As filed with the Securities and Exchange Commission on June 29, 2006
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549



                                   FORM 10-K/A

                                (Amendment No. 2)
 (Mark One)

|X|    ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE
       ACT OF 1934

        For the fiscal year ended December 31, 2005

                                       OR

|_|    TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
       EXCHANGE ACT OF 1934

        For the transition period from _____________ to ______________

                           Commission File No. 0-19341

                            BOK FINANCIAL CORPORATION
             (Exact name of registrant as specified in its charter)

                Oklahoma                                   73-1373454
      (State or other jurisdiction                       (IRS Employer
    of Incorporation or Organization)                 Identification No.)

         Bank of Oklahoma Tower
              P.O. Box 2300
             Tulsa, Oklahoma                                 74192
(Address of Principal Executive Offices)                   (Zip Code)

                                 (918) 588-6000
              (Registrant's telephone number, including area code)

          Securities registered pursuant to Section 12 (b) of the Act:
                                      None

          Securities registered pursuant to Section 12 (g) of the Act:
                        Common stock, $0.00006 par value

     Indicate by check mark if the registrant is a well-known  seasoned  issuer,
as defined in Rule 405 of the Securities Act. Yes |X| No |_|

     Indicate by check mark if the  registrant  is not  required to file reports
pursuant to Section 13 or Section 15 (d) of the Act. Yes |_| No |X|

     Indicate  by check mark  whether the  registrant  (1) has filed all reports
required to be filed by Section 13 or 15(d) of the  Securities  Exchange  Act of
1934  during  the  preceding  12 months  (or for such  shorter  period  that the
registrant was required to file such reports),  and (2) has been subject to such
filing requirements for the past 90 days. Yes |X| No |_|

     Indicate by check mark if disclosure of delinquent  filers pursuant to Item
405 of Regulation S-K is not contained herein, and will not be contained, to the
best of registrant's  knowledge,  in definitive proxy or information  statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K. |_|

     Indicate by check mark whether the registrant is a large accelerated filer,
an accelerated filer, or a non-accelerated filer. See definition of "accelerated
filer and large  accelerated  filer" in Rule 12b-2 of the Exchange  Act.  (Check
one):
Large accelerated filer |X| Accelerated  filer |_|  Non-accelerated  filer  |_|

     Indicate  by check mark  whether  the  registrant  is a shell  company  (as
defined in Rule 12b-2 of the Act). Yes |_| No |X|

     The  aggregate  market  value of the  registrant's  common  stock  ("Common
Stock") held by non-affiliates is approximately  $948,181,172 (based on the June
30, 2005  closing  price of Common  Stock of $46.12 per  share).  As of March 1,
2006, there were 66,955,508 shares of Common Stock outstanding.

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                                EXPLANATORY NOTE


     BOK Financial Corporation (the "Company") is filing this Amendment No. 2 on
Form  10-K/A to amend its Annual  Report on Form 10-K for the fiscal  year ended
December  31,  2005,  as  originally  filed  with the  Securities  and  Exchange
Commission (the  "Commission") on March 15, 2006 (the "Original Form 10-K").  On
June 8, 2006,  the  Company  filed  Amendment  No. 1 on Form 10-K/A for the sole
purpose of correcting a mistaken reference to the date of the reports of Ernst &
Young LLP as March 1, 2006 instead of March 10, 2006.

     On June 15, 2006, the Company received a second comment letter from the SEC
stating  that the revised  report of Ernst & Young LLP with the  corrected  date
could not be filed as a separate  exhibit.  Instead,  the Company was to re-file
the entire Annual  Report,  which  included the revised  report of Ernst & Young
LLP.  The  Company  was also  reminded  of the  requirement  to file new officer
certifications  pursuant  to Rule  12b-15 of the  Exchange  Act Rules.  The sole
purpose of this  Amendment No. 2 is to re-file the Company's  Annual Report with
the  corrected  Ernst &  Young  LLP  report  date  and to  provide  new  officer
certifications.  There are no changes to the Company's  financial  statements or
other Company  disclosures  contained in the Original Form 10-K. The Company has
not updated the financial statements or disclosures  contained herein to reflect
any events that occurred at a later date.

     The date  references in the Company's  Annual  Report to  Shareholders  are
correct as originally printed.


ITEM 8 - FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

     The  following   information  set  forth  in  the  2005  Annual  Report  is
incorporated  herein by reference:  the  Consolidated  Financial  Statements and
Notes  to  Consolidated  Financial  Statements  of  BOK  Financial  Corporation,
together  with the  report  thereon of Ernst & Young LLP dated  March 10,  2006,
which appears on page 37 of the 2005 Annual Report,  and the Selected  Quarterly
Financial Data in Table 5.

     This 2005 Annual Report has been revised  solely to reference a report date
of March 10,  2006  within the final  paragraph  of each report of Ernst & Young
LLP, instead of the previously referenced March 1, 2006.

     The date  references in the Company's  Annual  Report to  Shareholders  are
correct as originally printed.


ITEM 15 - EXHIBITS, FINANCIAL STATEMENT SCHEDULES

     Item 15  beginning  on page 17 of the  Annual  Report  on Form 10-K for the
fiscal year ended  December 31, 2005 is amended by  substituting  the  following
revised exhibits:

Exhibit 13.0  Annual Report to Shareholders for the fiscal year ended December
              31, 2005, filed herewith. Such report, except for those portions
              thereof which are expressly incorporated by reference in this
              filing, is furnished for the information of the Commission and
              is not deemed to be "filed" as part of this Annual Report on
              Form 10-K/A.

Exhibit 23.0  Consent of independent registered public accounting firm - Ernst
              & Young LLP, filed herewith.

Exhibit 31.1  Certification of Chief Executive Officer Pursuant to Section 302
              of the Sarbanes-Oxley Act of 2002, filed herewith.

Exhibit 31.2  Certification of Chief Financial Officer Pursuant to Section 302
              of the Sarbanes-Oxley Act of 2002, filed herewith.

Exhibit 32    Certification of Chief Executive Officer and Chief Financial
              Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant
              to Section 906 of the Sarbanes-Oxley Act of 2002, filed herewith.



                                   SIGNATURES

Pursuant to the  requirements of Section 13 or 15(d) of the Securities  Exchange
Act of 1934,  the  registrant  has duly  caused  this report to be signed on its
behalf by the undersigned, thereunto duly authorized.

                                               BOK FINANCIAL CORPORATION


DATE:    June 29, 2006                     BY:   /s/ Stanley A. Lybarger
       ------------------------------          --------------------------------
                                               Stanley A. Lybarger
                                               Director, President and Chief
                                               Executive Officer


                                                 /s/ Steven E. Nell
                                               --------------------------------
                                               Steven E. Nell
                                               Executive Vice President and
                                               Chief Financial Officer


                                                 /s/ John C. Morrow
                                               --------------------------------
                                               John C. Morrow
                                               Senior Vice President and
                                               Director of Financial Accounting
                                               and Reporting