UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Fiscal Year Ended December 31, 2018 Commission File Number 0-14384 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.) 101 North Broadway, Oklahoma City, Oklahoma 73102 (Address of principal ...