BOK FINANCIAL CORP

At least annually, the Audit Committee reviews the Company's independent public accounting firm to decide whether to retain such firm on behalf of the Company. Ernst & Young LLP ("EY") has served as the Company’s independent auditor since the Company's inception on October 24, 1990. The Audit Committee has selected EY as our independent auditor for the fiscal year ending December 31, 2024.

When conducting its latest review of EY, the Audit Committee considered, among other factors:

•the professional qualifications of EY and that of the lead audit partner and other key engagement members relative to the current and ongoing needs of the Company;

•EY's historical and recent performance on the Company's audits, including the extent and quality of EY's communications with the Audit Committee;

•the appropriateness of EY's fees relative to both efficiency and audit quality;

•EY's independence policies and processes for maintaining EY's independence;

•EY's tenure as the Company's independent public accounting firm and its related depth of understanding of the Company's business, operations and systems and the Company's accounting policies and practices; and

•EY's capability, expertise and efficiency in handling the breadth and complexity of the Company's operations.

While we are not required to do so, the Company is submitting the selection of EY to serve as our independent auditor for the fiscal year ending December 31, 2024 for ratification, in order to ascertain the views of our shareholders on this appointment. If the selection is not ratified, the Audit Committee will reconsider its selection. Representatives of EY are expected to participate in the annual meeting, will be available to answer shareholder questions and will have the opportunity to make a statement if they desire to do so.