Company: BANFP
Filing Date: 2025-08-05
Form Type: S-8
Source: 0000950170-25-102929
Chunk: 0

Company: BANCFIRST CORP /OK/
Filing Date: 2025-08-05
Form: S-8
Chunk 0
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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-8 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 BANCFIRST CORPORATION (Exact name of Registrant as specified in its charter)

| OKLAHOMA                                                       |     | 73-1221379                          |
| (State or other jurisdiction of incorporation or organization) |     | -I.R.S. Employer Identification No. |
| 100 North Broadway Ave Oklahoma City, Oklahoma 73102           |     |                                     |
| (Address of principal executive offices, including zip code)   |     |                                     |

BancFirst Corporation Directors’ Deferred Stock Compensation Plan (Full title of the plan) David Harlow President and Chief Executive Officer BancFirst Corporation 100 North Broadway Ave Oklahoma City, Oklahoma 73102 (405) 270-1086 (Name, address, including zip code, and telephone number, including area code, of agents for service) COPIES TO: Roger A. Stong, Esq. Crowe & Dunlevy 324 North Robinson Avenue Suite 100 Oklahoma City, Oklahoma 73102 (405) 239-6614 Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

| Large accelerated filer |     | ☒ |     | 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 7(a)(2)(B) of the Securities Act. ☐

EXPLANATORY NOTE BancFirst Corporation (the “Registrant”) is filing this Registration Statement (i) to register an aggregate 25,901 additional shares of Common Stock, par value $1.00 per share (“Common Stock”) available for issuance under the BancFirst Corporation Directors’ Deferred Stock Compensation Plan