SOUTHWEST BANCORP INC
PRE 14A, 1999-04-06
SAVINGS INSTITUTION, FEDERALLY CHARTERED
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<PAGE>
 

                                 UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549

                           SCHEDULE 14A INFORMATION

          Proxy Statement Pursuant to Section 14(a) of the Securities
                    Exchange Act of 1934 (Amendment No.  )
        
Filed by the Registrant [X]

Filed by a Party other than the Registrant [_] 

Check the appropriate box:

[X]  Preliminary Proxy Statement         [_]  CONFIDENTIAL, FOR USE OF THE
                                              COMMISSION ONLY (AS PERMITTED BY
                                              RULE 14A-6(E)(2))

[_]  Definitive Proxy Statement 

[_]  Definitive Additional Materials 

[_]  Soliciting Material Pursuant to Section 240.14a-11(c) or Section 240.14a-12


                            SOUTHWEST BANCORP, INC.
               (Name of Registrant as Specified In Its Charter)


   (Name of Person(s) Filing Proxy Statement, if other than the Registrant)

   
Payment of Filing Fee (Check the appropriate box):

[X]  No fee required

[_]  Fee computed on table below per Exchange Act Rules 14a-6(i)(4) and 0-11.

   
     (1) Title of each class of securities to which transaction applies:

     -------------------------------------------------------------------------


     (2) Aggregate number of securities to which transaction applies:

     -------------------------------------------------------------------------


     (3) Per unit price or other underlying value of transaction computed
         pursuant to Exchange Act Rule 0-11 (Set forth the amount on which
         the filing fee is calculated and state how it was determined):

     -------------------------------------------------------------------------
      

     (4) Proposed maximum aggregate value of transaction:

     -------------------------------------------------------------------------


     (5) Total fee paid:

     -------------------------------------------------------------------------

[_]  Fee paid previously with preliminary materials.
     
[_]  Check box if any part of the fee is offset as provided by Exchange
     Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee
     was paid previously. Identify the previous filing by registration statement
     number, or the Form or Schedule and the date of its filing.
     
     (1) Amount Previously Paid:
 
  
     (2) Form, Schedule or Registration Statement No.:

  
     (3) Filing Party:
      
  
     (4) Date Filed:

  


<PAGE>
 
                            SOUTHWEST BANCORP, INC.





                                April 17, 1999



Dear Fellow Shareholder:

         We invite you to attend our 1999 Annual Meeting of the Shareholders to
be held in the Auditorium, Room 215, of the Stillwater Public Library, 1107
South Duck Street, Stillwater, Oklahoma on Thursday, May 27, 1999 at 11:00 a.m.,
Central Time.

         We are proud of our corporate performance in 1998 and will discuss
highlights of the past year and the first quarter of 1999 at our Annual Meeting.
The 1998 results are presented in detail in the enclosed Annual Report.

         The Annual Meeting has been called for the election of directors and to
consider any other matters as may properly come before the Annual Meeting or any
adjournments. Directors and officers of the Company, as well as representatives
of Deloitte & Touche LLP, the Company's independent auditors, will be present to
respond to any questions the shareholders may have.

         Your vote on the proxy proposals may be cast by telephone or the
enclosed proxy card. Please use whichever method is easier for you, but please
do cast your vote - it is important.

         Thank you for investing in Southwest.

         You also are invited to a reception and dinner on the evening of
Wednesday, May 26, 1999, at 6:30 p.m. in Stillwater, Oklahoma. If you plan to
attend this reception and dinner please fill out the enclosed card and return it
to us by May 20, 1999 so we may make the proper arrangements.

                                             Sincerely,

                                             /s/ Robert L. McCormick

                                             Robert L. McCormick
                                             Chairman of the Board of Directors
<PAGE>
 
                            SOUTHWEST BANCORP, INC.
                             608 South Main Street
                          Stillwater, Oklahoma 74074
                                (405) 372-2230

                           NOTICE OF ANNUAL MEETING
                                 May 27, 1999

         The Annual Meeting of Shareholders of Southwest Bancorp, Inc.
("Southwest"), will be held in the Auditorium, Room 215, of the Stillwater
Public Library, 1107 South Duck Street, Stillwater, Oklahoma at 11:00 a.m.,
Central Time, on Thursday, May 27, 1999.

         The Annual Meeting is for the purpose of considering and acting upon:

         1.       The election of three directors of the Company;
         2.       An amendment to the Certificate of Incorporation to increase
                  the number of authorized shares of common stock to 20,000,000;
         3.       The approval of the Southwest Bancorp 1999 Stock Option Plan;
                  and
         4.       The transaction of such other matters as may properly come
                  before the Annual Meeting or any adjournments thereof.

         Your Board of Directors recommends a vote "in favor of" each of these
proposals. The Board is not aware of any other business to come before the
Annual Meeting.

         Only shareholders of record at the close of business on April 6, 1999,
will be entitled to vote at the Annual Meeting and any adjournments or
postponements. A Proxy Card and a Proxy Statement for the Annual Meeting are
enclosed. Whether or not you attend the meeting in person, it is important that
your Southwest shares be represented and voted. You may vote by telephone
(1-800-_________) or by completing, signing and dating your proxy card, and
returning it as soon as possible in the postage-paid envelope. You may change
your proxy later or vote in person at the meeting, if you wish.

         A complete list of shareholders entitled to vote at the Annual Meeting
will be open for examination by any shareholder for any purpose germane to the
Annual Meeting during ordinary business hours at the Company's main office
during the ten days prior to the Annual Meeting.

         The proxy statement, voting instruction card and Southwest's 1998
Annual Report are being distributed on or about April _____, 1999.

                                              BY ORDER OF THE BOARD OF DIRECTORS

                                              /s/ Deborah T. Bradley

                                              DEBORAH T. BRADLEY
Stillwater, Oklahoma                          SECRETARY
April _____, 1999
<PAGE>
 
                         P R O X Y  S T A T E M E N T

                      Q U E S T I O N S AND A N S W E R S


Q:       What am I voting on?
A:       You are voting on:

         (1) The re-election of the following three directors, each for a
             three-year term: J. Berry Harrison, Erd M. Johnson and Robert
             L. McCormick (see page ____);
         (2) An amendment to the Certificate of Incorporation to increase
             the number of authorized shares of common stock to 20,000,000
             (see page ____); and
         (3) The approval of the Southwest Bancorp 1999 Stock Option Plan
             (see page ____).

- --------------------------------------------------------------------------------

Q:       Who is entitled to vote at the Annual Meeting?
A:       Shareholders of Southwest's common stock as of the close of business on
         April 6, 1999 (the Record Date) are entitled to vote at the meeting.

- --------------------------------------------------------------------------------

Q:       How do I vote?
A:       You may vote by telephone (1-800-________) or by completing, signing
         and dating the proxy card, and returning it in the enclosed,
         postage-paid envelope. If you return your signed proxy card but do not
         indicate your voting preference, your card will be voted in favor of
         the re-election of all three directors, for approval of the amendment
         to increase authorized shares, and for approval of Southwest's 1999
         Stock Option Plan. You have the right to revoke your proxy any time
         before the Annual Meeting, and shareholders who attend the meeting may
         withdraw their proxies and vote in person if they wish.

- --------------------------------------------------------------------------------

Q:       Is my vote confidential?
A:       Yes, only the inspectors of election and a limited number of employees
         associated with processing the votes will know how you cast your vote.

- --------------------------------------------------------------------------------

Q:       Who will count the votes?
A:       Harris Trust and Savings Bank, Southwest's transfer agent, will
         tabulate the votes.

- --------------------------------------------------------------------------------

Q:       What should I do if I receive more than one proxy card?
A:       If you receive more than one proxy card, it indicates that you own
         shares in more than one account, or your shares are registered in
         various names. You should vote all proxy cards you receive, by either
         calling the voting number (1-800-_______) or completing, signing,
         dating and returning each proxy card in the enclosed, postage paid
         envelope.

- --------------------------------------------------------------------------------

                                       1
<PAGE>
 
Q:       What constitutes a quorum at the Annual Meeting?
A:       On the Record Date, there were ________ shares of Southwest common
         stock issued and outstanding. Each share is entitled to one vote on all
         matters voted on at the Annual Meeting. A majority of the outstanding
         shares, present or represented by proxy, will be a quorum for the
         Annual Meeting. If you submit a properly executed proxy card or cast
         your vote by telephone, you will be considered part of the quorum.
         Abstentions and shares held for you by your broker or nominee (broker
         shares) that are voted on any matter are included in the quorum. Broker
         shares that are not voted on any matter are not included in the quorum
         and are not included in determining the number of votes cast in the
         election of directors.

- --------------------------------------------------------------------------------

Q:       Who may attend the Annual Meeting?
A:       All shareholders as of the Record Date may attend, although seating is
         limited.

- --------------------------------------------------------------------------------

Q:       What percentage of Southwest stock did directors and executive officers
         of Southwest own on the Record Date?
A:       Together, they owned approximately ______ of Southwest issued and
         outstanding common stock.

- --------------------------------------------------------------------------------

Q:       Who pays for this proxy solicitation and how will solicitation occur?
A:       Southwest's Board of Directors is soliciting this proxy, and Southwest
         will pay the cost of the solicitation. In addition to the use of the
         mail, employees of Southwest may solicit proxies personally or by
         telephone, fax or electronic mail, without additional compensation.
         Banks, brokerage houses and other nominees and fiduciaries are
         requested to forward the proxy material to beneficial owners of
         Southwest stock and to obtain authorization to execute proxies on
         behalf of the beneficial owners. Upon request, Southwest will reimburse
         these parties for their reasonable expenses in forwarding proxy
         material to beneficial owners.

- --------------------------------------------------------------------------------


                      PROPOSAL I -- ELECTION OF DIRECTORS

         Your Board of Directors is currently composed of thirteen members. All
of Southwest's directors also serve as directors of The Stillwater National Bank
and Trust Company, Southwest's banking subsidiary. Directors of the Company are
divided into three classes and are elected for terms of three years and until
their successors are elected and qualified. At the Annual Meeting, three
directors will be elected for terms expiring at the 2002 Annual Meeting.

         The Board of Directors has nominated for re-election J. Berry Harrison,
Erd M. Johnson, and Robert L. McCormick, all of whom are currently directors,
each to serve for a term of three years and until his successor is elected and
qualified. Each nominee must be elected by a plurality of shares voted in this
election. The individuals named as proxies on your proxy card will vote for the
election of each nominee unless you withhold authorization.

                                       2
<PAGE>
 
         Each shareholder voting in the election of directors is entitled to
cumulate his or her votes by multiplying the number of shares of common stock
owned of record by the shareholder on the Record Date by the number of directors
to be elected. Each shareholder is then entitled to cast his or her total
cumulated votes for one nominee or distribute his or her votes among any number
of the nominees being voted on at the Annual Meeting. Shareholders may not
cumulate their votes on the form of proxy solicited by the Board of Directors.
In order to cumulate votes, shareholders must attend the meeting and vote in
person or make arrangements with their own proxies. Unless otherwise specified
in the proxy, however, the right is reserved, in the sole discretion of the
Board of Directors, to vote cumulatively, and to distribute votes among some or
all of the nominees of the Board of Directors in a manner other than equally so
as to elect as directors the maximum possible number of such nominees.

         Each nominee has agreed to serve a three-year term, if elected. If any
nominee is unable to stand for re-election at this Annual Meeting, the Board may
reduce its size or nominate an alternate candidate, and the proxies will be
voted for the alternate candidate.

         Your Board recommends a vote FOR these directors.

                                       3
<PAGE>
 
                               DIRECTOR NOMINEES

                             Term Expiring in 2002

J. Berry Harrison                                            Director Since 1991

         Mr. Harrison, age 60, is currently an Oklahoma State Senator, and has
been a rancher and farmer in Fairfax, Oklahoma since 1962. Mr. Harrison serves
as Conservation District Director of Osage County, President of the Oklahoma
Association of Conservation Districts, and is a member of many other civic
groups in his Senate District. Joyce P. Berry is his aunt, and Robert B. Rodgers
and James E. Berry II are his cousins.

Erd M. Johnson                                               Director Since 1988

         Mr. Johnson, age 69, is Operating Partner of Johnson Oil Partnership,
Midland, Texas. Mr. Johnson is a retired Petroleum Engineer and was Operating
Partner of Johnson Ranch, Fairfax, Oklahoma before its liquidation in 1997. Mr.
Johnson served from 1984-87 as a director of Beefmaster Breeders Universal, and
from 1987-89 as its Treasurer. Mr. Johnson is a former Trustee and Treasurer of
Trinity School of Midland, Texas and a former director and president of The
Racquet Club, Midland, Texas.

Robert L. McCormick                                          Director Since 1981

         Mr. McCormick, age 64, is Chairman of the Board of Directors of the
Company and the Bank, and has been a director of the Company since its inception
in 1981. He served as Chief Executive Officer of the Company from 1981 until
December 31, 1998, and as President, Chief Executive Officer and a director of
the Bank from 1970 until December 31, 1998. He is a Regent, Oklahoma State
Regents for Higher Education. Mr. McCormick has served as President of the
Independent Bankers Association of America; President of the Independent Bankers
Association of Oklahoma; President of the Board of Directors Stillwater Chamber
of Commerce; Chairman of the State Chamber, Oklahoma's Association of Business
and Industry; Chairman and President of the Board of Directors for the Oklahoma
Academy for State Goals; and Chairman of the Board of Trustees of the Oklahoma
State University Foundation.

                        DIRECTORS CONTINUING IN OFFICE

                             Term Expiring in 2001

Thomas D. Berry                                              Director Since 1981

         Mr. Berry, age 55, has been a director of the Company since its
inception in 1981 and has been a director of the Bank since 1978. He is involved
in oil and gas exploration in North Central Oklahoma, and is an Auctioneer and
Real Estate Broker in Stillwater, Oklahoma.

                                       4
<PAGE>
 
Rick J. Green                                                Director Since 1998

         Mr. Green, age 51, was appointed the Chief Executive Officer of the
Company and the Bank effective January 1999. Mr. Green previously served as
Chief Operating Officer, President of the Central Oklahoma division of the Bank,
and Executive Vice President of the Bank. He is a member of the Oklahoma City
and Edmond Chambers of Commerce and has served as Chair/Ambassador of the
Stillwater Chamber of Commerce, on the Oklahoma State University Alumni
Association Homecoming and Honor Students Committees, as Chairman of the Payne
County Youth Services, as Co-Chairman of the United Way of Stillwater Fund Drive
and as a member of the Advisory Board of the Oklahoma State University Technical
Institute. He is a member of the Commercial Real Estate Association of Oklahoma
City, the Oklahoma and Oklahoma City Homebuilders Associations, and past member
of the Stillwater Medical Center Committee on Physician Recruitment. Mr. Green
is also a member of Leadership Stillwater and Leadership Oklahoma City.

David P. Lambert                                             Director Since 1981

         Mr. Lambert, age 59, has been a director of the Company since its
inception. Mr. Lambert has served as President and Chief Executive Officer of
the Lambert Construction Company, Stillwater, Oklahoma since 1974, and is a
Trustee of Stillwater Industrial Foundation, a Trustee of the Oklahoma
Construction Advancement Foundation, and a Director of the Stillwater Chamber of
Commerce.

Linford R. Pitts                                             Director Since 1981

         Mr. Pitts, age 61, has been a director of the Company since its
inception. He has been a director of the Bank since 1977. He is President of
Stillwater Transfer & Storage Company in Stillwater, Oklahoma, and invests in
real estate and in oil and gas properties. Mr. Pitts is a member of the Past
President's Council of the Stillwater Chamber of Commerce.

Stanley R. White                                             Director Since 1998

         Mr. White, age 52, was appointed Chief Lending Officer in December
1995. Prior to this appointment, he had been President of the Stillwater
division of the Bank since 1991. Mr. White joined the Bank in 1974. He is a past
member and past Chairman of the Board of Trustees of the Stillwater Medical
Center, past Director of the Stillwater Public Education Foundation, the Judith
Karman Hospice, United Way, March of Dimes, and the Stillwater Rotary, and past
President of the Stillwater Chamber of Commerce and the Stillwater Industrial
Foundation. Mr. White also has served as Director of the Oklahoma State
University Alumni Association and the Oklahoma State Chamber of Commerce, past
Board Member of the Oklahoma Law Enforcement Retirement Board, and currently
serves as Director of the Oklahoma Medical Research Foundation, Director of
Leadership Oklahoma, Vice President of Leadership Oklahoma Alumni, past Chairman
and Trustee of the Board of Governors of the Oklahoma State University
Foundation, and is a Director of Oklahoma Academy for State Goals. Mr. White
also is past Chairman of the Oklahoma Bankers Association, and past Chairman of
the Oklahoma Bankers Association Government Relations Council. He is a member of
the American Bankers Association Government Relations Council and is Director of
the Texas Chapter and Senior Member of the Robert Morris Association.

                                       5
<PAGE>
 
                              Term Expiring in 2000

James E. Berry, II                                           Director Since 1998

         Mr. Berry, age 53, served as a director of the Company and the Bank
since being appointed to the Board of Directors in June 1998, following the
retirement of his father, George M. Berry, from the Board. Mr. Berry is the
owner of Shading Concepts, which manufactures and sells solarium draperies.

Joyce P. Berry                                               Director Since 1981

         Ms. Berry, age 76, has served as a director of the Company since its
inception in 1981. She has been a director of the Bank since 1978. Her principal
occupation is personal investments.

Joe Berry Cannon                                             Director Since 1981

         Mr. Cannon, age 62, has been a director of the Company since its
inception in 1981 and a director of the Bank since 1961. He is a Professor of
Management at Oral Roberts University School of Business in Tulsa, Oklahoma. Mr.
Cannon served as Chairman, President, Chief Executive Officer and Senior Trust
Officer of First National Bank and Trust Co. in Blackwell, Oklahoma from
1968-1991. He has been a member of the Kiwanis Club, a member of the Methodist
Church Board of Directors, and a member of the American and Oklahoma Bar
Associations.

Alfred L. Litchenburg                                        Director Since 1998

         Mr. Litchenburg, age 49, was elected a director by the Board of
Directors of the Company and the Bank in February 1998. He is Senior Vice
President and Director of Strategic Development for American Fidelity Assurance
Company, Oklahoma City, Oklahoma, and has served in various capacities with that
company since 1975. He also serves as Vice President of the Board for the
Variety Health Center and Group Chair for the Oklahoma City United Way, and is a
member of the Finance Committee of New Covenant United Methodist Church and
Leadership Oklahoma City. He is a Fellow of the Society of Actuaries and a
member of the American Academy of Actuaries.

Robert B. Rodgers                                            Director Since 1996

         Mr. Rodgers, age 45, has been a director of the Company and the Bank
since February 1996, and Vice Chairman of the Board since May 1998. Robert B.
Rodgers is president of Perry and Rodgers Motor Company in Pauls Valley,
Oklahoma, and is owner of Rapid Roberts Enterprises. He is director and former
President and Chairman of the Board of Directors of CDI II, a credit life
insurance company headquartered in Oklahoma City, Oklahoma. Mr. Rodgers also
serves on the Board of Directors and is Regional Vice President of the Oklahoma
Auto Dealers Association.

         Note: James B. Wise, MD, and Lee A. Wise, resigned from the Board of
Directors on March 25, 1999, after completion of the public offering of shares
of common stock owned by Dr. Wise and the estate of his father, Paul C. Wise.
Their service to Southwest is appreciated.

                                       6
<PAGE>
 
                         BOARD MEETINGS AND COMMITTEES

         Southwest's Board conducts its business through meetings of the Board
and of its committees. The Board meets monthly and may have additional special
meetings. The Board met twelve times during 1998. Each director attended at
least 75% of the total number of meetings of the Board and the committees on
which he or she served.

         The Audit Committee of the Board reviews Southwests' auditing,
accounting, credit, financial and regulatory reporting and internal control
functions. This committee also recommends the firm to be retained by Southwest
as its independent auditors. Only non-employee directors serve on this
committee. The committee met eight times in 1998. The Board has a standing Audit
Committee composed of Joyce P. Berry, J. Berry Harrison, David P. Lambert, and
Linford R. Pitts, Chairman.

         The Compensation Committee of the Board reviews Southwest's
compensation policies and employee benefit plans and programs, including their
establishment, modification, and administration. In addition, this committee
recommends compensation for Southwest's executive officers, determines
management incentive awards, to eligible officers, and recommends changes in
director compensation. During 1998, the committee also determined grants of
stock options to officers. All members of this committee are non-employee
directors. The committee met three times in 1998. Current members are Erd M.
Johnson, David P. Lambert, and Robert B. Rodgers, Chairman. In 1998, no
Southwest executive officer served as a member of the compensation committee of
another entity that had an executive officer who served as a Southwest director,
and no Southwest executive officer served as a director of another entity that
had an executive officer serving on Southwest's Compensation Committee.

         The Nominating Committee recommends persons for election as directors.
Prior to 1999, the full board fulfilled the functions of this committee. Current
members are David P. Lambert, Linford R. Pitts, and Robert B. Rodgers, Chairman.
The Board of will consider nominees recommended by shareholders, but has not
established any procedures for submission of such recommendations.

                             DIRECTOR COMPENSATION

         Directors of the Company receive fees of $1,000 for each regular
meeting of the Board attended and $300 per day for each committee meeting.

                                       7
<PAGE>
 
            COMMON STOCK OWNED BY DIRECTORS AND EXECUTIVE OFFICERS

         The shares of Southwest's common stock that were beneficially owned on
the Record Date by persons who were directors and officers on December 31, 1998,
are shown below.

                                   Amount and
                                    Nature of          Percentage
                                   Beneficial           of Shares
Name                             Ownership  (1)      Outstanding (2)
- ----                             --------------      ---------------

James E. Berry, II                    5,300                   *
Joyce P. Berry                      220,901  (3)              5.41%
Thomas D. Berry                      15,005                   *
Joe Berry Cannon                     44,625  (4)              1.09
Rick J. Green                        24,407  (5)              *
J. Berry Harrison                    35,392                   *
Erd M. Johnson                       61,588  (6)              1.51
David P. Lambert                     14,320  (7)              *
Alfred L. Litchenburg                   100  (8)              *
Robert L. McCormick                  95,000  (9)              2.30
Linford R. Pitts                      7,320                   *
Robert B. Rodgers                    15,593 (10)              *
Stanley R. White                     24,147 (11)              *
Lee A. Wise                             527 (12)              *
James B. Wise, MD                         0 (12)              *
Kerby E. Crowell                     22,625 (13)              *
All Directors and Executive
  Officers as a Group
  (23 persons)                      620,850 (14)             14.73%

- -----------------
*        Less than one percent of shares outstanding.
(1)      Beneficial ownership is defined by rules of the Securities and Exchange
         Commission, and includes shares that the person has or shares voting or
         investment power over and shares that the person has a right to acquire
         within 60 days from April 6, 1999. Unless otherwise indicated,
         ownership is direct and the named individual exercises sole voting and
         investment power over the shares listed as beneficially owned by such
         person. A decision to disclaim beneficial ownership is made by the
         individual, not Southwest.
(2)      In calculating the percentage ownership of each named individual and
         the group, the number of shares outstanding includes any shares that
         the person or the group has the right to acquire within 60 days of
         April 6, 1999.
(3)      Does not include shares held by her children as to which she disclaims
         beneficial ownership.
(4)      Excludes 18,270 shares beneficially owned by his wife, Beverly Cannon,
         as trustee and 800 shares held by his wife.
(5)      Includes 280 shares held jointly with his spouse and 2,127 shares held
         by his spouse. Includes 22,000 shares which Mr. Green has the right to
         acquire within 60 days of April 6, 1999 pursuant to the exercise of
         options issued under the 1994 Stock Option Plan.
(6)      Excludes 10 shares held by his wife, Ann W. Johnson. Includes 2,729
         shares held by Johnson Oil Partnership of which Mr. Johnson is a
         general partner.
(7)      Includes 7,000 shares held by his wife.
(8)      Excludes 404,475 shares (9.92%) owned by American Fidelity Corporation
         ("AFC") and its subsidiary, Security General Life Insurance Company.
         Mr. Litchenburg is an officer of American Fidelity Assurance Company,
         the principal subsidiary of AFC.
(9)      Includes 44,000 shares held by Robert L. McCormick, Jr. Trust and 9,000
         shares held by Peggy Anne McCormick Trust. Includes 42,000 shares which
         Mr. McCormick has the right to acquire within 60 days of April 6, 1999,
         upon the exercise of options issued under the 1994 Stock Option Plan.
(10)     Excludes any shares owned by his father, James W. Rodgers, Jr. and his
         mother, Sarah Jane Berry Rodgers.
(11)     Includes 20,000 shares which Mr. White has the right to acquire within
         60 days of April 6, 1999 pursuant to the exercise of options issued
         under the 1994 Stock Option Plan. Includes 170 shares held by his
         spouse.
(12)     Ms. Wise and Dr. Wise each resigned from the Board of Directors on
         March 25, 1999.
(13)     Includes 18,000 shares which Mr. Crowell has the right to acquire
         within 60 days of April 6, 1999 pursuant to the exercise of options
         issued under the 1994 Stock Option Plan.
(14)     Includes shares held by certain directors and executive officers as
         custodians under Uniform Transfers to Minors Acts, by their spouses and
         children, and for the benefit of certain directors and executive
         officers under individual retirement accounts ("IRAs") and living
         trusts. Includes 135,000 shares that executive officers have the right
         to acquire within 60 days of April 6, 1999, by exercise of options.

                                       8
<PAGE>
 
              OWNERS OF MORE THAN 5% OF SOUTHWEST'S COMMON STOCK

         Beneficially owners of more than 5% of the common stock are required to
file certain ownership reports under the federal securities laws. The following
table shows the common stock beneficially owned by all persons who have filed
these reports.

                                        Amount and Nature        Percentage
                                          of Beneficial           of Shares
Name                                      Ownership (1)          Outstanding
- ----                                      -------------          -----------


American Fidelity Corporation              404,575  (2)              9.92%

George M. Berry                            220,870  (3)              5.41

Joyce P. Berry                             220,901  (4)              5.41

Stillwater National Bank
  and Trust Company                        238,855  (5)              5.85

- --------------------
(1)      Beneficial ownership is defined by rules of the Securities and Exchange
         Commission, and includes shares that the person has or shares voting or
         investment power over. Unless otherwise indicated, ownership is direct
         and the named individual exercises sole voting and investment power
         over the shares listed as beneficially owned by such person. A decision
         to disclaim beneficial ownership is made by the individual, not
         Southwest.
(2)      American Fidelity Corporation ("AFC") is controlled by Cameron
         Enterprises, A Limited Partnership ("CELP").The general partners of
         CELP are Lynda L. Cameron, William M. Cameron, Theodore M. Elam, and,
         as trustees, certain officers of the Bank of Oklahoma, N.A. Includes
         shares owned by Security General Life Insurance Company ("SGLI"), a
         subsidiary of AFC. The address of AFC, SGLI, and CELP is 2000 Classen
         Center, Oklahoma City, Oklahoma 73106. Includes 100 shares owned by
         Alfred A. Lichtenburg, a director of the Company, who is an officer of
         American Fidelity Assurance Company, the principal subsidiary of AFC.
(3)      Includes 147,600 shares held by George M. Berry Revocable Inter Vivos
         Trust and 72,600 shares held by Monica B. Berry Trust. The address of
         Mr. Berry is 402 South Willis, Stillwater, Oklahoma 74074. Does not
         include shares held by his children as to which he disclaims beneficial
         ownership.
(4)      The address of Joyce P. Berry is 312 South Willis, Stillwater, Oklahoma
         74074. Does not include shares held by her children as to which she
         disclaims beneficial ownership.
(5)      Includes shares held in various trusts for which Stillwater National
         Bank and Trust Company acts as trustee and over which it has sole or
         shared power to dispose of the shares. Includes 147,600 shares held by
         the George M. Berry Revocable Inter Vivos Trust and 72,600 shares held
         by Monica B. Berry Trust. The address of Stillwater National Bank and
         Trust Company is 608 South Main Street, Stillwater, Oklahoma 74074.

                                       9
<PAGE>
 
                   EXECUTIVE COMPENSATION AND OTHER BENEFITS


         The following table summarizes compensation earned by or awarded to the
Company's Chief Executive Officer and the Company's four most highly compensated
executive officers whose aggregate annual salary and bonuses exceeded $100,000
during 1998 (the "Named Executive Officers").

<TABLE> 
<CAPTION> 

                                               Summary Compensation Table

                                                                          Long-Term Compensation
                                                                          ----------------------
                                                                            Awards       Payouts
                                                                            ------       -------
                               Annual Compensation (1)     Securities                    All Other
Name and                       -----------------------     Underlying          LTIP       Compen-
Principal Position             Year   Salary     Bonus   Options/SARs(2)   Payouts(3)     sation
- ------------------             ----   ------     -----   ---------------   ----------     ------
<S>                            <C>    <C>       <C>      <C>               <C>            <C>    
Robert L. McCormick            1998  $262,400   $25,000    $     --         $     --      $35,678  (4)
  Chairman of the Board        1997   254,750        --          --           43,970       24,872
                               1996   214,750        --          --           15,738       27,559
                                                       
Rick J. Green                  1998   142,000    10,000          --               --       21,923  (5)
  Chief Executive Officer      1997   130,460     5,654      10,000           17,588       12,681
                               1996   119,411     4,084          --           15,738       15,762
                                                       
Stanley R. White               1998   121,250        --          --               --       18,627  (6)
  Chief Lending Officer        1997   117,750     5,000          --           17,588       11,823
                               1996   113,250        --          --           15,738       14,284
                                                       
  Kerby E. Crowell             1998   111,400    10,000          --               --       18,096  (7)
  Executive Vice President     1997   105,400        --      10,000           17,588       10,056
  and Chief Financial Officer  1996   102,400        --          --           15,738       12,712
</TABLE> 

- -------------
(1)      The value of other annual compensation did not exceed the lesser of
         $50,000 or 10% of salary and bonus for any Named Executive Officer.
(2)      In each case, represents stock options granted under the Company's
         Stock Option Plan.
(3)      In each case, consists of payouts under the Company's Performance Unit
         Plan.
(4)      Consisted of $10,400 in directors' fees, $2,878 in dollar value of term
         life insurance premiums paid by the Company for the benefit of Mr.
         McCormick and $22,400 contributed to Mr. McCormick's account in the
         Profit Sharing Plan.
(5)      Consisted of $1,181 in dollar value of term life insurance premiums
         paid by the Company for the benefit of Mr. Green and $20,742
         contributed to Mr. Green's account in the Profit Sharing Plan.
(6)      Consisted of $1,181 in dollar value of term life insurance premiums
         paid by the Company for the benefit of Mr. White and $17,446
         contributed to Mr. White's account in the Profit Sharing Plan.
(7)      Consisted of $654 in dollar value of term life insurance premiums paid
         by the Company for the benefit of Mr. Crowell and $17,442 contributed
         to Mr. Crowell's account in the Profit Sharing Plan.

                             Option Grants in 1998

         No stock options were granted to Named Executive Officers in 1998.

                                       10
<PAGE>
 
                            Year-End Option Values

         The number and potential realizable value at the end of the year of
options held by each of the Named Executive Officers are shown below.
<TABLE> 
<CAPTION> 

                                                         Number of Securities             Value of Unexercised
                                                        Underlying Unexercised            In-the-Money Options
                                                          Options at Year-End                at Year-End (1)  
                        Shares Acquired      Value    ---------------------------     ----------------------------
Name                      on Exercise      Realized   Exercisable   Unexercisable     Exercisable    Unexercisable
- ----                      -----------      --------   -----------   -------------     ----------------------------
<S>                       <C>             <C>         <C>           <C>               <C>              <C>   
Robert L. McCormick               --       $ --         35,000           7,000        $485,625         $  97,128
Rick J. Green                     --         --         21,000          19,000         267,375           167,625
Stanley R. White                  --         --         19,000          11,000         263,625           152,625
Kerby E. Crowell                  --         --         16,000          14,000         194,000            82,250
</TABLE> 
- ------------------                
(1)      Calculated based on the product of: (a) the number of shares subject to
         options and (b) the difference between the fair market value of the
         underlying common stock at December 31, 1998, based on the closing sale
         price of the common stock on December 31, 1998 as reported on the
         Nasdaq National Market of $26.625 per share, and the exercise price of
         the options $12.75 to $26.75 per share.

         No options or stock appreciation rights ("SARs") were exercised by the
Named Executive Officers during 1998. No SARs were held by any Named Executive
Officer at year-end. No options or SARs held by any Named Executive Officer
repriced during the Company's last ten full years.

                            SEVERANCE ARRANGEMENTS

         Stillwater National has adopted a Severance Compensation Plan pursuant
to which Messrs. McCormick, Green, White and Crowell are entitled to lump-sum
severance compensation upon a qualifying termination of service equal to a
percentage of their respective total annual base compensation in effect at the
date of termination. For purposes of the Severance Compensation Plan, a
qualifying termination of service is defined as either an involuntary
termination of service or a voluntary termination of service for good reason, in
either case within two years following a change-in-control occurring after the
effective date of the Severance Compensation Plan. Good reason would include:
(i) a reduction in their base salary; (ii) their assignment without their
consent to a location other than in Oklahoma; (iii) the failure to maintain them
in a position of comparable authority or responsibility; or (iv) a material
reduction in their level of incentive compensation or benefits. A
change-in-control is deemed to occur whenever: (i) any entity or person becomes
the beneficial owner of or obtains voting control over 50% or more of the
outstanding shares of common stock of either Southwest or Stillwater National;
(ii) the shareholders of either Southwest or Stillwater National approve (a) a
merger or consolidation in which Southwest or Stillwater National is not the
survivor or pursuant to which the outstanding shares of either would be
converted into cash, securities or other property of another corporation other
than a transaction in which shareholders maintain the same proportionate
ownership interests, or (b) a sale or other disposition of all or substantially
all of the assets of either Southwest or Stillwater National; or (iii) there
shall have been a change in a majority of the Boards of Directors of either
Southwest or Stillwater National within a twelve-month period unless each new
director was approved by the vote of two-thirds of the directors still in office
who were in office at the beginning of the twelve-month period. Messrs.
McCormick, Green, White, and Crowell would have received lump-sum severance
payments of $262,400, $142,000, $121,250, and $111,400 respectively, upon a
qualifying termination of service if such termination had occurred on 
December 31, 1998.

                                       11
<PAGE>
 
            COMPENSATION COMMITTEE REPORT ON EXECUTIVE COMPENSATION

         As members of the Compensation Committees of the Company and the Bank,
it is our duty to review compensation policies applicable to senior officers; to
consider the relationship of corporate performance to that compensation; to
recommend salary and bonus levels for senior officers for consideration by the
Boards of Directors of the Company and the Bank; and to administer various
incentive plans of the Company and the Bank.

         Overview. Under the compensation policies of the Company, which are
endorsed by the Compensation Committee, compensation is paid based both on the
senior officer's performance and the performance of the entire Company. In
assessing the performance of the Company and the Bank for purposes of
compensation decisions, the Compensation Committee considers a number of
factors, including profits of the Company and the Bank during the past year
relative to their profit plans, changes in the value of the Company's stock,
reports of federal regulatory examinations of the Company and the Bank, growth,
business plans for future periods, and regulatory capital levels. The
Compensation Committee assesses individual executive performance based upon its
determination of the officer's contributions to the performance of the Company
and the accomplishment of the Company's strategic goals, such as the completion
of the Company's public offerings of common stock in 1993, Preferred Stock in
1995, and Trust Preferred Securities in 1997. In assessing performance for 1998
and previous years, the members of the Committee did not make use of a
mechanical weighing formula or use specific performance targets, but instead
weighed the described factors as they deemed appropriate in the total
circumstances.

         Base Salary. The 1998 salary levels of the Company's senior officers
were established consistent with this compensation policy. Mr. McCormick served
as the President and Chief Executive Officer of the Company throughout 1998. His
base compensation effective January 1, 1998, was based upon a review performed
by the Committee in 1997. In this review, the Committee considered the
performance of Mr. McCormick in managing the Company and the Bank, based upon
the 1997 financial performance of the Company; the financial performance trends
for 1997 and the preceding four years; the results of confidential regulatory
examinations; his continued involvement in community affairs in the communities
served by the Company; the Company's planned levels of financial performance for
1998; his management of the problem asset and lending issues that arose in 1997,
and the general management of the Company and the Bank for 1997. Based upon the
results of this review, the salary of Mr. McCormick was established at $262,400
per year for 1998, which represented an increase of 3% over his 1997 base
salary.

         Bonuses. Bonuses of $25,000, $10,000, and $10,000 were granted to Mr.
McCormick, Mr. Green, and Mr. Crowell in 1998 based upon each officer's
performance consistent with the compensation policy described above. No other
bonuses were awarded to Named Executive Officers in 1998.

         Stock Options. The purposes of the Company's Stock Option Plans (the
"Option Plans") are to attract, retain and motivate key officers of the Company
and the Bank by providing key officers with a stake in the success of the
Company, as measured by the value of its shares, and to increase the commonality
of interests among key employees and other shareholders. Members of the
Compensation Committee served as the Stock Option Committee, which had general
responsibility for granting stock options to key employees and administering the
Option Plans. During 1998, 

                                       12
<PAGE>
 
incentive stock options for 150,000 shares were granted at exercise prices of
$26.00 to $27.72 per share (the fair market value of the shares on the dates of
grant).Certain of these options are subject to shareholder approval. No stock
options were granted in 1998 to the Chief Executive Officer or any other
executive who was paid over $100,000 in compensation in that year.

         No member of the Compensation Committee is a former or current officer
or employee of the Company or the Bank.

March 25, 1999
                                                     Robert B. Rodgers, Chairman
                                                     Erd M. Johnson
                                                     David P. Lambert

                         STOCK PERFORMANCE COMPARISONS

         The following table compares the cumulative total return on a
hypothetical investment of $100 in Southwest's common stock at the closing price
on December 31, 1993 through December 31, 1998, with the hypothetical cumulative
total return on the Nasdaq Stock Market Index (U.S. Companies) and the Nasdaq
Bank Index for the comparable period.

- --------------------------------------------------------------------------------









- --------------------------------------------------------------------------------

<TABLE> 
<CAPTION> 
                       -----------------------------------------------------------
                       12/31/93  12/31/94  12/31/95  12/31/96  12/31/97  12/31/98
                       -----------------------------------------------------------
<S>                    <C>       <C>       <C>       <C>       <C>       <C> 
Southwest                $100     $106      $153        $172     $242      $229
                       -----------------------------------------------------------
NASDAQ Stock Market
Index (U.S.)              100       98       138         170      209       293
                       -----------------------------------------------------------
NASDAQ Bank Index         100      100       148         196      328       325
                       -----------------------------------------------------------
</TABLE> 

                                       13
<PAGE>
 
 
                             CERTAIN TRANSACTIONS

         Stillwater National has and expects to have in the future, banking
transactions with certain officers and directors of Southwest and Stillwater
National and greater than 5% shareholders of Southwest and their immediate
families and associates. These transactions are in the ordinary course of
business, and loans have been and will be made on substantially the same terms,
including interest rates and collateral, as those prevailing at the time for
comparable transactions with other persons. In the opinion of Southwest's
management, these loans did not involve more than normal risk of collectibility
or present other unfavorable features.

             PROPOSAL 2: AMENDMENT TO CERTIFICATE OF INCORPORATION
                          TO INCREASE AUTHORIZED STOCK

         The Board is seeking shareholder approval of an amendment to
Southwest's Certificate of Incorporation to increase the authorized common stock
from 10,000,000 shares to 20,000,000 shares. The amendment also would increase
total authorized capital stock (which includes both common and preferred stock)
to 22,000,000 shares. There would be no increase in authorized preferred stock.

         Southwest has no current plans to issue the newly authorized shares of
stock, but the Board is proposing the amendment to ensure that a sufficient
amount of capital stock is available for issuance in the future in possible
stock splits, stock dividends, corporate acquisitions, and for other corporate
purposes. The Board does not intend to issue any additional shares of capital
stock except on terms that it deems to be in the best interests of Southwest and
its shareholders.

         The Board believes that the proposed increase in the authorized capital
stock is in the best interest of Southwest and unanimously recommends a vote FOR
the proposed amendment.

Description of the Amendment

         The Board of Directors proposes to amend the first sentence of Article
V of the Articles of Incorporation to read in its entirety as follows:

                  The aggregate number of shares of all classes of capital stock
         which the Corporation has authority to issue is 22,000,000 of which
         20,000,000 are to be shares of common stock, $1.00 par value per share,
         of which 1,000,000 are to be shares of serial preferred stock, $1.00
         par value per share, and of which 1,000,000 shall be Class B serial
         preferred stock, $1.00 par value per share.

Purpose of Amendment

             The Certificate of Incorporation now authorizes the issuance of up
         to 12,000,000 shares of capital stock, including 10,000,000 shares of
         authorized common stock and 2,000,000 share of preferred stock. As of
         the record date, Southwest had      shares of common stock outstanding
         and     shares of common stock reserved for issuance under various
         compensation and benefit plans and Southwest's Dividend Reinvestment
         Plan, which leaves      shares available.

                                      14

<PAGE>
 
         In the future, the Board may issue capital stock in connection with,
among other things, stock splits, stock dividends, corporate acquisitions and
other transactions, and under existing and future benefit plans. In that event,
Southwest could need a substantial amount of capital stock available for
issuance, and the shares available as of the record date could be insufficient.

         Each share of common stock authorized for issuance has the same rights
as, and is identical in all respects to, each other share of common stock. The
newly authorized shares of capital stock will not affect the rights, such as
voting and liquidation rights, of the shares of common stock currently
outstanding. Shareholders will not have preemptive rights to purchase any
subsequently issued shares of capital stock. Southwest has no current plans to
issue the newly authorized shares of capital stock.

         Authorized, unissued and unreserved capital stock may be issued from
time to time for any proper purpose without further action of the shareholders,
except as required by the Certificate of Incorporation and applicable law. For
example, the Board may issue shares to accomplish a stock split without
shareholder approval, but shareholders approval would be required for a merger
of Southwest with an unaffiliated company.

         The ability of the Board of Directors to issue additional shares of
capital stock without additional shareholder approval may be deemed to have an
anti-takeover effect, since unissued and unreserved shares of capital stock
could be issued by the Board of Directors in circumstances that may have the
effect of deterring takeover bids. The Board of Directors does not intend to
issue any additional shares of capital stock except on terms which it deems in
the best interests of Southwest and its shareholders.

Vote Required and Recommendation of Board of Directors

         The proposed amendment to the Articles of Incorporation must be
approved by a majority of the outstanding stock entitled to vote. The Board
expects that substantially all of the 485,850 shares, or 11.91%, of the common
stock outstanding as of the record date over which directors and executive
officers of Southwest exercise voting power will be voted for the amendment to
increase the common stock.

    The Board recommends that shareholders vote FOR the proposed amendment.

                 Proposal 3: Approval of the Southwest Bancorp
                             1999 Stock Option Plan


         The Board has adopted the Southwest Bancorp 1999 Stock Option Plan (the
"Option Plan"), subject to approval by Southwest's shareholders. Following is
summary of the Option Plan. The Option Plan is attached as Exhibit A and should
be consulted for additional information.

                                      15

<PAGE>
 
Purpose of the Option Plan

         The purpose of the Option Plan is to advance the interests of Southwest
by providing directors and selected key employees of Stillwater National,
Southwest, and their affiliates with the opportunity to acquire shares of
Southwest's common stock. By encouraging stock ownership, Southwest seeks to
attract, retain, and motivate the best available personnel for positions of
substantial responsibility; to provide additional incentive to directors and key
employees of Southwest, Stillwater National, and their affiliates to promote the
success of the business as measured by the value of its shares; and generally to
increase the commonality of interests among directors, key employees, and other
shareholders.

         The Option Plan is intended to replace the Southwest Bancorp 1994 Stock
Option Plan (the "1994 Option Plan") upon this Option Plan's approval by
shareholders of Southwest. Options issued under the 1994 Option Plan will
continue in effect and will be subject to the requirements of the 1994 Option
Plan, but no new options will be granted under the 1994 Option Plan after this
Option Plan is approved by shareholders. The 1994 Option Plan does not provide
for grants of options to directors of Southwest, Stillwater National, or their
affiliates.

         Options for all of the shares authorized by the 1994 plan have been
granted. Options for 60,000 shares under the proposed Option Plan have been
granted, subject to shareholder approval. (See below.)

Description of the Option Plan

         Administration. The Option Plan is administered by a committee (the
"Committee") of at least three directors appointed by the Board unless the Board
chooses to administer the Option Plan directly. Subject to the terms of the
Option Plan, the Committee has the authority to select participants and to grant
options and other awards under the Option Plan, to determine the terms of those
awards, and otherwise to administer and interpret the Option Plan. Decisions of
the Committee are final and conclusive. Members of the Committee will be
indemnified to the full extent permissible under Southwest's Certificate of
Incorporation and Bylaws in connection with any claims or other actions relating
to any action taken under the Option Plan. At the date of this Proxy Statement,
the Committee consists of the Compensation Committee.

         Types of Awards; Eligible Persons. The Committee may grant stock
options, Stock Appreciation Rights ("SAR's") and restricted stock under the
Option Plan to directors and key employees designated by the Committee.
Southwest and its subsidiaries have not yet designated the employees who are
eligible to participate in the Option Plan but estimates that there will be
fewer than forty such employees. All of Southwest's and Stillwater National's
eleven executive officers and all ten outside directors will be eligible to
participate in the Option Plan. The Committee was authorized to grant the same
types of awards under the 1994 Plan, but the Committee has granted only options,
and has not granted SAR's or restricted stock awards.

         Options may be either incentive stock options ("ISOs") as defined in
Section 422 of the Internal Revenue Code (the "Code"), or options that are not
ISOs ("Non-ISOs"). Directors who are not employees are not eligible to receive
ISOs.

                                      16
<PAGE>
 
 
         The Committee has not determined the number, exercise price, or other
terms of awards that will be granted under the Option Plan, except for options
that were granted on February 18, 1999, subject to shareholder approval, to
officers who were not Named Executive Officers at an exercise price of $26.00
per share. This exercise price is the same as options granted to other officers
in December 1998 under the 1994 Plan, and was greater than the market price of $
24.375 on February 18, 1999. These options vest one-tenth on the date of grant
and one-tenth on each of the following nine anniversaries of the date of grant.

         Financial Effects of Awards. Southwest will receive no monetary
consideration for the granting of awards under the Option Plan. It will receive
no monetary consideration other than the option price for shares of common stock
issued to optionees upon the exercise of their options. It will receive no
monetary consideration upon the exercise of SAR's or the vesting of restricted
stock. Under current accounting standards, recognition of compensation expense
is not required when stock options are granted at the fair market value of the
common stock on the date the option is granted. Stock options are considered,
however, in the calculation of diluted earnings per share of Southwest. Awards
of SAR's generally require recognition of compensation expense based upon the
difference between their exercise price and the market value of the shares to
which they relate. Awards of restricted stock generally require the recognition
of compensation expense based upon the market value of the stock.

         Shares Available for Grants. The Option Plan reserves 420,000
authorized but unissued shares of common stock for issuance upon the exercise of
options issuance upon the exercise of options or SARs, or the grant of
restricted stock. In the event of any merger, consolidation, recapitalization,
reorganization, reclassification, stock dividend, split-up, combination of
shares or similar event in which the number or kind of shares is changed without
receipt or payment of consideration by Southwest, the Committee will adjust both
the number and kind of shares of stock as to which options, SARs and restricted
stock may be awarded under the Option Plan, the affected terms of all
outstanding options, SARs and shares of restricted stock, and the aggregate
number of shares of common stock remaining available for grant under the Option
Plan. Generally, the number of shares as to which SARs are granted are charged
against the aggregate number of shares available for grant under the Option
Plan, provided that, in the case of an SAR granted in conjunction with an
option, under circumstances in which the exercise of the SAR results in
termination of the option and vice versa, only the number of shares of common
stock subject to the option shall be charged against the aggregate number of
shares of common stock remaining available under the Option Plan. If Awards
should expire, become unexercisable or be forfeited for any reason without
having been exercised or become vested in full, the shares of common stock
subject to such Awards shall, unless the Option Plan shall have been terminated,
be available for the grant of additional Awards under the Option Plan.

         Duration of the Option Plan and Grants. The Option Plan has a term of
10 years from February 18, 1999, its effective date, after which date no Awards
may be granted. The maximum term for an Award is 10 years from the date of
grant, except that the maximum term of an ISO (and an SAR granted in tandem with
an ISO) may not exceed five years if the optionee owns more than 10% of the
common stock on the date of grant. The expiration of the Option Plan, or its
termination by the Committee, will not affect any Award then outstanding.

                                      17
<PAGE>
 
         Options. The exercise price of options may not be less than 100% of the
fair market value of the common stock on the date of grant. In the case of an
optionee who owns more than 10% of the outstanding common stock on the date of
grant, the option price may not be less than 110% of fair market value of the
shares. As required by federal tax laws, to the extent that the aggregate fair
market value (determined when an ISO is granted) of the common stock with
respect to which ISOs are exercisable by an optionee for the first time during
any calendar year (under all Option Plans of Southwest and of any subsidiary)
exceeds $100,000, the options will be treated as Non-ISOs, and not as ISOs. In
the event that the fair market value per share of the common stock falls below
the exercise price of previously granted options, the Committee will have the
authority, with the consent of the optionee, to cancel outstanding options and
to issue new options with an exercise price equal to the then current fair
market price per share of the common stock.

         SARs. An SAR may be granted in tandem with all or part of any option
granted under the Option Plan, or without any relationship to any option. An SAR
granted in tandem with an ISO must expire no later than the ISO, must have the
same exercise price as the ISO and may be exercised only when the ISO is
exercisable and when the fair market value of the shares subject to the ISO
exceeds the exercise price of the ISO. For SARs granted in tandem with options,
the optionee's exercise of the SAR cancels his right to exercise the option, and
vice versa. Regardless of whether an SAR is granted in tandem with an option,
exercise of the SAR will entitle the optionee to receive, as the Committee
prescribes in the grant, all or a percentage of the difference between (i) the
fair market value of the shares of common stock subject to the SAR at the time
of its exercise, and (ii) the fair market value of such shares at the time the
SAR was granted (or, in the case of SARs granted in tandem with options, the
exercise price). The exercise price as to any particular SAR shall not be less
than the fair market value of the optioned shares on the date of grant.

         Exercise of options and SARs. The exercise of options and SARs will be
subject to the terms and conditions established by the Committee in a written
agreement between the Committee and the optionee. In the absence of Committee
action to the contrary: (A) an otherwise unexpired ISO shall cease to be
exercisable upon (i) an employee's termination of employment for "just cause"
(as defined in the Option Plan), (ii) the date three months after an employee
terminates service for a reason other than just cause, death, or disability, or
(iii) the date one year after an employee terminates service due to disability,
or two years after termination of such service due to his death; (B) an
unexpired Non-ISO shall be exercisable at any time (but not later than the date
on which the Non-ISO would otherwise expire.) Notwithstanding the provisions of
any option which provides for its exercise in installments as designated by the
Committee, such option shall become immediately exercisable upon the optionee's
death or permanent and total disability.

         An otherwise exercisable SAR may be exercised only during the period
beginning on the third business day following the release for publication of
Southwest's quarterly or annual financial information, and ending on the twelfth
business day following such date. In no event, however, will any option or SAR
be exercisable after its expiration date, as to fractional shares of common
stock or prior to the optionee's satisfaction of any income tax withholding
requirements.

                                      18
<PAGE>
 
 
         A participant may exercise options or SARs, subject to provisions
relative to their termination and limitations on their exercise, only by (i)
written notice of intent to exercise the option or SAR with respect to a
specified number of shares of common stock, and (ii) in the case of options,
payment to Southwest (contemporaneously with delivery of such notice) in cash,
in common stock, or a combination of cash and common stock, of the amount of the
exercise price for the number of shares with respect to which the option is then
being exercised. Common stock utilized in full or partial payment of the
exercise price for options shall be valued at its market value at the date of
exercise. Although executive officers of Southwest generally would be prohibited
from profiting from certain purchases and sales of shares within any six-month
period under the federal securities laws, they generally will not be prohibited
by such laws from exercising options and immediately selling the shares they
receive, provided at least six months elapses between the grant of the option
and the sale of the common stock purchased on exercise of the option. As a
result, officers, like Southwest's and its affiliates' other participating
employees, generally will be permitted to benefit in the event the market price
for the shares exceeds the exercise price of their options, without being
subject to loss in the event the market price falls below the exercise price.

         Restricted Stock. The Committee has broad discretion at the time of
making a restricted stock grant to determine a period of between six months and
five years during which the shares granted will be subject to restrictions (the
"Restriction Period"), and the conditions that must be satisfied in order for
the shares of restricted stock to become unrestricted (i.e., vested and
nonforfeitable). For example, the Committee may condition vesting upon a
grantee's continued employment or upon the grantee's attainment of specific
corporate, divisional or individual performance standards or goals. The
Committee may impose special vesting rules applicable if the grantee retires,
becomes disabled or dies before the expiration of the Restriction Period or
satisfaction of the restrictions applicable to an award of restricted stock.

         The Committee shall determine the percentage of the award of restricted
stock which shall vest in the event of death, disability or retirement prior to
the expiration of the Restriction Period or the satisfaction of the restrictions
applicable to an award of restricted stock. Notwithstanding the Restriction
Period and the restrictions imposed by the Committee on the restricted stock,
the Committee may shorten the Restriction Period or waive any restrictions if
the Committee concludes that it is in the best interests of Southwest to do so.

         Until a grantee's interest vests, his or her restricted stock is
nontransferable and forfeitable. Nevertheless, the grantee is entitled to vote
the restricted stock and to receive dividends and other distributions made with
respect to the restricted stock. To the extent that a grantee becomes vested in
his or her restricted stock at any time during the Restriction Period and has
satisfied applicable income tax withholding obligations, Southwest will deliver
unrestricted shares of common stock to the grantee. At the end of the
Restriction Period, the grantee will forfeit to Southwest any shares of
restricted stock as to which he or she did not earn a vested interest during the
Restriction Period.


         Change in Control. Upon a change in control, all options and SARs are
immediately exercisable and fully vested, and all shares of restricted stock
become fully vested. At that time, the Committee may grant the optionee the
right to receive a cash payment in an amount equal to the excess of the market
value of the shares subject to an option over the exercise price of the option.
If 

                                      19
<PAGE>
 
there is (i) a liquidation or dissolution of Southwest, (ii) a merger or
consolidation in which Southwest is not the surviving entity; or (iii) the sale
or disposition of all or substantially all of Southwest's assets, then all of
the outstanding options must be surrendered in return for options for shares of
the acquiring company, shares of the acquiring company with a market value equal
to the excess of the market value of the shares subject to option on the date of
the transaction over the exercise price of the option, or cash equal to the
excess of the market value of the shares subject to option on the date of the
transaction over the exercise price of the option, as determined by the
Committee. In no event, however, may an option be exchanged for cash or an SAR
exercised within the six-month period following the date of its grant.

         A change in control under the Option Plan means any one of the
following events: (1) the acquisition of ownership or control of 51% or more of
any class of voting securities of Southwest or Stillwater National; (2) the
exercise of a controlling influence over the management or policies of
Stillwater National or Southwest by any person or by persons acting as a group
within the meaning of Section 13(d) of the Securities Exchange Act of 1934, or
(3) the failure of Continuing Directors to constitute at least two-thirds of the
Board of Southwest or Stillwater National during any period of two consecutive
years. A change in control does not include acquisition of ownership or control
of voting securities of Southwest by an employee benefit plan sponsored by
Southwest or Stillwater National; acquisition of voting securities by Southwest
through share repurchase or otherwise; or acquisition by an exchange of voting
securities with a successor to Southwest in a reorganization, such as a
re-incorporation, that does not have the purpose or effect of significantly
changing voting power or control. Continuing directors are those individuals who
were directors at the Effective Date of the Option Plan and those other
individuals whose election or nomination for election as a director was approved
by a vote of at least two-thirds of the continuing directors then in office. An
offer to effect a change in control means any offer to buy or acquire,
solicitation of an offer to sell, tender offer for, or request of invitation for
tenders of, 25% or more of any class of voting securities of Southwest for
value. The decision of the Committee as to whether a change in control has
occurred or an offer to effect a change in control has been received is
conclusive and binding.

         Although these provisions are included in the Option Plan primarily for
the protection of an employee-optionee in the event of a change in control of
Southwest, they may also be regarded as having a takeover defensive effect,
which may reduce Southwest's vulnerability to hostile takeover attempts and
certain other transactions which have not been negotiated with and approved by
the Board.

         Nontransferability. ISOs may not be sold, pledged, assigned,
hypothecated, transferred or disposed of in any manner other than by will or by
the laws of descent and distribution, or pursuant to the terms of a qualified
domestic relations order. Other awards may not be sold, pledged, assigned,
hypothecated, transferred or disposed of in any manner other than by will or by
the laws of descent and distribution, pursuant to the terms of a qualified
domestic relations order, or, in the sole discretion of the Committee, in
connection with a transfer for estate or retirement planning purposes to a trust
established for such purposes.


         Conditions on Issuance or Sale of Shares. The Committee has the
authority to impose restrictions on shares issued under the Option Plan that it
deems appropriate or desirable, including 


                                      20
<PAGE>
 
the authority to impose a right of first refusal or to establish repurchase
rights or both of these restrictions. The Committee may not issue shares unless
the issuance complies with applicable securities laws, and to that end may
require that an optionee or grantee make certain representations or warranties.
In addition, no shares that have been acquired upon exercise of an option may be
sold or otherwise disposed of (except by gift or upon death) before the end of a
six-month period that begins on the date the option was granted.

         Amendment and Termination of the Option Plan. The Board may from time
to time amend the terms of the Option Plan and, with respect to any shares at
the time not subject to options, suspend or terminate the Option Plan.
Shareholder approval is required for an amendment that would increase the number
of shares subject to the Option Plan or that would extend the term of the Option
Plan. No amendment, suspension or termination of the Option Plan will, without
the consent of any affected holders of an option, alter or impair any rights or
obligations under the option.

Federal Income Tax Consequences

         ISOs. An employee recognizes no taxable income upon the grant of ISOs.
If the optionee holds the option shares for at least two years from the date the
ISO is granted and one year from the date the ISO is exercised, any gain
realized on the sale of the shares received upon exercise of such ISO is taxed
as long-term capital gain. However, the difference between the fair market value
of the stock at the date of exercise and the exercise price of the ISO will be
treated as an item of tax preference in the year of exercise for purposes of the
alternative minimum tax. If the employee disposes of the shares before the
expiration of either of the special holding periods, the disposition is a
"disqualifying disposition." In this event, the employee will be required, at
the time of the disposition of the stock, to treat the lesser of the gain
realized or the difference between the exercise price and the fair market value
of the stock at the date of exercise as ordinary income and the excess, if any,
as capital gain.

         Southwest will not be entitled to any deduction for federal income tax
purposes as the result of the grant or exercise of an ISO, regardless of whether
or not the exercise of the ISO results in liability under the alternative
minimum tax. However, if the employee has ordinary income taxable as
compensation as a result of a disqualifying disposition, Southwest will be
entitled to deduct an equivalent amount.

         Non-ISOs. In the case of a Non-ISO, an optionee will recognize ordinary
income upon the exercise of the Non-ISO in an amount equal to the difference
between the fair market value of the shares on the date of exercise and the
option price (or, if the optionee is subject to certain restrictions imposed by
the federal securities laws, upon the lapse of those restrictions unless the
optionee makes a special tax election within 30 days after the date of exercise
to have the general rule apply). Upon a subsequent disposition of such shares,
any amount received by the optionee in excess of the fair market value of the
shares as of the exercise will be taxed as capital gain. Southwest will be
entitled to a deduction for federal income tax purposes at the same time and in
the same amount as the ordinary income recognized by the optionee in connection
with the exercise of a Non-ISO.


                                      21
<PAGE>
 
         SARs. The grant of an SAR has no tax effect on the optionee or
Southwest. Upon exercise of the SARs, however, any cash or common stock received
by the optionee in connection with the surrender of his or her SAR will be
treated as compensation income to the optionee, and Southwest will be entitled
to a business expense deduction for the amounts treated as such compensation
income.

         Restricted Stock. The grant of restricted stock has no tax effect on
Southwest or the grantee. When the shares become vested pursuant to the
restricted stock award, the grantee will recognize ordinary income equal to the
fair market value of the shares delivered to him or her under the restricted
stock award, and Southwest will be entitled to a business expense deduction in
the same amount.

         Recommendation and Vote Required

         The Board has determined that the Option Plan is desirable, cost
effective, and produces incentives that will benefit Southwest and its
shareholders. The Board is seeking shareholder approval of the Option Plan in
order to satisfy the requirements of the Code for favorable tax treatment of
incentive stock options, to exempt certain option transactions from the
short-swing trading rules of the Securities and Exchange Commission, and to
satisfy the rules of the National Association of Securities Dealers, Inc. for
continued listing of the common stock on the Nasdaq National Market.

         Approval of the Option Plan requires the favorable vote of a majority
of the votes represented at the Annual Meeting (assuming a quorum of a majority
of the outstanding shares of common stock is present).

         The Board recommends a vote "FOR" approval of the Option Plan.


                                      22
<PAGE>
 
         SECTION 16(A) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE

         Based solely on the Company's review of the copies of initial
statements of beneficial ownership on Form 3 and reports of changes in
beneficial ownership on Form 4 that it has received in the past year, annual
statements of changes in beneficial ownership on Form 5 with respect to the last
fiscal year, and written representations that no such annual statement of change
in beneficial ownership was required, the Company believes that all directors,
executive officers, and beneficial owners of more than 10% of its common stock
have timely filed those reports with respect to 1998. The Company makes no
representation regarding persons who have not identified themselves as being
subject to the reporting requirements of Section 16(a) of the Securities
Exchange Act of 1934, or of the appropriateness of disclaimers of beneficial
ownership.

               RELATIONSHIP WITH INDEPENDENT PUBLIC ACCOUNTANTS

         A representative of Deloitte & Touche LLP, the Company's independent
certified public accounting firm, is expected to be present at the Annual
Meeting to respond to shareholders' questions and will have the opportunity to
make a statement.


                                      23
<PAGE>
 
                                 OTHER MATTERS

         The Board is not aware of any business to come before the Annual
Meeting other than those matters described above in this Proxy Statement and
matters incident to the conduct of the Annual Meeting. However, if any other
matters should properly come before the Annual Meeting, it is intended that
proxies in the accompanying form will be voted as determined by a majority of
the Board of Directors.

                             STOCKHOLDER PROPOSALS

         Any stockholder proposal to take action at the year 2000 Annual Meeting
of Shareholders must be received at Southwest's executive office at 608 South
Main Street, Stillwater, Oklahoma 74074 no later than December 21, 1999, in
order to be eligible for inclusion in Southwest's proxy materials for that
meeting. Any such proposals shall be subject to the requirements of the proxy
rules adopted under the Securities Exchange Act of 1934.


                                 MISCELLANEOUS

         The cost of soliciting proxies will be borne by the Company. The
Company will reimburse brokerage firms and other custodians, nominees and
fiduciaries for reasonable expenses incurred by them in sending proxy materials
to the beneficial owners of common stock. In addition to solicitations by mail,
directors, officers and regular employees of the Company may solicit proxies
personally or by telephone without additional compensation.

         The Company's 1998 Annual Report to Shareholders, including financial
statements, has been mailed to all shareholders of record as of the close of
business on the Record Date. Any shareholder who has not received a copy of such
Annual Report may obtain a copy by writing to the Secretary of the Company. Such
Annual Report is not to be treated as a part of the proxy solicitation material
or as having been incorporated herein by reference.

                          ANNUAL REPORT ON FORM 10-K

         A copy of Southwest's Annual Report on Form 10-K for the year ended
December 31, 1998 as filed with the Securities and Exchange Commission will be
furnished without charge to shareholders as of the record date upon written
request to: Kerby E. Crowell, Southwest Bancorp, Inc., P.O. Box 1988,
Stillwater, Oklahoma 74076.

                                            BY ORDER OF THE BOARD OF DIRECTORS

                                            /s/ Deborah T. Bradley

                                            DEBORAH T. BRADLEY
                                            SECRETARY
Stillwater, Oklahoma
April 17, 1999

                                      24

<PAGE>
 
                                                                       EXHIBIT A
<PAGE>
 
                             SOUTHWEST BANCORP, INC.
                             1999 STOCK OPTION PLAN


         1. Purpose of the Plan.

         The purpose of this Southwest Bancorp, Inc. 1999 Stock Option Plan (the
"Plan") is to advance the interests of Southwest by providing directors and
selected key Employees of Stillwater National, Southwest, and their Affiliates
with the opportunity to acquire shares of Southwest's' common stock. By
encouraging stock ownership, Southwest seeks to attract, retain and motivate the
best available personnel for positions of substantial responsibility; to provide
additional incentive to directors and key Employees of Southwest or any
Affiliate to promote the success of the business as measured by the value of its
shares; and generally to increase the commonality of interests among directors,
key employees and other shareholders.

         The Plan is intended to replace the Southwest Bancorp, Inc. 1994 Stock
Option Plan (the "1994 Plan") upon this Plan's approval by shareholders of
Southwest. Options issued under the 1994 Plan will continue in effect and will
be subject to the requirements of the 1994 Plan, but no new options will be
granted under the 1994 Plan after this Plan is approved by shareholders.

         The Plan is not intended as an agreement or promise of employment.
Neither the Plan, nor any Option granted pursuant to the Plan, confers on any
person any right to continue in the employ of Southwest. The right of Southwest,
Stillwater National, or any of their affiliates to terminate the employment of
an Employee is not limited by the Plan or by any Option granted pursuant to the
Plan unless such right is specifically described by the terms of any such
Option.


         2. Definitions.

         (a)   "Affiliate" shall mean any "parent corporation" or "subsidiary
corporation" of Southwest, as such terms are defined in Section 424(e) and (f),
respectively, of the Code.

         (b)   "Agreement" shall mean a written agreement entered into in
accordance with Paragraph 5(c).

         (c)   "Awards" shall mean, collectively, Options, SARs, and Restricted
Stock, unless the context clearly indicates a different meaning.

         (d)   "Board" shall mean the Board of Directors of Southwest.

         (e)   "Change in Control" shall mean any one of the following events
occurring after the Effective Date: (1) the acquisition of ownership, holding or
power to vote more than 51% of any class if voting securities of Stillwater
National or Southwest, (2) the acquisition of the power to control the election
of a majority of Stillwater National's or Southwest's directors, (3) the
exercise of a controlling influence over the management or policies of
Stillwater National or Southwest by any person or by persons acting as a "group"
(within the meaning of Section 13(d) of the Securities Exchange Act of 1934), or
(4) the failure of Continuing Directors to constitute at least two-thirds of the
Board of Directors of Southwest or Stillwater National (the "Southwest Board")
during any period of two consecutive years. For purposes of this Plan,
"Continuing Directors" shall include only those individuals who were members of
Southwest Board at the Effective Date and those other individuals whose election
or nomination for election as a member of Southwest Board was approved by a vote
of at least two-thirds of the Continuing Directors then in office. For purposes
of this subparagraph only, the term "person" refers to an individual or a
corporation, partnership, trust, association, joint venture, pool, syndicate,
sole proprietorship, unincorporated organization or any other form of entity not
specifically listed herein. The decision of the Committee as to whether a change
in control has occurred shall be conclusive and binding.

         (f)   "Code" shall mean the Internal Revenue Code of 1986, as amended.
<PAGE>
 
         (g)   "Committee" shall mean the Stock Option Committee appointed by
the Board in accordance with Paragraph 5(a) hereof.

         (h)   "Common Stock" shall mean the common stock, par value $1.00 per
share, of Southwest.

         (i)   "Continuous Service" shall mean the absence of any interruption
or termination of service as an Employee of Southwest or any present or future
Affiliate. Continuous Service shall not be considered interrupted in the case of
sick leave, military leave or any other leave of absence approved by Southwest
or in the case of transfers between payroll locations of Southwest or among
Southwest, Stillwater National or any other Affiliate.

         (j)   "Effective Date" shall mean the date specified in Paragraph 15
hereof.

         (k)   "Employee" shall mean any person employed by Southwest or by an
Affiliate.

         (l)   "Exercise Price" shall mean the price per Optioned Share at which
an Option or SAR may be exercised.

         (m)   "ISO" means an option to purchase Common Stock which meets the
requirements set forth in the Plan, and which is intended to be and is
identified as an "incentive stock option" within the meaning of Section 422 of
the Code.

         (n)   "Market Value" shall mean the fair market value of the Common
Stock, as determined under Paragraph 7(b) hereof.

         (o)   "Non-Employee Director" means any member of the Board who, at the
time discretion under the Plan is exercised, is a "Non-Employee Director" within
the meaning of Rule 16b-3.

         (p)   "Non-ISO" means an option to purchase Common Stock which meets
the requirements set forth in the Plan but which is not intended to be and is
not identified as an ISO, except in the circumstance described in Section 6(b)
of the Plan.

         (q)   "Option" means an ISO and/or a Non-ISO.

         (r)   "Optioned Shares" shall mean Shares subject to an Option granted
pursuant to this Plan.

         (s)   "Outstanding Shares" shall mean the total shares of Common Stock
which have been issued and which (a) are not held as treasury shares, and (b)
have not been cancelled or retired by Southwest.

         (t)   "Parent" shall mean any present or future corporation that would
be a "parent corporation" as defined in Subsections 424(e) and (g) of the Code.

         (u)   "Participant" shall mean any person who receives an Award
pursuant to the Plan.

         (v)   "Plan" shall mean the Southwest Bancorp, Inc. 1994 Stock Option
Plan.

         (w)   "Restricted Stock" means Common Stock which is subject to
restrictions against transfer and forfeiture and such other terms and conditions
determined by the Committee, as provided in Paragraph 10.

         (x)   "Rule 16b-3" shall mean Rule 16b-3 of the General Rules and
Regulations under the Securities Exchange Act of 1934, as amended.

         (y)   "SAR" (or "Stock Appreciation Right") means a right to receive
the appreciation in value, or a portion of the appreciation in value, of a
specified number of shares of Common Stock.
<PAGE>
 
         (z)   "Share" shall mean one share of Common Stock.

         (aa)  "Southwest" shall mean Southwest Bancorp, Inc.

         (bb)  "Stillwater National" shall mean Stillwater National Bank & Trust
Company.

         (cc)  "Subsidiary" shall mean any present or future corporation which
would be a "subsidiary corporation" as defined in Subsections 424(f) and (g) of
the Code.

         (dd)  "Transaction" means (i) the liquidation or dissolution of the
Company, (ii) a merger or consolidation in which the Company is not the
surviving entity; or (iii) the sale or disposition of all or substantially all
of the Company's assets.


         3. Term of the Plan and Awards.

         (a)   Term of the Plan. The Plan shall continue in effect for a term of
ten years from the Effective Date, unless sooner terminated pursuant to
Paragraph 18 hereof. No Award shall be granted under the Plan after ten years
from the Effective Date.

         (b)   Term of Awards. The term of each Award granted under the Plan
shall be established by the Committee, but shall not exceed 10 years; provided,
however, that in the case of an Employee who owns Shares representing more than
10% of the outstanding shares of Common Stock at the time an ISO is granted, the
term of such ISO shall not exceed five years.


         4. Shares Subject to the Plan.

         (a)   General Rule. Except as otherwise required by the provisions of
Paragraph 12 hereof, the aggregate number of Shares deliverable pursuant to
Awards shall not exceed 420,000 Shares. Optioned Shares may either be authorized
but unissued Shares or Shares held in treasury. If Awards should expire, become
unexercisable or be forfeited for any reason without having been exercised or
become vested in full, the Optioned Shares shall, unless the Plan shall have
been terminated, be available for the grant of additional Awards under the Plan.

         (b)   Special Rule for SARs. The number of Shares with respect to which
an SAR is granted, but not the number of Shares which Southwest delivers or
could deliver to an Employee or individual upon exercise of an SAR, shall be
charged against the aggregate number of Shares remaining available under the
Plan; provided, however, that in the case of an SAR granted in conjunction with
an Option, under circumstances in which the exercise of the SAR results in
termination of the Option and vice versa, only the number of Shares subject to
the Option shall be charged against the aggregate number of Shares remaining
available under the Plan. The Shares involved in an Option as to which option
rights have terminated by reason of the exercise of a related SAR, as provided
in Paragraph 9 hereof, shall not be available for the grant of further Options
under the Plan.


         5. Administration of the Plan.

         (a)   Composition of the Committee. The Plan shall be administered by
the Committee, which shall consist of not less than three (3) Directors
appointed by the Board. Members of the Committee may be Employee Directors or
Non-Employee Directors, and shall serve at the pleasure of the Board. In the
absence at any time of a duly appointed Committee, the Plan shall be
administered by the Board.
<PAGE>
 
         (b)   Powers of the Committee. Except as limited by the express
provisions of the Plan or by resolutions adopted by the Board, the Committee
shall have sole and complete authority and discretion (i) to select Participants
and grant Awards, (ii) to determine the form and content of Awards to be issued
in the form of Agreements under the Plan, (iii) to interpret the Plan, (iv) to
prescribe, amend and rescind rules and regulations relating to the Plan, and (v)
to make other determinations necessary or advisable for the administration of
the Plan. The Committee shall have and may exercise such other power and
authority as may be delegated to it by the Board from time to time. A majority
of the entire Committee shall constitute a quorum and the action of a majority
of the members present at any meeting at which a quorum is present, or acts
approved in writing by a majority of the Committee without a meeting, shall be
deemed the action of the Committee.

         (c)   Agreement. Each Award shall be evidenced by a written agreement
containing such provisions as may be approved by the Committee. Each such
Agreement shall constitute a binding contract between Southwest and the
Participant, and every Participant, upon acceptance of such Agreement, shall be
bound by the terms and restrictions of the Plan and of such Agreement. The terms
of each such Agreement shall be in accordance with the Plan, but each Agreement
may include such additional provisions and restrictions determined by the
Committee, in its discretion, provided that such additional provisions and
restrictions are not inconsistent with the terms of the Plan. In particular, the
Committee shall set forth in each Agreement (i) the Exercise Price of an Option
or SAR, (ii) the number of Shares subject to, and the expiration date of, the
Award, (iii) the manner, time and rate (cumulative or otherwise) of exercise or
vesting of such Award, and (iv) the restrictions, if any, to be placed upon such
Award, or upon Shares which may be issued upon exercise of such Award.

         The Chairman of the Committee and such other officers as shall be
designated by the Committee are hereby authorized to execute Agreements on
behalf of Southwest and to cause them to be delivered to the recipients of
Awards.

         (d)   Effect of the Committee's Decisions. All decisions,
determinations and interpretations of the Committee shall be final and
conclusive on all persons affected thereby.

         (e)   Indemnification. In addition to such other rights of
indemnification as they may have, the members of the Committee shall be
indemnified by Southwest in connection with any claim, action, suit or
proceeding relating to any action taken or failure to act under or in connection
with the Plan or any Award, granted hereunder to the full extent provided for
under Southwest's Certificate of Incorporation or Bylaws with respect to the
indemnification of Directors.


         6. Grant of Options.

         (a)   General Rule. The Committee, in its sole discretion, may grant
ISO's or Non-ISOs to Employees of the Company or its Affiliates and may grant
Non-ISOs to Directors or directors of Affiliates.

         (b)   Special Rules for ISOs. The aggregate Market Value, as of the
date the Option is granted, of the Shares with respect to which ISOs are
exercisable for the first time by an Employee during any calendar year (under
all incentive stock option plans, as defined in Section 422 of the Code, of
Southwest or any present or future Parent or Subsidiary of Southwest) shall not
exceed $100,000. Notwithstanding the prior provisions of this paragraph, the
Committee may grant Options in excess of the foregoing limitations, in which
case such Options granted in excess of such limitation shall be Options which
are Non-ISOs.


         7. Exercise Price for Options.

         (a)   Limits on Committee Discretion. The Exercise Price as to any
particular Option granted under the Plan shall not be less than the Market Value
of the Optioned Shares on the date of grant. In the case of an Employee who owns
Shares representing more than 10% of Southwest's Outstanding Shares of Common
Stock at the time an ISO is granted, the Exercise Price shall not be less than
110% of the Market Value of the Optioned Shares at the time the ISO is granted.
<PAGE>
 
         (b)   Standards for Determining Exercise Price. If the Common Stock is
listed on a national securities exchange (including the NASDAQ National Market)
on the date in question, then the Market Value per Share shall be not less than
the average of the highest and lowest selling price on such exchange on such
date, or if there were no sales on such date, then the Exercise Price shall be
not less than the mean between the bid and asked price on such date. If the
Common Stock is traded otherwise than on a national securities exchange on the
date in question, then the Market Value per Share shall be not less than the
mean between the bid and asked price on such date, or, if there is no bid and
asked price on such date, then on the next prior business day on which there was
a bid and asked price. If no such bid and asked price is available, then the
Market Value per Share shall be its fair market value as determined by the
Committee, in its sole and absolute discretion.

         (c)   Reissuance of Options and SARs. Notwithstanding anything herein
to the contrary, the Committee shall have the authority to cancel outstanding
Options and/or SARs with the consent of the Participant and to reissue new
Options and/or SARs at a lower Exercise Price equal to the then Market Value per
share of Common Stock in the event that the Market Value per share of Common
Stock at any time prior to the date of exercise of outstanding Options and/or
SARs falls below the Exercise Price.


         8. Exercise of Options.

         (a)   Generally. Any Option granted hereunder shall be exercisable at
such times and under such conditions as shall be permissible under the terms of
the Plan and of the Agreement granted to a Participant. An Option may not be
exercised for a fractional Share.

         (b)   Procedure for Exercise. A Participant may exercise Options,
subject to provisions relative to its termination and limitations on its
exercise, only by (1) written notice of intent to exercise the Option with
respect to a specified number of Shares, and (2) payment to Southwest
(contemporaneously with delivery of such notice) in cash, in Common Stock, or a
combination of cash and Common Stock, of the amount of the Exercise Price for
the number of Shares with respect to which the Option is then being exercised.
Each such notice (and payment where required) shall be delivered, or mailed by
prepaid registered or certified mail, addressed to the Treasurer of Southwest at
Southwest's executive offices. Common Stock utilized in full or partial payment
of the Exercise Price for Options shall be valued at its Market Value at the
date of exercise.

         (c)   Notwithstanding the provisions of any Option that provides for
its exercise in installments as designated by the Committee, such Option shall
become immediately exercisable upon the Optionee's death or Permanent and Total
Disability.

         (d)   Period of Exercisability-ISOs. An ISO may be exercised by an
Optionee only while the Optionee is an Employee and has maintained Continuous
Service from the date of the grant of the ISO, or within three months after
termination of such Continuous Service (but not later than the date on which the
Option would otherwise expire), except if the Employee's Continuous Service
terminates by reason of -

               (1) "Just Cause" which for purposes hereof shall have the meaning
               set forth in any unexpired employment or severance agreement
               between the Optionee and the Company or any Affiliate (and, in
               the absence of any such agreement, means termination because of
               the Employee's personal dishonesty, incompetence, willful
               misconduct, breach of fiduciary duty involving personal profit,
               intentional failure to perform stated duties, willful violation
               of any law, rule or regulation (other than traffic violations or
               similar offenses) or final cease-and-desist order), then the
               Optionee's rights to exercise such ISO shall expire on the date
               of such termination;

               (2) Death, then an ISO of the deceased Optionee may be exercised
               within two years from the date of his death (but not later than
               the date on which the Option would otherwise expire) by the
               personal representatives of his estate or person or persons to
               whom his rights under such ISO shall have passed by will or by
               laws of descent and distribution;

<PAGE>
 
               (3)   Permanent and Total Disability (as such term is defined in
               Section 22(e)(3) of the Code), then an ISO may be exercised
               within one year from the date of such Permanent and Total
               Disability, but not later than the date on which the ISO would
               otherwise expire.

         (e)   Period of Exercisability-Non-ISOs. Except to the extent otherwise
provided in the terms of an Agreement, a Non-ISO may be exercised by an Optionee
only while such Optionee is an Employee, a Director, or a director of an
Affiliate, or within three months after termination of such service (but not
later than the date on with the Option would otherwise expire), except if the
Optionee's service terminates by reason of -

               (1)   "Just Cause" which for purposes hereof shall have the
               meaning set forth in any unexpired employment or severance
               agreement between the Optionee and the Company or any Affiliate
               (and, in the absence of any such agreement, means termination
               because of the Optionee's personal dishonesty, incompetence,
               willful misconduct, breach of fiduciary duty involving personal
               profit, intentional failure to perform stated duties, willful
               violation of any law, rule or regulation (other than traffic
               violations or similar offenses) or final cease-and-desist order),
               then the Optionee's rights to exercise such Non-ISO shall expire
               on the date of such termination; or

               (2)   Removal from the Board or the Bank Board pursuant to the
               respective Articles of Incorporation, then the Optionee's rights
               to exercise such Non-ISO shall expire on the date of such
               removal.

               (3)   Death, then a Non-ISO of the deceased Optionee may be
               exercised within two years from the date of his death (but not
               later than the date on which the Option would otherwise expire)
               by the personal representatives of his estate or person or
               persons to whom his rights under such Non-ISO shall have passed
               by will or by laws of descent and distribution or otherwise shall
               have transferred pursuant to this Plan;

               (4)   Permanent and Total Disability (as such term is defined in
               Section 22(e)(3) of the Code), then a Non-ISO may be exercised
               within one year from the date of such Permanent and Total
               Disability, but not later than the date on which the ISO would
               otherwise expire.

         (f)   Effect of the Committee's Decisions. The Committee's
determination whether a Participant's Continuous Service has ceased, and the
effective date thereof shall be final and conclusive on all persons affected
thereby.


         9.    SARs (Stock Appreciation Rights)

         (a)   Granting of SARs. In its sole discretion, the Committee may from
time to time grant SARs to Employees either in conjunction with, or
independently of, any Options granted under the Plan. An SAR granted in
conjunction with an Option may be an alternative right wherein the exercise of
the Option terminates the SAR to the extent of the number of shares purchased
upon exercise of the Option and, correspondingly, the exercise of the SAR
terminates the Option to the extent of the number of Shares with respect to
which the SAR is exercised. Alternatively, an SAR granted in conjunction with an
Option may be an additional right wherein both the SAR and the Option may be
exercised. An SAR may not be granted in conjunction with an ISO under
circumstances in which the exercise of the SAR affects the right to exercise the
ISO or vice versa, unless the SAR, by its terms, meets all of the following
requirements:

         (1)   The SAR will expire no later than the ISO;

         (2)   The SAR may be for no more than the difference between the
         Exercise Price of the ISO and the Market Value of the Shares subject to
         the ISO at the time the SAR is exercised;

         (3)   The SAR is transferable only when the ISO is transferable, and
         under the same conditions;
<PAGE>
 
         (4)   The SAR may be exercised only when the ISO may be exercised; and

         (5)   The SAR may be exercised only when the Market Value of the Shares
         subject to the ISO exceeds the Exercise Price of the ISO.

         (b)   Exercise Price. The Exercise Price as to any particular SAR shall
not be less than the Market Value of the Optioned Shares on the date of grant.

         (c)   Timing of Exercise. Any election by a Participant to exercise
SARs shall be made during the period beginning on the 3rd business day following
the release for publication of quarterly or annual financial information and
ending on the 12th business day following such date. This condition shall be
deemed to be satisfied when the specified financial data is first made publicly
available. In no event, however, may an SAR be exercised within the six-month
period following the date of its grant.

         (d)   Exercise of SARs. An SAR granted hereunder shall be exercisable
at such times and under such conditions as shall be permissible under the terms
of the Plan and of the Agreement granted to a Participant, provided that an SAR
may not be exercised for a fractional Share. Upon exercise of an SAR, the
Participant shall be entitled to receive, without payment to Southwest except
for applicable withholding taxes, an amount equal to the excess of (or, in the
discretion of the Committee if provided in the Agreement, a portion of) the
excess of the then aggregate Market Value of the number of Optioned Shares with
respect to which the Participant exercises the SAR, over the aggregate Exercise
Price of such number of Optioned Shares. This amount shall be payable by
Southwest, in the discretion of the Committee, in cash or in Shares valued at
the then Market Value thereof, or any combination thereof. The provisions of
Paragraphs 8(c) and 8(e) regarding the period of exercisability of Options are
incorporated by reference herein, and shall determine the period of
exercisability of SARs.

         (e)   Procedure for Exercising SARs. To the extent not inconsistent
herewith, the provisions of Paragraph 8(b) as to the procedure for exercising
Options are incorporated by reference, and shall determine the procedure for
exercising SARs.


         10.   Restricted Stock Awards.

         Any Share of Restricted Stock which the Committee may grant to key
Employees shall be subject to the following terms and conditions, and to such
other terms and conditions as are either applicable generally to Awards, or
prescribed by the Committee in the applicable Agreement:

         (a)   Restriction Period. At the time of each award of Restricted
Stock, there shall be established for the Restricted Stock a restriction period,
which shall be no less than 6 months and no greater than 5 years (the
"Restriction Period"). Such Restriction Period may differ among Participants and
may have different expiration dates with respect to portions of shares of
Restricted Stock covered by the same award.

         (b)   Vesting Restrictions. The Committee shall determine the
restrictions applicable to the award of Restricted Stock, including, but not
limited to, requirements of Continuous Service for a specified term, or the
attainment of specific corporate, divisional or individual performance standards
or goals, which restrictions may differ with respect to each Participant. The
Agreement shall provide for forfeiture of Shares covered thereby if the
specified restrictions are not met during the Restriction Period, and may
provide for early termination of any Restriction Period in the event of
satisfaction of the specified restrictions prior to expiration of the Restricted
Period.

         (c)   Vesting upon Death, Disability, or Retirement. The Committee
shall set forth in the Agreement the percentage of the award of Restricted Stock
which shall vest in the Participant in the event of death, disability or
retirement prior to the expiration of the Restriction Period or the satisfaction
of the restrictions applicable to an award of Restricted Stock.
<PAGE>
 
         (d)   Acceleration of Vesting. Notwithstanding the Restriction Period
and the restrictions imposed on the Restricted Stock, as set forth in any
Agreement, the Committee may shorten the Restriction Period or waive any
restrictions, if the Committee concludes that it is in the best interests of
Southwest to do so.

         (e)   Ownership; Voting. Stock certificates shall be issued in respect
of Restricted Stock awarded hereunder and shall be registered in the name of the
Participant, whereupon the Participant shall become a stockholder of Southwest
with respect to such Restricted Stock and shall, to the extent not inconsistent
with express provisions of the Plan, have all the rights of a stockholder,
including but not limited to the right to receive all dividends paid on such
Shares and the right to vote such Shares. Said stock certificates shall be
deposited with Southwest or its designee, together with a stock power endorsed
in blank, and the following legend shall be placed upon such certificates
reflecting that the shares represented thereby are subject to restrictions
against transfer and forfeiture:

               "The transferability of this certificate and the shares of stock
         represented thereby are subject to the terms and conditions (including
         forfeiture) contained in the 1994 Stock Option Plan of Southwest
         Bancorp, Inc., and an agreement entered into between the registered
         owner and Southwest Bancorp, Inc.. Copies of such Plan and Agreement
         are on file in the offices of the Secretary of Southwest Bancorp, Inc.,
         608 South Main Street, Stillwater, Oklahoma 74074.

         (f)   Lapse of Restrictions. At the expiration of the Restricted Period
applicable to the Restricted Stock, Southwest shall deliver to the Participant,
or the legal representative of the Participant's estate, or if the personal
representative of the Participant's estate shall have assigned the estate's
interest in the Restricted Stock, to the person or persons to whom his rights
under such Stock shall have passed by assignment pursuant to his will or to the
laws of descent and distribution, the stock certificates deposited with it or
its designee and as to which the Restricted Period has expired and the
requirements of the restrictions have been met. If a legend has been placed on
such certificates, Southwest shall cause such certificates to be reissued
without the legend.

         (g)   Forfeiture of Restricted Stock. The Agreement shall provide for
forfeiture of any Restricted Stock which is not vested in the Participant or for
which the restrictions have not been satisfied during the Restriction Period.


         11.   Effect of Changes in Control and Changes in Common Stock Subject
to the Plan.

(a)      Effects of Change in Control.

               (1)   Notwithstanding the provisions of any Award that provides
               for its exercise or vesting in installments, all Awards shall be
               immediately exercisable and fully vested upon a Change in
               Control.

               (2)   At the time of a Change in Control, each Optionee shall, at
               the sole and absolute discretion of the Committee, be entitled to
               receive a cash payment in an amount equal to the excess of the
               Market Value of the Shares subject to such Option over the
               Exercise Price of such Option, provided that in no event may an
               Option be cancelled in exchange for cash within the six-month
               period following the date of its grant. For purposes of
               calculating this payment, the Market Value shall be the Market
               Value at the date of the Change in Control as determined by the
               Committee.

               (3)   In the event there is a Transaction, all outstanding Awards
               shall be surrendered. With respect to each Award so surrendered,
               the Committee shall in its sole and absolute discretion determine
               whether the holder of each Award so surrendered shall receive--

                     (A)   For each Share then subject to an outstanding Award,
                     an Award for the number and kind of shares into which each
                     Outstanding Share (other than Shares held by dissenting
                     shareholders) is changed or exchanged, together with an
                     appropriate adjustment to the Exercise Price in the case of
                     Options and SARs; or
<PAGE>
 
                     (B)   With respect to Options, the number and kind of
                     shares into which each Outstanding Share (other than Shares
                     held by dissenting shareholders) is changed or exchanged in
                     the Transaction that are equal in market value to the
                     excess of the Market Value on the date of the Transaction
                     of the Shares subject to the Option, over the Exercise
                     Price of the Option; or

                     (C)   A cash payment (from the Company or the successor
                     corporation), in an amount equal to the excess of the
                     Market Value on the date of the Transaction of the Shares
                     subject to the Award, less the Exercise Price of the Award
                     in the case of Options and SARs.

               (4)   The decision of the Committee as to whether a Change in
                     Control has occurred shall be conclusive and binding.

         (b)   Recapitalizations, Stock Splits, Etc. The number and kind of
shares reserved for issuance under the Plan, and the number and kind of shares
subject to outstanding Options and the Exercise Price thereof, shall be
proportionately adjusted for any increase, decrease, change or exchange of
Shares for a different number or kind of shares or other securities of the
Company which results from a merger, consolidation, recapitalization,
reorganization, reclassification, stock dividend, split-up, combination of
shares, or similar event in which the number or kind of shares is changed
without the receipt or payment of consideration by the Company.

         (c)   Special Rule for ISOs. Any adjustment made pursuant to
subparagraphs (a)(3)(A) or (b) of this Paragraph shall be made in such a manner
as not to constitute a modification, within the meaning of Section 424(h) of the
Code, of outstanding ISOs.

         (d)   Conditions and Restrictions on New, Additional, or Different
Shares or Securities. If, by reason of any adjustment made pursuant to this
Paragraph, an Optionee becomes entitled to new, additional, or different shares
of stock or securities, such new, additional, or different shares of stock or
securities shall thereupon be subject to all of the conditions and restrictions
which were applicable to the Shares pursuant to the Option before the adjustment
was made.

         (e)   Other Issuances. Except as expressly provided in this Paragraph,
the issuance by the Company or an Affiliate of shares of stock of any class, or
of securities convertible into Shares or stock of another class, for cash or
property or for labor or services either upon direct sale or upon the exercise
of rights or warrants to subscribe therefor, shall not affect, and no adjustment
shall be made with respect to, the number, class, or Exercise Price of Shares
then subject to Options or reserved for issuance under the Plan.


         12.  Non-Transferability of Options.

         (a)   ISOs may not be sold, pledged, assigned, hypothecated,
transferred or disposed of in any manner other than by will or by the laws of
descent and distribution, or pursuant to the terms of a "qualified domestic
relations order" (within the meaning of Section 414(p) of the Code and the
regulations and rulings thereunder).

         (b)   Awards other than ISO's may not be sold, pledged, assigned,
hypothecated, transferred or disposed of in any manner other than by will or by
the laws of descent and distribution, pursuant to the terms of a "qualified
domestic relations order" (within the meaning of Section 414(p) of the Code and
the regulations and rulings thereunder), or, in the sole discretion of the
Committee, in connection with a transfer for estate or retirement planning
purposes to a trust established for such purposes.
<PAGE>
 
         13. Time of Granting Awards.

         The date of grant of an Award shall, for all purposes, be the later of
the date on which the Committee makes the determination of granting such Award,
and the Effective Date. Notice of the determination shall be given to each
Participant to whom an Award is so granted within a reasonable time after the
date of such grant.


         14. Effective Date.

         The Plan shall be effective as of February 18, 1999. Awards may be made
prior to approval of the Plan by the stockholders of Southwest if the exercise
of Awards in the form of Options and/or SARs, and the vesting of Awards in the
form of Restricted Stock, are conditioned upon stockholder approval of the Plan.


         15. Approval by Stockholders.

         The Plan shall be approved by stockholders of Southwest within twelve
(12) months before or after the Effective Date.


         16. Modification of Awards.

         At any time, and from time to time, the Board may authorize the
Committee to direct execution of an instrument providing for the modification of
any outstanding Award, provided no such modification shall confer on the holder
of said Award any right or benefit which could not be conferred on him by the
grant of a new Award at such time, or impair the Award without the consent of
the holder of the Award.


         17. Amendment and Termination of the Plan.

         The Board may from time to time amend the terms of the Plan and, with
respect to any Shares at the time not subject to Awards, suspend or terminate
the Plan; provided that the provisions of Paragraph 9 may not be amended more
than once every six months (other than to comport with changes in the Code, the
Employee Retirement Income Security Act of 1974, as amended, or the rules
thereunder), and provided further that any amendment that is "material" within
the meaning of Rule 16b-3 shall be subject to stockholder approval.

         No amendment, suspension or termination of the Plan shall, without the
consent of any affected holders of an Award, alter or impair any rights or
obligations under any Award theretofore granted.


         18. Conditions Upon Issuance of Shares.

         (a)   Compliance with Securities Laws. Shares of Common Stock shall not
be issued with respect to any Award unless the issuance and delivery of such
Shares shall comply with all relevant provisions of law, including, without
limitation, the Securities Act of 1933, as amended, the rules and regulations
promulgated thereunder, any applicable state securities law, and the
requirements of any stock exchange upon which the Shares may then be listed. The
Plan is intended to comply with Rule 16b-3, and any provision of the Plan which
the Committee determines in its sole and absolute discretion to be inconsistent
with said Rule shall, to the extent of such inconsistency, be inoperative and
null and void, and shall not affect the validity of the remaining provisions of
the Plan.
<PAGE>
 
         (b)   Special Circumstances. The inability of Southwest to obtain
approval from any regulatory body or authority deemed by Southwest's counsel to
be necessary to the lawful issuance and sale of any Shares hereunder shall
relieve Southwest of any liability in respect of the non-issuance or sale of
such Shares. As a condition to the exercise of an Option or SAR, Southwest may
require the person exercising the Option or SAR to make such representations and
warranties as may be necessary to assure the availability of an exemption from
the registration requirements of federal or state securities law.

         (c)   Committee Discretion. The Committee shall have the
discretionary authority to impose in Agreements such restrictions on Shares as
it may deem appropriate or desirable, including but not limited to the authority
to impose a right of first refusal or to establish repurchase rights or both of
these restrictions.


         19. Reservation of Shares.

         Southwest, during the term of the Plan, will reserve and keep available
a number of Shares sufficient to satisfy the requirements of the Plan.


         20. Withholding Tax.

         Southwest's obligation to deliver dividends on Restricted Stock, or to
deliver Shares upon exercise of Options and/or SARs or upon the vesting of
Restricted Stock (or such earlier time that the Participant makes an election
under Section 83(b) of the Code) shall be subject to the Participant's
satisfaction of all applicable federal, state and local income and employment
tax withholding obligations. The Committee, in its discretion, may permit the
Participant to satisfy the obligation, in whole or in part, by irrevocably
electing to have Southwest withhold Shares, or to deliver to Southwest Shares
that he already owns, having a value equal to the amount required to be
withheld. The value of Shares to be withheld, or delivered to Southwest, shall
be based on the Market Value of the Shares on the date the amount of tax to be
withheld is to be determined. As an alternative, Southwest may retain, or sell
without notice, a number of such Shares sufficient to cover the amount required
to be withheld.


         21. No Employment or Other Rights.

         In no event shall an Employee's eligibility to participate or
participation in the Plan create or be deemed to create any legal or equitable
right of the Employee or any other party to continue service with Southwest,
Stillwater National, or any Affiliate of such corporations. No Employee shall
have a right to be granted an Award or, having received an Award, the right to
again be granted an Award. However, an Employee who has been granted an Award
may, if otherwise eligible, be granted an additional Award or Awards.


         22. Governing Law.

         The Plan shall be governed by and construed in accordance with the laws
of the State of Oklahoma, except to the extent that federal law shall be deemed
to apply.


         23. Successors and Assigns. The Plan shall be binding upon the
Company's successors and assigns.

                                      * * *
<PAGE>
 
REVOCABLE PROXY
                             SOUTHWEST BANCORP, INC.
                             -----------------------

                         ANNUAL MEETING OF STOCKHOLDERS
                                  May 27, 1999
                         ------------------------------

     The undersigned hereby appoints Joyce P. Berry, Joe Berry Cannon and Robert
L. Hert, with full powers of substitution to act, as attorneys and proxies for
the undersigned, to vote all shares of Common Stock of the Company which the
undersigned is entitled to vote at the Annual Meeting of Stockholders (the
"Annual Meeting"), to be held in the Auditorium, Room 215, of the Stillwater
Public Library, 1107 South Duck Street, Stillwater, Oklahoma on Thursday, May
27, 1999 at 11:00 a.m., Central Time, and at any and all adjournments thereof,
as indicated below and in accordance with the determination of a majority of the
Board of Directors with respect to other matters which come before the Annual
Meeting.

                                                           FOR        WITHHOLD
                                                           ---        -------- 
     1.  The election as directors of all nominees
         listed below (except as marked to the
         contrary below).                                 ----          ----

               INSTRUCTION: To withhold your vote for any individual nominee,
               insert that nominee's name on the line provided below.


               -----------------------------------------------
    
               Unless contrary direction is given, the right is reserved in the
               sole discretion of the Board of Directors to distribute votes
               among some or all of the above nominees in a manner other than
               equally so as to elect as directors the maximum possible number
               of such nominees.

     The Board of Directors recommends a vote "FOR" each of the listed nominees.

2.   To approve the amendment to Southwest's Certificate   FOR AGAINST ABSTAIN 
     of Incorporation to increase the authorized common 
     stock from 10,000,000 shares to 20,000,000 shares,    ---   ---     ---
     and total authorized capital stock to 22,000,000 
     shares.

The Board of Directors recommends a vote "FOR" the proposed amendment.

3.   To approve the Southwest Bancorp 1999 Stock Option    FOR AGAINST ABSTAIN
     Plan                                                    
                                                           ---   ---     ---

The Board of Directors recommends a vote "FOR" approval of the 1999 Stock Option
Plan.


- --------------------------------------------------------------------------------
THIS PROXY WILL BE VOTED AS DIRECTED, BUT IF NO INSTRUCTIONS ARE SPECIFIED, THIS
PROXY WILL BE VOTED FOR EACH OF THE NOMINEES, FOR APPROVAL OF THE AMENDMENT TO
THE CERTIFICATE OF INCORPORATION, AND FOR THE 1999 STOCK OPTION PLAN. IF ANY
OTHER BUSINESS IS PRESENTED AT THE ANNUAL MEETING, THIS PROXY WILL BE VOTED BY
THOSE NAMED IN THIS PROXY IN ACCORDANCE WITH THE DETERMINATION OF A MAJORITY OF
THE BOARD OF DIRECTORS. AT THE PRESENT TIME, THE BOARD OF DIRECTORS KNOWS OF NO
OTHER BUSINESS TO BE PRESENTED AT THE ANNUAL MEETING. THIS PROXY CONFERS
DISCRETIONARY AUTHORITY ON THE HOLDERS THEREOF TO VOTE WITH RESPECT TO THE
ELECTION OF ANY PERSON AS DIRECTOR WHERE THE NOMINEE IS UNABLE TO SERVE OR FOR
GOOD CAUSE WILL NOT SERVE AND MATTERS INCIDENT TO THE CONDUCT OF THE ANNUAL
MEETING.
<PAGE>
 
                THIS PROXY IS SOLICITED BY THE BOARD OF DIRECTORS


     Should the undersigned be present and elect to vote at the Annual Meeting
or at any adjournment thereof and after notification to the Secretary of the
Company at the Annual Meeting of the stockholder's decision to terminate this
proxy, then the power of said attorneys and proxies shall be deemed terminated
and of no further force and effect. The undersigned hereby revokes any and all
proxies heretofore given with respect to the shares of Common Stock held of
record by the undersigned.

     The undersigned acknowledges receipt from the Company prior to the
execution of this proxy of a Notice of Annual Meeting, the Company's Proxy
Statement for the Annual Meeting and the 1998 Annual Report to Stockholders.

Dated:                    , 1999
      -------------------- 

- --------------------------------------    -------------------------------------
  PRINT NAME OF STOCKHOLDER                     PRINT NAME OF STOCKHOLDER


- --------------------------------------    -------------------------------------
   SIGNATURE OF STOCKHOLDER                      SIGNATURE OF STOCKHOLDER


Please sign exactly as your name appears on the envelope in which this card was
mailed. When signing as attorney, executor, administrator, trustee or guardian,
please give your full title. If shares are held jointly, each holder should
sign.

  [_]     Please check here if you plan
          to attend the Annual Meeting.

- --------------------------------------------------------------------------------
PLEASE COMPLETE, DATE, SIGN AND MAIL THIS PROXY PROMPTLY IN THE ENCLOSED
POSTAGE-PREPAID ENVELOPE.                                             
- --------------------------------------------------------------------------------


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