ZIONS BANCORPORATION 21,077,227 Warrants UNDERWRITING AGREEMENT

EXHIBIT 1.1

Execution Version

ZIONS BANCORPORATION

21,077,227 Warrants

UNDERWRITING AGREEMENT

May 19, 2010

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Deutsche Bank Securities Inc.

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Ladies and Gentlemen:

Zions Bancorporation, (the “Company”), a corporation organized under the laws of the State of Utah, proposes, subject to the terms and conditions stated herein, to issue and sell to the several underwriters named in Schedule I hereto (the “Underwriters”), for whom you are acting as the representatives (the “Representatives”), an aggregate of 21,077,227 warrants of the Company (the “Firm Warrants”) and, at the election of the Underwriters, up to an aggregate of 1,204,413 additional warrants of the Company (the “Optional Warrants”, together with the Firm Warrants, the “Warrants”), initially representing the right to purchase an aggregate of up to that same number of shares (the “Warrant Shares”) of the Company’s common stock, no par value (the “Common Stock”), pursuant to this underwriting agreement (this “Underwriting Agreement”). The respective maximum number of the Firm Warrants to be so purchased by the several Underwriters are set forth opposite their names in Schedule I hereto.

As the Representatives, you have advised the Company that (a) you are authorized to enter into this Underwriting Agreement on behalf of the several Underwriters, and (b) the several Underwriters are willing, acting severally and not jointly, to purchase the numbers of Warrants set forth opposite their respective names in Schedule I.

Section 1. Representations and Warranties. The Company hereby represents and warrants to, and agrees with each of the Underwriters that, as of the date of this Underwriting Agreement:

(a) The Offering Documents. An “automatic shelf registration statement” as defined under Rule 405 under the Securities Act of 1933, as amended (the “Act”), on Form S-3 (File No. 333-158319), with respect to the Warrants, the Warrant Shares and other securities, including a form of prospectus, was filed by the Company with the Securities and Exchange Commission (the “Commission”) not earlier than three years prior to the date hereof; such registration statement, and any post-effective amendment thereto, became effective on filing; and no stop order suspending the effectiveness of such registration statement or any part thereof has been issued and no proceeding for that purpose has been initiated or, to the knowledge of the Company, threatened by the Commission, and no notice of objection of the Commission to the use of such form of registration statement or any post-effective amendment thereto pursuant to Rule 401(g)(2) under the Act has been received by the Company (the base prospectus filed as

part of such registration statement, in the form in which it has most recently been filed with the Commission on or prior to the date of this Underwriting Agreement, is hereinafter called the “Basic Prospectus”; the various parts of such registration statement, excluding any Form T-1 but including all exhibits thereto and any prospectus supplement relating to the Warrants that is filed with the Commission and deemed by virtue of Rule 430B to be part of such registration statement, each as amended at the time such part of the registration statement became effective, are hereinafter collectively called the “Registration Statement”; the Basic Prospectus, as amended and supplemented immediately prior to the Applicable Time (as defined in Section 1(c) hereof), is hereinafter called the “Pricing Prospectus”; any preliminary prospectus (including any preliminary prospectus supplement) specifically relating to the Warrants filed with the Commission pursuant to Rule 424(b) under the Act is hereinafter called a “Preliminary Prospectus”; the form of final prospectus specifically relating to the Warrants filed with the Commission pursuant to Rule 424 under the Act in accordance with Section 5(a) hereof, is hereinafter called the “Prospectus”; any reference herein to the Basic Prospectus, the Pricing Prospectus, any Preliminary Prospectus or the Prospectus shall be deemed to refer to and include the documents incorporated by reference therein pursuant to Item 12 of Form S-3 under the Act, as of the date of such prospectus; any reference to any amendment or supplement to the Basic Prospectus, any Preliminary Prospectus or the Prospectus shall be deemed to refer to and include any post-effective amendment to the Registration Statement, any prospectus supplement relating to the Warrants filed with the Commission pursuant to Rule 424(b) under the Act and any documents filed under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and incorporated therein, in each case after the date of the Basic Prospectus, such Preliminary Prospectus or the Prospectus, as the case may be; any reference to any amendment to the Registration Statement shall be deemed to refer to and include any annual report of the Company filed pursuant to Section 13(a) or 15(d) of the Exchange Act after the effective date of the Registration Statement that is incorporated by reference in the Registration Statement; and any “issuer free writing prospectus” as defined in Rule 433 under the Act relating to the Warrants is hereinafter called an “Issuer Free Writing Prospectus”).

(b) Preliminary Prospectus. No order preventing or suspending the use of any Preliminary Prospectus or any Issuer Free Writing Prospectus has been issued by the Commission, and each Preliminary Prospectus, at the time of filing thereof, conformed in all material respects to the requirements of the Act and the rules and regulations of the Commission thereunder, and did not contain an untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading; provided, however, that this representation and warranty shall not apply to any statements or omissions made in reliance upon and in conformity with information furnished in writing to the Company by an Underwriter through either of the Representatives specifically for use therein.

(c) Pricing Disclosure Package. For the purposes of this Underwriting Agreement, the “Applicable Time” is 6:40 p.m., New York City time, on the date of this Underwriting Agreement; the Pricing Prospectus as supplemented by the final term sheet prepared and filed pursuant to Section 5(a) hereof, taken together (collectively, the “Pricing Disclosure Package”) as of the Applicable Time, did not include any untrue statement of a material fact or omit to state any material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading; and each Issuer Free Writing Prospectus listed on Schedule II(a) hereto does not conflict with the information contained in the Registration Statement, the Pricing Prospectus or the Prospectus and each such Issuer Free Writing Prospectus, as supplemented by and taken together with the Pricing Disclosure Package as of the Applicable Time, did not include any untrue statement of a material fact or omit to state any material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading; provided, however, that this representation and warranty shall not apply to statements or omissions made in reliance upon and in conformity with information furnished in writing to the Company by an Underwriter through either of the Representatives specifically for use therein.

(d) Incorporated Documents. The documents incorporated by reference in the Pricing Prospectus and the Prospectus, when they became effective or were filed with the Commission, as the case may be, conformed in all material respects to the applicable requirements of the Act or the Exchange Act, as applicable, and the rules and regulations of the Commission thereunder, and none of such documents, when they became effective or were filed with the Commission, contained an untrue statement of a material fact or omitted to state a material fact required to be stated therein or necessary to make the statements therein, in light of the circumstances under which they were made, not misleading; and any further documents so filed and incorporated by reference in the Prospectus or any further amendment or supplement thereto, when such documents become effective or are filed with the Commission, as the case may be, will conform in all material respects to the applicable requirements of the Act or the Exchange Act, as applicable, and the rules and regulations of the Commission thereunder and will not contain an untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein, in light of the circumstances under which they were made, not misleading; provided, however, that this representation and warranty shall not apply to any statements or omissions made in reliance upon and in conformity with information furnished in writing to the Company by an Underwriter through either of the Representatives specifically for use therein; no such documents were filed with the Commission since the Commission’s close of business on the business day immediately prior to the date of this Underwriting Agreement and prior to the execution of this Underwriting Agreement except as set forth on Schedule II(b) hereto; and the financial statements of the Company and its consolidated subsidiaries incorporated by reference in the Registration Statement, the Pricing Prospectus and the Prospectus, together with the related schedules and notes, present fairly in all material respects the financial position of the Company and its consolidated subsidiaries at the dates indicated and the results of operations and cash flows for the periods shown in such financial statements and, except as otherwise disclosed in the Registration Statement, the Pricing Prospectus and the Prospectus, such financial statements have been prepared or will be prepared in conformity with generally accepted accounting principles in the United States applied on a consistent basis.

(e) Registration Statement and Prospectus. The Registration Statement conforms, and the Prospectus and any further amendments or supplements to the Registration Statement and the Prospectus will conform, in all material respects to the requirements of the Act and the rules and regulations of the Commission thereunder and do not and will not, as of the applicable effective date as to each part of the Registration Statement and as of the applicable filing date as to the Prospectus and any amendment or supplement thereto, contain an untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein not misleading; provided, however, that this representation and warranty shall not apply to any statements or omissions made in reliance upon and in conformity with information furnished in writing to the Company by an Underwriter through either of the Representatives specifically for use therein.

(f) No Material Adverse Change. Neither the Company nor any of its subsidiaries has sustained since the date of the latest audited financial statements included or incorporated by reference in the Pricing Prospectus any material loss or interference with its business from fire, explosion, flood or other calamity, whether or not covered by insurance, or from any labor dispute or court or governmental action, order or decree, otherwise than as set forth or contemplated in the Pricing Prospectus; and, since the respective dates as of which information is given in the Registration Statement and the Pricing Prospectus, there has not been any change in the capital stock (other than (i) repurchases of Common Stock of the Company in an aggregate amount that is less than 2% of the number of outstanding shares of Common Stock as of the time this representation is given or deemed given, (ii) as contemplated by the concurrent transactions described in the Pricing Prospectus and any documents incorporated by reference

therein and (iii) issuances of or other transfers of capital stock in the ordinary course of business pursuant to the Company’s employee benefit plans or awards issued thereunder or its dividend reinvestment plan) or long-term debt of the Company or any of its subsidiaries or any material adverse change, or any development involving a prospective material adverse change, in or affecting the financial condition, results of operations, shareholders’ equity, business or properties of the Company and its subsidiaries, taken as a whole, otherwise than as disclosed, set forth or contemplated in the Pricing Prospectus.

(g) Organization and Good Standing. The Company has been duly incorporated and is validly existing as a corporation in good standing under the laws of the jurisdiction of its incorporation, with power and authority (corporate and other) to own its properties and conduct its business as described in the Pricing Prospectus. Each of the significant subsidiaries (as defined in Rule 1-02 of Regulation S-X of the Commission) (each, a “Significant Subsidiary”) of the Company has been duly incorporated and is validly existing as a corporation in good standing under the laws of its jurisdiction of incorporation; and all of the issued shares of capital stock of each such Significant Subsidiary have been duly and validly authorized and issued, are fully paid and non-assessable, and (except for directors’ qualifying shares) are owned directly or indirectly by the Company, free and clear of all liens, encumbrances, equities or claims. The Company has been duly qualified as a foreign corporation for the transaction of business and is in good standing under the laws of each other jurisdiction in which it owns or leases properties or conducts any business so as to require such qualification, or is subject to no material liability or disability by reason of the failure to be so qualified in any such jurisdiction.

(h) Capitalization. The Company has an authorized capitalization as set forth in the Pricing Prospectus, and all of the issued shares of capital stock of the Company have been duly and validly authorized and issued and are fully paid and non-assessable and have been issued in compliance in all material respects with applicable federal and state securities laws. None of the outstanding shares of Common Stock were issued in violation of any preemptive rights, rights of first refusal or other similar rights to subscribe for or purchase securities of the Company. Except as described in the Registration Statement and the Pricing Prospectus, and except with respect to equity awards issued under the Company’s equity incentive plans or pursuant to the Securities Purchase Agreement, by the Company and the United States Department of the Treasury under the Troubled Asset Relief Program Capital Purchase Program (the “CPP Agreement”), there are no outstanding options, warrants, preemptive rights, rights of first refusal or other rights to purchase, or equity or debt securities convertible into or exchangeable or exercisable for, any capital stock of the Company.

(i) Underwriting Agreement. This Underwriting Agreement has been duly authorized, executed and delivered by the Company.

(j) The Warrants and the Warrant Agreement. The Warrants have been duly authorized by the Company, and, when issued and delivered by the Company pursuant to this Underwriting Agreement, such Warrants will have been duly executed, authenticated, issued and delivered and will constitute valid and legally binding obligations of the Company entitled to the benefits provided by the warrant agreement, to be dated as of May 25, 2010 (the “Warrant Agreement”) between the Company and Zions First National Bank, as warrant agent, under which the Warrants are to be issued; the Warrant Agreement has been duly authorized and, at the First Time of Delivery (as defined in Section 4(a) hereof), will constitute a valid and legally binding instrument, enforceable in accordance with its terms, subject, as to enforcement, to bankruptcy, insolvency, reorganization and other laws of general applicability relating to or affecting creditors’ rights and to general equity principles; the Warrants conform and the Warrant Agreement will conform in all material respects to the descriptions thereof in the Pricing Prospectus; and the form of certificate for the Warrants conforms to the corporate law of the jurisdiction of the Company’s incorporation and to any requirements of the Company’s organizational documents.

(k) The Warrant Shares. The Warrant Shares have been duly authorized by the Company, and, when issued and delivered upon exercise of the Warrants pursuant to the terms thereof, will be fully paid and non-assessable and will not be subject to any preemptive or similar rights. The Warrant Shares conform, as of the date hereof and as of each Time of Delivery (as defined in Section 4(a) hereof), in all material respects to the description thereof set forth in the Pricing Prospectus. The form of certificates for the Warrant Shares conforms to the corporate law of the jurisdiction of the Company’s incorporation and to any requirements of the Company’s organizational documents. The Company has duly authorized the reservation of the Warrant Shares.

(l) Description of Transaction Documents. The statements set forth in the Pricing Prospectus and the Prospectus under the captions “Description of Our Capital Stock” and “Description of Warrants,” insofar as they purport to constitute a summary of the terms of the Warrants and the Warrant Shares, and under the captions “Certain United States Federal Income Tax Considerations,” “United States Taxation,” “Benefit Plan Investor Considerations” and “Underwriting,” insofar as they purport to describe the provisions of the laws and documents referred to therein, are accurate, complete and fair.

(m) No Registration Rights by Others. Except as contemplated by the CPP Agreement, there are no persons with registration or other similar rights to have any equity or debt securities registered for sale under the Registration Statement or included in the offering contemplated by this Underwriting Agreement, except for such rights as have been duly waived.

(n) No Broker’s Fees. Other than the Underwriters, there is no broker, finder or other party that is entitled to receive from the Company any brokerage or finder’s fee or other fee or commission as a result of any transactions contemplated by this Underwriting Agreement.

(o) No Conflicts; No Consents and Approvals Required (Company). The issuance and sale of the Warrants, the execution and delivery by the Company of this Underwriting Agreement, the compliance by the Company with all of the provisions of the Warrants, the Warrant Agreement and this Underwriting Agreement, and the consummation of the transactions herein and therein contemplated will not conflict with or result in a breach or violation of any of the terms or provisions of, or constitute a default under (or, with the giving of notice or lapse of time, constitute a default under), (i) any indenture, loan agreement or mortgage, deed of trust or other agreement or instrument to which the Company is a party or by which the Company is bound or to which any of the property or assets of the Company is subject, (ii) the Restated Articles of Incorporation, as amended, or the Restated Bylaws of the Company or (iii) any statute or any order, rule or regulation of any court or governmental agency or body having jurisdiction over the Company or any of its properties, except where, for purposes of clauses (i) and (iii), such conflict, breach, violation or default would not, individually or in the aggregate, have a material adverse effect on the current or future financial condition, results of operations, shareholders’ equity, business or properties of the Company and its subsidiaries, taken as a whole (a “Material Adverse Effect”); and no consent, approval, authorization, order, registration or qualification of or with any such court or governmental agency or body is required for the issuance and sale of the Warrants, the execution and delivery by the Company of the Warrant Agreement and this Underwriting Agreement, or the consummation by the Company of the transactions contemplated by this Underwriting Agreement, except such as have been obtained under the Act and such consents, approvals, authorizations, registrations or qualifications as may be required under state securities or “blue sky” laws in connection with the sale of the Warrants by the Underwriters.

(p) No Violation or Default. Neither the Company nor any of its Significant Subsidiaries is (i) in violation of the Restated Articles of Incorporation, as amended, the Restated Bylaws of the Company, the charter or bylaws of any of the Significant Subsidiaries, as applicable, (ii) in default (or, with the giving of notice or lapse of time would be in default) in the performance or observance of any obligation,

agreement, covenant or condition contained in any indenture, loan agreement, mortgage, deed of trust or other agreement or instrument to which it is a party or by which it or any of its properties may be bound or (iii) in violation of any statute, law, rule, regulation, judgment, order or decree of any court, regulatory body, administrative agency, governmental body, arbitrator or other authority having jurisdiction over the Company or any of the Significant Subsidiaries, except where, for purposes of clauses (ii) and (iii), such default or violation would not, individually or in the aggregate, have a Material Adverse Effect.

(q) Legal Proceedings. Other than as set forth in the Pricing Prospectus, there are no legal or governmental proceedings pending to which the Company or any of its subsidiaries is a party or of which any property of the Company or any of its subsidiaries is the subject which, if determined adversely to the Company or any of its subsidiaries, would individually or in the aggregate have a Material Adverse Effect; and, to the best of the Company’s knowledge, no such proceedings are threatened or contemplated by governmental authorities or threatened by others.

(r) Investment Company Act. The Company is not and, after giving effect to the offering and sale of the Warrants as herein contemplated and the application of the proceeds thereof as described in the Pricing Prospectus, will not be an “investment company,” as such term is defined in the Investment Company Act of 1940, as amended (the “Investment Company Act”).

(s) Well-Known Seasoned Issuer. (A) (i) At the time of filing the Registration Statement, (ii) at the time of the most recent amendment thereto for the purposes of complying with Section 10(a)(3) of the Act (whether such amendment was by post-effective amendment, incorporated report filed pursuant to Section 13 or 15(d) of the Exchange Act or form of prospectus) and (iii) at the time the Company or any person acting on its behalf (within the meaning, for this clause only, of Rule 163(c) under the Act) made any offer relating to the Warrants in reliance on the exemption of Rule 163 under the Act, the Company was a “well-known seasoned issuer” as defined in Rule 405 under the Act; and (B) at the earliest time after the filing of the Registration Statement that the Company or another offering participant made a bona fide offer (within the meaning of Rule 164(h)(2) under the Act) of the Warrants, the Company was not an “ineligible issuer” as defined in Rule 405 under the Act.

(t) Independent Accountants. Ernst & Young LLP, who have certified certain financial statements of the Company and its subsidiaries and have audited the Company’s internal control over financial reporting, are independent public accountants as required by the Act and the Exchange Act and the rules and regulations of the Commission thereunder.

(u) Accounting Controls. The Company maintains a system of internal control over financial reporting (as such term is defined in Rule 13a-15(f) under the Exchange Act) that complies with the requirements of the Exchange Act and has been designed by the Company’s principal executive officer and principal financial officer, or under their supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. The Company’s internal control over financial reporting would have been effective as of December 31, 2009, but for the material weakness disclosed in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2009. The Company is not aware of any material weaknesses in its internal control over financial reporting. Since the date of the latest audited financial statements included or incorporated by reference in the Pricing Prospectus, there has been no change in the Company’s internal control over financial reporting that has materially adversely affected, or is reasonably likely to materially adversely affect, the Company’s internal control over financial reporting.

(v) Disclosure Controls. The Company maintains disclosure controls and procedures (as such term is defined in Rule 13a-15(e) under the Exchange Act) that comply with the requirements of the

Exchange Act; such disclosure controls and procedures have been designed to ensure that material information relating to the Company and its subsidiaries is made known to the Company’s principal executive officer and principal financial officer by others within those entities; and such disclosure controls and procedures are effective.

(w) Financial Holding Company. The Company is a financial holding company registered under the Bank Holding Company Act of 1956, as amended; and each of the Company’s banking subsidiaries holds the requisite authority from its respective banking regulatory authority to do business as a national banking association under the laws of the United States or as a state-chartered banking corporation under the laws of such subsidiary’s jurisdiction of incorporation, as the case may be.

(x) OFAC. Neither the Company nor any of its subsidiaries nor, to the knowledge of the Company, any director, officer, agent or employee of the Company or any of its subsidiaries (in their capacity as such) is currently subject to any U.S. sanctions administered by the Office of Foreign Assets Control of the U.S. Treasury Department (“OFAC”); and the Company will not directly or indirectly use the proceeds of the offering, or lend, contribute or otherwise make available such proceeds, to any subsidiary, joint venture partner or other person or entity, for the purpose of financing the activities of any person currently subject to any U.S. sanctions administered by OFAC.

(y) Compliance with Regulators. The Company and its Significant Subsidiaries are in compliance with all applicable laws administered by and regulations of the Board of Governors of the Federal Reserve System, the Federal Deposit Insurance Corporation, the Office of the Comptroller of the Currency and any other federal or state bank regulatory authority with jurisdiction over the Company or any such Significant Subsidiary, other than where such failures to comply would not, individually or in the aggregate, have a Material Adverse Effect.

(z) Licenses and Permits. The Company and its subsidiaries possess all certificates, licenses, authorizations and permits issued by the appropriate federal, state or foreign regulatory authorities necessary to conduct their respective businesses, and neither the Company nor any of its subsidiaries has received any notice of proceedings relating to the revocation or modification of any such certificate, license, authorization or permit, in each case except for such certificates, licenses, authorizations and permits which the failure to have or the revocation or modification of which would not, individually or in the aggregate have a Material Adverse Effect.

(aa) No Agreements with Regulators. There are no written agreements or other written statements as described under 12 U.S.C. 1818(u) between any federal banking agency and the Company or any of its subsidiaries (whether or not such federal banking agency has determined that publication would be contrary to the public interest) and there are no agreements, memoranda of understanding, cease and desist orders, orders of prohibition or suspension or consent decrees between any federal or state regulatory authority and the Company or any of its subsidiaries, in each case other than such agreements, memoranda of understanding, cease and desist orders, orders of prohibition or suspension or consent decrees as would not, individually or in the aggregate, have a Material Adverse Effect.

(bb) Anti-Money Laundering. The operations of the Company and its subsidiaries are and have been conducted at all times in compliance with all applicable financial recordkeeping and reporting requirements, including those of the Bank Secrecy Act, as amended by Title III of the Uniting and Strengthening America by Providing Appropriate Tools Required to Intercept and Obstruct Terrorism Act of 2001 (USA PATRIOT Act), and the applicable anti-money laundering statutes of jurisdictions where the Company and its subsidiaries conduct business, the rules and regulations thereunder and any related or similar rules, regulations or guidelines, issued, administered or enforced by any governmental agency (collectively, the “Anti-Money Laundering Laws”), except where the failure to so comply would not,

individually or in the aggregate, have a Material Adverse Effect, and no action, suit or proceeding by or before any court or governmental agency, authority or body or any arbitrator involving the Company or any of its subsidiaries with respect to the Anti-Money Laundering Laws is pending or, to the knowledge of the Company, threatened that would, individually or in the aggregate, have a Material Adverse Effect.

(cc) Stabilization. The Company has not taken and will not take, directly or indirectly, any action designed to or that might be reasonably expected to cause or result in stabilization or manipulation of the price of any security of the Company to facilitate the sale or resale of the Warrants.

(dd) Officers’ Certificate. Any certificate signed by any officer of the Company delivered to the Underwriters or to counsel for the Underwriters pursuant to or in connection with this Underwriting Agreement shall be deemed a representation and warranty by the Company to the Underwriters as to the matters covered thereby as of the date or dates indicated in such certificate.

Section 2. Sale and Delivery of Warrants.

(a) The Company hereby grants to each of the Underwriters the right to purchase at their election up to the number of Optional Warrants set forth opposite the name of such Underwriter in Schedule I hereto on the terms referred to in this Section 2 for the sole purpose of covering over-allotments in the sale of the Firm Warrants. Any such election to purchase Optional Warrants may be exercised by written notice from the Representatives to the Company given within a period of 30 calendar days after the date of this Underwriting Agreement, setting forth the aggregate number of Optional Warrants to be purchased and the date on which such Optional Warrants are to be delivered, as determined by the Representatives, but in no event earlier than the First Time of Delivery (as defined in Section 4(a) hereof) or, unless the Representatives and the Company otherwise agree in writing, no earlier than two or later than ten business days after the date of such notice.

(b) Subject to the terms and conditions set forth herein, (1) the Company agrees to sell to each of the Underwriters and each of the Underwriters agrees, severally and not jointly, to purchase from the Company, at a purchase price per Warrant of $8.3028, the number of Firm Warrants set forth opposite the name of such Underwriter in Schedule I hereto and (2) in the event and to the extent that the Underwriters shall exercise the election to purchase Optional Warrants, as provided below, the Company agrees to issue and sell to each of the Underwriters, and each of the Underwriters agrees, severally and not jointly, to purchase from the Company, up to an aggregate of 1,204,413 Optional Warrants at the same purchase price per Warrant as the Underwriters shall pay for the Firm Warrants. The number of Optional Warrants to be added to the number of Firm Warrants to be purchased by each Underwriter as set forth in Schedule I hereto shall be, in each case, the number of Optional Warrants which the Company have been advised by the Representatives has been attributed to such Underwriter; provided, that, if the Company has not been so advised, the number of Optional Warrants to be so added shall be, in each case, that proportion of Optional Warrants which the number of Firm Warrants to be purchased by such Underwriter under this Underwriting Agreement bears to the aggregate number of Firm Warrants (rounded as the Representatives may determine so as to eliminate fractional Warrants). The total number of Warrants to be purchased by all the Underwriters pursuant to this Underwriting Agreement shall be the aggregate number of Firm Warrants as set forth in Schedule I hereto plus the aggregate number of Optional Warrants which the Underwriters elect to purchase.

(c) The Company hereby agrees to pay, at each Time of Delivery to ▇▇▇▇▇▇▇, ▇▇▇▇▇ & Co., for the accounts of the several Underwriters, an amount equal to $0.2490 per Warrant to be delivered at each Time of Delivery, as compensation to the Underwriters for their commitments hereunder.

Section 3. Offering by the Underwriters. Upon authorization by you of the release of the Warrants, the several Underwriters propose to offer the Warrants for sale upon the terms and conditions set forth in the Prospectus. It is further understood that you will act as the Representatives for the Underwriters in the offering and sale of the Warrants.

Section 4. Delivery of the Warrants.

(a) The Warrants to be purchased by each Underwriter hereunder will be represented by one or more definitive global securities in book-entry form which will be deposited by or on behalf of the Company with The Depository Trust Company (“DTC”) or its designated custodian. The Company will deliver the Warrants to ▇▇▇▇▇▇▇, Sachs & Co., for the account of each Underwriter, against payment by or on behalf of such Underwriter of the purchase price therefor by wire transfer of Federal (same-day) funds to the account specified by the Company to ▇▇▇▇▇▇▇, ▇▇▇▇▇ & Co. at least forty-eight hours in advance, by causing DTC to credit the Warrants to the account of ▇▇▇▇▇▇▇, Sachs & Co. at DTC. The Company will cause the global security or securities, as applicable, representing the Warrants to be made available to ▇▇▇▇▇▇▇, ▇▇▇▇▇ & Co. for checking at least twenty-four hours prior to each Time of Delivery at the office of DTC or its designated custodian (the “Designated Office”). The time and date of such delivery and payment shall be (i) with respect to the Firm Warrants, at 9:30 a.m., New York City time, on May 25, 2010 or such other time and date as the Representatives and the Company may agree upon in writing, such time and date are herein called the “First Time of Delivery” and (ii) with respect to the Optional Warrants, if any, in the manner and at the time and date specified by the Representatives in the written notice given by the Representatives of the Underwriters’ election to purchase such Optional Warrants, or at such other time and date as the Representatives and the Company may agree upon in writing, such time and date, if not the First Time of Delivery, are herein called the “Second Time of Delivery.” Each such time and date is herein called a “Time of Delivery.”

(b) The documents to be delivered at each Time of Delivery by or on behalf of the parties hereto pursuant to Section 8 hereof, including the cross-receipt for the Warrants and any additional documents requested by the Underwriters pursuant to Section 8(k) hereof, will be delivered at the offices of ▇▇▇▇▇▇ ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ & ▇▇▇▇▇▇▇▇ LLP, ▇▇▇ ▇▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇ ▇▇▇▇, ▇▇▇ ▇▇▇▇ ▇▇▇▇▇ (the “Closing Location”), and the Warrants will be delivered at the Designated Office, all at each Time of Delivery. A meeting will be held at the Closing Location at 1:00 p.m., New York City time, on the New York Business Day next preceding each Time of Delivery, at which meeting the final drafts of the documents to be delivered pursuant to the preceding sentence will be available for review by the parties hereto. “New York Business Day” shall mean each Monday, Tuesday, Wednesday, Thursday and Friday which is not a day on which banking institutions in New York City are generally authorized or obligated by law or executive order to close.

Section 5. Covenants. The Company agrees with each of the Underwriters:

(a) Required Filings; Notice to the Representatives. To prepare the Prospectus in a form approved by the Representatives and to file such Prospectus pursuant to Rule 424(b) under the Act not later than the Commission’s close of business on the second business day following the date of this Underwriting Agreement; to make no further amendment or any supplement to the Registration Statement, the Basic Prospectus or the Prospectus prior to any Time of Delivery which shall be disapproved by the Representatives promptly after reasonable notice thereof; so long as the delivery of a prospectus (or in lieu thereof, the notice referred to in Rule 173(a) under the Act) is required in connection with the offering or sale of the Warrants to advise the Representatives, promptly after it receives notice thereof, of the time when any amendment to the Registration Statement has been filed or becomes effective or any amendment or supplement to the Prospectus has been filed and to furnish the Underwriters with copies thereof; to prepare a final term sheet, containing solely a description of the

Warrants in a form approved by the Representatives and to file such term sheet pursuant to Rule 433(d) under the Act within the time required by such Rule; to file promptly all other material required to be filed by the Company with the Commission pursuant to Rule 433(d) under the Act; to file promptly all reports and any definitive proxy or information statements required to be filed by the Company with the Commission pursuant to Section 13(a), 13(c), 14 or 15(d) of the Exchange Act subsequent to the date of the Prospectus and for so long as the delivery of a prospectus (or in lieu thereof, the notice referred to in Rule 173(a) under the Act) is required in connection with the offering or sale of the Warrants; to advise the Representatives, promptly after it receives notice thereof, of the issuance by the Commission of any stop order or of any order preventing or suspending the use of any Preliminary Prospectus or other prospectus in respect of the Warrants, of any notice of objection of the Commission to the use of the Registration Statement or any post-effective amendment thereto pursuant to Rule 401(g)(2) under the Act, of the suspension of the qualification of the Warrants for offering or sale in any jurisdiction, of the initiation or threatening of any proceeding for any such purpose, or of any request by the Commission for the amending or supplementing of the Registration Statement or the Prospectus or for additional information; and, in the event of the issuance of any stop order or of any order preventing or suspending the use of any Preliminary Prospectus or other prospectus in respect of the Warrants or suspending any such qualification, to promptly use its reasonable best efforts to obtain the withdrawal of such order; and in the event of any such issuance of a notice of objection, promptly to take such reasonable steps including, without limitation, amending the Registration Statement or filing a new registration statement, at its own expense, as may be necessary to permit offers and sales of the Warrants by the Underwriters (references herein to the Registration Statement shall include any such amendment or new registration statement).

(b) Rule 430B(h). If required by Rule 430B(h) under the Act, to prepare a form of prospectus in a form approved by the Representatives and to file such form of prospectus pursuant to Rule 424(b) under the Act not later than may be required by Rule 424(b) under the Act; and to make no further amendment or supplement to such form of prospectus which shall be disapproved by the Representatives promptly after reasonable notice therereof.

(c) Qualification of Securities. Promptly from time to time to take such action as the Representatives may reasonably request to qualify the Warrants and the Warrant Shares for offering and sale under the securities laws of such jurisdictions as the Representatives may request and to comply with such laws so as to permit the continuance of sales and dealings therein in such jurisdictions for as long as may be necessary to complete the distribution of the Warrants and the Warrant Shares; provided that in connection therewith, the Company shall not be required to qualify as a foreign corporation or to file a general consent to service of process in any jurisdiction.

(d) Deliver of Copies; Ongoing Compliance. Prior to 10:00 a.m., New York City time, on the New York Business Day next succeeding the date of this Underwriting Agreement and from time to time, to furnish the Underwriters with written and electronic copies of the Prospectus in New York City in such quantities and at such locations as the Representatives may reasonably request, and, if the delivery of a prospectus (or in lieu thereof, the notice referred to in Rule 173(a) under the Act) is required at any time prior to the expiration of nine months after the time of issue of the Prospectus in connection with the offering or sale of the Warrants and if at such time any event shall have occurred as a result of which the Prospectus as then amended or supplemented would include an untrue statement of a material fact or omit to state any material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made when such Prospectus (or in lieu thereof, the notice referred to in Rule 173(a) under the Act) is delivered, not misleading, or, if for any other reason it shall be necessary during such same period to amend or supplement the Prospectus or to file under the Exchange Act any document incorporated by reference in the Prospectus in order to comply with the Act or the Exchange Act, to notify the Representatives and upon their request to file such document and to prepare

and furnish without charge to each Underwriter and to any dealer in securities as many written and electronic copies as they may from time to time reasonably request of an amended Prospectus or a supplement to the Prospectus which will correct such statement or omission or effect such compliance; and in case any Underwriter is required to deliver a prospectus (or in lieu thereof, the notice referred to in Rule 173(a) under the Act) in connection with sales of any of the Warrants at any time nine months or more after the time of issue of the Prospectus, upon the request of such Underwriter but at the expense of such Underwriter, to prepare and deliver to such Underwriter as many written and electronic copies as such Underwriter may request of an amended or supplemented Prospectus complying with Section 10(a)(3) of the Act.

(e) Earnings Statement. To make generally available to its securityholders as soon as practicable, but in any event not later than sixteen months after the effective date of the Registration Statement (as defined in Rule 158(c) under the Act), an earnings statement of the Company and its subsidiaries (which need not be audited) complying with Section 11(a) of the Act and the rules and regulations of the Commission thereunder (including, at the option of the Company, Rule 158).

(f) Exchange Listing. Approval for listing of the Warrants for trading on the NASDAQ Global Select Market (“NASDAQ”) shall have been obtained, subject to official notice of issuance.

(g) Filing Fees. To pay the required Commission filing fees relating to the Warrants within the time required by Rule 456(b)(1) under the Act without regard to the proviso therein and otherwise in accordance with Rules 456(b) and 457(r) under the Act.

(h) Use of Proceeds. To use the net proceeds received by it from the sale of the Warrants pursuant to this Underwriting Agreement in the manner specified in the Pricing Prospectus under the caption “Use of Proceeds.”

(i) NASDAQ. In connection with the offering and sale of the Warrants, to file with the NASDAQ Stock Market, Inc. all documents and notices, and make all certifications, required by the NASDAQ Stock Market, Inc. of companies that have securities that are listed on the NASDAQ.

(j) Company Actions. To not take, directly or indirectly, any action designed to cause or result in, or that has constituted or might reasonably be expected to constitute, under the Exchange Act or otherwise, the stabilization or manipulation of the price of any securities of the Company to facilitate the sale or resale of the Warrants.

(k) Warrant Shares. The Company will use reasonable best efforts to effect and maintain, subject to notice of issuance, the listing of the Warrant Shares issuable upon the exercise of the Warrants on the NASDAQ or on any other stock exchange on which the Warrant Shares may be listed.

(l) Common Stock. The Company will reserve and keep available at all times, free of preemptive or other similar rights, a sufficient number of shares of Common Stock for the purpose of enabling the Company to satisfy any obligations to issue such shares upon exercise of the Warrants.

(m) Company Lockup. The Company will not, without the prior consent of the Representatives, (i) offer, pledge, announce the intention to sell, sell, contract to sell, sell any option or contract to purchase, purchase any option or contract to sell, grant any option, right or warrant for the sale of, lend or otherwise transfer or dispose of, for a period of 90 days after the date hereof, except as provided hereunder, any warrants, or securities convertible into or exchangeable for any warrants or any such other substantially similar securities of the Company and (ii) for a period of 30 days after the date hereof, offer, pledge, sell, contract to sell, sell any option or contract to purchase or otherwise dispose of, except as

provided hereunder, any Common Stock or securities convertible into or exchangeable for Common Stock or any such other substantially similar securities of the Company, collectively, for gross proceeds exceeding the amount that is equal to (x) $600,000,000, minus the aggregate offering amount of Warrants purchased pursuant to this Underwriting Agreement, multiplied by (y)1.2; provided, however, that for the purposes of calculating the collective gross proceeds of the actions described in clause (ii) above, (1) options granted by the Company as executive compensation and (2) Common Stock issued pursuant to the Company’s Amended and Restated Dividend Reinvestment and Common Stock Purchase Plan established on March 31, 2009, shall not be included in such calculation.

(n) Lockup Agreements. The Company has caused each executive officer and director, as applicable, of the Company identified on Schedule III to furnish to you a letter or letters, dated the date hereof, substantially in the form attached hereto as Exhibit I (the “Lockup Agreement”).

(o) Agents. The Company will maintain a transfer agent, a warrant agent and, if necessary under the jurisdiction of incorporation of the Company, a registrar for the Warrants and for the Common Stock.

Section 6. Free Writing Prospectus.

(a) (i) The Company represents and agrees that, other than the final term sheet prepared and filed pursuant to Section 5(a) hereof, without the prior consent of the Representatives, it has not made and will not make any offer relating to the Warrants that would constitute a “free writing prospectus” as defined in Rule 405 under the Act; (ii) each Underwriter represents and agrees that, without the prior consent of the Company and the Representatives, it has not made and will not make any offer relating to the Warrants that would constitute a free writing prospectus required to be filed with the Commission; and (iii) any such free writing prospectus the use of which has been consented to by the Company and the Representatives (including the final term sheet prepared and filed pursuant to Section 5(a) hereof) is listed on Schedule II(a) hereto.

(b) The Company has complied and will comply with the requirements of Rule 433 under the Act applicable to any Issuer Free Writing Prospectus, including timely filing with the Commission or retention where required and legending.

(c) The Company agrees that if at any time following issuance of an Issuer Free Writing Prospectus any event occurred or occurs as a result of which such Issuer Free Writing Prospectus would conflict with the information in the Registration Statement, the Pricing Prospectus or the Prospectus or would include an untrue statement of a material fact or omit to state any material fact necessary in order to make the statements therein, in the light of the circumstances then prevailing, not misleading, the Company will give prompt notice thereof to the Underwriters and, if requested by the Representatives, will prepare and furnish without charge to each Underwriter an Issuer Free Writing Prospectus or other document which will correct such conflict, statement or omission; provided, however, that this representation and warranty shall not apply to any statements or omissions in an Issuer Free Writing Prospectus made in reliance upon and in conformity with information furnished in writing to the Company by an Underwriter expressly for use therein.

Section 7. Payment of Expenses. The Company covenants and agrees with the several Underwriters that the Company will pay or cause to be paid the following: (i) the fees, disbursements and expenses of the Company’s counsel and accountants in connection with the registration of the Warrants under the Act and all other expenses in connection with the preparation, printing and filing of the Registration Statement, the Basic Prospectus, any Preliminary Prospectus, any Issuer Free Writing Prospectus and the Prospectus and amendments and supplements thereto and the mailing and delivering of copies thereof to the Underwriters and dealers; (ii) the cost of printing or producing this Underwriting Agreement, the Blue

Sky and Legal Investment Memoranda, closing documents (including any compilations thereof) and any other documents in connection with the offering, purchase, sale and delivery of the Warrants; (iii) all expenses in connection with the qualification of the Warrants and Warrant Shares for offering and sale under state securities laws as provided in Section 5(d) hereof, including the fees and disbursements of counsel for the Underwriters in connection with such qualification and in connection with the Blue Sky and Legal Investment Surveys; (iv) any filing fees incident to, and the fees and disbursements of counsel for the Underwriters in connection with, any required review by FINRA of the terms of the sale of the Warrants; (v) all fees and expenses in connection with listing the Warrants on the Exchange; (vi) the cost of preparing the Warrants; (vii) the costs and charges of any transfer agent, warrant agent or registrar or any dividend distribution agent; and (viii) all other costs and expenses incident to the performance of its obligations hereunder which are not otherwise specifically provided for in this Section. It is understood, however, that, except as provided in this Section, and Sections 9 and 12 hereof, the Underwriters will pay all of their own costs and expenses, including the fees of their counsel, transfer taxes on resale of any of the Warrants by them, and any advertising expenses connected with any offers they may make.

Section 8. Conditions of Obligations of the Underwriters. The obligations of the Underwriters hereunder shall be subject, in their discretion, to the condition that all representations and warranties and other statements of the Company herein are, at and as of each Time of Delivery, true and correct and the Company shall have performed all of its obligations hereunder theretofore to be performed and the following additional conditions:

(a) Registration Compliance; No Stop Order. The Prospectus shall have been filed with the Commission pursuant to Rule 424(b) under the Act within the applicable time period prescribed for such filing by the rules and regulations under the Act and in accordance with Section 5(a) hereof; the final term sheet contemplated by Section 5(a) hereof, and any other material required to be filed by the Company pursuant to Rule 433(d) under the Act, shall have been filed with the Commission within the applicable time periods prescribed for such filings by Rule 433; no stop order suspending the effectiveness of the Registration Statement or any part thereof shall have been issued and no proceeding for that purpose shall have been initiated or threatened by the Commission and no notice of objection of the Commission to the use of the Registration Statement or any post-effective amendment thereto pursuant to Rule 401(g)(2) under the Act shall have been received; no stop order suspending or preventing the use of the form of the Prospectus or any Issuer Free Writing Prospectus shall have been initiated or threatened by the Commission; and all requests for additional information on the part of the Commission shall have been complied with to the reasonable satisfaction of the Representatives.

(b) Opinions and Negative Assurance Letters of Counsel to the Underwriters. ▇▇▇▇▇▇ ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ & ▇▇▇▇▇▇▇▇ LLP, counsel for the Underwriters, shall have furnished to the Representatives such written opinion or opinions, dated each Time of Delivery, in form and substance reasonably satisfactory to the Representatives, with respect to such matters as the Representatives may reasonably request, and such counsel shall have received such papers and information as they may reasonably request to enable them to pass upon such matters.

(c) Opinions and Negative Assurance Letters of Counsels to the Company. ▇▇▇▇▇▇▇▇ & ▇▇▇▇▇▇▇▇ LLP, counsel to the Company, and ▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇▇▇ & ▇▇▇▇▇▇▇▇▇▇, a Professional Corporation, Utah counsel to the Company shall each have furnished to the Representatives their written opinions, each dated each Time of Delivery, substantially in the form of Annex II(a), Annex II(b), Annex II(c) and Annex II(d) hereto, as applicable.

(d) Comfort Letters. On the date of the Prospectus at a time prior to the execution of this Underwriting Agreement, at 9:30 a.m., New York City time, on the effective date of any post-effective amendment to the Registration Statement filed subsequent to the date of this Underwriting Agreement and

also at each Time of Delivery, Ernst & Young LLP shall have furnished to the Underwriters a letter or letters, dated the respective dates of delivery thereof, in form and substance reasonably satisfactory to the Representatives and their counsel, containing statements and information of the type ordinarily included in accountants’ “comfort letters” to underwriters with respect to the financial statements of the Company and its subsidiaries included or incorporated by reference in the Registration Statement.

(e) No Material Adverse Change. Neither the Company nor any of its subsidiaries shall have sustained since the date of the latest audited financial statements included or incorporated by reference in the Pricing Prospectus any loss or interference with its business from fire, explosion, flood or other calamity, whether or not covered by insurance, or from any labor dispute or court or governmental action, order or decree, otherwise than as set forth or contemplated in the Pricing Prospectus, and (ii) since the respective dates as of which information is given in the Pricing Prospectus there shall not have been any change in the capital stock or long term debt of the Company or any of its subsidiaries or any change, or any development involving a prospective change, in or affecting the general affairs, management, financial position, stockholders’ equity or results of operations of the Company and its subsidiaries, otherwise than as set forth or contemplated in the Pricing Prospectus, the effect of which, in any such case described in clause (i) or (ii), is in the judgment of the Representatives so material and adverse as to make it impracticable or inadvisable to proceed with the public offering or the delivery of the Warrants on the terms and in the manner contemplated in the Prospectus.

(f) Listing. The Warrants have been approved for listing on the NASDAQ, subject to official notice of issuance.

(g) Lockup Agreements. The Representatives shall have received executed copies of the Lockup Agreements that are in full force and effect.

(h) No Ratings Downgrade. On or after the Applicable Time (i) no downgrading shall have occurred in the rating accorded the Company’s debt securities by any “nationally recognized statistical rating organization,” as that term is defined by the Commission for purposes of Rule 436(g)(2) under the Act, and (ii) no such organization shall have publicly announced that it has under surveillance or review, with possible negative implications, its rating of any of the Company’s debt securities.

(i) No Market Disruption. On or after the Applicable Time there shall not have occurred any of the following: (i) a suspension or material limitation in trading in securities generally on the NYSE or the NASDAQ ; (ii) a suspension or material limitation in trading in the Company’s securities on the NYSE or NASDAQ; (iii) a general moratorium on commercial banking activities declared by either Federal or New York, California, Utah, Nevada, Colorado, Washington, Idaho, Arizona or Texas State authorities or a material disruption in commercial banking or securities settlement or clearance services in the United States; (iv) the outbreak or escalation of hostilities involving the United States or the declaration by the United States of a national emergency or war or (v) the occurrence of any other calamity or crisis or any change in financial, political or economic conditions in the United States or elsewhere, if the effect of any such event specified in clause (iv) or (v) in the judgment of the Representatives makes it impracticable or inadvisable to proceed with the public offering or the delivery of the Warrants on the terms and in the manner contemplated in the Prospectus.

(j) Prospectus Delivery. The Company shall have complied with the provisions of Section 5(d) hereof with respect to the timely furnishing of prospectuses.

(k) Officer’s Certificates. The Company shall have furnished or caused to be furnished to the Underwriters at each Time of Delivery certificates of officers of the Company satisfactory to the Representatives as to the accuracy of the representations and warranties of the Company herein at and as

of such time, as to the performance by the Company of all of its obligations hereunder to be performed at or prior to such time, as to the matters set forth in subsections (a) and (e) of this Section 8 and as to such other matters as the Representatives may reasonably request.

Section 9. Indemnification and Contribution.

(a) Indemnification of the Underwriters. The Company will indemnify and hold harmless each Underwriter against any losses, claims, damages or liabilities, joint or several, to which such Underwriter may become subject, under the Act or otherwise, insofar as such losses, claims, damages or liabilities (or actions in respect thereof) arise out of or are based upon an untrue statement or alleged untrue statement of a material fact contained in the Registration Statement, the Basic Prospectus, any Preliminary Prospectus, the Pricing Prospectus or the Prospectus, or any amendment or supplement thereto, any Issuer Free Writing Prospectus or any “issuer information” filed or required to be filed pursuant to Rule 433(d) under the Act, or arise out of or are based upon the omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein not misleading, and will reimburse each Underwriter for any legal or other expenses reasonably incurred by such Underwriter in connection with investigating or defending any such action or claim as such expenses are incurred; provided, however, that the Company shall not be liable in any such case to the extent that any such loss, claim, damage or liability arises out of or is based upon an untrue statement or alleged untrue statement or omission or alleged omission made in the Registration Statement, the Basic Prospectus, any Preliminary Prospectus, the Pricing Prospectus or the Prospectus, or any amendment or supplement thereto, or any Issuer Free Writing Prospectus, in reliance upon and in conformity with written information furnished to the Company by any Underwriter expressly for use therein.

(b) Indemnification of the Company. Each Underwriter will indemnify and hold harmless the Company against any losses, claims, damages or liabilities to which the Company may become subject, under the Act or otherwise, insofar as such losses, claims, damages or liabilities (or actions in respect thereof) arise out of or are based upon an untrue statement or alleged untrue statement of a material fact contained in the Registration Statement, the Basic Prospectus, any Preliminary Prospectus, the Pricing Prospectus or the Prospectus, or any amendment or supplement thereto, or any Issuer Free Writing Prospectus, or arise out of or are based upon the omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein not misleading, in each case to the extent, but only to the extent, that such untrue statement or alleged untrue statement or omission or alleged omission was made in the Registration Statement, the Basic Prospectus, any Preliminary Prospectus, the Pricing Prospectus or the Prospectus, or any such amendment or supplement thereto, or any Issuer Free Writing Prospectus, in reliance upon and in conformity with written information furnished to the Company by such Underwriter expressly for use therein; and will reimburse the Company for any legal or other expenses reasonably incurred by the Company in connection with investigating or defending any such action or claim as such expenses are incurred.

(c) Notice and Procedures. Promptly after receipt by an indemnified party under subsection (a) or (b) above of notice of the commencement of any action, such indemnified party shall, if a claim in respect thereof is to be made against the indemnifying party under such subsection, notify the indemnifying party in writing of the commencement thereof; but the omission so to notify the indemnifying party shall not relieve it from any liability which it may have to any indemnified party otherwise than under such subsection except and then only to the extent such indemnifying party is materially prejudiced thereby. In case any such action shall be brought against any indemnified party and it shall notify the indemnifying party of the commencement thereof, the indemnifying party shall be entitled to participate therein and, to the extent that it shall wish, jointly with any other indemnifying party similarly notified, to assume the defense thereof, with counsel satisfactory to such indemnified party (who shall not, except with the consent of the indemnified party, be counsel to the indemnifying party),

and, after notice from the indemnifying party to such indemnified party of its election so to assume the defense thereof, the indemnifying party shall not be liable to such indemnified party under such subsection for any legal expenses of other counsel or any other expenses, in each case subsequently incurred by such indemnified party, in connection with the defense thereof other than reasonable costs of investigation. No indemnifying party shall, without the written consent of the indemnified party, effect the settlement or compromise of, or consent to the entry of any judgment with respect to, any pending or threatened action or claim in respect of which indemnification or contribution may be sought hereunder (whether or not the indemnified party is an actual or potential party to such action or claim) unless such settlement, compromise or judgment (i) includes an unconditional release of the indemnified party from all liability arising out of such action or claim and (ii) does not include a statement as to or an admission of fault, culpability or a failure to act, by or on behalf of any indemnified party.

(d) Contribution. If the indemnification provided for in this Section 9 is unavailable to or insufficient to hold harmless an indemnified party under subsection (a) or (b) above in respect of any losses, claims, damages or liabilities (or actions in respect thereof) referred to therein, then each indemnifying party shall contribute to the amount paid or payable by such indemnified party as a result of such losses, claims, damages or liabilities (or actions in respect thereof) in such proportion as is appropriate to reflect the relative benefits received by the Company on the one hand and the Underwriters on the other from the offering of the Warrants to which such loss, claim, damage or liability (or action in respect thereof) relates. If, however, the allocation provided by the immediately preceding sentence is not permitted by applicable law or if the indemnified party failed to give the notice required under subsection (c) above, then each indemnifying party shall contribute to such amount paid or payable by such indemnified party in such proportion as is appropriate to reflect not only such relative benefits but also the relative fault of the Company on the one hand and the Underwriters on the other in connection with the statements or omissions which resulted in such losses, claims, damages or liabilities (or actions in respect thereof), as well as any other relevant equitable considerations. The relative benefits received by the Company on the one hand and the Underwriters on the other shall be deemed to be in the same proportion as the total net proceeds from the offering (before deducting expenses) received by the Company bear to the total underwriting discounts and commissions received by the Underwriters, in each case as set forth in the table on the cover page of the Prospectus. The relative fault shall be determined by reference to, among other things, whether the untrue or alleged untrue statement of a material fact or the omission or alleged omission to state a material fact relates to information supplied by the Company on the one hand or the Underwriters on the other and the parties’ relative intent, knowledge, access to information and opportunity to correct or prevent such statement or omission. The Company and the Underwriters agree that it would not be just and equitable if contribution pursuant to this subsection (d) were determined by pro rata allocation (even if the Underwriters were treated as one entity for such purpose) or by any other method of allocation which does not take account of the equitable considerations referred to above in this subsection (d). The amount paid or payable by an indemnified party as a result of the losses, claims, damages or liabilities (or actions in respect thereof) referred to above in this subsection (d) shall be deemed to include any legal or other expenses reasonably incurred by such indemnified party in connection with investigating or defending any such action or claim. Notwithstanding the provisions of this subsection (d), no Underwriter shall be required to contribute any amount in excess of the amount by which the total price at which the Warrants underwritten by it and distributed to the public were offered to the public exceeds the amount of any damages which such Underwriter has otherwise been required to pay by reason of such untrue or alleged untrue statement or omission or alleged omission. No person guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the Act) shall be entitled to contribution from any person who was not guilty of such fraudulent misrepresentation. The Underwriters’ obligations in this subsection (d) to contribute are several in proportion to their respective underwriting obligations and not joint.

(e) Limitation on Liability. The obligations of the Company under this Section 9 shall be in addition to any liability which the Company may otherwise have and shall extend, upon the same terms and conditions, to each person, if any, who controls any Underwriter within the meaning of the Act and the Exchange Act, each broker-dealer affiliate of any Underwriter and each officer and director of such affiliate; and the obligations of the Underwriters under this Section 9 shall be in addition to any liability which the respective Underwriters may otherwise have and shall extend, upon the same terms and conditions, to each officer and director of the Company and to each person, if any, who controls the Company within the meaning of the Act.

Section 10. Default by Underwriter.

(a) If any Underwriter shall default in its obligation to purchase the Warrants which it has agreed to purchase hereunder, the Representatives may in their discretion arrange for the Underwriters or another party or other parties to purchase such Warrants on the terms contained herein. If within thirty-six hours after such default by any Underwriter, the Representatives do not arrange for the purchase of such Warrants, then the Company shall be entitled to a further period of thirty-six hours within which to procure another party or other parties satisfactory to the Representatives to purchase such Warrants on such terms. In the event that, within the respective prescribed periods, the Representatives notify the Company that the Representatives have so arranged for the purchase of such Warrants, or the Company notifies the Representatives that it has so arranged for the purchase of such Warrants, the Representatives or the Company shall have the right to postpone each Time of Delivery for a period of not more than seven days, in order to effect whatever changes may thereby be made necessary in the Registration Statement or the Prospectus, or in any other documents or arrangements, and the Company agrees to file promptly any amendments or supplements to the Registration Statement or the Prospectus which in opinion of the Company and the Representatives may thereby be made necessary. The term “Underwriter” as used in this Underwriting Agreement shall include any person substituted under this Section 10 with like effect as if such person had originally been a party to this Underwriting Agreement with respect to such Warrants.

(b) If, after giving effect to any arrangements for the purchase of the Warrants of a defaulting Underwriter or Underwriters by the Representatives and the Company as provided in subsection (a) above, the aggregate number of such Warrants which remains unpurchased does not exceed one eleventh of the aggregate number of all the Warrants, then the Company shall have the right to require each non-defaulting Underwriter to purchase the number of Warrants which such Underwriter agreed to purchase hereunder and, in addition, to require each non-defaulting Underwriter to purchase its pro rata share (based on the number of Warrants which such Underwriter agreed to purchase hereunder) of the Warrants of such defaulting Underwriter or Underwriters for which such arrangements have not been made; but nothing herein shall relieve a defaulting Underwriter from liability for its default.

(c) If, after giving effect to any arrangements for the purchase of the Warrants of a defaulting Underwriter or Underwriters by the Representatives and the Company as provided in subsection (a) above, the aggregate number of Warrants which remains unpurchased exceeds one eleventh of the aggregate number of all the Warrants, or if the Company shall not exercise the right described in subsection (b) above to require non-defaulting Underwriters to purchase Warrants of a defaulting Underwriter or Underwriters, then this Underwriting Agreement shall thereupon terminate, without liability on the part of any non-defaulting Underwriter or the Company, except for the expenses to be borne by the Company and the Underwriters as provided in Section 7 hereof and the indemnity and contribution agreements in Section 9 hereof; but nothing herein shall relieve a defaulting Underwriter from liability for its default.

Section 11. Representations, Warranties and Agreements to Survive Delivery. The respective indemnities, agreements, representations, warranties and other statements of the Company and the several Underwriters, as set forth in this Underwriting Agreement or made by or on behalf of them, respectively, pursuant to this Underwriting Agreement, shall remain in full force and effect, regardless of any investigation (or any statement as to the results thereof) made by or on behalf of any Underwriter or any controlling person of any Underwriter, or the Company, or any officer or director or controlling person of the Company, and shall survive delivery of and payment for the Warrants.

Section 12. Termination. If this Underwriting Agreement shall be terminated pursuant to Section 10 hereof, the Company shall not be under any liability to any Underwriter except as provided in Sections 7 and 9 hereof; but, if for any other reason, the Warrants are not delivered by or on behalf of the Company as provided herein, the Company will reimburse the Underwriters through the Representatives for all out of pocket expenses approved in writing by the Representatives, including fees and disbursements of counsel, reasonably incurred by the Underwriters in making preparations for the purchase, sale and delivery of the Warrants, but the Company shall then be under no further liability to any Underwriter except as provided in Sections 7 and 9 hereof.

Section 13. Representatives. In all dealings hereunder, the Representatives shall act on behalf of each of the Underwriters, and the parties hereto shall be entitled to act and rely upon any statement, request, notice or agreement on behalf of any Underwriter made or given by the Representatives.

Section 14. Notices. All statements, requests, notices and agreements hereunder shall be in writing, and if to the Representatives shall be delivered or sent by mail, telex or facsimile transmission to:

▇▇▇▇▇▇▇, ▇▇▇▇▇ & Co.

▇▇▇ ▇▇▇▇ ▇▇▇▇▇▇

▇▇▇ ▇▇▇▇, ▇▇▇ ▇▇▇▇ ▇▇▇▇▇

Attention: Registration Department

Facsimile: ▇▇▇-▇▇▇-▇▇▇▇

Deutsche Bank Securities Inc.

▇▇ ▇▇▇▇ ▇▇▇▇▇▇, ▇^▇▇ ▇▇▇▇▇

▇▇▇ ▇▇▇▇, ▇▇▇ ▇▇▇▇ ▇▇▇▇▇

Attention: ECM Syndicate Desk

Facsimile: ▇▇▇-▇▇▇-▇▇▇▇

With a copy sent to:

Deutsche Bank Securities Inc.

▇▇ ▇▇▇▇ ▇▇▇▇▇▇, ▇^▇▇ ▇▇▇▇▇

▇▇▇ ▇▇▇▇, ▇▇▇ ▇▇▇▇ ▇▇▇▇▇

Attention: General Counsel

Facsimile: 212-797-4564

and if to the Company shall be delivered or sent by mail, telex or facsimile transmission to the address of the Company set forth in the Registration Statement, Attention: Secretary; provided, however, that any notice to an Underwriter pursuant to Section 9(c) hereof shall be delivered or sent by mail, telex or facsimile transmission to such Underwriter at its address set forth in its Underwriters Questionnaire, or telex constituting such Questionnaire, which address will be supplied to the Company by the Representatives upon request. Any such statements, requests, notices or agreements shall take effect upon receipt thereof.

In accordance with the requirements of the USA Patriot Act (Title III of Pub. L. 107-56 (signed into law October 26, 2001)), the underwriters are required to obtain, verify and record information that identifies their respective clients, including the Company, which information may include the name and address of their respective clients, as well as other information that will allow the underwriters to properly identify their respective clients.

Section 15. Parties. This Underwriting Agreement shall be binding upon, and inure solely to the benefit of, the Underwriters and the Company and, to the extent provided in Sections 9 and 11 hereof, the officers and directors of the Company and each person who controls the Company or any Underwriter, and their respective heirs, executors, administrators, successors and assigns, and no other person shall acquire or have any right under or by virtue of this Underwriting Agreement. No purchaser of any of the Warrants from any Underwriter shall be deemed a successor or assign by reason merely of such purchase.

Section 16. Time of the Essence. Time shall be of the essence of this Underwriting Agreement. As used herein, the term “business day” shall mean any day when the Commission’s office in Washington, D.C. is open for business.

Section 17. No Advisory or Fiduciary Relationship. The Company acknowledges and agrees that (i) the purchase and sale of the Warrants pursuant to this Underwriting Agreement is an arm’s-length commercial transaction between the Company, on the one hand, and the several Underwriters, on the other, (ii) in connection therewith and with the process leading to such transaction each Underwriter is acting solely as a principal and not the agent or fiduciary of the Company, (iii) no Underwriter has assumed an advisory or fiduciary responsibility in favor of the Company with respect to the offering contemplated hereby or the process leading thereto (irrespective of whether such Underwriter has advised or is currently advising the Company on other matters) or any other obligation to the Company except the obligations expressly set forth in this Underwriting Agreement and (iv) the Company has consulted its own legal and financial advisors to the extent it deemed appropriate. The Company agrees that it will not claim that the Underwriters, or any of them, has rendered advisory services of any nature or respect, or owes a fiduciary or similar duty to the Company, in connection with such transaction or the process leading thereto.

Section 18. Prior Agreements. This Underwriting Agreement supersedes all prior agreements and understandings (whether written or oral) between the Company and the Underwriters, or any of them, with respect to the subject matter hereof.

Section 19. Governing Law. THIS UNDERWRITING AGREEMENT AND ANY MATTERS RELATED TO THIS TRANSACTION SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK WITHOUT REGARD TO PRINCIPLES OF CONFLICT OF LAWS THAT WOULD RESULT IN THE APPLICATION OF ANY LAW OTHER THAN THE LAWS OF THE STATE OF NEW YORK.

Section 20. Counterparts. This Underwriting Agreement may be executed by any one or more of the parties hereto and thereto in any number of counterparts, each of which shall be deemed to be an original, but all such respective counterparts shall together constitute one and the same instrument. This Underwriting Agreement may be delivered by any party by facsimile or other electronic transmission.

Section 21. Severability. The invalidity or unenforceability of any section, paragraph or provision of this Underwriting Agreement shall not affect the validity or enforceability of any other section, paragraph or provision hereof. If any section, paragraph or provision of this Underwriting Agreement is for any reason determined to be invalid or unenforceable, there shall be deemed to be made such minor changes (and only such minor changes) as are necessary to make it valid and enforceable.

Section 22. Disclosure of Tax Matters. Notwithstanding anything herein to the contrary, the Company is authorized to disclose to any persons the U.S. federal and state income tax treatment and tax structure of the potential transaction and all materials of any kind (including tax opinions and other tax analyses) provided to the Company relating to that treatment and structure, without the Underwriters imposing any limitation of any kind. However, any information relating to the tax treatment and tax structure shall remain confidential (and the foregoing sentence shall not apply) to the extent necessary to enable any person to comply with securities laws. For this purpose, “tax structure” is limited to any facts that may be relevant to that treatment.

If the foregoing is in accordance with your understanding of our agreement, please sign and return to the Company a counterpart hereof, whereupon this instrument, along with all counterparts, will become a binding agreement between each of the Underwriters and the Company in accordance with its terms.

Very truly yours,

ZIONS BANCORPORATION



By:		/s/ ▇▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇
		Name: ▇▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇
		Title: Chief Executive Officer

The foregoing Underwriting Agreement

is hereby confirmed and accepted as

of the date first above written.

▇▇▇▇▇▇▇, SACHS & CO.

DEUTSCHE BANK SECURITIES INC.

As Representatives of the several Underwriters

listed on Schedule I

▇▇▇▇▇▇▇, ▇▇▇▇▇ & CO.

/s/ ▇▇▇▇▇▇▇, Sachs & Co.

(▇▇▇▇▇▇▇, ▇▇▇▇▇ & Co.)


DEUTSCHE BANK SECURITIES INC.

By:		/s/ ▇▇▇▇▇▇ Badinehel
		Name: ▇▇▇▇▇▇ Badinehel
		Title: Managing Director



By:		/s/ ▇▇▇▇▇ ▇▇▇▇▇▇
		Name: ▇▇▇▇▇ ▇▇▇▇▇▇
		Title: Director

ZIONS BANCORPORATION 21,077,227 Warrants UNDERWRITING AGREEMENT

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