United States securities and exchange commission logo December 21, 2021 Steven E. Nell Director, Executive Vice President and Chief Financial Officer BOK Financial Corp Bank of Oklahoma Tower Boston Avenue at Second Street Tulsa, OK 74172 Re: BOK Financial Corp. Form 10-K for the Fiscal Year Ended December 31, 2020 Filed February 24, 2021 Form 10-Q for the Quarterly Period Ended September 30, 2021 Filed November 3, 2021 File No. 001-37811 Dear Mr. Nell: We have limited our review of your filings to the financial statements and related disclosures and have the following comments. In some of our comments, we may ask you to provide us with information so we may better understand your disclosure. Please respond to these comments within ten business days by providing the requested information or advise us as soon as possible when you will respond. If you do not believe our comments apply to your facts and circumstances, please tell us why in your response. After reviewing your response to these comments, we may have additional comments. Form 10-K for the Fiscal Year Ended December 31, 2020 Cover Page 1. We note that with the filing of your Form 8-A on June 24, 2016 your Commission File Number changed to 001-37811. Please represent to us that in all future periodic and current reports filed under the Exchange Act you will provide the correct file number. Steven E. Nell FirstName LastNameSteven E. Nell BOK Financial Corp Comapany21, December NameBOK 2021 Financial Corp December Page 2 21, 2021 Page 2 FirstName LastName Management's Discussion and Analysis of Financial Condition and Results of Operations Results of Operations Lines of Business, page 42 2. In the individual segment tables and accompanying narrative disclosures you present and discuss "net loans charged off," which appear to be the amounts of the provision for credit losses for the periods presented in your segment footnote. For example, the 2020 "net loans charged off" for your Commercial Banking business of $69,475,000 from the table on page 43 agrees with the provision for credit losses amount for this segment presented in Note 17 on page 140. Please represent to us that in future filings you will revise your lines of business tables and discussions to properly identify your provision or benefit for credit losses because charge-offs have a different connotation as you disclose in Note 4 and elsewhere. Form 10-Q for the Quarterly Period Ended September 30, 2021 Management's Discussion and Analysis of Financial Condition and Results of Operations, page 1 3. Please revise your disclosure in your future quarterly periodic filings to include a discussion of material changes in your results of operations on a year-to-date basis in addition to the quarterly basis you currently disclose. Refer to Regulation S-K, Item 303(c)(2)(i). In closing, we remind you that the company and its management are responsible for the accuracy and adequacy of their disclosures, notwithstanding any review, comments, action or absence of action by the staff. You may contact Rolf Sundwall at 202-551-3105 or Mark Brunhofer at 202-551-3638 with any questions. Sincerely, Division of Corporation Finance Office of Finance