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For the transition period from _____________ to ______________                 

Commission File No. 0-19341

 (918) 588-6000

(Registrant’s telephone number, including area code)

Securities registered pursuant to Section 12 (b) of the Act:  None

Securities registered pursuant to Section 12 (g) of the Act:

Common stock, $0.00006 par value

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.  Yes  ý  No  ☐

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 (d) of the Act.  Yes  ¨  No  ý

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.       Yes  ý  No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Website, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter)during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files)Yes  ý  No  ¨

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.   ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company.  See definitions of “larger accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.  (Check one):

Large Accelerated Filer  ý     Accelerated filer  ¨ Non-accelerated filer ¨ Smaller reporting company  ☐ Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).    Yes ☐  No  ý

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report.  ☒

The aggregate market value of the registrant's common stock ("Common Stock") held by non-affiliates is approximately $1.8 billion (based on the June 30, 2020 closing price of Common Stock of $56.44 per share). As of January 31, 2021, there were 69,577,615 shares of Common Stock outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

Part III incorporates certain information by reference from the Registrant’s Proxy Statement for the 2021 Annual Meeting of Shareholders.

BOK Financial Corporation

Form 10-K

Year Ended December 31, 2020

Index

			Part I
Item 1			Business			1
Item 1A			Risk Factors			10
Item 1B			Unresolved Staff Comments			17
Item 2			Properties			17
Item 3			Legal Proceedings			17
Item 4			Mine Safety Disclosures			17
			Part II
Item 5			Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities			18
Item 6			Selected Financial Data			21
Item 7			Management's Discussion and Analysis of Financial Condition and Results of Operations			21
Item 7A			Quantitative and Qualitative Disclosures about Market Risk			74
Item 8			Financial Statements and Supplementary Data			82
Item 9			Changes In and Disagreements with Accountants on Accounting and Financial Disclosure			163
Item 9A			Controls and Procedures			163
Item 9B			Other Information			163
			Part III
Item 10			Directors, Executive Officers and Corporate Governance			163
Item 11			Executive Compensation			163
Item 12			Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters			164
Item 13			Certain Relationships and Related Transactions, and Director Independence			164
Item 14			Principal Accounting Fees and Services			164
			Part IV
Item 15			Exhibits, Financial Statement Schedules			164
			Signatures			167
Exhibit 21			Subsidiaries of the Registrant
Exhibit 23			Consent of Independent Registered Public Accounting Firm
Exhibit 31.1			Chief Executive Officer Section 302 Certification
Exhibit 31.2			Chief Financial Officer Section 302 Certification
Exhibit 32			Section 906 Certifications