4.0




                            BOK FINANCIAL CORPORATION



                             2000 STOCK OPTION PLAN



                                 OCTOBER 1, 1999





                  (Adopted by Action of the Board of Directors
                                       of
                BOK Financial Corporation taken October 26, 1999)




     On December 1, 1999, BOK Financial Corporation registered on Securities and
Exchange  Commission Form S-8 pursuant to the Securities Act of 1933,  1,800,000
shares of BOK  Financial  Corporation  Common  Stock,  $0.00006  par value,  for
issuance in  connection  with the BOKF 2000 Stock  Option  Plan.  This  document
constitutes part of a Section 10(a) Prospectus covering the securities that have
been registered under the Securities Act of 1933. The documents constituting the
Section 10(a)  Prospectus  are  held  in  a  file  maintained  by  the  Benefits
Department of Human  Resources and may be reviewed or obtained,  without charge,
upon  written  or oral  request  made to the  Compensation  Department  of Human
Resources  of Bank of Oklahoma,  National  Association,  P.O.  Box 2300,  Tulsa,
Oklahoma 74172, telephone number (918) 588-6277.

                                     - xi -



                           BOKF 2000 STOCK OPTION PLAN

SECTION 1.  ESTABLISHMENT, PURPOSE AND EFFECTIVE DATE OF PLAN.

          1.1  Establishment.  BOK Financial  Corporation (the  "Corporation" or
               "BOKF"),  an Oklahoma  corporation,  hereby establishes the "BOKF
               2000 Stock  Option  Plan" (the "BOKF 2000  Plan") for  designated
               employees of the  Corporation  and of various direct and indirect
               subsidiaries of the Corporation (collectively, "BOKF").

          1.2  Purpose.  The  purpose  of the BOKF 2000 Plan is to  advance  the
               interests of the Corporation (i) by encouraging and providing for
               the  acquisition of an equity  interest in the Corporation by key
               employees of BOKF and (ii) by enabling BOKF to attract and retain
               the  services of key  employees  whose  judgment,  interest,  and
               special  effort  are  desired  for  the  successful   conduct  of
               operations.

          1.3  Effective  Date.  The BOKF 2000 Plan shall  become  effective  on
               December  1,  1999  (or on  such  later  date  as a  registration
               statement  in  respect  of the BOKF 2000 Plan on  Securities  and
               Exchange Commission Form S-8 shall become effective).

SECTION 2. THE 2000 OPTION. The options ("2000 Options")  established hereby are
the right to purchase shares of Common Stock of the Corporation on the terms and
conditions  hereafter set forth in this and succeeding sections of the BOKF 2000
Plan:

          2.1  The Common Stock  subject to the 2000 Options shall be the Common
               Stock of the  Corporation,  par value  $0.00006  per share ("BOKF
               Common Stock").

          2.2  The  owners  of  the  2000  Options  shall  be  those   employees
               (hereafter  called a  "Participant")  to whom a  letter  of award
               ("Award  Letter") is  hereafter  delivered by the Chairman of the
               Board and the Chief  Executive  Officer of the  Corporation.  The
               Corporation  may  issue  Award  Letters  at  any  time  prior  to
               January 1, 2003.

                                      - i -


          2.3  The 2000  Options  owned by each  Participant  shall  entitle the
               Participant,  subject  to the terms  and  conditions  hereof,  to
               purchase  that number of shares of BOKF Common Stock set forth in
               one or more Award Letters  delivered to the Participant from time
               to time ("Participant's  2000 Option Shares").  Each Award Letter
               shall  bear the date on which  the Award  Letter  is issued  (the
               "Award  Date").  The total  number of shares of BOKF Common Stock
               subject to 2000 Options shall be 1,800,000.  If the employment of
               a Participant is terminated  for any reason and such  Participant
               has not  exercised  the 2000  Options with respect to any shares,
               the  Corporation may award 2000 Options in respect of such shares
               to existing Participants or to additional Participants by issuing
               additional Award Letters on or before January 1, 2003.

          2.4  The purchase price of shares subject to the 2000 Options shall be
               the average of the  mid-points  between the highest price and the
               lowest  price at which  trades  occurred  (or,  in the event of a
               single  trade,  the price of such trade) for BOKF Common Stock on
               NASDAQ on the five (5)  trading  days on which at least one trade
               actually  occurs  immediately  preceding  the  date of the  Award
               Letter (the "Option Price").

          2.5  The 2000 Options may be exercised in accordance with, and only in
               accordance with, the following schedule:

               2.5.1At any time and from time to time one  calendar  year  after
                    the Award Date and prior to four  calendar  years  after the
                    Award Date,  with  respect to one seventh  (1/7) of the 2000
                    Option Shares set forth in the Award Letter.

               2.5.2At any time and from time to time two  calendar  years after
                    the Award Date and prior to five  calendar  years  after the
                    Award Date,  with  respect to one seventh  (1/7) of the 2000
                    Option Shares set forth in the Award Letter.

                                     - ii -


               2.5.3At any time  and  from  time to time  three  calendar  years
                    after the Award Date and prior to six  calendar  years after
                    the Award Date,  with  respect to one  seventh  (1/7) of the
                    2000 Option Shares set forth in the Award Letter.

               2.5.4At any time and from time to time four calendar  years after
                    the Award Date and prior to seven  calendar  years after the
                    Award Date,  with  respect to one seventh  (1/7) of the 2000
                    Option Shares set forth in the Award Letter.

               2.5.5At any time and from time to time five calendar  years after
                    the Award Date and prior to eight  calendar  years after the
                    Award Date,  with  respect to one seventh  (1/7) of the 2000
                    Option Shares set forth in the Award Letter.

               2.5.6At any time and from time to time six  calendar  years after
                    the Award Date and prior to nine  calendar  years  after the
                    Award Date,  with  respect to one seventh  (1/7) of the 2000
                    Option Shares set forth in the Award Letter.

               2.5.7At any time  and  from  time to time  seven  calendar  years
                    after the Award Date and prior to ten  calendar  years after
                    the Award Date,  with  respect to one  seventh  (1/7) of the
                    2000 Option Shares set forth in the Award Letter.

          2.6  The  2000  Options  may be  exercised  only by  delivering  (i) a
               written  notice of exercise  (stating  the fact that 2000 Options
               are being  exercised,  the Award  Date,  and the number of shares
               being  purchased)  and (ii) payment in full of the purchase price
               of the shares being purchased to the  Compensation  Department of
               Human  Resources  of  Bank  of  Oklahoma,  National  Association.
               Payment shall be made (i) by personal  check of the  Participant,
               (ii) in cash or its equivalent,  or (iii) by tendering  shares of
               BOKF Common

                                     - iii -


               Stockhaving  a value  equal to the  purchase  price  based on the
               closing  price  quoted  for BOKF  Common  Stock on  NASDAQ on the
               trading day immediately preceding the date of exercise, or (iv) a
               combination of (i), (ii), or (iii).

          2.7  The Corporation shall deliver to the Participant the certificates
               representing the shares purchased pursuant to the exercise of the
               2000 Options within thirty (30) days of the date of exercise.

          2.8  BOKF Common  Stock  acquired  pursuant to the 2000 Options may be
               resold only pursuant to the provisions of Section 4 hereof.

SECTION 3. PROVISIONS  APPLICABLE TO THE 2000 OPTIONS. The following provi sions
shall  apply to the 2000  Options  and all BOKF  Common  Stock  issued  pursuant
thereto.

          3.1  Non-Transferability.   The   2000   Options   may  not  be  sold,
               transferred,   pledged,   assigned,  or  otherwise  alienated  or
               hypothecated,  otherwise  than by will or by the laws of  descent
               and distribution.

          3.2  Termination  of 2000 Options Upon  Termination  of  Employment of
               Participant.  If the employment of the  Participant by BOKF shall
               terminate for any reason including death, disability, retirement,
               resignation or involuntary  termination (whether such involuntary
               termination is with or without  cause),  the  Participant's  2000
               Options  shall  automatically   terminate,   to  the  extent  not
               previously exercised, provided:

               3.2.1The  Chairman of the Board and the Chief  Executive  Officer
                    may,  in their  sole  discretion  (which  discretion  may be
                    exercised  arbitrarily)  subject to approval of the Board of
                    Directors of the Corporation,  extend the termination of the
                    Participant's 2000 Options in special circumstances.

               3.2.2In  the  event  of  the   termination  of  employment  of  a
                    participant   by   reason  of  death  or   disability,   the
                    Participant

                                     - iv -


                    (or, in the event of death, the personal  representative  of
                    the  Participant) may purchase,  any of  Participant's  2000
                    Option  Shares  which  the  Participant  had  the  right  to
                    purchase immediately preceding the date of the Participant's
                    termination  of  employment  within  the period of time such
                    Participant could have, but for such termination,  purchased
                    such 2000 Option Shares.

               3.2.3In the event a  Participant's  employment  is  involuntarily
                    terminated by BOKF without cause  (determined  in accordance
                    with Section 3.2.5) and such involuntary termination without
                    cause is within one year of a Change of Control  (as defined
                    in  Section 3.2.4),  the  Participant  may purchase,  within
                    90 days  of the  date of the  Participant's  termination  of
                    employment,  all of Participant's 2000 Option Shares (to the
                    extent not previously purchased).

               3.2.4A Change of Control shall be deemed to have occurred if, and
                    only if:

                    3.2.4.1 George B.  Kaiser,  affiliates of George B.  Kaiser,
                         and/or  members  of  the  family  of  George B.  Kaiser
                         collectively  cease to own more  shares  of the  voting
                         capital  stock of BOKF than any other  shareholder  (or
                         group of shareholders acting in concert to control BOKF
                         to the  exclusion of George B.  Kaiser,  affiliates  of
                         George B. Kaiser, or members of the family of George B.
                         Kaiser); or,

                                      - v -


                    3.2.4.2 BOKF shall  cease to own more than 50% of the voting
                         capital   stock   of   Bank   of   Oklahoma,   National
                         Association.

               3.2.5A Participant  shall be deemed to have been  terminated  for
                    cause if the Board of Directors of BOKF  determines  (in its
                    sole  discretion  provided  only  that  such  discretion  is
                    exercised  with  honesty in fact) that the  Participant  was
                    terminated  by reason of (i) any  failure  to  substantially
                    perform  Participant's  employment  obligations to BOKF in a
                    satisfactory  manner,  (ii) any  intentional  act materially
                    injurious  to  BOKF,   (iii) any  act  of  moral  turpitude,
                    (iv) any  material  dishonest or fraudulent  act, or (v) any
                    refusal to obey orders or instructions of the  Participant's
                    appropriate supervisors or seniors.

               3.2.6A  Participant  shall be deemed  employed by BOKF so long as
                    and only so long as the employee is in the employment of BOK
                    Financial  Corporation or a direct or indirect subsidiary of
                    BOK Financial Corporation in which BOK Financial Corporation
                    owns,  directly  or  indirectly,  more  shares of the voting
                    capital  stock  than  any  other  shareholder  (or  group of
                    shareholders acting in concert to control such subsidiary to
                    the exclusion of BOKF).

          3.3  Adjustments.  If there are any changes in the  capitalization  of
               the   Corporation   affecting  the  number  or  kind  (after  the
               recapitalization) of issued and outstanding shares of BOKF Common
               Stock   (existing    immediately   prior   to   the   change   in
               capitalization),  whether such changes  have been  occasioned  by
               reorganization,  combination  of  shares,  declaration  of  stock
               dividends,

                                     - vi -


               stocksplits,    reverse   stock   splits,   reclassification   or
               recapitalization  of such stock,  the merger or  consolidation of
               the  Corporation  with some other  corporation  or other  similar
               transaction,  then the number and kind of shares then  subject to
               the 2000  Options  and the  price to be paid  therefor,  shall be
               appropriately  adjusted by the  Corporation;  provided,  however,
               that  in no  event  shall  any  such  adjustment  result  in  the
               Corporation being required to sell or issue a fractional share of
               stock.

          3.4  Waiver of  Shareholder  Rights.  The  Participant or other person
               entitled  to  exercise  2000  Options  shall  have no rights as a
               stockholder  with respect to any shares subject thereto until the
               Participant  or such person shall have exercised the 2000 Options
               and shall  thereafter  have  become  the holder of record of such
               shares  and no  adjustment  (except  such  adjustments  as may be
               effected  pursuant to the provisions of Section 3.3 hereof) shall
               be made for  dividends or  distributions  of rights in respect of
               such  shares  for which the  record  date is prior to the date on
               which the  Participant  or such  person so becomes  the holder of
               record.

SECTION 4. REOFFER OR RESALE OF BOKF STOCK ACQUIRED  PURSUANT TO EXERCISE OF THE
2000  OPTIONS.  The  reoffer  or  resale  of BOKF  Common  Stock  acquired  by a
Participant pursuant to the 2000 Options shall be subject to the following terms
and conditions:

          4.1  Reoffer  or  Resale  by  Affiliate.  If  the  Participant  is  an
               affiliate  of the  Corporation,  the  reoffer  or  resale of BOKF
               Common Stock may be made by the Participant  only (i) by means of
               a  reoffer  prospectus  pursuant  to  an  effective  registration
               statement on Form S-8 or (ii) in accordance  with the  provisions
               of SEC Rule 144 or (iii)  pursuant  to the  determination  of the
               Corporation's   general   counsel  that  there  is  an  available
               exemption under the federal and state securities laws.

                                     - vii -


          4.2  Reoffer or Resale by Non-Affiliate.  If the Participant is not an
               affiliate  of the  Corporation,  the  reoffer  or  resale  is not
               subject to  restriction,  except as set forth in  Section  4.3 of
               this BOKF 2000 Plan.

          4.3  Prior  Approval of Counsel.  Prior to reoffering or reselling any
               BOKF  Common  Stock  acquired  pursuant  to a  2000  Option,  the
               Participant  shall advise the  Compensation  Department  of Human
               Resources of Bank of Oklahoma,  National  Association which shall
               refer  the  matter  to the  Corporation's  general  counsel.  The
               Corporation's   general  counsel  shall  determine   whether  the
               Participant  is an affiliate or a  non-affiliate  of BOKF. If the
               Corporation's  general  counsel  determines   Participant  is  an
               affiliate,  the Participant  shall offer and sell the BOKF Common
               Stock only as provided by Section 4.1.

          4.4  Reoffer Prospectus. BOKF shall use its reasonable best efforts to
               provide any  Participant  who is an affiliate and desires to sell
               BOKF Common Stock with a reoffer prospectus at reasonable times.

SECTION 5. NOT AN EMPLOYMENT AGREEMENT. This BOKF 2000 Plan is not an employment
agreement.  Nothing contained herein shall be construed to limit or restrict the
right of BOKF to terminate the Participant's employment or services at any time,
with  or  without   cause,   or  to  increase  or  decrease  the   Participant's
compensation.

SECTION 6.  MISCELLANEOUS  PROVISIONS.  The following  miscellaneous  provisions
shall apply to the BOKF 2000 Plan:

          6.1  This  BOKF  2000  Plan is made  and  executed  in  Tulsa  County,
               Oklahoma.

          6.2  This BOKF 2000 Plan  shall be  subject  to,  and  interpreted  in
               accordance with, the laws of the State of Oklahoma.

          6.3  This  BOKF  2000  Plan is the  entire  agreement  of the  parties
               respecting  the  subject  matter  hereof.   There  are  no  other
               agreements,  whether  oral or  written,  respecting  the  subject
               matter hereof.

                                    - viii -


          6.4  Rights and  obligations  arising under the BOKF 2000 Plan may not
               be assigned.

SECTION 7.  ADDITIONAL INFORMATION.

          7.1  ERISA Not  Applicable.  The BOKF 2000 Plan is not  subject to the
               provisions of the Employee Retirement Income Security Act.

          7.2  No Reports to  Participants.  No reports  shall be required to be
               delivered  to  the   Participants  as  to  the  status  of  their
               participation in the BOKF 2000 Plan.  However,  a Participant may
               contact the Compensation Department of Human Resources of Bank of
               Oklahoma,  National Association to determine the number of shares
               unexercised  by the  Participant  under such  Participant's  2000
               Options and the last date on which such options may be exercised.

          7.3  Tax  Effects.   The  BOKF  2000  Plan  is  not  qualified   under
               Section 401(a)  at the Internal  Revenue Code. The tax effects of
               the BOKF 2000 Plan are:

               7.3.1BOKF will be entitled to an income tax deduction at the date
                    of exercise  of the 2000  Options by the  Participants.  The
                    amount of the deduction  will be equal to the spread between
                    the fair  market  value of the  option  stock (as  quoted by
                    NASDAQ) and the Option Price.

               7.3.2Participants  will recognize  income at the date of exercise
                    of the 2000  Options  in an  amount  equal to the  deduction
                    allowed  to  BOKF,  as  defined  in  Section 7.3.1.   Income
                    recognized  due to the  exercise  of a 2000  Option  will be
                    subject to withholding  and reported to the employee on form
                    W-2.  Participants will not be subject to any further income
                    recognition until a taxable transaction occurs involving the
                    purchased stock. The basis in the stock is equal to the fair
                    market value at the

                                     - ix -


                    date of exercise, and future transactions will be subject to
                    capital asset rules.

          7.4  Administration  of the BOKF 2000 Plan.  The Chairman of the Board
               and the Chief Executive Officer of BOKF shall designate  (subject
               to approval of the Board of Directors, acting by a vote of, or of
               a  committee  of two or more of the  Board of  Directors  of BOKF
               consisting of, members who are Non- Employee Directors within the
               meaning  of SEC Rule  16b-3(b)(3))  those  employees  of BOKF who
               shall be  Participants  and the number of shares  subject to each
               such  Participant's  2000  Options.  The  members of the Board of
               Directors of the Corporation  are elected by the  stockholders of
               the  Corporation.  The  Chairman  of  the  Board  and  the  Chief
               Executive Officer are elected by the Board of Directors.

          7.5  Eligibility to Participate. All employees of BOKF are eligible to
               be designated as Participants.  Participants  shall be designated
               based  upon  a  subjective   determination  of  the  present  and
               potential  contributions  of the  employee  to the success of the
               business of the Corporation.

          7.6  Shares to be Issued. The shares of BOKF Common Stock to be issued
               pursuant to the exercise of the 2000  Options  shall be shares of
               authorized but unissued Common Stock of the Corporation.

          7.7  No Liens or Charges. No lien or other charge may be placed on the
               2000 Options.

          7.8  Incorporation of Certain Documents by Reference.  The Corporation
               is  subject  to the  information  reporting  requirements  of the
               Securities  Exchange  Act of 1934 and, in  accordance  therewith,
               files  reports  and other  information  with the  Securities  and
               Exchange Commission (the  "Commission").  The following documents
               filed with the  Commission are  incorporated  in this part of the
               Section 10(a) Prospectus by reference:

                                      - x -


               7.8.1Registration  Statement  on  Form  S-1  and  the  Prospectus
                    included therein  (Registration  No. 33-40950),  as amended,
                    filed under the  Securities  Act of 1933 with the Commission
                    and declared effective on August 13, 1991.

               7.8.2Registration  Statement  on  Form  10  (Registration  No. 0-
                    19341),  filed under the Exchange  Act with the  Commission,
                    and subsequent amendments thereto filed on Form 8.

               7.8.3Information  Statement and Prospectus  Supplement filed with
                    the Commission on November 20, 1991,  under the Exchange Act
                    and also under the Securities Act of 1933.

               7.8.4Quarterly  Report on Form 10-Q for the  three  months  ended
                    March  31,  1999  filed  with the  Commission  for the First
                    Quarter, 1999 filed May 17, 1999.

               7.8.5Quarterly  Report on Form 10-Q for the  three  months  ended
                    June 30,  1999  filed  with the  Commission  for the  Second
                    Quarter, 1999 filed August 16, 1999.

               7.8.6The  description of BOKF's capital stock contained on page 2
                    in the  Registration  Statement  on  Form 10,  as amended by
                    filings   on   Form 8,   filed   under  the   Exchange   Act
                    (Registration  No. 0-19341),   including  any  amendment  or
                    report filed for the purpose of updating such description.

               7.8.71998 Annual Report on Form 10-K filed with the Commission on
                    March 22, 1999.

               Additionally, all documents subsequently filed by the Corporation
               pursuant  to   Sections 13(a),   13(c),  14,  and  15(d)  of  the
               Securities Exchange Act of

                                     - xi -


               1934,  prior to the filing of a  post-effective  amendment  which
               indicates  that all  securities  offered  have been sold or which
               deregisters all securities then remaining unsold, shall be deemed
               to be  incorporated by reference in this  Registration  statement
               and to be part thereof from the date of filing of such documents.
               All  documents  incorporated  by  reference  in this  part of the
               Section 10(a)  Prospectus and all other documents  required to be
               delivered to employees  pursuant to Rule 428(b) of the Securities
               Act of 1933 may be obtained, without charge, upon written or oral
               request to the Compensation Department of Human Resources of Bank
               of  Oklahoma, National   Association  at  P.O. Box  2300,  Tulsa,
               Oklahoma 74192,  telephone number (918) 588- 6547. Any additional
               information  about the BOKF 2000 Plan or its  administrators  may
               also be obtained by  contacting  the  Compensation  Department of
               Human Resources of Bank of Oklahoma, National Association.




                          Adopted by action of the Board of Directors of BOKF
                          Financial Corporation taken October 26, 1999.

                                    /s/ Frederic Dorwart
                                    Frederic Dorwart, Secretary to the Board