4,000,000 Shares SOUTHWEST BANCORP, INC. Common Stock UNDERWRITING AGREEMENT

Exhibit 1.1

4,000,000 Shares

SOUTHWEST BANCORP, INC.

Common Stock

April 26, 2010

XXXXXX, XXXXXXXX & COMPANY, INCORPORATED
XXXXXXXX INC.
as representatives of the several Underwriters
named in Schedule I hereto
x/x Xxxxxx, Xxxxxxxx & Company, Incorporated
000 Xxxxx Xxxxxxxx
Xx. Xxxxx, Xxxxxxxx 00000

Ladies and Gentlemen:

Southwest Bancorp, Inc., an Oklahoma corporation (the “Company”), proposes to issue and sell to the several underwriters named in Schedule I hereto (the “Underwriters”) for whom you are acting as representatives (the “Representatives”) an aggregate of 4,000,000 shares (the “Firm Shares”) of the common stock, par value $1.00 per share, of the Company (“Common Stock”). The Company also proposes to sell to the several Underwriters, for the sole purpose of covering over-allotments in connection with the sale of the Firm Shares, at the option of the Underwriters, up to an additional 600,000 shares of Common Stock (the “Option Shares”). The Firm Shares and the Option Shares are hereinafter referred to collectively as the “Shares.”

The Company confirms as follows its agreements with the Representatives and the several other Underwriters.

1. (a) The Company represents and warrants to, and agrees with, each of the Underwriters that, as of the date hereof and as of the Closing Date (as defined herein) and each Option Closing Date (as defined herein), if any:

(i) The Company meets the requirements for the use of Form S-3 under the Securities Act of 1933, as amended (the “Securities Act”) and has prepared and filed with the Securities and Exchange Commission (the “Commission”) a registration statement on Form S-3 (File No. 333-165451) in respect of the Shares (the “Initial Registration Statement”) pursuant to the Securities Act; the Initial Registration Statement and any post-effective amendment thereto, each in the form heretofore delivered to you, became effective in such form; no other registration statement or amendment thereto has heretofore been filed with the Commission with respect to the Shares; no stop order suspending the effectiveness of the Initial Registration Statement or any post-effective amendment thereto has been issued, no proceeding for that purpose has been initiated or threatened by the Commission, any request on the part of the Commission for additional information from the Company has been satisfied in all material respects, and no notice of objection of the Commission to the use of the Initial Registration Statement or any post-effective amendment thereto pursuant to Rule 401(g) under the Securities Act has been received by the Company; the prospectus filed as part of the Initial Registration Statement, in the form in which it was included in such registration statement on the effective date of the Registration Statement, is hereinafter called the “Base Prospectus”; any preliminary prospectus (including any preliminary prospectus supplement) relating to the Shares filed with the Commission pursuant to Rule 424(b) under the Securities

Act after the Base Prospectus is hereinafter called a “Preliminary Prospectus”; the various parts of the Initial Registration Statement, including all exhibits thereto, and including any prospectus supplement relating to the Shares filed with the Commission and deemed by virtue of Rule 430B to be part of the Initial Registration Statement, each as amended at the time such part of the Initial Registration Statement became effective, are hereinafter collectively called the “Registration Statement”; the Base Prospectus, as amended and supplemented (including, without limitation, by a Preliminary Prospectus) immediately prior to the Applicable Time (as defined herein), is hereinafter called the “Pricing Prospectus”; the form of the final prospectus relating to the Shares filed with the Commission pursuant to Rule 424(b) under the Securities Act in accordance with Section 5(a) is hereinafter called the “Prospectus”; any reference herein to the Base 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 Securities Act, as of the date of such prospectus; any reference to any amendment or supplement to the Base 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 Shares filed with the Commission pursuant to Rule 424(b) under the Securities 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 Base 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; any “issuer free writing prospectus” as defined in Rule 433 under the Securities Act relating to the Shares is hereinafter called an “Issuer Free Writing Prospectus”); and all references to the Registration Statement, the Base Prospectus, any Preliminary Prospectus, the Pricing Prospectus, the Prospectus, any Issuer Free Writing Prospectus or any amendment or supplement to any of the foregoing shall be deemed to include any documents incorporated by reference therein and shall include any copy thereof filed with the Commission pursuant to its Electronic Data Gathering, Analysis and Retrieval system (“XXXXX”);

(ii) (1) at the respective times the respective parts of the Registration Statement and any post-effective amendments thereto became effective and at the Closing Date (and, if any Option Shares are purchased, at each Option Closing Date), the Registration Statement and any amendments and supplements thereto complied and will comply in all material respects with the requirements of the Securities Act and the rules and regulations of the Commission thereunder (the “Rules and Regulations”) and did not 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 not misleading, and (2) at the time of the filing thereof and at the Closing Date (and, if any Option Shares are purchased, at each Option Closing Date), none of the Base Prospectus, any Preliminary Prospectus, the Prospectus or any amendments or supplements thereto included or will include an untrue statement of a material fact or omitted or will omit to state a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading; provided that the representations and warranties in clauses (1) and (2) above shall not apply to statements in or omissions from the Registration Statement, the Base Prospectus, any Preliminary Prospectus or the Prospectus made in reliance upon and in strict conformity with information furnished to the Company in writing by any Underwriter through the Representatives expressly for use therein, it being understood and agreed that the only such information provided by any Underwriter is that described as such in Section 10(b); and no order preventing or suspending the use of any Preliminary Prospectus, the Pricing Prospectus or any Issuer Free Writing Prospectus has been issued by the Commission; and

(2) (A) each Preliminary Prospectus, the Pricing Prospectus, each Issuer Free Writing Prospectus and the Base Prospectus filed as part of the Initial Registration Statement as originally filed or as part of any amendment thereto, or filed pursuant to Rule 424 under the Securities

Act, complied when so filed in all material respects with the requirements of the Securities Act and the Rules and Regulations, and (B) each Preliminary Prospectus, the Pricing Prospectus, each Issuer Free Writing Prospectus and the Base Prospectus delivered to the Underwriters for use in connection with this offering was identical to the electronically transmitted copies thereof filed with the Commission pursuant to XXXXX, except to the extent permitted by Regulation S-T, (C) to the extent applicable, all disclosures contained in each Preliminary Prospectus, the Pricing Prospectus, and the Base Prospectus regarding “non-GAAP financial measures” (as such term is defined by the rules and regulations of the Commission) comply with Regulation G of the Exchange Act and Item 10 of Regulation S-K under the Securities Act, as applicable, (D) there are no statutes, regulations, documents or contracts of a character required to be described in the Registration Statement, each Preliminary Prospectus, the Pricing Prospectus or the Prospectus or to be filed as an exhibit to the Registration Statement which are not described or filed as required, (E) no forward-looking statement (within the meaning of Section 27A of the Securities Act and Section 21E of the Exchange Act) contained in the Registration Statement, each Preliminary Prospectus, the Pricing Prospectus and the Prospectus has been made or reaffirmed without a reasonable basis or has been disclosed other than in good faith, and (F) the statistical and market and industry-related data included in the Registration Statement, each Preliminary Prospectus, the Pricing Prospectus and the Prospectus are based on or derived from sources which the Company believes to be reliable and accurate or represent the Company’s good faith estimates that are made on the basis of data derived from such sources, and the Company has obtained the written consent to the use of such data from sources to the extent required;

(3) the use of Form S-3 by the Company under the Securities Act is appropriate under the Rules and Regulations, and the Company is eligible under the Securities Act to furnish information under Form S-3 by incorporating such information by reference to Company filings made pursuant the Exchange Act, and the Company was not at the time of initial filing of the Registration Statement and at the earliest time thereafter that the Company or another offering participant made a bona fide offer (within the meaning of Rule 164(h)(2) of the Securities Act) of the Common Stock, is not on the date hereof and will not be on the Closing Date or any Option Closing Date an “ineligible issuer” (as defined in Rule 405);

(4) subject to the information contained in the Company’s Form 8-K filed April 13, 2010, the documents incorporated or deemed incorporated by reference in the Registration Statement, each Preliminary Prospectus, the Pricing Prospectus and the Prospectus, at the time they were filed or will be filed with the Commission, complied or will comply in all material respects with the requirements of the Exchange Act and the rules and regulations of the Commission thereunder and, when read together with the other information in the Preliminary Prospectus and the Pricing Prospectus at the time issued and at the time it became effective (and, if any Option Shares are purchased, at the Option Closing Date), did not and will not contain an untrue statement of a material fact required to be stated therein or necessary to make the statements therein not misleading, and such incorporated documents constitute all the documents required to be incorporated under Item 12 of Form S-3;

(iii) for the purposes of this Agreement, the “Applicable Time” is 7:00 p.m. (Eastern time) on the date of this Agreement; the Pricing Prospectus as supplemented by the Issuer Free Writing Prospectuses and other documents listed in Schedule II hereto, 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 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 an Issuer Free Writing Prospectus in reliance upon and in strict conformity with information furnished in writing to the Company by an Underwriter through the Representatives expressly for use therein;

(iv) the Company has been duly incorporated and is validly existing as a corporation in good standing under the laws of the State of Oklahoma, with power and authority (corporate and other) to own, lease and operate its properties and conduct its business as described in the Registration Statement and the Pricing Prospectus and to enter into and perform its obligations under this Agreement, and 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, except where the failure so to qualify or be in good standing would not have a Material Adverse Effect (as defined herein);

(v) (1) the Company is duly registered and qualified as a bank holding company under the applicable provisions of the Bank Holding Company Act of 1956, as amended (the “BHC Act”), and each of the Company and Stillwater National Bank of Trust Company, a national bank (“Stillwater Bank”), and Bank of Kansas, a Kansas state bank (“BoK”) (Stillwater Bank and BoK, each a “Bank,” and collectively the “Banks”), is in compliance in all material respects with all applicable laws administered by and regulations of the Board of Governors of the Federal Reserve (the “FRB”), the Federal Deposit Insurance Corporation (the “FDIC”), the Office of the Comptroller of the Currency in the case of Stillwater Bank, the Office of the State Bank Commissioner of Kansas in the case of BoK, and any other federal or state bank regulatory authority (collectively, the “Bank Regulatory Authorities”) with jurisdiction over the Company or either Bank, and except as disclosed in the Registration Statement and Prospectus, neither the Company nor either Bank is a party to any written agreement or memorandum of understanding with, or a party to, any commitment letter or similar undertaking to, or is subject to any order or directive by, or is a recipient of an extraordinary supervisory letter from, or has adopted any board resolutions at the request of, any Bank Regulatory Authority which restricts the conduct of its business, or in any manner relates to its capital adequacy, its credit policies or its management;

(2) the activities of the Company and each of its direct and indirect subsidiaries (the “Subsidiaries”) are permitted under applicable federal and state banking laws and regulations, and the Company has all necessary approvals, including the approval of the Bank Regulatory Authorities to own, directly or indirectly, the capital stock of the Subsidiaries;

(3) no report or application filed by the Company or any of its Subsidiaries with any Bank Regulatory Authority as of the date it was filed, or if it was amended, the date it was amended, 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 not misleading when made or failed to comply in all material respects with the applicable requirements of the applicable Bank Regulatory Authority;

(4) the deposit accounts of each of the Banks are insured by the FDIC up to the maximum amount provided by law, and no proceedings for the modification, termination or revocation of any such insurance are pending or to the knowledge of the Company threatened;

(5) the operations of the Company and the Subsidiaries are, and have been conducted at all times, in compliance, in all material respects, with applicable financial recordkeeping and reporting requirements of the Bank Secrecy Act, the Currency and Foreign Transactions Reporting Act of 1970, as amended, the Uniting and Strengthening America by Providing Appropriate Tools Required to Intercept and Obstruct Terrorism Act of 2001, the money laundering

statutes of all applicable jurisdictions, the rules and regulations thereunder and any related or similar rules, regulations or guidelines issued, administered or enforced by any governmental agency (collectively, the “Money Laundering Laws”), 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 Subsidiary with respect to any Money Laundering Laws is pending or, to the knowledge of the Company, threatened;

(6) the Banks and the other Subsidiaries have properly administered all accounts for which they act as a fiduciary, including but not limited to accounts for which they serve as a trustee, agent, custodian, personal representative, guardian, conservator or investment advisor, in accordance with the terms of the governing documents and applicable state and federal law and regulation and common law, except where the failure to be in compliance would not have a material adverse effect on the general affairs, business, prospects, management, financial position, shareholders’ equity or results of operations of the Company and the Subsidiaries, considered as one enterprise (a “Material Adverse Effect”) ; and none of the Banks or other Subsidiaries nor any of their directors, officers or employees has committed any material breach of trust with respect to any such fiduciary account, and the accountings for each such fiduciary account are true and correct in all material respects and accurately reflect the assets of such fiduciary account in all material respects;

(7) the most recent regulatory rating given to each Bank as to compliance with the Community Reinvestment Act of 1977, as amended (the “CRA”) is “satisfactory,” and since each Bank’s last regulatory examination of CRA compliance, neither Bank has received any complaints as to CRA compliance;

(vi) each Subsidiary has been duly incorporated (or organized) and is validly existing as a corporation (or other organization) in good standing under the laws of the jurisdiction of its incorporation (or organization), with power and authority to own, lease and operate its properties and conduct its business as described in the Registration Statement, the Base Prospectus, each Preliminary Prospectus, the Pricing Prospectus and the Prospectus, and has been duly qualified as a foreign corporation (or other organization) for the transaction of business and is in good standing under the laws of each other jurisdiction in which its owns or leases properties or conducts any business so as to require such qualification, except where the failure so to qualify or be in good standing would not have a Material Adverse Effect, and all of the issued and outstanding capital stock (or other ownership interests) of each Subsidiary has been duly and validly authorized and issued, is fully paid and non-assessable and is owned by the Company, directly or through Subsidiaries, free and clear of any security interest, mortgage, pledge, lien, encumbrance, claim or equity;

(vii) (1) the Company has an authorized capitalization as set forth in the Registration Statement and the Pricing Prospectus, and all of the issued and outstanding shares of capital stock of the Company have been duly and validly authorized and issued, are fully paid and non-assessable and conform to the descriptions thereof contained in the Registration Statement and the Pricing Prospectus, and none of the issued and outstanding shares of capital stock of the Company are subject to any preemptive or similar rights;

(2) all offers and sales of the Company’s capital stock and other debt or securities prior to the date hereof were made in compliance with, or were the subject of an available exemption from, the Securities Act and all other applicable state and federal laws or regulations;

(3) the Common Stock is registered pursuant to Section 12(b) of the Exchange Act and is listed on the NASDAQ Global Select Market (“Nasdaq”), and the Company has taken no action designed to, or likely to have the effect of, terminating the registration of the Common Stock under the Exchange Act or delisting the Common Stock from Nasdaq, nor has the Company received any notification that the Commission or Nasdaq is contemplating terminating such registration or listing, and

the Company has applied to list the Shares on Nasdaq and the Shares will be so listed on or before the Closing Date (or the Option Closing Date, if applicable), and the transactions contemplated by this Agreement will not contravene the rules and regulations of Nasdaq;

(4) except as otherwise disclosed in the Registration Statement and the Pricing Prospectus, and except for laws, regulations, and regulatory policies of general application, (A) none of the Company nor any Subsidiary is prohibited or restricted, directly or indirectly, from paying dividends or from making any other distribution with respect to their respective equity, debt or hybrid securities, and (B) no Subsidiary is restricted, except by banking laws, regulations, or regulatory policies of general applicability, from repaying to the Company or any other subsidiary of the Company any amounts that may from time to time become due under any loans or advances to each Subsidiary from the Company or from transferring any property or assets to the Company or to any other Subsidiary;

(viii) the Shares have been duly and validly authorized and, when issued and delivered to and paid for by the Underwriters in accordance with the terms of this Agreement, will be duly and validly issued and fully paid and non-assessable and will conform to the descriptions thereof contained in the Registration Statement and the Pricing Prospectus, and the issuance of such Shares is not subject to any preemptive or similar rights, and the delivery of the Shares being sold by the Company against payment therefor pursuant to the terms of this Agreement will pass valid title to the Shares being sold by the Company, free and clear of any claim, encumbrance or defect in title, to the several Underwriters purchasing such shares in good faith and without notice of any lien, claim or encumbrance;

(ix) this Agreement has been duly authorized, executed and delivered by the Company and constitutes a valid and binding obligation of the Company, enforceable against the Company in accordance with its terms, except as the enforceability hereof may be limited by bankruptcy, insolvency, reorganization, moratorium or other similar laws relating to creditors’ rights generally or by general equitable principles (whether considered in an action at law or in equity) and except as the rights to indemnification and contribution hereunder may be limited by federal or state securities laws;

(x) the issue and sale of the Shares, the execution of this Agreement by the Company and the compliance by the Company with all of the provisions of this Agreement and the consummation of the transactions herein 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, any indenture, mortgage, deed of trust, loan agreement or other agreement or instrument to which the Company or any of the Subsidiaries is a party or by which the Company or any of the Subsidiaries is bound or to which any of the property or assets of the Company or any of the Subsidiaries is subject, nor will such action result in any violation of the provisions of the certificate or articles of incorporation or by-laws (or other organization documents) of the Company or any of the Subsidiaries or any statute or any order, rule or regulation of any court or governmental agency or body having jurisdiction over the Company or any of the Subsidiaries or any of their properties; and no consent, approval, authorization, order, registration or qualification of or with any such court or governmental agency or body is required for the issue and sale of the Shares or the consummation by the Company of the transactions contemplated by this Agreement, except the registration under the Securities Act of the Shares and such consents, approvals, authorizations, registrations or qualifications as may be required under state securities or Blue Sky laws in connection with the purchase and distribution of the Shares by the Underwriters;

(xi) (1) Ernst & Young, LLP, who have certified certain financial statements of the Company and the Subsidiaries are independent public accountants as required by the Securities Act, the Rules and Regulations, the Exchange Act and the rules and regulations promulgated thereunder, (2) the financial statements, together with related schedules and notes, included in the Registration Statement and the Pricing Prospectus comply in all material respects with the requirements of the

Securities Act and present fairly in all material respects the consolidated financial position, results of operations and changes in financial position of the Company and the Subsidiaries on the basis stated in the Registration Statement at the respective dates or for the respective periods to which they apply (3) such statements and related schedules and notes have been prepared in accordance with generally accepted accounting principles in the United States of America (“GAAP”) consistently applied throughout the periods involved, except as disclosed therein, and (4) the selected financial data and the summary financial data included in the Pricing Prospectus present fairly in all material respects the information shown therein and have been compiled on a basis consistent with that of the financial statements included in the Registration Statement;

(xii) neither the Company nor any Subsidiary has sustained since the date of the latest audited financial statements included in the Registration Statement or 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 Registration Statement or the Pricing Prospectus, and since the respective dates as of which information is given in the Registration Statement and the Pricing Prospectus, (1) other than as a result of the exercise of options to purchase common stock outstanding on the date of the Pricing Prospectus, there has not been any change in the capital stock or long-term debt of the Company or any of the Subsidiaries, (2) there has not been any event that would constitute a Material Adverse Effect, or any development involving a prospective event that would constitute a Material Adverse Effect, (3) there have been no transactions entered into by, and no obligations or liabilities, contingent or otherwise, incurred by the Company or any of the Subsidiaries, whether or not in the ordinary course of business, which are material to the Company and the Subsidiaries, considered as one enterprise, and (4) there has been no dividend or distribution of any kind declared, paid or made by the Company on any class of its capital stock, in each case, otherwise than as set forth or contemplated in the Registration Statement or the Pricing Prospectus;

(xiii) neither the Company nor any of the Subsidiaries is (1) in violation of its certificate or articles of incorporation or bylaws (or other organization documents), (2) in violation of any law, ordinance, administrative or governmental rule or regulation applicable to the Company or any of the Subsidiaries, (3) in violation of any decree of any court or governmental agency or body having jurisdiction over the Company or any of the Subsidiaries, or (4) in default in the performance of any obligation, agreement or condition contained in any bond, debenture, note or any other evidence of indebtedness or in any agreement, indenture, lease or other instrument to which the Company or any of the Subsidiaries is a party or by which any of them or any of their respective properties may be bound, except, in the case of clauses (2), (3) and (4), where any such violation or default, individually or in the aggregate, would not have a Material Adverse Effect;

(xiv) the Company and each Subsidiary has good and marketable title to all real and personal property owned by it, in each case free and clear of all liens, encumbrances and defects except such as are described in the Registration Statement and Pricing Prospectus or such as do not materially affect the value of such property and do not interfere with the use made and proposed to be made of such property by the Company or any Subsidiary, and any real property and buildings held under lease by the Company or any Subsidiary are held under valid, subsisting and enforceable leases with such exceptions as are not material and do not interfere with the use made and proposed to be made of such property and buildings by the Company or any Subsidiary;

(xv) other than as set forth in the Registration Statement and Pricing Prospectus, there are no legal or governmental proceedings pending to which the Company or any of the Subsidiaries is a party or of which any property of the Company or any of the Subsidiaries is the subject which, if determined adversely to the Company or the Subsidiary, individually or in the aggregate, would

have or may reasonably be expected to have a Material Adverse Effect, or would prevent or impair the consummation of the transactions contemplated by this Agreement, or which are required to be described in the Registration Statement or the Pricing Prospectus; and, to the best of the Company’s knowledge, no such proceedings are threatened or contemplated by governmental authorities or others;

(xvi) the Company and the Subsidiaries possess all permits, licenses, approvals, consents and other authorizations (collectively, “Permits”) issued by the appropriate federal, state, local or foreign regulatory agencies or bodies necessary to conduct the businesses now operated by them; the Company and the Subsidiaries are in compliance with the terms and conditions of all such Permits and all of the Permits are valid and in full force and effect, except, in each case, where the failure so to comply or where the invalidity of such Permits or the failure of such Permits to be in full force and effect, individually or in the aggregate, would not have a Material Adverse Effect, and neither the Company nor any Subsidiary has received any notice of proceedings relating to the revocation or material modification of any such Permits;

(xvii) the Company and the Subsidiaries own or possess, or can acquire on reasonable terms, all licenses, inventions, copyrights, know-how (including trade secrets and other unpatented and/or unpatentable proprietary or confidential information, systems or procedures), trademarks, service marks and trade names, patents and patent rights (collectively “Intellectual Property”) material to carrying on their businesses as described in the Pricing Prospectus, and neither the Company nor any Subsidiary has received any correspondence relating to any Intellectual Property or notice of infringement of or conflict with asserted rights of others with respect to any Intellectual Property which would render any Intellectual Property invalid or inadequate to protect the interest of the Company and the Subsidiaries and which infringement or conflict (if the subject of any unfavorable decision, ruling or finding) or invalidity or inadequacy, individually or in the aggregate, would have or may reasonably be expected to have a Material Adverse Effect;

(xviii) no labor dispute with the employees of the Company or the Subsidiaries exists, or, to the knowledge of the Company, is imminent;

(xix) the Company and the Subsidiaries are insured by insurers of recognized financial responsibility against such losses and risks and in such amounts as are prudent and customary in the businesses in which they are engaged, neither the Company nor any Subsidiary has been refused any insurance coverage sought or applied for, and the Company has no reason to believe that either it or any Subsidiary will not be able to renew its existing insurance coverage as and when such coverage expires or to obtain similar coverage from similar insurers as may be necessary to continue its business at a cost that would not have a Material Adverse Effect;

(xx) the Company and each of its Subsidiaries have made and keep books, records and accounts, which, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the Company and its Subsidiaries, and the Company maintains a system of internal accounting controls sufficient to provide reasonable assurance that (1) transactions are executed in accordance with management’s general or specific authorizations, (2) transactions are recorded as necessary to permit preparation of financial statements in conformity with GAAP and to maintain accountability for assets, (3) access to assets is permitted only in accordance with management’s general or specific authorization, and (4) the recorded accountability for assets is compared with the existing assets at reasonable intervals and appropriate action is taken with respect to any differences;

(xxi) since the date of the latest audited financial statements included in the Registration Statement and Pricing Prospectus, except as provided in the Registration Statement and Pricing Prospectus (1) the Company has not been advised of (A) any significant deficiencies in the design or operation of internal controls that could adversely affect the ability of the Company and each of its

Subsidiaries to record, process, summarize and report financial data, or any material weaknesses in internal controls or (B) any fraud, whether or not material, that involves management or other employees who have a significant role in the internal controls of the Company and each of its Subsidiaries, and (2) there has been no change in the Company’s internal control over financial reporting that has materially affected, or is reasonably likely to materially affect, the Company’s internal control over financial reporting;

(xxii) the Company maintains disclosure controls and procedures (as such term is defined in Rule 13a-15(e) of the Exchange Act) that comply with the requirements of the Exchange Act, and such disclosure controls and procedures are effective and there has been no failure on the part of the Company or any of its officers and directors, in their capacities as such, to comply in all material respects with such rule, and the Company has complied and continues to comply in all material respects with the corporate governance compliance guidelines set forth in the Nasdaq Marketplace Rules;

(xxiii) all United States federal income tax returns of the Company and the Subsidiaries required by law to be filed have been filed and all taxes shown by such returns or otherwise assessed, which are due and payable, have been paid, except assessments against which appeals have been or will be promptly taken and as to which adequate reserves have been provided, and the Company and the Subsidiaries have (1) filed all other tax returns that are required to have been filed by them pursuant to applicable foreign, state, local or other law, except insofar as the failure to file such returns, individually or in the aggregate, would not result in a Material Adverse Effect, and (2) paid all taxes due pursuant to such returns or pursuant to any assessment received by the Company or any Subsidiary except for such taxes, if any, as are being contested in good faith and as to which adequate reserves have been provided; and the charges, accruals and reserves on the books of the Company and the Subsidiaries in respect of any income and corporation tax liability for any years not finally determined are adequate to meet any assessments or re-assessments for additional income tax for any years not finally determined;

(xxiv) neither the Company nor any of the Subsidiaries is in violation of any statute or any rule, regulation, decision or order of any governmental agency or body or any court, domestic or foreign, relating to the use, production, disposal or release of hazardous or toxic substances or relating to the protection or restoration of the environment or human exposure to hazardous or toxic substances (collectively, “environmental laws”), owns or operates any real property contaminated with any substance that is subject to any environmental laws, is liable for any off-site disposal or contamination pursuant to any environmental laws, or is subject to any claim relating to any environmental laws, which violation, contamination, liability or claim, individually or in the aggregate, would have a Material Adverse Effect, and the Company is not aware of any pending investigation which might lead to such a claim;

(xxv) each employee benefit plan, within the meaning of Section 3(3) of the Employee Retirement Income Security Act of 1974, as amended (“ERISA”), that is maintained, administered or contributed to by the Company or any Subsidiary for employees or former employees of the Company and its affiliates has been maintained in compliance with its terms and the requirements of any applicable statutes, orders, rules and regulations, including but not limited to ERISA and the Internal Revenue Code of 1986, as amended (the “Code”), except to the extent that failure to so comply, individually or in the aggregate, would not have a Material Adverse Effect, and no prohibited transaction, within the meaning of Section 406 of ERISA or Section 4975 of the Code has occurred with respect to any such plan excluding transactions effected pursuant to a statutory or administrative exemption;

(xxvi) to the knowledge of the Company, neither the Company nor any of its Subsidiaries, or any director, officer, agent, employee or other person associated with or acting on behalf of the Company or any of its Subsidiaries, has (1) used any corporate funds for any unlawful contribution,

gift, entertainment or other unlawful expense relating to political activity, (2) made any direct or indirect unlawful payment to any foreign or domestic government official or employee from corporate funds, (3) violated or is in violation of any provision of the Foreign Corrupt Practices Act of 1977, or (4) made any bribe, unlawful rebate, payoff, influence payment, kickback or other unlawful payment;

(xxvii) except as described in the Registration Statement and Pricing Prospectus, neither the Company nor any Subsidiary has outstanding, and at the Closing Date and the Option Closing Date, if any, will have outstanding any options to purchase or any warrants to subscribe for, or any securities or obligations convertible into, or any contracts or commitments to issue or sell, any Shares or any such warrants, convertible securities or obligations, and there are no persons with registration rights or other similar rights to have securities registered in connection with the filing of the Registration Statement or otherwise registered by the Company under the Securities Act;

(xxviii) the Company is not and, after giving effect to the offering and sale of the Shares as contemplated herein and the application of the net proceeds therefrom as described in the Registration Statement and Pricing Prospectus, will not be an “investment company,” as such term is defined in the Investment Company Act of 1940, as amended;

(xxix) the Company has not distributed and, prior to the later to occur of the Closing Date and completion of distribution of the Shares, will not distribute any offering materials in connection with the offering and sale of the Shares, other than the Pricing Prospectus, the Prospectus and, subject to compliance with Section 6, any Issuer Free Writing Prospectus; and the Company has not taken and will not take, directly or indirectly, any action designed to cause or result in, or which constitutes or might reasonably be expected to constitute, the stabilization or manipulation of the price of any security of the Company to facilitate the sale or resale of the Shares or for any other purpose;

(xxx) Other than as contemplated by this Agreement, there is no broker, finder or other party that is entitled to receive from the Company or any Subsidiary any brokerage or finder’s fee or any other fee, commission or payment as a result of the transactions contemplated by this Agreement; and

(xxxi) any certificate signed by any officer of the Company delivered to the Underwriters or to counsel for the Underwriters shall be deemed a representation and warranty by the Company to the Underwriters as to the matters covered thereby.

(b) [Reserved]

2. Subject to the terms and conditions herein set forth, (a) 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 share of $11.8125 (the “Purchase Price”), the number of Firm Shares (to be adjusted by you so as to eliminate fractional shares) determined by multiplying the aggregate number of Firm Shares to be sold by the Company hereunder by a fraction, the numerator of which is the aggregate number of Firm Shares to be purchased by such Underwriter as set forth opposite the name of such Underwriter in Schedule I hereto and the denominator of which is the aggregate number of Firm Shares to be purchased by all of the Underwriters from the Company hereunder and (b) in the event and to the extent that the Underwriters shall exercise the election to purchase Option Shares as provided below, 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 the Purchase Price, the number of Option Shares (to be adjusted by you so as to eliminate fractional shares) determined by multiplying the number of Option Shares as to which such election shall have been exercised by the fraction set forth in clause (a) above.

The Company hereby grants to the Underwriters the right to purchase at their election up to 600,000 Option Shares, at the Purchase Price, for the sole purpose of covering over-allotments in connection with the sale of the Firm Shares. The Underwriters may exercise their option to acquire Option Shares in whole or in part from time to time only by written notice from the Representatives to the Company, given within a period of thirty (30) calendar days after the date of this Agreement and setting forth the aggregate number of Option Shares to be purchased and the date on which such Option Shares are to be delivered, as determined by the Representatives but in no event earlier than the Closing Date or, unless the Representatives and the Company otherwise agree in writing, earlier than two or later than ten business days after the date of such notice.

3. It is understood that the several Underwriters propose to offer the Firm Shares for sale to the public upon the terms and conditions set forth in the Prospectus.

4. The Company will deliver the Firm Shares to the Representatives through the facilities of the Depository Trust Company (“DTC”) for the accounts of the Underwriters, against payment of the purchase price therefor in Federal (same day) funds by wire transfer drawn to the order of the Company at the office of Xxxxx, Xxxx & Xxxxxxxx, X.X. (“Xxxxx Xxxx”), at 10:00 A.M., St. Louis time, on April 29, 2010 or at such other time not later than seven full business days thereafter as the Representatives and the Company determine, such time being herein referred to as the “Closing Date.” For purposes of Rule 15c6-1 under the Exchange Act, the Closing Date (if later than the otherwise applicable settlement date) shall be the settlement date for payment of funds and delivery of securities for all the Firm Shares. The certificates for the Firm Shares so to be delivered will be in definitive form, in such denominations and registered in such names as the Representatives request and will be made available for checking and packaging at the above office of Xxxxx Xxxx at least 24 hours prior to the Closing Date.

Each time for the delivery of and payment for the Option Shares, being herein referred to as an “Option Closing Date,” which may be the Closing Date, shall be determined by the Representatives as provided above. The Company will deliver the Option Shares being purchased on each Option Closing Date to the Representatives through the facilities of DTC for the accounts of the Underwriters, against payment of the purchase price therefor in Federal (same day) funds by official bank check or checks or wire transfer drawn to the order of the Company at the above office of Xxxxx Xxxx, at 10:00 A.M., St. Louis time on the applicable Option Closing Date. The certificates for the Option Shares so to be delivered will be in definitive form, in such denominations and registered in such names as the Representatives request and will be made available for checking and packaging at the above office of Xxxxx Xxxx at least 24 hours prior to such Option Closing Date.

5. The Company covenants and agrees with each of the Underwriters as follows:

(a) The Company, subject to Section 5(b), will comply with the requirements of Rule 430B under the Securities Act, and will notify the Representatives immediately, and confirm the notice in writing, (i) when any post-effective amendment to the Registration Statement shall become effective, or any supplement to the Prospectus or any amended prospectus shall have been filed, to furnish the Representatives with copies thereof, and to file promptly all material required to be filed by the Company with the Commission pursuant to Rule 433(d) under the Securities Act, (ii) of the receipt of any comments from the Commission, (iii) of any request by the Commission for any amendment to the Registration Statement or any amendment or supplement to the Prospectus or for additional information, and (iv) of the issuance by the Commission of any stop order suspending the effectiveness of the Registration Statement or of any order preventing or suspending the use of any Preliminary Prospectus, or of the suspension of the qualification of the Shares for offering or sale in any jurisdiction, or of the initiation or threatening of any proceedings for any of such purposes. The Company will promptly effect the filings necessary pursuant to Rule 424(b) under the Securities Act. The Company will make every

reasonable effort to prevent the issuance of any stop order and, if any stop order is issued, to obtain the lifting thereof at the earliest possible moment.

(b) The Company will give the Representatives notice of its intention to file or prepare any amendment to the Registration Statement (including any filing under Rule 462(b) under the Securities Act), or any amendment, supplement or revision to the Prospectus, or any Issuer Free Writing Prospectus, will furnish the Representatives with copies of any such documents a reasonable amount of time prior to such proposed filing or use, as the case may be, and will not file or use any such document to which the Representatives or counsel for the Underwriters shall reasonably object.

(c) The Company will use its best efforts to qualify the Shares for offering and sale under the securities laws of such jurisdictions as you may reasonably 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 Shares, provided that nothing in this Section 5(c) shall require the Company to qualify as a foreign corporation in any jurisdiction in which it is not already so qualified, or to file a general consent to service of process in any jurisdiction.

(d) The Company has furnished or will deliver to the Representatives, without charge, two signed copies of the Initial Registration Statement as originally filed, any Rule 462(b) Registration Statement and of each amendment to each (including exhibits filed therewith or incorporated by reference therein) and signed copies of all consents and certificates of experts, and will also, upon your request, deliver to the Representatives, without charge, a conformed copy of the Registration Statement as originally filed and of each amendment thereto (without exhibits) for each of the Underwriters. The copies of the Registration Statement and each amendment thereto furnished to the Underwriters will be identical to the electronically transmitted copies thereof filed with the Commission pursuant to XXXXX, except to the extent permitted by Regulation S-T.

(e) The Company has delivered to each Underwriter, without charge, as many written and electronic copies of each Preliminary Prospectus as such Underwriter reasonably requested, and the Company hereby consents to the use of such copies for purposes permitted by the Securities Act. The Company will furnish to each Underwriter, without charge, prior to 5:00 P.M. Eastern Time on the business day next succeeding the date of this Agreement and from time to time thereafter during the period when the Prospectus is required to be delivered in connection with sales of the Shares under the Securities Act or the Exchange Act or in lieu thereof, the notice referred to in Rule 173(a) under the Securities Act, such number of written and electronic copies of the Prospectus (as amended or supplemented) as such Underwriter may reasonably request. The Prospectus and any amendments or supplements thereto furnished to the Underwriters will be identical to the electronically transmitted copies thereof filed with the Commission pursuant to XXXXX, except to the extent permitted by Regulation S-T.

(f) The Company will comply with the Securities Act and the Rules and Regulations so as to permit the completion of the distribution of the Shares as contemplated in this Agreement and in the Prospectus. If at any time when, in the opinion of counsel for the Underwriters, a prospectus is required to be delivered in connection with sales of the Shares under the Securities Act or the Exchange Act (or in lieu thereof, the notice referred to in Rule 173(a) under the Securities Act), any event shall occur or condition shall exist as a result of which it is necessary, in the opinion of counsel for the Underwriters or for the Company, to amend the Registration Statement or amend or supplement the Prospectus in order that the Prospectus will not include any untrue statements of a material fact or omit to state a material fact necessary in order to make the statements therein not misleading in the light of the circumstances existing at the time it (or in lieu thereof, the notice referred to in Rule 173(a) under the Securities Act) is delivered to a purchaser, or if it shall be necessary, in the opinion of either such counsel, at any such time to amend the Registration Statement or amend or supplement the Prospectus in order to

comply with the requirements of the Securities Act or the Rules and Regulations, the Company will promptly prepare and file with the Commission, subject to Section 5(b), such amendment or supplement as may be necessary to correct such statement or omission or to make the Registration Statement or the Prospectus comply with such requirements, and the Company will furnish to the Underwriters such number of written and electronic copies of such amendment or supplement as the Underwriters may reasonably request. The Company will provide the Representatives with notice of the occurrence of any event during the period specified above that may give rise to the need to amend or supplement the Registration Statement or the Prospectus as provided in the preceding sentence promptly after the occurrence of such event.

(g) The Company will make generally available (within the meaning of Section 11(a) of the Securities Act) to its security holders and to the Representatives as soon as practicable, but not later than 45 days after the end of its fiscal quarter in which the first anniversary date of the effective date of the Registration Statement occurs, an earnings statement (in form complying with the provisions of Rule 158 under the Securities Act) covering a period of at least twelve consecutive months beginning after the effective date of the Registration Statement.

(h) The Company will use the net proceeds received by it from the sale of the Shares in the manner specified in the Pricing Prospectus under the heading “Use of Proceeds.”

(i) The Company will use its best efforts to effect and maintain the listing for quotation of the Common Stock (including the Shares) on Nasdaq.

(j) During a period of ninety (90) days from the date of the Prospectus, the Company will not, without the prior written consent of the Representatives, (i) offer, pledge, sell, contract to sell, sell any option or contract to purchase, purchase any option or contract to sell, grant any option, right or warrant to purchase, lend or otherwise transfer or dispose of, directly or indirectly, any Common Stock or any securities convertible into or exercisable or exchangeable for Common Stock or (ii) enter into any swap or other agreement that transfers, in whole or in part, any of the economic consequences of ownership of Common Stock, whether any such transaction described in clause (i) or (ii) above is to be settled by delivery of Common Stock or such other securities, in cash or otherwise, other than (1) the Shares to be sold hereunder, (2) the issuance of options to acquire shares of Common Stock granted pursuant to the Company’s benefit plans existing on the date hereof that are referred to in the Prospectus, as such plans may be amended or (3) the issuance of shares of Common Stock upon the exercise of any such options. Notwithstanding the foregoing, if (A) during the last 17 days of the 90-day restricted period the Company issues an earnings release or material news or a material event relating to the Company occurs; or (B) prior to the expiration of the 90-day restricted period, the Company announces that it will release earnings results during the 16-day period beginning on the last day of the 90-day period, the restrictions imposed by this agreement shall continue to apply until the expiration of the 18-day period beginning on the issuance of the earnings release or the occurrence of the material news or material event. The Company shall promptly notify the Representatives of any earnings release, news or event that may give rise to an extension of the initial 90-day restricted period.

(k) The Company, during the period when the Prospectus is required to be delivered in connection with sales of the Shares under the Securities Act or the Exchange Act (or in lieu thereof, the notice referred to in Rule 173(a) under the Securities Act), will file all documents required to be filed with the Commission pursuant to the Exchange Act within the time periods required by the Exchange Act and the rules and regulations of the Commission thereunder.

(l) During a period of five years from the effective date of the Registration Statement, the Company will furnish to you copies of all reports or other communications (financial or other) furnished to shareholders generally, and to deliver to you (i) as soon as they are available, copies of

any reports and financial statements furnished to or filed with the Commission or any national securities exchange on which any class of securities of the Company is listed (provided, that the Company shall be deemed to have furnished and delivered such documents if and when such documents are available through XXXXX on the Commission’s website); and (ii) such additional information concerning the business and financial condition of the Company as you may from time to time reasonably request (such financial statements to be on a consolidated basis to the extent the accounts of the Company and the Subsidiaries are consolidated in reports furnished to its shareholders generally or to the Commission).

(m) If the Company elects to rely upon Rule 462(b) under the Securities Act, the Company will file a Rule 462(b) Registration Statement with the Commission in compliance with Rule 462(b) by 10:00 P.M., Washington, D.C. time, on the date of this Agreement, and at the time of filing either pay to the Commission the filing fee for the Rule 462(b) Registration Statement or give irrevocable instructions for the payment of such fee pursuant to Rule 111(b) under the Securities Act.

(n) If so requested by the Representatives, the Company shall cause to be prepared and delivered, at its expense, within one business day from the effective date of this Agreement, to the Representatives an “electronic Prospectus” to be used by the Underwriters in connection with the offering and sale of the Shares. As used herein, the term “electronic Prospectus” means a form of the most recent Preliminary Prospectus, any Issuer Free Writing Prospectus or the Prospectus, and any amendment or supplement thereto, that meets each of the following conditions: (i) it shall be encoded in an electronic format, satisfactory to the Representatives, that may be transmitted electronically by the Representatives and the other Underwriters to offerees and purchasers of the Shares, (ii) it shall disclose the same information as such paper Preliminary Prospectus, Issuer Free Writing Prospectus or the Prospectus, as the case may be; and (iii) it shall be in or convertible into a paper format or an electronic format, satisfactory to the Representatives, that will allow investors to store and have continuously ready access to such Preliminary Prospectus, Issuer Free Writing Prospectus or the Prospectus at any future time, without charge to investors (other than any fee charged for subscription to the Internet generally). The Company hereby confirms that, if so requested by the Representatives, it has included or will include in the Prospectus filed with the Commission an undertaking that, upon receipt of a request by an investor or his or her representative, the Company shall transmit or cause to be transmitted promptly, without charge, a paper copy of such paper Preliminary Prospectus, Issuer Free Writing Prospectus or the Prospectus to such investor or representative.

(a) The Company represents and agrees that, without the prior consent of the Representatives, it has not made and will not make any offer relating to the Shares that would constitute a “free writing prospectus” as defined in Rule 405 under the Securities Act; 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 Shares that would constitute a free writing prospectus; any such free writing prospectus the use of which has been consented to by the Company and the Representatives is listed on Schedule II hereto;

(b) The Company has complied and will comply with the requirements of Rule 433 under the Securities Act applicable to any Issuer Free Writing Prospectus, including timely filing with the Commission or retention where required and legending; and the Company represents that it has satisfied and agrees that it will satisfy the conditions under Rule 433 under the Securities Act to avoid a requirement to file with the Commission any electronic road show;

(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 light of the circumstances then prevailing, not misleading, the Company will give prompt notice thereof to the Representatives 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 strict conformity with information furnished in writing to the Company by an Underwriter through the Representatives expressly for use therein.

7. [Reserved]

8. The Company covenants and agrees with the several Underwriters that, whether or not the transactions contemplated by this Agreement are consummated, the Company will pay or cause to be paid all expenses incident to the performance of its obligations under this Agreement, including (i) the fees, disbursements and expenses of the Company’s counsel, accountants and other advisors; (ii) filing fees and all other expenses in connection with the preparation, printing and filing of the Registration Statement, each 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; (iii) the cost of printing or producing this Agreement, closing documents (including any compilations thereof) and such other documents as may be required in connection with the offering, purchase, sale and delivery of the Shares; (iv) all expenses in connection with the qualification of the Shares for offering and sale under state securities laws as provided in Section 5(c), including filing fees and the reasonable fees and disbursements of counsel for the Underwriters in connection with such qualification and in connection with the Blue Sky survey; (v) all fees and expenses in connection with listing the Common Stock (including the Shares) on Nasdaq; (vi) the filing fees incident to, and the reasonable fees and disbursements of counsel for the Underwriters in connection with, securing any required review by the Financial Industry Regulatory Authority (“FINRA”) of the terms of the sale of the Shares; (vii) all fees and expenses in connection with the preparation, issuance and delivery of the certificates representing the Shares to the Underwriters, including any stock or other transfer taxes and any stamp or other duties payable upon the sale, issuance or delivery of the Shares to the Underwriters; (viii) the cost and charges of any transfer agent or registrar; (ix) the transportation and other expenses incurred by the Company in connection with presentations to prospective purchasers of Shares; and (x) all other costs and expenses incident to the performance of its obligations hereunder which are not otherwise specifically provided for in this Section.

9. The several obligations of the Underwriters hereunder to purchase the Shares on the Closing Date or each Option Closing Date, as the case may be, are subject to the performance by the Company of its obligations hereunder and to the following additional conditions:

(a) The Prospectus shall have been filed with the Commission pursuant to Rule 424(b) under the Securities Act within the applicable time period prescribed for such filing by the Rules and Regulations and in accordance with Section 5(a); all material required to be filed by the Company pursuant to Rule 433(d) under the Securities Act shall have been filed with the Commission within the applicable time period prescribed for such filing by Rule 433 under the Securities Act; if the Company has elected to rely upon Rule 462(b) under the Securities Act, the Rule 462(b) Registration Statement shall have become effective by 10:00 P.M., Washington, D.C. time, on the date of this Agreement; no stop order suspending the effectiveness of the Registration Statement or any part thereof or the Prospectus or any part thereof or any Issuer Free Writing Prospectus shall have been issued and no proceeding for that purpose shall have been initiated or threatened by the Commission or any state securities commission; and all requests for additional information on the part of the Commission shall have been complied with to the Underwriters’ reasonable satisfaction.

(b) The representations and warranties of the Company contained herein are true and correct in all material respects on and as of the Closing Date or the Option Closing Date, as the case may be, as if made on and as of the Closing Date or the Option Closing Date, as the case may be, and the Company shall have complied with all agreements and all conditions on its part to be performed or satisfied hereunder at or prior to the Closing Date or the Option Closing Date, as the case may be.

(c) (i) Neither the Company nor any Subsidiary shall have sustained since the date of the latest audited financial statements included 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 (ii) since the respective dates as of which information is given in the Registration Statement and the Prospectus, (1) there shall not have been any change in the capital stock or long-term debt of the Company or any Subsidiary, other than as a result of the exercise of options outstanding as of the date of the Pricing Prospectus, or (2) there shall not have been any material adverse change, or any development involving a prospective material adverse change, in or affecting the general affairs, business, prospects, management, financial position, shareholders’ equity or results of operations of the Company and the Subsidiaries, considered as one enterprise, 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 Shares being delivered at such Closing Date or Option Closing Date, as the case may be, on the terms and in the manner contemplated in the Pricing Prospectus.

(d) The Representatives shall have received on and as of the Closing Date and the Option Closing Date, as the case may be, a certificate of two executive officers of the Company, at least one of whom has specific knowledge about the Company’s financial matters, satisfactory to the Representatives, to the effect (i) that the matters set forth in Section 9(b) are true and correct (with respect to the respective representations, warranties, agreements and conditions of the Company), (ii) that none of the situations set forth in clause (i) or (ii) of Section 9(c) shall have occurred, and (iii) that no stop order suspending the effectiveness of the Registration Statement has been issued and to the knowledge of the Company, no proceedings for that purpose have been instituted or are pending or contemplated by the Commission;

(e) On the Closing Date and the Option Closing Date, as the case may be, Xxxxxxx Xxxxxxx LLP, counsel for the Company, shall have furnished to the Representatives its favorable written opinion, dated the Closing Date or the Option Closing Date, as the case may be, in form and substance satisfactory to counsel for the Underwriters, to the effect set forth in Exhibit A hereto and to such further effect as counsel for the Underwriters may reasonably request. In giving such opinion, Xxxxxxx Sandler may rely as to matters of fact upon statements and verification of officers of the Company and of other appropriate persons and may rely as to matters of Oklahoma law upon the opinion of Hert, Baker, Koemel and Xxxxx, P.C.

(f) On the date of this Agreement, Ernst & Young, LLP shall have furnished to the Representative a letter, dated the date of delivery thereof, in form and substance satisfactory to the Representative, containing statements and information of the type customarily included in accountants’ “comfort letters” to underwriters with respect to the financial statements and certain financial information contained in the Registration Statement and the Prospectus.

(g) On the Closing Date or Option Closing Date, as the case may be, the Representatives shall have received from Ernst & Young, LLP a letter, dated the Closing Date or such Option Closing Date, as the case may be, to the effect that they reaffirm the statements made in the letter

or letters furnished pursuant to Section 9(f) except that the specified date referred to shall be a date not more than three business days prior to the Closing Date or such Option Closing Date, as the case may be.

(h) On the Closing Date or Option Closing Date, as the case may be, Xxxxx Xxxx, counsel for the Underwriters, shall have furnished to the Representatives their favorable opinion dated the Closing Date or the Option Closing Date, as the case may be, with respect to the due authorization and valid issuance of the Shares, the Registration Statement, the Prospectus and other related 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. In giving such opinion, Xxxxx Xxxx may rely as to matters of fact upon statements and certifications of officers of the Company and of other appropriate persons and may rely as to matters of Oklahoma law upon the opinion of Hert, Baker, Koemel and Xxxxx, P.C.

(i) The Shares to be delivered on the Closing Date or Option Closing Date, as the case may be, shall have been approved for listing on Nasdaq, subject to official notice of issuance.

(j) FINRA shall have confirmed that it has not raised any objection with respect to the fairness and reasonableness of the underwriting terms and conditions.

(k) The Representatives shall have received “lock-up” agreements, each substantially in the form of Exhibit B hereto, from all the executive officers and directors of the Company and such agreements shall be in full force and effect on the Closing Date or Option Closing Date, as the case may be.

(l) On or prior to the Closing Date or Option Closing Date, as the case may be, the Company shall have furnished to the Representatives such further information, certificates and documents as the Representatives shall reasonably request.

(m) 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 Nasdaq; (ii) a suspension or material limitation in trading in the Company’s securities on Nasdaq; (iii) a general moratorium on commercial banking activities declared by any of Federal, New York, Oklahoma, Kansas, 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 Shares being delivered at such Closing Date or Option Closing Date, as the case may be, on the terms and in the manner contemplated in the Prospectus;

If any condition specified in this Section 9 shall not have been fulfilled when and as required to be fulfilled, this Agreement may be terminated, subject to the provisions of Section 13, by the Representatives by notice to the Company at any time at or prior to the Closing Date or Option Closing Date, as the case may be, and such termination shall be without liability of any party to any other party, except as provided in Section 13.

10.

(a) The Company agrees to indemnify and hold harmless each Underwriter and each person, if any, who controls any Underwriter within the meaning of Section 15 of the Securities Act or Section 20(a) of the Exchange Act against any and all losses, liabilities, claims, damages and expenses

whatsoever as incurred (including without limitation, reasonable attorneys’ fees and any and all reasonable expenses whatsoever incurred in investigating, preparing or defending against any litigation, commenced or threatened, or any claim whatsoever, and any and all amounts paid in settlement of any claim or litigation), joint or several, to which they or any of them may become subject under the Securities Act, the Exchange Act or otherwise, insofar as such losses, liabilities, claims, damages or expenses (or actions in respect thereof) arise out of or are based upon any untrue statement or alleged untrue statement of a material fact contained in the Initial Registration Statement, as originally filed or any amendment thereof, the Registration Statement, or any post-effective amendment thereof, any Preliminary Prospectus, the Pricing Prospectus or the Prospectus, or in any supplement thereto or amendment thereof, any Issuer Free Writing Prospectus, or any “issuer information” filed or required to be filed pursuant to Rule 433(d) under the Securities 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; provided, however, that the Company will not be liable in any such case to the extent that any such loss, liability, claim, damage or expense arises out of or is based upon any such untrue statement or alleged untrue statement or omission or alleged omission made in the Initial Registration Statement, as originally filed or any amendment thereof, the Registration Statement, or any post-effective amendment thereof, any Preliminary Prospectus, the Pricing Prospectus or the Prospectus, or in any supplement thereto or amendment thereof, or any Issuer Free Writing Prospectus in reliance upon and in strict conformity with written information furnished to the Company by or on behalf of any Underwriter through the Representatives expressly for use therein, it being understood and agreed that the only such information furnished by any Underwriter is the information described as such in Section 10(b) below.

(b) Each Underwriter severally, and not jointly, agrees to indemnify and hold harmless the Company, each of the directors of the Company, each of the officers of the Company who shall have signed the Registration Statement, and each other person, if any, who controls the Company within the meaning of Section 15 of the Securities Act or Section 20(a) of the Exchange Act, against any losses, liabilities, claims, damages and expenses whatsoever as incurred (including without limitation, reasonable attorneys’ fees and any and all reasonable expenses whatsoever incurred in investigating, preparing or defending against any litigation, commenced or threatened, or any claim whatsoever, and any and all amounts paid in settlement of any claim or litigation), joint or several, to which they or any of them may become subject under the Act, the Exchange Act or otherwise, insofar as such losses, liabilities, claims, damages or expenses (or actions in respect thereof) arise out of or are based upon any untrue statement or alleged untrue statement of a material fact contained in the Initial Registration Statement, as originally filed or any amendment thereof, the Registration Statement, or any post-effective amendment thereof, or any Preliminary Prospectus, the Pricing Prospectus or the Prospectus, or in any supplement thereto or amendment thereof, 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 any such loss, liability, claim, damage or expense arises out of or is based upon any such untrue statement or alleged untrue statement or omission or alleged omission made therein in reliance upon and in strict conformity with written information furnished to the Company by or on behalf of such Underwriter through the Representatives expressly for use therein, it being understood and agreed that the only such information furnished by any Underwriter consists of the following information in the Prospectus furnished on behalf of each Underwriter: the fourth paragraph of the cover page concerning the terms of the offering by the Underwriters, the names of the Underwriters and the Share purchase amounts in the table below the first paragraph under the caption “Underwriting,” the concession and reallowance figures appearing under the heading “Commissions and Expenses” under the caption “Underwriting” and the information contained under the heading “Stabilization” under the caption “Underwriting.”

(c) Promptly after receipt by an indemnified party under Section 10(a) or 10(b) 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 Section, notify each party against whom indemnification is to be sought in writing of the commencement thereof (but the failure so to notify an indemnifying party shall not relieve it from any liability which it may have under this Section 10). In case any such action is brought against any indemnified party, and it notifies an indemnifying party of the commencement thereof, the indemnifying party will be entitled to participate therein, and jointly with any other indemnifying party similarly notified, to the extent it may elect by written notice delivered to the indemnified party promptly after receiving the aforesaid notice from such indemnified party, to assume the defense thereof with counsel reasonably satisfactory to such indemnified party (who shall not, except with the consent of the indemnified party, be counsel to the indemnified party). Notwithstanding the foregoing, the indemnified party or parties shall have the right to employ its or their own counsel in any such case, but the fees and expenses of such counsel shall be at the expense of such indemnified party or parties unless (i) the employment of such counsel shall have been authorized in writing by one of the indemnifying parties in connection with the defense of such action, (ii) the indemnifying parties shall not have employed counsel to have charge of the defense of such action within a reasonable time after notice of commencement of the action, or (iii) such indemnified party or parties shall have reasonably concluded that there may be defenses available to it or them which are different from or additional to those available to one or all of the indemnifying parties (in which case the indemnifying parties shall not have the right to direct the defense of such action on behalf of the indemnified party or parties), in any of which events such fees and expenses shall be borne by the indemnifying parties. In no event shall the indemnifying parties be liable for fees and expenses of more than one counsel (in addition to any local counsel) separate from their own counsel for all indemnified parties in connection with any one action or separate but similar or related actions in the same jurisdiction arising out of the same general allegations or circumstances, which counsel, in the event of indemnified parties under Section 10(a) shall be selected by the Representatives. 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) [Reserved]

(e) If the indemnification provided for in this Section 10 is unavailable to or insufficient to hold harmless an indemnified party under Section 10(a) or 10(b) in respect of any losses, liabilities, claims, damages or expenses (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, liabilities, claims, damages or expenses (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 Shares. If, however, the allocation provided by the immediately preceding sentence is not permitted by applicable law, 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, liabilities, claims, damages or expenses (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 from the offering of the Shares 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 contributions pursuant to this Section 10(e) 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 Section 10(e). The amount paid or payable by an indemnified party as a result of the losses, liabilities, claims, damages or expenses (or actions in respect thereof) referred to above in this Section 10(e) 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 Section 10(e), no Underwriter shall be required to contribute any amount in excess of the amount by which the total price at which the Shares 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 Securities Act) shall be entitled to contribution from any person who was not guilty of such fraudulent misrepresentation. The Underwriters’ obligations in this Section 10(e) to contribute are several in proportion to their respective underwriting obligations and not joint.

(f) The obligations of the parties to this Agreements contained in this Section 10 are not exclusive and shall not limit any rights or remedies which may otherwise be available to any indemnified party at law or in equity.

11. If any Underwriter or Underwriters default in its or their obligations to purchase Shares hereunder on the Closing Date or any Option Closing Date and the aggregate number of Shares that such defaulting Underwriter or Underwriters agreed but failed to purchase does not exceed 15% of the total number of Shares that the Underwriters are obligated to purchase on such Closing Date or Option Closing Date, as the case may be, the Representatives may make arrangements satisfactory to the Company for the purchase of such Shares by other persons, including any of the Underwriters, but if no such arrangements are made by such Closing Date or Option Closing Date, as the case may be, the non-defaulting Underwriters shall be obligated severally, in proportion to their respective commitments hereunder, to purchase the Shares that such defaulting Underwriters agreed but failed to purchase on such Closing Date or Option Closing Date, as the case may be. If any Underwriter or Underwriters so default and the aggregate number of Shares with respect to which such default or defaults occur exceeds 15% of the total number of Shares that the Underwriters are obligated to purchase on such Closing Date or Option Closing Date, as the case may be, and arrangements satisfactory to the Representatives and the Company for the purchase of such Shares by other persons are not made within 36 hours after such default, this Agreement will terminate, subject to the provisions of Section 13, without liability on the part of any non-defaulting Underwriter or the Company, except as provided in Section 13. Nothing herein will relieve a defaulting Underwriter from liability for its default.

In the event of any such default which does not result in a termination of this Agreement, either the Representatives or the Company shall have the right to postpone the Closing Date or the relevant Option Closing Date, as the case may be, for a period not exceeding seven days in order to effect any required changes in the Registration Statement or Prospectus or in any other documents or arrangements. As used in this Agreement, the term “Underwriter” includes any person substituted for an Underwriter under this Section 11.

12. Notwithstanding anything herein contained, this Agreement (or the obligations of the several Underwriters with respect to any Option Shares which have yet to be purchased) may be terminated, subject to the provisions of Section 13, in the absolute discretion of the Representatives, by notice given to the Company, if after the execution and delivery of this Agreement and prior to the Closing Date or the Option Closing Date, as the case may be, (a) trading generally on the American Stock Exchange or the New York Stock Exchange or on Nasdaq shall have been suspended or materially limited, or minimum or maximum prices for trading have been fixed, or maximum ranges for prices have been required, by any of said exchanges or by such system or by order of the Commission, FINRA or any other governmental authority, (b) trading of any securities of or guaranteed by the Company or any Subsidiary shall have been suspended on any exchange or in any over-the-counter market, (c) a general moratorium on commercial banking activities in New York, Oklahoma, Kansas or Texas shall have been declared by Federal, New York, Oklahoma, Kansas or Texas State authorities or a new restriction materially adversely affecting the distribution of the Firm Shares or the Option Shares, as the case may be, shall have become effective, or (d) there has occurred any material adverse change in the financial markets in the United States or the international financial markets, any outbreak of hostilities or escalation thereof or other calamity or crisis or any change or development involving a prospective change in national or international political, financial or economic conditions, in each case the effect of which is such as to make it, in the judgment of the Representatives, impracticable to market the Shares to be delivered on the Closing Date or Option Closing Date, as the case may be, or to enforce contracts for the sale of the Shares.

If this Agreement is terminated pursuant to this Section 12, such termination will be without liability of any party to any other party except as provided in Section 13.

13. The respective indemnities, agreements, representations, warranties and other statements of the Company or its officers and of the several Underwriters set forth in or made pursuant to this Agreement will remain in full force and effect, regardless of any investigation, or statement as to the results thereof, made by or on behalf of any Underwriter, the Company or any of their respective representatives, officers or directors or any controlling person, and will survive delivery of and payment for the Shares. If this Agreement is terminated pursuant to Section 9, 11 or 12 or if for any reason the purchase of any of the Shares by the Underwriters is not consummated, the Company shall remain responsible for the expenses to be paid or reimbursed by it pursuant to Section 8, the respective obligations of the Company and the Underwriters pursuant to Section 10 and the provisions of Sections 13, 14 and 17 shall remain in effect and, if any Shares have been purchased hereunder the representations and warranties in Section 1 and all obligations under Section 5 and Section 6 shall also remain in effect. If this Agreement shall be terminated by the Underwriters, or any of them, under Section 9 or otherwise because of any failure or refusal on the part of the Company to comply with the terms or to fulfill any of the conditions of this Agreement, or if for any reason the Company shall be unable to perform its obligations under this Agreement or any condition of the Underwriters’ obligations cannot be fulfilled, the Company agrees to reimburse the Underwriters or such Underwriters as have so terminated this Agreement with respect to themselves, severally, for all out-of-pocket expenses (including the fees and expenses of its counsel) reasonably incurred by the Underwriter in connection with this Agreement or the offering contemplated hereunder.

14. This Agreement shall inure to the benefit of and be binding upon the Company and the Underwriters, the officers and directors of the Company referred to herein, any controlling persons referred to herein and their respective successors and assigns. Nothing expressed or mentioned in this Agreement is intended or shall be construed to give any other person, firm or corporation any legal or equitable right, remedy or claim under or in respect of this Agreement or any provision herein contained. No purchaser of Shares from any Underwriter shall be deemed to be a successor or assign by reason merely of such purchase.

15. All notices and other communications hereunder shall be in writing and shall be deemed to have been duly given upon receipt thereof by the recipient if mailed or transmitted by any standard form of telecommunication. Notices to the Representatives shall be given to them at Xxxxxx, Xxxxxxxx & Company, Incorporated, One Financial Plaza, 000 Xxxxx Xxxxxxxx, Xx. Xxxxx, Xxxxxxxx 00000 (fax no.: 000-000-0000); Attention: Xxxx X. Xxxx, with a copy to Xxxxxx, Xxxxxxxx & Company, Incorporated, Xxx Xxxxx Xxxxxx, 00xx Xxxxx, Xxxxxxxxx, Xxxxxxxx 00000; Attention: Xxxxxxx X. Xxxxxxx, Esq.. Notices to the Company shall be given to it at Southwest Bancorp, Inc., 000 Xxxxx Xxxx Xxxxxx, Xxxxxxxxxx, Xxxxxxxx 00000 (fax no.: 000-000-0000); Attention: Xxxx Xxxxx.

16. This Agreement may be signed in counterparts, each of which shall be an original and all of which together shall constitute one and the same instrument. In the event that any signature to this Agreement or any amendment hereto is delivered by facsimile transmission or by e-mail delivery of a “.pdf” format data file, such signature shall create a valid and binding obligation of the party executing (or on whose behalf such signature is executed) with the same force and effect as if such facsimile or “.pdf” signature page were an original thereof. At the request of any party each other party shall promptly re-execute an original form of this Agreement or any amendment hereto and deliver the same to the other party. No party hereto shall raise the use of a facsimile machine or e-mail delivery of a “.pdf” format data file to deliver a signature to this Agreement or any amendment hereto or the fact that such signature was transmitted or communicated through the use of a facsimile machine or e-mail delivery of a “.pdf” format data file as a defense to the formation or enforceability of a contract, and each party hereto forever waives any such defense.

17. THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF MISSOURI, WITHOUT REGARD TO SUCH STATE’S PRINCIPLES OF CONFLICTS OF LAWS.

18. The parties hereby submit to the jurisdiction of and venue in the federal courts located in the City of St. Louis, Missouri in connection with any dispute related to this Agreement, any transaction contemplated hereby, or any other matter contemplated hereby.

19. The Company acknowledges and agrees that (i) the purchase and sale of the Shares pursuant to this Agreement, including the determination of the public offering price of the Shares and any related discounts and commissions, 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 or its respective stockholders, creditors, employees or any other party, (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 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.

20. 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.

21. This 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.

22. The Company and each of the Underwriters hereby irrevocably waives, to the fullest extent permitted by applicable law, any and all right to trial by jury in any legal proceeding arising out of or relating to this Agreement or the transactions contemplated hereby.

23. The language used in this Agreement will be deemed to be the language chosen by the parties to express their mutual intent, and no rules of strict construction will be applied against any party.

24. Terms for which meanings are defined in this Agreement shall apply equally to the singular and plural forms of the terms defined. Whenever the context may require, any pronoun shall include the corresponding masculine and feminine forms. The term “including,” whenever used in any provision of this Agreement, means including but without limiting the generality of any description preceding or succeeding such term. Each reference to a person or entity shall include a reference to the successors and assigns of such person or entity.

[signatures appear on the following pages]

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 will become a binding agreement among the Company and the Underwriters.


Very truly yours, SOUTHWEST BANCORP, INC.
By:	/s/ Xxxx Xxxxx
	Name:	Xxxx Xxxxx
	Title:	President and Chief Executive Officer

Accepted as of the date hereof:

XXXXXX, XXXXXXXX & COMPANY, INCORPORATED


By:		/s/ Xxxx X. Xxxx Name: Xxxx X. Xxxx
		Title: Managing Director

XXXXXXXX INC.

By:		/s/ Xxxxxx Xxxxx Name: Xxxxxx Xxxxx
		Title: Senior Vice President

For itself and as Representatives of the other Underwriters named in Schedule I hereto

SCHEDULE I


	Number of Firm Shares
Underwriter	to be Purchased
Xxxxxx, Xxxxxxxx & Company, Incorporated		3,000,000
Xxxxxxxx Inc.		1,000,000

Total:		4,000,000

SCHEDULE II

Free Writing Prospectus

Press Release dated April 26, 2010

EXHIBIT A

OPINION OF COUNSEL TO THE COMPANY

(i) The Company has been duly incorporated and is validly existing as a corporation in good standing under the laws of the State of Oklahoma, and is duly registered as a bank holding company under the BHC Act, with power and authority (corporate and other) to own, lease and operate its properties and conduct its business as described in the Pricing Prospectus, the Pricing Disclosure Package and the Prospectus and to enter into and perform its obligations under the Agreement, and 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, except where the failure so to qualify or be in good standing would not have a material adverse effect on the Company and the Banks, considered as one enterprise;

(ii) Each Bank has been duly incorporated (or organized) and is validly existing as a corporation (or other organization) in good standing under the laws of the jurisdiction of its incorporation (or other organization), with power and authority to own, lease and operate its properties and conduct its business as described in the Pricing Prospectus, the Pricing Disclosure Package and the Prospectus and has been duly qualified as a foreign corporation (or other organization) for the transaction of business and is in good standing under the laws of each other jurisdiction in which its owns or leases properties or conducts any business so as to require such qualification, except where the failure so to qualify or be in good standing would not have a material adverse effect on the Company and the Bank; all of the issued and outstanding capital stock (or other ownership interests) of each Bank has been duly and validly authorized and issued, is fully paid and non-assessable and is owned by the Company, free and clear of any security interest, mortgage, pledge, lien, encumbrance, claim or equity;

(iii) The Company has an authorized capitalization as set forth in the Pricing Prospectus, the Pricing Disclosure Package and the Prospectus and all of the issued and outstanding shares of capital stock of the Company have been duly and validly authorized and issued, are fully paid and non-assessable and conform to the descriptions thereof contained in the Pricing Prospectus, the Pricing Disclosure Package and the Prospectus; and none of the issued and outstanding shares of capital stock of the Company are subject to any preemptive or similar rights;

(iv) The Shares have been duly and validly authorized and, when issued and delivered to and paid for by the Underwriters in accordance with the terms of the Agreement, will be duly and validly issued and fully paid and non-assessable and will conform to the descriptions thereof contained in the Pricing Prospectus, the Pricing Disclosure Package and the Prospectus; and the issuance of such Shares is not subject to any preemptive or similar rights;

(v) The Agreement has been duly authorized, executed and delivered by the Company;

(vi) The issue and sale of the Shares, the execution of the Agreement by the Company and the compliance by the Company with all of the provisions of the Agreement and the consummation of the transactions 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, any indenture, mortgage, deed of trust, loan agreement or other agreement or instrument known to such counsel after reasonable investigation to which the Company or any of the Banks is a party or by which the Company or any of the Banks is bound or to which any of the property or assets of the Company or any of the Banks is subject, nor will such action result in any violation of the provisions of the certificate or articles of incorporation or by-laws, (or other organization documents) of the Company or any of the Banks or any statute or any order, rule or regulation of any court or governmental agency or body known to such counsel after

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reasonable investigation having jurisdiction over the Company or any of the Banks or any of their properties; and no consent, approval, authorization, order, registration or qualification of or with any such court or governmental agency or body is required for the issue and sale of the Shares or the consummation by the Company of the transactions contemplated by the Agreement, except the registration under the Securities Act of the Shares and such consents, approvals, authorizations, registrations or qualifications as may be required under state securities or Blue Sky laws in connection with the purchase and distribution of the Shares by the Underwriters;

(vii) To such counsel’s knowledge after reasonable investigation, neither the Company nor any of the Banks is (1) in violation of its certificate or articles of incorporation or bylaws (or other organization documents), or (2) in violation of any law, ordinance, administrative or governmental rule or regulation applicable to the Company or any of the Banks, or (3) in violation of any decree of any court or governmental agency or body having jurisdiction over the Company or any of the Banks, or (4) in default in the performance of any obligation, agreement or condition contained in any bond, debenture, note or any other evidence of indebtedness or in any agreement, indenture, lease or other instrument to which the Company or any of the Banks is a party or by which any of them or any of their respective properties may be bound, except, in the case of clauses (2), (3) and (4), where any such violation or default, individually or in the aggregate, would not have a material adverse effect on the general affairs, business, prospects, management, financial position, shareholders’ equity or results of operations of the Company and the Banks, considered as one enterprise;

(viii) Other than as set forth in the Pricing Prospectus or the Pricing Disclosure Package, to such counsel’s knowledge after reasonable investigation, there are no legal or governmental proceedings pending to which the Company or any of the Banks is or could be a party or of which any property of the Company or any of the Banks is or could be the subject which, if determined adversely to the Company or the Bank, individually or in the aggregate, would have or may reasonably be expected to have a material adverse effect on the general affairs, business, prospects, management, financial position, shareholders’ equity or results of operations of the Company and the Banks, considered as one enterprise, or would prevent or impair the consummation of the transactions contemplated by the Agreement, or which are required to be described in the Registration Statement, the Pricing Prospectus, the Pricing Disclosure Package or the Prospectus; and, to such counsel’s knowledge after reasonable investigation, no such proceedings are threatened or contemplated by governmental authorities or others;

(ix) To such counsel’s knowledge after reasonable investigation, the Company and the Banks are operating in all material respects with the terms, provisions and conditions of all Permits issued by the appropriate federal or state regulatory agencies or bodies necessary to conduct the businesses now operated by them; to such counsel’s knowledge after reasonable investigation, the Company and the Banks are in compliance with the terms and conditions of all such Permits and all of the Permits are valid and in full force and effect, except, in each case, where the failure so to comply or where the invalidity of such Permits or the failure of such Permits to be in full force and effect, individually or in the aggregate, would not have a material adverse effect on the general affairs, business, prospects, management, financial position, shareholders’ equity or results of operations of the Company and the Banks, considered as one enterprise;

(x) The Company is not and, after giving effect to the offering and sale of the Shares as contemplated herein and the application of the net proceeds therefrom as described in the Pricing Prospectus, the Pricing Disclosure Package and the Prospectus, will not be an “investment company,” as such term is defined in the Investment Company Act;

(xi) The information in the Pricing Prospectus, the Pricing Disclosure Package and the Prospectus under the captions “Risk Factors,” “Description of Securities We May Offer,” and “Description

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of Outstanding Capital Purchase Program Securities,” and the information in the Company’s annual report on Form 10-K for the year ended December 31, 2009 identified therein as being responsive to Items 3, 10, 11, 12 and 13 of such Form 10-K and the information in the Company’s definitive Proxy Statement dated March 16, 2010 under the captions “Board Meetings and Committees”, “Director Compensation” and “Executive Compensation,” insofar as it constitutes matters of law, summaries of legal matters or documents, summaries of the Company’s charter or articles of incorporation and by-laws or legal proceedings, or legal conclusions is correct in all material respects;

(xii) Each of the Registration Statement, the Pricing Prospectus, the Pricing Disclosure Package and the Prospectus and any amendments or supplements thereto (other than the financial statements or other financial data included therein or omitted therefrom, as to which no opinion is expressed) comply as to form in all material respects with the requirements of the Securities Act and the Rules and Regulations as of their respective dates of effectiveness or issuance, and to such counsel’s knowledge after reasonable investigation there is no amendment of, or any contracts or other documents required to be filed as an exhibit to, the Registration Statement, the Pricing Prospectus, the Pricing Disclosure Package or the Prospectus which has not been filed as required. Subject to the information contained in the Company’s Current Report on Form 8-K filed on April 13, 2010, the Company’s Annual Report on Form 10-K, Proxy Statement, Quarterly Reports on Form 10-Q and Current Reports on Form 8-K incorporated by reference in the Registration Statement and the Prospectus (other than the financial statements or other financial data included therein or omitted therefrom, as to which no opinion is expressed) comply as to form in all material respects with the requirements of the Exchange Act and the rules and regulations thereunder as of their respective dates of effectiveness or filing;

(xiii) The Registration Statement, including any Rule 462(b) Registration Statement, has been declared effective under the Securities Act; any required filing of the Prospectus pursuant to Rule 424(b) under the Securities Act has been made in the manner and within the time period required by Rule 424(b); all material required to be filed by the Company pursuant to Rule 433(d) under the Securities Act shall have been filed with the Commission within the applicable time period prescribed for such filing by Rule 433 under the Securities Act; and to such counsel’s knowledge after reasonable investigation, no stop order suspending the effectiveness or use of the Registration Statement, the Prospectus or any Issuer Free Writing Prospectus has been issued under the Securities Act and no proceedings for that purpose have been instituted or are pending or threatened by the Commission;

(xiv) The Registration Statement, the Pricing Prospectus, the Pricing Disclosure Package and the Prospectus and any further amendments and supplements thereto made by the Company prior to such Closing Date or Option Closing Date, as the case may be (other than the financial statements, related schedules and other financial data therein, as to which such counsel need express no opinion), comply as to form in all material respects with the requirements of the Securities Act and the Rules and Regulations; and such counsel does not know of any amendment to the Registration Statement, the Pricing Prospectus, the Pricing Disclosure Package or the Prospectus required to be filed or of any contracts or other documents of a character required to be filed as an exhibit to the Registration Statement or required to be described in the Registration Statement or the Prospectus which are not filed or described as required;

In rendering such opinion, such counsel may rely as to matters of fact (but not as to legal conclusions), to the extent such counsel deems proper on certificates of responsible officers of the Company and public officials. Such opinion shall not state that it is to be governed or qualified by, or that it is otherwise subject to, any treatise, written policy or other document relating to legal opinions, including, without limitation, the Legal Opinion Accord of the ABA Section of Business Law (1991).

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In addition, Xxxxx X. Xxxxx, III counsel to the Company shall state that, although such counsel is not passing upon and does not assume any responsibility for nor has such counsel independently verified, the accuracy, completeness or fairness of the statements contained in the Registration Statement, the Pricing Prospectus, the Pricing Disclosure Package or the Prospectus, except to the extent set forth in opinions (iii), (iv) and (xv) above, in connection with the preparation of the Registration Statement, the Pricing Prospectus, the Pricing Disclosure Package and the Prospectus, such counsel has participated in conferences with representatives and counsel of the Representatives and with certain officers and employees of, and counsel and independent certified public accountants for, the Company, at which conferences the contents of the Registration Statement, the Prospectus and related matters were discussed, and such counsel advises the Representatives that nothing has come to such counsel’s attention that would lead such counsel to believe that, as of its effective date, the Registration Statement or any further amendment thereto made by the Company prior to such Closing Date or Option Closing Date, as the case may be (other than the financial statements, related schedules and other financial data therein, as to which such counsel need express no opinion), contained an untrue statement of a material fact required to be stated therein or necessary to make the statements therein not misleading or that, as of its date, the Prospectus or any further amendment or supplement thereto made by the Company prior to such Closing Date or Option Closing Date, as the case may be (other than the financial statements, related schedules and other financial data therein, as to which such counsel need express no opinion) contained an untrue statement of a material fact or omitted to state a material fact necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading or that, as of the Applicable Time, such Closing Date or Option Closing Date, as the case may be, any of the Registration Statement, the Pricing Prospectus, the Pricing Disclosure Package or the Prospectus or any further amendment or supplement thereto made by the Company prior to the Applicable Time, such Closing Date or Option Closing Date, as the case may be (other than the financial statements, related schedules and other financial data therein, as to which such counsel need express no opinion) contains an untrue statement of a material fact or omits to state a material fact necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading.

In rendering such opinion, such counsel may rely as to matters of fact (but not as to legal conclusions), to the extent they deem proper on certificates of responsible officers of the Company and public officials. Such opinion shall not state that it is to be governed or qualified by, or that it is otherwise subject to, any treatise, written policy or other document relating to legal opinions, including, without limitation, the Legal Opinion Accord of the ABA Section of Business Law (1991).

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EXHIBIT B

LOCK-UP AGREEMENT

SOUTHWEST BANCORP, INC.
000 Xxxxx Xxxx Xxxxxx
Xxxxxxxxxx, Xxxxxxxx 00000

XXXXXX, XXXXXXXX & COMPANY, INCORPORATED
     Xxxxxx, Xxxxxxxx & Company, Incorporated
     000 Xxxxx Xxxxxxxx
     Xx. Xxxxx, Xxxxxxxx 00000

Ladies and Gentlemen:

The undersigned refers to the proposed Underwriting Agreement (the “Underwriting Agreement”) among Southwest Bancorp, Inc., an Oklahoma corporation (the “Company”) and the several underwriters named therein (the “Underwriters”). As an inducement to the Underwriters to execute the Underwriting Agreement in connection with the proposed public offering of shares of the Company’s common stock, par value $1.00 per share (“Common Stock”), pursuant to a Registration Statement on Form S-3, the undersigned hereby agrees that from the date hereof and until ninety (90) days after the public offering date set forth on the final prospectus used to sell the Common Stock (the “Public Offering Date”) pursuant to the Underwriting Agreement (such 90-day period being referred to herein as the “Lock-Up Period”), to which you are or expect to become parties, the undersigned will not (and will cause any spouse or immediate family member of the spouse or the undersigned living in the undersigned’s household, any partnership, corporation or other entity within the undersigned’s control, and, to the extent the undersigned has power, any trustee of any trust that holds Common Stock or other securities of the Company for the benefit of the undersigned or such spouse or family member not to) offer, sell, contract to sell (including any short sale), pledge, hypothecate, establish an open “put equivalent position” within the meaning of Rule 16a-1(h) under the Securities Exchange Act of 1934, as amended, grant any option, right or warrant for the sale of, purchase any option or contract to sell, sell any option or contract to purchase, or otherwise encumber, dispose of or transfer, or grant any rights with respect to, directly or indirectly, any shares of Common Stock or securities convertible into or exchangeable or exercisable for any shares of Common Stock, enter into a transaction which would have the same effect, or enter into any swap, hedge or other arrangement that transfers, in whole or in part, any of the economic consequences of ownership of the Common Stock, whether any such aforementioned transaction is to be settled by delivery of the Common Stock or such other securities, in cash or otherwise, or publicly disclose the intention to make any such offer, sale, pledge or disposition, or to enter into any such transaction, swap, hedge or other arrangement, without, in each case, the prior written consent of Xxxxxx, Xxxxxxxx & Company, Incorporated (“Xxxxxx Xxxxxxxx”), which consent may be withheld in Xxxxxx Xxxxxxxx’ sole discretion; provided, however, that if (i) during the last 17 days of the initial Lock-Up Period, the Company releases earnings results or material news or a material event relating to the Company occurs or (ii) prior to the expiration of the initial Lock-Up Period, the Company announces that it will release earnings results during the 16-day period beginning on the last day of the initial Lock-Up Period, then in each case the Lock-Up Period will be automatically extended until the expiration of the 18-day period beginning on the date of release of the earnings results or the occurrence of the material news or material event, as applicable, unless Xxxxxx Xxxxxxxx waives, in writing, such extension.

The undersigned hereby acknowledges and agrees that written notice of any extension of the Lock-Up Period pursuant to the previous paragraph will be delivered by Xxxxxx Xxxxxxxx to the Company (in accordance with Section 15 of the Underwriting Agreement) and that any such notice properly delivered will be deemed to have been given to, and received by, the undersigned. The undersigned further agrees that, prior to engaging in any transaction or taking any other action that is subject to the

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terms of this Agreement during the period from the date of this Agreement to and including the 34th day following the expiration of the initial Lock-Up Period, it will give notice thereof to Xxxxxx Xxxxxxxx and will not consummate such transaction or take any such action unless it has received written confirmation from Xxxxxx Xxxxxxxx that the Lock-Up Period (as may have been extended pursuant to the previous paragraph) has expired.

The foregoing restrictions shall not apply to bona fide gifts by the undersigned, provided that (a) each resulting transferee of the Company’s securities executes and delivers to Xxxxxx Xxxxxxxx an agreement satisfactory to Xxxxxx Xxxxxxxx certifying that such transferee is bound by the terms of this Agreement and has been in compliance with the terms hereof since the date first above written as if it had been an original party hereto and (b) to the extent any interest in the Company’s securities is retained by the undersigned (or such spouse or family member), such securities shall remain subject to the restrictions contained in this Agreement.

In addition, the undersigned agrees that, during the period commencing on the date hereof and ending ninety (90) days after the Public Offering Date, without the prior written consent of Xxxxxx Xxxxxxxx (which consent may be withheld in its sole discretion): (a) the undersigned will not request, make any demand for or exercise any right with respect to, the registration of any Common Stock or any security convertible into or exercisable or exchangeable for Common Stock and (b) the undersigned waives any and all notice requirements and rights with respect to the registration of any such security pursuant to any agreement, understanding or otherwise to which the undersigned is a party.

Any Common Stock received upon exercise of options granted to the undersigned will also be subject to this Agreement. Any Common Stock acquired by the undersigned in the open market on or after the Public Offering Date (pursuant to a “friends and family” or directed share program or otherwise) will not be subject to this Agreement. A transfer of Common Stock to a family member or a trust for the benefit of the undersigned or a family member may be made, provided the transferee agrees in writing prior to such transfer to be bound by the terms of this Agreement as if it were a party hereto.

In furtherance of the foregoing, the Company and its transfer agent and registrar are hereby authorized to (a) decline to make any transfer of shares of Common Stock if such transfer would constitute a violation or breach of this Agreement and (b) place legends and stop transfer instructions on any such shares of Common Stock owned or beneficially owned by the undersigned.

This Agreement is irrevocable and shall be binding on the undersigned and the successors, heirs, personal representatives and assigns of the undersigned. This Agreement shall be governed by and construed in accordance with the laws of the State of Missouri, without regard to choice of law rules. This Agreement shall lapse and become null and void if the proposed public offering of the Common Stock shall not have occurred on or before May 7, 2010.


		Very truly yours,


		Printed Name:
		Date:

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4,000,000 Shares SOUTHWEST BANCORP, INC. Common Stock UNDERWRITING AGREEMENT

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