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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549

## FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): November 13, 2025

BancFirst Corporation

(Exact name of Registrant as Specified in Its Charter)

Oklahoma | 0-14384 | 73-1221379
(State or Other Jurisdiction of Incorporation) | (Commission File Number) | (IRS Employer Identification No.)
100 N. Broadway Ave. |
Oklahoma City, Oklahoma |  | 73102-8405
(Address of Principal Executive Offices) |  | (Zip Code)

Registrant’s Telephone Number, Including Area Code: 405 270-1086

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

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

Title of each class |  | Trading Symbol(s) |  | Name of each exchange on which registered
Common Stock, $1.00 Par Value Per Share |  | BANF |  | Nasdaq Global Select Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

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. ☐

## Item 7.01 Regulation FD Disclosure.

BancFirst Corporation Issues Sustainability Report

On November 13, 2025, BancFirst Corporation issued a Sustainability Report as of November 2025. This report provides a comprehensive review of how BancFirst Corporation is addressing sustainability, including ESG and other matters important to our business, as well as to our various stakeholders and the communities we serve. The report is also available on the Company's investor relations website at www.bancfirst.bank.

## Item 9.01 Financial Statements and Exhibits.

(d) | Exhibits
Exhibit No. | Description
99.1 | BancFirst Corporation Sustainability Report.
104 | Cover Page Interactive Data File (embedded within the inline XBRL document).

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

|  |  | BANCFIRST CORPORATION
Date: | November 13, 2025 | By: | /s/ Hannah Andrus
|  |  | Hannah Andrus Executive Vice President Chief Financial Officer