Beneficiary may enforce the obligations of the Guarantor contained in Section 4.1(b) directly against the Guarantor and the Guarantor waives any right or remedy to require that any action be brought against the
Issuer or any other person or entity before proceeding against the Guarantor. The Guarantor shall be subrogated to all rights (if any) of any Beneficiary against the Issuer in respect of any amounts paid to the Beneficiaries by the Guarantor under

  
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this Guarantee; provided, however, that the Guarantor shall not (except to the extent required by mandatory provisions of law) be entitled to enforce or exercise any rights that it
may acquire by way of subrogation or any indemnity, reimbursement or other agreement, in all cases as a result of payment under this Guarantee, if at the time of any such payment, and after giving effect to such payment, any amounts are due and
unpaid under this Guarantee. 
 ARTICLE V 

LIMITATION OF TRANSACTIONS; SUBORDINATION 

Section 5.1. Limitation of Transactions. So long as any Capital Securities remain outstanding, if (a) there shall
have occurred and be continuing an Event of Default or a Declaration Event of Default or (b) the Guarantor shall have selected an Extension Period as provided in the Declaration and such period, or any extension thereof, shall have commenced
and be continuing, then the Guarantor shall not and shall not permit any Affiliate to (x) declare or pay any dividends or distributions on, or redeem, purchase, acquire, or make a liquidation payment with respect to, any of the Guarantor’s
or such Affiliate’s capital stock (other than payments of dividends or distributions to the Guarantor) or make any guarantee payments with respect to the foregoing or (y) make any payment of principal of or interest or premium, if any, on
or repay, repurchase or redeem any debt securities of the Guarantor or any Affiliate that rank pari passu in all respects with or junior in interest to the Debentures (other than, with respect to clauses (x) and (y) above,
(i) repurchases, redemptions or other acquisitions of shares of capital stock of the Guarantor in connection with any employment contract, benefit plan or other similar arrangement with or for the benefit of one or more employees, officers,
directors or consultants, in connection with a dividend reinvestment or stockholder stock purchase plan or in connection with the issuance of capital stock of the Guarantor (or securities convertible into or exercisable for such capital stock) as
consideration in an acquisition transaction entered into prior to the occurrence of the Event of Default, Declaration Event of Default or Extension Period, as applicable, (ii) as a result of any exchange or conversion of any class or series of
the Guarantor’s capital stock (or any capital stock of a subsidiary of the Guarantor) for any class or series of the Guarantor’s capital stock or of any class or series of the Guarantor’s indebtedness for any class or series of the
Guarantor’s capital stock, (iii) the purchase of fractional interests in shares of the Guarantor’s capital stock pursuant to the conversion or exchange provisions of such capital stock or the security being converted or exchanged,
(iv) any declaration of a dividend in connection with any stockholders’ rights plan, or the issuance of rights, stock or other property under any stockholders’ rights plan, or the redemption or repurchase of rights pursuant thereto,
(v) any dividend in the form of stock, warrants, options or other rights where the dividend stock or the stock issuable upon exercise of such warrants, options or other rights is the same stock as that on which the dividend is being paid or
ranks pari passu with or junior to such stock and any cash payments in lieu of fractional shares issued in connection therewith, or (vi) payments under this Guarantee). 

Section 5.2. Ranking. This Guarantee will constitute an unsecured obligation of the Guarantor and will rank subordinate and
junior in right of payment to all present and future Senior Indebtedness (as defined in the Indenture) of the Guarantor. By their acceptance thereof, each Holder of Capital Securities agrees to the foregoing provisions of this Guarantee and the
other terms set forth herein. 
 The right of the Guarantor to participate in any distribution of assets of any of its subsidiaries upon any
such subsidiary’s liquidation or reorganization or otherwise is subject to the prior claims of creditors of that subsidiary, except to the extent the Guarantor may itself be recognized as a creditor of that subsidiary. Accordingly, the
Guarantor’s obligations under this Guarantee will be effectively subordinated to all existing and future liabilities of the Guarantor’s subsidiaries, and claimants should look only to the assets of the Guarantor for payments hereunder.
This Guarantee does not limit the incurrence or issuance of other secured or unsecured debt of the Guarantor, including Senior Indebtedness of the Guarantor, under any indenture that the Guarantor may enter into in the future or otherwise. 

  
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 ARTICLE VI 

TERMINATION 
 Section
6.1. Termination. This Guarantee shall terminate as to the Capital Securities (i) upon full payment of the Redemption Price or Special Redemption Price of all Capital Securities then outstanding, (ii) upon the distribution of
all of the Debentures to the Holders of all of the Capital Securities or (iii) upon full payment of the amounts payable in accordance with the Declaration upon dissolution of the Issuer. This Guarantee will continue to be effective or will be
reinstated, as the case may be, if at any time any Holder of Capital Securities must restore payment of any sums paid under the Capital Securities or under this Guarantee. 

ARTICLE VII 

INDEMNIFICATION 

Section 7.1. Exculpation. 

(a) No Indemnified Person shall be liable, responsible or accountable in damages or otherwise to the Guarantor or any Covered Person for any
loss, damage or claim incurred by reason of any act or omission performed or omitted by such Indemnified Person in good faith in accordance with this Guarantee and in a manner that such Indemnified Person reasonably believed to be within the scope
of the authority conferred on such Indemnified Person by this Guarantee or by law, except that an Indemnified Person shall be liable for any such loss, damage or claim incurred by reason of such Indemnified Person’s negligence or willful
misconduct with respect to such acts or omissions. 
 (b) An Indemnified Person shall be fully protected in relying in good faith upon the
records of the Issuer or the Guarantor and upon such information, opinions, reports or statements presented to the Issuer or the Guarantor by any Person as to matters the Indemnified Person reasonably believes are within such other Person’s
professional or expert competence and who, if selected by such Indemnified Person, has been selected with reasonable care by such Indemnified Person, including information, opinions, reports or statements as to the value and amount of the assets,
liabilities, profits, losses, or any other facts pertinent to the existence and amount of assets from which Distributions to Holders of Capital Securities might properly be paid. 

Section 7.2. Indemnification. 

(a) The Guarantor agrees to indemnify each Indemnified Person for, and to hold each Indemnified Person harmless against, any and all loss,
liability, damage, claim or expense incurred without negligence or willful misconduct on the part of the Indemnified Person, arising out of or in connection with the acceptance or administration of the trust or trusts hereunder, including, but not
limited to, the costs and expenses (including reasonable legal fees and expenses) of the Indemnified Person defending itself against, or investigating, any claim or liability in connection with the exercise or performance of any of the Indemnified
Person’s powers or duties hereunder. The obligation to indemnify as set forth in this Section 7.2 shall survive the resignation or removal of the Guarantee Trustee and the termination of this Guarantee. 

  
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 (b) Promptly after receipt by an Indemnified Person under this Section 7.2 of notice of the
commencement of any action, such Indemnified Person will, if a claim in respect thereof is to be made against the Guarantor under this Section 7.2, notify the Guarantor in writing of the commencement thereof; but the failure so to notify the
Guarantor (i) will not relieve the Guarantor from liability under paragraph (a) above unless and to the extent that the Guarantor did not otherwise learn of such action and such failure results in the forfeiture by the Guarantor of
substantial rights and defenses and (ii) will not, in any event, relieve the Guarantor from any obligations to any Indemnified Person other than the indemnification obligation provided in paragraph (a) above. The Guarantor shall be
entitled to appoint counsel of the Guarantor’s choice at the Guarantor’s expense to represent the Indemnified Person in any action for which indemnification is sought (in which case the Guarantor shall not thereafter be responsible for the
fees and expenses of any separate counsel retained by the Indemnified Person or Persons except as set forth below); provided, however, that such counsel shall be reasonably satisfactory to the Indemnified Person. Notwithstanding the
Guarantor’s election to appoint counsel to represent the Guarantor in an action, the Indemnified Person shall have the right to employ separate counsel (including local counsel), and the Guarantor shall bear the reasonable fees, costs and
expenses of such separate counsel if (i) the use of counsel chosen by the Guarantor to represent the Indemnified Person would present such counsel with a conflict of interest, (ii) the actual or potential defendants in, or targets of, any
such action include both the Indemnified Person and the Guarantor and the Indemnified Person shall have reasonably concluded that there may be legal defenses available to it and/or other Indemnified Person(s) which are different from or additional
to those available to the Guarantor, (iii) the Guarantor shall not have employed counsel satisfactory to the Indemnified Person to represent the Indemnified Person within a reasonable time after notice of the institution of such action or
(iv) the Guarantor shall authorize the Indemnified Person to employ separate counsel at the expense of the Guarantor. The Guarantor will not, without the prior written consent of the Indemnified Persons, settle or compromise or consent to the
entry of any judgment with respect to any pending or threatened claim, action, suit or proceeding in respect of which indemnification or contribution may be sought hereunder (whether or not the Indemnified Persons are actual or potential parties to
such claim or action) unless such settlement, compromise or consent includes an unconditional release of each Indemnified Person from all liability arising out of such claim, action, suit or proceeding. 

Section 7.3. Compensation; Reimbursement of Expenses. The Guarantor agrees: 

(a) to pay to the Guarantee Trustee from time to time such compensation for all services rendered by it hereunder as the parties shall agree
to from time to time (which compensation shall not be limited by any provision of law in regard to the compensation of a trustee of an express trust); and 

(b) except as otherwise expressly provided herein, to reimburse the Guarantee Trustee upon request for all reasonable expenses, disbursements
and advances incurred or made by it in accordance with any provision of this Guarantee (including the reasonable compensation and the expenses and disbursements of its agents and counsel), except any such expense, disbursement or advance as may be
attributable to its negligence or willful misconduct. 
 For purposes of clarification, this Section 7.3 does not contemplate the
payment by the Guarantor of acceptance or annual administration fees owing to the Guarantee Trustee for services to be provided by the Guarantee Trustee under this Guarantee or the fees and expenses of the Guarantee Trustee’s counsel in
connection with the closing of the transactions contemplated by this Guarantee. The provisions of this Section 7.3 shall survive the resignation or removal of the Guarantee Trustee and the termination of this Guarantee. 

  
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 ARTICLE VIII 

MISCELLANEOUS 
 Section
8.1. Successors and Assigns. All guarantees and agreements contained in this Guarantee shall bind the successors, assigns, receivers, trustees and representatives of the Guarantor and shall inure to the benefit of the Holders of the
Capital Securities then outstanding. Except in connection with any merger or consolidation of the Guarantor with or into another entity or any sale, transfer or lease of the Guarantor’s assets to another entity, in each case, to the extent
permitted under the Indenture, the Guarantor may not assign its rights or delegate its obligations under this Guarantee without the prior approval of the Holders of at least a Majority in liquidation amount of the Capital Securities. 

Section 8.2. Amendments. Except with respect to any changes that do not adversely affect the rights of Holders of the
Capital Securities in any material respect (in which case no consent of Holders will be required), this Guarantee may be amended only with the prior approval of the Holders of not less than a Majority in liquidation amount of the Capital Securities.
The provisions of the Declaration with respect to amendments thereof apply to the giving of such approval. 
 Section 8.3.
Notices. All notices provided for in this Guarantee shall be in writing, duly signed by the party giving such notice, and shall be delivered, telecopied or mailed by first class mail, as follows: 

(a) If given to the Guarantee Trustee, at the Guarantee Trustee’s mailing address set forth below (or such other address as the Guarantee
Trustee may give notice of to the Holders of the Capital Securities and the Guarantor): 
 U.S. Bank National Association 

225 Asylum Street, Goodwin Square 

Hartford, Connecticut 06103 

Attention: Corporate Trust Services Division 

Telecopy: 860-241-6889 
 With a
copy to: 
 U.S. Bank National Association 

1 Federal Street - 3rd Floor 

Boston, Massachusetts 02110 

Attention: Paul D. Allen, Corporate Trust Services Division 

Telecopy: 617-603-6665 
 (b) If
given to the Guarantor, at the Guarantor’s mailing address set forth below (or such other address as the Guarantor may give notice of to the Holders of the Capital Securities and to the Guarantee Trustee): 

Great Western Bancorporation, Inc. 

10834 Old Mill Rd., Suite One 

Omaha, Nebraska 68154-2648 

Attention: Daniel A. Hamann 

Telecopy: 402-333-8339 

  
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 (c) If given to any Holder of the Capital Securities, at the address set forth on the books and
records of the Issuer. 
 All such notices shall be deemed to have been given when received in person, telecopied with receipt confirmed, or
mailed by first class mail, postage prepaid, except that if a notice or other document is refused delivery or cannot be delivered because of a changed address of which no notice was given, such notice or other document shall be deemed to have been
delivered on the date of such refusal or inability to deliver. 
 Section 8.4. Benefit. This Guarantee is solely for
the benefit of the Beneficiaries and, subject to Section 2.1(a), is not separately transferable from the Capital Securities. 
 Section
8.5. Governing Law. THIS GUARANTEE SHALL BE GOVERNED BY, AND CONSTRUED AND INTERPRETED IN ACCORDANCE WITH, THE LAW OF THE STATE OF NEW YORK, WITHOUT REGARD TO CONFLICT OF LAWS PRINCIPLES THEREOF (OTHER THAN SECTION 5-1401 OF THE NEW YORK
GENERAL OBLIGATIONS LAW). 
 Section 8.6. Counterparts. This Guarantee may be executed in one or more counterparts,
each of which shall be an original, but all of which taken together shall constitute one and the same instrument. 
 Section 8.7.
Separability. In case one or more of the provisions contained in this Guarantee shall for any reason be held to be invalid, illegal or unenforceable in any respect, such invalidity, illegality or unenforceability shall not affect any
other provisions of this Guarantee, but this Guarantee shall be construed as if such invalid or illegal or unenforceable provision had never been contained herein. 

Signatures appear on the following page 

  
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 THIS GUARANTEE is executed as of the day and year first above written. 

 

			
	 GREAT WESTERN BANCORPORATION, INC.,

as Guarantor

		
	By:	 	 /s/ Deryl F. Hamann

		 	Name: Deryl F. Hamann
		 	Title: Chairman & CEO

  

			
	U.S. BANK NATIONAL ASSOCIATION, as Guarantee Trustee
		
	By:	 	 /s/ Paul D. Allen

		 	Name: Paul D. Allen
		 	Title: Vice President

  
 16

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