| | Credit Ratings | BOK FINANCIAL CORPORATION (NASDAQ - BOKF) | | Dates indicate date of last change of each rating. Please reference our latest ratings reports for more information. | |
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| Long-term Issuer | BBB+ (OS) 7/23/2009 | -
| A- (OS) 7/28/2008 | A (low) (OS) 9/5/2008 | | Short-term/Commercial Paper | -
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| F1 7/28/2008 | R-1 (low) (OS) 9/5/2008 | | Senior Unsecured | -
| A2 (ON) 3/12/2009 | -
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| Bank of Oklahoma, National Association | Long-term Issuer | A- (OS) 7/23/2009 | A1 (ON) 3/12/2009 | A- (OS) 7/28/2008 | -
| Subordinated Debt | BBB+ 7/23/2009 | A2 3/2/2007 | BBB+ 7/19/2007 | A (low) 8/23/2007 | Short-term/Commercial Paper | A-2 7/23/2009 | P-1 (ON) 3/12/2009 | F1 7/28/2008 | R-1 (low) 8/23/2007 | Certificate of Deposit | -
| A1 (ON) 3/12/2009 | A 7/19/2007 | A (OS) 8/23/2007 | Bank Individual | -
| B- 3/2/2007 | B 7/28/2008 | -
| | | | Ratings Watch Action Legend: (WP) Watch Positive, (WN) Watch Negative, (WU) Watch Uncertain, (WR) Watch Removed, (OP) Outlook Positive, (ON) Outlook Negative, (OS) Outlook Stable, (OD) Outlook Developing |
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