FINANCIAL STATEMENTS AND SUPPLEMENTAL SCHEDULE BOK Financial Thrift Plan for Salaried Employees As of December 31, 2005 and 2004, and for the Year Ended December 31, 2005 BOK Financial Thrift Plan for Salaried Employees Financial Statements and Supplemental Schedule As of December 31, 2005 and 2004, and for the Year Ended December 31, 2005 Contents Report of Independent Registered Public Accounting Firm..............1 Audited Financial Statements Statements of Net Assets Available for Benefits......................2 Statement of Changes in Net Assets Available for Benefits............3 Notes to Financial Statements........................................4 Supplemental Schedule Schedule H; Line 4i--Schedule of Assets (Held at End of Year)........11 1 Report of Independent Registered Public Accounting Firm The Plan Administrative Committee BOK Financial Thrift Plan for Salaried Employees We have audited the accompanying statements of net assets available for benefits of the BOK Financial Thrift Plan for Salaried Employees as of December 31, 2005 and 2004, and the related statement of changes in net assets available for benefits for the year ended December 31, 2005. These financial statements are the responsibility of the Plan's management. Our responsibility is to express an opinion on these financial statements based on our audits. We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. We were not engaged to perform an audit of the Plan's internal control over financial reporting. Our audit included consideration of internal control over financial reporting as a basis for designing audit procedures that are appropriate in the circumstances, but not for the purpose of expressing an opinion on the effectiveness of the Plan's internal control over financial reporting. Accordingly, we express no such opinion. An audit also includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion. In our opinion, the financial statements referred to above present fairly, in all material respects, the net assets available for benefits of the Plan at December 31, 2005 and 2004, and the changes in its net assets available for benefits for the year ended December 31, 2005, in conformity with U.S. generally accepted accounting principles. Our audits were performed for the purpose of forming an opinion on the financial statements taken as a whole. The accompanying supplemental schedule of assets (held at end of year) as of December 31, 2005, is presented for purposes of additional analysis and is not a required part of the financial statements but is supplementary information required by the Department of Labor's Rules and Regulations for Reporting and Disclosure under the Employee Retirement Income Security Act of 1974. This supplemental schedule is the responsibility of the Plan's management. The supplemental schedule has been subjected to the auditing procedures applied in our audits of the financial statements and, in our opinion, is fairly stated in all material respects in relation to the financial statements taken as a whole. /s/ Ernst & Young LLP Tulsa, Oklahoma June 29, 2006 2 BOK Financial Thrift Plan for Salaried Employees Statements of Net Assets Available for Benefits December 31 2005 2004 ----------------------------------------- Assets Investments: BOKF Common Stock $ 22,551,206 $ 22,556,065 American Performance Funds: Growth Equity Fund - 3,073,008 Cash Management Fund 5,547,193 5,667,853 Intermediate Bond Fund 6,999,242 7,581,527 SEI Stable Asset Fund 10,601,453 10,292,400 American Advantage International Equity Fund - 5,085,328 American Balanced Fund 3,975,819 3,575,620 Neuberger and Berman Genesis Trust Fund 22,626,711 19,232,148 Dodge and Cox Stock Fund 22,013,241 20,247,815 Vanguard Institutional Index 18,770,373 20,492,655 Goldman Sachs Growth Fund 322,749 116,173 American Growth Fund 5,608,011 623,682 Hotchkis and Wiley Midcap Value Fund 2,748,496 1,159,735 T Rowe Price New Horizons 769,431 189,464 American Beacon International Fund 5,956,149 - Self-directed common stocks 602,999 495,208 Self-directed registered investment companies 710,954 546,489 Self-directed bonds 15,118 - Bank of Oklahoma, N.A. Managed Allocation Portfolios (MAP): MAP Conservative Fund 309,197 - MAP Balanced Fund 1,213,603 - MAP Moderate Growth Fund 1,935,984 - MAP Growth Fund 2,522,252 - MAP Aggressive Growth Fund 1,035,640 - Participant loans 4,410,900 3,732,706 ----------------------------------------- Total investments 141,246,721 124,667,876 Cash 656,022 599,194 Accrued interest receivable 93,898 240,902 Due from broker 5,307 211,229 ----------------------------------------- Total assets 142,001,948 125,719,201 Liabilities Due to broker 628,042 728,626 Excess contributions payable 3,731 - ----------------------------------------- Total liabilities 631,773 728,626 ----------------------------------------- Net assets available for benefits $ 141,370,175 $ 124,990,575 ========================================= See accompanying notes. 3 BOK Financial Thrift Plan for Salaried Employees Statement of Changes in Net Assets Available for Benefits Year ended December 31, 2005 Additions Investment income: Interest and dividends $ 2,156,379 Net appreciation in fair value of investments 5,194,309 ---------------------- 7,350,688 Contributions: Participants 11,038,246 Employer 3,728,204 Rollovers 2,357,011 ---------------------- 17,123,461 ---------------------- Total additions 24,474,149 Deductions Benefit payments 7,951,665 Administrative expenses 7,086 Net transfers out of the Plan 135,798 ---------------------- 8,094,549 ---------------------- Net increase 16,379,600 Net assets available for benefits, at beginning of year 124,990,575 ---------------------- Net assets available for benefits, at end of year $ 141,370,175 ====================== See accompanying notes. 4 BOK Financial Thrift Plan for Salaried Employees Notes to Financial Statements December 31, 2005 1. Description of Plan The following description of the BOK Financial Thrift Plan for Salaried Employees (the Plan) provides only general information. Participants should refer to the Summary Plan Description or the Plan document for a more complete description of the Plan's provisions. General The Plan is a defined contribution plan covering all salaried employees of BOK Financial Corporation (BOKF) and its subsidiaries and affiliates (collectively, the Employer or Company) who have attained age 21 and who have completed at least one year of service (equivalent to 1,000 hours). Effective April 1, 2003, an eligible employee may enter the plan on the first day of the month following the date the employee is credited with one full month of service. Additionally, as of April 1, 2003, all new eligible employees are automatically enrolled in the Plan at a three percent contribution rate unless the employee designates on the enrollment form not to participate or to participate at another allowable contribution rate. The Plan is subject to the provisions of the Employee Retirement Income Security Act of 1974, as amended (ERISA). Contributions Participants may elect to contribute a percentage of their compensation up to the maximum allowable by federal regulation (as defined by the Plan) on a pre-tax basis pursuant to a salary reduction agreement filed with the Plan administrator. In addition, participants may make after-tax contributions which shall not exceed 5 percent of each participant's compensation, however, the combination of pre-tax and after-tax contributions cannot be more than the annual legal limit on the total amount that may be contributed to this type of plan (as defined by the plan). For participants who attained age 50 on or before December 31, 2005, such participants were allowed to make a pre-tax catch-up contribution of an additional $4,000 above the maximum allowable by federal regulation. Participants may elect investment in any of 12 mutual funds, the Bank of Oklahoma, N.A. Managed Allocation Portfolios (MAP), self-directed common stocks, bonds, or registered investment companies, and BOKF Common Stock. During 2005, the Employer authorized the following modifications to the investment selections available to participants: (a) removal of the American Performance Growth Equity Fund and (b) addition of the American Beacon International and MAP Funds. 5 BOK Financial Thrift Plan for Salaried Employees Notes to Financial Statements (continued) 1. Description of Plan (continued) The Employer contributes a matching contribution to the plan. The matching contribution may be made in cash or in shares of BOKF Common Stock. In 2005, the entire matching contribution of $3,728,204 was made in cash. For 2005, the Employer matching contribution ranged from $.40 to $1.00 for each dollar of the participant's contributions, up to five percent of compensation, based on each participant's years of service as follows: Years of Service Matching Percentage ------------------------------------------------ ------------------------------ Less than four years 40% At least four, but less than ten years 60% At least ten, but less than fifteen years 80% Fifteen or more years 100% The Employer may, at its sole discretion, make an additional discretionary contribution to the Plan. There was no discretionary contribution in 2005. Participant Accounts Each participant's account is credited with the participant's contribution and allocations of (a) the Employer's contribution and (b) Plan earnings and charged with administrative expenses, if applicable. Allocations are based on participant earnings or account balances, as defined by the Plan. The benefit to which a participant is entitled is the benefit that can be provided from the participant's vested account. Vesting Participants vest in Employer matching contributions based upon years of service, as defined by the Plan. Participants are 100 percent vested upon completion of five years of service and are immediately vested in their deferred (pre-tax) contributions, after-tax contributions, and the actual earnings thereon. 6 BOK Financial Thrift Plan for Salaried Employees Notes to Financial Statements (continued) 1. Description of Plan (continued) Loans Participants may borrow against their accounts in amounts of not less than $1,000 and not to exceed the lesser of $50,000 or 50 percent of the participant's vested account balance. Loans will bear interest based on the current banking prime rate when the loan is requested and may not exceed a five-year term, unless the proceeds are used to acquire the primary residence of the participant, in which case the maximum term may be 25 years. The loans are secured by the balances in the participant's account. Interest rates are based on the Chase prime rate and range from 4.00 percent to 13.00 percent at December 31, 2005. Repayment is made by payroll withholdings. Payment of Benefits A participant who terminated employment with a vested account balance less than $1,000 ($5,000 prior to March 28, 2005), excluding rollover contributions, will receive a lump-sum payment. If the participant has a vested balance which exceeds $1,000 ($5,000 prior to March 28, 2005), excluding rollover contributions, and has not elected payment to another eligible retirement plan in a direct rollover or to receive payment directly, the Plan will pay the distribution in a direct rollover to an individual retirement account designated by the Plan Administrator. In lieu of lump-sum payment, a participant who terminates employment after his or her 65th birthday or attaining age 50 and completing ten years of service, shall be entitled to elect monthly, quarterly, semiannual, or annual installment payments to be paid over a period not to exceed 10 years from the benefit commencement date. The installments may be accelerated at the direction of the participant. Forfeitures Forfeited balances of terminated participants' nonvested accounts are utilized to pay administrative costs or to reduce future Employer contributions. During 2005, forfeitures of $61,000 were used to reduce Employer matching contributions. Additionally, at December 31, 2005 and 2004 forfeitures outstanding that will be used to reduce future Employer matching contributions were $24,085 and $39,153, respectively. 7 BOK Financial Thrift Plan for Salaried Employees Notes to Financial Statements (continued) 1. Description of Plan (continued) Plan Termination The Employer expects to continue the Plan indefinitely. However, the Employer reserves the right to discontinue the Plan or to amend the Plan, in whole or in part, from time-to-time. In the event of Plan termination, participants will become 100 percent vested in their accounts. 2. Summary of Significant Accounting Policies Basis of Accounting The financial statements of the Plan are prepared on the accrual basis of accounting. Benefit payments are recorded when paid. Administrative Expenses The Employer pays all administrative expenses except for loan origination fees and fees related to self-directed common stocks and registered investment companies, which are paid by the participants. Investment Valuation and Income Recognition Shares of registered investment companies are valued at fair value based on published market prices, which represent the net asset value of shares held by the Plan at year-end. The BOKF Common Stock, other common stocks and bonds are valued at the quoted market price. The MAP fund values are obtained from the MAP annual audited financial statements. The MAP funds are reported at market value. Participant loans receivable are valued at their outstanding balances, which approximates fair value. Purchases and sales of securities are recorded on a trade-date basis. Dividend income is recorded on the ex-dividend date. Interest income is recorded on the accrual basis. Use of Estimates The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates. 8 BOK Financial Thrift Plan for Salaried Employees Notes to Financial Statements (continued) 2. Summary of Significant Accounting Policies (continued) Excess Contributions Payable In order to be in compliance with the nondiscrimination rules under the Internal Revenue Code (the Code), the Plan is required to return excess contributions to certain highly compensated employees. As of December 31, 2005, the Plan recorded a liability in the amount of $3,731. The amounts payable to participants as of December 31, 2005 will be refunded by December 31, 2006, as required by the Code. 3. Investments The Plan's investments are held by a bank-administered trust fund at Bank of Oklahoma, N.A. Trust Division (the Trustee). During 2005, the Plan's investments (including investments purchased and sold, as well as held during the year) appreciated (depreciated) in fair value as determined by quoted market prices for BOKF Common Stock and common stocks and published market prices for registered investment companies as follows: Net Appreciation (Depreciation) in Fair Value of Investments ----------------------- BOKF Common Stock $ (1,256,845) Registered investment companies 6,088,804 Self-directed common stocks (103,056) Self-directed registered investment companies 49,099 Self-directed bonds (5,082) Collective investment trusts 421,389 ----------------------- $ 5,194,309 ======================= The fair values of all individual investments, including those that represent five percent or more of the Plan's net assets, are separately identified in the statements of net assets available for benefits. 9 BOK Financial Thrift Plan for Salaried Employees Notes to Financial Statements (continued) 4. Income Tax Status The Plan has received a determination letter from the Internal Revenue Service (IRS) dated April 1, 2002, stating that the Plan is qualified under Section 401(a) of the the Code and, therefore, the related trust is exempt from taxation. Subsequent to determination by the IRS, the Plan was amended. Once qualified, the Plan is required to operate in conformity with the Code to maintain its qualification. The Plan administrator believes the Plan is being operated in compliance with the applicable requirements of the Code and, therefore, believes that the Plan, as amended, is qualified and the related trust is tax-exempt. 5. Reconciliation of Financial Statements to the Form 5500 The following reconciles net assets available for benefits per the financial statements to the Form 5500: December 31 2005 2004 --------------------- -------------------- Net assets available for benefits per the financial statements $ 141,370,175 $ 124,990,575 Less: Benefits payable (120,416) (497,611) --------------------- -------------------- Net assets available for benefits per the Form 5500 $ 141,249,759 $ 124,492,964 ===================== ==================== Year ended December 31, 2005 ------------------- Benefit payments per the financial statements $ 7,951,665 Add: benefits payable at end of year 120,416 Less: benefits payable at beginning of year (497,611) ------------------- Benefit payments to participants per the Form 5500 $ 7,574,470 =================== Amounts allocated to withdrawn participants are recorded on the Form 5500 for benefit payments that have been processed and approved for payment prior to year-end, but not yet paid. 10 BOK Financial Thrift Plan for Salaried Employees Notes to Financial Statements (continued) 6. Risks and Uncertainties The Plan invests in various investment securities. Investment securities are exposed to various risks such as interest rate, market and credit risks. Due to the level of risk associated with certain investment securities, it is at least reasonably possible that changes in the values of investment securities will occur in the near term and that such changes could materially affect participants' account balances and the amounts reported in the statements of net assets available for benefits. 7. Related Parties BOK Investment Advisors, Inc. (BOKIA), a wholly owned subsidiary of Bank of Oklahoma, N.A. (BOk), serves as investment advisor to American Performance Funds (AP Funds). AP Funds is a diversified, open-ended, investment company established in 1987 as a business trust under the Investment Act of 1940. BOk serves as custodian for AP Funds. Effective July 1, 2004, BOKIA began serving as the AP Funds administrator. BOK Financial offers the AP Funds products to customers and employees, in the ordinary course of business, through its brokerage and trading, employee benefit plan and trust services, as well as to the public. Additionally, a portion of the Plan's assets are invested in Company stock. Since the Company is the Plan Sponsor, investments involving Company stock qualify as party-in-interest transactions. All of these transactions are exempt from prohibited transaction rules. Effective January 1, 2005, the Plan was authorized to include Bank of Oklahoma, N.A. Managed Allocation Portfolio (MAP) Funds as investment options. The MAP Funds include five different managed funds designed to meet different risk tolerances and years to retirement. The portfolios are comprised of different asset classes, capitalizations and investment styles. BOKIA also serves as investment advisor to the MAP Funds. 8. Subsequent Event Effective April 1, 2006, the Company matching contribution changed as a result of modifications to both the Plan and the BOK Financial Pension Plan. The Company will begin matching participant contributions up to 6% of the employee's compensation. Additionally, the Employer match will range from $.50 to $2.00 for each dollar of the participant's contribution based on the participant's years of service. Matching contributions for the 2006 plan year are limited to a certain dollar amount (ranging from $6,050 to $22,550) based on the participant's year of service. The Company will also make a special contribution for participants making less than $40,000. This special contribution is $750 for participants making less than $30,000 and phases out for participants making $30,000 to $40,000. In addition to the contribution changes, the limit on after-tax contributions will change to 6% of the participant's compensation. Supplemental Schedule 11 BOK Financial Thrift Plan for Salaried Employees EIN: 73-0780382 Plan #: 002 Schedule H; Line 4i--Schedule of Assets (Held at End of Year) December 31, 2005 (c) (b) Description of Investments, (e) Identity of Issue, Including Maturity Date, Rate Current (a) Borrower, Lessor, or Similar Party of Interest, or Maturity Value Value ------------------------------------------------------------------------------------------------------------- * BOK Financial Corporation BOKF Common Stock $ 22,551,206 * American Performance Funds Cash Management Fund 5,547,193 Intermediate Bond Fund 6,999,242 SEI Funds Stable Asset Fund 10,601,453 American Balanced Fund 3,975,819 Neuberger and Berman Genesis Trust Fund 22,626,711 Dodge and Cox Stock Fund 22,013,241 Vanguard Institutional Index 18,770,373 Goldman Sachs Growth Fund Stock Fund 322,749 American Growth Fund Stock Fund 5,608,011 Hotchkis and Wiley Midcap Value Fund Stock Fund 2,748,496 T Rowe Price New Horizons Stock Fund 769,431 American Beacon International Fund 5,956,149 * Bank of Oklahoma, N.A. Managed Allocation Portfolio (MAP) MAP Conservative Fund 309,197 MAP Balanced Fund 1,213,603 MAP Moderate Growth Fund 1,935,984 MAP Growth Fund 2,522,252 MAP Aggressive Growth Fund 1,035,640 Self-directed common stocks, bonds and Common stocks and registered registered investment companies investment companies 1,329,071 * Participant loans Interest rates ranging from 4.00 percent to 13.00 percent 4,410,900 ---------------------- $ 141,246,721 ====================== *Indicates Party-in-interest to the Plan. Column (d) is not applicable as all investments are participant directed.