UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION

                              Washington, DC 20549

                                    FORM 8-K

                                 CURRENT REPORT
     Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

                Date of Report (Date of earliest event reported):
                                 March 12, 2007

                            BOK FINANCIAL CORPORATION

             (Exact name of registrant as specified in its charter)

         Oklahoma                       000-19341              73-1373454
(State or other jurisdiction           (Commission            (IRS Employer
     of incorporation)                 File Number)         Identification No.)

  Bank of Oklahoma Tower, Boston Avenue at Second Street, Tulsa, Oklahoma 74172
                    (Address of principal executive offices)

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

                                       N/A
          (Former name or former address, if changes since last report)

Check the appropriate box below if the Form 8-K filing is intended to
simultaneously satisfy the filing obligation of the registrant under any of the
following provisions:

|_| Written communications pursuant to Rule 425 under the Securities Act (17 CFR
230.425).

|_| Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR
240.14a-12).

|_| Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange
Act (17 CFR 240.14d-2(b)).

|_| Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange
Act (17 CFR 240.13e-4(c)).



                    INFORMATION TO BE INCLUDED IN THE REPORT

ITEM 1.01 - Entry Into a Material Definitive Agreement

       On March 9, 2007, BOK Financial Corporation ("BOKF") entered into an
agreement to acquire Worth Bancorporation, Inc. ("Worth") for $127 million in
cash by merging Worth with a wholly owned subsidiary of BOKF. The acquisition
will add approximately $390 million in total assets, $272 million in net loans,
$344 million in deposits and five locations in the Fort Worth, Texas market to
BOKF. The merger is subject to regulatory approval and satisfaction of a number
of conditions contained in the Merger Agreement. A copy of the press release
announcing the Merger Agreement is attached as Exhibit 99.1 and a copy of the
Merger Agreement is attached as Exhibit 99.2.

      The foregoing description of the transaction does not purport to be
complete and is qualified in its entirety by the Merger Agreement which is
incorporated herein by reference. The Merger Agreement has been included in this
Current Report on Form 8-K to provide investors and stockholders with
information regarding its terms. It is not intended to provide any other factual
information about Worth or its subsidiaries. The Merger Agreement contains
representations and warranties that the parties to the Merger Agreement made
solely for the benefit of each other. The assertions embodied in such
representations and warranties are qualified by information contained in a
confidential disclosure schedule that Worth delivered in connection with signing
the Merger Agreement.

ITEM 9.01. Financial Statements and Exhibits

      (d)   Exhibits

            99.1  Text of press  release  dated March 12,  2007,  BOK  Financial
                  Acquires  Worth  Bancorporation,  Inc. to Continue  Fort Worth
                  Expansion

            99.2  Merger Agreement Among BOK Financial Corporation,  BOKF Merger
                  Corporation  Number Twelve,  Worth  Bancorporation,  Inc., and
                  Worth National Bank dated March 9, 2007



                                    Signature

Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.

                                  BOK FINANCIAL CORPORATION


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

Date:  March 12, 2007