Southwest Bancorp (OKSB)

QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Southwest’s net income is largely dependent on its net interest income. Southwest seeks to maximize its net interest margin within an acceptable level of interest rate risk. Interest rate risk can be defined as the amount of forecasted net interest income that may be gained or lost due to favorable or unfavorable movements in interest rates. Interest rate risk, or sensitivity, arises when the maturity or repricing characteristics of assets differ significantly from the maturity or repricing characteristics of liabilities. Net interest income is also affected by changes in the portion of interest-earning assets that are funded by interest-bearing liabilities rather than by other sources of funds, such as noninterest-bearing deposits and shareholders’ equity.

Southwest attempts to manage interest rate risk while enhancing net interest margin by adjusting its asset/liability position. At times, depending on the level of general interest rates, the relationship between long-term and other interest rates, market conditions and competitive factors, Southwest may determine to increase its interest rate risk position in order to increase its net interest margin. Southwest monitors interest rate risk and adjusts the composition of its rate-sensitive assets and liabilities in order to limit its exposure to changes in interest rates on net interest income over time. Southwest’s asset/liability committee reviews its interest rate risk position and profitability, and recommends adjustments. The asset/liability committee also reviews the securities portfolio, formulates investment strategies, and oversees the timing and implementation of transactions. Notwithstanding Southwest’s interest rate risk management activities, the actual magnitude, direction, and relationship of future interest rates are uncertain, and can have adverse effects on net income and liquidity.

A principal objective of Southwest’s asset/liability management effort is to balance the various factors that generate interest rate risk, thereby maintaining the interest rate sensitivity of Southwest within acceptable risk levels. To measure its interest rate sensitivity position, Southwest utilizes a simulation model that facilitates the forecasting of net interest income over the next twelve month period under a variety of interest rate and growth scenarios.

The earnings simulation model uses numerous assumptions regarding the effect of changes in interest rates on the timing and extent of repricing characteristics, future cash flows, and customer behavior. These assumptions are inherently uncertain and, as a result, the model cannot precisely estimate net income. Actual results differ from simulated results due to timing, cash flows, magnitude, and frequency of interest rate changes and changes in market conditions and management strategies, among other factors.

The balance sheet is subject to quarterly testing for six alternative interest rate shock possibilities to indicate the inherent interest rate risk. Average interest rates are shocked by +/- 100, 200, and 300 basis points (“bp”), although Southwest may elect not to use particular scenarios that it determines are impractical in a current rate environment. It is management’s goal to structure the balance sheet so that net interest earnings at risk over a twelve-month period and the economic value of equity at risk do not exceed policy guidelines at the various interest rate shock levels.

Measures of net interest income at risk produced by simulation analysis are indicators of an institution’s short-term performance in alternative rate environments. These measures are typically based upon a relatively brief period, usually one year. They do not necessarily indicate the long-term prospects or economic value of the institution.

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QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

See Note 7. “Derivative Instruments and Hedging Activities” to the Unaudited consolidated financial statements, above which is incorporated herein by reference. Management has determined that no additional disclosures are necessary to assess changes in information about market risk that have occurred since December 31, 2005.

QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

See Note 6. “Derivative Instruments and Hedging Activities” to the Unaudited consolidated financial statements, above which is incorporated herein by reference. Management has determined that no additional disclosures are necessary to assess changes in information about market risk that have occurred since December 31, 2005.